TOF distance measuring system and movable platform

Abstract

The invention provides a TOF distance measuring system and a movable platform. The TOF distance measuring system comprises a light emitter, a receiver, a controller, and an optical system. The optical system comprises at least one of a first optical signal processing device and a second optical signal processing device. Optical signals emitted by the light emitter are processed by the first optical signal processing device, and then the radiation power density of the optical signals emitted by the light emitter is improved. The optical signals reflected by a target object are processed by the second optical signal processing device, and the intensities of the optical signals reflected by the target object are improved. The radiation power density of the optical signals emitted by the light emitter is improved, and / or the intensities of the optical signals reflected by the target object received by the receiver are improved, and the signal to noise ratio of the TOF distance measuring system is improved, and the target object far away from the TOF distance measuring system is detected by the TOF distance measuring system, and therefore the distance measuring range of the TOF distance measuring system is improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of distance measurement, and in particular to a TOF distance measurement system and a movable platform. Background technique [0002] At present, a movable platform (such as an unmanned aerial vehicle, a detection robot, etc.) is provided with a detection device, and the detection device is used to detect obstacles around the movable platform, so as to prevent the movable platform from colliding with surrounding obstacles. [0003] Time Of Flight (TOF for short) is a commonly used ranging method. The TOF ranging method includes the phase modulation method. The phase modulation method refers to the light source of the TOF ranging system on the movable platform emitting a Amplitude-modulated continuous light signal, the light source is usually a light emitting diode (Light Emitting Diode, referred to as LED), when the continuous light signal irradiates the obstacle around the movable platform, the ...

AI Technical Summary

Problems solved by technology

[0004] But in the TOF ranging system, on the one hand, as the measurement distance increases, the intensity of the returned optical signal decreases, resulting in insufficient optical signal intensity received by the receiver. On the other hand, in order to obtain sufficient optical signal intensity, the integration time needs to be increased. At this time, the electrical power and optical power consumed will increase

Therefore, the current TOF ranging system can only detect obstacles that are relatively close, but cannot detect obstacles that are farther away

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