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A high-sensitivity Beidou satellite b1i signal acquisition method

A Beidou satellite and signal acquisition technology, applied in the field of communication, can solve the problems of affecting tracking, decoding and positioning solution, coherent integration time limit, too long acquisition time, etc., to improve computing speed, shorten time, and overcome repetitive work. Effect

Active Publication Date: 2017-04-12
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this method is that the multi-phase coherent integration of m single periods needs to consider 2 m-1 When the signal is weak and the integration time is long, the number of phase combinations increases exponentially, the amount of calculation is large, and the capture time is too long, which will affect the follow-up tracking, decoding and positioning calculation, etc., so that the duration of coherent integration is limited

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  • A high-sensitivity Beidou satellite b1i signal acquisition method
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  • A high-sensitivity Beidou satellite b1i signal acquisition method

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[0050] Attached below figure 1 The implementation steps of the present invention are described in detail.

[0051] Refer to attached figure 1 , the implementation steps of the present invention are as follows:

[0052] Step 1, input Beidou satellite B1I signal.

[0053] The first step is to input the Beidou satellite B1I digital intermediate frequency signal. The input Beidou satellite B1I digital intermediate frequency signal is obtained after the Beidou satellite B1I signal received by the navigation receiver is amplified, down-converted and sampled.

[0054] The second step is to arbitrarily read continuous n×20 millisecond data from the input B1I digital intermediate frequency signal of the Beidou satellite. The duration of each navigation data bit is 20 milliseconds, and n represents the number of navigation data bits. It can be set according to the signal-to-noise ratio of the signal in the specific environment. When the signal-to-noise ratio is low, the value of n ca...

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Abstract

The invention discloses a high-sensitivity Beidou satellite B1I signal capturing method. The defects in the prior art that the computation burden is huge, the processing speed is slow, and a local recurrence signal is generated repeatedly are overcome. The method comprises the following steps that firstly, a Beidou satellite B1I signal is input; secondly, grouping is carried out on data; thirdly, partitioning is carried out on the data; fourthly, a data block is modulated by adopting a NH code; fifthly, overlapping is carried out on the data block; sixthly, the local recurrence signal is generated; seventhly, Fourier transformation is carried out; eighthly, a correlation value is obtained; ninthly, a non-coherent integration value is obtained; tenthly, a local recurrence signal frequency is changed; eleventhly, it is judged that whether the cycle times are less than 10 times or not, if the cycle times are less than 10 times, the eighth step is executed, and if the cycle times are not less than 10 times, the twelfth step is executed; twelfthly, capturing and detecting are carried out. Compared with the prior art, the high-sensitivity Beidou satellite B1I signal capturing method has the advantages of being high in processing speed, and good in capturing performance.

Description

technical field [0001] The invention relates to the technical field of communication, and further relates to a high-sensitivity Beidou satellite B1I signal acquisition method in the technical field of digital signal processing. The invention is suitable for capturing B1I signals emitted by high-sensitivity Beidou MEO / IGSO satellites, by processing the digital intermediate frequency signals of the B1I signals emitted by Beidou MEO / IGSO satellites received by the satellite navigation receiver through radio frequency amplification, down-conversion and sampling processing , to detect and capture satellite signals. Background technique [0002] Navigation satellite signal acquisition is the correlation operation between the input satellite signal and the local reproduction signal generated by the satellite navigation receiver (correlation operation refers to the multiplication of the input signal and the local reproduction signal, and then integration or accumulation), and then a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/24
CPCG01S19/24
Inventor 杜建超解娅宁李卫斌王庆雷岳丽娜肖嵩
Owner XIDIAN UNIV
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