共查询到18条相似文献,搜索用时 468 毫秒
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针对资源勘探等高精度应用对航空重力仪测量精度和分辨率的更高要求,在前期研究基础之上,研发了新一代采用"捷联+平台"方案的新型航空重力仪。设计了采用石英挠性加速度计和光纤陀螺的捷联式重力仪,采用了新型温度控制方案,提高了重力仪的环境适应能力。设计了稳定平台,将捷联式重力仪保持在垂直方向,隔离载机的角运动干扰,减小了重力传感器的动态误差。飞行试验表明,该方案是有效的,将航空重力仪的精度和分辨率提升到优于1mGal/3km。 相似文献
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文章分析了影响石英挠性加速度计标度因数(K1)的长期稳定性的原因,讨论了一种将磁极片和磁钢的尺寸及磁钢材料进行改进的方法。并通过ANSYS大型有限元分析软件对改进的石英挠性加速度计的磁路进行了计算,获得了满意的结果。通过对结果的分析获得了对有关现象的直观深入的认识,为所计算加速度计的改进设计提供了线索。 相似文献
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以平台式航空/海洋重力仪为基础,为降低温度变化对其惯性器件尤其是重力敏感器的影响,保证重力测量的精度,设计了一种三级五路结构的高精度温度控制系统。以包含核心惯性器件的第三级温控为例,重点分析了温控对象的建模、非线性PI控制器的设计等问题,并进行了仿真分析和高低温环境下的试验验证,结果表明,在-10℃~+45℃温度范围内3个温控通道的温度变化量和温度稳定性均小于0.01℃,达到了重力仪的温度控制精度要求,为重力仪实现高精度重力测量提供了有利的温度条件。 相似文献
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This paper presents current accomplishments in the development of a high performance, high g, tactical accelerometer for use in the Advanced Kinetic Energy Missile (AdKEM) development program being conducted by the US Army Missile Command. The design goals of the accelerometer are to provide strapdown tactical navigation quality acceleration information throughout a 20 g soft launch phase, 1200 g boost phase, and low-g coast phase environment. The accelerometers must be able to provide acceleration measurements accurate enough to provide a navigational accuracy of 0.5 meter CEP at 500 meters. This translates to an accelerometer capable of measuring a 1200 g acceleration with a resolution of 1 milli-g. The AdKEM missile accelerometer and gyro outputs are used for control stability and midcourse guidance. The successful demonstration of this device offers a myriad of opportunities in both the commercial and military arenas. The operational environment and performance characteristics of the AdKEM accelerometer are presented. Crystalline quartz vibrating beam technology has been chosen for this accelerometer application to take advantage of solid state device characteristics. A solid state device with inherently digital output characteristics is desirable for strapdown navigation applications because of interface circuitry simplification, potential lower cost, inherent stability and longer storage life 相似文献
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重力梯度是重力位的二阶微分,对地球密度扰动具有更高的分辨率,能够更加精细、全面地反映重力位在空间上的变化。高精度重力梯度测量在地质调查、地球重力场测绘、惯性导航以及基础科学研究等方面发挥着重要作用。量子重力梯度仪是近年来快速发展的一种基于激光操控原子技术的新型高精度重力梯度测量设备,具有测量精度高、长期稳定性好等特点,尤其是对振动噪声具有良好的抑制效果。目前,量子重力梯度仪的最佳灵敏度可达4E/√Hz,与最先进的旋转加速度计式重力梯度仪灵敏度3E/√Hz的水平相当。本文介绍了量子重力梯度仪的基本原理和应用,并分析了其国内外研究现状,最后讨论了目前限制量子重力梯度仪灵敏度的主要因素以及未来发展方向。 相似文献
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Q-Flex quartz flexure suspension technology has evolved to produce a world class accelerometer with thousands of units delivered in 1991. The Sundstrand Model QA3000 Q-Flex design achieves a new level of inertial grade performance while maintaining a competitive market price. The specification for the QA3000, supported by actual performance data, depicts performance characteristics superior in both bias and scale factor. Long term measurements display bias and scale factor repeatability obtained across temperature over a period of three years. These data exhibit improved thermal behavior with reduced errors. Reaction time and radiation data highlight the performance of the hybrid position detector circuit 相似文献
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Microscope Instrument Development,Lessons for GOCE 总被引:2,自引:0,他引:2
Two space missions are presently under development with payload based on ultra-sensitive electrostatic accelerometers. The
GOCE mission takes advantage of a three axis gradiometer accommodated in a very stable thermal case on board a drag-free satellite
orbiting at a very low altitude of 250 km. This ESA mission will perform the very highly accurate mapping of the Earth gravity
field with a geographical resolution of 100 km. The MICROSCOPE mission is devoted to the test of the “Universality of free
fall” in view of the verification of the Einstein Equivalence Principle (EP) and of the search of a new interaction. The MICROSCOPE
instrument is composed of two pairs of differential electrostatic accelerometers and the accelerometer proof-masses are the
bodies of the EP test. The satellite is also a drag-free satellite exhibiting a fine attitude control and in a certain way,
each differential accelerometer is a one axis gradiometer with an arm of quite null length. The development of this instrument
much interests the definition and the evaluation of the sensor cores of the gradiometer. The in flight calibration process
of both instruments is also very similar. Lessons form these parallel developments are presented.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献