This work presents the design, implementation, and end-to-end system concept and integration of a wireless data acquisition system for high-accuracy positioning applications. A wireless network of GPS-equipped sensor nodes, built from low-cost off-the-shelf components, autonomously acquires L1 GPS data for Differential GPS (DGPS) processing of raw satellite information. The differential process...

This article describes the current status of the Deep Space Network advanced systems research into ionospheric calibration techniques, based on Global Positioning System (GPS) data. A GPS-based calibration system is planned to replace the currently used Faraday rotation method by 1989. The SERIES receiver system used in this research determines the differential group delay of signals transmitte...

The most vital factor in the application of precision agriculture technology is the cost of the required high-technology equipment. The equipment cost is the major obstacle in adopting the precision agriculture. GPS receiver is one of the most essential tools with high initial costs in this technology. The aim of this study was to evaluate a low-cost GPS receiver in 3 different tests including ...

Proceedings of 2002 Core Technologies for Space Systems Conference, Colorado Springs, CO, November 2002 ABSTRACT The time, orbit and attitude data, obtained from GPS, enables spacecraft system developers to accomplish autonomous orbit maneuver planning and autonomous stationkeeping maneuvers on-board the spacecraft. Current generation GPS navigation will provide accuracy on the order of 2 to 5 ...

This paper describes a cooperative MANET protocol dedicated to intelligent transport systems, named CIVIC (Communication Inter Véhicule Intelligente et Coopérative). The CIVIC protocol is an auto-configuration inter-vehicle communication protocol, which supports adhoc and infrastructure networks, contains reactive and proactive routing components, and adapts different wireless standards. It is ...

the low noise amplifier is the key part for front-end device of the receiver in the GPS. A 1.8V 0.18um CMOS LNA for GPS applications has been designed. Two kinds of low noise amplifier (LNA) for single-end cascade structure and differential cascade structure respectively are presented in this paper. Cadence software is used to optimize the two circuits. It provides a series of good results in N...

ecently a special Independent Research and Development project demonstrated that translator-based differential Global Positioning System (GPS) measurements can achieve a measurement accuracy of 2 cm in realistic missile intercept test environments. The project was initiated in recognition of a serious need an effective precision analysis capability for use in evaluating engagements and lethalit...

Acceptable RTK GPS/GNSS performance is heavily dependent on a relativity unobstructed sky-view, where there are at least five satellites with good geometry available, and on the reliability of the wireless data link used for differential corrections. In “tough” GNSS applications where satellite occlusion is common, such as open cast mining, the RTK based technology often fails to deliver the re...