Expert Systems for Passive Radar Configuration

The configuration of passive radar sensors can be a challenging and time-consuming task, which can be simplified and accelerated by expert systems based on artif-ical intelligence. An intuitive method for implementing expert systems is fuzzy logic. The required procedures for transmitter selection and network characterization are strongly related to the used waveform. FM broadcast stations are operated as multiple frequency networks so that a high number of frequency bands can be selected. The detection performance can be predicted by models, which can be complemented by bandscan measurements. The required performance ranking can be implemented based on fuzzy logic. DAB and DVB-T2 stations are grouped in single frequency networks, which radiate the same signal and are synchronized in time and frequency. In order to avoid unfavorable interference conditions, the individual transmitter signals can be delayed additionally by the broadcast operator. These delays have to be estimated in order to calculate the correct bistatic ranges for target tracking. Two different estimations methods are presented in this paper. The results of different measurements can be combined and a decision must be made, if the reliability and accuracy is sufficient or the necessity for more measurements exists.