Satellite navigation signal synthesis power spectrum deviation calculation method

A satellite navigation signal and signal power spectrum technology, applied in the field of satellite navigation, can solve the problem of insufficient evaluation of the actual difference between the actual signal power spectrum and the theoretical spectrum, cannot reflect the difference between the measured signal power spectrum and the theoretical spectrum, and cannot be known. The specific details, characteristics, variation range and stability of the difference curve can improve the accuracy and reliability.

Pending Publication Date: 2022-02-25
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

However, this calculation method actually only evaluates whether the power spectrum difference curve is symmetrical, and cannot reflect the degree of difference between the measured signal power spectrum and the theoretical spectrum, nor c

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  • Satellite navigation signal synthesis power spectrum deviation calculation method
  • Satellite navigation signal synthesis power spectrum deviation calculation method
  • Satellite navigation signal synthesis power spectrum deviation calculation method

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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0022] The flow chart of the present invention is as figure 1 As shown, the specific method is as follows:

[0023] (1) First of all, use a relatively high-gain antenna (gain greater than 40dBi) located in a clean electromagnetic environment and without the influence of ground multipath to receive satellite downlink navigation signals, and use high-speed data acquisition equipment to collect satellite signals (for higher accuracy) For offline analysis, the sampling frequency must be greater than or equal to 250MHz, and the number of bits must be greater than or equal to 12), and stored in the data disk array. Using a high-gain antenna located in a clean electromagnetic environment and without the influence of ground multipath for signal observation and reception, the main ...

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Abstract

The invention provides a satellite navigation signal synthesis power spectrum deviation calculation method which comprises the following steps: receiving a satellite downlink navigation signal, and collecting the satellite signal; analyzing and processing the collected data, and reproducing an ideal signal corresponding to the actually measured signal; calculating an actually measured signal power spectrum and a theoretical signal power spectrum; and evaluating signal power spectrum characteristics by using the weighted correlation coefficient, calculating a weighted RMS value of a difference curve, calculating a peak-to-peak value of the difference curve, calculating a mean value and a standard deviation of the difference curve, and analyzing the symmetry of the power spectrum. According to the method provided by the invention, the power spectrum characteristics of different types of signals can be evaluated by adjusting different weighting coefficients, and the power spectrum characteristics of the actually measured signals can be intuitively reflected.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and in particular relates to a satellite navigation signal processing method. Background technique [0002] Satellite navigation systems are playing an increasingly important role in every aspect of people's lives. The satellite navigation signal is the only interface between the satellite navigation system and the user receiver, and its signal quality will directly affect the service performance of the entire satellite navigation system. At present, more and more institutions or organizations at home and abroad have joined and carried out the monitoring and evaluation of satellite navigation signals. One of the more important and intuitive methods is to analyze the power spectrum characteristics of satellite signals. [0003] Frequency domain characteristics are the most intuitive reflection of signal characteristics. It can analyze which frequency harmonic components (sine and cos...

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Application Information

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IPC IPC(8): G01S19/23G01R23/02
CPCG01S19/23G01R23/02
Inventor 贺成艳杨倩倩郭际卢晓春
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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