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US 12,313,723 B2Granted
Radar channel estimation
AssigneeKabushiki Kaisha Toshiba
InventorAlfred Daniel Wiffen
Life of this patent
Estimating the term…
Abstract
A radar return channel is estimated at a radar receiver by processing an existing channel estimate along with a radar return signal for an ideal transmission, to produce an updated estimate. Updating can be carried out based on a determination that the existing estimate has become degraded. Embodiments include using a least squares deconvolution to update polynomials describing a transfer function of the channel estimate.
Claims20
A method comprising:
- receiving a radar signal at a radar receiver, the received radar signal being consequent from a radar signal transmitted at a radar transmitter, the transmitted radar signal including an unknown distorted transmit waveform;
- assuming the unknown distorted transmit waveform;
- estimating a radar return channel using the received radar signal and the assumed distorted transmit waveform, the radar return channel being for a radar return channel defined between the radar transmitter and the radar receiver, the radar return channel being used to update an estimate of the transmitted radar signal;
- determining whether to update an estimate of the distorted transmit waveform using the estimated radar return channel;
- updating the estimate of the distorted transmit waveform using the estimated radar return channel when a level of noise in the received radar signal exceeds a pre-set threshold;
- and
- updating the radar return channel with the updated estimate of the distorted transmit waveform to converge on an accurate representation of a transmit waveform.
4 more elements
A radar receiver comprising:
- a signal processor operable to
- receive a radar signal at the radar receiver, the received radar signal being consequent from a radar signal emitted at a radar transmitter, the transmitted radar signal including an unknown distorted transmit waveform,
- assume the unknown distorted transmit waveform, and
- estimate a radar return channel using the received radar signal and the assumed distorted transmit waveform, the radar return channel being for a radar return channel defined between the radar transmitter and the radar receiver, the radar return channel being used to update an estimate of the transmitted radar signal;
- and
- a channel estimator operable to
- determine whether to update an estimate of the distorted transmit waveform using the estimated radar return channel estimate,
- update the estimate of the distorted transmit waveform using the estimated radar return channel when a level of noise in the receiver radar signal exceeds a pre-set threshold, and
- update the radar return channel with the updated estimate of the distorted transmit waveform to converge on an accurate representation of a transmit waveform.
6 more elements
A radar system comprising a radar transmitter for emitting a radar signal and a radar receiver, wherein the radar receiver comprises:
- a signal processor operable to
- receive a radar signal at the radar receiver, the received radar signal being consequent from a radar signal emitted at the radar transmitter, the transmitted radar signal including an unknown distorted transmit waveform,
- assume the unknown distorted transmit waveform, and
- estimate a radar return channel using the received radar signal and the assumed distorted transmit waveform, the radar return channel being for a radar return channel defined between the radar transmitter and the radar receiver, the radar return channel being used to update an estimate of the transmitted radar signal;
- and
- a channel estimator operable to
- determine whether to update an estimate of the distorted transmit waveform using the estimated radar return channel,
- update the estimate of the distorted transmit waveform using the estimated radar return channel when a level of noise in the received radar signal exceeds a pre-set threshold, and
- update the radar return channel with the updated estimate of the distorted transmit waveform to converge on an accurate representation of a transmit waveform.
6 more elements
Dependencies are inferred from the claim text.