Beidou satellite navigation signal capturing method based on NH code element jumping detection

Abstract

The invention discloses a Beidou satellite navigation signal capturing method based on NH code element jumping detection, and belongs to the technical field of methods for processing base band signals of satellite navigation receivers. The Beidou satellite navigation signal capturing method includes the steps that the thoughts of NH code element matching and a TONG detector are adopted, circle correlation operation is carried out on the condition that NH code element jumping exists in intermediate frequency navigation satellite signals every millisecond and the condition that NH code element jumping does not exist in the intermediate frequency navigation satellite signals every millisecond, a parallel code phase searching method is applied to the circle correlation operation, pre-detection integral time is set to be K ms, the results of the circle correlation operation every millisecond are accumulated according to various assumed combinations of the NH code element jumping, the combination result with the largest value is compared with a detection threshold value, and a signal capturing result and the initial position of a navigation information bit are judged according to processing results of the TONG detector and a bit asynchronous detection module. The coherent integration time is prolonged under the condition that influences of NH code elements are eliminated, and navigation information bit synchronization is achieved while capturing is successful.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to a baseband signal processing method of a satellite navigation receiver. Background technique [0002] The satellite navigation system is widely used and can provide users with accurate position and time information. The development of GPS (Global Positioning System) has been very mature. At the same time, the technical research of high-performance GPS receivers is also progressing with the expansion of the application environment. With the development of Beidou satellite navigation system, the technical research on its receiver has certain theoretical value. Acquisition is the first part of the receiver, so the acquisition algorithm is the key to the signal processing of the Beidou navigation receiver. [0003] Satellite acquisition is essentially a parameter estimation process, which is to estimate and detect the Doppler frequency and code delay parameters of the satellite's...

AI Technical Summary

Problems solved by technology

[0006] Technical problem to be solved: Aiming at the deficiencies in the prior art, the present invention proposes a Beidou satellite navigation signal acquisition method based on NH symbol jump detection, which is used to solve the problem of NH code symbol jump and The technical problem that the navigation information bit flip phenomenon affects the judgment of the receiver's capture result

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