The American Navstar GPS is a notable solution among the global satellite positioning systems. Every general purpose devices equipped with positioning capabilities (smartphones, navigation devices) are using the GPS. However, testing the GPS receivers on a demanding scenario (high speeds or altitude) can be expensive and involved. It is much more convenient to simulate the radio signals that the device-under-test can receive under the test‑scenario. GPS signal generation is about the simulation of the signal the receiver can receive at a certain position and speed.
In the beginning of my BSc thesis basics of the general satellite positioning systems and particularly the GPS system are introduced. GPS system are also detailed on its properties of the radio signal and the structure of the data stream.
Then the developed GPS signal generator is described, which can assembly the navigational messages and compute the Doppler-effect of the signal. The baseband signal is constructed by software and then by hardware as well.
Finally I draw conclusions of the generated GPS signal by analyzing it and show some potential fields in which the work I have started can be continued.