在雷达和通信共用的超高频(UHF)、L、S波段,时频交叠的复杂电磁环境给雷达侦察系统的侦收、分选及识别带来了困难。尤其是当电磁环境中出现了多种调制形式的大时宽、大带宽、低功率、类噪声的低截获概率信号,这些信号可能来自于低截获概率雷达,也可能是使用同样频段的通信信号。针对时频交叠的电磁环境客观现状,文中分析了电磁环境的发展趋势,并对多信号时频交叠概率进行定量分析,得出雷达侦察系统需要进行针对性改进的结论,最后结合国外最近的技术发展,对改进雷达侦察系统应对时频交叠电磁环境进行了初步探讨。

In the ultra-high frequency (UHF), L and S bands shared by radar and communication, the complex electromagnetic environment with overlapping time-frequency brings difficulties to the detection, sorting and identification of radar reconnaissance system. Specifically, when there are a variety of modulation forms of large time width, large bandwidth, low power and noise like low intercept probability (LPI) signals in the electromagnetic environment. These signals could come from LPI radar or communication systems using the same frequency band. Aiming at the objective situation of time-frequency overlapping electromagnetic environment, its development trend is analyzed, the overlap probability of multiple signals is analyzed quantitatively. It is concluded that radar reconnaissance system needs to be improved. Finally, combining the latest technology development abroad, preliminary study on the improvement direction of radar reconnaissance system is given.

TN971

国家重点研发计划课题