High sensitive quick capturing method for satellite signals
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A satellite signal and high-sensitivity technology, which is applied in the field of signal processing, can solve the problems of affecting the tracking success rate and long signal capture time, and achieve the effects of reducing the first positioning time, saving computing time, and improving capture speed
Inactive Publication Date: 2019-07-30
西安开阳微电子有限公司
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[0004] However, in the above-mentioned existing technical solutions, down-conversion and down-sampling must be done again after each modification of the code phase step and carrier phase step, resulting in a longer signal capture time, which in turn affects the success rate of tracking.
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Embodiment 1
[0060] In this embodiment, B1C satellite data of the third generation of Beidou is used, the data power of satellite data is -143dBm, the sampling rate of satellite data is 65.476MHz, and the intermediate frequency of satellite data is 3.996MHz. The data length used for capture is 800ms. For the continuous acquisition of the satellite whose satellite number is PRN19, the continuous accumulation is adopted at an interval of 1 second, the initial Doppler frequency is 0 Hz, the ending Doppler frequency is 2400 Hz, and the frequency step is 180 Hz; the original method has a frequency step of 60 Hz. Compare the results and operation time of the original capture method with the existing fast capture method scheme.
[0061] The experimental results are as follows:
[0062] Table 1 Acquisition results of satellite 19 existing methods
[0063] Initial Time Capture Time(s) proportional value Doppler frequency (Hz) code phase 000 7.09 2160 2720 001 8.00 216...
Embodiment 2
[0068] In this embodiment, B1C satellite data of the third generation of Beidou is used, the data power of the satellite data is -143dBm, the sampling rate is 65.476MHz, the intermediate frequency is 3.996MHz, and the capture time is 200ms. For the satellite whose satellite number is PRN58, the continuous capture is carried out at intervals of 1 second, the initial Doppler frequency is -4800Hz, the end Doppler frequency is +4800Hz, and the frequency step is 180Hz. At the same time, the existing schemes are compared. Table 3 Acquisition results of satellite 58 existing methods
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Abstract
The invention discloses a high sensitive quick capturing method for satellite signals. The method comprises the steps of S1, generating a main code FFT sequence, and initializing a Doppler frequency;S2, generating a sampling FFT sequence; S3, after the sampling FFT sequence is conjugated, multiplying by the main code FFT sequence and getting the modulus; S4, conjugating the FFT sequence after being subjected to forward cyclic shift, multiplying by the main code FFT sequence and getting the modulus; S5, conjugating the FFT sequence after being subjected to reverse cyclic shift, multiplying bythe main code FFT sequence and getting the modulus; S6, repeating the steps S3 to S5 for preset times, and accumulating the modulus to acquire an accumulated modulus; S7, reserving the maximum of theaccumulated modulus; S8, when the maximum accumulated modulus is more than a preset threshold, conducting the step S11, an when the maximum accumulated modulus is less than a preset threshold, conducting the step S9; S9, moving the Doppler frequency in a stepping manner, and repeating the steps S3 to S8; S10, moving the initial position of satellite data, and repeating the steps S2 to S9; and S11,outputting a result. According to the method, the capturing speed of the satellite signal is improved, the first positioning time is reduced, and the probability of error tracking is reduced.
Description
technical field [0001] The invention belongs to the field of signal processing, and relates to a high-sensitivity and fast acquisition method of satellite signals. Background technique [0002] In the process of positioning through satellites, it is first necessary to capture satellite signals, track them according to the capture results after capture, and output them for positioning according to the tracking results. The capture of satellite signals has become a major factor affecting positioning. [0003] The technical solution of the existing acquisition scheme is to modify the code phase step and the carrier phase step according to the Doppler frequency each time the acquisition is carried out according to the Doppler frequency step, and to perform down-conversion and down-sampling again, and finally obtain a non- Coherently accumulate the results to capture the signal. [0004] However, in the above-mentioned prior art solution, frequency down-conversion and down-samp...
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