Design And Implementation Of Intersatellite Links Target Acquisition And Tracking Receiver

With the continuous development of satellite communication technology, the inter satellite link communication system which works in the V-band has been used widely in the field of military communication because it can provide high anti-interference, high reliability, high security all-weather strategic communication and high invulnerability at the same time. Therefore, how to achieve V-band inter-satellite link confrontation under the circumstance of low SNR and complex spatial electromagnetic is of great importance for the modern information war to acquire the valuable military information.In this thesis, an acquisition and tracking receiver is designed for the capture and tracking of the V band inter-satellite link target. At first, the background and significance of the subject is discussed, and the present development situation of the tracking receiver is analyzed. Then the three kinds of automatic tracking systems of tracking receiver are analyzed, and the amplitude comparison single channel monopulse tracking system which is applicable to satellite borne acquisition and tracking receiver is determined, and the composition principle of single channel monpulse acquisition and tracking receiver is described at the same time. On this basis, this thesis has mainly completed the following work.Firstly, the basic composition of the acquisition and tracking receiver of the inter-satellite link target acquisition and tracking receiver is emphatically studied, and hardware circuit implementation scheme of the receiver is proposed. At the same time, the signal processing procedures of the receiver and the main function of the corresponding control interface are described.Secondly, the key signal processing algorithms for acquisition and tracking receiver are analyzed and simulated, including the band-pass sampling methods of input IF signal, the digital down conversion method based on polyphase filter, the signal detection algorithm based on Burg spectrum estimation, the frequency offset estimation algorithm based on the improved four-order transformation, the symbol rate estimation algorithm based on time delay multiplication and the modulation type identification algorithm based on the higher order cumulants. Two detection methods of signal energy are analyzed in the angle error demodulation module, and the error voltage of azimuth and elevation is demodulated by using the signal energy detection algorithm based on differential coherent accumulation. The correctness and feasibility of the algorithm of the digital down conversion, signal detection, parameter estimation and angular error demodulation are verified by using the MATLAB simulation.Thirdly, according to the proposed hardware circuit scheme, the hardware circuit verification platform of the acquisition and tracking receiver is built. At the same time, the main function of each hardware module is analyzed. In this platform, the proposed signal processing algorithm is debugged and verified, the key is the testing and verification about the three core modules, including the digital down conversion, the signal envelope energy detection and the angular error information demodulation. The testing results shows that the proposed signal processing algorithm is verified correctly and effectively by the designed inter-satellite link target acquisition and tracking receiver, and the expected results have been achieved.