基于联合检测与估计的闭环系统设计及应用

Design and application of closed-loop system based on joint detection and estimation

提出先验概率更新规则,改进已有的基于联合检测与估计的闭环技术,根据估计器信息同步更新先验概率和先验分布,将先验信息反馈给检测器以辅助其作出判决,从而形成检测与估计的闭环结构.将本方法应用于窄带信号检测与波达方向(DOA)估计.通过理论推导与数值分析发现新的闭环系统收敛速度更快、最大后验概率(MAP)准则下判决可信度更高,且在起始先验概率不利的情况下,闭环系统具备判决纠错能力.

A prior probability update rule was proposed to further optimize the feedback-aided mechanism and the design of closed-loop system,aiming at improving the existing closed-loop technology based on joint detection and estimation.The method synchronously updated the prior probability and the prior distribution referring to the estimator,and the detector made decision with the help of the prior information feedback,forming a closed-loop structure for detector and estimator.New method was developed in the context of narrowband signal detection and direction of arrival(DOA)estimation.By means of theoretical derivation and numerical analysis,it is found that new system makes convergence rate faster and more reliable decision is made considering maximum a posteriori(MAP)criterion.More importantly,it is capable to correct wrong decision even original state is critical due to the prior probability.