The Satellite Navigation and Positioning (SNAP) group at The University of New South Wales (UNSW) has been actively conducting research into high precision kinematic GPS, alone and in combination with pseudolites, for the past eight years and two years respectively. This has led to the development of innovative carrier phase single-epoch ambiguity resolution procedures, and software programs th...

Positioning is a fundamental problem in mobile robot navigation. Several approaches to cope with the dynamic positioning problem have been made. Most of them are based on the inconsistent use of the algorithm for static positioning enhanced by predictive algorithms. In this paper, a method that guarantees the consistent use of this algorithm at any time under dynamic condition is presented. It ...

In this paper we present a visual navigation system for retrieving untethered autonomous underwater vehicle (AW). The vision qstern guides the .4LV into a retriever which is a tethered underwater robot. The visual navigation modules include target searchin& line tracking, and positioning. The vision system is a dedicated parallel image processor composed of three T800 (Transputer). The processi...

It is challenging to develop a control algorithm that uses only one sensor to guide an autonomous vehicle. The objective of this research was to develop a control algorithm with a single sensor for an autonomous agricultural vehicle that could identify landmarks in the row-type plantation environment and navigate a vehicle to a point-to-go target location through the plantation. To enable such ...

The Global Positioning System (GPS) has made navigation systems practical for a number of land-vehicle navigation applications. Today, GPS-based navigation systems can be found in motor vehicles, farming and mining equipment, and a variety of other land-based vehicles (e.g., golf carts and mobile robots). In Section II of this paper, each of these applications is discussed, and the reader is in...

For the realization of driving assistance and safety systems vehicles are being increasingly equipped with sensors. As these sensors contribute a lot to the cost of the whole package and at the same time consume some space, car manufacturers try to integrate applications that make use of already integrated sensors. This leads to the fact that each sensor has to fulfil several functions at once ...

An enhanced odometry method coupled with an inertial navigation sensor is introduced for skid-steered vehicle positioning in outdoor environments. In the proposed scheme, robot positioning and attitude is estimated based on an experimentally derived kinematic model. Besides, a low-cost INS unit is used to improve the quality of the rotational velocity of the robot as it is obtained by different...

Multi-constellation global navigation satellite systems (GNSSs) are expected to enhance the capability of precise point positioning (PPP) by improving the positioning accuracy and reducing the convergence time because more satellites will be available. This paper discusses the performance of multi-constellation kinematic PPP based on a multi-constellation kinematic PPP model, Kalman filter and ...