Research On Airborne Imaging System Based On High Resolution Area-array Camera And Hyperspectral Imager

The number of spectral channels of the hyperspectral imager can reach dozens to hundreds,which can provide details of the target radiation spectral distribution in the working band.In the field of target detection,although hyperspectral imagers can carry out spectral detection of one or more pixel point targets with high spectral resolution,it is difficult to realize fast and accurate target recognition without the prior spectral information of the target or the geometric information with high spatial resolution.In addition,when the sensor is determined,the high spatial resolution of the hyperspectral imager and the hyperspectral resolution of the hyperspectral imager are mutually restricted and cannot be improved simultaneously.Therefore,the paper is oriented to the application requirements of target detection and recognition in complex environment.Therefore,this paper designed and developed a set of airborne imaging system based on high-resolution array camera and hyperspectral imager,aiming at target detection and recognition applications,which can achieve both spectral and spatial high-resolution detection.The main research contents and innovation points of the project are as follows.(1)In this paper,the overall technical route of combining hyperspectral anomaly detection with high-spatial image recognition is proposed,and design the light and small high-spatial and hyperspectral image integration system,and complete the development of the high-integration principle prototype,which provides an important means for obtaining hyperspectral and high-spatial resolution data based on the UAV platform.(2)In this paper,the key technology of USB3.0(universal serial bus 3.0)high-speed adjustable synchronous transmission system is presented.The design of USB3.0 peripheral controller using synchronous FIFO(First in First Out),automatic DMA(Direct Memory Access)and data block quantitative timing transmission is presented.It avoids the frame loss problem of UVC(USB video class)protocol and solves the problem that the bandwidth can not be stable when USB3.0 adopts bulk transfer mode.Compared with asynchronous FIFO and manual DMA transfer mode,it achieves the highest data transmission bandwidth of 159 Mbps and improves the stable transmission rate of USB3.0.(3)In this paper,a high-speed data acquisition scheme based on single-board computer with multiple USB3.0 interfaces is proposed,which solves the problems of high frame frequency and large data volume of high-resolution hyperspectral camera.Two hyperspectral detectors and an area-array panchromatic detector are realized for stable data acquisition in total of 360 MBps,among which the visible near infrared(VNIR)camera has a frame frequency of 200Hz(data rate of 100MBps).The shortwave infrared(SWIR)camera has a frame rate of 100Hz(data rate of 10MBps)and panchromatic cameras have a frame rate of 4Hz(data rate of 250MBps).(4)Airborne flight experiments were carried out,and the system worked normally.At the same time,hyperspectral image data and high spatial resolution camera data of ground object targets were obtained,which verified the effectiveness of the combination of hyperspectral imager and high resolution area-array camera to achieve ground object anomaly detection and image recognition scheme.