Object existence detection device and method

Abstract

The invention relates to an object existence detection device and method. The device comprises a UWB transceiver which comprises a transmitting end and a receiving end and is used for transmitting and receiving UWB pulse signals; a time recording unit which is used for recording the time duration from the time when the UWB transceiver transmits the preset pulse signals to the time when the pulse signals are reflected back and received by the UWB transceiver, wherein if no object exists, the receiving end receives multiple UWB pulse signals reflected through multiple paths of the surrounding environment and flying time of the UWB pulses through the shortest multipath reflection path is recorded as Tm, and if the detection result indicates existence of objects, the UWB pulse signals transmitted by the UWB transceiver return to the receiving end of the UWB transceiver, and flying time of the UWB pulses through the shortest reflection path is recorded as Tn; and a judgment unit which is used for comparing Tn and Tm, wherein if Tn<Tm, there are objects existing near the UWB transceiver through judgment, or there is no object existing near the UWB transceiver.

Description

technical field [0001] The invention relates to an object existence detection technology, in particular to a method and a device for judging whether an object exists by using UWB technology. Background technique [0002] At present, with the increasing application of Internet of Things technology in industrial production and people's life, information sensing technology is becoming more and more important as an important link in Internet of Things technology. In many IoT systems, it is necessary to detect the existence of objects, including people, vehicles, objects, etc. For example, the detection of pedestrians in the elevator of the shopping mall, the status detection of all parking spaces in an automated parking lot, and the detection of the position of raw materials in the field of industrial automation. [0003] There are many methods for detecting the existence of objects, such as ultrasonic method, pyroelectric infrared method, Doppler microwave radar, active infrar...

AI Technical Summary

Problems solved by technology

These detection methods have been applied in various fields, but each of them also has inherent defects. For example, the ultrasonic method judges the existence of the object by measuring the distance change of the target object, but the penetration ability is poor; Causes thermal radiation to detect the existence of objects, and cannot respond to constant temperature objects; Doppler microwave radar can only detect moving objects, but cannot detect static objects; active infrared detection detects the existence of objects through the reflection of infrared light, but it is easy to be polluted. Its application is limited; the geomagnetic disturbance detection method has the advantage of low power consumption, but it can only be used for the detection of metal objects

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