Abstract: A radar system and method include a first transmitted radar signal having a first frequency and a second transmitted radar signal having a second frequency different from the first frequency. A receiver receives reflected radar signals generated by reflection of the transmitted radar signals and generates receive signals indicative of the reflected radar signals, a first receive signal being indicative of a first reflected radar signal generated by reflection of the first transmitted radar signal, and a second receive signal being indicative of a second reflected radar signal generated by reflection of the second transmitted radar signal. A processor receives the first and second receive signals and computes a difference between the first and second receive signals to generate a difference signal, the processor processing the difference signal to provide radar information.

Abstract: Short-range vehicular radar systems are described. In one implementation, an apparatus used in radar applications includes a programmable digital receiver having an adaptable interference filter that is configured to reject radar pulses received from another radar system. In another implementation, a short-range vehicular radar system includes receive and transmission antennae, a programmable delay generator, and programmable receiver. The programmable delay generator is configured to control transmission of pulses from the transmission antenna at randomly selected times to prevent ambiguities associated with target objects that are distances away from the transmission antenna that are greater than the speed of light times the pulse repetition rate divided by two. The programmable receiver is calibrated to sample signals received by the receive antenna relative to when the pulses are emitted from the transmission antenna.