CN102759741B - GPS (Global Position System) receiver - Google Patents
GPS (Global Position System) receiver Download PDFInfo
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- CN102759741B CN102759741B CN201110111669.4A CN201110111669A CN102759741B CN 102759741 B CN102759741 B CN 102759741B CN 201110111669 A CN201110111669 A CN 201110111669A CN 102759741 B CN102759741 B CN 102759741B
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Abstract
The invention is suitable for the field of communication and provides a GPS (Global Position System) receiver, which comprises a signal catcher used for coarsely catching a phase and a frequency of a satellite signal to generate a coarse synchronizing signal, a signal mixing and correlator used or carrying out mixing and relative operation on the satellite signal and outputting the relative result of the signal, a DSP (Digital Signal Processor) used for loading the corresponding algorithm and carrying out phase identification and filtering on the relative result of the signal so as to obtain and return a signal tracking result to the signal mixing and correlator, and a relative result computing unit used for figuring up a navigation bit and a carrier to noise ratio according to the relative result of the signal. According to the invention, the phase identification and filtering functions in a tracking loop of the GPS receiver can be completed by the DSP process, flexibility of the DSP processor on the algorithm selection is fully utilized, the tracking algorithm is dynamically adjusted, and tracking parameters are optimized well.
Description
Technical field
The invention belongs to the communications field, relate in particular to a kind of GPS receiver.
Background technology
GPS (Global Positioning System, GPS) receiver is by the catching and follow the tracks of user is positioned of satellite-signal, and calculates the parameters such as user's latitude and longitude coordinates and height value simultaneously.In GPS receiver, first by signal capture device, obtain coarse phase and the frequency of satellite-signal, now, because phase place and the frequency accuracy of the satellite-signal obtaining are limited, need further by track loop, it to be followed the tracks of to processing, thereby obtain more accurate satellite-signal phase place and frequency.
The structure of traditional GPS receiver tracking loop circuit as shown in Figure 1, comprises gps signal is carried out to carrier track and code tracking.Wherein, from carrier wave, demodulation is out by gps signal for carrier track, with reference to Fig. 1, carrier loop phase detector 11 is used for finding the phase error between local carrier and input carrier signal, its Output rusults is sent into local carrier generator 13 after by carrier loop wave filter 12, thereby the frequency of local carrier and phase place are adjusted; Code tracking is that the signal demodulating by carrier track and local C/A code are carried out related calculation, according to the result of related operation, obtain the phase differential of input signal and local C/A code, its result returns to local C/A code generator and adjusts the new local C/A code of generation after processing by filtering, for participating in the related operation of next stage.Above-mentioned carrier track and code tracking process move in circles, and make the frequency of local carrier and phase place constantly close to frequency and the phase place of gps signal, thereby realize signal trace.
Yet, above-mentioned carrier track process need constantly calculates the parameters such as carrier wave step-length, carrier phase are residual, code step-length, code mismatch sampling interval, to realize the adjustment to above-mentioned parameter, and existing carrier loop phase demodulation part is only limited to hardware realization conventionally, can only fix a kind of computing method and obtain corresponding result of calculation, once after hardware is fixing, cannot recycles existing structure and realize more optimal calculation of parameter, also therefore cannot reach more optimal tracking effect.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of GPS receiver, is intended to solve existing GPS receiver and cannot realizes the problem to the flexible processing of tracking parameter.
The embodiment of the present invention is achieved in that a kind of GPS receiver, and described GPS receiver comprises:
Signal capture device, for the phase place of satellite-signal and frequency are slightly caught, produces coarse synchronization signal;
Signal mixing and correlator, for satellite-signal is carried out to mixing and associative operation, obtain and output signal correlated results;
Dsp processor, for loading corresponding algorithm, carries out phase demodulation and filtering to described signal correction result, and to described signal mixing and correlator return signal phase demodulation and filtering result;
Correlated results computing unit, calculates for carry out navigation bit and carrier-to-noise ratio according to signal correction result;
In described signal capture device, the signal of fast fourier transform FFT arithmetic element output, after multiplier, then is inputted back described FFT arithmetic element via scheduling unit, to export fast fourier inverse transformation IFFT signal.
In embodiments of the present invention, by dsp processor, complete phase demodulation and the filter function in GPS receiver tracking loop circuit, take full advantage of the characteristics and advantages that dsp processor can load algorithms of different flexibly, realized the dynamic adjustment of track algorithm, optimize well the flexible adjustment capability to tracking parameter, finally realized the raising of tracking sensitivity.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the GPS receiver tracking loop circuit that provides of prior art;
Fig. 2 is the structural drawing of the GPS receiver that provides of the embodiment of the present invention;
Fig. 3 is the structural drawing of the GPS receiver signal grabber that provides of prior art;
Fig. 4 is the structural drawing of the GPS receiver signal grabber that provides of the embodiment of the present invention;
Fig. 5 is the concrete structure figure of the GPS receiver dsp processor that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
In embodiments of the present invention, by digital signal processor (Digital Signal Processor, DSP) complete phase demodulation and the filter function in GPS receiver tracking loop circuit, take full advantage of the dirigibility that dsp processor is realized for algorithm, realized the dynamic adjustment of track algorithm, optimize well tracking parameter, thereby improved tracking sensitivity.
Fig. 2 shows the structure of the GPS receiver that the embodiment of the present invention provides, and for convenience of explanation, only shows part related to the present invention.
This GPS receiver has comprised signal capture device 21, signal mixing and correlator 22, dsp processor 23 and correlated results computing unit 24 these four parts, wherein:
Signal capture device 21 is caught for the initial phase of satellite-signal and frequency are carried out to Fast Coarse, its traditional inner structure as shown in Figure 3, signal capture device 21 is by signal mixing, down-sampling, fast fourier transform (Fast Fourier Transformation, FFT) and fast fourier inverse transformation (Inverse Fast FourierTransformation, FFT) etc. link realizes slightly catching satellite-signal, and producing coarse synchronization signal, its specific works principle is not described in detail in this.
In embodiments of the present invention, existing FFT and IFFT structure are improved, as shown in Figure 4, the signal of being exported by FFT arithmetic element 41 is after multiplier 42, via scheduling unit 43, input back FFT arithmetic element 41 again, the signal of now being exported by FFT arithmetic element 41 is again through the signal of IFFT computing.The FFT that the embodiment of the present invention adopts and IFFT share the structure of an arithmetic element, have effectively reduced hardware area, have reduced hardware cost.
Signal mixing and correlator 22, dsp processor 23 and correlated results computing unit 24 have formed the track loop part of GPS receiver, wherein:
22 pairs of gps signals of signal mixing and correlator carry out mixing and associative operation, first it multiply each other the local carrier signal of the gps signal of input and the generation of local carrier generator by frequency mixer, demodulate intermediate-freuqncy signal, and the I of output orthogonal, Q two paths of signals, by correlator, the signal of the signal after mixing and the generation of local C/A code generator is carried out to associative operation, output signal correlated results afterwards.
In embodiments of the present invention, the original frequency of local carrier signal and phase place produce according to frequency and the phase place of the gps signal coarse synchronization signal of output in signal capture device 21.
Dsp processor 23, according to the signal correction result that receives signal mixing and correlator 22 outputs, and by being loaded into the algorithm in dsp processor 23, input signal is carried out to phase demodulation and filtering processing, to realize filtering and the phase demodulation operation in carrier tracking loop and code tracking loop.Meanwhile, the signal of its output turns back to signal mixing and the associative operation that carries out next millisecond in signal mixing and correlator 22, with further accurate local carrier frequency and code phase.
In embodiments of the present invention, dsp processor 23 is by calculating the signal correction result of input, obtain thus the parameter that satellite-signal tracking accuracy is exerted an influence, comprise: carrier wave step-length, carrier phase is residual, the signal of next millisecond of processing is counted, code step-length and code mismatch sampling interval etc., above-mentioned parameter is according to different signal correction results by dsp processor 23, in loaded algorithm operational process, by calling, different algorithmic functions calculates, the degree of optimization of the algorithmic function loading has determined the precision of drawn parameter, therefore according to dsp processor 23, can load flexibly the characteristic of algorithms of different function, can realize the flexible processing to tracking parameter, finally realize the raising of tracking sensitivity.
In embodiments of the present invention, the phase demodulation of exporting by dsp processor 23 and filtering result return in signal mixing and correlator 22 again, local carrier and code phase are adjusted, to carry out signal mixing and the associative operation of next millisecond, so move in circles, to reach the meticulous tracking to the frequency of input signal and phase place.
Correlated results computing unit 24, according to the signal correction result of signal mixing and correlator 22 outputs, carries out correlated results calculating, comprises that navigation bit calculates and carrier-to-noise ratio is calculated, for finally calculating the parameters such as user's latitude and longitude coordinates and height value.
Fig. 5 shows the concrete structure of the GPS receiver dsp processor 23 that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the present embodiment.
In embodiments of the present invention, dsp processor 23 has comprised data-reading unit 231, algorithm loading unit 232, computing unit 233 and data write unit 234, wherein:
Data-reading unit 231 reads the signal correction result by signal mixing and correlator 22 outputs, and first it by receiving the interrupt request of signal mixing and correlator 22, store content by inquiry after response interrupt request, reads and need data to be processed.
Algorithm loading unit 232, loads algorithm, for calculating tracking parameter.
Computing unit 233, the algorithm loading according to algorithm loading unit 232, calculates signal correction result, to realize filtering and phase demodulation operation, and output filtering and identified result.In embodiments of the present invention, for the difference of parameter, computing unit 233 calls different algorithmic functions to realize the processing to different parameters, to realize the flexible Application of track algorithm.
Data write unit 234, the tracking parameter that computing unit 233 is calculated returns to signal mixing and the associative operation that mixing and correlator 22 carry out next millisecond, to lock gradually carrier frequency and code phase.
In embodiments of the present invention, GPS receiver carries out flexible calculating and the adjustment of tracking parameter to gps signal by dsp processor, to realize the raising to gps signal tracking sensitivity, has reached the object of optimizing gps signal tracking effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a GPS receiver, is characterized in that, described GPS receiver comprises:
Signal capture device, for the phase place of satellite-signal and frequency are slightly caught, produces coarse synchronization signal;
Signal mixing and correlator, for satellite-signal is carried out to mixing and associative operation, and output signal correlated results;
Dsp processor, be used for loading corresponding algorithm, described signal correction result is carried out to phase demodulation and filtering, obtain and to described signal mixing and the filtering of correlator return signal and identified result, parameter corresponding to described signal filtering and identified result comprises that carrier wave step-length, carrier phase signal residual, next millisecond of processing are counted, code step-length and code mismatch sampling interval;
Correlated results computing unit, calculates for carry out navigation bit and carrier-to-noise ratio according to signal correction result;
In described signal capture device, the signal of fast fourier transform FFT arithmetic element output, after multiplier, then is inputted back described FFT arithmetic element via scheduling unit, to export fast fourier inverse transformation IFFT signal.
2. GPS receiver as claimed in claim 1, is characterized in that, described signal mixing and correlator comprise:
Frequency mixer, for carrying out mixing operation by satellite-signal and local carrier signal, output signal mixing results;
Correlator, for carrying out associative operation, output signal correlated results by described signal mixing results and local C/A code.
3. GPS receiver as claimed in claim 2, is characterized in that, described signal mixing and correlator also comprise:
Local carrier generator, for generation of local carrier signal;
Local C/A code generator, for generation of local C/A code.
4. GPS receiver as claimed in claim 3, is characterized in that, described local carrier generator obtains original frequency and the phase place of local carrier signal according to described coarse synchronization signal.
5. GPS receiver as claimed in claim 1, is characterized in that, described signal mixing and correlator be also for receiving described signal filtering and identified result, and according to described signal filtering and identified result, carries out mixing and the associative operation of next millisecond.
6. GPS receiver as claimed in claim 1, is characterized in that, described dsp processor comprises:
Data-reading unit, for reading described signal correction result;
Algorithm loading unit, for loading corresponding algorithm;
Computing unit, for according to the algorithm loading, described signal correction result being processed, obtains signal filtering and identified result;
Data write unit, for returning to described signal filtering and identified result to described signal mixing and correlator.
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| CN201110111669.4A CN102759741B (en) | 2011-04-29 | 2011-04-29 | GPS (Global Position System) receiver |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1340997A2 (en) * | 2002-02-27 | 2003-09-03 | Sony Corporation | GPS receiving apparatus and GPS satellite signal receiving method |
| CN101063717A (en) * | 2006-04-24 | 2007-10-31 | 中国科学院微电子研究所 | Method for capturing GPS signal by FFT |
| CN101464508A (en) * | 2008-12-19 | 2009-06-24 | 苏州莱迪斯特电子有限公司 | Method for capturing C/A code signal of GPS |
| CN101819278A (en) * | 2010-03-25 | 2010-09-01 | 北京航空航天大学 | Signal acquisition method of GPS receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7358897B2 (en) * | 2004-08-16 | 2008-04-15 | Sony Ericsson Mobile Communicatios Ab | Apparatus, methods and computer program products for GPS signal acquisition using an adaptive search engine |
| CN101216549B (en) * | 2008-01-11 | 2010-04-21 | 哈尔滨工程大学 | Medium-high frequency wave spread-spectrum navigation system distance observed quantity extraction method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1340997A2 (en) * | 2002-02-27 | 2003-09-03 | Sony Corporation | GPS receiving apparatus and GPS satellite signal receiving method |
| CN101063717A (en) * | 2006-04-24 | 2007-10-31 | 中国科学院微电子研究所 | Method for capturing GPS signal by FFT |
| CN101464508A (en) * | 2008-12-19 | 2009-06-24 | 苏州莱迪斯特电子有限公司 | Method for capturing C/A code signal of GPS |
| CN101819278A (en) * | 2010-03-25 | 2010-09-01 | 北京航空航天大学 | Signal acquisition method of GPS receiver |
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Denomination of invention: Doppler frequency compensation method of GPS receiver Effective date of registration: 20171102 Granted publication date: 20141210 Pledgee: China Co truction Bank Corp Guangzhou economic and Technological Development Zone sub branch Pledgor: Anyka (Guangzhou) Microelectronics Technology Co., Ltd. Registration number: 2017990001008 |
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Denomination of invention: Doppler frequency compensation method of GPS receiver Effective date of registration: 20190130 Granted publication date: 20141210 Pledgee: China Co truction Bank Corp Guangzhou economic and Technological Development Zone sub branch Pledgor: Anyka (Guangzhou) Microelectronics Technology Co., Ltd. Registration number: 2019440000051 |
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Date of cancellation: 20200320 Granted publication date: 20141210 Pledgee: China Co truction Bank Corp Guangzhou economic and Technological Development Zone sub branch Pledgor: ANYKA (GUANGZHOU) MICROELECTRONICS TECHNOLOGY Co.,Ltd. Registration number: 2019440000051 |
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Address after: 3 / F, C1 area, innovation building, 182 science Avenue, Science City, Guangzhou, Guangdong 510663 Patentee after: Guangzhou Ankai Microelectronics Co.,Ltd. Address before: 3 / F, C1 area, innovation building, 182 science Avenue, Science City, Guangzhou, Guangdong 510663 Patentee before: ANYKA (GUANGZHOU) MICROELECTRONICS TECHNOLOGY Co.,Ltd. |
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Address after: 510555 No. 107 Bowen Road, Huangpu District, Guangzhou, Guangdong Patentee after: Guangzhou Ankai Microelectronics Co., Ltd Address before: 3 / F, C1 area, innovation building, 182 science Avenue, Science City, Guangzhou, Guangdong 510663 Patentee before: Guangzhou Ankai Microelectronics Co., Ltd |