| As international warfare issues become increasingly urgent day by day, traditional electronic warfare systems for self-protection are growing to be the key equipment for targets attack. Electronic warfare simulation correspondingly permeates throughout the entire develop cycle from theoretical verification to equipment performance evaluation. It truly reproduces non-renewable constantly changing complex electromagnetic environment with good scalability and versatility.In this thesis, a typical airborne electronic support measure(ESM) system based on Matlab/Simulink is achieved. The ESM system is built on the basis of self-designed electronic warfare block library for simulation which consists of three sub-libraries, that is electromagnetic environment, receiver and signal processing. Firstly, we paid great attention to theories on digital channelized receiver based on multi-phase filter structure, parameter measurement method of time domain, frequency domain, and airspace domain, inner-pulse characteristics analysis, signal sort and identification. The receiver model is accomplished on the theory of multi-phase filter with the digital channelization and down sampling realized, which leads to a great reduction of sample rate and a release of stress on data throughput. In addition, its separating mixed signals in the frequency domain weakens the signals’ time domain intensity, leading to a high performance in anti-interference and acting as a good tradeoff between the interception probability and frequency resolution. Taking envelope detector output as input, checked by the adaptive detection threshold, the time domain parameters including TOA, PW and PA are captured indirectly from the pulse width preserved pulse and pulse amplitude preserved pulse. Phase difference method is adopted in instantaneous frequency measure, while two well-known orientation methods, four channels amplitude ratio and two dimensions bi-baseline interference, are introduced. Together with TOAs, PWs, PAs, RFs and DOAs, complete PDWs are reached so far. Instantaneous autocorrelation algorithm aiming at inner-pulse characteristics analysis, signal sort method are also cited. Further more, comparative analysis on histogram sort, CDIF, SDIF, PRI transform and its improved version is demonstrated in detail. With all above accomplished, the self-designed electronic warfare block library for simulation are built. And on top of that, a typical airborne ESM system at the signal level is achieved to verify the block library based on Simulink. |
