Abstract: The present paper describes the studies on an intra-pulses linear frequency modulation (LFM) and inter-pulses binary phase shift keying (BPSK) compression radar altimeter. The design technology on subsystems is given. Performance verification test including the maximum detection height, IF echo signal, pulse compression test results, and final processed output of signal processor in different geomorphies have been presented. Flight test shows that high altitude pulse compression radar altimeter has superior performance in measuring altitude. All specifications are well in accordance with technical requirements.