tof ranging method and device

Abstract

An embodiment of the present invention provides a TOF ranging method and device, wherein the method includes: receiving a modulated optical signal per unit time; the modulated optical signal is transmitted by the transmitting end based on a first modulation sequence, and the first modulation sequence includes a preset number of Modulation instruction; based on the light energy of the modulated optical signal and the second modulation sequence, the anti-interference energy value corresponding to the unit time is obtained; the second modulation sequence is consistent with the first modulation sequence of the target transmitter; based on a preset number of continuous anti-interference The energy value gets the measured distance. According to the method and device provided by the embodiments of the present invention, the receiving end can filter the modulated optical signal received per unit time based on the second modulation sequence, effectively filtering the optical signals emitted by other transmitting ends in the multi-TOF system scenario. The interference caused by the modulated optical signal sent by the transmitter improves the accuracy of TOF ranging, is simple to implement, and has the advantage of accommodating a large number of TOF systems working at the same time.

Description

technical field [0001] Embodiments of the present invention relate to the field of time-of-flight technology, and in particular, to a TOF ranging method and device. Background technique [0002] The basic principle of TOF (Time of Flight) is to continuously emit light pulses to the object to be observed, and then use the sensor to receive the light returned from the object, and obtain the distance of the target by detecting the time of flight of the light pulse. [0003] When there are multiple TOF systems in the scene and multiple TOF systems work at the same time, the modulated light signal emitted by each TOF system will affect the modulated light signals of other TOF systems, resulting in the energy received by the sensor chips of other TOF systems are disturbed, resulting in measurement errors. [0004] In response to this problem, technicians avoid interference signals generated by other TOF systems through adaptive frequency modulation, reducing the measurement error...

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a TOF ranging method and device to solve the problem of cross interference when multiple TOF systems work simultaneously

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