摘要
该文利用塔康测距信号收发已知且能量集中的特点,在原有的频谱相除方法的基础上,提出采用功率谱密度函数并引入补偿因子进行频谱相除的方法,对接收信号中多径时延进行估计。该方法首先利用功率谱密度函数与本地参考信号的频谱相除,并通过补偿因子使带外噪声的能量不会因相除而得到很大加强;再利用反傅里叶变换从接收信号中恢复有用信号的波形;最后利用恢复的波形对多径时延进行估计。计算机仿真验证了算法的有效性。
Based of known waveform,known period and concentrated energy of distance signal in TACAN system ,an efficient time delay estimation algorithm for multipath signal of distance signal is presented in this paper,according to the former frequency spectral division algorithm. Firstly,the crosspower spectrum function is divided by frequency spectrum of referenced signal,. And the energy of out-of-band noise is not enhanced via using compensation factor. Then,the useful signal is restored from receiving signal via IFFT. Finally,the delay is estimated from restored signal. Its effectiveness is verified with the simulation results.
出处
《电子与信息学报》
EI
CSCD
北大核心
2010年第9期2273-2276,共4页
Journal of Electronics & Information Technology
基金
陕西省自然科学研究项目(FJ08F06)资助课题
关键词
无线电导航
测距信号
塔康
多径时延
频谱相除
Radio navigation
Distance signal
TACAN
Multipath delay
Frequency spectral division
