GPS-GNSS

This article concludes our series about the use of simulators and simulation techniques in developing GNSS receivers. Part 3 examines various simulator designs and whether the specifications of any given simulator equipment is suitable for a particular test.

This paper deals with the hardware implementation of base band (acquisition and tracking) modules of a GPS receiver using system generator 9.2 has been tried out. The  implementation will be tested on Lyrtech (small form factor-software defined radio) platform which consists of 3 layers. The upper layer is the radio frequency (1 GHz) layer, middle layer is the ADACMasterIII layer and the last is digital processing (DSP)
layer. The data transfer between the FPGA Virtex-4SX35 and DSP module is done using a TMS320DM6446 Davinci  processor. Generation of 17MHz Intermediate frequency has been done. The acquisition module based on parallel code phase search acquisition algorithm has been tried out. The
results are being tested for correctness and accuracy. After this the tracking module will be implemented. The results will lead to the development of indigenous GPS receivers with single and multiple channels within the same hardware with  reconfiguration

This paper presents the chest worn pulse
oximeter with integrated universal software radio peripheral
(USRP) with the global positioning systems (GPS) disciplined
clock transceiver from the National Instruments. It
illustrates the respiratory cardio monitoring using the
flexible reflective pulse oximeter with ECG. The gathered
cardio respiratory data assessed by the microcontroller and
the output is sent through to the remote monitor display by
means of wireless system. The device also incorporates an
early warning feature to alert then both the user and also the
person being monitored. The GPS device is included for
tracking and to determine the present location of the client
in case of an emergency situation. The output is then
transmitted and also displayed to a web based server via
radio frequency (RF). A complete hardware prototype model
is designed, developed, tested, and implemented thus
validated the proposed scheme. The statistical assessment
method is then integrated where the parameters gathered
are evaluated.

Pseudolites offer one solution to the problem of GPS
signal blockage indoors and in obstructed areas.
This article describes the efforts of a Japanese team
to develop an Intelligent Transportation System for
visually impaired pedestrians.

Invited lecture presented at the GPSC.NTU Positioning Group Friday Seminar. Lecture invited by Assoc. Prof. Dr. Law Choi Look, Director – Global Positioning Systems Centre, College of Engineering, School of EEE, Nanyang Technological University, Republic of Singapore

The paper describes in condensed form theoretical and experimental work on the design and validation of the prototype of the software-integrated navigation system consisting of the Differential Global Positioning System (DGPS) and Low-Cost Inertial Measurement Unit (IMU) MotionPak. The first section of the paper discusses the relevant hardware & software. The second part demonstrates an actual performance of the integrated system prototype mounted on a mobile landborne platform. The paper closes with the conclusions and summary.

This new textbook from Cambridge University Press describes GPS and GLONASS signals, as well as geophysical theory necessary for high accuracy calculation of satellite and user positions. The book is accompanied by a free academic version of software for a software receiver and signal simulator.