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光链路是无线局域网安全性的物理层解决方案,其中上行链路为便携式终端设备设计的LD发射光束对准是关键问题之一。在Windows平台上展示了一种自动对准的软硬件控制方法,利用Windows中的Direct Show函数库,对激光光斑与目标的对准情况进行视频信号采集和图像识别,为简化识别算法,以蓝色为特征颜色并以一个特定的形状来标识对准目标,以650 nm红色LD为识别导向光束。使之位于红外传输光束中心位置左右,通过识别LD红色光斑与蓝色目标并判断它们之间偏差的方位和距离,将数据输出到下位机控制的微型云台,在二维方位上校准光斑与目标的偏差,同时通过红外LD实现了发送端到接收目标的光信号传输。
Optical links are physical layer solutions for wireless LAN security. Uplink beam alignment of LDs designed for portable terminal equipment is one of the key issues. On the Windows platform, an automatic alignment software and hardware control method is demonstrated. By using the Direct Show function library in Windows, video signal acquisition and image recognition are performed on the alignment of the laser spot and the target. In order to simplify the identification algorithm, The color is the characteristic color and identifies the alignment target in a specific shape, with the 650 nm red LD as the identification guide beam. So that it is located in the center of the infrared transmission beam around the position by identifying the LD red spot and the blue target and determine the deviation between the azimuth and distance of the data output to the lower computer-controlled micro-PTZ, the two-dimensional azimuth calibration spot and Target deviation, at the same time through the infrared LD to achieve the sender to receive the target optical signal transmission.