Capturing method of Beidou second-generation B1 signals and system thereof

Abstract

The invention provides a capturing method of Beidou second-generation B1 signals and a system thereof. The capturing method comprises steps of 1: changing processed a B1 signal received by an antenna into a digital intermediate frequency signal; 2: receiving the digital intermediate frequency signal, peeling carrier waves, extracting and then storing data; 2: interpolating the data; 3: searching the data and peeling the carrier waves; 4: performing DFT for the data on 4 points; 5: peeling carrier waves for the data, performing FFT, then performing IFFT, obtaining related peak results, and then processing all data so as to related peak results; and 6: sequencing the related peak results, wherein if the biggest peak value is larger than a captured threshold, it shows that the B1 signal has been captured, and otherwise, the B1 signal has not been captured. The invention also provides a capturing system of the Beidou second-generation B1 signals. According to the invention, 4ms coherent integration of the B1 signals can be achieved, capturing sensitivity of the B1 signals is increased and balance between computation amount and capturing sensitivity can be obtained.

Description

technical field [0001] The invention relates to the field of a Beidou second-generation satellite navigation system, in particular to a method for capturing B1 signals of the Beidou second-generation satellite and a system thereof. Background technique [0002] The global satellite navigation system is a very important space information infrastructure. It can not only be used in the fields of military, disaster reduction and relief, and public safety, but also gradually play a huge role in many civilian fields such as personal navigation, traffic management, telecommunications, and fishery. At present, in the civilian market, the demand for location-based service applications has increased sharply, and the integration of satellite navigation systems with the Internet, transportation, and communications has become increasingly close. Various taxi software, bus query software, and business promotion services all require the support of navigation and positioning systems. Satell...

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is to provide a method for capturing the B1 signal of the Beidou second-generation satellite, which solves the problem of sign bit inversion caused by the secondary code modulation technology, and is based on the secondary code NH modulated in the B1 signal The characteristics of the code, traverse and search for the sequence that is not affected by the sign bit jump, and perform a fixed-time coherent integration capture on the sequence to improve the capture sensitivity of the B1 signal

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