Accuracy evaluation of a Low-Cost Differential Global Positioning System for mobile robotics

TL;DR

This paper presents a low-cost, ROS-enabled DGPS setup using open-source software and a Ublox ZED-F9P chip, evaluating its accuracy for mobile robotics applications.

Contribution

It introduces a cost-effective DGPS system with open-source tools and assesses its accuracy compared to traditional systems in mobile robotics.

Findings

The low-cost DGPS achieves acceptable absolute accuracy for outdoor mobile robotics.

The system's accuracy is comparable when using different base station setups.

Repetitive accuracy remains consistent during mobile robot tracking.

Abstract

Differential GPS, commonly referred as DGPS, is a well-known and very accurate localization system for many outdoor applications in particular for mobile outdoor robotics. The most common drawback of DGPS systems are the high costs for both base station and receivers. In this paper, we present a setup that uses third-party open-source software and a Ublox ZED-F9P chip to build a ROS-enabled low-cost DGPS setup that is ready to use in a few hours. The main goal of this paper is to analyze and evaluate the repetitive and absolute accuracy of the system. The first measurement also examines the differences between a SAPOS base station and a locally installed one consisting of low-cost components. During the evaluation process of the absolute accuracy, a moving mobile robot is used on the receiver side. It is tracked through a highly accurate VICON motion capture system.