Tbd Method Based On The Accumulation Of Non-fluctuating Target Coherent

In the recent few years, the RCS magnitude of radar has decreased for one to two times through the stealth measures. All these treatments make them difficult to be found. Facing the threat of weak targets, the track-before-detect skill has a good effect. However, the existing TBD methods use non-coherent integration among multi-frame echoes and they have low effect in detection. So it need more date to get wonderful result and this causing the complexity computation.According to the above problem, in this paper we make a study of TBD using coherent integration. In the studying, we analysis the model of echoes and indicate the problems of coherent integration then we gave a research of coherent TBD method. For the features of weak targets, this technology enhances the target SNR by coherent integrating of multi-frame echo. This process can further improve the detection probability of enemy targets with less data.The main contents are as follows:a) Researched the feasibility of coherent TBD method and its difficulties. First, We gave the coherent mathematical model and analyzed the coherent TBD method, indicated that the method is practicable. Then the difficulty of the idea was analyzed. It pointed out that the less target echo, target migration and complexity computation were the problems that the method needing to solve.b) Proposed three methods of TBD basing coherent integration. For the problems of coherent TBD, after connected multi-frame echoes, selected the azimuth, zeroed the noise and compensated migration, the method realized coherent integration by FFT. In this paper three coherent TBD methods were proposed according the difference of compensation method: coherent integration TBD method basing velocity estimating; coherent integration TBD method basing radon transforming and coherent integration TBD method basing keystone transforming. And the thesis discussed the processes and principles of these methods in detailed. At last, thesis tested and verified that these new methods through simulation and compared the performance of these three methods through simulation experiment at first, and pointed out that the coherent integration TBD method basing keystone transforming is the best..c) Researched the instantaneity of coherent TBD. For the problem of complexity computation, thesis analyzed the system parameters design. Under these parameters we gave a parallel processing program which reduced the running time of coherent TBD method.