Aiming at the shortage of the incremental encoder with simple process to change along the count "in the presence of repeatability and anti disturbance ability, combined with its application in a large project in the country, designed an electromechanical switch for generating zero, zero crossing signal. A mechanical zero electric and zero coordinate transformation model is given to meet the path optimality, single, fast and accurate requirements of adaptive fast change algorithm, the proposed algorithm can effectively solve the contradiction between the accuracy and the change of the time change. A test platform is built to verify the effectiveness and robustness of the proposed algorithm. The experimental data show that the effect of the algorithm accuracy is not influenced by the change of the speed of change, change the error of only 0.0013. Meet too fast, the change of system accuracy, and repeated experiments show that this algorithm has high robustness.
To support the planning of satellite orbit tracking and imaging experiment, and provide effective data for in-orbit test planning,the semi-physical simulation model of ground target tracking is established to simulate the target tracking process. First, this paper analyzes the typical work process of space target tracking system, established the spatial coordinates model of the space target LOS and satellite rendezvous process. Secondly, the mapping relationship between space target motion and tracking system is studied based on the principle of space radial motion principle. The semi-physical simulation’s design principle and the system design scheme of space tracking are given by establishing the radial motion model of the target motion and tracking system. Finally,based on the analysis of the typical space target motion and the design of the semi physical simulation system, the simulation of the space target tracking process with the intersection distance of 60km and the moving speed of 4.2km/s is carried out. The simulation results show that This system can realize continuous tracking of space targets,when the system is stable, the miss distance is less than 0.5 pixels, Azimuth tracking velocity stability is 0.0174°/s, the pitch tracking velocity stability is 0.0161°/s. The test shows that the design principle of the simulation system is correct, and the closed-loop control process can be simulated effectively. This test can provide effective data supports for program analysis and control methods on orbit test, real-time monitoring, analysis and test of synchronous control countermeasures of fault verification.
A kind of high accuracy Photo-electric auto-collimator based on PSD was designed. The integral structure composed of light source, optical lens group, Position Sensitive Detector (PSD) sensor, and its hardware and software processing system constituted. Telephoto objective optical type is chosen during the designing process, which effectively reduces the length, weight and volume of the optical system, as well as develops simulation-based design and analysis of the auto-collimator optical system. The technical indicators of auto-collimator presented by this paper are: measuring resolution less than 0.05″; a field of view is 2ω=0.4° × 0.4°; measuring range is ±5′; error of whole range measurement is less than 0.2″. Measuring distance is 10m, which are applicable to minor-angle precise measuring environment. Aberration analysis indicates that the MTF close to the diffraction limit, the spot in the spot diagram is much smaller than the Airy disk. The total length of the telephoto lens is only 450mm by the design of the optical machine structure optimization. The autocollimator’s dimension get compact obviously under the condition of the image quality is guaranteed.
Satellite simulated system is a very important sub system of satellite payload ground comprehensive testing system which tests the satellite payload’s order and telemetering before delivering the payload to satellite. For all kinds of satellite simulated system, a new implementation which used an improved Finite State Machine (FSM) model can make the whole system modules clear, reduce the coupling between modules, improve the modules’ reusability, enhance productivity, and make the research and development of the whole system easier. The engineering applications’ experimental results show that the implementation of an improved FSM model can make the satellite simulated system stable and reliable.
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