[关键词]
[摘要]
P 波段合成孔径雷达因其穿透性强而受到广泛关注,但是因其频段低而带宽宽,使得接收机的设计面临诸多挑战。文中介绍了一种工作中心频率为330 MHz 、相对带宽达60£¥ 、动态范围达80 dB 的合成孔径雷达接收机的设计过程。提出了P 波段超宽带雷达接收机的设计方案;同时,对噪声系数、增益、动态范围等关键指标进行了详细的分析和计算。解决了大动态范围增益控制、宽带幅频平坦特性、带外抑制度等技术难题。设计完成的接收机各项指标均达到或优于系统要求,并成功应用于雷达系统中。
[Key word]
[Abstract]
P-band synthetic aperture radar is widely concerned because of its strong penetrability, but as its operating frequency is very low and its signal bandwidth is very wide, the design of its receiver is facing many challenges. The design process of a SAR receiver whose center frequency is 330 MHz, relative bandwidth up to 60% and dynamic range up to 80 dB is introduced. The design scheme of the receiver is proposed. The most important technological indexes like noise figure, gain and dynamic range are analyzed and calculated in detail. Difficult technological problems like large dynamic range gain control, wide band magnitude-frequency flatness characteristics and out-of-band rejection are successfully solved. The completed receiver is successfully applied to the radar system with every technological indexes equal or better than the system requirements.
[中图分类号]
TN957
[基金项目]