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Beidou navigation system D1 navigation message capture method

A Beidou navigation system and navigation message technology, applied in the field of navigation signal detection, can solve the problems of limited coherent integral gain, unfavorable for hardware implementation, unsatisfactory capture effect, etc., to increase capture gain, reduce computational complexity, and improve capture accuracy. degree of effect

Active Publication Date: 2015-10-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

The zero extension method can eliminate the correlation peak splitting caused by bit jumps, but the algorithm characteristics limit the coherent integration gain, and the capture effect is not ideal when the input signal carrier-to-noise ratio is low
The two-step capture method can reduce the impact of bit jumps on capture, but it takes a long time and requires a lot of calculation, and the capture effect is not ideal when the carrier-to-noise ratio is low
The NH code synchronous acquisition method can reduce the impact of bit jumps and can obtain a large gain, but the amount of calculation is large, which is not conducive to hardware implementation

Method used

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  • Beidou navigation system D1 navigation message capture method
  • Beidou navigation system D1 navigation message capture method
  • Beidou navigation system D1 navigation message capture method

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Embodiment Construction

[0024] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0025] The invention provides a method for capturing the D1 navigation message of the Beidou navigation system.

[0026] The Beidou receiver receives satellite signals submerged in additive Gaussian white noise through the receiving antenna, and is processed by down-conversion, filter amplification and analog-to-digital conversion (Analog-to-Digital Converter, ADC) at the RF front end, regardless of the filter The influence of loss and quantization noise, assuming that the additive Gaussian white noise sequence is independent and uncorrelated, according to the Beidou navigation system D1 navigation message generation rules and the working principle of the radio frequency part of the conventional Beidou receiver, the expression of the signal received by the baseband signal processing module can be obtained as :

[0027]

[0028] s[k] is the signal seque...

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Abstract

The invention discloses a Beidou navigation system D1 navigation message capture method. The method can adapt to all kinds of bit jump, increases the coherent integral gain, eliminates erroneous carrier frequency estimation caused by correlation peak splitting, and can be used to effectively and reliably capture a Beidou navigation system D1 navigation message. The method comprises the following steps: multiplying the signal sequence of a received D1 navigation message containing interference by a local carrier complex sequence and carrying out frequency mixing to realize carrier Doppler frequency offset stripping; then, expanding a local repetition code in two ways at the same time to obtain a local repetition code A and a local repetition code B; performing correlation operation on each of the two local repetition codes and the frequency mixing result; judging the results of the two correlation operations to obtain a carrier Doppler frequency offset estimated value fd and a ranging code phase delay estimated value Tau; and capturing the D1 navigation message.

Description

technical field [0001] The invention relates to the technical field of navigation signal detection, in particular to a method for capturing D1 navigation text of a Beidou navigation system. Background technique [0002] BeiDou Navigation Satellite System (BDS) is a Global Navigation Satellite System (GNSS) independently developed and operated by China. The Beidou receiver is responsible for receiving the signals transmitted by the Beidou satellites, and after processing, obtains information such as navigation messages to realize the positioning function. To achieve the above functions, the receiver first needs to complete the acquisition of satellite signals. The signal acquisition process is a three-dimensional search process for the received signal satellite number, carrier Doppler frequency offset and ranging code phase delay. When the local reference sequence and the corresponding numbered satellite When the signals are roughly synchronized and the frequencies are appro...

Claims

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 甘明刚王力陈杰窦丽华邓方蔡涛白永强
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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