产品简介/Product introduction
无线双模车位智能监测终端（简称双模车位传感器），是一款集成了三轴磁阻传感器，毫米波雷达传感器，无线NBIOT和LORAWAN传输方式，低功耗管理技术的智能停车监测产品，融合高效的双模联合检测算法，对车位上的磁场扰动变化进行监测，并通过毫米波雷达传感器进行状态确认，综合算法分析判断出该车位处于占用或空闲状态。支持LORAWAN、NB-IOT等多种传输方式上传数据至网关或运营商基站，网关或基站再传输至远程服务器。
该产品采用大容量电池供电，低功耗管理设计，埋入地面安装，壳体分体式设计，具有检出率高、工作稳定、无需布线、安装方便，维护简单，使用寿命长等特点，适用于室内停车场、市政路边停车、露天停车场，非法占道检测，违停监测等应用场合的智能管理。
Wireless dual-mode parking intelligent monitoring terminal (referred to as dual-mode parking sensor) is an intelligent parking monitoring product that integrates three-axis reluctance sensor, millimeter wave radar sensor, wireless NBIOT and LORAWAN transmission mode, and low power management technology. It integrates efficient dual-mode joint detection algorithm to monitor the magnetic field disturbance changes on the parking space. The status is confirmed by the millimeter-wave radar sensor, and the comprehensive algorithm analysis determines whether the parking space is occupied or idle. Support LORAWAN, NB-IOT and other transmission methods to upload data to the gateway or carrier base station, gateway or base station and then transfer to the remote server.
The product uses large capacity battery power supply, low power consumption management design, embedded in the ground installation, split shell design, with high detection rate, stable work, no wiring, easy installation, simple maintenance, long service life and other characteristics, suitable for indoor parking, municipal roadside parking, open parking, illegal occupation detection, etc. Intelligent management of applications such as illegal stop monitoring.
工作原理/Working principle
地球磁场的静态强度在0.5 至0.6 高斯，地球磁场在很广阔的区域内（大约几公里）其强度是一定的。当一个铁磁性物体，如汽车，置身于磁场中，它会使磁场扰动，放置于其附近的磁阻车位终端能测量出地磁场强度的变化，从而对车辆的存在性进行判断，在实际应用中发现，目前存在部分车辆（面包车，国产部分车型或新能源车，国外的尺寸紧凑的单人或双人的小型车）的磁场扰动和背景磁场比较接近，难以探测到的问题，还有部分停车位周围有建筑施工，地铁高铁等运行对磁场数据有一定的干扰，所以结合毫米波雷达技术可以很好的解决因为周围磁场干扰和变化微小而引起的漏检或误检问题，从而提高车辆检测准确率。
The static strength of the Earth's magnetic field is between 0.5 and 0.6 gauss, and the strength of the Earth's magnetic field is certain over a wide area (about a few kilometers). When a ferromagnetic object, such as a car, is placed in the magnetic field, it will cause magnetic field disturbance, and the magnetic resistance parking terminal placed near it can measure the change in the intensity of the geomagnetic field, so as to judge the existence of the vehicle. In practical application, it is found that there are some vehicles (minivans, some domestic models or new energy vehicles). The magnetic field disturbance of a compact single or two-person small car in foreign countries is relatively close to the background magnetic field, which is difficult to detect. In addition, there is construction around some parking Spaces, and the operation of subway and high-speed rail has certain interference with magnetic field data. Therefore, the combination of millimeter wave radar technology can effectively solve the problem of missing or false detection caused by the interference and small changes of the surrounding magnetic field. Thus improve the accuracy of vehicle detection.
