Beidou B1I signal capturing method based on coherent downsampling

A signal capture and down-sampling technology, which is applied in the field of satellite navigation, can solve the problems of large data volume and fast capture of unfavorable signals, and achieve the effects of fast capture, reduced computational complexity, and simple structure

Active Publication Date: 2019-07-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the bandwidth of the satellite signal after the code phase is stripped is reduced to about 10kHz, and maintaining a high sampling frequency will make the amount of data involved in the FFT operation very large, which is not conducive to the rapid capture of the signal

Method used

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  • Beidou B1I signal capturing method based on coherent downsampling
  • Beidou B1I signal capturing method based on coherent downsampling
  • Beidou B1I signal capturing method based on coherent downsampling

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Embodiment Construction

[0043] The present invention will be further explained below in conjunction with the accompanying drawings.

[0044] The schematic diagram of the parallel frequency acquisition algorithm based on coherent downsampling is shown in figure 1 shown. During specific implementation, the receiving antenna can convert the electromagnetic wave signal emitted by the Beidou satellite into a voltage signal or a current signal, and then send the signal to the radio frequency front end for processing. After being filtered and amplified by the pre-filter and pre-amplifier in the RF front-end module, the signal becomes an intermediate frequency signal with a lower frequency and a higher carrier-to-noise ratio, and then sampled by the A / D converter to obtain a digital intermediate frequency signal expression The formula is:

[0045]

[0046] Among them, n represents the nth sampling data in the data points of the discrete signal obtained after sampling; j is the PRN code; A j is the sign...

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Abstract

The invention provides a Beidou B1I signal capturing method based on coherent downsampling. Through a coherent downsampling sampling mode, the number of points participating in FFT is reduced, the sampling frequency is not limited to a fixed frequency point any more, the calculation complexity of a capture algorithm is reduced, the structure is simple, the capture efficiency is effectively improved while the signal-to-noise ratio is not influenced, and rapid capture of the Beidou B1I signal can be realized.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and relates to a method for capturing satellite signals, in particular to a method for capturing Beidou B1I signals based on coherent downsampling, which is suitable for capturing the Beidou B1I signals. Background technique [0002] The Beidou satellite navigation system is a global satellite navigation system developed by China itself, which is committed to providing stable and reliable satellite navigation services for global users. Signal acquisition is a key technology in the Beidou system software receiver, which is used to search for all visible satellites and obtain rough values ​​of pseudo code phase and Doppler frequency shift of the corresponding satellites. [0003] The traditional acquisition methods include serial frequency acquisition method, parallel code phase acquisition method and parallel frequency acquisition method. The core idea of ​​the three algorithms is to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24
CPCG01S19/246
Inventor 高唱曾庆喜陈则王吕查德
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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