LDG-100 radio altimeter works in C-band, which is a pulse Doppler working system. The sensitivity device adopts heterodyne type, and the antenna terminal circulator adopts the common mode of transceiver. The technology of the altimeter is mature. It is equipped with missiles and used as the control of altimeter fuze. It has the ability of high explosive height, high falling speed adaptability, anti ground clutter and sea clutter performance, and adopts pseudo-random pulse modulation technology, The pulse period is random in the given period range, which makes it difficult for jammer to determine the initial modulation pulse of fuze signal, and then to predict the delay pulse, so as to increase the anti active jamming ability.