摘要
非相干散射雷达的回波极其微弱,通常在交替码码片内采用Barker码进行脉冲压缩。邻近空间区域的回波信号形成杂波噪声,Barker码解码后出现在旁瓣中。为了抑制旁瓣,提出用互补码代替Barker码,然后调制到同时发射的工作频率不同的两个谐波上。与Barker码相比,互补码能够较好地去掉旁瓣,解码后的信号具有较高的信噪比。
The incoherent scattering radar echo is so weak that the Barker code is often used as a means of pulse compression in alternating code bit. However, clutters are generated from all simultaneously illuminated space nearby, and emerge in sidelobes decoded by Barker code. In order to remove the sidelobes, complementary code was adopted in place of Barker code. Then two harmonic waves transmitted at the same time with different operating frequency were modulated by the complementary code. Compared with Barker code, the complementary code could well get rid of the sidelobes, and the higher SNR （Signal to noise ratio） of decoded signals was got.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2009年第19期6148-6151,共4页
Journal of System Simulation
基金
国家自然科学基金重大国际合作项目(40310223)
国家重大科学工程"子午工程"
关键词
非相干散射
互补码
交替码码片
杂波噪声
旁瓣
incoherent scattering
complementary code
alternating code bit
clutter noise
sidelobe
