Multi-long-code composite navigation signal phase consistency calibration method

Abstract

The invention provides a multi-long-code composite navigation signal phase consistency calibration method, which relates to the navigation satellite system's high precision application field. The method comprises: first, picking the pilot-frequency long-code baseband sample point data in a local composite navigation signal and a complex baseband navigation signal; performing relevant processing to the two and obtaining the relevant peak point sequence P; according to the picking length, picking the long-code baseband sample and determining the number of information bits M contained in the data code sub-channel of the navigation signal in the picking length; generating 2(M-1) possible information bit samples; carrying out frequency spreading to the picked local data long-code baseband sample and processing with the picked complex baseband navigation signal to determine the peak of each processing; solving the sample point sequence D corresponding to the biggest value of the peaks; and finally, solving the difference between D and P; and based on the sampling rate, calculating and obtaining the phase consistency of two long codes using the navigation signal pilot code as reference. With the method, it is possible to realize the precise calibration of the phase consistency of various codes of a navigation signal generator under the condition of multiple long codes.

Description

technical field [0001] The invention relates to a high-precision application field of a navigation satellite system, in particular to a phase consistency calibration method of a multi-length code composite navigation signal. Background technique [0002] The Global Navigation Satellite System (GNSS) has become an infrastructure. In order to improve the utilization of the navigation signal frequency band and meet the needs of users with different positioning accuracy, modern navigation signals often use multiple navigation signal supports. In the way of multi-channel multiplexing, multiple navigation signals with different pseudo-random codes and modulation modes are loaded on the same carrier frequency point at the same time, such as the E1 signal in the Galileo satellite signal system, which uses CBOC (6,1 , 4 / 33) and BOC (15, 2.5) modulation methods to generate three branch navigation signals including E1B signal containing data, E1C signal and E1A signal containing pilot ...

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Problems solved by technology

[0004] At present, the calibration method of the phase consistency of the navigation signal channel uses a high-speed oscilloscope to observe the envelope sink point in the constant-envelope navigation signal waveform. , and Frequency Control, Vol.52, No.11, pp1904-1911), this method can only realize simple BPSK modulation signal waveform, which is not suitable for modern multi-channel complex modulation signal waveform, and the calibration accuracy is poor, and the error reaches several 4~5ns

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