摘要
提出一种基于倒谱域相关的时差/频差联合估计算法,同时估计双传感器平台接收到的2路信号中的时延分量和频偏分量。与传统的基于二(四)阶相关复模糊函数法相比,新算法借鉴时域卷积等价于频域乘积的思想,将频域卷积等价于倒谱域相关,将时差频差二维搜索问题转化为先频差、后时差的2个一维搜索问题,由此实现时差/频差的快速联合估计。
A New algorithm for joint estimation of TDOA/FDOA has been proposed based on cepstrum field correlation in this paper. Meanwhile estimation of time delay and frequency shift between two signals received by two sensors platform are performed. Compared with traditional CAF methods based on second order （or fourth order） correlation, the new algorithm uses time domain convolution＇s equivalence to frequency domain production for reference, which makes frequency domain convolution equivalent to cepstrum domain correlation and converts TDOA/FDOA 2-dimension search problem into two 1-dimension search problems of FDOA first and then TDOA.Thus the fast joint estimation for TDOA/FDOA can be implemented.
出处
《无线电工程》
2007年第11期26-27,58,共3页
Radio Engineering
关键词
倒谱域相关
复模糊函数
时差
频差
cepstrum field correlation
complex ambiguity function
time difference of arrival
frequency difference of arrival
