Two-dimension Distortion Measurement Of TDI CCD Camera Based On High-speed Data Transmission And Display System

Remote sensing technology is a detection technology arose in modern time. It’sone of the most important methods in resources exploration, topographic mapping,military reconnaissance, environmental monitoring etc.In aviation and aerospace remote sensing, the plane and satellite are used ascarriers, but it is the detection instruments that really matter in completing theassigned mission, they are called payload. The imaging technology graduallychanged a new direction, namely the imaging technique development based on CCDsince the appearance of CCD. Recently, film remote sensing cameras are largelyreplaced by cameras based on CCD space remote sensing, which officially becomethe mainstream of the space remote sensing cameras.CCD remote sensing camera can be divided into Linear Array CCD Push-broomcamera and Area Array CCD frame perspective camera according to the CCD types,Linear Array remote sensing camera is one type of remote sensing camera. It canmake the movement of photo induced charge keep the same velocity as imagingsurface projection. It is called Time Delay Exposure technology. TDI is one of thePlane Surface Array CCD Pattern. Nowadays It has been testified by theinternational space earth-observation that push-broom TDI CCD optical remotesensor can improve photoelectric sensitivity without damage the scene resolution inhigh-speed motion and improve the signal-to-noise ratio, making TDI competent for low contrast imaging. In addition, there is a great improvement on pixelresponse homogeneity and dark current homogeneity.Thanks to the adjustable traitof exposure transference time, push-broom TDI CCD sensor has became the bestone of earth-observation optical remote sensor.The distortion of imaging system can affected image quality precision. Ithinders the identification, analysis and judgment about the images, which impedesthe localization and analysis of observation target.This subject takes the development of a certain domestic model as background,focusing on the distortion measuring of push-broom space remote sensing cameras.Firstly, this paper analyses the current situation and technical background aboutpush-broom cameras and distortion measuring, then proposes an overall planaccording to FPGA and Camera Link high-speed data transmission system anddistortion measuring based on the TDI CCD plane surface array working mode.Secondly, this paper states the hardware design and software development abouthigh-speed data transmission system. Hardware design contains hardware selection,module function analyze, schematic diagram design and PCB design. Softwaredevelopment contains demand analysis and synchronous data dispose.Finally, this paper analyses the image that extracted, introduces the phenomenonof smear, then put forward an algorithm that fits this system, and remove smear’sphenomenon of distortion images.