Time-of-flight based ranging method and related ranging system
A technology of time-of-flight and ranging method, which is applied in the ranging system, in the field of ranging based on time-of-flight, can solve problems such as mutual interference and high time measurement accuracy requirements, and achieve the effect of avoiding mutual interference.
Active Publication Date: 2020-10-16
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology
Pulse modulation requires high time measurement accuracy. When multiple devices simultaneously perform time-of-flight distance measurement using pulse modulation on the same occasion, each device may receive reflected light signals generated by pulses sent by other devices, resulting in The situation of mutual interference has become one of the problems that need to be solved urgently
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[0012] The following disclosure provides various implementations or illustrations, which can be used to realize different features of the content of the application. The specific examples of elements / components and configurations described below are used to simplify the content of the present application. It is conceivable that these descriptions are examples only and are not intended to limit the content of the present application. For example, in the description below, forming a first feature on or over a second feature may include some embodiments wherein the first and second features are in direct contact with each other; and may also include Some embodiments have additional elements / components formed between the first and second features described above such that the first and second features may not be in direct contact. In addition, the content of this application may reuse element symbols and / or labels in multiple embodiments. Such repetition is for the sake of brevi...
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The invention discloses a distance measuring method based on the time of flight and a distance measuring system based on flight time. The distance measuring method includes the steps of intermittentlytransmitting a plurality of pulses from a pulse generation unit, wherein the plurality of pulses are fixed in pulse length but not fixed in transmission period, and the plurality of pulses are reflected by a target object to generate a plurality of reflected signals; enabling a time-of-flight sensor to respectively continue the plurality of reflected signals for a predetermined time according tothe transmission time of the plurality of pulses to perform signal sampling according to a sampling time interval so as to generate a sampling result; detecting the time of flight of the plurality ofpulses from the pulse generation unit to the time-of-flight sensor according to the sampling result; and judging the distance between the target object and a reference position according to the time of flight.
Description
technical field [0001] The present application relates to ranging and depth sensing technologies, and in particular to a time-of-flight based ranging method and a related ranging system. Background technique [0002] In the distance measurement technology based on time of flight (TOF), pulse modulation (pulse modulation) measures the distance of the target object through the time difference between the transmission and reception of optical pulses, and has a relatively simple measurement mechanism. Pulse modulation requires high time measurement accuracy. When multiple devices simultaneously perform time-of-flight distance measurement using pulse modulation on the same occasion, each device may receive reflected light signals generated by pulses sent by other devices, resulting in The situation of mutual interference has become one of the problems that need to be solved urgently. Contents of the invention [0003] An embodiment of the present application discloses a time-o...
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IPC IPC(8): G01S17/36G01S7/495G01S7/484
CPCG01S7/484G01S7/495G01S17/36
Inventor 杨孟达
Owner SHENZHEN GOODIX TECH CO LTD