【摘要】 介绍了频率步进雷达信号实现距离高分辨的工作原理。针对采用步进频信号的某W频段末制导雷达在系统调试过程中,由于频率源本振和激励源不同频点的相位差不同造成距离像畸变的情况,分析了信号相位变化对高分辨距离像的影响,根据步进频信号距离高分辨的原理,提出一种对各频点间相位差进行相位补偿的方法。计算机仿真结果表明其可行性,并在试验中对该方法进行了验证。通过该方法可以不用对步进频信号各频点的相参性过高要求,即可得到高分辨距离像,达到理想的距离分辨率,有效降低了W频段频率源设计和调试的难度。更多还原

【Abstract】 The theory of using the stepped frequency radar signal to acquire high range resolution is introduced in this paper.Considering the aberrance of range profile in the W-band stepped frequency radar system test,which is caused by the phase variation between local oscillator and excitation source at different frequency points,the effect of phase variance on high resolution range profile is analysed,and a phase compensation method at each frequency point is proposed based upon the principle of high resolution range profile using stepped frequency.The feasibility of this method is proved by Matlab simulation with real data acquired,and verified in the following radar test.Moreover,this method requires no high coherence among various frequencies to obtain high resolution range profile,so it can effectively reduce the difficulty in W-band frequency synthesizer design and tunning.更多还原