一种新的微型无人机数字图像无线传输系统

Novel Digital Image Wireless Transmission System for Micro Unmanned Air Vehicle

数字图像无线传输是微型无人机执行侦察、监视任务的重要组成部分。针对微型无人机的特点及其对图像传输的实时性要求,采用基于内嵌延拓5/3提升小波的改进SPECK图像压缩算法、基于Turbo码的信道纠错编码及扩频发射技术,提出一种新型数字图像无线传输系统。通过分析该系统的结构和原理,讨论了所涉及的关键技术及解决方案,就内嵌延拓5/3提升小波算法进行了硬件设计与仿真。结果表明,该结构算法简单、占硬件资源少、运算速度快、功耗低;所设计的系统压缩性能高、抗差错能力强及传输可靠,能满足微型无人机的特殊任务需求。

The digital image wireless transmission is an important component for special tasks of surveillance of micro unmanned air vehicle. According to the needs of micro unmanned air vehicle and the specific requirement for image transmission, a novel digital image wireless transmission system is proposed in this paper, which adopts the improved SPECK compression algorithm based on embedded extension 5/3 lifting wavelet transforms, channel error correction coding based on Turbo codes and spread spectrum technology. Its structure, principles, key technologies are discussed. The hardware architecture of embedded extension 5/3 lifting wavelet is designed and simulated. The results show that the algorithm is simple, the hardware requirement is low, the transform speed is high, with low power consumption; the designed system enjoys a high compressibility, the ability of resisting error and reliable transmission performance. Therefore, it is applicable for the specific tasks of micro unmanned air vehicle.