IP Library › Granted Patent US 9,851,433
Granted Patent B2
US 9,851,433 · App. 14/575,642 · Granted Dec 26, 2017

Single laser LIDAR system

Inventors: Richard Sebastian (Frederick, MD); Kendall Belsley (Falls Church, VA)
Assignee: DSCG Solutions, Inc.
G01S7/4814G01S7/493G01S17/06G01S17/325G01S17/58
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Quick Facts
Patent No.
US 9,851,433
App. No.
14/575,642
Granted
Dec 26, 2017
Kind
B2
Abstract

In one general aspect, a non-transitory computer-readable storage medium storing instructions that when executed cause one or more processors to perform a process. The process can include producing emitted electromagnetic radiation based on a frequency pattern and receiving reflected electromagnetic radiation reflected from an object. The process can include defining combined frequency data based on a frequency of the emitted electromagnetic radiation and a frequency of the reflected electromagnetic radiation. The process can also include defining a set of spectral bins, based on a Fourier transform, in a frequency domain based on the combined frequency data, and can include identifying a subset of the set of spectral bins.

Claims (54)

1. A non-transitory computer-readable storage medium storing instructions that when executed cause one or more processors to perform a process, the process comprising:

producing emitted electromagnetic radiation based on a frequency pattern;

receiving reflected electromagnetic radiation reflected from an object;

defining combined frequency data based on a frequency of the emitted electromagnetic radiation and a frequency of the reflected electromagnetic radiation; and

defining a set of spectral bins, based on a Fourier transform, in a frequency domain based on the combined frequency data,

wherein the process further comprises:

identifying a subset of the set of spectral bins; and

producing time series data based on the subset of the set of spectral bins using an inverse Fourier transform.

2. The non-transitory computer-readable storage medium of claim 1 , further comprising:

defining a frequency based on the set of spectral bins.

3. The non-transitory computer-readable storage medium of claim 1 , wherein the identifying the subset of the set of spectral bins is based on a criteria related to a number of spectral bins adjacent a maximum spectral bin.

4. The non-transitory computer-readable storage medium of claim 1 , further comprising:

defining phase angle data based on the time series data.

5. The non-transitory computer-readable storage medium of claim 4 , further comprising:

identifying a datapoint from the phase angle data as an outlier.

6. The non-transitory computer-readable storage medium of claim 5 , further comprising:

modifying the combined frequency data based on the datapoint.

7. The non-transitory computer-readable storage medium of claim 1 , further comprising:

dividing the combined frequency data into at least a first segment of combined frequency data and a second segment of combined frequency data,

the defining of the set of spectral bins is based on the first segment of the combined frequency data.

8. The non-transitory computer-readable storage medium of claim 7 , further comprising:

identifying the first segment of the combined frequency data as an outlier segment of the combined frequency data.

9. The non-transitory computer-readable storage medium of claim 1 , wherein the emitted electromagnetic radiation is amplified by an optical amplifier.

10. An apparatus, comprising:

a laser configured to produce emitted electromagnetic radiation based on a frequency pattern;

a receiver configured to receive reflected electromagnetic radiation reflected from an object; and

an analyzer configured to define combined frequency data based on a frequency of the emitted electromagnetic radiation and a frequency of the reflected electromagnetic radiation, the analyzer configured to iteratively perform spectral analysis on the combined frequency data until a beat frequency is determined based on a threshold condition,

wherein the spectral analysis includes producing time series data based on a set of spectral bins using an inverse Fourier transform.

11. The apparatus of claim 10 , wherein the spectral analysis further includes:

defining a set of spectral bins, based on a Fourier transform, in a frequency domain based on the combined frequency data; and

identifying a subset of the set of spectral bins.

12. The apparatus of claim 11 , wherein the identifying the subset of the set of spectral bins is based on a number of spectral bins adjacent a maximum spectral bin.

13. An apparatus, comprising:

a laser configured to produce emitted electromagnetic radiation based on a frequency pattern;

a receiver configured to receive reflected electromagnetic radiation reflected from an object;

an analyzer configured to define combined frequency data based on a frequency of the emitted electromagnetic radiation and a frequency of the reflected electromagnetic radiation, the analyzer configured to iteratively perform spectral analysis on the combined frequency data until a beat frequency is determined based on a threshold condition,

wherein the spectral analysis includes defining phase angle data based on time series data.

14. The apparatus of claim 13 , wherein the spectral analysis further includes identifying a datapoint from phase angle data as an outlier.

15. The apparatus of claim 14 , wherein the spectral analysis further includes modifying the combined frequency data based on the datapoint.

16. The apparatus of claim 10 , wherein the spectral analysis further includes:

dividing the combined frequency data into at least a first segment of combined frequency data and a second segment of combined frequency data.

17. The apparatus of claim 10 , wherein the threshold condition includes performing a specified number of iterations.

18. The apparatus of claim 10 , wherein the emitted electromagnetic radiation is amplified by an optical amplifier.

19. A method, comprising:

defining combined frequency data based on a frequency of electromagnetic radiation emitted toward an object from a laser and a frequency of electromagnetic radiation reflected from the object;

defining a set of spectral bins based on the combined frequency data;

identifying a subset of the set of spectral bins;

producing time series data based on the subset of the set of spectral bins

defining phase angle data based on the time series data; and

modifying the combined frequency data based on the phase angle data.

20. The method of claim 19 , wherein the identifying the subset of the set of spectral bins is based on a criteria related to a number of spectral bins adjacent a maximum spectral bin.

21. The method of claim 19 , wherein the set of spectral bins is defined using a Fourier transform in a frequency domain, and the producing time series data is based on the subset of the set of spectral bins using an inverse Fourier transform.

22. The method of claim 19 , further comprising:

amplifying the electromagnetic radiation emitted toward the object from the laser.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 18, 2015
From: SEBASTIAN, RICHARD; BELSLEY, KENDALL
To: DSCG SOLUTIONS, INC.
Reel/Frame 037336/0387 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 2, 2015
From: SEBASTIAN, RICHARD; BELSLEY, KENDALL
To: DSCG SOLUTIONS, INC.
Reel/Frame 035807/0883 →
Continuity (2)
Provisional Application 61918525 · Dec 19, 2013
Related Publication 20150177367A1 · Jun 25, 2015