A method and system for quickly capturing signals of a relay satellite measurement and control system

Abstract

The invention discloses a method and a system for rapidly capturing a relay satellite measurement and control system signal. The method comprises the following steps: S1, analog-to-digital conversion: performing band-pass sampling on an analog intermediate-frequency signal through a high-speed analog-to-digital converter by comprehensive digital baseband equipment to obtain a digital intermediate-frequency signal; S2, down-sampling processing; S3, implementation of a capturing time shorter than a data sampling time: controlling two memories to implement seamless caching of data streams, wherein a caching depth is a sampling number of coherent integration, and a switching interval between the two memories is a sampling time of captured data; and S4, implementation of a search of a signal dynamic range: converging a Doppler frequency range by adopting a two-round frequency search according to a speed of outputting a frequency search unit result in a data sampling period, and obtaining a code phase offset of cached data in a third-round phase search. The system is used for implementing the method. The method and the system have the advantages of easiness in implementation, high accuracy, capability of satisfying a current engineering condition, and the like.

Description

technical field [0001] The invention mainly relates to the field of data relay satellite systems, in particular to a method and system for quickly capturing relay satellite measurement and control system signals, which are suitable for integrated digital baseband equipment for relay satellite-borne direct sequence spread spectrum measurement and control transponders. Background technique [0002] The Tracking and Data Relay Satellite System (TDRSS) is a measurement and control communication system that uses geostationary satellites and ground terminal stations to perform high-coverage measurement and control and data relay for medium and low orbit aircraft. Utilizing this technology can improve the measurement and control coverage of low-orbit satellites and increase the satellite's on-orbit measurement and control time. At present, the relay measurement and control is mainly used as a supplement to the satellite-ground measurement and control, and the relay measurement and ...

AI Technical Summary

Problems solved by technology

The disadvantage of the traditional sliding correlation acquisition method is that every time a parallel code phase search needs to read the real-time sampled mixing signal for coherent integration, the acquisition processing time under each frequency search unit will be severely limited by the parallel search code The number of channels related to the phase, the capture time is mainly limited by the capture processing time

Under the condition of the sensitivity of the relay satellite measurement and control signal, the data integration time will increase exponentially, and the capture time will increase exponentially, eventually making the capture time too long to adapt to the dynamic range of the spacecraft

In this case, to reduce the acquisition processing time, the only way to reduce the acquisition processing time is to increase the number of parallel search code phase correlation channels, which is difficult to achieve in the case of limited spaceborne equipment resources

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