Development of Automation Test Suites for Validating GNSS Software
01 Apr 2018-
TL;DR: The application is developed to trigger the tests for checking the performance of GNSS hardware by taking the inputs from the user and to populate the location data results in tabular view dynamically, to pinpoint the obtained locations in a Map and also to populateThe obtained SNR values in a bar-chart.
Abstract: This paper is for understanding the GNSS System architecture, test procedure for GNSS and developing an application to control the GNSS hardware. GNSS (Global Navigation Satelite System) refers to a constellation of satelites providing signals from space transmitting positioning data encoded in the form of signals. There are six major constellations currently available in as per GNSS technology. These are GPS, GLONASS, GALILEO, BIEDOU, NAVIK and QZSS. To simulate these constellations, we can use Roof Antenna which provides desired radio frequency. The entire performance of GNSS product depends on Signal to Noise ratio and TTFF (Time To First Fix). The application is developed to trigger the tests for checking the performance of GNSS hardware by taking the inputs from the user and to populate the location data results in tabular view dynamically, to pinpoint the obtained locations in a Map and also to populate the obtained SNR values in a bar-chart. GNSS Test Application is a tool to execute various test cases and check the reliability of GNSS product. This application is written in C++. Gnss Command Line executable is developed with new features like start positioning session, stop session and resetting the GNSS Hardware. This CLI is written in C++.
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Book•
01 Jan 2008
TL;DR: The next generation of positioning models for positioning and data processing will depend on the design of the satellite itself, as well as on the satellite orbits it is placed in.
Abstract: Reference systems.- Satellite orbits.- Satellite signals.- Observables.- Mathematical models for positioning.- Data processing.- Data transformation.- GPS.- Glonass.- Galileo.- More on GNSS.- Applications.- Conclusion and outlook.
893 citations
"Development of Automation Test Suit..." refers methods in this paper
...The NAVSTAR-GPS (Navigation System for Timing and Ranging Global Positioning System) project was launched in 1973[4]....
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Book•
30 Apr 2009
TL;DR: The reader discovers how A-GPS enables the computing of a position from navigation satellites in the absence of precise time, a topic that has not yet been covered in any other book.
Abstract: Assisted GPS (A-GPS) has been developed to provide greatly improved capabilities, helping GPS work better and faster in almost any location. Offering a detailed look at all the technical aspects and underpinnings of A-GPS, this unique book places emphasis on practical implementation. The book reviews standard GPS design, helping you understand why GPS requires assistance in the first place. You discover how A-GPS enables the computing of a position from navigation satellites in the absence of precise time - a topic not covered in any other book. Moreover, you learn how to design and analyze a high sensitivity GPS receiver and determine the achievable sensitivity. The book provides detailed worksheets that show how to compute, analyze, and improve the processing gain from the input signal at the antenna to the signal after the correlators. These worksheets are used in the book to generate families of curves that completely characterize receiver sensitivity, parameterized in terms of front end noise figure, coherent and noncoherent integration times. From this work a law of achievable sensitivity is derived and explained in the book. This cutting-edge volume discusses special forms of assistance data, industry standards for A-GPS, and government mandates for location of mobile phones. You also find coverage of future global navigation satellite systems and how they can be designed specifically for instant-fixes and high sensitivity. The book features numerous tables, worksheets, and graphs that illustrate key topics and provide the equivalent of a technical handbook for engineers who design or use A-GPS.
407 citations
Additional excerpts
...difference data, positioning system, output module[6]....
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Book•
30 Jul 2009
TL;DR: The GNSS Signal Acquisition and Tracking (GSAT) as mentioned in this paper is a GNSS signal acquisition and tracking system that combines GNSS with RF systems to estimate position, velocity and time estimation.
Abstract: Satellite Navigation Overview - Introduction. GNSS Signal Acquisition and Tracking. Position, Velocity and Time Estimation. Differential GNSS: Accuracy and Integrity. A GPS Software Receiver. GNSS Combined with Other Navigation Systems. Combining GNSS with RF Systems. GNSS Applications - Aviation Applications. Space Applications. Geodesy and Surveying. Scientific Remote Sensing Using Bistatic GNSS Reflections.
170 citations
"Development of Automation Test Suit..." refers background in this paper
...GPS Satellite’s inbuilt have a atomic clock with very high precision[7]....
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Book•
22 Apr 2015
TL;DR: This book discusses the development of global navigation satellite systems, as well as applications of GPS, PNT, and other satellite positioning systems, over a 25-year period from 1990 to 2002.
Abstract: Chapter 1. Global Navigation Satellite Systems.- Chapter 2. Doppler Satellite Positioning, Telemetry and Data Systems.- Chapter 3. Precision and Navigational PNT Systems.- Chapter 4. Aided and Augmentation Systems, and Differential GPS.- Chapter 5. Applications of PNT Systems.- Chapter 6. National and International Governmental Policy Issues.- Chapter 7. Conclusions and Future Directions.- 8. Top Ten Things to Know About GNSS.- Appendix 1. Key Terms and Acronyms.- Appendix 2. Selected Bibliography.- Appendix 3. Selected Websites.
33 citations
TL;DR: The clock models, satellite orbit determination, ionospheric delay estimation, multipath mitigation, and GEO uplink subsystem (GUS) as used in the Wide Area Augmentation System developed by the FAA are discussed.
Abstract: This paper describes space-based augmentation for global navigation satellite systems (GNSS). Space-based augmentations increase the accuracy and integrity of the GNSS, thereby enhancing users' safety. The corrections for ephemeris, ionospheric delay, and clocks are calculated from reference station measurements of GNSS data in wide-area master stations and broadcast via geostationary earth orbit (GEO) satellites. This paper discusses the clock models, satellite orbit determination, ionospheric delay estimation, multipath mitigation, and GEO uplink subsystem (GUS) as used in the Wide Area Augmentation System developed by the FAA.
12 citations