基于多相滤波器的高分辨率信道化接收机设计

针对无盲区的多相数字信道化接收机,综合考虑了原型滤波器的瞬态响应时间和系统后续处理速度,推导出选择滤波器过渡带宽的数学公式,为信道化接收机的滤波器合理设计提供了评判标准。针对信道化接收机的频率分辨率受信道带宽限制的缺点,在系统后续处理中提出了重叠的离散傅里叶变换算法,减小计算量的同时提高了系统的实时性。能够灵活设置单组DFT运算点数,提高了接收机频率测量的精度。最后,通过仿真分析验证了该高效设计的可行性。

Design of Channelized Receiver with High Frequency Resolution Based on Polyphase Structure

Aiming at digital polyphase-structures channelized receiver with no blind zone, it is the first time that both the speed of system processing and the transient response time of filter are concerned, and mathematical formula is obtained to choose the best choice of the transitional bandwidth, which provides a reasonable standard used in designing the filter of digital channelized receiver. On the other side, frequency resolution is limited at the bandwidth of each channel, overlapping DFT algorithm is proponed to make up this disadvantage, the amount of calculation is reduced and the timeliness of system is improved at the same time. The