Multiplex binary offset carrier (MBOC) modulating signal fuzzy-free multi-path restraining method based on correlation function synthesis

Abstract

The invention discloses a multiplex binary offset carrier (MBOC) modulating signal fuzzy-free multi-path restraining method based on correlation function synthesis. The method includes the following steps: 1 acquiring a signal expression of MBOC modulating signals according to the characteristics of the signals; 2 breaking up an MBOC modulating signal self-correlation function obtained in the step 1 into a plurality of self-correlation functions; 3 combining the self-correlation functions according to the characteristics of the self-correlation functions and obtained in the step 2 to obtain a new correlation function, removing side peaks of the MBOC signals and achieving fuzzy-free tracking; 4 applying the anti-multi-path principle of a strobe technology to the new self-correlation function and utilizing linear synthesis of two kinds of different interval EML to achieve multi-path restraining to finally achieve fuzzy-free tracking and obtain a better multi-path restraining effect.

Description

technical field [0001] The present invention relates to an MBOC (Multiplexed Binary Offset Carrier--MBOC) modulated signal ambiguity-free multipath suppression method based on a synthetic correlation function, which belongs to the method of using a synthetic correlation function to eliminate the ambiguity problem existing in an MBOC modulated signal, thereby realizing MBOC modulation The technical field of unambiguous multipath suppression of signals. Background technique [0002] The signals in the new generation of the American GPS (Global Positioning Satellite) system, the EU's Galileo system and China's "Beidou II" navigation system will all use the binary offset carrier (Binary Offset Carrier--BOC) modulation method, and the BOC modulated signal The spectrum with a split form can reduce the mutual interference between navigation signals in the same frequency band, and the main peak of the BOC signal correlation function is narrow, which can ensure better system performa...

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Problems solved by technology

[0004] The purpose of the present invention is in order to solve the ambiguity and the problem of multipath suppression that exist when MBOC modulated signal is tracked, has proposed the method based on the MBOC modulated signal of composite correlation function without ambiguity multipath suppressed, at first draw its characteristic according to the characteristics of MBOC signal Autocorrelation function, decompose its autocorrelation function into multiple sub-correlation functions, synthesize new correlation functions from each sub-correlation function, and then apply the anti-multipath principle of strobe technology to the correlation function without side peaks, and propose a A linear combination of two sets of EML (Early Minus Late) at different intervals realizes an anti-multipath suppression technology without ambiguity, and finally realizes ambiguity-free tracking and better multipath suppression effect

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