By measuring time difference peak to peak value of pyroelectric signal

distance from target to detector can be calculated. When the target personnel vertically passing through pyroelectric sensor detection field

distance value can be well measured. As for the target personnel is beveling into the detection field

the existing distancemeasuring methods appear larger error. Therefore

on the basis of experiment

improve and revise the existing algorithm

achieve effective measurement when target is beveling into detection field with 60° of view in range of 30 m

broadens application scope of time difference method for distance-measuring

and has good application value and market prospects.