Validation et augmentation du réalisme d'un simulateur de constellation GPS LI et évolution vers un simulateur GNSS

Abstract

Global Navigation Satellite System (GNSS) receiver use many constellations satellites systems. This approch improve signal availability and position’s precision. Knowing that Galileo and Compass systems aren’t covering the whole planet, it becomes essential to have a better product verification efficiency. It is always possible to test in a vehicule in motion. This method cost a lot of money to company and there are too much time spend uselessly. The main objective of this thesis is to generate in real time the GNSS navigation signal. The laboratory has already a GPS L1 simulator and it will be reuse. It has a lot of deficiencies and a complete validation of the product become necessary to fix major problems. So, a software verification will be done on pseudorange, Dopplers, satellite position and on the generation of navigation binary messages. Then, Intermediate Frequencies (IF) validation will be done precisely on navigation signal phases. When correction finished, eight simulations in static of 24 hours is executed on simulator GSS7700 from Spirent and LACIME’s laboratory with the same receiver. The average error of simulated position is around one meter for all simulations from twos simulators. So, performances gets from LACIME’s simulator are similar of a commercial simulator. Dynamic simulation has been done with these two simulators. Indeed, three simulations of a same curve trajectory having a vehicule which moves to constant speed (5 m/s, 14 m/s and 28 m/s) was simulated with the same receiver. Results show that the maximum average of the position’s error is below 0,5 meter for the LACIME and Spirent simulator. The main challenge of accomplishing a GNSS simulator is to control the navigation signal generation and how to produce it to differents frequencies. Concept of GNSS simulator is relatively new, there is a lack of documentation about this subject.

Date	15 Jan 2013
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	René Jr. Landry (Supervisor) & Ammar B. Kouki (Co-supervisor)