US 12,019,446 B2
Filter for noise reduction in detection in remote sensing systems
Cheh-Ming Jeff Liu, Thousand Oaks, CA (US); and Alexander Charles Standridge, Westlake Village, CA (US)
Assigned to GM Cruise Holdings LLC, San Francisco, CA (US)
Filed by GM Cruise Holdings LLC, San Francisco, CA (US)
Filed on Dec. 31, 2020, as Appl. No. 17/139,579.
Application 17/139,579 is a continuation of application No. 16/224,472, filed on Dec. 18, 2018, granted, now 10,884,419.
Prior Publication US 2021/0124358 A1, Apr. 29, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G05D 1/00 (2006.01); G01S 7/35 (2006.01); G01S 7/4913 (2020.01); G01S 13/34 (2006.01); G01S 13/931 (2020.01); G01S 17/34 (2020.01); G01S 17/931 (2020.01)
CPC G05D 1/0214 (2013.01) [G01S 7/352 (2013.01); G01S 7/4913 (2013.01); G01S 13/341 (2013.01); G01S 13/931 (2013.01); G01S 17/34 (2020.01); G01S 17/931 (2020.01); G01S 7/356 (2021.05); G01S 2013/93271 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A sensing system, comprising:
a transmitter module that generates a first electromagnetic signal and emits a first portion of the first electromagnetic signal into an environment proximate to the sensing system, the first electromagnetic signal having a frequency modulated continuous wave (FMCW) waveform with a defined period, the first portion of the first electromagnetic signal being a transmitted electromagnetic signal, the defined period of the FMCW waveform comprises a leading interval and a terminal interval;
a receiver module that receives a reflected electromagnetic signal responsive to the transmitted electromagnetic signal, the reflected electromagnetic signal corresponding to a reflection of a portion of the transmitted electromagnetic signal by an object in the environment proximate to the sensing system;
a mixer module that mixes the reflected electromagnetic signal received by the receiver module and a second portion of the first electromagnetic signal generated by the transmitter module to output a mixed electromagnetic signal;
a switching component that filters the mixed electromagnetic signal such that the switching component causes a first temporal portion of the mixed electromagnetic signal corresponding to the leading interval of the defined period of the FMCW waveform to be removed, wherein the switching component causes a second temporal portion of the mixed electromagnetic signal corresponding to the terminal interval of the defined period of the FMCW waveform to be outputted; and
a processing unit that applies a fast Fourier transform (FFT) operation to the second temporal portion of the mixed electromagnetic signal corresponding to the terminal interval of the defined period of the FMCW waveform to generate object distance data pertaining to detection of the object, wherein the object distance data pertaining to the detection of the object is generated without the FFT operation being applied to the first temporal portion of the mixed electromagnetic signal corresponding to the leading interval of the defined period of the FMCW waveform.