基于機(jī)動(dòng)平臺(tái)的延時(shí)多普勒測(cè)高技術(shù)研究
[Abstract]:Radar altimeter is one of the most important microwave remote sensors in aircraft. It has important applications in scientific research and economic life. With the progress of electronic jamming technology, radar signal detection under strong jamming has become a hot topic. In recent years, delayed Doppler altimetry has been successfully applied to various satellites. Experiments show that the proposed algorithm can not only improve the detection ability of radar under noise interference, but also improve the range resolution of radar altimeter. In this paper, the delayed Doppler altimetry algorithm is deeply studied by means of MATLAB simulation analysis, and a delayed Doppler algorithm based on large maneuvering platform is proposed. In this paper, the basic theory of pulse radar altimeter is briefly introduced, and the signal form suitable for delay Doppler technique is analyzed and simulated. The simulation results show that the linear frequency modulation signal is more suitable for delay Doppler algorithm. Based on the range migration correction of SAR imaging, the algorithm of spaceborne delay Doppler altimetry is simulated and analyzed, which lays a foundation for the delayed Doppler algorithm of maneuvering platform. This paper analyzes the difference between mobile platform and spaceborne platform and the influence of these differences on signal processing and detection algorithm. According to the changes of motion trajectory and observed objects, the distance needed to be compensated for delay in the new model is calculated, and the delayed Doppler algorithm based on uniform acceleration subduction incidence model is presented. The simulation results on MATLAB show that the pulse front of the echo rises faster, the peak energy of the echo is higher and the range resolution is better by using the delayed Doppler algorithm. Through Monte Carlo simulation and statistical analysis, it is found that delayed Doppler compensation can improve the detection ability of 8-9dB compared with that before compensation.
【學(xué)位授予單位】:中國(guó)工程物理研究院
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TN957.51
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