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A technology of GPS receiver and signal acquisition, which is applied to satellite radio beacon positioning systems, measuring devices, instruments, etc., and can solve problems such as time-consuming, time-consuming, and large amount of computation
Inactive Publication Date: 2010-09-01
BEIHANG UNIV
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Existing signal capture technologies include code phase serial capture and Doppler frequency shift serial capture. These algorithms have a large amount of computation and take a long time, which is not conducive to rapid signal capture and positioning.
James Bao-yen Tsui. Fundamentals of Global Positioning System Receivers: a software approach [M]. New York: John Wiley&Sons Inc., 2000. Disclosed a code phase parallel acquisition algorithm based on FFT (Fast Fourier Transformation), its algorithm implementation principle like figure 1 As shown, the FFT-based code phase parallel acquisition algorithm is relatively fast, but in the actual implementation process, the usual algorithm requires a large number of Fourier transform calculations, which is also time-consuming
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Embodiment 1
[0095] Search for the satellite signal of the PRN5 satellite, set the intermediate frequency of the intermediate frequency digital signal to 4.123968MHz, the sampling frequency is 16.367667MHz, and the Doppler frequency shift search step length is 1kHz when capturing, according to step 1, set the Doppler frequency shift search order to be [ -2, 2, -3, 3, -1, 1, -4, 4, 0, -5, 5, -6, 6, -7, 7], the unit is kHz.
[0096] Obtained from step 2, when the Doppler frequency shift is 2kHz, the peak 3705 is more prominent, compared with the first peak 1531, the ratio is greater than the threshold 1.8, then it can be determined that the signal contains the signal of the PRN5 satellite, and the rough captured The Doppler frequency shift is 2kHz, and the corresponding code phase is 13001. There is no need to continue searching for the following Doppler frequency shifts. In order to clearly illustrate the correlation values at other Doppler frequency shifts, the correlation values are li...
Embodiment 2
[0104] Search the satellite signal of PRN8 satellite, set the intermediate frequency of the intermediate frequency digital signal to be 4.123968MHz, the sampling frequency is 16.367667MHz, and the Doppler frequency shift search step length is 1kHz when capturing, according to step 1, set the Doppler frequency shift search order to be [ -2, 2, -3, 3, -1, 1, -4, 4, 0, -5, 5, -6, 6, -7, 7], the unit is kHz. Through step 2, Table 3 is the correlation value of satellite PRN8 at each Doppler frequency shift. The peaks are relatively close, there is no prominent peak, the maximum peak is 1585, and the minimum peak is 1255, which does not satisfy the larger peak and smaller peak. If the ratio is greater than the set threshold of 1.8, the intermediate frequency digital signal does not contain the signal of the PRN8 satellite.
[0105] Table 3 Correlation peaks and code phases of PRN8 satellite at each Doppler frequency shift
[0106] Doppler shift
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Abstract
The invention discloses a signal acquisition method of a GPS receiver, and the method comprises the following steps: Step 1: searching order of Doppler frequency shift is set; Step 2: the GPS receiver receives an intermediate frequency digital signal, and rough acquisition is carried out on the signal, thus obtaining rough Doppler frequency shift and a C/A code phase; and Step 3: fine acquisition is carried out on the signal after the rough acquisition, thus obtaining fine Doppler frequency shift; in the method, through the rough acquisition of the intermediate frequency digital signal and according to motion characteristics of a carrier, frequencies which are more likely to occur in the Doppler frequency shift are firstly searched, and the order-jump search of the Doppler frequency shift reduces the Doppler frequency shift search times, reduces the search calculation and enhances the acquisition speed; and the fine acquisition of the intermediate frequency digital signal shortens the Doppler frequency shift search step size, and the fine Doppler frequency shift obtained by adopting conic fitting has the advantages of high speed, high precision, accurate acquisition results, easy operation and insensitivity to jump of navigation data bits.
Description
technical field [0001] The invention relates to a signal acquisition method of a GPS receiver, which belongs to the technical field of signal acquisition in satellite navigation. Background technique [0002] With the development of information technology, the satellite navigation system GPS (globel position system) appeared in the 1970s, which can provide high-precision and continuous position, speed, heading, and attitude for any place in the world at any time at a low cost and conveniently. and time information. Satellite navigation will change the system of air, sea and land traffic control and dispatching systems, provide more space for the development of transportation, and benefit the economy and safety of world sea, land and air transportation, such as for the Caribbean Sea The GPS satellite navigation system for the escort fleet, the GPS navigation system for passenger aircraft, and the future large aircraft will use the Beidou satellite navigation system. Therefo...
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