相位编码信号的综合旁瓣能量改善技术

The integrated sidelobe level improved technology for phase coded waveform

相位编码信号的综合旁瓣性能不佳是制约其在分布式目标观测应用中的主要因素。根据相位编码信号的均匀旁瓣结构有利于抑制旁瓣能量的性质,采用失配滤波技术对接收回波处理,获得了基本均匀的旁瓣输出,进一步通过接收回波提取出原始发射信号分量,通过一位时移、取复共轭形成了旁瓣对消器,经过旁瓣对消处理后极大地改善了相位编码信号的积分旁瓣比指标值,并且获得了类似线性调频信号的多普勒容忍性,本方法将使得相位编码信号在雷达对地观测等方面获得很好的应用前景。

The unsatisfactory integrated sidelobe energy performance limits the phase coded signal applied in the observation of extended targets.Based on the phase coded waveform with uniform sidelobe to reduce sidelobe energy,the mismatched filter technology is utilized to process echo for producing nearly uniform sidelobe.Moreover,the original transmitted signal components is extracted from the echo without any interference,the sidelobe canceller is constructed with the conjugate signal of itself but shifted by one bit.As a result of the sidelobe cancel and other preprocessing,the phase coded signal integrated sidelobe level ratio is improved remarkably,and also obtained advanced Doppler tolerance that similar to linear frequency modulated signal.The proposed method may make the phase coded waveform obtain widely radar apply such as observation space-to-ground.