Automotive radars use very complex algorithms to process the signals coming from various targets. Usually the radar chip manufacturers (Infineon, NXP, TI) provide some very basic algorithms just to show how their chipsets works. To decide what kind of targets are around the car, the system needs very fast and complex processing data algorithms. Information as target position, target cross-section (dimensions), target velocity, needs all together to build a live image of the nearby targets.
Generally this complex processing data is done by the customer of the radar chipsets. For example, to make the radar decide that on the back of your car is a walking person or is a falling garbage bin (due to a heavy wind) probably you need smarter math algorithms than the ones which sent astronauts to the Moon 50 years ago.