Research Of Hybrid Transmission Method Of Multi-channel Telemetry Data Based On Image Hiding

As an important mean of research and development,Telemetry is often used in the development design and flight test for motion information of the aircraft and working state parameters of the internal components.Today,telemetry system includes telemetry data by ordinary sensors,and relatively intuitive image information obtained from image sensor.However,it brings problems of a large amount of image data and waste of channel resources caused by two kinds of data transmission.According to the above problem,hybrid transmission method of multi-channel telemetry data based on image hiding is discussed.For the problem of the conflict between the growth of remote sensing image data and the limited channel capacity,JPEG technique with the relatively simple operation and easy to implement is used to realize to the processing of image data.Based on the study of standard JPEG algorithm,considering problems of the compression rate is not high enough and the problem image quality is not good enough caused by fixed quantitative table in the compression process,and a method of adjusting adaptively quantization table according to the distribution of DCT frequency coefficient to optimize JPEG.Through the simulation,the optimized JPEG algorithm gets better compression performance under the condition of the same compression rate.For the problem of waste of channel resources caused by the transmission of telemetry data and image data,considering to use the channel of image data to transmit telemetry data,namely using the LSB image information hiding technology to realize the hybrid transmission of missile information(telemetry data and image data).Firstly,starting from the analysis of digital image bit plane,the standard time-domain LSB image hiding algorithm is proposed.Then,based on the JPEG image compression,the algorithm of hiding the telemetry data through the quantitative DCT coefficient in the compressed domain is put forward,and optimizing it based on the idea of matrix coding.The results show that the LSB optimization algorithm based on JPEG image has a better performance.Research has shown that hybrid transmission method of multi-channel telemetry data based on image hiding proposed by this paper saves the channel resources,reduces the complexity of the system,implements hybrid transmission of telemetry data,and ensures the recovery without distortion of telemetry data.