Open AccessHigh‐sensitive acquisition method of GPS signal based on iridium assistance
Author(s) -
Zihuan Hao,
Lei Zhang
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2019.0529
Subject(s) - global positioning system , time delay and integration , gps signals , computer science , sensitivity (control systems) , signal (programming language) , doppler effect , real time computing , carrier to noise ratio , noise (video) , signal to noise ratio (imaging) , remote sensing , assisted gps , electronic engineering , telecommunications , engineering , physics , geography , artificial intelligence , computer vision , astronomy , image (mathematics) , programming language
Global positioning system (GPS) signal is severely attenuated in indoor, urban, and forest environments. To capture weak GPS signal, long‐time coherent integration and non‐coherent integration are used to increase signal to noise ratio (SNR). However, coherent integration time is constrained by Doppler frequency and navigation message, and the non‐coherent integration has square loss. Assisted GPS (AGPS) can effectively prolong the coherent integration time, but it is costly and has poor performance in rural areas. An Iridium‐assisted acquisition method is proposed here. The coherent integration time can be prolonged with Iridium‐assisted values of code phase, Doppler frequency, and navigation message. This method can effectively improve the acquisition sensitivity and reduce the average acquisition time. The Monte–Carlo simulation results show that the capture sensitivity can reach 15 dB‐Hz (CNR) with 200 ms coherent integration.