基于频谱校正与脉冲积累的实时高精度测频方法

Real-Time High-Precision Frequency Measurement Method Based on Spectrum Correction and Pulse Integration

针对相参雷达脉冲信号测频问题，提出了一种基于频谱校正与脉冲积累的实时高精度测频方法。该方法对每个脉冲采用离散频谱相位差校正法进行测频，并采取改进措施降低算法计算量，提高算法可靠性。然后，对多个单脉冲测频结果进行非相参积累，提高测频精度。同时，以脉冲重复频率（PRF）对信号进行抽取，并利用这些相参抽取点的测频结果对非相参积累的测频值进行精校正，最终可得到很高的测频精度。该测频方法计算量小，抗噪声能力较强，适合硬件实时实现，具有较高的工程应用价值。

A real-time high-precision frequency measurement method based on spectrum correction and pulse integration has been presented for coherent radar pulse signal. Phase difference correction method on discrete spectrum is employed to measure the frequency of each pulse, and improvement has been made to reduce the computation complexity and promote the reliability. Then, the mea- sured frequency of each pulse is non-coherently integrated to promote the precision. The pulse signal is also sub-sampled with the pulse repetition frequency （PRF） as sampling frequency. The frequen- cy measurement result from these sub-sampled points is used to finely correct the result of non-coher- ent integration. As a result, very high frequency measurement precision can be obtained. The pre- sented method shares the merits of low computation complexity and good ability of anti-noise. It is suitable for hardware implementation and is valuable for engineering application.