DYNAMICALLY VARYING LASER OUTPUT IN A VEHICLE IN VIEW OF WEATHER CONDITIONS
First Claim
1. A method for dynamically varying pulse characteristics in a lidar system, the method comprising:
- emitting light pulses by a light source in a lidar system;
detecting, by a receiver in the lidar system, light from one of the light pulses scattered by one or more remote targets to identify a return light pulse;
determining an atmospheric condition at or near a geolocation of a vehicle that includes the lidar system; and
providing a control signal to the light source adjusting one or more characteristics of the light pulses, wherein the one or more characteristics of the light pulses are adjusted to compensate for attenuation or distortion of the return light pulse associated with the atmospheric condition.
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Accused Products
Abstract
To detect an atmospheric condition at the current location of a lidar system, a receiver in the lidar system detects a return light pulse scattered by a target and analyzes the characteristics of the return light pulse. The characteristics of the return light pulse include a rise time, a fall time, a duration, a peak power, an amount of energy, etc. When the rise time, fall time, and/or duration exceed respective thresholds, the lidar system detects the atmospheric condition such as fog, sleet, snow, rain, dust, smog, exhaust, or insects. In response to detecting the atmospheric condition, the lidar system adjusts the characteristics of subsequent pulses to compensate for attenuation or distortion of return light pulses due to the atmospheric condition. For example, the lidar system adjusts the peak power, pulse energy, pulse duration, inter-pulse-train spacing, number of pulses, or any other suitable characteristic.
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Citations
22 Claims
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1. A method for dynamically varying pulse characteristics in a lidar system, the method comprising:
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emitting light pulses by a light source in a lidar system; detecting, by a receiver in the lidar system, light from one of the light pulses scattered by one or more remote targets to identify a return light pulse; determining an atmospheric condition at or near a geolocation of a vehicle that includes the lidar system; and providing a control signal to the light source adjusting one or more characteristics of the light pulses, wherein the one or more characteristics of the light pulses are adjusted to compensate for attenuation or distortion of the return light pulse associated with the atmospheric condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lidar system comprising:
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a light source configured to emit light pulses; a scanner configured to scan a field of regard of the lidar system including direct the light pulses at different angles toward different points within the field of regard; a detector configured to detect light from some of the light pulses scattered by one or more remote targets to identify return light pulses and to generate respective pixels; and a controller configured to adjust one or more characteristics of the light pulses emitted by the light source, including; determine an atmospheric condition at or near a geolocation of a vehicle; and cause the light source to emit subsequent light pulses having one or more adjusted characteristics to compensate for attenuation or distortion of the return light pulses associated with the atmospheric condition. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A controller in a lidar system comprising:
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one or more processors; and a non-transitory computer-readable memory coupled to the one or more processors and storing instructions thereon that, when executed by the one or more processors, cause the controller to; provide a control signal to a light source to emit light pulses having pulse characteristics; determine an atmospheric condition at or near a geolocation of a vehicle associated with the lidar system; and in response to determining the atmospheric condition, provide a control signal to the light source to emit subsequent light pulses having one or more adjusted pulse characteristics to compensate for attenuation or distortion of return light pulses associated with the atmospheric condition. - View Dependent Claims (21, 22)
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Specification