射电天文研究组知识库

太阳射电爆发是一种潜在的导航系统干扰因素。通过导航信号模型推导，分析了其干扰导航信号的机理，提出太阳射电爆发干扰导航通信的影响方程与太阳射电爆发流量、接收机性能以及太阳–天线高度角有关，其中太阳射电流量总功率与信号的信噪比下降呈正相关；同时受到太阳–天线高度角和有效面积的制约，又与接收机环路滤波器响应函数呈卷积关系。通过对2003年10月28日、2006年12月6日和2015年11月4日事件中GPS失锁情况分析，发现同一次事件中同一站点不同接收机的失锁率不同；同一次事件中不同纬度的接收机失锁率不同，以及在同一次事件中L波段（1～2 GHz）太阳射电爆发频谱不均匀的条件下，L1和L2频段信号的信噪比下降情况也不同。从上述三个事件的观测表征验证了上述影响方程的分析正确性。 

Solar radio bursts are a potential interference factor in navigation systems. From the navigation signal model is derived in this paper, the paper analyzes the solar radio burst interference mechanism of navigation signal, the interference effects exist three effects, namely with the solar radio burst flux, receiver performance, and the Angle of the Sun-navigation antenna height, synthesize the proposed the influence of solar radio burst interfere with communication navigation equation. It is concluded that the total integrated power of the solar burst flow in the navigation communication frequency band is positively correlated with the decrease of the signal to noise ratio of the communication signal, and is affected by the modulation of the height Angle of the sun-antenna and the effective area of the antenna, and has a convolution relationship with the response function of the loop filter of the navigation receiver. Then, this paper further analyzed the GPS lock-out signal during the solar radio bursts on 28 October 2003, 6 December 2006 and 4 November 2015. It is found that the loss-rate of different receivers at the same site is different in the same event (receiver performances effect). The loss-of-lock rate of the same receiver at different latitudes in the same event is different (Sun-antenna height Angle effect). In addition, under the condition of non-uniform spectrum of L-band (1～2 GHz) solar radio bursts in the same event (solar radio burst flow distribution effect), the decrease of signal to noise ratio of L1 and L2 band communication signals is also different. Therefore, the analytical correctness of the above influence equation is verified by the observation characterization of the above three events.