Effect of Radio Frequency Interference (RFI) on the Precision of GPS Relative Positioning

8th International Symposium of the Digital Earth

地球科学;计算机科学

Idris, A.N.^1 ; Sathyamoorthy, D.^2 ; Suldi, A.M.^1 ; Hamid, J.R.A.^1

Centre for Geospatial Technology (CGT), Faculty of Architecture, Planning and Surveying, Universiti Teknologi MARA, Selangor, 40450 Shah Alam, Malaysia^1

Science and Technology Research Institute for Defence (STRIDE), Kompleks Induk STRIDE, Taman Bukit Mewah Fasa 9, Selangor, 43000 Kajang, Malaysia^2

关键词: Dual frequency receivers;    Geometric dilution of precision;    Interference signal;    Interference sources;    Radio frequency interference;    Real environments;    Relative positioning;    Satellite vehicles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/18/1/012035/pdf
DOI  :  10.1088/1755-1315/18/1/012035

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The successful of GPS observations are dependent on several factors between satellite vehicles and GPS receivers, where low GPS power levels have led to the threat of radio frequency interference (RFI) on the GPS signals. This study was conducted to evaluate the effect of RFI on the precision of positions of single and dual frequency receivers through relative positioning technique by taking into consideration the radius of GPS receiver from interference source, length of baseline and response of rejection. Several tests were conducted in real environment by simulating the interference signal towards GPS receivers in the nominated GPS L1 and L2 bands. Calculations were made to indentify the distance and interference signal power between interference source and GPS receiver in order to investigate the level of effect. To be able to study this effect on the precision of GPS positions, the 3D residual positions and geometric dilution of precision (GDOP) have been used. The findings of this study have demonstrated that a sufficient time for the GPS receiver to respond in particular interference signal power level and the radius from the interference source were made as compared to previous work. It was also indicated that the residual positions and GDOPs were affected proportionally when nearly to interference source but not similar for both days due to GPS coverage and other probable errors. Therefore, a good investigation on RFI towards GPS signals should be conducted in secured environment which can control the various GPS error parameters in order to obtain a reliable result on this effect.