US20080159198A1 - Boc signal acquisition and tracking method and apparatus - Google Patents

Boc signal acquisition and tracking method and apparatus Download PDF

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Publication number
US20080159198A1
US20080159198A1 US11/616,610 US61661006A US2008159198A1 US 20080159198 A1 US20080159198 A1 US 20080159198A1 US 61661006 A US61661006 A US 61661006A US 2008159198 A1 US2008159198 A1 US 2008159198A1
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Prior art keywords
boc
signal
code
subcarrier
correlation
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US11/616,610
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English (en)
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Chun-Nan Chen
Kun-Tso Chen
Jui-Ming Wei
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MediaTek Inc
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MediaTek Inc
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Priority to US11/616,610 priority Critical patent/US20080159198A1/en
Assigned to MEDIATEK INC. reassignment MEDIATEK INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHEN, CHUN-NAN, CHEN, KUN-TSO, WEI, JUI-MING
Priority to TW096108605A priority patent/TWI337027B/zh
Priority to CN201210226483.8A priority patent/CN102780508B/zh
Priority to CN2007100936134A priority patent/CN101212234B/zh
Priority to DE102007016565.1A priority patent/DE102007016565B4/de
Publication of US20080159198A1 publication Critical patent/US20080159198A1/en
Priority to US12/757,994 priority patent/US8374223B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7085—Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers
    • H04L27/2042—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers with more than two phase states
    • H04L27/2046—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers with more than two phase states in which the data are represented by carrier phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70715—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with application-specific features

Definitions

  • the present invention relates to processing of binary offset carrier (BOC) modulated signals (simply referred to as BOC signal hereinafter), more particularly, to a method and apparatus for processing BOC signals in acquisition and tracking modes of a satellite navigation receiver.
  • BOC binary offset carrier
  • GNSS Global Navigation Satellite System
  • LBS location based service
  • wireless multimedia communication and broadcasting signals is becoming an expectation.
  • multi-specification LBS location based service
  • a receiver able to support multi-mode receiving for GNSS signals can enhance locating precision and access to more services.
  • different signal frequency bands support different services. As more and more bands need to be supported, band overlapping occurs.
  • GPS is the U.S. navigation satellite system, which is a network of satellites continuously transmits high-frequency radio signals.
  • the signals carry time and distance information that is receivable by a GPS receiver, so that a user can pinpoint the position thereof on the earth.
  • Galileo the emerging European satellite navigation system, offers higher signal power and more robust modulation that will enable users to receive weak signals even in difficult environments. When combined, Galileo and GPS will offer twice the number of satellite sources as currently available. This provides redundancy as well as greater availability for the user.
  • the combination of GPS and Galileo basically has four bands, excluding SAR (Safe and Rescue) service. GPS and Galileo systems share some signal bands. That is, GPS and Galileo share some central frequencies and send signals on the same ones of carriers.
  • BOC Binary offset carrier modulation
  • the BOC modulation is done by multiplying a pseudo-random noise (PRN) spreading coded signal (simply referred to as PRN coded signal hereinafter) with a square wave subcarrier (SC).
  • PRN pseudo-random noise
  • SC square wave subcarrier
  • the SC has a frequency which is multiple of the code rate of the PRN spreading code.
  • FIG. 1 is a waveform diagram showing the BOC modulation.
  • the BOC-sine (simply referred to as BOC) signal is generated by mixing a SC-sine and a PRN coded signal, while the BOC-cos (also referred to as QBOC, where Q indicates “quadrature-phase”.) is generated by mixing an SC-cos and the PRN coded signal.
  • the BOC signal has a symmetric split spectrum with two main lobes shifted from the center frequency by the frequency of the subcarrier.
  • the characteristics of the BOC signal are dependent on the spreading code chip rate, the subcarrier frequency, and the subcarrier phasing within one PRN code chip.
  • the common notation for a BOC-modulated signals in the GNSS field is represented as BOC(f c , f s ), where f c is the code chip rate, and f s is the frequency of the subcarrier. Both f c and f s are usually represented as a multiple of the reference frequency 1.023 MHz.
  • the BOC signal can also be represented as BOC(n,m), where n is the multiple of 1.023 MHz; for the PRN code chip rate f c , and m is the multiple of 1.023 MHz for the subcarrier f s .
  • FIG. 1 is a diagram showing autocorrelation of BOC(1,1). That is, BOC(1,1) correlates with BOC(1,1). As shown, there are two troughs at both sides of the main peak in the middle. To calculate correlation power, square of correlation is usually used. Accordingly, the two troughs will cause two secondary peaks in view of correlation power.
  • Such secondary peaks may cause a problem of mis-lock. That is, a receiver may lock the secondary peak rather than the main peak, and therefore resulting in erroneous tracking. A significant deviation of approximately 150 m would occur in the range measurement. Such an error is unacceptable in navigation.
  • the width of the main lobe (main peak) of the BOC correlation result influences the performance of the receiver in acquisition and tracking. If the main lobe is narrow, it is good for tracking and position because a more accurate code phase can be tracked. However, a narrow main lobe makes it difficult to acquire the signal because the narrow correlation function leads to a finer code phase searching space, which needs longer acquisition time.
  • An objective of the present invention is to provide a BOC signal acquisition and tracking apparatus.
  • the apparatus comprises a carrier unit generating a carrier; a code unit generating a plurality of subcarriers including at least a BOC subcarrier, a BOC-cos subcarrier, for example, as well as a PRN code, and outputting the BOC subcarrier as well as one of BOC-cos subcarrier and the PRN code; and a code delay estimator receiving a signal, removing a carrier component from said signal by using said carrier from the carrier unit, generating a BOC signal for the received signal by using the BOC subcarrier and generating a BOC-cos signal or a PRN coded signal for the signal by using one of the BOC-cos subcarrier and the PRN code, calculating an autocorrelation of the BOC signal and a cross-correlation of the BOC signal and one of the BOC-cos signal and the PRN coded signal, and combining said autocorrelation and said
  • the apparatus has a controller controlling the carrier unit, the code unit and the code estimator.
  • the controller controls the code unit to output the BOC-cos subcarrier or the PRN code.
  • the code estimator can properly generate a combined correlation based on built-in algorithms.
  • Another objective of the present invention is to provide a BOC signal acquisition and tracking method.
  • the method comprising receiving a signal; generating a carrier; generating subcarriers including at least a BOC subcarrier, a BOC-cos subcarrier, for example, as well as a PRN code; outputting the BOC subcarrier and selecting to output one of the BOC subcarrier and said PRN code; removing a carrier component from the received signal by using said carrier; generating a BOC signal for the signal by using the BOC subcarrier; generating one of a BOC-cos signal and a PRN coded signal for the signal by using one of the BOC-cos subcarrier and the PRN code; calculating an autocorrelation of the BOC signal; calculating a cross-correlation of the BOC signal and one of the BOC-cos signal and the PRN code signal; and combining the autocorrelation and the cross-correlation to generate a combined correlation.
  • the BOC subcarrier and BOC-cos subcarrier are output; while in signal tracking mode, the BOC subcarrier and the PRN code are output. Accordingly, the combined correlation can be properly generated based on built-in algorithms.
  • FIG. 1 is a waveform diagram showing generation of BOC and BOC-cos signals
  • FIG. 2 shows correlation result of BOC(1,1) autocorrelation
  • FIG. 3 shows correlation powers of cross-correlation of BOC(1,1)/PRN code, autocorrelation of BOC(1,1) and a combined correlation of the both with a specific coefficient
  • FIG. 4 shows correlation powers of autocorrelation of BOC(1,1) cross-correlation of BOC(1,1)/QBOC(1,1), and a combined correlation of the both with a specific coefficient
  • FIG. 5 is a block diagram showing a BOC signals acquisition and tracking apparatus in accordance with the present invention.
  • a method to remove the secondary peaks is a combined correlation function.
  • correlation power of autocorrelation of BOC(1,1) i.e. BOC(1,1) correlates with BOC(1,1)
  • BOC(1,1) provides curve with a main peak and two side peaks (or secondary peaks).
  • cross-correlation of BOC(1,1) and PRN code provides a curve with two side peaks but without the main peak.
  • R combi R 2 BOC/BOC ( ⁇ ) ⁇ R 2 BOC/PRN ( ⁇ ) (1)
  • ⁇ is code delay in chips, and ⁇ is a variable coefficient.
  • BOC (1,1) is used and ⁇ is 1.4.
  • the combined correlation power curve has a narrower main lobe with a significantly high peak, but has no side peaks. Such a function is preferably applied in signal tracking for the sake of better accuracy.
  • the correlation curve has a wide main lobe.
  • a method to obtain a wide correlation function while reduce side peaks is combining BOC autocorrelation and cross-correlation of BOC and BOC-cos (QBOC).
  • FIG. 4 shows correlation power curves of BOC(1,1)/BOC(1,1) and BOC(1,1)/QBOC(1,1). By adding the both with a proper coefficient, a resultant combined correlation with a wide main lobe can be obtained.
  • the combining function can be expressed as:
  • R combi R 2 BOC/BOC ( ⁇ )+ ⁇ R 2 BOC/QBOC ( ⁇ ) (2)
  • ⁇ is code delay in chips, and ⁇ is a variable coefficient.
  • BOC(1,1) and QBOC(1,1) are used and ⁇ is 0.8.
  • the combined correlation has a wide-shaped main lobe. Although there still are side peaks existing, the side peaks have been somewhat reduced and smoothed. Such a function is suitable for signal acquisition.
  • the coefficient ( ⁇ , ⁇ ) is variable as desired.
  • FIG. 5 is a block diagram schematically showing a BOC signal acquisition and tracking apparatus in accordance with the present invention.
  • the apparatus can be implemented as a portion of a GNSS signal receiver (e.g. a GPS receiver).
  • the apparatus receives incoming IF data from an RF frond end of a GNSS receiver, for example.
  • Reference number 10 indicates a carrier unit, which provides a carrier signal to carrier mixers 102 and 104 to remove IF component from the data.
  • the carrier signal can be generated by a local oscillator, which is implemented by a carrier numeral controlled oscillator 12 .
  • Reference number 14 indicates a phase shifter.
  • the IF-removed signal in I and Q channels are then fed to mixers 202 and 204 , 206 and 208 , respectively.
  • Block 20 is referred to as a code unit.
  • the code unit 20 comprises a code numeral controlled oscillator 22 for providing a code signal, a PRN code generator 24 receiving the code signal from the code NCO 22 to generate the PRN code, and a pulse shaping unit 25 .
  • the pulse shaping unit 25 receives the PRN code to generate a BOC subcarrier and BOC-cos subcarrier by using the PRN code.
  • the subcarriers are generated by a subcarrier generator 252 in the pulse shaping unit 25 .
  • the pulse shaping unit 25 outputs the BOC subcarrier as well as one of the BOC-cos (QBOC) subcarrier and the PRN code.
  • the pulse shaping unit 25 has a multiplexer 254 receiving the BOC-cos (QBOC) subcarrier and the PRN code, and selecting to output one of the both.
  • the BOC subcarrier is provided to the mixers 202 and 206 , so that BOC signal is generated in I and Q channels.
  • the selected output from the multiplexer 254 is fed to the mixers 204 and 208 .
  • a BOC-cos (QBOC) signal is generated.
  • the selected output is the PRN code
  • a PRN coded signal is generated.
  • the outputs of the mixers 202 , 204 , 206 , 208 which are referred to as code mixers, are fed into integration and dump units 302 , 304 , 306 , 308 , respectively, to be integrated and dumped.
  • the combination unit 40 synthesizes the integration results by combining the integration results from units 302 and 304 to obtain combined correlation in I channel and combining the integration results from units 306 and 308 to obtain combined correlation in Q channel.
  • the combination unit 40 combines the integration results based on the equations (1) or (2).
  • the coefficient ⁇ or ⁇ is determined in the combination unit 40 in the present embodiment. However, the coefficient ⁇ or ⁇ can also be externally provided to the combination unit 40 .
  • An output of the combination unit 40 is fed to a discriminator 50 , which outputs a tracking error from the received correlation to feed back to the carrier unit 10 and code unit 20 , so that these units can execute proper adjustments.
  • the mixers 102 , 104 , 202 , 204 , 206 , 208 , integration and dump units 302 , 304 , 306 , 308 , combination unit 40 and discriminator 50 compose a code delay estimator 100 .
  • the apparatus in accordance with the present invention further has a controller 60 .
  • the controller 60 controls the carrier NCO 12 , the code NCO 22 and the multiplexer 254 .
  • the controller 60 controls the multiplexer 254 to output the BOC-cos signal in signal acquisition mode while controls the multiplexer 254 to output the PRN code in signal tracking mode.
  • the controller 60 can receive an external command and controls the respective units accordingly.
  • the coefficient ⁇ or ⁇ used in the combination unit 40 is determined by the controller 60 .
  • BOC signal BOC signal
  • BOC-cos signal QBOC signal
  • PRN code PRN code
  • BOC signal BOC signal
  • BOC-cos signal BOC-cos signal
  • PRN code PRN code
  • other signals combination such as a BOC signal with a BOC harmonic signal and/or BOC-cos harmonic signal thereof
  • the so called BOC harmonic signal indicates BOC of a multiple of f s
  • a double frequency harmonic subcarrier of the BOC subcarrier is represented as BOC-sin(2f s )
  • BOC-cos(2f s ) BOC-cos(2f s
  • the code unit 20 outputs PRN code, BOC subcarrier and BOC-cos subcarrier.
  • more than the PRN code and the above two subcarriers can be generated and output by the code unit 20 , such as harmonic of the BOC and BOC-cos subcarriers.
  • the multiplexer 254 can outputs selected one or more among the PRN code and a plurality of subcarriers under the control of controller 60 .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Radar Systems Or Details Thereof (AREA)
US11/616,610 2006-12-27 2006-12-27 Boc signal acquisition and tracking method and apparatus Abandoned US20080159198A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US11/616,610 US20080159198A1 (en) 2006-12-27 2006-12-27 Boc signal acquisition and tracking method and apparatus
TW096108605A TWI337027B (en) 2006-12-27 2007-03-13 Boc signal acquisition and tracking method and apparatus
CN201210226483.8A CN102780508B (zh) 2006-12-27 2007-03-29 双相偏置载频信号获取和追踪的方法及装置
CN2007100936134A CN101212234B (zh) 2006-12-27 2007-03-29 双相偏置载频信号获取和追踪的方法及装置
DE102007016565.1A DE102007016565B4 (de) 2006-12-27 2007-04-06 Verfahren und Vorrichtung für das Erfassen und Verfolgen von BOC-Signalen
US12/757,994 US8374223B2 (en) 2006-12-27 2010-04-10 BOC signal acquisition and tracking method and apparatus

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US20090121928A1 (en) * 2007-11-12 2009-05-14 Qualcomm Incorporated Suppression of Multipath Effects for Received SPS Signals
US20090207891A1 (en) * 2008-02-20 2009-08-20 Qualcomm Incorporated Multipath detection for received sps signal
FR2952439A1 (fr) * 2009-11-10 2011-05-13 Centre Nat Etd Spatiales Procede d'acquisition de signaux de radionavigation a code d'etalement a periode quasi-infinie
JP2012058035A (ja) * 2010-09-07 2012-03-22 Japan Radio Co Ltd 衛星信号のコード追尾装置
US20140125522A1 (en) * 2011-07-19 2014-05-08 Research & Business Foundation Sungkyunkean Univerversity Method of generating correlation function with no side-peak and system for tracking binary offset carrier signal
CN112213748A (zh) * 2020-09-28 2021-01-12 四川九洲北斗导航与位置服务有限公司 一种boc信号捕获方法、信号接收机及信号捕获系统

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CN101571583B (zh) * 2009-04-13 2011-09-28 北京航空航天大学 一种可接收处理boc(1,1)信号的相关器
CN102209056B (zh) * 2011-04-15 2013-06-19 华中科技大学 一种导航信号调制方法
US8942157B2 (en) * 2012-10-26 2015-01-27 Deere & Company Receiver and method for receiving a composite signal
CN103532641B (zh) * 2013-09-17 2015-03-18 华中科技大学 一种用于卫星导航系统的射频信号质量评估方法
US9191061B2 (en) 2014-01-10 2015-11-17 Deere & Company Method and receiver for receiving a composite signal
CN104181556B (zh) * 2014-08-19 2017-02-15 哈尔滨工程大学 一种基于重叠差分循环相干积分的boc调制信号捕获方法
CN104199064B (zh) * 2014-09-12 2017-03-22 重庆邮电大学 基于相关波动的boc信号参数盲估计方法
US9929887B1 (en) * 2016-09-28 2018-03-27 The Mitre Corporation Backward-compatible signal variations for data augmentation
CN111884676A (zh) * 2020-07-13 2020-11-03 电子科技大学 一种直接序列扩频接收机伪码同步的快速实现装置及方法

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US20080069187A1 (en) * 2006-09-19 2008-03-20 Media Tek Inc. Boc signal acquisition and tracking method and apparatus
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US20090121928A1 (en) * 2007-11-12 2009-05-14 Qualcomm Incorporated Suppression of Multipath Effects for Received SPS Signals
US8571088B2 (en) * 2007-11-12 2013-10-29 Qualcomm Incorporated Suppression of multipath effects for received SPS signals
US20090207891A1 (en) * 2008-02-20 2009-08-20 Qualcomm Incorporated Multipath detection for received sps signal
US9285478B2 (en) * 2008-02-20 2016-03-15 Qualcomm Incorporated Multipath detection for received SPS signal
FR2952439A1 (fr) * 2009-11-10 2011-05-13 Centre Nat Etd Spatiales Procede d'acquisition de signaux de radionavigation a code d'etalement a periode quasi-infinie
EP2323271A1 (fr) 2009-11-10 2011-05-18 Centre National d'Etudes Spatiales Procédé d'acquisition de signaux de radionavigation à code d'étalement à période quasi-infinie
US20110129002A1 (en) * 2009-11-10 2011-06-02 Centre National D'etudes Spatiales Method for the acquisition of radionavigation signals carrying spreading code with a quasi-infinite period
US9063224B2 (en) 2009-11-10 2015-06-23 Centre National D'etudes Spatiales Method for the acquisition of radionavigation signals carrying spreading code with a quasi-infinite period
JP2012058035A (ja) * 2010-09-07 2012-03-22 Japan Radio Co Ltd 衛星信号のコード追尾装置
US20140125522A1 (en) * 2011-07-19 2014-05-08 Research & Business Foundation Sungkyunkean Univerversity Method of generating correlation function with no side-peak and system for tracking binary offset carrier signal
US9817128B2 (en) * 2011-07-19 2017-11-14 Research & Business Foundation Sungkyunkwan University Method of generating correlation function with no side-peak and system for tracking binary offset carrier signal
CN112213748A (zh) * 2020-09-28 2021-01-12 四川九洲北斗导航与位置服务有限公司 一种boc信号捕获方法、信号接收机及信号捕获系统

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DE102007016565A1 (de) 2008-07-10
US8374223B2 (en) 2013-02-12
CN102780508B (zh) 2014-09-10
CN101212234A (zh) 2008-07-02
TW200828904A (en) 2008-07-01
CN102780508A (zh) 2012-11-14
DE102007016565B4 (de) 2014-10-16
CN101212234B (zh) 2012-08-29

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