A voltage valley detection circuit for QR(quasi-resonant) flyback AC/DC controller is designed.

It is important to predict the productivity of wells accurately in the practice of exploiting of an oil field by means of prediction filter model (PEM) used in seismic exploration.

Inversive prediction filtering and operator extrapolation;

The prediction filtering method by least-square inversion in f-x-y domain has been put forward on the basis of detailed analysis for noise elimination using prediction filtering in f-x domain.

For the sake of improving S/N, we put forward anew method F-X domain prediction filtering in common offset gathers for noiseelimination using prediction.

Estimating satellite attitude with predictive filtering

To distinguish different faults,two kinds of residuals generated from only one decentralized predictive filter are used,because they have different sensitivities to component /actuator faults and sensor faults.

Predictive filtering based on minimum model error is introduced to realize real time identification of unknown perturbations and conquer influence of model error.

To satisfy the high accuracy of attitude determination for three-axis stabilized geostationary meteorological sat- ellite image navigation,a new approach combined gyro with star sensors is proposed,and a real-time algorithm for aiti- tude estimation combined predictive filter and extended Kalman filter is designed.