System and method for continuous wave interference cancellation
AssigneeVeoneer US, Inc.
InventorsAlain Boutin, Xueru Ding
Life of this patent
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Abstract
Methods and systems for cancelling continuous wave interference in radar systems include defining an integration time period, dividing the integration time period into sub-periods during which the radar sensor system transmits a radar signal integrating a detected signal during both sub-periods to generate sub-period integrated values, wherein integration in the sub-periods is triggered at points of symmetrical opposite polarities of a down converted interferer signal having a non-integer number of cycles in each sub-period, and adding tire respective sub-period integrated values to cancel interference residue of opposite polarity in the respective sub-periods.
Claims20
A method of cancelling continuous wave interference in a radar sensor system configured to transmit a transmission radar signal at a carrier frequency, comprising:
- defining an integration time period, the radar sensor system being configured to integrate a detected signal during the integration time period, the detected signal including a continuous wave (CW) interferer signal;
- dividing the integration time period into a first sub-period and a second sub-period, the radar sensor system transmitting the transmission radar signal during the first sub-period and the second sub-period of the integration time period;
- integrating the detected signal during both the first sub-period and the second sub-period to generate respective sub-period integrated values, wherein integration in the first sub-period and second sub-period is triggered at points of symmetrical opposite polarities of a down converted interferer signal based on the CW interferer signal and having a non-integer number of cycles in each sub-period, resulting in interference residue in each of the respective sub-periods;
- and
- adding the first sub-period integrated value and the second sub-period integrated value to cancel the interference residue of opposite polarity in the respective sub-periods, so as to generate a corrected integrated value for the integration time period.
A radar sensor system with continuous wave (CW) interference cancellation, comprising:
- a transmitter for emitting a transmission radar signal at a carrier frequency;
- a receiver configured to detect a signal including reflections of the emitted transmission radar signal and a CW interferer signal;
- and
- a controller and/or processor for processing signals associated with the radar sensor system, the controller and/or processor:
- (i) defining an integration time period, the radar sensor system being configured to integrate a detected signal during the integration time period;
- (ii) dividing the integration time period into a first sub-period and a second sub-period, the radar sensor system transmitting the transmission radar signal during the first sub-period and the second sub-period of the integration time period;
- (iii) integrating the detected signal during both the first sub-period and the second sub-period to generate respective sub-period integrated values, wherein integration in the first sub-period and second sub-period is triggered at points of symmetrical opposite polarities of a down converted interferer signal based on the CW interferer signal and having a non-integer number of cycles in each sub-period, resulting in interference residue in each of the respective sub-periods;
- and
- (iv) adding the first sub-period integrated value and the second sub-period integrated value to cancel the interference residue of opposite polarity in the respective sub-periods, so as to generate a corrected integrated value for the integration time period.
Dependencies are inferred from the claim text.