Present scenario of nations security has become an important constrain. During war, tactics is main factor in any country’s security. There are many concerns regarding the safety of the soldiers M-Health enables GPS (Global positioning... more
Present scenario of nations security has become an important constrain. During war, tactics is main factor in any country’s security. There are many concerns regarding the safety of the soldiers M-Health enables GPS (Global positioning system) tracking of these soldiers using Smart sensor. GPS used to log the longitude and latitude so that direction can be known easily. A personal server will provide the connection to the server at the base station using a wireless communication. Every soldier’s belt is integrated with GSM (Global system for Mobile communication) module which enables the communication with the base station in case of injuries & calamities. In the proposed schema idea is to introduce a location tracking device for soldiers as well as to update status of the soldiers during the war.
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... more
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
Kinematic precise positioning is one of the main constraints of Global Positioning System. Double differencing and Precise Point Positioning method (PPP) is the most accurate positioning in GPS committee. The ionospheric delay in the... more
Kinematic precise positioning is one of the main constraints of Global Positioning System. Double differencing and Precise Point Positioning method (PPP) is the most accurate positioning in GPS committee. The ionospheric delay in the propagation of global positioning system (GPS) signals is one of the main sources of errors in GPS precise positioning and navigation. This error is cancelled in PPP approach by ionosphere free combination and reduced relatively in the approach of double differencing in case of short line (50 km), what about base line over 50 km. In this paper, Ionospheric delay has been eliminated with the availability of global or a local ionospheric map produced by varies organizations (e.g., International GNSS service (IGS)). [1], evaluate the ionospheric correction by Global Ionospheric Maps, provided in (IONEX) files produced by IGS. He shows that there is no significant effect of the provided GIM values on the solution of kinematic processing. The primary goal of this paper is to test the effect of evaluated Global Ionospheric Maps (GIMs), Modified-GIM, on precise relative kinematic positioning over varies baselines lengths extended up to hundreds km throughout comparing the relative kinematic solution with modified GIM for several baselines and kinematic PPP solution for the rover station. More accurate results were obtained by correcting ionospheric error over kinematic solution of many baseline lengths up to 300 km. The kinematic PPP solution for the rover stations was evaluated. It can be concluded that, PPP still the more accurate than relative approach even after correcting ionospheric error over longer baseline.
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... more
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... more
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.
