Doppler resolution improvement in low-duty cycle transmission
AssigneeGM Global Technology Operations LLC
InventorsAlexander Pokrass, Igal Bilik, Moshe Laifenfeld
Life of this patent
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Abstract
A system and method for obtaining a Doppler frequency of a target are disclosed. A receiver receives a first plurality of samples of a first echo signal from the target and a second plurality of samples of a second echo signal from the target. The second plurality of samples is separated from the first plurality of samples by a time period. A phase shift is determined for the duration of the time period and the phase shift is applied to the second plurality of samples. The first plurality of samples is combined with the second plurality of samples to obtain combined samples, and the Doppler frequency for the target is obtained from the combined samples.
Claims18
A method of obtaining a Doppler frequency of a target, comprising:
- obtaining a first plurality of samples of a first echo signal from the target;
- obtaining a second plurality of samples of a second echo signal from the target, wherein the second plurality of samples is separated from the first plurality of samples by a time period having a duration;
- shifting the second plurality of samples with respect to the first plurality of samples by the time period to combine the first plurality of samples and the second plurality of samples;
- determining a phase shift corresponding to a duration of the time period for a frequency of the first echo signal determined from the first plurality of samples;
- applying the phase shift to the second plurality of samples to remove a discontinuity between a phase of the last sample of the first plurality of samples and a phase of the first sample of the second plurality of samples;
- and
- obtaining the Doppler frequency for the target from the combined samples.
A system for obtaining a Doppler frequency of a target, comprising:
- a receiver for receiving a first plurality of samples of a first echo signal from the target and a second plurality of samples of a second echo signal from the target, wherein the second plurality of samples is separated from the first plurality of samples by a time period having a duration;
- and
- a processor configured to:
- shift the second plurality of samples with respect to the first plurality of samples by the time period to combine the first plurality of samples and the second plurality of samples,
- determine a phase shift corresponding to a duration of the time period for a frequency of the first echo signal determined from the first plurality of samples,
- apply the phase shift to the second plurality of samples to remove a discontinuity between a phase of the last sample of the first plurality of samples and a phase of the first sample of the second plurality of samples, and
- obtain the Doppler frequency for the target from the combined samples.
Dependencies are inferred from the claim text.