Research On Two-dimensional Positioning Technology Based On MET Vibration Sensor

Positioning technology is widely used in military and civilian applications.For example,A Line in the Sand System in the United States for battlefield ground detection uses various types of sensors to collect signals such as sound and ground vibration.Under the premise of ensuring concealment,it is used for detecting,classificating,locating and tracking invading targets.The system that uses the vibration sensor to locate the target in this project has the characteristics of good concealment,strong antiinterference ability,wireless transmission,low power consumption,and long-term stable operation.This research can not only play a role in preventing border crossing between China and the DPRK,but also has a good application prospect in the field of positioning bullets points and person vehicles,and important areas security.The main research content of this paper is:1?This research which take walking experiment man as the object of study first studied the vibration signal propagation mechanism of the source vibration.Through the experiment,three kinds of people with weights of 50 kg,70kg,and 90 kg are traveling at normal speed.The distance to sensors are 0.5m,1m,2m,5m,10 m,20m,30 m and 40 m.At the same time,the frequency,phase frequency and sensitivity characteristics of Molecule-Electronic induction acceleration sensors are studied.According to the spectrum characteristics of various types of signals obtained through analysis,the most suitable vibration sensor for this study is selected and compared.2?The classic two-dimensional location algorithms such as AOA,TOA,TDOA and TOA/AOA joint algorithm are introduced.And the advantages and disadvantages of each algorithm are analyzed.The location algorithm based on signal propagation time is mainly studied.The related delay estimation theory is analyzed and the correlation suitable for time difference is selected.The estimation algorithm uses quadratic correlation based on generalized cross-correlation to obtain a more accurate time delay estimate.At the same time,a detailed analysis of the Chan algorithm is performed,and the Chan algorithm is selected as the basic algorithm for solving the TDOA positioning results.3?This paper uses LabVIEW software to write software programs to quickly build a positioning system based on MET vibration sensor.Through real-time acquisition of test area ground vibration signal,this paper uses MATLAB to achieve TDOA algorithm to quickly identify and calculate information,meeting low noise conditions,not rely on other equipment such as base stations and satellites,to achieve more accurate positioning within a certain range,while the relationship between sensor placement and positioning accuracy in the area was studied.A large number of field experiments have shown that two-dimensional positioning technology based on MET vibration sensors can better determine the target position under the flat ground conditions in the field.