نتایج جستجو برای: precision positioning
تعداد نتایج: 155033 فیلتر نتایج به سال:
Positioning stages using piezoelectric stack actuator (PEA) have very high theoretical bandwidth and resolution. However, as the total length of travel increases, nonlinear dynamics due to inherent hysteresis starts to dominate. In this paper, we separate the fast and slow dynamics of the total displacement and propose a simple first-order model. By approximating the hysteresis mapping with sim...
Among a variety of actuators, Lorentz actuators are often used as fine actuators in DSA systems under an environment where disturbances are expected at fine actuators’ base. Their advantage is that they show an almost ideal zero stiffness characteristics, which is that disturbances from bases do not transmit to the moving parts [1]. Such zero-stiffness DSA systems have been applied to wafer sca...
This paper established strict image-object relationship model of ZY-3,and analyzed orbital data and attitude data statistically. It did camera geometric calibration using high-precision artificial target. Internal geometric correction of the original satellite images, eliminating the interior orientation parameters such as non-uniform transition, transition of the integration time and attitude ...
Precise GPS kinematic positioning in the post-processed or in the real-time mode is now increasingly used for many surveying and navigation applications on land, at sea and in the air. The distance from the mobile receiver to the nearest reference receiver may range from a few kilometres to hundreds of kilometres. As the receiver separation increases, the problems of accounting for distance-dep...
There are many challenging tasks in the design of the beamline instrumentation that relate to high precision positioning mechanism for users at a third-generation synchrotron radiation source, such as the 7 GeV Advanced Photon Source (APS). Over the last few years, progress has been made in the development of novel mechanisms with high positioning resolution and high stability at the APS. Appli...
The goal of the research described in this paper is the design of a GPS data processing technique capable of producing high-precision positioning results, regardless of platform dynamics, utilising only a single, high-quality receiver. This is accomplished by combining two processing philosophies: point positioning – making use of precise GPS constellation ephemeris and clock offset information...
We demonstrate a technique for the precise immobilization of nanoscale objects at accurate positions on two-dimensional surfaces. We have developed a water-based photoresist that causes nanostructures such as colloidal quantum dots to segregate to a thin layer at surfaces. By combining this material with electroosmotic feedback control, we demonstrate the ability to position selected, individua...
To realize dynamic positioning of the shearer, a new method based on SINS/WSN is studied in this paper. Firstly, the shearer movement model is built and running regularity of the shearer in coal mining face has been mastered. Secondly, as external calibration of SINS using GPS is infeasible in enclosed underground mine, WSN positioning strategy is proposed to eliminate accumulative error produc...
One of the major drivers for developing integrated navigation systems is the vision to provide first responders and healthcare providers, critical information where and when they need it. These integrated wireless devices of the future will assist the user with communications and incident management operations in the field in real time. The most important piece of such a system is clearly a abi...
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