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Low-updating-frequency satellite navigation carrier wave tracing method

A technology of satellite navigation and carrier tracking, which is applied in the field of satellite navigation and can solve problems such as carrier tracking loop loss of lock

Active Publication Date: 2018-04-03
湖南跨线桥航天科技有限公司
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AI Technical Summary

Problems solved by technology

In the case of reducing the frequency of loop processing, factors such as relative motion between the satellite and the ground and clock drift will inevitably lead to the accumulation of large carrier phase errors during the correlation accumulation period
When the carrier phase error exceeds the pulling range of the phase detector, the carrier tracking loop may lose lock

Method used

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  • Low-updating-frequency satellite navigation carrier wave tracing method
  • Low-updating-frequency satellite navigation carrier wave tracing method
  • Low-updating-frequency satellite navigation carrier wave tracing method

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Embodiment Construction

[0072] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0073] In the processing cycle of a single carrier tracking loop, the GPU completes multiple pre-detection accumulations at the same time, and estimates the carrier phase and Doppler frequency errors based on multiple correlation accumulation values; the CPU uses them as observations of the Kalman filter, after After loop filtering, configure the relevant accumulation parameters of the GPU in the next cycle, and finally complete the carrier loop tracking.

[0074] Such as figure 1 As shown, a satellite navigation carrier tracking method with low update frequency includes the following steps in the processing cycle of a single carrier tracking loop:

[0075] According to the estimated value of the carrier tracking loop state vector set by the CPU in the previous processing cycle, the GPU predicts the carrier phase, Doppler frequency and Dopple...

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Abstract

The invention discloses a low-updating-frequency satellite navigation software receiver carrier wave tracing method. The method includes that in a single processing period of a carrier wave tracing loop, a GPU completes multiple times of pre-detection accumulation at the same time and estimates carrier wave phase prediction and Doppler frequency error according to multiple related accumulated values; the CPU takes the error as observation quantity of a Kalman filter, corrects a prediction value, configures related accumulation parameters of the GPU of the next period after loop filtering and finally completes carrier wave loop tracing. Compared with conventional carrier wave tracing algorithms, the method has the advantage that stability and accuracy of carrier wave loop tracing can be ensured at low processing frequency.

Description

technical field [0001] The present invention relates to the technical field of satellite navigation, specifically a satellite navigation carrier tracking method with low update frequency, which can be used in satellite navigation software receivers based on GPU (graphics processing unit) or other software radio receivers based on GPU middle. Background technique [0002] Carrier tracking is a key link in the signal processing of satellite navigation receivers, and its stability and accuracy directly determine the performance of the receiver. GPU has many advantages such as strong parallel computing capability, high efficiency and flexibility in development, so it is widely used in satellite navigation software receivers. In a GPU-based satellite navigation software receiver, the carrier tracking loop is usually processed by the CPU (Central Processing Unit), and the GPU completes the correlation accumulation. If the carrier tracking loop still adopts the traditional method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/37
CPCG01S19/29G01S19/37
Inventor 屈晓阳马学新潘芳香杨国锋易枝独秀赵芳芳
Owner 湖南跨线桥航天科技有限公司
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