根据雷达对海上舰船目标的抗干扰检测需求,雷达发射脉冲间往往采用跳频设计,这时目标回波相位会随慢时间非线性变化,传统的快速傅里叶变换处理不再适用于相参积累检测。文中分析了脉间跳频波形的相位变化,提出了针对此波形的两种相参积累检测新算法———变周期法和变因子离散傅里叶变换法,并给出了相参积累检测的详细计算过程。仿真实验证明:新算法可以使跳频脉冲波形的检测性能与同频脉冲的相参积累检测性能相当。

According to the requirement of radar anti-jamming detection for sea ship target, the design of frequency hopping is usually applied to radar transmitting pulses, which makes target echo phase vary nonlinearly in slow-time. So the conventional fast Fourier transform approach can′t be used to realize coherent integration in this situation. Accordingly, the phase variation of pulse frequency hopping waveform is analyzed, and two new algorithms for inter-pulse frequency hopping waveform coherent integration, specifically the pulse repetition interval-changed approach and factor-changed discrete Fourier transform approach, are proposed. Then the processing details for the coherent integration are demonstrated. The simulation experiment further testifies that both algorithms for processing inter-pulse frequency hopping waveform can obtain the same performance as that for co-frequency pulse waveform.

TN957.51