The digital systems portion of the project has three key elements. The first is the binary generator for the transmitter, consisting of a spread spectrum generator for the "Gold Code" family, together with a synchronized data bit generator. The second and third elements are the acquisition and tracking processors at the receiver. Both of these are supported by a 12-channel RF/IF and digital correlator board, originally designed for satellite navigation applications. Software was modified to accomplish acquisition and tracking of the down-converted 2.4 GHz signal. Attention was given to time and frequency search window size, acquisition speed, and code, carrier, and bit sync. Servo loops for maintaining code and carrier tracking coherency were evaluated by simulation, implemented in software, and used to control the correlator system across the PC bus.
 

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