EP2435845A1 - Verfahren und empfänger zum empfang und verarbeiten von altboc-modulierten satellitennavigationssignalen - Google Patents
Verfahren und empfänger zum empfang und verarbeiten von altboc-modulierten satellitennavigationssignalenInfo
- Publication number
- EP2435845A1 EP2435845A1 EP10721797A EP10721797A EP2435845A1 EP 2435845 A1 EP2435845 A1 EP 2435845A1 EP 10721797 A EP10721797 A EP 10721797A EP 10721797 A EP10721797 A EP 10721797A EP 2435845 A1 EP2435845 A1 EP 2435845A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- satellite navigation
- receiver
- prn
- code
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
-
- 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
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
-
- 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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/36—Constructional details or hardware or software details of the signal processing chain relating to the receiver frond end
Definitions
- the invention relates to a method for receiving and processing AltBOC-modulated, in the two subbands E5a and E5b of the so-called E5 frequency band transmitted satellite navigation signals received with a common antenna and in the RF front end thereafter in two physically different and each one Downsampling received signal paths for the E5a and E5b subband separately processed analog and then digitized by means of analog / digital conversion and coherently summed into a complete digital E5 band signal, which is then fed to a digital signal processor in the a code acquisition and a code tracking using PRN reference code sequences generated in the receiver and a tracking of the carrier phase are carried out and from this raw data are determined for the final navigation calculation.
- the invention also relates to a satellite navigation receiver for carrying out the method.
- receivers used in global satellite navigation systems determine their location based on received signals emitted by satellites that are part of a global satellite constellation, eg GPS satellites are.
- the satellites belonging to the GPS satellite constellation transmit their signals at two carrier frequencies L1 and L2, the carrier L1 having a frequency of 1575.42 MHz and the carrier L2 having a frequency of 1227.60 MHz.
- Each carrier is modulated with at least one pseudo random binary code sequence PRN (pseudorandom noise) consisting of a seemingly random, periodically repeating sequence of zeros and ones.
- PRN sequences are also referred to as ranging codes because they allow the estimation of the ranges between receivers and satellites.
- Each satellite uses its own PRN code sequence, which is why the receiver can assign the received signal to the satellite that sent it.
- the receiver calculates the difference between the time at which the satellite transmitted the signal, this information being contained in the signal itself and the time at which the receiver itself received the signal.
- the receiver Based on the time difference, the receiver calculates its own distance (pseudo orange) from the satellite.
- the receiver can calculate its own global spatial position based on the distances determined to at least four satellites.
- the receiver synchronizes a locally generated PRN reference code sequence with the PRN code sequence contained in the received signal.
- the receiver determines the amount of time deviation of the locally generated PRN reference code sequence with respect to the satellite time and calculates the distance.
- the synchronization operations include the acquisition of the satellite's PRN code sequence and its tracking (code tracking).
- the receiver usually tracks the phase of the carrier used by the satellite to broadcast the PRN code sequence and the navigation data (phase tracking).
- Galileo a new satellite navigation system called Galileo is being realized, offering very high accuracy and various services. It operates in three main frequency ranges, namely Ll (1559 - 1591 MHz), E6 (1260 - 1300 MHz) and E5 (1164 - 1214 MHz).
- E5 band consists on the one hand of several sub-signals, which use only one of two subbands E5a (1164-1191 MHz) or E5b (1191-1214 MHz), and on the other hand a signal that uses the complete E5 bandwidth , Fig.l shows the Galileo frequency spectrum in detail.
- Galileo system Details of the Galileo system and related reception methods and receivers are given, for example, in the article by M. Hollreiser: “Galileo Receivers - Challenges and Performance", 12th GAAS Symposium, Amsterdam, 2004, pages 515-518 and in EP 2 012 488 B1 ,
- the satellites of the new Galileo satellite navigation system transmit the signals in the E5a subband (center frequency 1176.45 MHz) and in the E5b subband (center frequency 1207.14 MHz) in the form of a composite signal a center frequency of 1191.795 MHz using a modulation format commonly known as AItBOC (Alternate Binary Offset Carrier).
- AItBOC Alternate Binary Offset Carrier
- Coherent AltBOC processing is realized on the same hardware demodulation architecture as in the independent processing, but with coherent summation of the two components at the digital software level.
- the disadvantage of this known method is that the received Galileo signals in the E5a and E5b sub-bands are disturbed by a variety of influences, e.g. Multipath propagation, ionospheric errors and interferences. These influences are highly frequency selective and can significantly disturb the calibration.
- the satellite navigation signals received via an antenna 1 are first amplified in a low-noise preamplifier (LNA) 2 and then by means of two band filters 3 and 4 on the sub-band E5a / L5 and the sub-band E5b in two independent, physically separate received signal split paths.
- LNA low-noise preamplifier
- the filtered-out signals are then amplified in an RF amplifier 5 or 6 and then filtered by a downsampler 7 or 8, which is operated by means of a local reference oscillator 9, when filtered by a polyphase filter 10 or 11 converted into the intermediate frequency position.
- the received signals converted into the intermediate frequency position are then amplified in each of the two received signal paths by means of an intermediate frequency amplifier 12 or 13 and then fed to a controllable gain VGA amplifier 14 or 15 which is adjusted by means of an AGC control loop by a digital signal processor may be formed in the form of an FPGA (field programmable gate array) A / D board 16 and also contains the analog / digital converters for digitizing the two analog received signals.
- the FPGA A / D board 16 performs a coherent summation of the two digitized signals in the digital domain.
- the digital signal processor includes means for code acquisition and code tracking using a PRN reference code sequence generator provided in the receiver and means for tracking the carrier phase.
- the raw data determined in the digital signal processor are fed to a device for the final navigation calculation.
- the ZF receive signal amplified in the VGA amplifier 14 or 15 is, before being subjected to the analog-to-digital conversion in the FPGA A / D board 16, in each received signal path via an anti-aliasing filter 17 and 18, respectively led.
- the object of the present invention is to provide a method for receiving and processing AltBOC-modulated, transmitted in the two subbands E5a and E5b of the E5 frequency band
- this object is achieved by generating a PRN code calibration signal from the PRN reference code sequences generated in the receiver, which is generated by means of is coupled up to the carrier frequency and then coupled via a directional coupler directly after the antenna into the RF front end as a pseudo-satellite navigation signal, which is tracked as an additional signal in the digital signal processor, which results in a calibration of the RF signal.
- the method of the present invention then uses the PRN reference code sequences generated in the receiver to generate an additional Galileo satellite navigation signal.
- This additional satellite navigation signal is mixed by an up-converter to the corresponding carrier frequency and fed via a directional coupler directly after the antenna in the RF front-end.
- the calibration signal can be continuously “snapped" as an additional Galileo satellite. This allows calibration of the E5a and E5b RF front ends during normal Galileo navigation satellite signal reception.
- the calibration is insensitive to the different and frequency-dependent propagation characteristics (in particular multipath propagation, ionospheric errors and interferences) of the Galileo navigation satellite signals actually received.
- the inventive method with calibration thus makes it possible to combine the two subbands E5a and E5b in the digital domain again coherently to the complete E5 band and to use the AltBOC-modulated signal despite separate analog signal processing.
- both the downconversion in the two analog receive signal paths and the upconversion of the PRN code calibration signal are performed using a common local reference oscillator.
- a satellite navigation receiver which solves this problem for the reception and processing of AltBOC-modulated satellite navigation signals transmitted in the two subbands E5a and E5b of the so-called E5 frequency band with a common antenna and an adjoining RF front-end with two physically different, independent ones each having downmixed receive signal paths for separate analog processing in the E5a and E5b subband and subsequent analog to digital converter followed by the coherent summation device into a complete digital E5 band signal supplied to a digital signal processor, in the facility
- code acquisition and code tracking using a PRN reference code sequence generator provided in the receiver, as well as a means for tracking the carrier phase, and whose raw data determined therefrom are fed to a device for the final navigation calculation characterized in that in that a PRN code calibration signal generated in the PRN reference code sequence generator of the digital signal processor is fed to an upmixer upmixing to the carrier frequency, and that this upconverted PRN code calibration signal is fed to a directional coupler located immediately after the antenna in the RF frontend and
- both the downconverters in the two analog receive signal paths and the upconverter for the PRN code calibration signal are operated by means of a common local reference oscillator.
- the analog / digital converters and the digital signal processor with the PRN code sequence generator are advantageously realized in the form of an FPGA AD board, in which the device for the final navigation calculation can also be included.
- the method according to the present invention can advantageously play a decisive role in the field of receiver development for safety-critical and military applications play. Likewise, the use of this new technical method is of great use for receivers in monitor and control stations.
- FIG. 1 shows in a diagram already explained the specified frequency spectrum for the Galileo satellite navigation system
- FIG 3 shows the block diagram of a Galileo satellite navigation receiver designed according to the present invention for the frequency band E5 consisting of the two subbands E5a and E5b with advantageous calibration capability.
- FIG. 3 shows the block diagram of a receiver according to the present invention for Galileo signal reception in the frequency band E5.
- the satellite navigation signals received via an antenna 19, after being carried out by a directional coupler 20 which will be explained later in its function, are first of all detected in a low-noise preamplifier (LNA) 21. strengthens and then divided by means of two band filters 22 and 23 on the sub-band E5a / L5 and the sub-band E5b in two independent, physically separate receive signal paths.
- LNA low-noise preamplifier
- the filtered-out signals are then amplified in an RF amplifier 24 or 25 and then by means of a down-mixer 26 and 27, which is operated by a local reference oscillator 28, when filtered by a polyphase filter 29 and 30 in the Intermediate frequency position implemented.
- the received signals converted into the intermediate frequency position are then amplified in each of the two received signal paths by means of an intermediate frequency amplifier 31 or 32 and then fed to a controllable gain VGA amplifier 33 or 34, which is controlled by an AGC control loop digital signal processor which may be in the form of an FPGA (Field Programmable Gate Array) A / D board 35 and which also contains the analog / digital converters.
- FPGA Field Programmable Gate Array
- the FPGA A / D board 35 performs a coherent summation of the two digitized signals in the digital domain.
- the digital signal processor includes means for code acquisition and code tracking using a PRN reference code sequence generator provided in the receiver and means for tracking the carrier phase.
- the raw data determined in the digital signal processor are fed to a device for the final navigation calculation.
- the amplified in the VGA amplifier 33 and 34 IF received signal before it is subjected to the analog-to-digital conversion in the FPGA-A / D board 35, in each of the two received signal paths via an anti-aliasing filter 36 and 37 headed.
- the PRN reference code sequence generator included in the receiver in the digital signal processor of the FPGA A / D board 35 is used to generate an additional Galileo satellite navigation signal.
- This additional satellite navigation signal is converted to the corresponding carrier frequency by an up-converter 38, which is operated with the local oscillator 28, and fed via the directional coupler 20 directly after the antenna 19 into the RF front-end.
- the calibration signal is continuously “tracked” as an additional Galileo satellite. This allows calibration of the E5a and E5b RF front ends during normal Galileo navigation satellite reception. As a result of the generation of these pseudo-Galileo navigation satellite signals, the calibration is not susceptible to the different and frequency-dependent propagation characteristics (in particular multipath propagation, ionospheric errors and interferences) of the Galileo navigation satellite signals actually received.
- LNA Low noise amplifier
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009022729.6A DE102009022729B4 (de) | 2009-05-26 | 2009-05-26 | Verfahren und Empfänger zum Empfang und Verarbeiten von AltBOC-modulierten Satellitennavigationssignalen |
| PCT/EP2010/057179 WO2010136462A1 (de) | 2009-05-26 | 2010-05-25 | Verfahren und empfänger zum empfang und verarbeiten von altboc-modulierten satellitennavigationssignalen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2435845A1 true EP2435845A1 (de) | 2012-04-04 |
Family
ID=42555611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10721797A Withdrawn EP2435845A1 (de) | 2009-05-26 | 2010-05-25 | Verfahren und empfänger zum empfang und verarbeiten von altboc-modulierten satellitennavigationssignalen |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9052389B2 (de) |
| EP (1) | EP2435845A1 (de) |
| DE (1) | DE102009022729B4 (de) |
| WO (1) | WO2010136462A1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830407B (zh) * | 2012-09-18 | 2014-04-16 | 桂林电子科技大学 | 北斗接收机抗干扰性能自动测试方法和系统 |
| WO2014047192A1 (en) * | 2012-09-19 | 2014-03-27 | Javad Gnss, Inc. | Antenna lna filter for gnss device |
| CN105116425B (zh) * | 2015-08-21 | 2017-07-28 | 西安空间无线电技术研究所 | 一种并行AltBOC导航信号中频生成方法 |
| CN105717525B (zh) * | 2016-02-23 | 2018-01-05 | 成都华力创通科技有限公司 | Altboc调制的双边带跟踪解调电路及其调解方法 |
| CN113126131B (zh) * | 2021-03-25 | 2022-04-22 | 中国电子科技集团公司第五十四研究所 | 一种超低失真导航信号采集及无混叠分离方法 |
| CN115575986B (zh) * | 2022-12-07 | 2023-03-10 | 北京精测智源导航科技有限公司 | 一种基于精密单点定位的gnss时频接收机 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5535278A (en) * | 1994-05-02 | 1996-07-09 | Magnavox Electronic Systems Company | Global positioning system (GPS) receiver for recovery and tracking of signals modulated with P-code |
| US5604504A (en) * | 1995-08-24 | 1997-02-18 | Alliedsignal Inc. | Air traffic advisory system bearing estimation receiver |
| US5751762A (en) * | 1996-02-15 | 1998-05-12 | Ericsson Inc. | Multichannel receiver using analysis by synthesis |
| US5949372A (en) * | 1997-10-03 | 1999-09-07 | Trimble Navigation Limited | Signal injection for calibration of pseudo-range errors in satellite positioning system receivers |
| US6922167B2 (en) * | 2003-07-14 | 2005-07-26 | European Space Agency | Hardware architecture for processing galileo alternate binary offset carrier (AltBOC) signals |
| EP1787445B1 (de) * | 2004-09-07 | 2008-04-23 | European Space Agency | Verfahren und einrichtung zum demodulieren von signalen des gallileo-alternationsbinäroffsetträgers (altboc) |
| FR2892202B1 (fr) * | 2005-10-14 | 2007-11-30 | Thales Sa | Recepteur gnss a precision amelioree utilisant deux porteuses de signal |
| ES2321240T3 (es) | 2007-07-05 | 2009-06-03 | Fondazione Torino Wireless | Receptor, metodo y producto de programa informatico correspondiente, para desmodular señales con modulacion altboc. |
| FR2942325B1 (fr) * | 2009-02-19 | 2011-03-04 | Thales Sa | Procede de lever d'ambiguite, procede de localisation d'un recepteur par radionavigation comprenant une etape de lever d'ambiguite et recepteur de localisation |
| DE102010001147B4 (de) * | 2010-01-22 | 2016-11-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Mehrfrequenzbandempfänger auf Basis von Pfadüberlagerung mit Regelungsmöglichkeiten |
-
2009
- 2009-05-26 DE DE102009022729.6A patent/DE102009022729B4/de not_active Expired - Fee Related
-
2010
- 2010-05-25 WO PCT/EP2010/057179 patent/WO2010136462A1/de not_active Ceased
- 2010-05-25 US US13/322,099 patent/US9052389B2/en not_active Expired - Fee Related
- 2010-05-25 EP EP10721797A patent/EP2435845A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010136462A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009022729A1 (de) | 2010-12-23 |
| WO2010136462A1 (de) | 2010-12-02 |
| US9052389B2 (en) | 2015-06-09 |
| US20120092212A1 (en) | 2012-04-19 |
| DE102009022729B4 (de) | 2017-07-06 |
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