FREQUENCY ESTIMATION SYSTEMS AND METHODS FOR COHERENT RANGE ESTIMATION
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United States of America Patent
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Issued Date -
Oct 10, 2024
app pub date -
Mar 28, 2023
filing date -
Mar 28, 2023
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Abstract
A distance estimation method comprises transmitting a wave of radiation modulated in frequency domain by an emitter to a scene, receiving a reflection of the transmitted wave from the scene, and interfering a copy of the transmitted wave with the received reflection to generate a sequence of samples of the beat signal with wrapped phases in a time domain. The method also comprises estimating a frequency of the beat signal in the time domain in an iterative manner until a termination condition is met. The iterative estimation of the frequency of the beat signal is based on phase unwrapping of the samples of the beat signal subject to correlated phase error derived from phase noise statistics of the emitter and a linear regression fitting the frequency of the beat signal into the unwrapped phases of the beat signal.
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