UNITED STATES PATENT AND TRADEMARK OFFICE
`
`BEFORE THE PATENT TRIAL AND APPEAL BOARD
`
`GORDON * HOWARD ASSOCIATES, INC.
`Petitioner
`
`v.
`
`LUNAREYE, INC.
`Patent Owner
`
`
`
`
`
`
`
`
`
`
`
`
`
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`
`
`______________________________________________________
`
`INTER PARTES REVIEW OF U.S. PATENT NO. 6,484,035
`CASE NO. IPR2014-01213
`______________________________________________________
`
`
`
`Before MICHAEL W. KIM, GEORGIANNA W. BRADEN, and
`J. JOHN LEE, Administrative Patent Judges.
`
`
`
`
`
`
`
`LUNAREY EXHIBIT 2022
`
`
`
`LUNAREYE EXHIBIT 2022
`
`
`
`BEFORE THE PATENT TRIAL AND APPEAL BOARD
`
`GORDON * HOWARD ASSOCIATES, INC.
`Petitioner
`
`v.
`
`LUNAREYE, INC.
`Patent Owner
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`______________________________________________________
`
`INTER PARTES REVIEW OF U.S. PATENT NO. 6,484,035
`CASE NO. IPR2014-01213
`______________________________________________________
`
`
`
`Before MICHAEL W. KIM, GEORGIANNA W. BRADEN, and
`J. JOHN LEE, Administrative Patent Judges.
`
`
`
`
`
`
`
`LUNAREY EXHIBIT 2022
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`LUNAREYE EXHIBIT 2022
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`
`
`PCT
`WORLD INTELLECTUAL PROPERTY ORGANIZATION
`International Bureau
`INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`WO 95/27927
`
`(11) International Publication Number:
`
`(51) International Patent Classification 6:
`G04C 11/02
`
`Al
`
`( 43) International Publication Date:
`
`19 October 1995 (19.10.95)
`
`(21) International Application Number:
`
`PCTIUS95/04409
`
`(22) International Filing Date:
`
`7 April 1995 (07.04.95)
`
`(81) Designated States: AU, CA, JP, European patent (AT, BE,
`CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT,
`SE).
`
`Published
`With international search report.
`Before the expiration of the time limit for amending the
`claims and to be republished in the event of the receipt of
`amendments.
`
`(30) Priority Data:
`08/224,865
`
`8 April 1994 (08.04.94)
`
`us
`
`(71) Applicant: CELESTIAL TIME, INC. [US/US]; Bredimus,
`Frank, B., Market Station, 203-Q Harrison Street, S.E.,
`Leesburg, VA 22075 (US).
`
`(72) Inventor: WEIKEL, Gary; 6533 Jay Miller Drive, Falls
`Church, VA 22041 (US).
`
`(74) Agents: KINBERG, Robert et al.; Spencer, Frank & Schneider,
`Suite 300 East, 1100 New York Avenue, N.W., Washington,
`DC 20005-3955 (US).
`
`(54) Title: SATELLITE CONTROLLED TIMEPIECE
`
`IZ-
`
`1\
`
`(57) Abstract
`
`A timepiece (10) according to the invention includes a receiver (101) for receiving a radio signal having time and position data, a
`memory (103) for storing time zone data corresponding to at least one world time zone, a processor (102) for generating local time based
`on the received time and position data and the time zone data stored in memory, and a display (12) for displaying the generated local time.
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`LUNAREYE EXHIBIT 2015
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`•
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`FOR THE PURPOSES OF INFORMATION ONLY
`
`Codes used to identify States party to the PCT on the front pages of pamphlets publishing international
`applications under the PCT.
`
`AT
`AU
`BB
`BE
`BF
`BG
`BJ
`BR
`BY
`CA
`CF
`CG
`CH
`CI
`CM
`CN
`cs
`cz
`DE
`DK
`ES
`FI
`FR
`GA
`
`Austria
`Australia
`Barbados
`Belgium
`Burkina Paso
`Bulgaria
`Benin
`Brazil
`Belarus
`Canada
`Central African Republic
`Congo
`Switzerland
`Cllte d'Ivoire
`Cameroon
`China
`Czechoslovakia
`Czech Republic
`Germany
`Denmark
`Spain
`Finland
`France
`Gabon
`
`GB
`GE
`GN
`GR
`HU
`IE
`IT
`JP
`KE
`KG
`KP
`
`KR
`KZ
`LI
`LK
`LU
`LV
`MC
`MD
`MG
`ML
`MN
`
`United Kingdom
`Georgia
`Guinea
`Greece
`Hungary
`Ireland
`Italy
`Japan
`Kenya
`Kyrgystan
`Democratic People's Republic
`of Korea
`Republic of Korea
`Kazakhstan
`Liechtenstein
`Sri Lanka
`Luxembourg
`Latvia
`Monaco
`Republic of Moldova
`Madagascar
`Mali
`Mongolia
`
`MR
`MW
`NE
`NL
`NO
`NZ
`PL
`PT
`RO
`RU
`SD
`SE
`SI
`SK
`SN
`TD
`TG
`TJ
`TT
`UA
`us
`uz
`VN
`
`Mauritania
`Malawi
`Niger
`Netherlands
`Norway
`New Zealand
`Poland
`Portugal
`Romania
`Russian Federation
`Sudan
`Sweden
`Slovenia
`Slovakia
`Senegal
`Chad
`Togo
`Tajikistan
`Trinidad and Tobago
`Ukraine
`United States of America
`Uzbekistan
`VietNam
`
`LUNAREYE EXHIBIT 2015
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`PCTIUS95/04409
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`1
`
`SATELLITE CONTROLLED TIMEPIECE
`
`BACKGROUND OF THE INVENTION
`
`FIELD OF THE INVENTION
`
`The present invention relates to an electronic
`
`timepiece, or watch. More particularly, the present
`
`5
`
`invention relates to an electronic timepiece, or watch,
`
`which updates displayed time information based on
`
`received satellite signals for providing an accurate
`
`display of local time as the timepiece moves from time
`
`zone to time zone.
`
`10 DESCRIPTION OF THE RELATED ART
`
`Previously, when a user of a timepiece moved into
`
`a new time zone and wanted to know the new local time
`
`accurately, the user was forced to either manually
`
`update the time displayed by the timepiece by resetting
`
`15
`
`the timepiece, or by mentally compensating the time
`
`displayed by the timepiece for the local time of the
`
`new time zone.
`One solution to this problem, disclosed in u.s.
`Patent No. 4,316,272 to Naito, provides an electronic
`
`20
`
`timepiece with a global time zone display. With the
`
`Naito timepiece, a user can select a local time mode in
`
`which the time display is representative of a single
`
`selected time zone. By operating a select button, the
`
`local time mode can be changed to a world time mode.
`
`25
`
`In the world time mode, time information is displayed
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`by manually indexing to any one of the global time
`
`zones, or by automatically indexing to a predetermined
`
`time zone. When a user enters a different time zone
`
`with this timepiece, the world time mode may be
`
`5 selected and the timepiece manually indexed to display
`
`the local time in the new time zone, or the local time
`
`of the timepiece can be reset to the time of the new
`
`time zone.
`
`Another solution to this problem, disclosed in
`10 u.s. Patent No. 4,347,594 to Tschanz, is a watch which
`allows a user to manually rotate the body of the watch
`
`to display local time of a new time zone. The Tschanz
`watch includes a single watch hand attached to the body
`of the watch in a normal rotary manner for indicating
`
`15 hours. To display time in a new or in a different time
`
`zone, the body of the watch is manually rotated an
`
`amount corresponding to the new or different time zone.
`
`After the body of the watch has been rotated, the time
`
`displayed is determined by the position of the watch
`
`20 hand which has been rotated accordingly to correspond
`
`to the new time zone when the body was rotated.
`
`Both of these approaches are inconvenient because
`
`a user must manually reset or adjust the display of a
`
`timepiece or watch for accurately displaying local time
`
`25 when a new time zone is entered. Frequently, a user
`
`forgets to do this or incorrectly resets the time.
`
`Thus, there is a need to provide a convenient way
`
`for accurately and automatically resetting a timepiece
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`or watch not requiring user intervention for displaying
`
`local time whenever a new time zone is entered.
`
`SUMMARY OF THE INVENTION
`
`It is an object of the present invention to
`
`5 provide a timepiece that conveniently and automatically
`
`provides an accurate display of local time as it moves
`
`from time zone to time zone throughout the world so
`
`that a user is not required to manually reset the
`
`displayed time to the current local time or mentally
`
`10
`
`compensate a displayed time for a local time when
`
`traveling.
`
`These and other objects and advantages of the
`
`present invention are achieved by a timepiece which
`
`includes a receiver for receiving a radio signal having
`
`15
`
`time and position data, a memory for storing time zone
`
`data corresponding to a plurality of world time zones,
`
`a processor which is coupled to the receiver and the
`
`memory for generating a local time based on the
`
`received time and position data and the time zone data
`
`20
`
`stored in the memory, and a display which is coupled to
`
`the processor for displaying the local time generated
`
`by the processor. Preferably the radio signal is
`
`transmitted by a constellation of satellites providing
`
`global positioning information.
`
`25
`
`The memory of the present invention preferably
`
`includes time zone data for all world time zones which
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`has been partitioned in an arrangement based on boun(cid:173)
`
`daries of countries and on latitudinal and longitudinal
`
`data corresponding to the world time zones. Cyclical
`
`and seasonal time zone data, such as that corresponding
`
`5
`
`to Daylight Savings Time, may also be included in the
`
`time zone data base.
`
`The timepiece according to the present invention
`
`further includes an internal crystal-based source which
`
`is coupled to the processor so that the present
`
`10
`
`invention can automatically provide a crystal-based
`
`time to the processor for generating the local time
`
`when the received time and position data is determined
`
`to be invalid by the processor. The present invention
`
`automatically returns to displaying local time based on
`
`15
`
`the received time and position data when the time and
`
`position data is determined to again be valid.
`
`Preferably, the display provides an indication when the
`
`received time and position data is valid.
`
`Another feature of the present invention is that
`
`20
`
`the processor generates position information based on
`
`the received time and position data and the position
`
`information is displayed by the timepiece display.
`
`According to a further aspect of the invention,
`
`the inventive timepiece includes a battery for
`
`25
`
`supplying electrical energy, a solar panel for convert(cid:173)
`
`ing solar energy to electrical energy, and a power
`
`supply logic circuit for selecting between the battery
`
`and the solar panel as a source of electrical energy
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`and for determining whether available power exceeds a
`
`minimum threshold necessary for activating satellite
`
`signal reception and processing functions.
`
`Insufficient electrical power for activating satellite
`
`5 signal reception will cause the timepiece to display
`
`crystal-based time. Desirably, an indication is
`
`provided on the display for visually indicating that
`
`the solar panel is selected as the source of electrical
`
`energy.
`
`10
`
`The present invention also provides a method for
`
`generating local time of a timepiece comprising the
`
`steps of receiving a radio signal including time and
`
`position information, generating a local position of
`
`the timepiece from the received time and position
`
`15
`
`information, comparing the local position to time zone
`
`data stored in a memory of the time piece, generating a
`
`local time of the timepiece based on the local position
`
`of the time piece and the time zone data stored in the
`
`memory, and displaying the local time of the timepiece.
`
`20 Preferably, the time zone data stored in the memory
`
`includes time zone data for all world time zones.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The various objects of the present invention,
`
`together with other advantages and benefits which may
`
`25 be attained by its use, will become more apparent in
`
`view of the following detailed description of the
`
`invention taken in conjunction with the drawings.
`
`In
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`the drawings, wherein like reference numerals identify
`
`corresponding portions of the various embodiments of
`
`the timepiece of the present invention:
`
`Figure 1 is a diagram which shows the principle of
`s operation of the present invention which employs a
`
`constellation of global positioning system satellites;
`
`Figure 2 is a top view of a timepiece;watch face
`
`according to one embodiment of the present invention;
`
`Figure 3 shows a block circuit diagram of an
`
`10 embodiment of the electronics of a timepiece according
`
`to the invention;
`
`Figure 4 is a table which shows a portion of an
`
`exemplary time zone data base partitioned by latitude
`
`and longitude for determining time zones and for
`
`15 generating accurate local time according to the present
`
`invention;
`
`Figures 5a and 5b show a flow diagram for
`
`automatically changing between a primary and a backup
`
`mode of operation for generating accurate local time
`
`20 according to the invention;
`
`Figure 6 shows a flow diagram for manually setting
`
`the initial parameters of time, time zone, date and for
`
`enabling/ disabling the primary mode of operation
`
`according to the present invention; and
`
`25
`
`Figure 7 is a top view of a timepiece/watch face
`
`showing displayed position data according to one
`
`embodiment of the present invention.
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`
`DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
`
`The present invention is directed to an electronic
`timepiece or watch having a time display which is based
`
`5
`
`upon time and position information transmitted as a
`radio signal by a satellite global positioning system.
`As the timepiece according to the present invention
`
`physically moves from time zone to time zone, the
`displayed time is automatically and accurately updated
`
`to the local time of a new time zone without a user
`
`10
`
`15
`
`intervening to manually reset the time.
`In a preferred embodiment, the present invention
`receives time and position information transmitted by
`the Navigation Satellite Time and Ranging Global
`Positioning system (NAVSTAR GPS). Thus, the present
`invention provides an accurate time display anywhers in
`the world based on the time and position information
`received from the GPS satellites, and which is
`
`traceable to the National Bureau of Standards. Other
`global positioning systems which transmit time and
`
`20 position information as a radio signal may also be used
`to provide an accurate local time display according to
`
`the present invention.
`
`Figure 1 shows the principle of operation of the
`
`present invention employing GPS satellites. GPS space
`25 vehicles (SVs) 21 arranged in a constellation provide
`continuous earth coverage and transmit ranging codes
`
`and system data as radio signals needed for
`
`accomplishing a GPS navigational function. The
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`timepiece 10 according to the present invention uses
`
`time, latitudinal, and longitudinal information
`
`received from the GPS satellites for providing a time
`
`display. The default time display of the present
`
`5
`
`invention includes the current time, day, month and
`
`year for Greenwich Mean Time (GMT), also referred to
`
`sometimes as Universal Coordinated Time (UTC).
`
`However, the present invention converts the received
`
`(default) time to local time for the convenience of a
`
`10 user. This is accomplished by using the latitude and
`
`longitude of the timepiece as determined from time and
`
`position data received from the GPS satellites and
`
`comparing this position with a time zone data base
`
`contained within the timepiece to provide a time zone
`
`15 number used for generating local time. The time zone
`
`number is an offset in one-half hour increments which
`
`is added (subtracted) to (from) the default UTC time
`
`for generating a local time. According to the
`
`invention, the time zone number can also account for
`
`20 cyclical or seasonal time zone adjustments, such as
`
`Daylight savings Time.
`
`Figure 2 shows the face of a timepiece/watch which
`
`may be used to display time generated according to the
`
`present invention. Timepiece 10 includes a body 11
`
`25 having a display 12, a mode switch 13, a set switch 14,
`
`and a watchband 15. Display 12, preferably an electro(cid:173)
`
`optical liquid crystal display (LCD) type display,
`
`includes a time display portion 16, a date display
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`portion 17, and a valid data display portion 18. A
`
`solar power display portion 19 is included in display
`
`12 when timepiece 10 is equipped with a solar panel 20.
`
`Although Figure 2 shows that solar panel 20 is separate
`
`5
`
`from display 12, panel 20 can be incorporated into the
`
`face of display 12 thus permitting a smaller timepiece
`
`body. While the timepiece of the present invention is
`
`shown configured as a watch in Figure 2, the invention
`
`may be configured by other types of timepieces such as
`
`10
`
`a pocket watch or a travel alarm clock, or other
`
`devices having timekeeping features such as a
`
`calculator or an electronic calendarjnotepad.
`
`Figure 3 shows a block circuit diagram of the
`
`electronics of a timepiece according to the invention.
`
`15 An operator in line-of-sight with the GPS satellites
`
`receives an RF signal from two or more satellites via a
`
`ceramic patch aperture antenna 100. Antenna 100 is
`
`miniaturized to conform to the shape of watchband 15 or
`
`to body 11 (Figure 2) and can be any of a number of
`
`20 different well-known types of antennas suitable for
`
`receiving GPS signals. Antenna 100 feeds data signals
`
`received from the satellites to a GPS receiver 101 of
`
`known design which is miniaturized by techniques known
`
`by those skilled in the art of semiconductor
`
`25 electronics for decoding the data signals. Examples of
`
`commercially available devices which can be used for
`
`GPS receiver 101 are the Canadian-Marconi 11microGPS",
`
`devices from the GEC-Plessey "GP 1010/1020" family, the
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`Motorola "VP Oncore", the Rockwell International
`
`"Norcard" and "MicroTracker", or equivalent.
`
`GPS receiver 101 outputs a data stream in a
`
`standard format, such as a GPS Gold format which is
`
`5 detailed in ARINC Research Corporation Document ICD(cid:173)
`
`DPS-200, "Navstar GPS Space Segment/Navigation User
`
`Interfaces" and incorporated by reference herein. GPS
`
`receiver 101 can be a commercially available integrated
`
`circuit for receiving and decoding GPS data or, an
`
`10 application specific integrated circuit (ASIC)
`
`performing the same functions.
`
`Processor 102, in a known manner, extracts
`
`information from the data stream for determining UTC
`
`time, the latitude and longitude of the timepiece, and
`
`15 whether the data is valid. The extracted data is us~d
`
`for determining the current time zone in which the
`
`timepiece is located by comparison of the current
`
`latitude and longitude of the timepiece with a time
`
`zone data base contained in memory 103. An offset is
`
`20 added to the received UTC time based on the position of
`
`the timepiece and the time zone data base in memory 103
`
`for generating a display of local time on display 12.
`
`Processor 102 can be embodied by a readily available
`
`microprocessor, an ASIC, or by dedicated logic
`
`25 configured to provide the functions of the present
`
`invention as long as the selected device has sufficient
`
`processing power and speed for the various functions.
`
`Memory 103 can be either a dedicated memory, such as a
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`read only memory (ROM), or part of processor 102.
`
`Additionally, the functions of the GPS receiver 101,
`
`processor 102, memory 103, crystal 104 and clock chip
`
`105 can be provided on a single ASIC or module.
`
`5
`
`When the received satellite data is determined to
`
`be invalid, such as when the timepiece is not within
`
`line-of-sight of the satellite constellation and not
`
`receiving the transmitted data or when the GPS receiver
`
`outputs an indication in the data stream that the
`
`10
`
`received data is invalid, the timepiece automatically
`
`changes from a primary mode of operation to a backup
`
`mode of operation, in which time is updated and
`
`displayed based on an internal crystal-based source.
`
`In Figure 3, the internal crystal-based source is
`
`15
`
`formed by a crystal 104 and clock chip 105 which are
`
`embodied by a readily available crystal and clock chip
`
`integrated circuit which provides sufficient time
`
`keeping accuracy. Once the received satellite data is
`
`determined to again be valid, the timepiece
`
`20 automatically changes back to the primary mode of
`
`operation and time is updated and displayed based on
`
`the more accurate satellite-based time.
`
`A data base contained in memory 103 contains a
`
`parameterization of the various time zones of the world
`
`25 as time zone offset counts from Greenwich Mean Time.
`
`While the data base according to the invention includes
`
`data for all 24 world time zones, the concept is
`
`illustrated for a portion of an exemplary time zone
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`data base showing the time zones of only the United
`
`States in the Figure 4. cyclical and seasonal time
`
`zone data can be included in the time zone data base as
`
`well.
`
`5
`
`Generally speaking, the time zones of the world
`correspond to longitude lines with longitude (lon) o·
`passing through Greenwich, England. The first time
`
`zone, having a time zone offset count of zero, extends
`from 7.5 degrees east and west of lon o·. Every 15"
`
`10
`
`longitude from the termination of time zone zero (±7.5"
`
`longitude) generally demarks the edge of another time
`
`zone. Due to the direction of the rotation of the
`
`earth, one hour is decremented for each time zone to
`the west of lon o·, while one hour is added per time
`zone to the east of lon o• to generally give local
`
`15
`
`time.
`
`The time zone data base in memory 103 forms an
`
`exception table because each country can set its own
`
`time standard. For instance, Newfoundland is 3.5 hours
`
`20 behind Greenwich, whereas India is 5.5 hours ahead of
`
`GMT, while saudi Arabia does not conform to the time
`
`zone system. Another requirement of the time zone data
`
`base is to compensate for the fact that borders of
`
`countries do not fall exactly along longitude/standard
`
`25
`
`time zone lines. For example, the entire country of
`
`mainland China is eight hours ahead of GMT, even though
`
`it covers approximately 45• of longitude, or three time
`
`zones. Thus, reliance solely upon the 15" longitudinal
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`time zone lines would not necessarily generate local
`time correctly. Consequently, the time zone data base
`according to the present invention is partitioned in an
`arrangement of data based on boundaries of countries
`
`5 and on the latitudinal and longitudinal data of world
`time zones to provide an accurate display of local
`
`time. Cyclical and seasonal time zone data can also be
`incorporated in the arrangement of time zone data.
`In Figure 4, the United States has been tabularly
`10 partitioned according to latitude and longitude of the
`If the timepiece is located to
`
`respective time zones.
`
`the east of lon 85°, then the timepiece is in the
`Eastern Time Zone and an offset of -5 hours from GMT is
`required to derive local time. The time zone offset
`15 count is -10 because the timepiece resolves time zones
`If the timepiece is located north of
`
`by the half-hour.
`36.18° latitude, and east of 88° longitude, an offset
`of -5 hours is required to give a correct local time in
`the Eastern Time Zone. Thus, different segments of
`20 different continents are partitioned by latitude and
`longitude corresponding to particular time zones for
`
`all of the remaining time zones of the world (which are
`not shown) in the time zone data base to provide global
`coverage. Errors introduced in the deduction of local
`time for each region can be minimized by the degree and
`accuracy of partitioning provided in the time zone data
`
`25
`
`base. Of course, a time zone data base can be arranged
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`in any manner for producing local time in accordance
`
`with the present invention.
`
`Desirably, the timepiece according to the present
`invention also includes a solar panel 20 for converting
`5 solar energy to electrical energy, a battery 107 and a
`power supply logic circuit 106. Power supply logic
`
`circuit 106 selects the source of power for the
`
`timepiece depending whether there is sufficient solar
`energy received by solar panel 20 for powering the
`
`10
`
`timepiece over power buses 108 and 110. When
`
`15
`
`insufficient energy is received via panel 20, battery
`
`107 is selected to supply the timepiece. If power
`supply logic circuit 106 detects that available energy
`(solar and battery) is below a particular threshold,
`then satellite reception functions will not be
`energized and the timepiece will display crystal-based
`time. When solar panel 20 is selected, logic circuit
`106 provides an indication over line 109 to processor
`102 so that the solar power display portion 19 of
`
`20 display 12 is activated.
`
`As mentioned, the present invention includes two
`operating modes for converting GMT to the correct local
`time.
`In the primary mode of operation, local time is
`automatically displayed based on the latitudinal and
`
`25
`
`longitudinal position of the present invention, as
`
`determined from time and position data received from
`
`the constellation of GPS satellites. As the present
`
`invention enters a new time zone, that is, as the
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`present invention changes global position, time is
`
`automatically updated to reflect local time. When
`
`operating in the primary mode, the present invention
`
`provides a visual indication that valid data is
`
`5 currently being received from the GPS system.
`
`In the back-up mode of operation, which occurs
`
`automatically when the present invention is not within
`
`line-of-sight with the GPS satellite constellation,
`
`displayed local time is based on the internal crystal-
`
`10 based source. The backup mode typically occurs when
`
`the present invention is in a building, an aircraft or
`
`the like, or when insufficient available electrical
`
`power precludes primary mode operation. When operating
`
`in the back-up mode, the displayed time can be manually
`
`15 updated by a user to reflect local time. However, this
`
`approach is not necessary because the present invention
`
`merely needs to be placed within line-of-sight with the
`
`GPS satellite constellation for automatically updating
`
`the local time using the features of the primary mode
`
`20 of operation. Time calibration errors which occur when
`
`operating in the back-up mode, caused by temperature
`
`instability or frequency drift of the internal crystal(cid:173)
`
`based time source, are eliminated upon re-acquisition
`
`of the time and position data signals from the GPS
`
`25 satellite constellation as described below.
`
`Figures 5a and 5b show a flow diagram according to
`
`the invention for automatically changing between the
`
`primary and backup modes of operation. At step 120,
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`processor 102 reads the satellite data output from GPS
`
`receiver 101. At step 121, processor 102 extracts
`
`satellite data valid, UTC, latitude, and longitude data
`
`from the data stream.
`
`If the satellite data is valid
`
`5 at step 122, then the Quartz Time flag is cleared at
`
`step 123. If the Quartz Time flag had been previously
`
`set, the backup mode of operation is automatically
`
`changed to the primary mode of operation when the time
`
`display is updated at step 141. The received UTC data
`
`10
`
`is stored at step 124, and compared with the most
`
`recently stored UTC time at step 125.
`
`If the UTC time
`
`has not changed at step 125 (that is, incremented),
`
`then flow returns to step 120 so that the next packet
`
`of time and position data can be read.
`
`15
`
`If the UTC has changed at step 125, then processor
`
`102 tests whether the Manual Time Zone Override
`
`condition is enabled at step 126. If Manual Time Zone
`
`Override condition is disabled, the latitude and
`
`longitude data extracted from the data stream is used
`
`20
`
`to derive a Time Zone Offset Count at step 127. The
`
`Time Zone Offset Count is then added in one-half hour
`
`increments to the received UTC to create a local time-
`
`of-day at step 128.
`
`If the Manual Time Zone Override
`
`condition is enabled at step 126, a manually supplied
`
`25 Time Zone Offset Count is added in one-half hour
`
`increments to the UTC to create a local time-of-day at
`
`step 128. The half-hour increments of the Time Zone
`
`Offset Count allows the present invention to operate
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`correctly for geographical areas which do not have
`
`local time which is at a multiple hour unit from GMT,
`
`such as Newfoundland in which local time is -3.5 hours
`
`from GMT.
`
`5
`
`If the satellite data is invalid at step 122, then
`
`the Quartz Time flag is tested to determined whether it
`
`is enabled at step 129.
`
`If the Quartz Time flag is not
`
`enabled, then the last received UTC is stored and
`
`becomes the Current UTC Base at step 130. The most
`
`10
`
`recent Time Zone Offset Count is stored at step 131 and
`
`becomes the current Time Zone Offset Count. The Quartz
`
`Time flag is then enabled at step 0132 so that the
`
`backup mode is automatically entered after the display
`
`is updated at step 141. Afterward, the Time Zone
`
`15 Offset Count is added to the received UTC to create a
`
`local time-of-day at step 128.
`
`If the Quartz Time flag is enabled at step 129,
`
`flow moves to step 133. After one second has expired
`
`at step 133, the UTC register is incremented at step
`
`20 134 and the Time Zone Offset Count is added to the UTC
`
`to create a local time-of-day at step 128.
`
`If one
`
`second has not expired at step 133, the next packet of
`
`time and position data is read at step 120.
`
`From step 128, it is determined whether the
`
`25
`
`International Date Line has been crossed at step 135.
`
`If the previous longitude of the timepiece has changed
`
`from west to east at step 136, then the date line has
`
`been crossed from east to west and 1 day is added to
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`the date at step 137. Similarly, if the previous
`
`longitude of the timepiece has changed from east to
`
`west at step 136, then 1 day is subtracted from the
`
`current date at step 138.
`
`5
`
`Afterwards at step 139, the local time is tested
`
`for the occurrence of midnight.
`
`If midnight local time
`
`has occurred, the date is incremented at step 140; if
`
`it has not, the date is not changed.
`
`Finally, the local time displayed by the timepiece
`
`10
`
`is updated at step 141. Accordingly, processing
`
`returns to step 120.
`
`On power up, or after loss of RF signal, a user
`
`must wait briefly (typically less than 30 seconds) for
`
`the satellite acquisition time for accurately setting
`
`15
`
`the time of the timepiece.
`
`If, at power up, the
`
`present invention is not within line-of-sight with the
`
`satellite constellation, the user can optionally set
`
`the current time manually. Time is then displayed
`
`based upon the internal crystal-based time source until
`
`20
`
`the time and position information from the satellite
`
`constellation is acquired.
`
`Figure 6 shows a flow diagram for manually setting
`
`various parameters of the timepiece according to the
`
`present invention, such as time, time zone, date and
`
`25 enabling/disabling the primary mode of operation. When
`
`the timepiece is in the normal TIME mode at step 180,
`
`the timepiece generates a time display in accordance
`
`with the primary and backup modes of operation.
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`Depressing set button 14 causes the display of the
`
`timepiece to toggle between local time and GMT. Upon
`
`depressing mode button 13 in the normal TIME mode, the
`
`timepiece enters the MANUAL TIME SET mode at step 181,
`
`5 causing the set hours function to become active. Set
`
`button 14 increments the currently active digits of
`
`display 12 for manually setting the hours. Depressing
`
`mode button 13 a second time causes the minutes digits
`
`to become active with set button 14 incrementing the
`
`10 active digits. Depressing mode button 13 yet again
`
`causes the MANUAL TIME ZONE OFFSET COUNT to become
`
`active at step 182. Pressing set button 14 increments
`
`the time zone counter.
`
`The SET DATE mode is entered at step 183 by
`
`15 depressing mode button 13 causing the MONTH digits to
`
`become active. Set button 14 increments the active
`
`MONTH digits. Depressing mode button 13 again causes
`
`the DAY digits to become active. Depressing set button
`
`14 manually increments the currently active DAY digits.
`
`20 Pressing mode button 13 enters the SAT EN mode at step
`
`184.
`
`If the satellite data is manually disabled at
`
`step 184, the manually entered data is invoked.
`
`Otherwise, reacquisition of satellites causes the
`
`manual data to be overwritten when the manual set mode
`
`25
`
`is exited. Depressing mode button 13 enables
`
`positional information of the timepiece to be displayed
`
`at step 185 (Figure 7).
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`The foregoing is a complete description of the
`
`present invention. The scope of the invention should
`
`only be limited by the following claims.
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`WHAT
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