Dual-mode lidar system
First Claim
1. A method comprising:
- emitting, by a light source of a lidar system, a pulse of light;
detecting, by a receiver of the lidar system, at least a portion of the emitted pulse of light scattered by a target located a distance from the lidar system;
determining, by a processor of the lidar system, the distance from the lidar system to the target based at least in part on a round-trip time of flight for the emitted pulse of light to travel from the lidar system to the target and back to the lidar system; and
if (i) the distance to the target is greater than a particular maximum distance or (ii) at least one of a horizontal scan angle or a vertical scan angle is outside a respective particular range within a field of regard of the lidar system, then refraining from emitting a series of pulses of light, otherwise;
emitting, by the light source, the series of pulses of light, the series of emitted pulses of light having particular pulse-frequency characteristics;
detecting, by the receiver, at least a portion of the series of emitted pulses of light scattered by the target;
comparing, by a comparison module, the pulse-frequency characteristics of the series of emitted pulses of light with corresponding pulse-frequency characteristics of the detected series of scattered pulses of light to determine a velocity of the target with respect to the lidar system.
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Abstract
A method in a lidar system comprises emitting a pulse of light, detecting at least a portion of the emitted pulse of light scattered by a target located a distance from the lidar system, and determining the distance from the lidar system to the target based at least in part on a round-trip time of flight for the emitted pulse of light to travel from the lidar system to the target and back to the lidar system. The method further comprises emitting a series of pulses of light having particular pulse-frequency characteristics, detecting at least a portion of the series of emitted pulses of light scattered by the target, and comparing the pulse-frequency characteristics of the series of emitted pulses of light with corresponding pulse-frequency characteristics of the detected series of scattered pulses of light to determine a velocity of the target with respect to the lidar system.
131 Citations
24 Claims
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1. A method comprising:
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emitting, by a light source of a lidar system, a pulse of light; detecting, by a receiver of the lidar system, at least a portion of the emitted pulse of light scattered by a target located a distance from the lidar system; determining, by a processor of the lidar system, the distance from the lidar system to the target based at least in part on a round-trip time of flight for the emitted pulse of light to travel from the lidar system to the target and back to the lidar system; and if (i) the distance to the target is greater than a particular maximum distance or (ii) at least one of a horizontal scan angle or a vertical scan angle is outside a respective particular range within a field of regard of the lidar system, then refraining from emitting a series of pulses of light, otherwise; emitting, by the light source, the series of pulses of light, the series of emitted pulses of light having particular pulse-frequency characteristics; detecting, by the receiver, at least a portion of the series of emitted pulses of light scattered by the target; comparing, by a comparison module, the pulse-frequency characteristics of the series of emitted pulses of light with corresponding pulse-frequency characteristics of the detected series of scattered pulses of light to determine a velocity of the target with respect to the lidar system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A lidar system comprising:
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a light source configured to emit a pulse of light; a receiver configured to detect at least a portion of the emitted pulse of light scattered by a target located a distance from the lidar system; and a processor configured to determine the distance from the lidar system to the target based at least in part on a round-trip time of flight for the emitted pulse of light to travel from the lidar system to the target and back to the lidar system; wherein if (i) the distance to the target is greater than a particular maximum distance or (ii) at least one of a horizontal scan angle or a vertical scan angle is outside a respective particular range within a field of regard of the lidar system, then the light source is further configured to refrain from emitting a series of pulses of light, otherwise; the light source is further configured to emit a series of pulses of light having particular pulse-frequency characteristics; the receiver is further configured to detect at least a portion of the series of emitted pulses of light scattered by the target; and the lidar system further comprises a comparison module configured to compare the pulse-frequency characteristics of the series of emitted pulses of light with corresponding pulse-frequency characteristics of the detected series of scattered pulses of light to determine a velocity of the target with respect to the lidar system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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emitting, by a light source of a lidar system, a series of pulses of light having particular pulse-frequency characteristics; detecting, by a receiver of the lidar system, at least a portion of the series of emitted pulses of light scattered by a first target located a first distance from the lidar system; determining, by a processor of the lidar system, the first distance from the lidar system to the first target based at least in part on a round-trip time of flight for the series of emitted pulses of light to travel from the lidar system to the first target and back to the lidar system; and comparing, by a comparison module, the pulse-frequency characteristics of the series of emitted pulses of light with corresponding pulse-frequency characteristics of the detected series of scattered pulses of light to determine a velocity of the first target with respect to the lidar system, wherein each of the emitting, the detecting, the determining, and the comparing occurs in a first instance to generate a value of a first pixel, the method further comprising, in a second instance; emitting, by the light source, a single pulse of light; detecting, by the receiver, at least a portion of the emitted pulse of light scattered by a second target located a second distance from the lidar system; and determining, by the processor of the lidar system, the second distance from the lidar system to the second target based at least in part on a round-trip time of flight for the emitted pulse of light to travel from the lidar system to the second target and back to the lidar system to generate a value of a second pixel, wherein each of the first pixel and the second pixel correspond to respective ranging events of equal duration. - View Dependent Claims (21, 22)
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23. A method comprising:
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emitting, by a light source of a lidar system, a pulse of light; detecting, by a receiver of the lidar system, at least a portion of the emitted pulse of light scattered by a target located a distance from the lidar system; determining, by a processor of the lidar system, the distance from the lidar system to the target based at least in part on a round-trip time of flight for the emitted pulse of light to travel from the lidar system to the target and back to the lidar system; emitting, by the light source, a series of pulses of light having particular pulse-frequency characteristics, wherein the pulse-frequency characteristics of the series of emitted pulses of light comprise (i) an increasing pulse repetition frequency, (ii) a decreasing pulse repetition frequency, or (iii) a pseudo-random sequence of pulses of light having pseudo-random intervals of time between the pulses; detecting, by the receiver, at least a portion of the series of emitted pulses of light scattered by the target; and comparing, by a comparison module, the pulse-frequency characteristics of the series of emitted pulses of light with corresponding pulse-frequency characteristics of the detected series of scattered pulses of light to determine a velocity of the target with respect to the lidar system.
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24. A method comprising:
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emitting, by a light source of a lidar system, a pulse of light; detecting, by a receiver of the lidar system, at least a portion of the emitted pulse of light scattered by a target located a distance from the lidar system; determining, by a processor of the lidar system, the distance from the lidar system to the target based at least in part on a round-trip time of flight for the emitted pulse of light to travel from the lidar system to the target and back to the lidar system; selecting, by the processor and in view of the determined distance to the target, one or more of;
(i) a pulse energy of pulses in a series of pulses of light, (ii) a width of pulses in the series of pulses of light, and (iii) a number of pulses to be included in the series of pulses of light;emitting, by the light source, the series of pulses of light, the series of emitted pulses of light having particular pulse-frequency characteristics; detecting, by the receiver, at least a portion of the series of emitted pulses of light scattered by the target; and comparing, by a comparison module, the pulse-frequency characteristics of the series of emitted pulses of light with corresponding pulse-frequency characteristics of the detected series of scattered pulses of light to determine a velocity of the target with respect to the lidar system.
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Specification