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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。
In the radar seeker often adopts high PRF inversion receiving system. Under this system, the target echoes become quasi-continuous waves after inverting the receiver’s narrow-band filter. Therefore, a simple IF sampling method is used to obtain the effect of quadrature dual-channel sampling from a single IF signal. This paper first summarizes the main methods of IF sampling in principle, and then proposes a simple IF sampling method based on the characteristics of quasi-CW radar seeker. The main features of this method are the cost of tiny systematic errors, Greatly simplifies the IF sampling hardware implementation. At last, the principle of the method in the guest and the scheme of the circuit implementation are introduced, the sources of the error are introduced, and the correctness of the theoretical analysis is proved through the actual system test.