基于互模糊函数的快速时差频差联合估计  

Joint TDOA-FDOA Fast Estimation Algorithm Based on Cross-ambiguity Function

作　　者：王奉帅[1] 刘聪锋[1] 张亚 甘昶[1] 

机构地区：[1]西安电子科技大学,电子对抗研究所,西安710071 [2]解放军73677部队,南京210016

出　　处：《中国电子科学研究院学报》2011年第6期603-607,共5页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学基金(61072107);博士后基金(20090451251);陕西省工业攻关(2009K08-31);中央高校基本科研业务费专项资金资助(JY10000902025)

摘　　要：针对无源定位中的时差频差联合估计问题,利用内积公式推导出了基于互模糊函数的时差频差联合估计公式,并提出了相应的快速实现算法。其中通过适当变换互模糊函数计算公式,将传统的二维时差频差搜索算法变为对信号内积进行快速傅里叶变换,然后对变换后的数据进行二维搜索,大大提高了时差频差联合估计的速度,降低了运算量。通过重构离散傅里叶变换项,并进行近似,进一步降低了运算量。仿真结果说明,两种算法都能得出准确的结果,改进的算法计算时间更少。Deduce the cross ambiguity function using inner product. For the signal transmitted from the target is received by two different receivers, use cross ambiguity function to figure out the TDOA and FDOA between the two received signals. Transformed suitably, the cross ambiguity function formula can be counted as making a FFT to the inner production of the two signals, then find the max from the transformed data in two-dimensional search, which reduces calculation largely. Furthermore, simplify the Fourier transform term reduces calculation largely, meanwhile saves calculation time.

关 键 词：互模糊函数 时差频差联合估计 快速计算 

分 类 号：TN957[电子电信—信号与信息处理]