| High-resolution radar is widely used in military applications. Chirp-subpulse stepped frequency signal (CSSF) is one of the high range resolution signals with merits of stepped-frequency signal and chirp signal. This dissertation studies the one dimensional imaging method of CSSF in millimeter radar guidance system.First, the basic expression of high-resolution one dimensional range profile of the stepped frequency (SF) is deduced to explain the high resolution of the wideband signals. Then, the characteristic of CSSF is analyzed, and the ambiguity function, the coupling of range and Doppler frequency and the sidelobe suppression are studied.Secondly, the basic process to obtain high resolution range profile of CSSF is introduced in this paper. The two-step process with Intra-pulse compression and Inter-pulse compression is further studied.Thirdly, the Doppler effect of CSSF is analyzed and simulated. A new method for motion compensation of combined fast approximate estimation based on Fast Fourier Transformation and accurate search estimation based on the least burst error rule is proposed. Profile aliasing and redundance in CSSF are discussed, and resolved by the method which combines target pick-up and parameters-selecting algorithms.At last, A-SD mono pulse radar is introduced. A method of angle measurement based on high resolution range profile is proposed. The process of obtaining azimuth and elevation of CSSF mono pulse radar with three channels (sum channel, azimuth difference channel, elevation difference channel) is given. |
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