Research and compensation on scheduling jitter of CNC operation system based on RTLinux

The authors present a time slot allocation algorithm based on minimal scheduling jitter in periodic tasks.

General-purpose microprocessors are increasingly being used for real-time control systems due to their excellent performance,but the uncertainty of instructions execution times introduced by their adopting architecture causes the problem of scheduling jitter that exists in real-time systems based on them.

New robust digital watermarking based on difference dither modulation;

Based on the strong security of chaos sequence, a novel watermark scrambling algorithm is proposed in this paper,and the parity of coding, decoding and error-correcting process are added into the original dither modulation algorithm.

In the algorithm,dither modulation is adopted,and the motion feature and texture feature are used as side information to determine the adaptive quantification step of every frame.

By utilizing the dithered modulation technique,the invisible watermark that can be blindly extracted is embedded in the DC.

In the area of Ring Laser Gyro(RLG) dither stripping,it is difficult to find a scheme that has nice real-time performance while keeping high accuracy,which limits the application range of RLG.

Effects of SINS design parameters on mechanical dither amplitude of ring laser gyroscope;