US 11,231,489 B2 · Selective subband processing for a LIDAR system

Abstract

A signal processing system includes a time domain processing module to receive samples of a range-dependent time domain baseband signal in a frequency modulated continuous wave (FMCW) LIDAR system, and to generate and select time domain subband signals based on time domain subband selection criteria, a time domain to frequency domain converter coupled with the time domain processing module, to generate range-dependent frequency outputs from the selected time domain subbands, and a frequency domain processing module coupled with the time domain to frequency domain converter, to generate and select frequency domain subbands based on frequency domain subband collection criteria, and to detect energy peaks corresponding to target ranges in the field of view of the LIDAR system.

Claims14

Dependent claims

A frequency modulated continuous wave (FMCW) LIDAR system, comprising:

a memory;
and
a processor, operatively coupled to the memory, to:
receive samples of a time domain baseband signal comprising range-dependent difference frequencies in the FMCW LIDAR system;
generate a plurality of frequency subbands in a time domain;
select a first set of subband signals from the plurality of frequency subbands, the first set of subband signals having energy values that exceed an energy threshold;
select a second set of subband signals from the first set of subband signals, the second set of subband signals having signal-to-noise ratio (SNR) values that exceed an SNR threshold;
convert the second set of subband signals in the time domain to a third set of subband signals in a frequency domain, wherein the third set of subband signals is resampled and combined;
and
detect energy peaks and SNR peaks in the third set of subband signals to target ranges in a field of view of the FMCW LIDAR system.

7 more elements

A non-transitory computer-readable medium (CRM), with instructions therein that, when executed by a processor in a frequency modulated continuous wave (FMCW) LIDAR system, cause the processor to perform operations, comprising:

receiving samples of a time domain baseband signal comprising range-dependent difference frequencies in the FMCW LIDAR system;
generating a plurality of frequency subbands in the time domain from the samples of the range-dependent baseband signal;
selecting a first set of subband signals from the plurality of frequency subbands, the first set of subband signals having energy values that exceed an energy threshold;
selecting a second set of subband signals from the first set of subband signals, the second set of subband signals having signal-to-noise ratio (SNR) values that exceed an SNR threshold;
converting the second set of the subband signals from the time domain to a third set of subband signals in a frequency domain;
and
detecting energy peaks and SNR peaks in the third set of subband signals to target ranges in a field of view of the FMCW LIDAR system.

4 more elements

Dependencies are inferred from the claim text.

Selective subband processing for a LIDAR system

Life of this patent

Selective subband processing for a LIDAR system

Life of this patent

Abstract

Claims14