The Design Of The Detection System About Body Position And Movement Form Based On Pyroelectric Infrared Detector

Human detection is currently one of the most popular direction of scientific research workers, whether in the field of national defense military, or security in the city closely related to the general public, has important research value and broad applicat ion prospects. Pyroelectric infrared detector(PIR,Passive Infrared), because of its high sensitivity, low power consumption, stable performance, low cost advantages, is widely used in automatic intrusion, human characteristics identific ation, location detection, etc. This paper on the basis of research on the previous design, through the design of hardware to build experimental platform of large amounts of data acquisition and analysis, the time domain and frequency domain algorithm design, determines t he final scheme, and successfully to achieve the detection of the body position and movement form.From the scope of positioning accuracy and positioning, stability, power consumption and cost etc factors to consider, pyroelectric PIR detector is one of the most suitable sensor locate the human body. Design, through the lens of optical modulation and external structure, reduce the induction field sensor, in order to improve the sensor sensing direction, enhance the capacity of concentrated, with elongated sensor detection range, completed a wide range of positioning. Structures, the experiment platform, the induction of pyroelectric PIR detector signal of different human motion in time domain and frequency domain feature extraction, through the simulation and experiment, analyzes the implementation walk, run, jump, squat down in the four movements, designed the filter and action recognition algorithm, to step in the process of jumps from the extraction of the step and meter as an example, the algorithm valida tion. And by changing the installation height, the experimenter parameters such as distance, walk and experimental conditions, study the effects of external conditions on the sensing results. By designing the experiment, verify the detection range of the infrared sensing unit can reach 45 m, and it is concluded that the infrared induction field diagram of the induction unit. Through the outdoor experiment to validate the goals of the human body position and motion detection.Existing pyroelectric PIR detector human detection system can achieve the goal orientation, or that form of sports only 2-3 m within the scope of the inspection, this design not only has realized the remote human body target, and at the same time to achieve the goal of 12 m within the scope of simple motion detection. Design of high stability, low power consumption, and anti- jamming capability is strong, has important theoretical significance and use value.