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Star trackers have been widely studied in the three past decades due to their high accuracies as well as, their capabilities in attitude determination as per 3 main axis in the real time. Star identification(star-ID) algorithms are of the most effective software parts in the devices of aid navigation in the performance of star trackers. In this research presents a star-ID algorithm which has four...
The singular values are important invariant features in singular value decomposition (SVD) method for autonomous star identification. This paper theoretically analyzes the inherent relationship between the star vectors in field of view (FOV) and the eigenvalues of the Hermitian matrix formed by star vectors, which is performed as an equivalent study on singular values of the star vector matrix. Firstly,...
Real-time Aerial Monitoring System performs the rapid mapping in an emergency situation so that the geoinformation could be constructed in near real time. In this system, the position/attitude information from GPS/IMU is used to perform the aerial triangulation (AT) without GCPs. The problem here is that the exterior orientation from AT highly depend on the performance of IMU. In this case, we could...
Aiming at the incomplete use of sensor information and complicated solving procedure in traditional combination attitude determination method for the spin-stabilized satellite, a new approach based on the blind signal separation algorithm was proposed. By analyzing the traditional attitude determination method and utilizing the attitude characteristics of the geosynchronous spin-stabilized satellite,...
In this paper, a new iterative algorithm for determination of direction cosine matrix (DCM) is presented, it can be expressed as two forms, matrix exponential and six scalar differential equations respectively, corresponding to each form, related algorithms used for the orthonormalization are derived, although the simulations and algorithm analysis are omitted here, the Van test results verified its...
GPS attitude determination is a key technology in aerospace, sailing and land-navigation etc. In the method of double difference phase measurement, it is a crucial topic to solve the carrier phase integer ambiguity, which is shown to be a combination optimization problem, and thus efficient heuristic algorithms are needed. In this paper, we propose a Discrete Particle Swarm Optimization (DPSO)-based...
Attitude determination with navigation satellites is a key technology in aviation, marine and land navigation. In the method based on carrier phase difference, the double difference integer ambiguity solving is important and difficult. This paper adopts Discrete Particle Swarm Optimization to search for the optimal integer ambiguity directly without the decorrelation of ambiguity, and calculates the...
This article presents the details of a new 3-axis simulator for spacecraft attitude control research and simulation. The air bearing allows the test bed to rotate about three axes with tiny friction. The attitude determination system consists of three fibre optical gyros, an inclinometer and a magnetometer. The actuator of the system consists of three reaction flywheels and four control moment gyros...
In this paper we present a low cost fault-tolerant attitude determination system to a scientific satellite using COTS devices. We related our experience in developing the attitude determination system, where we combine proven fault tolerance techniques to protect the whole system composed only by COTS from the effects produced by transient faults. We detailed the failure cases and the detection, reconfiguration...
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