In this entry I will describe the geometry of multi-static passive radar and how it obtains a target solution. The multi-static passive TDOA radar example in this entry consists of a single receiving station that monitors the direct signals from the transmitters and indirect, multi-path signals from potential targets. Other configurations are possible but the 2D operation described requires 3 transmitter – receiver combinations. To obtain a target the system uses the time difference of arrival (TDOA) of the multi-path signal compared to the direct path signal from the same transmitter. Using these timings, solutions for possible target locations can be generated. I will cover the basic bi-static geometry on which this system relies and how it is incorporated into multi-static system. A 2D solution will also be derived from scratch for a multi-static system.
