CN102096080B - Feedback control device and method for radio-frequency front end and baseband processing of GPS (Global Positioning System) receiver - Google Patents
Feedback control device and method for radio-frequency front end and baseband processing of GPS (Global Positioning System) receiver Download PDFInfo
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- CN102096080B CN102096080B CN 201010565656 CN201010565656A CN102096080B CN 102096080 B CN102096080 B CN 102096080B CN 201010565656 CN201010565656 CN 201010565656 CN 201010565656 A CN201010565656 A CN 201010565656A CN 102096080 B CN102096080 B CN 102096080B
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Abstract
The invention provides a feedback control device and method for the radio-frequency front end and baseband processing of a GPS (Global Positioning System) receiver. A feedback loop for adjusting the sampling frequency of the radio-frequency front end according to a capturing result and carrier-to-noise ratio estimated value is arranged on the forward passage for sending intermediate-frequency digital signals of the radio-frequency front end to the baseband processing; a capturing result and carrier-to-noise ratio estimating module sends the number of captured satellites obtained through a baseband processing part and the capturing carrier-to-noise ratio information to a coordinated control device and simultaneously calculates an appropriate sampling frequency; a frequency generating device applies an FPGA (Field Programmable Gate Array) and the frequency multiplication and frequency division programs compiled in other programmable control platforms to generate the needed sampling frequency; and the sampling frequency is sent to the radio-frequency front end. The feedback control device and method provided by the invention adjust the sampling frequency of an ADC (Analog-to-Digital Converter) at the radio-frequency front end through the satellite signal capturing result and carrier-to-noise ratio estimated value obtained through the baseband processing part, thereby influencing the data rate and carrier-to-noise ratio of the intermediate-frequency digital signals input into the baseband processing part.
Description
Technical field
What the present invention relates to is a kind of satellite navigation positioning device.The present invention also relates to a kind of satellite navigation locating method.
Background technology
The basic skills of GPS receiver comprises: antenna part, radio-frequency front-end part, Base-Band Processing part and navigation calculation part.Antenna part realizes the reception of faint gps signal; Radio-frequency front-end is partly realized power amplification, noise filtering, the frequency inverted of signal, and analog to digital conversion; Base-Band Processing partly realizes catching, following the tracks of of signal, and bit synchronization etc.; The navigation calculation part is according to the code phase that obtains, Doppler shift, the information calculations positioning results such as navigation message.Wherein, the sample frequency of radio-frequency front-end can directly have influence on data transfer rate and the signal carrier-to-noise ratio of the digital intermediate frequency signal that obtains after the analog to digital conversion, and the digital intermediate frequency signal that different sample frequency obtain will affect operand and the sensitivity of Base-Band Processing part.Adopt low sample frequency, acquisition speed is improved, and the carrier-to-noise ratio of signal but descends, and is general applicable to the GPS receiver under the high dynamic environment; And adopt high sample frequency, and the signal carrier-to-noise ratio that obtains is higher, and the speed of catching but is restricted, and is general applicable to the GPS receiver under the weak signal environment.
The working environment of GPS receiver normally constantly changes, traditional hardware receiver and present software receiver all can't be real-time the signal of adjusting radio-frequency front-end of the quality according to lock-on signal process, therefore increase a basis on the basis of GPS software receiver and catch the backfeed loop of result and carrier-to-noise ratio estimated value coordination control radio-frequency front-end sample frequency, just can take into account simultaneously capture time and catch relation between the sensitivity, and then realize that the GPS receiver is according to the different signal processing policies of adjusting in real time radio-frequency front-ends of working environment.Yet present GPS receiver only has radio-frequency front-end to arrive the forward path of Base-Band Processing, is difficult to carry out the coordination control of sample frequency.
Summary of the invention
The object of the present invention is to provide a kind of satellite signal acquisition result and carrier-to-noise ratio estimated value by partly obtaining from Base-Band Processing, adjust the sample frequency of radio-frequency front-end ADC, and then impact is input to data transfer rate and the GPS receiver radio frequency front end of carrier-to-noise ratio and the feed back control system of Base-Band Processing of the digital intermediate frequency signal of Base-Band Processing part.The present invention also aims to provide the feedback of a kind of GPS receiver radio frequency front end and Base-Band Processing.
The object of the present invention is achieved like this:
The feed back control system of GPS receiver radio frequency front end of the present invention and Base-Band Processing comprises the through path of the radio-frequency front-end digital intermediate frequency signal being sent into Base-Band Processing; Comprise that also a basis is caught the result and the carrier-to-noise ratio estimated value is regulated the backfeed loop of radio-frequency front-end sample frequency; Described backfeed loop is by catching result, carrier-to-noise ratio estimation module, and coordinating control module and sample frequency generation module form.
The feedback of GPS receiver radio frequency front end of the present invention and Base-Band Processing is:
The radio-frequency front-end digital intermediate frequency signal is being sent on the through path of Base-Band Processing, the backfeed loop that a basis is caught result and carrier-to-noise ratio estimated value adjusting radio-frequency front-end sample frequency is being set; This backfeed loop comprises catches result, carrier-to-noise ratio estimation module, coordinating control module and sample frequency generation module; Catch result, carrier-to-noise ratio estimation module and will catch number of satellite by what Base-Band Processing partly obtained, and catch carrier-to-noise ratio information, be sent to cooperative control device, calculate simultaneously suitable sample frequency, the frequency generating apparatus is then used frequency multiplication and the frequency division program of writing in FPGA and other control platform able to programme and is generated needed sample frequency, and this frequency is sent into radio-frequency front-end.
The present invention proposes feed back control system and method between a kind of GPS receiver radio frequency fore-end and the Base-Band Processing part, partly increased the backfeed loop of coordinating to control the radio-frequency front-end sample frequency according to satellite signal acquisition result and carrier-to-noise ratio estimated value in radio-frequency front-end part and Base-Band Processing, by satellite signal acquisition result and the carrier-to-noise ratio estimated value that partly obtains from Base-Band Processing, adjust the sample frequency of radio-frequency front-end ADC, and then impact is input to data transfer rate and the carrier-to-noise ratio of the digital intermediate frequency signal of Base-Band Processing part.The feedback control loop that the present invention increases comprises: catch result, carrier-to-noise ratio estimation unit, cooperative control device and sample frequency generating apparatus.
The present invention can be widely used in the research and development of existing software receiver based on FPGA and other control hardware platform able to programme, under the prerequisite that does not increase hardware cost, can make up the coordination control backfeed loop of radio-frequency front-end part and Base-Band Processing part by the software of FPGA.In addition, feedback is applicable in the software receiver design of the GLONASS (Global Navigation Satellite System) such as Galileo in the COMPASS of GPS, China of the U.S. and Europe between radio-frequency front-end of the present invention and the Base-Band Processing.
Description of drawings
Fig. 1 is basic skills figure of the present invention;
Fig. 2 is the connection diagram of radio-frequency front-end and Base-Band Processing platform;
Fig. 3 is the process flow diagram of cooperative control device;
Fig. 4 is that the present invention utilizes first frequency multiplication, and rear frequency division is realized the schematic diagram of frequency generating apparatus;
Fig. 5 is that the present invention utilizes first frequency division, and rear frequency multiplication realizes the schematic diagram of frequency generating apparatus.
Embodiment
For example the present invention is done more detailed description below in conjunction with accompanying drawing:
In conjunction with Fig. 1, the present invention has designed feed back control system and method between a kind of radio-frequency front-end part and the Base-Band Processing part under existing software receiver framework based on FPGA and other control hardware platform able to programme.On the basis of traditional through path of the radio-frequency front-end digital intermediate frequency signal being sent into Base-Band Processing, increase a basis and catch the backfeed loop of result and carrier-to-noise ratio estimated value adjusting radio-frequency front-end sample frequency, comprise: catch result, carrier-to-noise ratio estimation unit, cooperative control device and sample frequency generating apparatus.
Concrete control flow of the present invention is: will catch number of satellite by what Base-Band Processing partly obtained, and catch carrier-to-noise ratio information, be sent to cooperative control device, calculate simultaneously suitable sample frequency, the frequency generating apparatus is then used frequency multiplication and the frequency division program of writing in FPGA and other control platform able to programme and is generated needed sample frequency, and this frequency is sent into radio-frequency front-end.
The radio frequency front-end device of selecting among the present invention need to have with base band processing device and carries out the mutual function of clock frequency, such as the MAX2741 of typical radio-frequency front-end chip Maxim company, and can realize communication by the form of spi bus between the follow-up Base-Band Processing platform.Shown in 3, spi bus comprises serial clock line interface SCLK, and the slave of Low level effective is selected line/CS, main frame output/slave input data line SDI, and main frame input/slave output data line SDO.
The enforcement of satellite signal acquisition result of the present invention, carrier-to-noise ratio estimation unit comprises: 1. judge visible satellite quantity by catching the result; 2. according to formula (1) estimated signal carrier-to-noise ratio value.
(1)
Wherein, C/N
0For the signal carrier-to-noise ratio is estimated, SNR is that Signal-to-Noise is estimated T
CohBe the coherent integration time, A is the amplitude of useful signal, and noise signal satisfies (0, s
2) Gaussian distribution.
The frequency of cooperative control device is adjusted strategy as shown in Figure 3 among the present invention, when catching that the number of satellite of display capture can't satisfy location requirement as a result, then improve sample frequency, until satisfy the demands, consider the processing power of receiver and sample frequency to the impact of carrier-to-noise ratio, among the present invention sample frequency on be limited to 30MHz.When catching that the number of satellite of display capture can effectively satisfy location requirement as a result, can process the difference of minimum carrier-to-noise ratio by relatively carrier-to-noise ratio estimated value and receiver, suitably reduce sample frequency, the lower 2MHz that is limited to of sample frequency among the present invention.
Cooperative control device of the present invention need to satisfy between the feasible region of if signal sampling frequency, but frequency multiplication and the set of frequency division program generated frequency, and the adjustment strategy of frequency.Obtain according to formula (2) between the feasible region of the intermediate-freuqncy signal bandpass sampling frequency of cooperative control device,
Wherein, B is the bandwidth of gps signal, f
cBe the centre frequency of intermediate-freuqncy signal, f
sBe the sampling rate of bandpass sampling, n is positive integer, satisfies 1#n int ((f
c+ B/2)/B), the lower rounding operation of int () expression.
Clock frequency generating apparatus of the present invention, realized by the frequency multiplication of writing and frequency division program, for example, existing clock frequency is 10MHz, generate the sample frequency of 4MHz, then can utilize first the frequency multiplication program that the frequency translation of 10MHz is 20MHz, then send into the frequency division program, its five frequency division is then obtained the required frequency that gets, and circuit theory diagrams as shown in Figure 4.And if existing clock frequency is 10MHz, generate the sample frequency of 15MHz, then can utilize first the frequency division program that the frequency translation of 10MHz is 5MHz, then send into the frequency multiplication program, obtain the required frequency that gets, circuit theory diagrams are as shown in Figure 5.Feed back the radio-frequency front-end that the sample frequency that obtains is sent into receiver according to cooperative control device, realize the adjustment to digital intermediate frequency signal.
The clock multiplier factor of the integrated phase lock of cooperative control device and frequency division program and Frequency Dividing Factor adopt integer among the present invention, and the frequency number that therefore can generate is limited.Will satisfy between the feasible region of if signal sampling frequency and but the sample frequency of frequency multiplication and the set of frequency division program generated frequency is stored in cooperative control device.
In addition, for based on ARM, the software receiver of DSP hardware platform also can by increasing the mode of backward channel, be realized the FEEDBACK CONTROL of GPS receiver radio frequency front end and Base-Band Processing.
Claims (2)
1. the feed back control system of a GPS receiver radio frequency front end and Base-Band Processing comprises the through path of the radio-frequency front-end digital intermediate frequency signal being sent into Base-Band Processing; It is characterized in that: comprise that also a basis is caught the result and the carrier-to-noise ratio estimated value is regulated the backfeed loop of radio-frequency front-end sample frequency; Described backfeed loop is by catching result, carrier-to-noise ratio estimation module, and coordinating control module and sample frequency generation module form.
2. the feedback of a GPS receiver radio frequency front end and Base-Band Processing, it is characterized in that: the radio-frequency front-end digital intermediate frequency signal is being sent on the through path of Base-Band Processing, the backfeed loop that a basis is caught result and carrier-to-noise ratio estimated value adjusting radio-frequency front-end sample frequency is set; This backfeed loop comprises catches result, carrier-to-noise ratio estimation module, coordinating control module and sample frequency generation module; Catch result, carrier-to-noise ratio estimation module and will catch number of satellite by what Base-Band Processing partly obtained, and catch carrier-to-noise ratio information, be sent to cooperative control device, calculate simultaneously suitable sample frequency, the frequency generating apparatus is then used frequency multiplication and the frequency division program of writing in FPGA and other control platform able to programme and is generated needed sample frequency, and this frequency is sent into radio-frequency front-end.
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| CN102680986B (en) * | 2012-05-15 | 2014-04-16 | 哈尔滨工程大学 | Feedback loop and method for capturing signal based on adjustable-frequency GPS (Global Positioning System) receiver |
| CN109981124B (en) * | 2019-04-11 | 2021-08-03 | 成都盛芯微科技有限公司 | Adaptive sampling method for analog-to-digital converter for improving sensitivity attenuation of radio frequency receiver |
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| CN101516129A (en) * | 2008-02-22 | 2009-08-26 | 上海思谋微电子技术有限公司 | Radio frequency interference resistant method of built-in positioning receiver of GSM terminal and product thereof |
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| US7230568B2 (en) * | 2004-11-05 | 2007-06-12 | Trimble Navigation Limited | GPS receiver having a phase lock loop hold off |
| CN101030787B (en) * | 2006-02-27 | 2010-12-22 | 凹凸科技（中国）有限公司 | Method and apparatus for estimating signal noise ratio of frequency-amplifying signal |
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| CN101516129A (en) * | 2008-02-22 | 2009-08-26 | 上海思谋微电子技术有限公司 | Radio frequency interference resistant method of built-in positioning receiver of GSM terminal and product thereof |
Non-Patent Citations (1)
| Title |
|---|
| 丁继成等.《应用频率误差修正的高灵敏度GPS信号捕获技术》.《哈尔滨工程大学学报》.2009,第30卷(第8期),全文. * |
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