`
`EXHIBIT
`
`EXHIBIT
`DSS-2007
`
`DSS—2007
`
`

`
`US008837653B2
`US008837653B2
`
`(12) United States Patent
`(12) United States Patent
`Keegan et a].
`Keegan et al.
`
`(10) Patent N0.:
`(10) Patent No.:
`(45) Date of Patent:
`(45) Date of Patent:
`
`US 8,837,653 B2
`US 8,837,653 B2
`*Sep. 16, 2014
`*Sep. 16, 2014
`
`(54) HIGH FREQUENCY SIGNAL RECEIVER
`(54)
`HIGH FREQUENCY SIGNAL RECEIVER
`WITH SELF-CALIBRATED GROUP DELAY
`WITH SELF-CALIBRATED GROUP DELAY
`COMPENSATION
`COMPENSATION
`
`(56)
`(56)
`
`References Cited
`References Cited
`U.S. PATENT DOCUMENTS
`U.S. PATENT DOCUMENTS
`
`(71) Applicant: Deere & Company, Moline, IL (US)
`Applicant: Deere & Company, Moline, IL (US)
`(71)
`(72)
`(72)
`
`Inventors: Richard G. Keegan, Palos Verdes
`Inventors: Richard G. Keegan, Palos Verdes
`Estates, CA (US); Jerry E. Knight,
`Estates, CA (US); Jerry E. Knight,
`Long Beach, CA (US)
`Long Beach, CA (US)
`
`(73)
`(73)
`(*)
`(*)
`
`Assignee: Deere & Company, Moline, IL (US)
`Assignee: Deere & Company, Moline, IL (US)
`
`Notice:
`Notice:
`
`Subject to any disclaimer, the term of this
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`U.S.C. 154(b) by 0 days.
`This patent is subject to a terminal dis-
`This patent is subject to a terminal dis
`claimer.
`claimer.
`
`Filed:
`Filed:
`
`(21) Appl.No.: 13/892,209
`(21)
`Appl. No.: 13/892,209
`(22)
`(22)
`(65)
`(65)
`
`May 10, 2013
`May 10, 2013
`Prior Publication Data
`Prior Publication Data
`US 2013/0329841A1
`Dec. 12,2013
`US 2013/0329841A1
`Dec. 12,2013
`
`(60)
`(60)
`
`(51)
`(51)
`
`(52)
`(52)
`
`(58)
`(58)
`
`Related U.S. Application Data
`Related US. Application Data
`Provisional application No. 61/657,650, filed on Jun.
`Provisional application No. 61/657,650, ?led on Jun.
`8, 2012.
`8, 2012.
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`
`Int. Cl.
`Int. Cl.
`H04B 1/10
`H04B 1/10
`H04B 1/12
`H04B 1/12
`U.S. Cl.
`US. Cl.
`CPC .................................... .. H04B 1/123 (2013.01)
`CPC .................................... .. H04B 1/123 (2013.01)
`USPC ........................................................ .. 375/350
`USPC ........................................................ .. 375/350
`Field of Classification Search
`Field of Classi?cation Search
`CPC
`H04B1/123; H04L 25/061; H04L 7/0054;
`CPC
`H04B 1/123; H04L 25/061; H04L 7/0054;
`H04L 27/364
`H04L 27/364
`USPC ........................................ .. 375/232—236, 350
`USPC ........................................ .. 375/2324236, 350
`See application file for complete search history.
`See application ?le for complete search history.
`
`
`
`6,233,276 B1
`5/2001 Simeon
`5/2001
`Simeon
`6,233,276 B1
`7,646,830 B1*
`1/2010 Weill
`.......................... .. 375/341
`1/2010
`7,646,830 B1*
`Weill .......................... .. 375/341
`8,294,605 B1* 10/2012 Pagnanelli
`341/144
`..
`Pagnanelli
`341/144
`10/2012
`8,294,605 B1*
`2002/0168951 A1* 11/2002 Paulus et al.
`455/130
`11/2002
`2002/0168951 A1*
`Paulus et a1.
`455/130
`2003/0231723 A1* 12/2003 Hansen ..... ..
`375/343
`12/2003
`2003/0231723 A1*
`Hansen ........ ..
`375/343
`7/2005 Garg et al.
`..
`455/132
`2005/0159120 A1*
`2005/0159120 A1*
`7/2005 Garg etal. ..
`455/132
`1/2006 Tuttle et al.
`................. .. 341/120
`2006/0001559 A1*
`2006/0001559 A1*
`1/2006 Tuttle et a1. ................. .. 341/120
`(Continued)
`(Continued)
`FOREIGN PATENT DOCUMENTS
`FOREIGN PATENT DOCUMENTS
`1434401 A1
`6/2004
`6/ 2004
`1434401 A1
`8/2009
`2086194 A2
`8/2009
`2086194 A2
`11/1999
`WO 99/60701 A1
`11/1999
`WO 99/60701 A1
`OTHER PUBLICATIONS
`OTHER PUBLICATIONS
`
`EP
`EP
`EP
`EP
`W0
`W0
`
`Deere & Company, ISR-WO PCT/US2013/044534, Aug. 15, 2013,
`Deere & Company, ISR-WO PCT/US2013/044534, Aug. 15, 2013,
`10 pgs.
`10 pgs.
`
`(Continued)
`(Continued)
`Primary Examiner — Don N V0
`Primary Examiner * Don N V0
`(74) Attorney, Agent, or Firm — Morgan, Lewis & Bockius
`(74) Attorney, Agent, or Firm * Morgan, LeWis & Bockius
`LLP
`LLP
`
`ABSTRACT
`(57)
`ABSTRACT
`(57)
`A signal receiver includes an antenna interface for receiving
`A signal receiver includes an antenna interface for receiving
`signals from an antenna, analog signal processing circuitry
`signals from an antenna, analog signal processing circuitry
`coupled to the antenna interface for processing the received
`coupled to the antenna interface for processing the received
`signals to produce filtered signals, sampling circuitry to
`signals to produce ?ltered signals, sampling circuitry to
`sample the filtered signals so as to produce digitized received
`sample the ?ltered signals so as to produce digitized received
`signals, a digital compensator to receive the digitized
`signals, a digital compensator to receive the digitized
`received signals and compensate for non-uniform group
`received signals and compensate for non-uniform group
`delay introduced by the analog signal processing circuitry to
`delay introduced by the analog signal processing circuitry to
`produce compensated digitized received signals, and a digital
`produce compensated digitized received signals, and a digital
`processor to process the compensated digitized received sig-
`processor to process the compensated digitized received sig
`nals so as to produce a result.
`nals so as to produce a result.
`
`23 Claims, 13 Drawing Sheets
`23 Claims, 13 Drawing Sheets
`
`Signal
`Q
`\a
`Antenna
`Q
`Antenna
`m
`1/
`f
`
`\j/
`
`
`
`
`
`r _______ __
`
`Housing @511
`Receiver (L1) 206-a
`Circuit Board LEO
`_
`_
`Compensation
`Receiver (L1) 206-a
`_ Analog Signal
`Sampling
`Mechanism (L1)
`I
`Compensation
`I
`Processing Circuitry
`Circuitry
`(H.
`,_
`212.3
`Analog Slsnal
`S?mvllns % Mechanism (L1)
`Processing Circuitry
`Circuitry
`,.
`1
`212_a
`10.832
`2112-:
`2
`21 Q-g
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`p
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`_
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`ircu
`Analog 5'9"in
`P Analqs Séqnatm %mv::!;2
`Processing Circuitry
`205-1)
`21 0-!)
`Receiver (L5)
`Receiver(L5)m
`{Hui-“‘1
`Compensation
`
`208-c
`— /‘"3109 519"?‘
`Mechanism (L5)
`_
`:
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`Processing Circuitry
`212.;
`
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`Mechanism (L5) Q Hi Processor I
`Processing Circuin
`21}:
`: m :
`
`Processor
`Digital
`
`215
`
`PIOEXESSOI
`
`
`
`
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`Compensation
`312.9
`'
`(L2)
`Mechanism (L2)
`212%
`
`
`|
`'
`: GNSS Signal :
`4 Processor :
`:
`216
`I
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`
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`
`
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`Antenna
`2%
`interface
`interface
`2%
`
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`
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`

`
`US 8,837,653 B2
`US 8,837,653 B2
`Page 2
`Page 2
`
`(56)
`(56)
`
`References Cited
`References Cited
`U.S. PATENT DOCUMENTS
`U.S. PATENT DOCUMENTS
`2006/0133546 A1
`6/2006 Demiretal.
`6/2006
`2006/0133546 A1
`Demir et a1.
`................ .. 375/260
`2006/0262872 A1* 11/2006 G
`1
`1.
`2006/0262872 A1*
`11/2006
`Green et al. .............. ..
`"
`................ .. 375/296
`2009/0141828 A1*
`6/2009 Hf1::1I:g:t:1.
`2009/0141828 A1*
`6/2009
`Huang et al. .............. ..
`2009/0219201 A1
`9/2009 Martin etal.
`"
`9/2009
`2009/0219201 A1
`Martin et al.
`............. .. 455/192.2
`2010/0151806 A1*
`6/2010 Firoiu etal.
`455/192.2
`2010/0151806 A1*
`6/2010
`Firoiu et al. ............. ..
`2011/0274215 A1* 11/2011 Hollis ......................... .. 375/317
`2011/0274215 A1*
`11/2011
`.. 375/317
`
`Hollis ....................... ..
`
`2011/0280570 A1
`11/2011 Xiaet al.
`2011/0280570 A1 11/2011 Xia et a1.
`2014/0062782 A1*
`3/2014 Abraham ............... .. 342/357.73
`2014/0062782 A1* 3/2014 Abraham ............... .. 342/357.73
`
`OTHER PUBLICATIONS
`OTHER PUBLICATIONS
`.
`Deere & Company, International Search Report, PCT/US2013/
`Deere & Cempeny’ Internemenel Seereh Repert’ PCTMSZOW
`044541aSeP~24a2013a11PgS~
`044541, Sep. 24, 2013, 11 pgs.
`
`* Cited by examiner
`* cited by examiner
`
`

`
`U.S. Patent
`
`Sep. 16,2014
`
`Sheet 1 of 13
`
`US 8,837,653 B2
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`
`U.S. Patent
`
`Sep. 16, 2014
`
`Sheet 2 of 13
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`US 8,837,653 B2
`
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`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16,2014
`
`Sheet 3 0f 13
`Sheet 3 of 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`Antenna Interface
`Antenna Interface
`2.95
`2.9.4.
`
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`II
`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16,2014
`
`Sheet 4 0f 13
`Sheet 4 of 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`Finite Impulse
`Finite Impulse
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`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16, 2014
`
`Sheet5 of13
`Sheet 5 0f 13
`
`US 8,837,653 B2
`US 8,837,653 B2
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`
`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16,2014
`
`Sheet 6 0f 13
`Sheet 6 of 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`Digital
`Digital
`Processor \
`Processor \
`2151.
`23.4
`
`670
`674
`
`r r MMMM -3 MMMM -7
`;
`(optional)
`1
`Satellite
`Satellite
`1
`(Optional)
`r
`Positioning
`l
`Supplemental
`i
`Positioning
`:
`Supplememal
`i
`
`
`System
`1
`Receivers
`;
`system
`,
`Receivers
`i
`l
`Receiver
`
`‘~ - ~ - ~~~~~~~ ~ ~—
`
`Receiver
`
`604
`
`
`
`Communication
`Communication
`interface(s)
`interface s
`
`Memory 610
`
`\
`Operating System
`
`612
`J- 612
`
`Communications Module
`Communications Module f 614
`
`609 / User Interface Module
`609 / User interface Module
`Navigation Module
`Navigation Module
`
`Calibration Module
`Calibration Module
`
`Stored Calibration Sets
`Stored Calibration Sets
`
`616
`f 616
`J 618
`618
`
`620
`f 620
`
`622
`f 622
`
`614
`
`
`.
`
`Figure 3F
`Figure 3F
`
`602 \
`CPWS)
`
`605
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`\
`User interface
`'
`t rf
`user @255;
`
`
`
`'606
`mput Devmes _\ 608
`Input Devices
`
`
`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16,2014
`
`Sheet 7 of 13
`Sheet 7 0f 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`Bandpass Characteristic with Asymmetri: Phase
`Bandpass Characteristic with Asymmetric Phase
`{Varying Grasp 023m}
`{Varying Group Qeiay}
`
`Bandpass Characteristic with Svmmetric Phase
`Bandpass Chara:te2‘ist§c with Symmetric Phase
`(Constant Gmup Deiay)
`(Constant Gmup Defay)
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`1630
`1630
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`Straight Lme 404-a
`1
`:
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`
`Actual Phase Response
`Actual Phase Response
`402
`fl
`
`9
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`
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`
`Phase Distortion
`Phase Distortion
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`i
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`Phase Residuais
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`Coefficients
`Coef?CIentS
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`
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`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16,2014
`
`Sheet 8 0f 13
`Sheet 8 of 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`i1 dB Ripple
`$1 dB Ripple
`
`Flat Passband
`Flat Passband
`
`1.2
`1.2
`
`---------------------------------------------------------------- --
`
`1'2
`
`1
`
`0.8 ~ >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> »
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`05
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`0.4
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`1650
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` 1500
`
`Target Magnitude Respons 14
`e _
`Actuai Magnitude Response
`---------------- — -1
`Actual Magnitude Response _____ _ _ 9
`i- --------------- - -1
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`: Symmetric Response 414-a :
`£
`““ “ : Symmetric Response 41 -a :
`L— _ _ _ _ _ — — — — _ — — — — — ————J
`
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`Divisor
`
`'
`
`Dividend
`
`
`Magnitude Residuals
`Magnitude Residuals
`416.
`fllfi
`
`iFFT
`E
`
`
`
`FIR Coefficients
`FIR Coefficients
`m
`fl
`
`Figure 4B
`Figure 4B
`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16,2014
`
`Sheet 9 of 13
`Sheet 9 0f 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`1 dB Tilt
`
`12
`
`12
`
`05
`
`0.2
`
`0
`
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`1650 /
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`1500
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`Target Magnitude Response @
`: Symmetric Response 424-a }
`: Symmetric Response t_l_2_4_-e_ }
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`r *************** ~ *1
`
`Actual Magnitude Response
`Actual Magnitude Response
`522.
`g_2_g_
`
`____ __ __
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`F _ ~ ~ “ _ _ _ _ _ ~ ~ “ _ _ _ ~"'“i
`
`Divisor
`
`Dividend
`
`
`
`Magnitude Residuals
`Magnitude Residuals
`5E
`4E
`
`iFFT
`m
`
`
`
`FIR Coefficients
`FIR Coefficients
`Q
`fl
`
`Figure 4C
`Figure 4C
`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16,2014
`Sep. 16, 2014
`
`Sheet 10 of 13
`Sheet 10 0f 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`500
`529
`""""
`
`f 510
`510
`
`Receive signals from an antenna
`Receive signals from an antenna
`512
`j 512
`1,
`Process the received signals with analog signal processing circuitry to produce
`Process the received signals with analog signal processing circuitry to produce
`?ltered signals
`filtered signals
`
`514
`514
`f
`t
`Sample the filtered signals with sampling circuitry to produce digitized received
`Sample the filtered signals with sampling circuitry to produce digitized received
`signals
`signals
`I
`f 515
`Compensate the digitized received signals, with a compensation
`Compensate the digitized received signals, with a compensation
`mechanism, for non-uniform group delay and amplitude distortion
`mechanism, for non—uniform group delay and amplitude distortion
`introduced by the analog signal processing circuitry to produce
`introduced by the analog signal processing circuitry to produce
`compensated digitized received signals
`compensated digitized received signals
`l Compensating the digitized received signals includes compensating l
`I Compensating the digitized received signals includes compensating l
`516
`q“ 516
`I
`for signal distortions in a predefined range of frequencies that
`for signal distortions in a predefined range of frequencies that
`I
`includes (L1, E1) 1559 MHz to 1591 MHz, or 1559 MHz to 1610 I
`includes (L1, E1) 1559 MHz to 1591 MHz, or 1559 MHz to 1610
`l
`MHz, or 1211 MHz to 1243, or 1160 MHz to 1192 MHz (L2, L5)
`1
`MHz, or 1211 MHz to 1243, or 1160 MHz to 1192 MHz (L2, L5)
`
`__________________________
`
`1
`The amplitude distortion comprises deviation of a magnitude
`|
`The amplitude distortion comprises deviation of a magnitude
`| response of the analog signal processing circuitry from a uniform I
`response of the analog signal processing circuitry from a uniform
`|
`magnitude response across a prede?ned frequency range or a \I/
`magnitude response across a predefined frequency range or a
`|
`magnitude response curve that is symmetric with respect to a
`I
`magnitude response curve that is symmetric with respect to a
`|
`predefined center frequency of the predefined frequency range
`I
`predefined center frequency of the predefined frequency range
`
`L- . ~ 0 m ~ ~ ? ~ * 0 m ~ m “ m * 8 m ~ m “ ~ * .- ....
`
`577
`
`f' 518
`v
`Process the compensated digitized received signals so as to produce a
`result
`The result includes a navigation result
`The result includes a navigation result
`
`|
`
`\f\ 519
`519
`
`_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. _. JLJ 520
`
`I
`I
`I
`I
`
`Configure the compensation mechanism to process the digitized received
`Configure the compensation mechanism to process the digitized received
`signals using a finite impulse response filter (FIR filter) with complex filter
`signals using a finite impulse response filter (FIR filter) with complex filter
`coefficients to compensate for non-uniform group delay and amplitude
`coefficients to compensate for non—uniform group delay and amplitude
`distortion introduced by at least the analog signal processing circuitry
`distortion introduced by at least the analog signal processing circuitry
`
`I
`l
`l
`l
`
`l
`The complex filter coefficients of the FIR filter correspond to residual
`I
`I
`I
`The complex filter coefficients of the FIR filter correspond to residual
`I
`I
`phase differences between target phase values and phase values of
`I
`I
`I
`phase differences between target phase values and phase values of
`I
`I corresponding frequency components of the digitized received signals I
`I
`I
`corresponding frequency components of the digitized received signals
`l
`land to amplitude ratios between one or more target amplitude values and I
`I and to amplitude ratios between one or more target amplitude values and I
`I
`I amplitude values of corresponding frequency components of the digw 522
`I amplitude values of corresponding frequency components of the digitize
`received signals
`\}|L\I‘ 522
`I
`received signals
`|
`
`-.-—......-._......._.........._..__-._—...._......_..___-._._...._._...._..___-.___-._._...._.n
`
`Figure 5A
`Figure 5A
`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16, 2014
`
`Sheet 11 0f 13
`Sheet 11 of 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`I"
`
`526
`526
`Inject a calibration signal at an antenna interface of the signal receiver using a I
`inject a calibration signal at an antenna interface of the signal receiver using a |
`calibration signal generator coupled to the antenna interface
`calibration signal generator coupled to the antenna interface
`I
`
`r
`j The calibration signal generator injects the calibration signal at the l
`3 The calibration signal generator injects the calibration signal at the
`I
`j
`antenna interface at a duty cycle of less than a prede?ned traction \:/|\ 528
`3
`antenna interface at a duty cycle of less than a predefined fraction \|3/|\ 528
`j
`(e.g., one percent)
`l
`3
`(e.g., one percent)
`l
`I
`r The calibration signal includes a time domain signal corresponding to I
`|
`The calibration signal includes a time domain Signal corresponding to |
`530
`I
`orthogonal frequency components in a prede?ned range of
`|
`‘
`3
`orthogonal frequency components in a predefined range of
`\|3/3\ 530
`L
`frequenCies
`L
`frequencies
`3
`.— ———————————————————————— — —
`I
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`The calibration signal includes a step carrier signal
`\I3/:\ 532
`I
`The calibration signal includes a step carrier signal W 532
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`_ _ _ _ _ — _ _ _ _ _ _ — _ _ _ _ _ _ — _ _ _ _ _ _. _l
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`The calibration signal includes a swept carrier signal
`\L/:-\ 534
`3
`The calibration signal includes a swept carrier signal w 534
`j
`I_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _|
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`j The calibration signal has an amplitude at least a predefined amount |
`3 The calibration signal has an amplitude at least a predefined amount
`I
`l
`j(e.g., 40 db) greater than an amplitude of the received signals from thel
`3(e.g.. 40 db) greater than an amplitude of the received signals from thel
`j
`antenna
`\L/l-\ 536
`3
`antenna
`\L/I‘ 536
`l
`l
`3
`:
`I The amplitude and duration of the calibration signal is determined in
`l The amplitude and duration of the calibration signal is determined in
`l
`l accordance with a criterion that the average power of the calibration |
`3
`I accordance with a criterion that the average power of the calibration 3
`l
`i
`signal is maintained lower than a value which would impact gain
`|
`I
`signal is maintained lower than a value which would impact gain
`3
`\_3/‘:\ 538
`I
`settings of a gain control circuit of the signal receiver
`l
`settings of a gain control circuit of the signal receiver
`\_l/‘:\ 538
`
`r _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ ._
`
`lProvide synchronized clock timing signals from a clock, to the calibration signal I
`lProvide synchronized clock timing signals from a clock, to the calibration signall
`l
`generator and the sampling circuitry
`l
`l
`generator and the sampling circuitry
`I
`L
`542
`542
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`Configure the compensation mechanism in accordance With Signals received I
`3 Configure the compensation mechanism in accordance with signals received I
`by the compensation mechanism in response to injection of the calibration
`|
`by the compensation mechanism in response to injection of the calibration
`I
`l
`signal at the antenna interface
`|
`signal at the antenna interface
`l
`l
`Configuring the compensation mechanism includes coherently
`Configuring the compensation mechanism includes coherently
`3
`|
`|
`l
`: accumulating digitized received signals corresponding to the injected
`3 accumulating digitized received signals corresponding to the injected I
`I
`\Jj/ir 543
`calibration signals
`l
`\J/1\ 543
`calibration signals
`
`II I
`
`Figure SB
`Figure 5B
`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16, 2014
`Sep. 16, 2014
`
`Sheet 12 0113
`Sheet 12 of 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`:
`I
`I
`I
`
`l
`|
`The control instructions include instructions for controlling when the
`I
`|
`The control instructions include instructions for controlling when the
`calibration signal generator injects the calibration signal at the antenna
`calibration signal generator injects the calibration signal at the antenna
`interface
`\/I"I 546
`interface
`4* 546
`
`|
`I
`|
`I
`|
`I
`I
`|
`
`| The control instructions include instructions for controlling configuration of |
`I
`I The control instructions include instructions for controlling configuration of
`I
`|
`the compensation mechanism in accordance with the digitized received
`|
`I
`the compensation mechanism in accordance with the digitized received
`I
`I
`| signals received in response to the injection of the calibration signal at the
`I signals received in response to the injection of the calibration signal at the
`I
`antenna interface
`\/IKI 548
`|
`antenna interface
`\-/:—\I_ 548
`
`l — — — ~ — — — — ~ — — — — — — ~ — — ~ — — ~ — ~ — — -- -- |
`
`l _ _ _ _ _ _ _ _ _ _ _ _ _ _ I _ _ _ _ _ _ _ _ _ _ _ _ _ _.
`
`|
`
`Configure the compensation mechanism
`Configure the compensation mechanism
`I
`I-‘Transform the digitized received signals, received in response to injection ofl
`|Transform the digitized received signals, received in response to injection ofl l
`l
`| the calibration signal, from time-domain to frequency-domain to produce a l
`I
`the calibration signal, from time—domain to frequency-domain to produce a I
`l
`| complex-valued frequency-domain representation of the digitized received I
`I complex-valued frequency—domain representation of the digitized received I
`|
`signals
`w 552
`I
`signals
`\/I7 552
`I — — — — — — — — — — — — — — — — — — — — — — — — — — —— —-—
`I
`I _ _ _ _ _ _ _ _ _ _ _ _ _ _ I _ _ _ _ _ _ _ _ _ _ _ _ _ _.
`I
`| Extract magnitude and phase values from the complex-valued frequency- |
`|
`l
`I Extract magnitude and phase values from the complex-valued frequency— |
`I
`|
`domain representation of the digitized received signals
`\_/l'_\| 554
`l
`I
`domain representation of the digitized received signals
`\_/I"\I 554
`l
`_________ “'IIIIIIIIIIIIIII'
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`_ . . . _ _ . _ _ . _ . _ .
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`btain tar etfre uenc -de endent hase in ormation and tar et ma nitude
`I Obtain target frequency—dependent phase information and target magnitude I
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`response information
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`, ___________ __I____________ __i
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`I Compute phase residuals by subtracting the extracted phase values from I
`I 558
`I Compute phase residuals by subtracting the extracted phase values from I
`I 558
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`I_
`the target frequency-dependent phase information
`\/I7‘
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`the target frequency-dependent phase information
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`559
`Compute magnitude response residuals by determining ratios of the
`|
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`Compute magnitude response residuals by determining ratios of thc-L/l—~I. 559
`I
`I
`| extracted magnitude values with the target magnitude response information I
`l
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`| extracted magnitude values with the target magnitude response information I
`I
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`I ~ _ _ _ _ _ _ _ — . _ _ _ _ _ _ _ . _ _ _ _ _ — _ _ .— ..—
`I
`|
`| Generate a set of complex values from the computed phase residuals and l
`I
`I Generate a set of complex values from the computed phase residuals and I
`I
`I
`magnitude response residuals
`\/I-1‘ 550
`|
`|
`magnitude response residuals
`dis} 560
`I _ _ _ _ _ _ _ _ _ _ _ _ __I _ _ _ _ _ _ _ _ _ _ _ _ __i
`I Transform the set of complex values from frequency~domain to time-domain |
`I
`I Transform the set of complex values from frequency~domain to time-domain I
`I
`l
`Ito produce complex-valued time-domain filter coef?cients corresponding to a] I
`Ito produce complex-valued time—domain filter coefficients corresponding to al
`l
`finite impulse response filter
`I
`I 562
`:
`I
`finite impulse response filter
`\_/IKI‘ 562
`L... * * _ * _ * * * * * * * * * * * * _ * * * * * * * .... ..
`I
`_ _ _ _ _ _ _ _ _ _ _ _ __ __I_ _ _ _ _ _ _ _ _ _ _ _ __ __
`I
`I
`l
`I
`Multiply initial complex~valued time-domain filter coef?cients with a
`|
`I
`Multiply initial complex-valued time—domain filter coefficients with a
`I
`windowing function to produce the complex-valued time-domain filtw 564
`|
`windowing function to produce the complex-valued time—domain filtei/I—~I 564
`......................._......_......_..._.............._......_......._..........._...................................
`coefficients
`I
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`I L __________ _ sos?tsients. __________ _ _' i
`
`I
`I
`
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`
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`L.. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ ...
`
`Figure 5C
`Figure 5C
`
`

`
`US. Patent
`U.S. Patent
`
`Sep. 16,2014
`Sep. 16, 2014
`
`Sheet 13 of 13
`Sheet 13 0f 13
`
`US 8,837,653 B2
`US 8,837,653 B2
`
`@
`E)"
`
`Receive signals at the signal receiver
`Receive signals at the signal receiver
`
`"
`Process the received signals at the signal receiver to produce digitized
`Process the received signals at the signal receiver to produce digitized
`received signals
`received signals
`
`572
`f 572
`
`574
`f 574
`
`f 583
`"
`Compensate the digitized received signals using the compensation
`Compensate the digitized received signals using the compensation
`mechanism to produce compensated signals
`mechanism to produce compensated signals
`
`Compensating the digitized received signals includes
`1
`Compensating the digitized received signals includes
`_ | KT“ 584
`| compensating for signal distortions in a predefined range of |
`compensating for signal distortions in a predefined range of
`|
`I
`l frequencies that includes (L1, E1) 1559 MHz to 1591 MHz, or |
`1 frequencies that includes (L1, E1) 1559 MHz to 1591 MHz, or I
`|1559 MHz to 1610 MHz, or 1211 MHz to 1243, or 1160 MHz tol
`[1559 MHz to 1610 MHz, or 1211 MHz to 1243, or 1160 MHz tol
`|
`1192 MHz (L2, L5)
`|
`1192 MHz (L2, L5)
`
`v
`Process the compensated signals so as to produce a result
`
`f 586
`
`r _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ l
`l
`The result includes a navigation result
`\|__,/'\ 588
`
`t_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
`
`f 576
`Con?gure a compensation mechanism at the signal receiver in accordance
`Configure a compensation mechanism at the signal receiver in accordance
`with digital signals received by the compensation mechanism in response to
`with digital signals received by the compensation mechanism in re