射电天文研究组知识库

L波段太阳射电爆发是导航系统不稳定性的潜在影响因素,通过L波段内精密太阳射电流量的监测可以有效判断其对导航信号的影响程度,为此云南天文台本部拟建立一个L波段多频点太阳射电监测系统.而对无线电环境的有效评估对于该监测系统观测数据的稳定获取至关重要.本文介绍了该监测平台的无线电监测准备研究,通过对云南天文台本部凤凰山地区的L波段东、西、南、北4向无线电环境进行了超过100小时的监测,每个方向各4次,共16次的监测.本文提出一种基于SimpleThresholding算法与CUSUM算法的改进阈值算法对阈值的确定,遴选出5MHz无线电干扰较少的无线电通带1161MHz～1165MHz以及5MHz无线电干扰较多的无线电通带1275MHzz～1279MHz的洁净率进行对比,其洁净率分别为97%和88%.结果表明该阈值确定的方法可用于对遴选信道的评估且能判断否符合太阳观测需求,为下一步接收机的设计和信号处理提供了依据.

L-band solar radio burst is a potential factor affecting the instablility of navigation system, and its influence on navigation signal can be effectively determined by monitoring the precise solar radio flow in L-band. Therefore, Yunnan Observatory headquarters plans to establish an L-band multi-frequency point solar radio monitoring system. The effective evaluation of the radio environment is essential for the stable acquisition of observational data of the monitoring system. This article introduces the radio monitoring preparation research of the monitoring platform, through the L-band east, west, south and north radio environment in the Fenghuangshan area of the Headquarters of yunnan astronomical observatory for more than 100 hours, 4 times in each direction, a total of 16 times of monitoring. In this paper, an improved threshold algorithm based on Simple Thresholding algorithm and CUSUM algorithm is proposed to determine the threshold, the 5MHz radio transmission band with less radio interference 1161MHz~1165 MHz was selected The cleanliness rates of 1275MHz-1279MHz in the radiocommband with more 5MHz radio interference are compared, and the cleanliness rates are 97% and 88%, respectively. The results show that the threshold determination method can be used to evaluate the selection channel and judge whether it meets the requirements of solar observation, which provides a basis for the design of receiver and signal processing in the next step.