| The radar motion platform is an important component of the performance simulation testing experiment of radar systems, which can make the radar antenna move according to the preset trajectory in order to realize the mechanical scanning motion of the radar antenna and the simulation function of the real working environment. The disadvantages of the traditional radar system which usually uses field test method are the high cost, long test cycle, extremely vulnerable to be restricted by the climate and environment, and unable to achieve some experiment conditions. The simulation testing experiment which adopting the semi-physical simulation technology gradually becomes a common technical mean in the radar system performance test, as the introduction of it not only ensures the authenticity of the test to a certain extent, but also reduces the test cost and test cycle greatly thus meeting the technical requirements of field application well. Because the radar motion platform is an important environment simulation equipment of the simulation test system, it is the decisive factor for the success of the simulation testing experiment. Only a safe and controllable radar motion platform can ensure the full use of the tactical performance of radars.To coordinate with the verification test of correlation algorithms for small size millimeter wave radar antennas, this thesis designs a pitching/rotating platform which is suitable for a variety of radar antennas. Among the multiple freedom degrees of the radar motion platform, the pitching motion and the rotating motion are the two most critical freedoms of the whole system as they are directly connected with radar antennas.Firstly, this thesis introduces the development course and the research status at home and abroad of turntable technology and semi-physical simulation technology. Under the guidance of the project requirements, a general scheme of the pitching/rotating platform is proposed combined with existing implementation methods and related theories. Meanwhile, the load uncertainty is taken into account, which is quite essential to design a common platform. Therefore, the modular design of the platform is carried out.Secondly, according to the structure form, the working characteristic and the using environment, the main loads of pitching/rotating platform which include frictional load, inertial load and wind load, are determined, then calculated and analyzed. Fatherly, discuss the changing tendency of each load when the platform’s working condition varies, and design the each component of the platform in detail.In addition, analyze the pointing accuracy of the pitching/rotating platform, and respectively calculate the static pointing error and the dynamic pointing error to verify whether the accuracy of the platform is in compliance with the requirement of using requirements. Through the finite element simulation, the static characteristics of the platform are analyzed, the central limit bearing capacity of the platform and the changing trend of the static characteristics of the platform under the action of eccentric loads are discussed and the conclusion that the strength and stiffness of the platform can meet the design requirements is drawn. According the modal analysis and harmonic response analysis, the natural frequency and vibration mode of the platform are obtained, as to determine the vibration characteristics of the platform to meet the design requirements.Finally, based on the original design, an improvement scheme about the platform structure is proposed. Further improve the platform’s safety and measurement accuracy in using by adding the travel switch and the angle measuring element. |
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