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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 d B;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。
Aiming at the application background of weak target detection in land-based radar receiver adopting pulsed Doppler (PD) system under strong overlapping clutter, the principle of PD processing is firstly introduced. Then, the influence of clutter overlap on receiving echoes Finally, the effective measures to improve the detection ability of weak moving targets in the near-field strong clutter of land-based PD radar are given through the engineering examples: 1) The design of the frequency source does not suggest the phase-locked source system and the phase noise is concerned The range is extended to MHz. 2) The instantaneous spurious-free dynamic range index needs to be increased to 75 dB. 3) The system receive gain should be minimized to ensure the system noise figure is limited.