Two frequency multifunctional radar for mobile application

A radar system for vehicles is presented working with two modules at different frequencies and a special arrangement of the modules. From the resulting Doppler spectra in the baseband and in the IF band the velocity, the tilt angle and the height with respect to ground, the direction of the movement of a vehicle and the classification of the road condition can be derived. Even if the baseband signals fail because of plane surfaces like a puddle the velocity can be extracted. This millimeter wave radar system was conceived to measure the velocity and at the same time to increase the performance of a simple Doppler radar.