基于多天线的FRM数字信道化结构

Multi-Antenna-Based FRM Digital Channelization Structure

摘要:

针对传统单天线频率响应屏蔽（frequency response masking，FRM）数字信道化侦察接收机实时性不足，以及灵敏度与信道带宽之间相互制约的问题，提出了一种基于多天线的FRM数字信道化结构。将单天线FRM结构的信道化处理任务分配给多个天线，通过并行处理显著降低系统延时，并引入基于信号强度加权的Simple信号合成算法，通过多天线空间分集处理，在提升信道带宽的同时保证了接收机灵敏度，突破了单天线系统灵敏度与带宽的制约关系，实现了接收性能的显著提升。仿真结果表明，在总信道数为128的前提下，当输入信噪比优于-17 dB时，所提多天线结构在灵敏度与实时性方面性能相较于单天线结构均具有显著优势。

Abstract:

To address the issues of insufficient real-time performance in traditional single-antenna frequency response masking (FRM) digital channelized reconnaissance receivers, as well as the mutual constraint between sensitivity and channel bandwidth, a multi-antenna-based FRM digital channelization structure was proposed. This structure distributed the channelization processing tasks of the single-antenna FRM structure across multiple antennas, significantly reducing system latency through parallel processing. Additionally, a signal strength-weighted Simple signal synthesis algorithm was introduced, which employed multi-antenna spatial diversity processing to enhance channel bandwidth while ensuring receiver sensitivity. This approach overcame the trade-off between sensitivity and bandwidth inherent in single-antenna systems, achieving a significant improvement in reception performance. Simulation results demonstrate that, with a total of 128 channels and an input signal-to-noise ratio (SNR) better than -17 dB, the proposed multi-antenna structure exhibits substantial advantages over the single-antenna structure in sensitivity and real-time performance.