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

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.

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...

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Problems solved by technology

Therefore, the frame rate of the system is often limited by the maximum measurement distance. When the system measurement distance reaches 100 meters or even farther, the frame rate is very low, which is difficult to meet the high frame rate requirements of some practical applications.

[0004] In addition, when multiple systems work synchronously in the same space, interference is prone to occur, that is, the receiving end of a certain system will not only receive the optical signal from its own transmitting end, but also receive the optical signals emitted by the transmitting end of other systems. , causing an error

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