CN105699989A - Method for Beidou RDSS terminal Doppler frequency compensation and terminal - Google Patents
Method for Beidou RDSS terminal Doppler frequency compensation and terminal Download PDFInfo
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- 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
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- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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Abstract
The invention provides a method for Beidou RDSS terminal Doppler frequency compensation. The method includes the following steps: when the terminal is in a static state, local crystal oscillator frequency offset of the terminal is calculated; when the terminal moves at high speed, the local crystal oscillator frequency offset and a carrier frequency control word output by and a digital receiving circuit (4) are utilized to calculate an emitting code NCO frequency control word and emitting PLL parameters, the emitting code NCO frequency control word is utilized to control emitting code NCO output, and the emitting PLL parameters are utilized to control BPSK modulation. After adoption of the abovementioned technical scheme, a user terminal radio frequency circuit is the same as an ordinary user terminal circuit, can use a market mainstream RDSS radio frequency chip, and a user terminal can stably and reliably realize an RDSS service request under a high dynamic condition only by modification of software. Compared with the prior art, the technical scheme has the advantages of simple circuit structure, strong universality, small size and low power consumption.
Description
Technical field
The present invention relates to a kind of method of Big Dipper RDSS terminal Doppler frequency compensation and terminal, especially a kind of Big Dipper RDSS height dynamic terminal launches the method for signal Doppler frequency compensation and corresponding terminal。
Background technology
The Beidou satellite navigation pilot system in 1994 that continues starts to build so far, Beidou satellite navigation system RDSS (RadioDeterminationSatelliteService, RDSS radio determination satellite service) subsystem application in every profession and trade reaches its maturity, and creates Social and economic benef@widely。Its distinctive quick location, position report and short message communication function, its application in Aeronautics and Astronautics field is made also day by day to increase, but the high-speed motion of the carriers such as aircraft makes the signal that Big Dipper RDSS height dynamic subscriber's terminal is launched introduce huge Doppler frequency when being received by RDSS subsystem, the service request causing user terminal cannot be normally received by RDSS subsystem, thus causing user terminal normally to position and two-way communication。Therefore Doppler frequency must be compensated by Big Dipper RDSS height dynamic subscriber's terminal in the transmitted signals。
Application publication number be 102223164A Chinese patent " for high dynamic process frequency difference update the system realize method " technical scheme that proposes uses 3 crystal oscillators, counting method is adopted to measure the Doppler frequency received in signal, adjust and launch code clock DDS frequency control word and launch BPSK modulation circuit local crystal oscillator frequency, it is achieved launch signal Doppler frequency compensation。But, counting method has bigger delay, there is the problem compensated not in time when superelevation is dynamic；Meanwhile, 3 crystal oscillators are adopted to too increase the complexity of circuit。Additionally, the program utilizes 10M crystal oscillator as frequency reference, and do not consider that 10M crystal oscillator there is also frequency deviation；It compensates transmitting carrier Doppler frequency is by adjusting the realization of transmitting crystal oscillator frequency。
Application publication number is that the technical scheme that the Chinese patent " a kind of Doppler based on DDS quickly compensates circuit and method " of CN104252000A proposes uses 1 high stability crystal oscillator, the Doppler frequency received in signal is calculated according to carrier tracking loop output, adjust and launch PN code clock DDS and emission medium-frequency carrier wave DDS frequency control word, form digital intermediate frequency BPSK and modulate signal, send to transmitting antenna after digital-to-analogue conversion, filtering, amplification, up-conversion and power amplification process。This technology has the advantage that compensation is real-time, but, the program does not consider the frequency deviation of crystal oscillator, can introduce extra Doppler frequency deviation on the contrary when crystal oscillator frequency deviation is bigger；Meanwhile, BPSK modulation circuit is launched complicated, it is impossible to use the RDSS radio frequency chip that market is conventional, it is impossible to reach the purpose of miniaturization and low-power consumption；It compensates launches carrier Doppler frequency by adjusting the realization of digital waveform molding device DDS incoming frequency control word。
Summary of the invention
The purpose of the present invention is to propose to a kind of technical scheme suitable in Big Dipper RDSS height dynamic subscriber's terminal transmission signal Doppler frequency compensation, this technical scheme can use market mainstream RDSS radio frequency chip, have that circuit structure is simple, volume is little, the advantage of low-power consumption, it is possible to resolve the radiating circuit existing for prior art is complicated, Doppler frequency compensation is delayed, do not consider the practical application defect such as frequency deviation of crystal oscillator。
The present invention provides a kind of method of Big Dipper RDSS terminal Doppler frequency compensation, and described method includes, and when described terminal remains static, calculates the local crystal oscillator frequency deviation of described terminal；When described terminal high-speed moves, utilize described local crystal oscillator frequency deviation and the carrier frequency control word of digital received circuit output, calculate and launch code NCO frequency control word and launch PLL parameter, utilize described transmitting code NCO frequency control word to control described transmitting code NCO output, utilize described transmitting PLL state modulator BPSK modulation。
The present invention also provides for a kind of Big Dipper RDSS terminal, described terminal includes, reception antenna, down coversion, ADC, digital received circuit, local crystal oscillator frequency offset calculation unit, launch compensation parameter calculation unit, launch code NCO, spread spectrum, BPSK modulates, PA, transmitting antenna, described digital received circuit outgoing carrier frequency control word and code frequency control word give described local crystal oscillator frequency offset calculation unit and described transmitting compensation parameter calculation unit, described local crystal oscillator frequency offset calculation unit output local crystal oscillator frequency deviation gives described transmitting compensation parameter calculation unit, the output of described transmitting compensation parameter calculation unit is launched code NCO frequency control word and launches PLL parameter respectively to described transmitting code NCO and described BPSK modulation, described transmitting code NCO outputs signals to described spread spectrum, described spread spectrum output spreading code is modulated to described BPSK。
Further, when described terminal remains static, described local crystal oscillator frequency offset calculation unit calculates the local crystal oscillator frequency deviation of described terminal；When described terminal high-speed moves, utilizing described local crystal oscillator frequency deviation and the carrier frequency control word of digital received circuit output, described transmitting compensation parameter calculation unit calculates described transmitting code NCO frequency control word and described transmitting PLL parameter。
Further, described local crystal oscillator frequency offset calculation unit utilizes the timing signal from GNSS receiver output to calculate the local crystal oscillator frequency deviation of described terminal。
After adopting prior art scheme, user terminal radio circuit is identical with general subscriber terminal circuit, can use market mainstream RDSS radio frequency chip, only need to revise software and user terminal can be made reliablely and stablely to realize RDSS service request under high dynamic condition。Compared with prior art, the technical program has that circuit structure is simple, universal strong, volume are little, the advantage of low-power consumption。
Accompanying drawing explanation
Fig. 1 is the Big Dipper RDSS terminal frame construction drawing of the present invention；
Fig. 2 is the method ultimate principle flow chart of the Big Dipper RDSS terminal Doppler frequency compensation of the present invention。
Detailed description of the invention
Below in conjunction with better embodiment therein, the present invention program is described in detail。
Fig. 1 is the Big Dipper RDSS terminal frame construction drawing of the present invention。The basic module that this programme comprises comprises reception antenna 1, down coversion 2, ADC (AnalogDigitalConverter, analog digital conversion) 3, digital received circuit 4, local crystal oscillator frequency offset calculation unit 5, launch compensation parameter calculation unit 6, launch code NCO (NumericallyControlledOscillator, digital controlled oscillator) 7, spread spectrum 8, BPSK (BinaryPhaseShiftKey, binary phase shift keying) modulate 9, PA (PowerAmplifier, power amplifier) 10, transmitting antenna 11, its detailed description of the invention is as shown in Figure 1。Reception antenna 1 output is connected with down coversion 2 input, down coversion 2 output is connected with ADC3 input, ADC3 output is connected with digital received circuit 4 input, the carrier frequency control word of digital received circuit 4 output and code frequency control word are all connected with local crystal oscillator frequency offset calculation unit 5 and transmitting compensation parameter calculation unit 6 input, GNSS (GlobalNavigationSatelliteSystem simultaneously, GLONASS) receiver output timing signal be connected with local crystal oscillator frequency offset calculation unit 5 input, the local crystal oscillator frequency deviation of local crystal oscillator frequency offset calculation unit 5 output is connected with launching compensation parameter calculation unit 6 input, transmitting code NCO frequency control word and the transmitting PLL parameter of launching compensation parameter calculation unit 6 output are modulated 9 inputs with transmitting code NCO7 and BPSK respectively and are connected, launch code NCO7 output to be connected with spread spectrum 8 input, the spreading code of spread spectrum 8 output is modulated 9 inputs and is connected with BPSK, BPSK modulation 9 output is connected with PA10 input, PA10 output is connected with transmitting antenna 11 input。
Fig. 2 is the method ultimate principle flow chart of the Big Dipper RDSS terminal Doppler frequency compensation of the present invention。The enforcement of this method mainly divides 3 steps to carry out, as shown in Figure 2。
In step 21, carrier frequency control word or code frequency control word that user terminal start utilizes digital received circuit 4 to export when remaining static or utilize GNSS (GlobalNavigationSatelliteSystem, GLONASS) receiver output timing signal, calculate user terminal local crystal oscillator frequency deviation；
In step 22, utilize carrier frequency control word or the code frequency control word of the calculated local crystal oscillator frequency deviation of step 21 and digital received circuit 4 output, calculate and launch code NCO frequency control word；
In step 23, utilize carrier frequency control word or the code frequency control word of the calculated local crystal oscillator frequency deviation of step 21 and digital received circuit 4 output, calculate and launch PLL parameter。
Embodiment one:
1) after the RDSS navigation signal that 5 geostationary orbit (GEO) satellites of Beidou satellite navigation system (being called for short BDS) space constellation are broadcast is received by user terminal reception antenna 1, filter and is amplified, downconverted 2 carry out down coversion, amplification and Filtering Processing, carry out analog digital conversion again through ADC3, enter digital received circuit 4 and be navigated the catching of signal, tracking etc. and process。
2) down coversion 2, ADC3, digital received circuit 4, transmitting code NCO7, spread spectrum 8, BPSK modulation 9 all use same frequency source, and this frequency source selects low acceleration sensitivity crystal oscillator。
3) if remaining static when user terminal is started shooting, then local crystal oscillator frequency offset calculation unit 5 may utilize the code frequency control word of digital received circuit 4 output and calculates now user terminal local crystal oscillator frequency deviation: (formula 1)
It is local crystal oscillator frequency deviation, FCWcode_rxIt is the code frequency control word of digital received circuit 4 code tracking loop output, fPNIt is spread-spectrum code rate, fs_REFBeing that digital received circuit 4 works nominal frequency, N is 4 yards of NCO phase widths of digital received circuit。
If GNSS (GlobalNavigationSatelliteSystem can be obtained, GLONASS) receiver output timing signal, local crystal oscillator frequency offset calculation unit 5 utilizes counting method or other frequency measurement method to calculate user terminal local crystal oscillator frequency deviation during carrier high-speed motion in real time；Otherwise, utilize the characteristic that low acceleration sensitivity crystal oscillator is insensitive to acceleration stress, calculated crystal oscillator frequency deviation during use start can be similar to。
Counting method be the double timing signal interval inside counting utilizing tested frequency source that receiver is exported to calculate local crystal oscillator frequency deviation, see formula 2:
Wherein, T is double timing signal interval, and K is count value, fosc_REFIt it is tested frequency source nominal frequency。
4) when carrier high-speed motion, launch compensation parameter calculation unit 6 and utilize local crystal oscillator frequency deviation that local crystal oscillator frequency offset calculation unit 5 calculates and the code frequency control word that digital received circuit 4 exports, calculate and launch code NCO frequency control word and launch PLL parameter, in order to compensate transmitting code Doppler frequency and to launch carrier Doppler frequency。
The frequency control word computational methods launching code NCO7 input are shown in formula 3:
FCWcode_txIt is the frequency control word launching code NCO7 input, fPNIt is spread-spectrum code rate, fs_REFBeing digital received circuit 4 and transmitting code NCO7 work nominal frequency, N launches code NCO7 and 4 yards of NCO phase widths of digital received circuit, FCWcode_rxIt is the code frequency control word of digital received circuit 4 output,It it is local crystal oscillator frequency deviation。
Launch PLL calculation method of parameters and see formula 4:
(formula 4)
M makes transmitting PLL input and output clock frequency meet(wherein fPLL_inFor launching PLL input clock frequency, fPLL_outFor launch PLL output clock frequency, M and R is integer) transmitting PLL frequency dividing ratio parameter, fPNIt is spread-spectrum code rate, fs_REFBeing digital received circuit 4 and transmitting code NCO7 work nominal frequency, N launches code NCO7 and 4 yards of NCO phase widths of digital received circuit, FCWcode_rxIt is the code frequency control word of digital received circuit 4 output,It is local crystal oscillator frequency deviation, M0It is launch PLL nominal parameters, operatorRepresent and round downwards。
5) spread spectrum 8 is under the code clock beat launching code NCO7 output, and transmitting information and spreading code are carried out spreading operations。
6) BPSK modulation 9 receives the transmitting PLL parameter launching compensation parameter calculation unit 6 output, adjust and launch PLL frequency dividing ratio, and realize launching the BPSK modulation of signal, after PA10 power amplification, launched by transmitting antenna 11。
Embodiment two:
1) after the RDSS navigation signal that 5 geostationary orbit (GEO) satellites of Beidou satellite navigation system (being called for short BDS) space constellation are broadcast is received by user terminal reception antenna 1, filter and is amplified, downconverted 2 carry out down coversion, amplification and Filtering Processing, carry out analog digital conversion again through ADC3, enter digital received circuit 4 and be navigated the catching of signal, tracking etc. and process。
2) down coversion 2, ADC3, digital received circuit 4, transmitting code NCO7, spread spectrum 8, BPSK modulation 9 all use same frequency source, and this frequency source selects low acceleration sensitivity crystal oscillator。
3) if remaining static when user terminal is started shooting, then local crystal oscillator frequency offset calculation unit 5 may utilize the carrier frequency control word of digital received circuit 4 output and calculates now user terminal local crystal oscillator frequency deviation:
This formula is applicable for use with the radio frequency reception channel of mixing scheme under low local oscillator,It is local crystal oscillator frequency deviation, fs_REFBeing that digital received circuit 4 works nominal frequency, N is digital received circuit 4 carrier wave NCO phase width, fIF_REFIt is the nominal carrier frequency of digital medium-frequency signal, fdown_outIt is departures downlink nominal carrier frequency, FCWcarrier_rxIt it is the carrier frequency control word of digital received circuit 4 carrier tracking loop output。
If GNSS (GlobalNavigationSatelliteSystem can be obtained, GLONASS) receiver output timing signal, local crystal oscillator frequency offset calculation unit 5 utilizes counting method (referring to formula 2) or other frequency measurement method to calculate user terminal local crystal oscillator frequency deviation during carrier high-speed motion in real time；Otherwise, utilize the characteristic that low acceleration sensitivity crystal oscillator is insensitive to acceleration stress, calculated crystal oscillator frequency deviation during use start can be similar to。
4) when carrier high-speed motion, launch compensation parameter calculation unit 6 and utilize local crystal oscillator frequency deviation that local crystal oscillator frequency offset calculation unit 5 calculates and the carrier frequency control word that digital received circuit 4 exports, calculate and launch code NCO frequency control word and launch PLL parameter, in order to compensate transmitting code Doppler frequency and to launch carrier Doppler frequency。
The frequency control word computational methods launching code NCO7 input are shown in formula 6:
This formula is applicable for use with the radio frequency reception channel of mixing scheme under low local oscillator, FCWcode_txIt is the frequency control word launching code NCO7 input, fPNIt is spread-spectrum code rate, fs_REFBeing digital received circuit 4 and transmitting code NCO7 work nominal frequency, N launches code NCO7 and digital received circuit 4 carrier wave NCO phase width,It is local crystal oscillator frequency deviation, fIF_REFIt is the nominal carrier frequency of digital medium-frequency signal, fdown_outIt is departures downlink nominal carrier frequency, FCWcarrier_rxIt it is the carrier frequency control word of digital received circuit 4 output。
Launch PLL calculation method of parameters and see formula 7:
(formula 7)
This formula is applicable for use with the radio frequency reception channel of mixing scheme under low local oscillator, and M makes transmitting PLL input and output clock frequency meet(wherein fPLL_inFor launching PLL input clock frequency, fPLL_outFor launch PLL output clock frequency, M and R is integer) transmitting PLL frequency dividing ratio parameter, fPNIt is spread-spectrum code rate, fs_REFBeing digital received circuit 4 and transmitting code NCO7 work nominal frequency, N launches code NCO7 and digital received circuit 4 carrier wave NCO phase width,It is local crystal oscillator frequency deviation, fIF_REFIt is the nominal carrier frequency of digital medium-frequency signal, fdown_outIt is departures downlink nominal carrier frequency, FCWcarrier_rxIt is the carrier frequency control word of digital received circuit 4 output, M0It is launch PLL nominal parameters, operatorRepresent and round downwards。
5) spread spectrum 8 is under the code clock beat launching code NCO7 output, and transmitting information and spreading code are carried out spreading operations。
6) BPSK modulation 9 receives the transmitting PLL parameter launching compensation parameter calculation unit 6 output, adjust and launch PLL frequency dividing ratio, and realize launching the BPSK modulation of signal, after PA10 power amplification, launched by transmitting antenna 11。
Example described above only have expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention。It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention。Therefore, the protection domain of patent of the present invention should be as the criterion with claims。
Claims (9)
1. a method for Big Dipper RDSS terminal Doppler frequency compensation, described method includes, and when described terminal remains static, calculates the local crystal oscillator frequency deviation of described terminal；It is characterized in that, described method also includes, when described terminal high-speed moves, utilize the carrier frequency control word that described local crystal oscillator frequency deviation and digital received circuit (4) export, calculate and launch code NCO frequency control word and launch PLL parameter, utilize described transmitting code NCO frequency control word to control described transmitting code NCO output, utilize described transmitting PLL state modulator BPSK modulation。
2. the method for claim 1, it is characterised in that described method also includes, the local crystal oscillator frequency offset calculation formula of described terminal is:
Wherein,It is the local crystal oscillator frequency deviation of described terminal, FCWcode_rxIt is the code frequency control word of described digital received circuit (4) code tracking loop output, fPNIt is spread-spectrum code rate, fs_REFBeing described digital received circuit (4) work nominal frequency, N is described digital received circuit (4) code NCO phase width。
3. method as described in any one in claim 1 or 2, it is characterised in that described method also includes, the frequency control word computing formula of described transmitting code NCO input is:
FCWcode_txIt is the frequency control word of described transmitting code NCO input, fPNIt is spread-spectrum code rate, wherein,
fs_REFBeing described digital received circuit (4) and described transmitting code NCO work nominal frequency, N is the phase width of described transmitting code NCO and described digital received circuit (4) code NCO, FCWcode_rxIt is the code frequency control word that exports of described digital received circuit (4),It it is described local crystal oscillator frequency deviation；
Described transmitting PLL parameter calculation formula is:
Wherein, M makes described transmitting PLL input and output clock frequency meetTransmitting PLL frequency dividing ratio parameter, wherein fPLL_inFor described transmitting PLL input clock frequency, fPLL_outFor described transmitting PLL output clock frequency, M and R is integer, fPNIt is spread-spectrum code rate, fs_REFBeing described digital received circuit (4) and described transmitting code NCO work nominal frequency, N launches code NCO and described digital received circuit (4) code NCO phase width, FCWcode_rxIt is the code frequency control word that exports of described digital received circuit (4),It is described local crystal oscillator frequency deviation, M0It is described transmitting PLL nominal parameters, operatorRepresent and round downwards。
4. the method for claim 1, it is characterised in that described method also includes, for adopting the radio frequency reception channel of mixing scheme under low local oscillator, the local crystal oscillator frequency offset calculation formula of described terminal is:
Wherein,It is the local crystal oscillator frequency deviation of described terminal, fs_REFBeing described digital received circuit (4) work nominal frequency, N is described digital received circuit (4) carrier wave NCO phase width, fIF_REFIt is the nominal carrier frequency of digital medium-frequency signal, fdown_outIt is departures downlink nominal carrier frequency, FCWcarrier_rxIt it is the carrier frequency control word of described digital received circuit (4) carrier tracking loop output。
5. method as described in any one in claim 4 or 5, it is characterised in that described method also includes, for adopting the radio frequency reception channel of mixing scheme under low local oscillator, the frequency control word computing formula of described transmitting code NCO input is:
Wherein, FCWcode_txIt is the frequency control word of described transmitting code NCO input, fPNIt is spread-spectrum code rate, fs_REFBeing described digital received circuit (4) and the work nominal frequency of described transmitting code NCO, N is described transmitting code NCO and described digital received circuit (4) carrier wave NCO phase width,It is described local crystal oscillator frequency deviation, fIF_REFIt is the nominal carrier frequency of digital medium-frequency signal, fdown_outIt is departures downlink nominal carrier frequency, FCWcarrier_rxIt it is the carrier frequency control word that exports of described digital received circuit (4)；
Described transmitting PLL parameter calculation formula is:
Wherein, M makes described transmitting PLL input and output clock frequency meetTransmitting PLL frequency dividing ratio parameter, wherein fPLL_inFor described transmitting PLL input clock frequency, fPLL_outFor described transmitting PLL output clock frequency, M and R is integer, fPNIt is spread-spectrum code rate, fs_REFBeing described digital received circuit (4) and described transmitting code NCO work nominal frequency, N is described transmitting code NCO and described digital received circuit (4) carrier wave NCO phase width,It is described local crystal oscillator frequency deviation, fIF_REFIt is the nominal carrier frequency of digital medium-frequency signal, fdown_outIt is departures downlink nominal carrier frequency, FCWcarrier_rxIt is the carrier frequency control word that exports of described digital received circuit (4), M0It is described transmitting PLL nominal parameters, operatorRepresent and round downwards。
6. a Big Dipper RDSS terminal, described terminal includes, reception antenna (1), down coversion (2), ADC (3), digital received circuit (4), local crystal oscillator frequency offset calculation unit (5), launch compensation parameter calculation unit (6), launch code NCO (7), spread spectrum (8), BPSK modulates (9), PA (10), transmitting antenna (11), it is characterized in that, described digital received circuit (4) outgoing carrier frequency control word and code frequency control word give described local crystal oscillator frequency offset calculation unit (5) and described transmitting compensation parameter calculation unit (6), described local crystal oscillator frequency offset calculation unit (5) output local crystal oscillator frequency deviation gives described transmitting compensation parameter calculation unit (6), code NCO frequency control word is launched in the output of described transmitting compensation parameter calculation unit (6) and transmitting PLL parameter modulates (9) to described transmitting code NCO (7) and described BPSK respectively, described transmitting code NCO (7) outputs signals to described spread spectrum (8), described spread spectrum (8) output spreading code modulates (9) to described BPSK。
7. terminal as claimed in claim 6, it is characterised in that when described terminal remains static, described local crystal oscillator frequency offset calculation unit (5) calculates the local crystal oscillator frequency deviation of described terminal；When described terminal high-speed moves, the carrier frequency control word that described local crystal oscillator frequency deviation and digital received circuit (4) export, described transmitting compensation parameter calculation unit (6) is utilized to calculate described transmitting code NCO frequency control word and described transmitting PLL parameter。
8. terminal as claimed in claim 7, it is characterised in that described local crystal oscillator frequency offset calculation unit (5) utilizes the timing signal from GNSS receiver output to calculate the local crystal oscillator frequency deviation of described terminal。
9. terminal as claimed in claim 8, it is characterized in that, described local crystal oscillator frequency offset calculation unit (5) utilizes counting method to calculate the local crystal oscillator frequency deviation of described terminal from the timing signal that described GNSS receiver exports, and computing formula is:
Wherein, T is double timing signal interval, and K is count value, fosc_REFIt it is tested frequency source nominal frequency。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245797A (en) * | 2018-08-22 | 2019-01-18 | 西安空间无线电技术研究所 | A kind of unified carrier system signal coherence forwarding realization method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7253767B1 (en) * | 2005-09-01 | 2007-08-07 | Martin Junkar | Flat model software compensated crystal oscillator for GPS receiver |
| CN101420253A (en) * | 2008-12-05 | 2009-04-29 | 航天恒星科技有限公司 | Doppler compensation method for full arch satellite remote control |
| CN103499823A (en) * | 2013-09-29 | 2014-01-08 | 北京星地恒通信息科技有限公司 | Two-dimensional parallel acquisition system in spread spectrum communication |
| CN103929221A (en) * | 2013-01-11 | 2014-07-16 | 正文科技股份有限公司 | Frequency compensation device and frequency compensation method |
| CN104252000A (en) * | 2013-06-28 | 2014-12-31 | 成都国星通信有限公司 | DDS (direct digital synthesizer)-based Doppler speedy compensating circuit and DDS-based Doppler speedy compensating method |
-
2015
- 2015-12-31 CN CN201511034552.5A patent/CN105699989B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7253767B1 (en) * | 2005-09-01 | 2007-08-07 | Martin Junkar | Flat model software compensated crystal oscillator for GPS receiver |
| CN101420253A (en) * | 2008-12-05 | 2009-04-29 | 航天恒星科技有限公司 | Doppler compensation method for full arch satellite remote control |
| CN103929221A (en) * | 2013-01-11 | 2014-07-16 | 正文科技股份有限公司 | Frequency compensation device and frequency compensation method |
| CN104252000A (en) * | 2013-06-28 | 2014-12-31 | 成都国星通信有限公司 | DDS (direct digital synthesizer)-based Doppler speedy compensating circuit and DDS-based Doppler speedy compensating method |
| CN103499823A (en) * | 2013-09-29 | 2014-01-08 | 北京星地恒通信息科技有限公司 | Two-dimensional parallel acquisition system in spread spectrum communication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245797A (en) * | 2018-08-22 | 2019-01-18 | 西安空间无线电技术研究所 | A kind of unified carrier system signal coherence forwarding realization method and system |
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