Estimating radars geolocation with range-difference method using two UAV

The article describes the possibilities of estimating radars geolocation with range-difference method using two UAVs. The range-difference method requires accurate binding time scales and coordinates of receivers based on UAVs, but not the digital multichannel re-ceivers building or the difficult antenna systems. The range-difference method is based on synchronous measurement of the difference between the arrival times of the pulse radar signal on the UAVs. To measure the delay time algorithm determines the leading edge of the pulse on the threshold level. Calculation of coordinates of the signal source is carried by the difference in times of arrival of signals on each of the UAVs.

The algorithm of estimating radars geolocation with range-difference method consists of the following steps:

1. Using the given UAVs coordinates and the initial approach to the assessment of signal source coordinates calculate vector of the cor-rections.

2. Calculate the accurate coordinates of signal source.

3. Compare the maximum value in the correction vector with a predetermined threshold level. If the amendment is less than the thre-shold level, then it exits the loop of the calculation of the coordinates, otherwise proceeds to step 1.

The algorithm modeling with different flight trajectories was done. The result of geolocation algorithm modeling is in the article. The re-sults show: that using this algorithm enables to make radars geolocation with range-difference method using two or more UAVs; increas-ing base (to 10 km) of the UAVs system leads to improved accuracy of the geolocation; for the geolocation with an accuracy of 100 me-ters is necessary to ensure accuracy of measuring time of the arrival of the signal is less than 100 ns.