Back to results
US 11,740,345 B2Granted
Dithering FMCW radar parameters to mitigate spurious signals
AssigneeTexas Instruments Incorporated
InventorsShankar Ram Narayana Moorthy, Karthik Subburaj, Anil KV Kumar
Life of this patent
Estimating the term…
Abstract
A method for a radar system includes transmitting, by a transmit channel of the radar system, a frame comprising first, second, and third chirps. Each chirp has a chirp start frequency, and the chirp start frequency of the transmitted chirps is dithered. The method also includes receiving, by a receive channel of the radar system, a frame of reflected chirps based on the transmitted frame, and generating a digital intermediate frequency (IF) signal.
Claims18
A method for a radar system, the method comprising:
- transmitting, by a transmit channel of the radar system, a frame comprising first, second, and third chirps, each chirp having a chirp start frequency, wherein the chirp start frequency of the transmitted chirps is dithered;
- receiving, by a receive channel of the radar system, a frame of reflected chirps based on the transmitted frame;
- generating a digital intermediate frequency (IF) signal;
- and
- dithering sampling window start times of the reflected chirps such that a time duration between sampling window start times of a first reflected chirp and a second reflected chirp is within ten percent of a time duration between sampling window start times of the second reflected chirp and a third reflected chirp.
2 more elements
A radar system, comprising:
- a radar transceiver integrated circuit (IC), comprising:
- a timing engine configured to generate one or more chirp control signals for controlling generation of chirps in the radar transceiver IC;
- a local oscillator coupled to the timing engine, the local oscillator configured to:
- receive the one or more chirp control signals;
- and
- transmit a frame comprising first, second, and third chirps, each transmitted chirp having a chirp start frequency;
- and
- a controller coupled to the timing engine, the controller configured to dither the start frequencies of the chirps and sampling window start times of an analog-to-digital converter (ADC) for reflected chirps received by the radar transceiver IC,
- wherein the controller is configured to dither the sampling window start times such that a time duration between sampling window start times of a first reflected chirp and a second reflected chirp is within ten percent of a time duration between sampling window start times of the second reflected chirp and a third reflected chirp,
- wherein at each sampling window start time, a frequency of the first reflected chirp is within ten percent of a frequency of the second reflected chirp, and of a frequency of the third reflected chirp.
7 more elements
A method for a radar system, comprising:
- dithering, by a controller of the radar system, a chirp start frequency of a plurality of transmitted chirps;
- and
- dithering, by the controller and for each reflected chirp in a plurality of reflected chirps corresponding to the plurality of transmitted chirps, a sampling window start time such that a time duration between sampling window start times of a first reflected chirp and a second reflected chirp is within ten percent of a time duration between sampling window start times of the second reflected chirp and a third reflected chirp,
- wherein, at each sampling window start time, frequencies of the first second, and third reflected chirps are within 10 percent of each other.
1 more element
Dependencies are inferred from the claim text.