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GNSS signal double-step acquisition data symbol reversal elimination method and device

A technology for signal capture and data capture, which is applied in the field of signal processing and can solve problems such as CAF peak splitting of navigation data symbols

Pending Publication Date: 2019-04-05
HEFEI UNIV OF TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that in the existing GNSS signal acquisition technology, there is a problem of CAF peak splitting caused by the flipping of navigation data symbols

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  • GNSS signal double-step acquisition data symbol reversal elimination method and device
  • GNSS signal double-step acquisition data symbol reversal elimination method and device
  • GNSS signal double-step acquisition data symbol reversal elimination method and device

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Embodiment Construction

[0084] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0085] Such as figure 1 As shown, the GNSS signal two-step capture data symbol flip elimination method includes the following steps:

[0086] Step 1: According to the carrier-to-noise ratio of the received signal in the working environment of the GNSS receiver, adjust and select the optimal acquisition parameters to achieve GNSS signal acquisition in a specific signal environment. The acquisition parameters include the number of coherent integration cycles N and the number of non-coherent integration cycles K.

[0087] Step 2: Estimate the code phase delay during the first signal acquisition process To make the lo...

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Abstract

The invention discloses a GNSS signal double-step acquisition data symbol reversal elimination method and device, and relates to the technical field of signal processing. The GNSS signal double-step acquisition data symbol reversal elimination method comprises the steps that an optimal acquisition parameter is adjusting and selected; a code phase delay hat{tau<1>}in a first step of GNSS signal acquisition is estimated; the estimated code phase delay hat{tau<1>} in the first step of GNSS signal acquisition is extracted, so that a local pseudo code of a GNSS receiver is aligned with the navigation data symbol reversal position in a GNSS received signal; and the Doppler shift hat{f<d,2>}is estimated in the second step of GNSS signal acquisition, and GNSS signal acquisition results are comprehensively optimized. The GNSS signal double-step capture data symbol reversal elimination method and device have the advantages that the CAF main peak splitting effect caused by the data symbol reversal existed in GNSS signals is effectively eliminated, and the GNSS signal acquisition sensitivity is improved; and therefore, the GNSS signal double-step acquisition method effectively solves the problem of the GNSS signal data symbol reversal, improves the GNSS signal acquisition performance, and is effectively applied to a new generation of GNSS signals.

Description

technical field [0001] The present invention relates to the technical field of signal processing, and more specifically relates to a method and a device for eliminating GNSS signal double-step capture data symbol inversion. Background technique [0002] With the advent of new Global Navigation Satellite Systems (GNSS), such as Beidou, Galileo, and GPS modernization, new signals and new modulations are being introduced to meet the growing demand for location, navigation, and positioning services. Navigation data (telegram) sign flip may occur during any pseudo-code period of GNSS signal acquisition by the satellite navigation receiver. In general, GNSS signal acquisition sensitivity can be improved by integration techniques, for example, coherent integration and non-coherent integration. It is well known that increasing coherent integration time increases signal acquisition sensitivity, but the presence of sign flips in navigation data limits the optimal performance that can...

Claims

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Application Information

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IPC IPC(8): G01S19/30G01S19/33
CPCG01S19/30G01S19/33Y02D30/70
Inventor 孙克文
Owner HEFEI UNIV OF TECH
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