shift of approximately 1290 meters sec upon startup the computer aided target simulator program changes the personal computer 39 s real time clock frequency from 18 hz to 100 hz this allows the program to update all dynamic parameters in the system 100 times per second to minimize target movement step sizes during data runs the program is structured so that all system parameters are displayed on a single screen that is updated on a time available basis some of the parameters may be edited by the operator while others such as doppler frequency are derived and merely reported after calculation data run parameters are automatically documented with runlog files that are saved on the disk with each run the frequency converter consists of two circularly polarized antennas one transmit and one receive polarization switches a local oscillator mixers amplifiers and attenuators in this application the local oscillator was set at 25 ghz so that the mmw frequency of the signal emitted by the radar system under test is converted down to the x band frequency region the operating region of the digital radio frequency memory after treatment by the digital radio frequency memory the now altered signal is up converted to the mmw frequency used by the radar system however the target generator can be operated in any frequency region by simply applying a local oscillator of the appropriate frequency in order to provide a radar system under investigation with a realistic mmw target the target generator was developed the target generator is designed to receive a radar signal time delay and feed back.