(12) United States Patent
`USui
`
`USOO641463OB1
`(10) Patent No.:
`US 6,414,630 B1
`(45) Date of Patent:
`Jul. 2, 2002
`
`(54) POSITION DETECTION APPARATUS USED
`FOR A MOBILE OBJECT
`
`(75) Inventor: Takashi Usui, Kanagawa (JP)
`(73) Assignee: Sony Corporation, Tokyo (JP)
`(*) Notice:
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 08/681,374
`(22) Filed:
`Jul. 23, 1996
`(30)
`Foreign Application Priority Data
`Aug. 2, 1995
`(JP) ............................................. T-197739
`(51) Int. Cl. .................................................. G01S 5/14
`(52) U.S. Cl. ................... 3427357.09; 342/455; 701/208
`(58) Field of Search ....................... 342/375.06, 357.07,
`342/357.08, 357.09, 357.1, 357.13, 455,
`457; 701/208
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`5/1989 Manion ....................... 342/30
`4,835,537 A
`5,025,261 A * 6/1991. Ohta et al.............. 342/357.07
`5,153,836 A * 10/1992 Fraughton et al. .......... 701/301
`
`5/1994 Sass ...................... 342/357.08
`5,317,321. A
`5,442,805 A * 8/1995 Sagers et al. ............... 342/457
`5,689.269 A * 11/1997 Norris ................... 342/357.08
`FOREIGN PATENT DOCUMENTS
`WO 93/O1576
`* 1/1993
`WO
`* cited by examiner
`Primary Examiner-Gregory C. Issing
`(74) Attorney, Agent, or Firm-Jay H. Maioli
`(57)
`ABSTRACT
`A position detection apparatus can accurately detect user's
`own position and other user's position. The position detec
`tion apparatus includes a position detecting means (1) for
`detecting user's own position, a memory means (2) for
`Storing therein map information, a transmitting-receiving
`means (4) for transmitting user's own identification data and
`user's own position information from the position detecting
`means (1) and receiving other user's identification data and
`other user's position information and a display means (3)
`Supplied with user own position information from the posi
`tion detecting means (1), other user's position information
`from the transmitting-receiving means (4) and the map
`information from the memory means (2) and displaying a
`map on which marks indicating user's or other user's
`position or user's own and other user's positions are put.
`
`7 Claims, 6 Drawing Sheets
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`Input
`Externo
`Information
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`Multiplexing
`Medins
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`Transmitting
`- Receiving
`Medins
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`User's Own
`identification Data
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`Position
`Detecting
`Meons
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`User's Own
`Position
`Information
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`Output
`Externo
`information
`6
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`Identification
`Data Judgeme
`Means
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`Other User's
`Position
`Information and
`Identification
`Data
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`Transmission
`Determining
`Information
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`Map
`Information
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`ASUS-1020, Page 1
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`U.S. Patent
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`Jul. 2, 2002
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`Sheet 1 of 6
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`US 6,414,630 B1
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`F1 G. 1 (PRIOR ART)
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`1
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`Position
`Detecting
`Medins
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`Position
`Information
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`Map Information
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`Receiving
`Unit
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`Signal
`Processing
`Unit
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`Microcomputer
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`ASUS-1020, Page 2
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`U.S. Patent
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`Jul. 2, 2002
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`Sheet 2 of 6
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`US 6,414,630 B1
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`F/G 3
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`Position
`Detecting
`Medins
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`User's Own
`Identificotion
`Dolto
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`Transmitting
`-Receiving
`Medins
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`User's Own
`Position
`Information
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`Identificotion
`DOto
`Judgement
`Medins
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`Other User's
`POsition
`Information
`And
`IdentificOltion
`Doto
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`IdentificOtion
`DOto
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`U.S. Patent
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`Jul. 2, 2002
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`Sheet 3 of 6
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`US 6,414,630 B1
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`F/G. 5
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`ASUS-1020, Page 4
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`U.S. Patent
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`Jul. 2, 2002
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`Sheet 4 of 6
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`US 6,414,630 B1
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`Position
`Detecting
`MeOns
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`User's Own
`Identification
`Doto
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`4.
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`Transmitting
`- Receiving
`Meons
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`User's Own
`Position
`Information
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`IdentificOtion
`Data Judgement
`Meons
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`Map
`Information
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`Other User's
`Position
`Information dnd
`Identification
`Doto
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`Transmission
`Determining
`Information
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`ASUS-1020, Page 5
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`U.S. Patent
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`Jul. 2, 2002
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`Sheet 5 of 6
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`US 6,414,630 B1
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`ASUS-1020, Page 6
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`U.S. Patent
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`Jul. 2, 2002
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`Sheet 6 of 6
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`US 6,414,630 B1
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`F/G 3
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`4s
`User's Own
`ldentification Doto
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`Position
`Detecting
`MeOns
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`User's Own
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`Mop
`information
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`Input
`Externo
`Information
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`Multiplexing
`Medins
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`Transmitting
`- Receiving
`Medins
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`Output
`External
`Information
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`Identification
`Data Judgeme
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`Other User's
`Position
`Information Ond
`Identification
`Doto
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`Transmission
`Determining
`Information
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`ASUS-1020, Page 7
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`

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`1
`POSITION DETECTION APPARATUS USED
`FOR A MOBILE OBJECT
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`US 6,414,630 B1
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`2
`random noise) code generated therein. The message signal
`and the pseudo-distance Signal are Supplied to a microcom
`puter 13, in which they are computed for obtaining the
`present position of the mobile object. Therefore, there are
`obtained position data output (including data Such as
`latitude, longitude, altitude, azimuth or speed).
`The microcomputer 13 judges a GPS satellite which is
`able to receive radio waves at that time based on a clock
`Signal from a clock circuit 14 belonging to the microcom
`puter 13 and almanac (calendar) data from the GPS satellite,
`and Supplies the code control signal to the Signal processing
`unit 12 based on a judged result thereby to generate the PRN
`code of the GPS satellite capable of receiving the radio
`wave. Then, position information from the output Side, i.e.,
`an output terminal 15 of the microcomputer 13 is supplied
`to the display means 3 (see FIG. 1) as described above.
`When people are going to a destination by their own cars,
`they are communicating with each other through radio
`transmitter-receiver. Further, when a taxi control center
`issues commands to taxis with radio transmitter-receivers or
`taxis with radio transmitter-receivers communicate with
`each other, radio transmitter-receivers are used similarly.
`If the position detection apparatus mentioned in the
`preamble is mounted on the car, then the present position of
`the car with the position detection apparatus mounted
`thereon can be detected clearly. However, only by the radio
`communication, it is impossible to accurately detect the
`positions of other cars and taxis.
`
`SUMMARY OF THE INVENTION
`In View of the aforesaid aspect, it is an object of the
`present invention to provide a position detection apparatus
`which can accurately detect user own position and other
`user's position.
`According to an aspect of the present invention, there is
`provided a position detecting apparatus for a mobile object
`which is comprised of position detecting means mounted on
`a first mobile object for detecting a position of the first
`mobile object, transmitting-receiving means for transmitting
`position information of the first mobile object detected by
`the position detecting means and receiving position infor
`mation of a Second mobile object transmitted from the
`Second mobile object, memory means for Storing map
`information, and display means Supplied with the position
`information of the first mobile object from the position
`detecting means, the position information of the Second
`mobile object from the transmitting-receiving means and
`map information read out from the memory means in
`response to the position information of the first or Second
`mobile object and displaying a map on which a mark
`indicative of the position of the first mobile object and/or the
`position of the Second mobile object is put.
`According to the present invention, user's own position
`information from the position detecting means, other user's
`position information from the. transmitting-receiving means
`and the map information from the memory means are
`Supplied to the display means and thereby a map with marks
`indicating user's own position or other user's position or
`users and other user's position put-thereon is displayed.
`
`BRIEF: DESCRIPTION OF THE DRAWINGS
`FIG. 1 is a Schematic block diagram showing a conven
`tional position detection apparatus,
`FIG. 2 is a schematic block diagram showing a GPS
`receiver;
`
`BACKGROUND OF THE INVENTION
`The present invention relates to a position detection
`apparatus for use with a mobile object, Such as automobiles,
`airplanes or ships.
`FIG. 1 of the accompanying drawings shows a conven
`tional position detection apparatus. This position detection
`apparatus is mounted on a car when it is in use. A position
`detecting means 1 detects the position of a car and indicates
`a detected position of the car in the form of position
`information comprising latitude and longitude. A memory
`means 2 comprises a CD-ROM (compact disc-read-only
`memory) and a CD-ROM player for reproducing the
`CD-ROM. Map data of every place are stored in the
`CD-ROM. The memory means 2 is controlled by detected
`position information from the position detecting means 1
`and position information entered by the operator So that a
`map is selected from the CD-ROM in accordance with
`latitude and longitude of that position information and a
`reduced Scale Selected by the operator. Selected map infor
`mation is Supplied to a display means 3. On the other hand,
`the detected position information from the position detecting
`means 1 also is Supplied to the display means 3 and
`displayed on the map as a mark Such as an arrow by the
`display means 3. AS the display means 3, there may be used
`a cathode-ray tube, a liquid-crystal display device, a plasma
`display device, etc.
`A GPS receiver, which is an example of the position
`detecting means 1, will be described with reference to FIG.
`2. Before describing the GPS receiver, a meaning and a
`measuring principle of the GPS will be described below in
`brief. Officially, GPS is referred to as “NAVSTAR/GPS",
`and “NAVSTAR/GPS” is a combination of capital letters of
`NAVigation system with Time And Ranging/Global Posi
`tioning System. According to the measuring principle of the
`GPS, delay times of radio waves transmitted to the Earth
`from a plurality of GPS satellites orbiting the Earth are
`measured, and the position of a mobile object is measured by
`obtaining a present position of a mobile object on the Earth
`from the orbits of the GPS satellites. The position of the
`mobile object on the Earth can be obtained by measuring
`distances among the three GPS Satellites and the present
`position of the mobile object on the Earth based on radio
`waves transmitted from the three GPS satellites.
`Furthermore, Since a common error caused by errors of
`clocks of GPS receivers can be eliminated by measuring
`distances among four GPS Satellites and the present position
`of the mobile object on the Earth, latitude, longitude and
`altitude of the position of the mobile object on the earth can
`be measured.
`In FIG. 2, reference numeral 10 depicts an antenna for
`receiving radio waves from a GPS satellite (not shown). A
`55
`microStrip antenna, for example, may be used as the antenna
`10. A reception signal (spectrum diffusion signal) of 1.2 GHz
`or 1.5 GHz received at the antenna 10 is supplied through a
`coaxial cable (not shown) to a receiving unit 11, in which it
`is converted into an intermediate frequency Signal with a
`low frequency. The intermediate frequency Signal is Sup
`plied to a signal processing unit 12, in which it is spectrum
`inverse-diffused to provide a message Signal, a pseudo
`distance Signal and a code control Signal. The Signal
`processing unit 12 calculates a pseudo-distance by Synchro
`nizing the intermediate frequency Signal based on the recep
`tion signal from the GPS satellite and a PRN (pseudo
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`3
`FIG. 3 is a Schematic block diagram showing a position
`detection apparatus according to a first embodiment of the
`present invention;
`FIG. 4 is a diagram showing a format of packet commu
`nication;
`FIG. 5 is a diagram showing an example of map infor
`mation displayed on a picture Screen of a display means,
`FIG. 6 is a Schematic block diagram showing a position
`detection apparatus according to a Second embodiment of
`the present invention;
`FIG. 7 is a pictorial representation used to explain a
`relationship between a Service area of a communication
`System and mobile objects, and
`FIG. 8 is a Schematic block diagram showing a position
`detection apparatus according to a third embodiment of the
`present invention.
`
`15
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`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENTS
`Embodiments of the present invention will be described
`hereinafter with reference to the drawings.
`Initially, a position detection apparatus according to a first
`embodiment will be described with reference to FIG. 3. In
`FIG. 3, the GPS receiver shown in FIG. 2 is used as a
`position detecting means 1. A memory means 2 is a
`CD-ROM in which map information of every place are
`stored and a CD-ROM player. Position information from
`operator's car is Supplied from the position detecting means
`1 to the memory means 2. Then, the position information
`and map information Selected by the operator are Supplied to
`a display means 3 Such as a cathode-ray tube, a liquid-crystal
`display device or a plasma display. At that time, position
`information of operator's car is Supplied from the position
`detecting means 1 to the display means 3 and thereby
`displayed as a mark Such as an arrow on the map.
`A transmitting-receiving means 4 having an antenna 5
`transmits the position information from the position detect
`ing means 1 and identification data for operator's own car
`inputted to an input terminal 4t at every predetermined time
`with an interval of Several Seconds and receives position
`information from a position detection apparatus of other
`user's car and identification data for identifying other user's
`car. These Signals thus transmitted and received are spec
`trum diffusion modulation Signals of packet Signal compris
`ing Sync bit, identification data, latitude and longitude. The
`Sync bit is used to Synchronize bits when the packet Signal
`is received. Since a communication based on a spectrum
`diffusion modulation communication is Strong against dis
`turbance and interference from other radio waves, there is
`then the advantage that a Service area of radio
`communication, i.e., a range in which radio waves can reach
`can be widened.
`The reception signal received by the transmitting
`receiving means 4 is demodulated and thereby position
`information and identification data of one or a plurality of
`other users cars are obtained. The position information and
`the identification data are Supplied to an identification data
`judgement means 6, and the identification data judgement
`means 6 determines whether or not the identification data is
`predetermined identification data. If it is determined by the
`identification data judgement means 6 that the identification
`data is the predetermined identification data, then position
`information of the identification data is Supplied to the
`memory means 2 and map information corresponding to the
`position information is read out from the memory means 2
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`and Supplied to the display means 3. Also, the identification
`data is Supplied to the display means 3 and thereby displayed
`on a map as a mark different in Shape and color from user's
`own position information. Accordingly, identification data
`and position information other than the predetermined iden
`tification data are rejected by the identification data judge
`ment means 6. When a distance between user's own car and
`other user's car is short, position information of user's own
`car and position information of other user's car are displayed
`on the same map as distinguishable markSA and B as shown
`in FIG. 5. When on the other hand such distance is long, they
`are displayed on different maps Separately.
`A second embodiment of the present invention will be
`describe with reference to FIG. 6. Before describing the
`Second embodiment of the present invention, a relationship
`between a Service area of a communication System and
`mobile objects will be described with reference to FIG. 7.
`in FIG. 7, reference numerals 21, 22 depict transmitting
`receiving antennas of microwave communication System
`disposed with a predetermined distance therebetween. Ref
`erence numeral 23 depicts a Service area for the
`transmitting-receiving antennas 21, 22. In the Service area
`23, in order to prevent a communication from being hin
`dered by disturbance and interference of radio waves, the
`transmission of radio waves is inhibited withing the Service
`area. This will be described specifically below. In FIG. 7,
`reference numeral 24 depicts a car running within the
`Service area 23, and reference numerals 25, 26 denote cars
`running outside the service area 23. The cars 25, 26 which
`are running outside the Service area 23 are able to transmit
`and receive information therebetween by means of a com
`munication device (radio transmitter-receiver). Further,
`between the car running within the Service area 23 and the
`car running outside the Service area 23, e.g., the car 25, the
`car 25 can transmit information to the car 26 by means of the
`communication device. However, the transmission of infor
`mation from the car 24 to the car 25 is inhibited.
`Therefore, in the second embodiment shown in FIG. 6,
`transmission-inhibited area information is contained in map
`information stored in CD-ROM of the memory means 2.
`When a car is in the transmission-inhibited-area, transmis
`Sion is automatically stopped. Specifically, a position detect
`ing means 1 detects position (0, (p) of the user's own car and
`a memory means 2 Selects map information based on the
`detected position (0, (p). In that case, transmission determin
`ing information Z (when the transmission determining infor
`mation Z is “1”, transmission is permitted, and when it is
`“0”, transmission is inhibited) is obtained from the map
`information and Supplied to a transmitting-receiving means
`4 whose transmission is controlled. Specifically, when the
`transmission determining information is inhibited, the trans
`mission of the user's own identification data and user's own
`position information is transmitted. When the transmission
`determining information is permitted, it is needless to Say
`that user's own identification data and user's own position
`information are transmitted from the transmitting-receiving
`means 4. In FIG. 6, a rest of the arrangement is Similar to that
`of FIG. 3 and therefore need not be described in detail.
`A third embodiment of the present invention will be
`described with reference to FIG. 8. While user's own
`identification data and position information are transmitted
`by the transmitting-receiving means 4 and the antenna 5 and
`other user's identification data and position information are
`received by the transmitting-receiving means 4 and the
`antenna 5 in the first and second embodiments shown in
`FIGS. 3 and 6, according to the third embodiment shown in
`FIG. 8, any one of an audio signal, a video signal with or
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`ASUS-1020, Page 9
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`without an audio signal, a facsimile signal and a text data
`Signal or a plurality of external information are transmitted
`and received. Therefore, user's own position information
`from the position detecting means 1, user's own identifica
`tion data from the terminal 4S and inputted external infor
`mation from the terminal 4t are multiplexed by a multiplex
`ing means 7 and Supplied to the transmitting-receiving
`means 4 and thereby transmitted from the antenna 5. Further,
`there is provided a separating means 8. A multiplexed signal
`of one or a plurality of other users' position information,
`other user's identification data and outputted external infor
`mation received by the antenna 5 and the transmitting
`receiving means 4 is Supplied to and Separated by the
`Separating means 8, whereby the outputted external infor
`mation is outputted from an output terminal 8t and other
`user's position information and other user's identification
`data are Supplied to the identification data judgement means
`6. In FIG. 8, a rest of the arrangement is similar to that of
`FIG. 3 and therefore need not be described in detail.
`User's own and other user's own (one or a plurality of)
`position information and identification data may be fixed or
`movable.
`According to the first invention, Since the position detec
`tion apparatus includes the position detecting means for
`detecting user's own position, the memory means for Storing
`therein map information, the transmitting-receiving means
`for transmitting user's own identification data and user's
`own position information from the position detecting means
`and receiving other user's identification data and other
`user's position information and the display means for receiv
`ing user's own position information from the position
`detecting means, other user's position information from the
`transmitting-receiving means and the map information from
`the memory means and displaying a map on which marks
`indicating user's own position or other user's position or
`users and other user's positions are indicated, it is possible
`to obtain the position detection apparatus which can accu
`rately detect not only user's own position but also other
`user's position. Therefore, if user and other user are both
`mobile objects, i.e., cars and they are going to a common
`destination by their cars, the user and other user can know
`user's or other user's wrong course. Accordingly, if the user
`and other user can communicate with each other by an audio
`Signal, it becomes easy to correct the user's or other user's
`wrong course. When the present invention is applied to the
`taxi Service control System in which the taxi Service control
`center issues commands to a plurality of taxis or a delivery
`Service control center issues commands to a plurality of
`delivery Service tracks, the taxi Service control center and
`the delivery Service control center Side can accurately con
`firm the positions of the taxis and the delivery Service tracks
`So that the taxis Service control center and the delivery
`Service control center can issue commands more easily.
`According to the Second invention, in the position detec
`tion apparatus according to the first invention, the
`transmission-inhibited area information is contained in the
`map information Stored in the memory means. When the
`user's position lies in the transmission-inhibited area, the
`transmission of user's position is inhibited by Supplying the
`transmission-inhibited information from the memory means
`to the transmitting-receiving means. Therefore, in addition
`to the effects achieved by the first invention, when the user's
`position lies in the transmission-inhibited area, the trans
`mission of user's identification data and user's position
`information from the transmitting-receiving means can be
`inhibited automatically.
`According to the third invention, in the position detection
`apparatus according to the present invention, Since user's
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`own identification data and user's own position information
`and other information from the position detecting means are
`transmitted and other user's identification data, other user's
`position information and other user's other information are
`received by the transmitting-receiving means, in addition to
`the effects achieved by the first invention, it becomes
`possible to transmit and receive other information.
`Therefore, when user and other user are both mobile objects,
`e.g., cars and they are going to a common destination by
`cars, Since the user or other user can know user's or other
`user's wrong course, if the user and other user can commu
`nicate with each other by an audio signal or the like through
`transmission and reception of other information, then it
`becomes possible for user and other user to communicate
`with each other without providing radio transmitter and
`receiver Separately.
`Having described preferred embodiments of the invention
`with reference to the accompanying drawings, it is to be
`understood that the invention is not limited to those precise
`embodiments and that various changes and modifications
`could be effected therein by one skilled in the art without
`departing from the Spirit or Scope of the invention as defined
`in the appended claims.
`What is claimed is:
`1. A position detecting apparatus for a mobile object
`comprising:
`position detecting means mounted on a first mobile object
`for detecting a position of Said firs: mobile object;
`transmitting-receiving means for transmitting position
`information of said first mobile object detected by said
`position detecting means and receiving position infor
`mation of a Second mobile object transmitted from Said
`Second mobile object;
`memory means for Storing map information; and
`display means Supplied with Said position information of
`Said first mobile object from Said position detecting
`means, the position information of Said mobile object
`from Said transmitting-receiving means and map Infor
`mation read out from Said memory means in response
`to Said position information of one of Said first and
`Second mobile objects and for displaying a map on
`which a mark indicative of the position of said first
`mobile object and/or the position of said second mobile
`object is put, wherein
`Said transmitting-receiving means transmits the position
`information of said first mobile object detected by said
`position detecting means and identification data of Said
`first mobile object and receives the position informa
`tion of Said Second mobile object and identification data
`of Said Second mobile object transmitted from Said
`Second navigation object, and
`Said position detection apparatus includes identification
`data judging means for Supplying the position infor
`mation of Said Second mobile object to Said memory
`means when Said identification data judging means
`determines that the identification data of Said Second
`mobile object is predetermined identification data.
`2. A position detection apparatus for a mobile object as
`claimed in claim 1, wherein when Said identification data
`judging means determines that the identification data of Said
`Second mobile object is Said predetermined identification
`data, then the identification data of Said Second mobile
`object is Supplied to Said display means and Said Second
`mobile object is displayed on Said display means with a
`mark different from that of said mobile object.
`3. A position detection apparatus for a mobile object as
`claimed in claim 1, wherein Said transmitting-receiving
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`ASUS-1020, Page 10
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`7
`means transmits the position information of Said first mobile
`object, the identification data of Said mobile objects and
`other information, and receives the position information of
`Said Second mobile object, the identification data of Said
`Second mobile object and other information.
`4. A position detection apparatus for a mobile object as
`claimed in claim 3, wherein Said other information is audio
`information.
`5. A position detection apparatus for a mobile object as
`claimed in claim 1, wherein when a distance between said
`first and Second mobile object is relatively short, Said marks
`indicating Said first and Second mobile objects are displayed
`on the same map, and when a distance between Said first and
`Second mobile objectS is relatively long, said marks indi
`cating Said first and Second mobile objects are respectively
`displayed on different maps.
`
`15
`
`US 6,414,630 B1
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`8
`6. A position detection apparatus for a mobile object as
`claimed in claim 1, wherein the map information Stored in
`Said memory means contains information of transmission
`inhibited area in which a transmission is inhibited, and when
`said first mobile object lies in said transmission-inhibited
`area, the information of Said transmission-inhibited area is
`Supplied from Said memory means to Said transmitting
`receiving means thereby to inhibit a transmission operation
`of Said transmitting-receiving means.
`7. A position detection apparatus for a mobile object as
`claimed in claim 1, wherein Said position detecting means
`obtains information of position, latitude and longitude of
`Said first mobile object by receiving radio waves from a
`plurality of Satellites.
`
`ASUS-1020, Page 11
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`