ABSTRACTThis paper describes an investigation of the use of the Global Positioning System (GPS) to calibrate an instrumentation radar. An existing calibration program called STARCAL was used to perform computer simulations. The accuracy of STARCAL is used as a comparison as well as a guide to design simulation scenarios. It is shown that for a comparable calibration accuracy, the proposed procedure would require many hours to complete. Based on this and other findings, it is concluded that the proposed method is not practical. However, it is recommended that measurements be made to ascertain the true radar cross section (RCS) of the GPS satellites and the variation of it, so that a future analysis can be made to refine the current findings.