Chirp frequency non-linearity mitigation in radar systems
AssigneeTexas Instruments Incorporated
InventorsSachin Bharadwaj, Karthik Subburaj
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Abstract
The disclosure provides a radar apparatus. The radar apparatus includes a transmit unit that generates a first signal in response to a reference clock and a feedback clock. The first signal is scattered by one or more obstacles to generate a second signal. A receive unit receives the second signal and generates N samples corresponding to the second signal. N is an integer. A conditioning circuit is coupled to the transmit unit and the receive unit. The conditioning circuit receives the N samples corresponding to the second signal, and generates N new samples using an error between the feedback clock and the reference clock.
Claims20
A radar apparatus comprising:
- a receive unit having a receive antenna unit and a mixer, wherein the receive unit is configured to receive a second signal, the mixer is configured to mix the second signal and a first signal to generate an IF (intermediate frequency) signal, and the receive unit is further configured to generate N samples from the IF signal, wherein N is an integer;
- and
- a conditioning circuit having a filter, the conditioning circuit coupled to the receive unit and configured to receive the N samples, and configured to:
- generate new sampling time instants of the N samples responsive to an error between a feedback clock and a reference clock, wherein the feedback clock is generated from the reference clock and the first signal is generated based on the feedback clock;
- and
- resample the N samples using the new sampling time instants and generate N new samples.
A method comprising:
- receiving a second signal in a receive unit, the receive unit having a receive antenna unit and a mixer;
- mixing the second signal and a first signal to generate an IF (intermediate frequency) signal;
- generating N samples from the IF signal in the receive unit, and N is an integer;
- generating new sampling time instants of the N samples responsive to an error between a feedback clock and a reference clock, the feedback clock is generated from the reference clock and the first signal is generated based on the feedback clock;
- and
- resampling the N samples using the new sampling time instants and generating N new samples.
Dependencies are inferred from the claim text.