In order to make full use of advantages of high sensitivity and long detection distance of giant magnetoimpedance（ GMI） sensor in military target detection

output curve processing method of sensor is improved

target detecting model based on amplitude power change rate and wavelet characteristics is put forward

which not only make full use of GMI effect of sensitive material but also ensure measurement precision. Finally

effectiveness of model is proved by simulation target positioning experiment. Operation of the model is simple and easy to realize and precision of positioning is high

it has potential development space in targets detecting and tracking.