A high-precision acquisition method for satellite signals

A satellite signal, high-precision technology, applied in the field of signal processing, can solve the problems of large missed capture probability, unsuccessful traction, tracking failure, etc., to achieve the effect of accurate sampling points and improve the success rate of capture and tracking.

Active Publication Date: 2021-01-29
西安开阳微电子有限公司
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  • Abstract
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Problems solved by technology

[0004] However, the above-mentioned existing schemes will cause a relatively large probability of missed capture and unsuccessful pulling. large, which leads to tracking failure

Method used

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  • A high-precision acquisition method for satellite signals
  • A high-precision acquisition method for satellite signals
  • A high-precision acquisition method for satellite signals

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Experimental program
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Embodiment

[0102] In this embodiment, GPS satellite data is used, data power: -146dBm, sampling rate: 16.367667MHz, intermediate frequency: 4.123968MHz. The data length used for capture is 800ms. Compared with the difference between the original method and the high-precision method, due to the difference in the initial conditions after capture (code phase, Doppler), the stability after entering the tracking (whether it is stable, or the length of time it takes to stabilize) The difference, from which to judge the pros and cons of high precision. Under the power of -146dBm, the tracking of 1ms cannot keep up, and the long integral tracking mode of 20ms must be adopted. In the 20ms long integration tracking mode, both the initial tracking sampling point (depending on the captured code phase) and the initial Doppler frequency will affect whether the tracking is stable.

[0103] Using this method to capture, two 3X3 arrays are obtained as shown in Tables 5 and 6:

[0104] Table 5 Odd cumul...

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Abstract

The invention discloses a satellite signal high-precision acquisition method, comprising: step 1: selecting a satellite and generating a corresponding main code FFT sequence, and initializing the Doppler frequency; step 2: generating a sampling FFT sequence according to satellite data; step 3: Take the conjugate of the sampling FFT sequence and multiply it with the main code FFT sequence, and take the modulus after performing IFFT on the multiplication result to obtain the initial modulus value; step 4: repeat step 3, and accumulate the initial modulus value obtained by each repetition, Get the accumulated modulus; step 5: move the Doppler frequency step by step; repeat steps 3 and 4 for each step; step 6: select the maximum value of all accumulated moduli and keep it; step 7: take the maximum value and the maximum Subsequent values ​​of the index of the value are combined and operated to obtain more accurate code phase estimation and Doppler frequency offset estimation and output them. The method greatly improves the capture success rate and tracking success rate, and accelerates the speed of tracking bit synchronization.

Description

technical field [0001] The invention belongs to the field of signal processing and relates to a method for capturing satellite signals with high precision. 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 existing acquisition scheme is to use the maximum value mode for discrimination under the condition of low carrier-to-noise ratio, that is, according to the long integration results of all Doppler, select the maximum value, track the position of the maximum value, and determine the corresponding Doppler Doppler frequency and code phase, and then perform long integration on this basis to find the starting sampling point of the tracking and the starting value of the bit, on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 邓一鹗汤加跃师强强张柏华
Owner 西安开阳微电子有限公司
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