The Study Of Signal Processing For The Mode S Secondary Surveillance Radar Of Air Traffic Control

The national air traffic control system (ATC) of our country is Air Traffic Control Radar Beacon System (ATCRBS). Along with the development of the aviation carrying trade and the growth of the aero quantity, the ATCRBS capacity will be saturated at busy time, and because of synchronous crosstalk and asynchronouse interference, ATCRBS is overloaded and the track is interruptted, this tendency which lead to an aviation accident is more and more obvious. The Monopulse Secondary Surveillance Radar (MSSR) with function of Mode S can work in the ATCRBS and data link of groud and air, so it improves the air traffic processing ability of the ATC at peak time.The Mode S system is a kind of tendency for development, it maintains the ATCRBS function and the specific function of Mode S additionally.The method of ATC in the world is in the transition period of ATCRBS and Mode S. The aircrafts are equipped two kinds of responser currently, the one is ATCRBS, and the other is Mode S. So MSSR with Mode S should have compatible capability for this. This thesis discussion is the several key technique for signal processing of radars with Mode S. Firstly working mode of radar is considerated. The appropariate working mode can make radar inquire the interrogations to aircrafts equipped with ATCRBS and Mode S responser, and process all kinds of replies with no missing. The second one is generating the Mode S interrogation framework and encoding the data of interrogation. The third one is exact detection Mode A/C and the Mode S reply frame. The fourth one is decoding the Mode S reply data. The fifth one is encoding and decoding for Mode S.The whole system has been achieved by using the large-scale field programmable gate array (FPGA) of Xilinx. Its good aspects are low power consumption, low cost, high integration level, high reliability and vivid design method.