Reducing the number of false detections in a lidar system
First Claim
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1. A lidar system comprising:
- a light source including a mode-locked laser that includes an optical pump, the light source configured to emit a ranging pulse including a pseudo-random sequence of fast pulses generated by the laser, wherein one or more properties of the sequence of the fast pulses within the ranging pulse defines a signature of the ranging pulse;
a processor configured to modulate the optical pump to emit the ranging pulse and restart the optical pump for every ranging pulse emitted by the light source; and
a receiver configured to detect light scattered by remote targets, the receiver comprising;
a detector element configured to detect a light signal, anda signature detection circuitry configured to determine whether the detected light signal corresponds to the signature of the emitted ranging pulse;
wherein the lidar system is configured to generate a pixel value based on the detected light signal if the detected light signal corresponds to the signature of the emitted ranging pulse.
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Abstract
A light source includes a laser configured to emit a ranging pulse including a sequence of fast pulses. A lidar system uses one or more properties of the sequence of fast pulses to determine a signature of the ranging pulse. A receiver includes a detector element configured to detect a light signal and a signature detection circuitry configured to determine whether the detected light signal corresponds to the signature of the emitted ranging pulse. The lidar system is configured to generate a pixel value based on the detected light signal if the detected light signal corresponds to the signature of the emitted ranging pulse.
123 Citations
25 Claims
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1. A lidar system comprising:
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a light source including a mode-locked laser that includes an optical pump, the light source configured to emit a ranging pulse including a pseudo-random sequence of fast pulses generated by the laser, wherein one or more properties of the sequence of the fast pulses within the ranging pulse defines a signature of the ranging pulse; a processor configured to modulate the optical pump to emit the ranging pulse and restart the optical pump for every ranging pulse emitted by the light source; and a receiver configured to detect light scattered by remote targets, the receiver comprising; a detector element configured to detect a light signal, and a signature detection circuitry configured to determine whether the detected light signal corresponds to the signature of the emitted ranging pulse; wherein the lidar system is configured to generate a pixel value based on the detected light signal if the detected light signal corresponds to the signature of the emitted ranging pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method comprising:
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emitting, using a mode-locked laser, a ranging pulse including a pseudo-random sequence of fast pulses, including modulating an optical pump to emit the ranging pulse and restarting the optical pump for every N ranging pulses emitted by the light source, wherein N≥
2, wherein one or more properties of the sequence of the fast pulses within the ranging pulse defines a signature of the ranging pulse;detecting a light signal using a detector element; determining whether the detected light signal corresponds to the signature of the emitted ranging pulse; and in response to determining that the detected light signal corresponds to the signature of the emitted ranging pulse, generating a pixel value based on the detected light signal; otherwise, in response to determining that the detected light signal does not correspond to the signature of the emitted ranging pulse, discarding the detected light signal. - View Dependent Claims (22, 23, 24, 25)
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Specification