摘要
雷达侦察接收机需要超宽带接收能力以获取高截获概率。受硬件限制,当前基于采样定理的常规接收结构难以进行瞬时超宽带接收。基于中国余数定理的欠采样理论为超宽带侦收提供了一种可行思路,但传统余数定理估计算法要求模值之间互素,信号采样点数也需为模值的最大公约数。为突破上述约束,构造模糊解库并利用余数与频率的一一映射关系,提出基于模糊解库-中国余数定理的雷达信号精确载频估计算法。所提算法不需要同余方程组求解,放宽了对采样频率和采样点数的要求。通过仿真实验,验证算法的有效性。研究结果表明,较传统余数定理算法,所提算法在估计不同雷达信号载频时,无需修改模值,有利于工程应用,同时具有较好的估计精度和抗噪性能。
Radar reconnaissance receiver is required to have ultra-wideband receiving ability to obtain the high probability of interception.Because of the hardware limitations,the conventional receiver based on the Nyquist sampling theorem is difficult to achieve instantaneous ultra-wideband receiving.The under-sampling theory based on the Chinese remainder theorem(CRT)provides a feasible approach for ultra-wideband receiving.However,the traditional frequency estimation method for CRT requires a coprime among the modulus values,and the number of sampled points must be the greatest common divisor of the modulus.To overcome these limitations,a fuzzy solution library is constructed.A precise carrier frequency estimation method of radar signal is proposed based on the fuzzy solution library and CRT,which uses the one-to-one mapping relationship between remainder and signal frequency.The proposed method has no need to solve the congruence equation system,and relaxes the requirements for the sampling frequency and the number of sampling points.Finally,the effectiveness of the proposed method is verified through simulation experiments.Compared with the traditional CRT algorithms,the proposed method has no necessity to change the modulus when estimating the carrier frequencies of different radar signals,which is more convenient for engineering applications.Meanwhile,the proposed method provides good estimation accuracy and noise resistance.
作者
李博文
仇兆炀
刘怡飞
曹彬
孙闽红
LI Bowen;QIU Zhaoyang;LIU Yifei;CAO Bin;SUN Minhong(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310000,Zhejiang,China;Shenzhen Goodix Technology Co.,Ltd.,Chengdu 610000,Sichuan,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2024年第8期2784-2792,共9页
Acta Armamentarii
基金
国家自然科学基金项目(61901149)。
关键词
超宽带接收
中国余数定理
模糊解库
频率估计
ultra-wideband receiving
Chinese remainder theorem
fuzzy solution library
frequency estimation
