Pulse digital MIMO radar system

A method for correlating received radio signals in a radar system, the method comprising:

• transmitting bursts of modulated radio signals with a plurality of transmitters of the radar system, wherein each respective modulation is defined by a selected subset of a code set, respectively, wherein the subsets are selected for orthogonality between transmitters, and wherein selected subsets comprise respective selected sequences of bits that are chosen from the code set such that the respective subsets exhibit lower cross-correlation than a pseudo-random generated selection of codes;
• receiving radio signals with a plurality of receivers of the radar system, wherein the received radio signals were transmitted by the transmitters and reflected from a plurality of objects in an environment, wherein each object of the plurality of objects comprises a corresponding distance and round-trip echo delay with respect to the plurality of receivers;
• and
• correlating with a processor the received radio signals with the selected subsets to determine corresponding round-trip echo delays and thus the corresponding distances, wherein the processor correlates the received radio signals for a selected quantity of range bins during a radar scan, wherein at least one of the quantity of range bins, the quantity of transmitters, and the quantity of transmission bursts per radar scan is selected such that each selected subset is orthogonal to every other selected subset, and wherein the product of the quantity of range bins with the quantity of transmitters of the plurality of transmitters is less than a quantity of transmission bursts per radar scan.