一种基于对消技术的瞬时大动态接收机

A Receiver with Instantaneous Large Dynamic Range Based on Cancellation Technique

针对侦察系统的电磁环境适应性受限于其动态范围的问题,提出了基于对消技术的瞬时大动态接收机,以此来提高侦察系统的动态范围。分析了影响侦察系统动态范围的因素,提出了在固定一中频将同源信号中的强信号分离,并在数字域进行自适应处理,在模拟域内进行功率抵消的接收机构架,同时分析了影响对消比的因素。通过仿真验证了该技术的可行性,并指出该技术路线尚需解决的问题。

The electromagnetic adaptability of reconnaissance system is restricted to its dynamic range. In view of this,a receiver with instantaneous large dynamic range based on cancellation technique is presented for improving the dynamic range of reconnaissance system. The factors affecting the dynamic range of recon-naissance system are analyzed, and a receiver framework based on cancellation technique is proposed in which the strong signal is separated from multi-signal in the fixed first intermediate frequency and adaptive processing is implemented in digital field and the strong signal is cancelled in analog field. The factors which affect the cancellation rate are also analyzed. The feasibility is validated through simulation and the difficulties to be solved are also indicated.