The problem with arranging the antennas is I don’t know where one of them is. The whole scenarios is a GPS based semi autonomous grade control. the base unit is in a fixed location transmitting data bursts at 2 second intervals to all the machine mounted receivers. the data burst is made up of timestamps and “correction data” The Base transmitter is also a GPS receiver and has to be in an exact spot without being moved with an integrated antenna. The issue I am having is, as GPS equipped machines become more common I run into jobsites with multiple contractors running individual base stations. The engineers set everything up and it is difficult to get information from a contractor I am not servicing. The location of the other transmitter is mostly unknown. In addition to this I have ran into issues previously with other contractors walking on my signal and massive interference from an electrical substation since the job was at a power plant.

Touching on the decoding bit of your suggestion, The signal may in fact be identical or very very close. The correction data is made up of a time stamp and some bits of information to allow for location correction due to ionospheric interference with the satellite signals (1.4, 1.8 and 1.1 GHz). The signal is similar enough that the receivers get confused and cant decide which transmitter to listen too.

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