摘要
针对低信噪比下相位差分法无法识别相位编码信号问题,提出了基于离散余变换(DCT)的相位编码信号识别方法。根据常规信号与相位编码信号的频谱差异,该方法采用平方运算对信号进行变换,利用离散余弦变换对平方后的信号频谱进行分析。在仿真条件相同的情况下,相比相位差分法,该方法识别率较高,抗噪性能也有所提高。同时,该方法具有运算量小和提取特征参量稳定的特点。
To solve the problem that phase difference method can＇t identify phase-coded signal in low SNR, An algorithm based on DCT is proposed to identify phase-coded signal. According to the difference of the spectrum between normal signal and phase-coded radar signal, this algorithm squares the signal, and then analyzes the spectrum of the signal via DCT. Compared with phase difference method under the same condition, this algorithm is more effective with high identification rate and anti-noise performance. In the meantime, it takes less runtime and characteristic parameters extracted are steady.
出处
《无线电工程》
2010年第9期15-18,共4页
Radio Engineering
