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随着无人机的普及,其应用场合和领域愈加广泛。在不同的应用场合下,无人机需要搭载不同的载荷来完成相应的任务。目前,无人机遥测图像采集和传输无疑是需求最多的一种功能,在航拍、侦查、物探等领域都存在这方面的应用。传统的无人机与地面之间传输图像以模拟图像为主,但模拟图像往往传输距离有限而且极易受到干扰,画面质量不稳定。以数字信号为载体进行图像传输已发展成为无人机图像传输的主要方式。数字信号传输速率受制于带宽,在带宽一定的情况下将原始图像压缩为H.264格式的图像能够有效的提升图像传输的帧频。
With the popularity of UAVs, their applications and fields become more widespread. In different applications, UAVs need to carry different loads to accomplish the corresponding tasks. At present, UAV telemetry image acquisition and transmission is undoubtedly the most demand-driven function, which has applications in aerial photography, reconnaissance and geophysical prospecting. Traditional UAVs and the ground to transfer images to simulate the image-based, but the simulation images are often limited transmission distance and highly susceptible to interference, the picture quality is not stable. Image transmission with digital signal as the carrier has developed into the main way of UAV image transmission. The digital signal transmission rate is limited by the bandwidth. When the bandwidth is fixed, the original image is compressed into an H.264 format image, which can effectively enhance the frame rate of the image transmission.