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

A technology for navigation signal and hopping detection, which is applied in the field of satellite navigation and can solve problems such as affecting receiver acquisition results.

Active Publication Date: 2015-03-25
SOUTHEAST UNIV
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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 det

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

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings.

[0048] figure 1 It is a traditional serial acquisition algorithm. After the intermediate frequency navigation satellite signal is sampled, it is multiplied by the local spreading code signal with a preset code delay, and then it is multiplied with the in-phase component and quadrature component of the local carrier with a preset Doppler frequency. Integrate after multiplication, the integration results of the in-phase branch and the quadrature branch are squared and then accumulated to obtain the detection value. Compared with the present invention, the traditional serial acquisition method is due to the serial search of Doppler frequency and code delay, and the signal processing time is greatly increased; meanwhile, the traditional acquisition method does not take into account the symbol jump and the navigation information bit Sign flipping will reduce the detection ...

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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...

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 樊祥宁朱灿孟苑王志功
Owner SOUTHEAST UNIV
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