US 12,596,176 B2Granted

Control method of lidar, and lidar

AssigneeHesai Technology Co., Ltd.

InventorsFeng Liang, Shaoqing Xiang, Congbo Shi, Xiaotong Zhou

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Abstract

A control method of a lidar is provided. The lidar includes a laser emitter array with N laser emitters. The control method includes: controlling n laser emitters to emit a first detection laser beam, and controlling k laser emitters among the n laser emitters to emit a second detection laser beam; receiving echoes, reflected by a target object, of the first detection laser beam and the second detection laser beam; calculating a distance of the target object according to the echoes; and reducing, in a case that the target object is detected in a preset distance, an emission intensity of the first detection laser beam emitted by at least parts of the n laser emitters in a range corresponding to the target object in a next detection period.

Claims22

Dependent claims

A control method of a lidar, wherein the lidar comprises a laser emitter array with N laser emitters, and the control method comprising:

S301:
controlling n laser emitters to emit a first detection laser beam, and controlling k laser emitters among the n laser emitters to emit a second detection laser beam, wherein n is less than or equal to N, the k laser emitters are selected from the n laser emitters, k is less than n, and a light intensity of the first detection laser beam is greater than a light intensity of the second detection laser beam;
S302:
receiving echoes, reflected by a target object, of the first detection laser beam and the second detection laser beam;
S303:
calculating a distance of the target object according to the echoes;
and
S304:
reducing, in a case that the target object is detected in a preset distance, an emission intensity of the first detection laser beam emitted by at least parts of the n laser emitters in a range corresponding to the target object in a next detection period.

6 more elements

A lidar, comprising:

a laser emitter array with N laser emitters, configured to emit a detection laser beam;
a receiving unit, comprising a detector array and configured to receive echoes of the detection laser beam reflected by a target object and convert the echoes into electrical signals;
and
a control unit, coupled to the laser emitter array and the receiving unit, and configured to calculate a distance of the target object according to the electrical signals, control n laser emitters to emit a first detection laser beam, and control k laser emitters among the n laser emitters to emit a second detection laser beam, wherein n is less than or equal to N, the k laser emitters are selected from the n laser emitters, k is less than n, and a light intensity of the first detection laser beam is greater than a light intensity of the second detection laser beam;
and the control unit is configured to reduce, in a case that the target object is detected in a preset distance, an emission intensity of the first detection laser beam emitted by at least parts of the n laser emitters in a range corresponding to the target object in a next detection period.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/145,333Filed 22 Dec 2022 · continuation
Priority: CN 202011315015.920 Nov 2020
Published: US 2023/0129970 A127 Apr 2023
Granted: 7 Apr 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G01S 7/4802
Of systems according to group G01S17/00: using analysis of echo signal for target characterisation; Target signature; Target cross-section
G01S 7/4815
Of transmitters alone: using multiple transmitters
G01S 7/484
Details of pulse systems: transmitters
G01S 7/4863
Circuits for detection, sampling, integration or read-out: detector arrays, e.g. charge-transfer gates