System and method for time-coded time-of-flight distance measurement

A technology of encoding time and flight distance, applied in the computer field, can solve problems such as difficult to meet the needs of high frame rate, low frame rate, error, etc., and achieve the effect of reducing photon entry, increasing frame rate, and reducing ambient light noise
CN110632578AActive Publication Date: 2019-12-31ORADAR TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ORADAR TECH CO LTD
Publication Date
2019-12-31

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Abstract

The invention discloses a system and method for time-coded time-of-flight distance measurement. The system includes a transmitter, a collector and a processing circuit; the transmitter is configured to transmit an optical signal pulse string having dual random time codes; the pulse string includes N pulse groups transmitted in the form of the second random time code, wherein the pulse groups include n pulses transmitted in the form of the first random time code; the collector is configured to collect photons in an optical signal pulse string reflected back by an object; the processing circuitis connected with the transmitter and the collector and is configured to count the photons to form N pulse group periodic single-photon counting time sequence strings; and a histogram is drawn based on the first random time code and the N pulse group periodic single-photon counting time sequence strings. With the system and the method adopted, the transmitter is allowed to transmit the pulse strings with a pulse period far shorter than the maximum time-of-flight corresponding to a maximum measurement range, so that a frame rate can be improved to a great extent.
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Description

technical field

[0001] The invention relates to the field of computer technology, in particular to a system and method for time-coded time flight distance measurement. Background technique

[0002] Time of flight (TOF) method calculates the distance of objects by measuring the flight time of light beams in space. Due to its advantages of high precision and large measurement range, it is widely used in consumer electronics, unmanned vehicles, AR / VR and other fields.

[0003] Distance measurement systems based on time-of-flight principles, such as time-of-flight depth cameras and lidar systems, often include a light source transmitter and a receiver. Calculate the distance of the object by calculating the time required for the light beam to be reflected and received. When using the direct time-of-flight method for measurement, the transmitter emits a pulsed beam to the target, and the pulsed beam is emitted at a certain frequency. The time interval (pulse period) between ad...

Claims

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