Distance measuring method and distance measuring system based on flight time
A technology of time-of-flight and ranging method, which is applied in time-of-flight-based ranging systems and in the field of time-of-flight ranging, which can solve problems such as distance estimation errors, low signal-to-noise ratio, and no signal detection.
Pending Publication Date: 2021-07-06
SHENZHEN ADAPS PHOTONICS TECH CO LTD
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For example, the receiver pixels (each SPAD) can be selectively turned on and then triggered, otherwise a very low signal-to-noise ratio will be obtained, or no signal can be detected, resulting in an error in distance estimation
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[0044] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.
[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0046] It wil...
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The invention relates to a distance measuring method and system based on flight time. The method comprises the steps that a light emitter emits probe light; a first sensing area is opened to receive the probe light reflected by a target object; sensing signals of all sensing subareas in the first sensing area are obtained respectively; effective peak signal intervals of the sensing subareas are obtained according to the sensing signals; a flight time range of the target object and a second sensing area are determined; the light emitter emits probe light again; a second sensing area is opened to receive the probe light reflected by the target object again, and sensing signals within the flight time range are obtained; and the distance of the target object is obtained according to the sensing signals in the flight time range. According to the invention, the measured distance of the target object is accurate, and the power consumption of accurate measurement is low.
Description
technical field [0001] The present invention relates to electromagnetic wave ranging, in particular to a distance measuring method based on time of flight, and also relates to a distance measuring system based on time of flight. Background technique [0002] Time of Flight (ToF) technology is a technology that emits detection light from the transmitter, and makes the detection light reflect back to the receiver through the target object, so that the object can be obtained according to the propagation time of the detection light in this propagation path. 3D imaging technology of the spatial distance of the sensor. [0003] In the ToF scheme based on the separate arrangement of the transmitting end and the receiving end, there is a parallax between the transmitting end and the receiving end. Therefore, the reflection signals of the laser beam emitted by the transmitting end at different distances will irradiate different pixels of the image sensor. In the ToF scheme, when th...
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IPC IPC(8): G01S17/08G01S7/4865G01S7/4915H04N25/46
CPCG01S17/08G01S7/4865G01S7/4915G01S17/10G01S7/487H04N25/00G01S7/4814G01S7/4816H04N25/44H04N25/46H04N25/75
Inventor 王乐天张超
Owner SHENZHEN ADAPS PHOTONICS TECH CO LTD