Mode S Data Processing, Response Processing

Mode S is the next generation SSR (Secondary Surveillance Radar) system. Mode S provides enchanced surveillance and complete air-ground data link capability, as well as A/C mode function of traditional SSR. Mode S system is widely used abroad, but the study on Mode S has just started internally.In this thesis, the data process of Mode S Extended reply is the main research object. The basic principle of Mode S system has been analyzed. Then the algorithm of Mode S Extended reply Enhanced Reception Techniques is analyzed, the hardware realization based on FPGA and DSP is expounded, simulation results of the main module is given. The main contents are as follows:1. Mode S Extended Squitter Enhanced Reception Techniques, including preamble detection, re-triggering and data process, are investigated in detail.2. Bit and confidence declaration using both AMP and OBA signal from radar.3. Error correcting cyclic redundancy checks based on confidence declaration is studied in detail.4. The implementation of Mode S algorithm in hardware architecture of FPGA and DSP.5. Mode S data link has been studied preliminarily.