噪声雷达通过发射随机信号探测目标信息,具备低截获概率与良好的电子对抗性能,但随机信号引入的高距离旁瓣会严重影响系统动态范围。通常采用大时宽带宽积信号来降低噪声雷达的旁瓣水平,但会引起采样率和数据量的增加。单比特量化能够降低高速采样器件的难度,同时降低数据存储设备负担。文中设计并构建了单比特噪声雷达实验系统,介绍了系统方案与信号处理方法,开展了实际点目标的距离成像实验,并基于真实实验数据分析了时间宽度对距离旁瓣水平的影响。实验结果表明:对于大时宽带宽积的噪声雷达,通过采用单比特技术能够在保持动态范围不变的同时大幅降低数据量。

Noise radar uses random waveforms to detect target, which has low probability of intercept and good electronic countermeasure capabilities, but the high range sidelobe caused by random signals will reduce the dynamic range of the system. By transmitting signals with large time-bandwidth product, the sidelobe level of noise radar can be reduced at the expense of increasing sampling rate and data amount. One-bit quantization can ease the difficulties of high-speed sampling and reduce the data size. An experimental one-bit noise radar along with system design and signal processing method are presented. Experiments of range imaging on point targets are conducted, and the relationship between time duration and range sidelobe level are analyzed based on real data. Experimental results show that for random signals with large time-bandwidth product, one-bit quantization can greatly reduce the data size without reducing the dynamic range of range profile.

TN957

国家自然科学基金资助项目