Improved high-dynamic capture method, device and equipment and storage medium

Abstract

The invention provides an improved high-dynamic capture method, device and equipment and a storage medium. The method comprises the steps of employing an initial frequency step length to search a preset initial Doppler search range through a preset method, enabling a searched first satellite to serve as a search center according to the Doppler frequency obtained by the first satellite, according to a frequency shift range generated by the Doppler effect between the satellite and a receiver when the receiver is in a static state, obtaining a target Doppler search range, performing frequency interval division according to a preset frequency step length, and searching each frequency interval to capture satellite signals. According to the scheme, the relative movement of satellites is kept unchanged, and the frequency search range can be reset, so that the frequency range needing to be searched can be narrowed, the search times are reduced, the time for capturing the satellite is shortened, and the hardware resource overhead is also greatly reduced.

Description

technical field [0001] The invention relates to the technical field of signal capture, in particular to an improved high dynamic capture method, device, equipment and storage medium. Background technique [0002] In the case of static or low-speed motion, satellite signal acquisition mostly uses two-dimensional search technology. The two-dimensional search will be affected by the Doppler frequency between the receiver and the satellite. The larger the Doppler frequency, the more time processing will be required, resulting in slow capture speed, which cannot meet the real-time requirements of high dynamic environments. With the development of digital signal processing and other technologies, some new acquisition strategies have been researched and applied. In terms of high dynamics, the serial-parallel combination acquisition method is used to divide the two-dimensional search range of Doppler frequency offset and pseudo-random code into subintervals and utilize parallel cha...

AI Technical Summary

Problems solved by technology

The two-dimensional search will be affected by the Doppler frequency between the receiver and the satellite. The larger the Doppler frequency, the more time processing will be required, resulting in slow capture speed, which cannot meet the real-time requirements of high dynamic environments.

[0003] However, the current acquisition algorithm has the following problems: (1) The Doppler frequency shift is large. Because of the high-speed motion of the carrier, in addition to the Doppler effect generated by the satellite movement, the carrier itself will also produce a very large Doppler effect. The frequency offset of a few kHz or even hundreds of kHz requires more frequency searches when capturing satellite signals, resulting in a greatly increased capture time

(2) The cost of hardware resources is large and the implementation is complicated

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