| These years global navigation satellite systems become more and more flourishing both in technology and market, as GPS navigation service becomes worldwide popular, Compass and Galileo achieved prominent progress, and GLONASS restarts its development. In such a case, the demand of GNSS satellite signal generator is continuously increasing.GNSS satellite signal generator is such a device that can simulate signals of various systems in custom-built application scene of receiver. Calculating original simulating date which includes carrier’s track, observation data and navigation message is the key step during the whole working process. This thesis has done the following work aimed at system design and implementation.1. The architecture of GNSS satellite signal generator is proposed as five parts, test module, data module, manipulation module, digital signal simulating module, radio signal module, also the routing of system’s data frame flow and control frame flow are stated clearly.2. The carrier’s track model such as vehicle track, ship track, and JPL2track is analyzed and the math expression of each model is given out for reference. 3. A typical software process of observation data and navigation message are designed. Also a method for the synchronization between observation data and navigation message.4. This system’s test and manipulation module is introduced both in design and implementation.In this thesis, which focuses on the discussion of data frame flow and control frame flow and presents the test result at last chapter, a preliminary original simulating data software prototype of GNSS navigation satellite signal generator is realized. |
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