tof ranging system and mobile platform

Abstract

An embodiment of the present invention provides a TOF ranging system and a movable platform. The TOF ranging system includes: a light emitter, a receiver, a controller, and an optical system. The optical system includes a first optical signal processing device and a second optical signal processing device. At least one of the devices; the optical signal emitted by the light emitter passes through the first optical signal processing device to improve the radiation power density of the optical signal emitted by the light emitter; the optical signal reflected by the target object passes through the second optical signal processing device to improve the receiving The intensity of the light signal reflected by the target object received by the detector. The embodiments of the present invention can improve the signal-to-noise ratio of the TOF ranging system by increasing the radiation power density of the optical signal emitted by the light emitter, and / or increasing the intensity of the optical signal reflected by the target object received by the receiver, so that the TOF ranging system Target objects that are far away from the TOF ranging system can be detected, thereby improving the ranging range of the TOF ranging system.

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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