复幅度比对雷达目标分辨的影响

Influence of Relative Complex Amplitude on Radar Targets Resolutions

文中研究了双目标幅度比和相位差对雷达目标分辨[1-3]的影响问题。首先,给出了时域、多普勒域、角度域统一的雷达双目标回波模型;然后,给出了雷达目标分辨的数学定义,提出了复幅度比平面上可分辨区的概念来描述幅度比和相位差对雷达分辨的影响;最后,严格求出了给定目标间隔条件下可分辨区。研究表明:双目标间隔越小,可分辨区越小,分辨越困难;相位差越接近180°越容易分辨。上述结论适用于时域、多普勒域和空域。

The influence of relative phase and amplitude ratio on radar resolutions has been investigated theoretically. Firstly, the echo of two targets is established in time, Doppler and angle domains, uniformly. Then, the radar resolution is defined mathematically. A novel conception of resolvable area in complex plan is brought forth to describe the influence of relative phase and amplitude ratio on radar resolutions. Lastly, the resolvable area is derived theoretically at given target distance. It can be seen that resolvable area decreases with the target distance decreasing. Especially, the resolution is easy when the two targets are inverse phase. This conclusion fits in time, Doppler and space domains.