A Study on Combined GPS/GLONASS RTK Receiver Using Embedded Platform and Field Test Results in Urban Area
Byung-Hyun Lee, Sung-Hyuck Im, Seung‐Hwan Yoo, Gyu-In Jee · 17th ITS World CongressITS JapanITS AmericaERTICO · 2010
In these days, land vehicles demand more accurate and reliable GNSS receivers. Especially in urban area, there are many tall buildings and it makes wide-shadow areas, thus the GNSS receivers have low reliability, availability, and integrity. But combined GPS/GLONASS is expected to reduce these problems of satellite navigation. In the previous research, combined GPS/GLONASS receiver enhanced the probability of obtaining position from 87% to 98% using standalone algorithm in Teheran Street, Seoul, Korea. And RTK algorithm can improve the positioning accuracy. But for RTK algorithm, the wireless network to receive the observations from base station should be peaceful. And phase measurements have to be acquired stably. Unfortunately, it is very difficult in urban area. That is why the positioning results by various algorithms have to be given. Navigation performance based on an embedded board must be evaluated. Because a navigation algorithm for land vehicles should be operated using an embedded board with low CPU in real time. In this paper, a combined GPS/GLONASS RTK receiver for an embedded platform was implemented and evaluated by a driving experiment in an urban area. In the experiment, positioning results were calculated using an evaluation kit using RMI AU1250 CPU in real time. As a result, positioning performance up to distinguishing between one lane and another lane was obtained in the highway environment.