Method for rapidly capturing Beidou satellite signal based on FFT
A Beidou satellite and signal technology, applied in the field of satellite navigation, can solve the problems of large number of signal FFT calculation points, increased algorithm resource consumption, unfavorable algorithm implementation, etc., and achieve the effect of flexible algorithm operation structure, simple fusion algorithm, and increased algorithm resource consumption
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[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0047] figure 1 Shown is a schematic diagram of a traditional parallel code phase acquisition algorithm in the prior art.
[0048] figure 2 It is a schematic diagram of the P-FFT-based Beidou B2 signal fast acquisition method of an embodiment of the present invention, image 3 is a flowchart of the method.
[0049] The process of the method of the embodiment of the present invention comprises the following steps:
[0050] Step 1. Determine the local carrier frequency and search step size according to the received Beidou satellite signal intermediate frequency frequency and Doppler frequency shift range, generate a local carrier signal and perform a carrier removal operation on the input signal to generate a mixed frequency signal; the carrier removal operation The process is:
[0051] x 1 (n)=s 1 (n)*f 1 (n) (1)
[0052] Among them, ...
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