在雷达导引头中经常采用高ＰＲＦ倒置接收体制。在这种体制下，目标回波经倒置接收机的窄带滤波器后成为准连续波。因此，采用一种简单的中频采样方法，即可从单路中频信号的采样中获得正交双通道采样的效果。本文首先从原理上对中频采样的主要实现方法进行了综述，然后针对准连续波雷达导引头的特点，提出了一种简单的中频采样方法，其主要特点是以微小的系统误差为代价，大大简化了中频采样的硬件实现方法。最后介绍了客中方法的原理和电路实现的方案、误差来源，并通过实际系统测试证明了理论分析的正确性。

High PRF and inverse receiver are often used in radar missile guidance. In such kind of system, the echo wave passes the narrrowband filter of the receiver, and become quasi-continuous wave. So a simple method can be used to achieve quadrature sampling through single channel sampling. In this paper, after several IF sampling methods have been discussed theoretically, a new simple method applied to missile guidance is advanced. This method simplifies the IF sampling circuits greatly. The error analysis as well as the theory and circuit of this method is also given.

TN958.94 TJ765.331