In the paper, digital radio frequency memory (DRFM) is applied to airborne radio fuze jammer to jam pulse distance-detecting fuze and pulse Doppler fuze.

Because a longer time for the radar pulse to return would imply a greater distance, the Controller would then make adjustments based on an incorrectly estimated position.

From the return pulse, LOLA determines the time of flight which, accounting for the speed of light, reveals the distance from the spacecraft to the lunar surface.