陆基雷达接收机采用PD体制的设计需求研究

针对采用脉冲多普勒(PD)体制的陆基雷达接收机在强重叠杂波条件下进行弱目标检测的应用背景,首先介绍了PD处理的原理;然后,重点分析了杂波重叠对接收回波模型的影响;最后,通过工程实例分析给出了提高陆基PD雷达近距离强杂波背景下弱动目标检测能力的有效措施:1)频率源的设计不建议锁相源体制,相位噪声关注范围扩展到MHz量级;2)瞬时无杂散动态范围指标需提高到75 dB;3)保证系统噪声系数恶化有限的前提下,尽量降低系统接收增益。

A Study on the Design Requirement of Ground-based Radar Receiver Using Pulse Doppler System

According to the ground-based radar receiver using pulse Doppler(PD) system under the condition of weak target detection in strong clutter, this paper firstly introduces the principle of PD processing. Then the influence of strong clutter overlapping to the receiving clutter is analyzed. Lastly some effective measures for weak target detection in strong clutter of ground-based radar receiver using PD system are given, including: 1) the design system of the frequency source is not recommended for the phase locking system, and the phase noise of frequency source should follow up to MHz order; 2) the spurious free dynamic range should improve to 75 dB; 3) under the premise of limited system noise coefficient deterioration, the receiving gain should be reduced.