邻信道合并的改进及其测频方法

为了确保高灵敏度,数字信道化接收机的子信道带宽一般较窄。然而,在现代电子战环境中,存在大量的宽带雷达信号,其带宽经常会大于信道宽度,使得多信道都存在信号,将增加信道编码及脉内处理的复杂度。提出了一种邻信道合并方法,直接对信道化的原型低通滤波器进行了解析设计,便于采用带宽相加实现输出子信道的带宽扩展。首先给出了原型低通滤波器的一种解析解;然后,采用相似系数,从仿真角度证明了邻信道合并对宽带信号的适用性;最后,根据信道分布特点,设计了一种窄带测频方法。理论分析和仿真结果证实了方法的有效性。

Improvement of adjacent channel merging channelized receiver and its frequency estimation

The sub-band of a channelized receiver is usually narrow to get a high sensitivity. However, there are lots of wideband radar signals with bands wider than the sub-band in modern electronic warfare envi- ronments, which makes channel coder and intra-pulse analysis unit more complex because of the signals in many channels. A new way is proposed to improve the performance of adjacent channel merging （ACM） chan- nelized receiver, and get an analytical expression for the low-pass filter to expand the wideband of the added sub-bands. Firstly, the analytical expression for the low-pass filter is derived. Then, the similarity is adopted to prove the validity of the ACM channelization. At last, a frequency estimation algorithm is designed according to the property of channel distribution. Theory analysis and simulations show the validity of the proposed approach.