4.5. Multiple access
Navigation satellites transmit signals that are received by receivers on the earth. Many satellites transmit the signal simultaneously which are spatially separated in their orbit. Multiple access (MA) is the ability of receivers to connect many satellites simultaneously and receive data from each without any affecting interference.
The receiver front end bandwidth cannot be increased in an unlimited fashion. An efficient MA scheme needs to be chosen so that the maximum numbers of satellites can be accessed by available resources. Mainly two types of MA are used for satellite navigation purposes: CDMA and FDMA. These are described below.
4.5.1. Code division multiple access
In previous sections, we already learned that by multiplying ...
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