GPS L1C/A and L1C signal collective capturing method and satellite navigation receiver

Abstract

The invention is applicable to the technical field of satellite navigation locating, and provides a GPS L1C / A and L1C signal collective capturing method and a satellite navigation receiver. Accordingto a GPS L1C / A and L1C signal collective capturing algorithm based on unit correlation, an L1C / A code sequence and an L1C sequence which are generated locally are split into an odd unit signal and aneven unit signal respectively through a thought of splitting and reorganizing, unit correlation functions of a unit signal and a received composite signal are reorganized, then the two reorganized correlation functions are multiplied, and envelope squares are detected. By means of the GPS L1C / A and L1C signal collective capturing method and the satellite navigation receiver, 9 subsidiary peaks generated by L1C / A signals in collective capturing are completely removed, the problem of capturing by mistake is avoided, the capturing sensitivity is improved, the correlation peak span obtained through the algorithm is 0.5 chip, and the capturing precision is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and in particular relates to a joint acquisition method of GPS L1C / A and L1C signals and a satellite navigation receiver. Background technique [0002] Currently, the L1 frequency band is the only frequency band with two different GPS (Global Positioning System, Global Positioning System) civilian signals, that is, GPS users can receive traditional L1C / A signals and new L1C signals on the same frequency. The L1C / A signal is modulated by binary phase shift keying (BPSK). The L1C signal has a dual-channel structure of a pilot channel and a data channel. The data channel adopts BOC (1,1) modulation, and the pilot channel adopts TMBOC (6,1,4 / 33) modulation. The same-frequency L1C / A and the navigation message information modulated by the L1C signal are synchronous, and the code delay of L1C / A is the same as that of the data code and pilot code of the L1C signal. The join...

AI Technical Summary

Problems solved by technology

However, since the period of the L1C / A signal is 1ms, and the period of the L1C signal is 10ms, there are 9 sub-peaks in the detection amount obtained by traditional joint capture, which may easily lead to the problem of false capture

The traditional joint acquisition scheme includes: joint acquisition of one or three channels, the local L1C data code, pilot code and L1C / A code are correlated with the received signal respectively, and the detection quantity is the sum of the squares of the three channels, making full use of the signal energy, but the sub-peak suppression effect is not obvious, and the hardware resource consumption is more; 2. Single-channel joint capture, using the linear combination of C / A code, L1C pilot and data code to generate local composite code, realized in a single channel Capture saves hardware resources, and the span of the correlation peak is 1 chip, but this method still does not completely eliminate the secondary peak; 3. The dual-channel joint capture of the pilot component of L1C and the L1C / A code signal, using the coherent method , correlate the local pilot code and C / A code with the received signal respectively, and obtain a sharper detection peak, but this method wastes the energy of the L1C signal data channel, and cannot reflect the structural advantages of the new civilian L1C signal dual-channel, and There are still 9 secondary peaks, and the peak-to-peak ratio of the secondary peak to the main peak reaches 50.96%

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