Research On Data Security Based On Dyson Hyperspectral Imager

Airborne hyperspectral imaging technology has extremely high application values and urgent requirements in military,material identification,environmental monitoring and many other fields.The secure storage of hyperspectral data provided the basis of such applications.Focusing on the problems with existing spectral measurement technologies,low sensitivity,narrow spectral range and hidden safety hazards in the secure storage of spectral data,this paper probed deep into spectral imaging and spectral data storage and transmission technologies;In view of the deficiencies of existing systems,it designed of a new spectrometer and its spectral data transmission and storage system,and performed related theoretical research,experimental simulations and research design work on this basis.The specific results are as follows:1.Based on the theoretical calculation of Dyson concentric optics,the aberration curve,field curve and distortion curve of Dyson spectral imager were simulated,and a new Dyson hyperspectral imager based on an airborne platform was designed;after that,it provided optimization design for the optical system of the spectrometer,conducted the design,manufacture and model selection of the key components of the hyperspectral instrument（such as slits,telescope components,spectral imaging components and detectors）,and optimized the design of the entire machine.The spectral resolution of the designed imaging spectrometer was better than 2nm,the color distortion was less than 5 m,the curve of the spectral line was better than 0.2%,and the distortion of the field of view was less than 0.37%.The experimental results showed that the spectral resolution of the prototype of the new Dyson hyperspectral imager had reached the international level.At a flying height of3,000m,it had a spatial resolution of 1.2m,a scanning width of above 30m,a color distortion of better than 5μm,and a line bending of better than 0.2%.In termed of the spectral index,when the spectral range of the prototype was set to the visible near-infrared spectral range of 450-850nm,its spectral resolving power was superior to 2nm;in terms of appearance indexes,the new spectrometer had a volume no larger than 150×150×300mm³,and an overall mass of less than 2kg.In the field experiment,when Transport-5 aircraft was used as a flight platform for the outfield experiment,the flight speed was 150km/h and the flying height was 1,500m.This paper also obtained the hyperspectral imaging data on surface vegetation,villages,roads,and village house roofs.The experimental results showed that,compared with traditional equipment,the new Dyson hyperspectral imager prototype not only had the advantages of small size,light weight,low power consumption and so forth,but also was designed with the functions of shaking base alignment,automatic zero-speed correction,parameter self-calibration,etc.2.This paper proposed the off-chip secure storage mechanism of hyperspectral data.The traditional off-chip storage technology was almost inapplicable to the infrared hyperspectral data storage of the system designed by this paper,not to mention the high cost and high power consumption.This paper put forward a new secure storage mechanism to ensure better data confidentiality and completion,as well as low memory consumption and low cost.The new mechanism protected data confidentiality through the BASC-AES-TS（Binary Additive Sequence Ciphers AES timestamp）structure design based on circuit and address scrambling of the Benes network,and protected data integrity through the integrity detection module based on SHA3-TAH and MSET-XOR-Hash tree structures.It designed hardware circuit in a 40nm process,with an experimental area of approximately 1.1mm².Experimental results showed that the hardware implementation frequency was 563 MHz,and that storage consumption was limited to 26.6%,slightly higher than HHS（storage consumption is 24.6%）and about half of the storage consumption of security storage strategies other than HHS;attack complexity（security level）reaches 2²²⁴,far higher than that of existing off-chip memory attack 2¹⁶⁰;in the comparison between read and write address delay and AES（Advanced Encryption Standard,delay are 50 clock cycles）,read and write address delays were 56 clock cycles（+6）and 42 clock cycles（-8 respectively）ms.Compared with other encryption methods,it has an obvious speed advantage,For example,the HHS read and write delay is 112 clock cycles and119 clock cycles,respectively.3.This paper designed a QPSK modulation technology-based digital transmitter for direct light intensity laser modulation.In the 1550nm spectrum segment,when the signal transmission rate was 80Gsamples/s,the labview software was used to process the sampled signal,which was used to modulate cryptographic SoC system to generate encrypted signal,analyze signal spectrum characteristics,and verify the feasibility of the security strategy designed in this paper.Simulation experiments on the system show that,at the signal transmission rates of 1Gsamples/s and10Gsamples/s,the system can also clearly display the constellation diagram,so as to intuitively described the amplitude and phase of the QPSK signal.