System, device and method for efficient MIMO radar
According to an aspect, a radar system comprising a transmitter operative to transmit a first set of chirps on a single transmit antenna and a second set of chirps on a plurality of transmit antennas, in that, the first set of chirps forming a first part of a chirp frame and the second set of chirps forming a second part of the chirp frame, a first receiver segment operative to generate a first set of parameters from a first set of received chirps that is reflection of the first set of chirps from one or more objects and a second segment operative to generate a second set of parameters from a second set of received chirps that is reflection of the second set of chirps from the one or more objects part of the received chirp frame and the first set of parameters, wherein, first set of parameters and second set of parameters comprise at least one of range doppler and angle of one or more objects.
1. A radar system comprising:
a transmitter operative to transmit a first set of chirps on a single transmit antenna and a second set of chirps on a plurality of transmit antennas, in that, the first set of chirps forming a first part of a chirp frame and the second set of chirps forming a second part of the chirp frame;
a first receiver segment operative to generate a seed information from a first set of received chirps that is reflection of the first set of chirps from one or more objects; and
a second receiver segment operative to generate a second set of parameters from a second set of received chirps and the seed information, in that the second set of received chirps are reflection of the second set of chirps from the one or more objects,
wherein, the seed information comprises at least one of range and Doppler, and the second set of parameters comprises the phase and magnitude of said Doppler.
2. The radar system of claim 1 , wherein the second receiver segment comprising:
a range processor operative to perform Fast Fourier Transform (FFT) on plurality of samples of the second set of received chirps to generate a first plurality of range bins;
a range selector selecting a first set of range bins in accordance with the seed information; and
a spectral estimator operative to determine phase and magnitude of a first set of Doppler in the seed information applying the first set of range bins.
3. The radar system of claim 2 , wherein the first receiver segment comprising:
an RD (Range Doppler) processor operative to perform Fast Fourier Transform (FFT) on plurality of samples of the first set of received chirps to generate second plurality of range bins and to perform another FFT transformation on the second plurality of range bins to generate a plurality of Doppler bins; and
a RD selector operative to select a second set of range bins and a first set of Doppler, that are above a threshold, from the second plurality of range bins and the plurality of Doppler respectively, in that seed information comprising the second set of range bins and the first set of Doppler.
4. The radar system of claim 1 , wherein the second set of chirps are divided into plurality of groups of chirps, corresponding in numbers with the plurality of transmit antennas, wherein chirps of each group are transmitted over corresponding one of the transmit antenna in the plurality of antennas.
5. The radar system of claim 2 , wherein the spectral estimator generates the angle and magnitude using relation:
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in that, α 0 through α (p-1) representing the magnitude and phase of the Doppler frequency corresponding to the first set of range bins for doppler samples x 0 through x (p-1) representing a matrix derived from Doppler frequencies in the set of Doppler bins.
6. The radar system of claim 4 , wherein the second set of chirps are consecutive and transmitted on the plurality of transmit antennas without interleaving.
7. The radar system of claim 1 , wherein the second receiver segment comprising:
a first spectral coefficient estimator operative to generate a first set of range bins by applying the seed information and a plurality of samples of the second set of received chirps; and
a second spectral estimator operative to determine phase and magnitude of a first set of Doppler in the seed information applying the first set of range bins.
8. A method of detecting plurality of objects in a radar system comprising:
splitting a chirp frame into two parts, first part and a second part;
transmitting the first part over a single transmit antenna and the second part over a multiple antennas;
receiving a reflected frame corresponding to the first and the second part;
extracting a first set of parameters as seed information from a first part of the reflected frame that corresponds to the first part of the transmitted frame; and
extracting other parameters from a second part of the reflected frame that corresponds to the second part of the transmitted frame,
wherein, the seed information comprises at least one of range and Doppler, and the other parameters comprises the phase and magnitude of said Doppler.