FKP Corrections Problem/Solution

There is a problem when using the PSR corrections component of the FKP system (typically with the ASCOS or Japanese systems). The nature of this problem is that it is possible the OEM4 will reject too many satellites and lose its calculated position. This problem seems to be caused by a non-standard use of the TGD term on the PSR corrections. The solution to this problem is to send the following command to the OEM4: PSRDIFFSOURCE NONE This will de-activate the FKP PSR corrections and stop the receiver from rejecting good satellites, which in turn will allow the GPS receiver to use the carrier phase corrections of the FKP system to generate a healthy RTK solution.