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

A joint acquisition and signal technology, applied in the field of satellite navigation and positioning, can solve problems such as high consumption of hardware resources, accidental capture, and incomplete elimination of secondary peaks, and achieve the effect of improving capture accuracy, avoiding accidental capture, and improving the main peak-to-peak value.

Active Publication Date: 2018-02-13
GUILIN UNIV OF ELECTRONIC TECH
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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%

Method used

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

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Embodiment 1

[0035] see figure 1 The method for joint acquisition of GPS L1C / A and L1C signals provided by Embodiment 1 of the present invention includes the following steps:

[0036] S101. Receive a composite signal of a GPS L1C / A signal and an L1C signal.

[0037] Since the carrier phase of the L1C signal is the same as that of the L1P(Y) military signal, the data of the L1C signal and the pilot component are in phase quadrature with respect to the L1C / A signal, and the mathematical model of the composite signal of the GPS L1C / A signal and the L1C signal as follows:

[0038]

[0039] Among them, C is the total power of the composite signal, the power allocation parameters α=0.4391, β=0.1464, γ=0.4145, d P (t) is the secondary code of the L1C pilot channel, d D (t) and d C / A (t) are the navigation messages of L1C and L1C / A respectively, c P (t), c D (t) and c C / A (t) are L1C pilot code, L1C data code and L1C / A code sequence respectively, g P (t) and g D (t) are the subcarriers...

Embodiment 3

[0110] Figure 15 A specific structural block diagram of the satellite navigation receiver provided by Embodiment 3 of the present invention is shown, the satellite navigation receiver 100 includes:

[0111] one or more processors 101;

[0112] memory 102; and

[0113] One or more computer programs, wherein said one or more computer programs are stored in said memory 102 and are configured to be executed by said one or more processors 101, said processors executing said computer programs The steps of realizing the joint acquisition method of GPS L1C / A and L1C signals as provided in Embodiment 1 of the present invention.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30G01S19/37
CPCG01S19/29G01S19/30G01S19/37
Inventor 纪元法刘媛孙希延朱亮亮付文涛郭小娟李有明蔚保国甘兴利欧阳缮廖桂生
Owner GUILIN UNIV OF ELECTRONIC TECH
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