In order to obtain the highest accuracy of calibration, this paper deduces the criterion of selecting calibration force and proposes the new concept of relative interference matrix of sensors.

Digital image watermark algorithm based on Hermit matrix perturbation;

This improved method gets covariance matrix with recursion algorithm and computes the eigenvalues and eigenvectors of the covariance matrix with matrix perturbation theory.

The inverse problem in geodesy is not always a well posed problem because of the insufficiencies of observations or the lack of knowledge about the investigated system,the ill-conditioned problem is investigated based on the matrix perturbation theory.

This paper starts from the point of airborne SAR,studies the signal form of the deceptive scene jamming,as well as the generation of the deceptive signal,then studies several key factors necessary for implementation,discusses the configuration of jammers and the effects of the location error of radar,solves several possible problems within implementation.

Influence of outer gimbal disturbance torque on testing precision of PIGA;

In the airhovered turntable with the slip ring servo system driven by AC motor,the disturbance torque to the main shaft from the slip ring servo system is the most importnt.

In this paper various physical characteristics of disturbance torques exerted on the optical electronic stabilization/tracking platform are analyzed and investigated.