基于改进的小波-矩阵法实现雷电干扰抑制

Lightning Interference Suppression Based on Improved Wavelet-Matrix Combined Algorithm

高频地波雷达探测飞行目标时,由于所处高频段电磁环境复杂,以冲击干扰为主要形式的雷电干扰会严重影响雷达探测性能。现有的小波-矩阵联合抑制法与传统方法相比,具有定位精度高、算法复杂度低的优点,但是却具有适用范围单一的局限性。以联合法的适用条件为依据将雷电干扰分类,研究不同类型雷电干扰的最佳抑制方法,并提出了改进的小波-矩阵联合法抑制雷电干扰方案。试验仿真表明,此改进方案能很好地抑制多种类型的雷电干扰,最大程度地降低了多普勒域噪声基底,有效地提高了高频雷达抗雷电干扰性能。

HF surface wave radar（HFSWR） works in high frequency band, which is an extremely complex electromagnetic environment. Lightning interference, as the main form of transient interference, may badly affect the detection performance of HFSWR, when detecting flying targets. Compared with traditional anti-interference methods, the previous wavelet-matrix combined method has the advantages of high positioning accuracy and low complexity of algorithm, but it is limited by its single application. Based on the applicable conditions of combined method, lightning interference is classified and suppressed separately, and an improved wavelet-matrix combined algorithm is proposed in this paper. The simulation results show that it can suppress various lightning interferences, minimize the noise floor of the Doppler domain, and improve HF radar＇s resistance of lightning interference effectively.