GPS卫星信标信噪比的统计分析  

A Statistical Study on Signal to Noise Ratio of GPS Beacon

作　　者：熊波[1] 万卫星[1] 

机构地区：[1]中国科学院地质与地球物理研究所

出　　处：《空间科学学报》2006年第5期326-330,共5页Chinese Journal of Space Science

基　　金：中国科学院方向性项目资助(KZCX3-SW-144)

摘　　要：GPS卫星信标信噪比(SNR)受到卫星上的发射机增益、地面站的接收机增益、卫星与接收机之间的几何距离、接收机处的仰角、信标传播路径上电离层介质衰减等因素的共同影响．首先提出了一种从SNR观测数据中分离出SNR在电离层中衰减的算法,并应用于MANA接收站(273．751°E,12．149°N)2003年的观测数据,得到了一个电离层介质引起的对L波段信标SNR衰减日变化的平均情况．通过与IRI模式计算的电波垂直穿过电离层时衰减的SNR比较发现,由我们得到的SNR在电波垂直穿过电离层时的衰减与IRI模式计算的衰减随地方时的变化符合得比较好．The Signal to Noise Ratio （SNR） of GPS satellites beacon is mainly influenced by the gain of GPS satellites transmitter and receives on the ground, the geometrical distance between GPS satellites and receives, the elevation of the receives and the ionosphere medium attenuation. In this paper, a method is proposed to separate ionospheric attenuation from the observation of SNR. The technique was used to analyze the data observed at MANA station （273.751°E, 12.149°N） in 2003, and to construct a mean diurnal change pattern of the ionosphere medium attenuation. Comparing with the attenuation value calculated using IRI. It shows that the result fits with IRI well in the change of the attenuation value of SNR with the local time, when GPS signal radio vertically penetrates through the ionosphere.

关 键 词：GPS SNR 信标 电离层衰减 

分 类 号：P228.4[天文地球—大地测量学与测量工程]