There is a widespread misconception within the spatial science community that the three geocentric datums widely used in Australia, GDA94, ITRF and WGS84 are identical “for all practical purposes”. This is a fair assumption for navigation and many mapping purposes, however users of wide area differential GPS and precise positioning services with a precision of less than a metre are beginning to...

Results from Global Positioning System (GPS) spoofing tests against Phasor Measurement Units (PMUs) are presented, demonstrating that PMUs are vulnerable to spoofing attacks. A GPS spoofer can manipulate PMU time stamps by injecting a counterfeit ensemble of GPS signals into the antenna of the PMU’s time reference receiver. A spoofer-induced timing error of only a few tens of microseconds cause...

Most integrated inertial navigation systems (INS) and global positioning systems (GPS) have been implemented using the Kalman filtering technique with its drawbacks related to the need for predefined INS error model and observability of at least four satellites. Most recently, a method using a hybrid-adaptive network based fuzzy inference system (ANFIS) has been proposed which is trained during...

The foundation of any orientation and navigation system for the blind is an accurate determination of the user’s position and the location of objects within his environment. This is also the reason why most available systems have weaknesses or even fail. In order to address this problem, we previously focused on indoor environments. One reason for this approach is that localization within indoo...

As part of a project for the Defense Advanced Research Projects Agency, Sandia National Laboratones’ Intelligent Systems & Robotics Center is developing and testing the feasibility of using a cooperative team of robotic sentry vehicles to guard a perimeter, perform a surround task, and travel extended distances. This paper describes our most recent activities. In particular, this paper highligh...

With real time traffic information, drivers on our highways can adapt and take action when encountering congestion. They can reschedule appointments or choose an alternate route. Existing systems that provide real time traffic information rely on infrastructure and human resources. These techniques are inaccurate, slow and require expensive infrastructure that provide limited coverage. We propo...

This paper presents an assistive system for the visually impaired and blind people which helps them using public transport means. The proposed system uses mobile phones as a medium for passenger information system and GPS (Global Positioning System), GSM (Global System for Mobile Communications) and Bluetooth technologies for location and communication purposes. In the proposed system sound mes...

Our recent work [1] proposed a coarse in-motion alignment method, in which the adverse effect of the Global Positioning System (GPS) antenna lever arm was reported. The current note improves [1] by accounting for the prior knowledge of the lever arm. This note uses the same set of symbols as in [1] for brevity. Suppose the GPS antenna is rigidly fixed relative to the inertial navigation system ...

We present our ongoing collaborative work on EnDroid, an energy-efficient GPS-based positioning system for the Android Operating System. EnDroid is based on the EnTracked positioning system, developed at the University of Aarhus, Denmark. We describe the current prototypical state of our implementation and present our experiences and conclusions from preliminarily evaluating EnDroid on the Goog...

In this research, a novel method of reconstructing 3D urban scene using vehicle-borne laser range scanners is proposed. Two one-dimensional laser range scanners are mounted on the roof of a vehicle, doing horizontal and vertical profiling respectively. As the vehicle moves ahead, a horizontal and vertical range profile of the surroundings is captured at each odometer trigger. The freedom of veh...