A high-performance acquisition and decision method for wireless signals in the inter-satellite link of navigation satellites

Abstract

The invention discloses a high-performance capturing and judging method for an intersatellite link wireless signal of navigation satellites, and the method comprises the steps: S1, carrying out the digital orthogonal demodulation of a received signal, and obtaining a complex number baseband signals composed of I / Q signals; S2, carrying out the resampling of the complex number baseband signals, obtaining detection statistical quantities through coherent integration, detection and incoherent integration, searching the maximum value of all detection statistical quantities, recording the grid position of the maximum value, adjusting the searching range after the first detection, carrying out multiple detection, and verifying the consistency of the grid positions of the maximum value; S3, judging whether the capturing is successful or not according to the verifying result. The method is adapted to the intersatellite time-variant characteristics, improves the capturing sensitivity, and achieves the quick capturing.

Description

technical field [0001] The invention mainly relates to the technical field of wireless communication and measurement, in particular to a high-performance acquisition and judgment method suitable for navigation satellite inter-satellite link wireless signals. Background technique [0002] The Global Navigation Satellite System (GNSS) can provide all-weather precise position and time information for any place in the earth and near-Earth space. In the global satellite navigation system, maintaining high satellite orbit determination accuracy and clock error determination accuracy is the key to ensure that the navigation receiving terminal obtains the positioning or timing accuracy required by the large system. [0003] The demand for inter-satellite ranging function for precise orbit determination and time synchronization of navigation satellites gave birth to the concept of navigation constellation inter-satellite link. Once the link is established between the navigation sate...

AI Technical Summary

Problems solved by technology

Inter-satellite links need to quickly switch the link building object, causing the antenna pointing to jump, causing the time-varying characteristics of the background noise, making it necessary to re-statistic the noise distribution every time the link is established. However, under the condition of fast signal acquisition, only Can rely on fewer data samples for noise statistics, which can easily cause deviations in statistical results, resulting in inaccurate thresholds, thus affecting capture performance

In addition, the setting of the threshold improves the energy standard of the detection statistics, which will reduce the capture sensitivity, which is not conducive to weak signal capture

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