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Data from three-way measurement is a kind of important observing data for deep space probes. By utilizing this data, this paper presents an algorithm to calculate the real-time position of deep space probes based on UKF (unscented Kalman Filter). The observing model and forecast method using the three-way measurement are given with the implementation method via dynamic modeling and non-dynamic modeling...
A real-time multi-mode robust filtering method is proposed for the large thrust and slow spin characteristics of the rocket above the flight stage. The rocket upper stage in the sliding section of the existence of slow spin characteristics, which will lead to ground measurement equipment tracking instability, poor measurement data quality. In order to solve this problem, the robustness theory and...
In this paper, a novel predictive smooth variable structure filter (PSVSF) is presented for attitude synchronization during satellite formation flying (SFF). The strategy is proposed based on variable structure control concept and applies to any nonlinear system with modeling errors. Because the modeling errors in the PSVSF are not restricted to Gaussian noise only, the technique can deal with various...
The control system with fast response speed, high precision of tracking error, and high robust performance is still a kernel technology of Attitude Control System (ACS) of spacecraft, which directly affects the whole performance of spacecraft. Hence, a non-singular Terminal adaptive fuzzy sliding-mode controller is designed to come true the high precision and high performance control. The theory of...
Ultrasonic flow meter which provides non-invasive no-moving-parts construction is one of the fasted-growing technologies in flow gauging. Based on the general elasticity theory, this paper investigates sound wave propagation in elastic solid, as well as the mathematical description of ultrasonic transducer with the help of electric-acoustic analysis. Moreover, wave phenomenon in moving fluid is introduced...
The technology of high precision attitude determination with low precision sensors based on data fusion is the objective requirement of modern small satellite. This paper presents a new attitude determination algorithm termed Pre-process EKF(PP-EKF) based on preprocess of sensor data. It can enhance the overall modeling accuracy by using the quadratic penalty function to correct the kinematics model...
It is necessary to adopt effective data fusion method to improve the data efficiency and the accuracy of attitude determination, due to the sensors of low accuracy and low power dissipation is often used in attitude determination with the limitation of scientific research funding and power restriction. A new micro satellite attitude determination algorithm based on fusing-feedback federal filtering...
A model of two-echelon inventory system consisting of a warehouse and a distributor with periodic-review and with stochastic demand as well as stochastic return is considered, where the distributor must order either none or at least as much as a minimum order quantity in each time period. First, a simple heuristic policy (s,t) is studied and it is specified by only two parameters s and t, which determine...
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