In this paper, we used FKP correction messages to improve DGPS position accuracy. To apply FKP correction to DGPS, we reformulated FKP correction on pseudorange and confirmed improvement of position accuracy. Conventional DGPS method cannot deal with remaining bias errors due to spatial decorrelation. FKP correction is one of Network-RTK methods to correct spatial decorrelation and give information of the distance-dependent errors between reference station and user in order to compensate them. We got No. 1034(FKP) message in RTCM V3.1 and did post-process by Matlab. We decoded it and calculated Position Accuracy. We made certain the improved Position Accuracy and compare to conventional DGPS Position Accuracy.  This paper’s result would be utilized on CAS (Collision Avoidance System), LKA (Lane Keeping Assist)

Keywords: FKP, DGPS, spatial decorrelation, position accuracy