The airborne distance measure interrogator obtains the distance information by the method of calculating the time between the interrogation pulse and the response pulse. After transmitted by the ground transmitter, the receiving response pulse is distorted through the influence of the space interference, the channel noise and the nonlinear. In the case of the channel characteristics cannot be changed, the composition and working principle of the distance measure system are introduced in this paper based on improving the availability of the signal. An analysis processing method of distorted quasi-gauss waveform is established and the reference for the design of airborne distance measure interrogator is given.