Passive Ranging Based on Accurate Prediction of Target Radiation Temperature

In this paper, a passive ranging method based on accurate prediction of target radiation temperature is proposed. Firstly, different wave bands are intercepted and the corresponding light radiation energy on two different wave bands are obtained; secondly, the temperature of target is estimated according to the linear relationship of the corresponding light radiation energy in two different wave bands; and the target can be equivalent to a blackbody of different temperature categories; thus, the range information of the target can be obtained, and the passive ranging error of air target can be realized. In this way, the target can be divided into different categories according to its own temperature, and the subspace of passive ranging can be effectively divided, which can provide a rule to avoid blindness for the subsequent target distance estimation. In the end of this paper, the accuracy of the method is verified by experiments, and the error of ranging accuracy is analyzed, which proves the feasibility of this method, and lays a foundation for future engineering applications.