# Establishment of Regional Ionospheric Delay Model and Comparative Analysis of Its Accuracy

Digital Communication World - - Contents -

Li Huasheng1, Zhan Dahui1, Shu Bao2

(1. The State Radio_monitoring_center Testing Center, Beijing, 100041;

2. Wuhan University, Wuhan, 430079)

Abstract: In this paper, the model of ionospheric delay correction in China is constructed by using the trigonometric series model and the polynomial model.after testing the model with the Klobuchar model and the single point location program, the results show that the correction effect of the two models to the single-frequency GPS users in the region is significantly better than that of the Klobucar model.the polynomial model of the time interval in the ionospheric active region is better than that of the whole day trigonometric series model.the analysis of DCB results also shows that the established model of ionospheric layer is reliable..

Keywords: Regional ionospheric modeling; hardware delay; smooth pseudo-distance single point positioning

1 引言

GPS测量精度的影响。

2 VTEC模型建立的原理

（ 1 ） ρ = P − 40.28 f TEC + B 2 S − B 2 R 2 22将f1和f2的具体数值代入后可得伪距观测值TEC = 9.52437 ( P − P )+ BS − BR （2） 2 1式中，TEC以1016个电子/M3，为单位；P1、P2以M为单位；BS、BR分别为卫星和接受机的硬件延迟，可通过参数估计计算。然后用下式求得穿刺点上的VTEC值：

VTEC = TEC • cos Z （3）

VTEC多项式模型POLY （ Ploynominal Model）是目前广泛应用的局部电离层模型，但一

= − ϕ − （4）

ik 0

i=0 k =0式中，φ0为测区中心点的地理纬度；s0为测区中心点(φ 0，λ 0)在该时段中央时刻t0时的太阳时角

S-S0=(Λ -λ 0)-(t-t0)；λ为信号路径与单层的交点p'的

（5） 式中， BS是卫星穿刺点的足下点纬度与展开点

0.064 cos −1.617) （6）

（7）式中，T代表一天的24小时；t是观测时刻穿刺

4 实例分析