辅助通道参数模型估计射电天文抗干扰方法

针对单通道射电天文抗干扰方法在观测数据干噪比较低情况下的干扰消除性能降低甚至失效的问题,通过引入辅助天线观测提出了一种基于参数模型估计的抗干扰方法。该方法利用辅助天线所接收到的具有较高干噪比的观测数据建立干扰信号参数的估计模型,同时通过构建主辅通道参数差异性模型对估计模型进行修正,实现对干扰信号参数的精确估计,达到消除干扰信号的目的。仿真实验表明,相比于单通道方法,改进后的方法在解决低干噪比条件下的射电天文抗干扰问题方面具有更广泛的适用范围。

Auxiliary channel-assisted interference mitigation method for radio astronomy by parametric estimation and subtraction

Satellite navigation systems take up L-band about 150M between 1.1GHz and 1.6GHz bandwidth, which severely limits the observing range and efficiency of radio astronomical observations in this band. The single channel method of anti-navigation frequency interference mainly utilizes the prior knowledge of the interference in observed data received by the large antenna for interference mitigation, the performance of the interference mitigation is weakened in the case of the relatively lower interference-to-noise ratio in the observed data. This paper proposes an auxiliary channel-assisted interference mitigation method for radio astronomy by parametric estimation and subtraction. To achieve the purpose of eliminating the interference signal, the proposed method utilizes the observational data received by auxiliary antenna having a higher interference-to-noise ratio to establish the estimation model of interference parameters, at the same time by constructing the difference parameters estimation model of the main and auxiliary channel to correct the estimation model. Simulation results indicate that, compared with the single channel method, the proposed method is more broadly applicable to eliminate the interference in the lower interference-to-noise ratio conditions for radio astronomy.