阐述了超视距雷达用中频采样和数字下变频的原理 ,给出了具体的工程实现方法。该设计可实现I/Q基带信号以 2 4位串行输出 ,可完成五种带宽的数字低通滤波器的切换 ,并可对多路接收机之间出现的相位误差进行补偿 ,对其测试后的性能指标完全能满足雷达的实际要求

The theory of the device with direct intermediate frequency sampling and digital down convert for OTH radar is described by this paper, and the implementation method is also introduced . The design can output I/Q baseband signal with 24 bits in serial data, it can switch among five type of digital LPF, and it also can compensate phase difference in multi receivers. The tested result well meet the needs in radar system.

TN958.93 TN957.5