Precision Munition Guidance and Estimation of Target Position in 2-D

2016 ◽  
Author(s):  
S. Sreeja ◽  
Hari Hablani
Keyword(s):  
Target Position

Target position as a coding dimension.

1960 ◽  
Author(s):  
R. S. Nickerson ◽  
J. S. Duva
Keyword(s):  
Target Position

Investigations on the positioning accuracy of the Nano Fabrication Machine (NFM-100)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jaqueline Stauffenberg ◽  
Ingo Ortlepp ◽  
Ulrike Blumröder ◽  
Denis Dontsov ◽  
Christoph Schäffel ◽  
...  
Keyword(s):  
Target Position ◽  
Repeated Measurements ◽  
Scanning Probe ◽  
Measuring System ◽  
Direct Drive ◽  
Positioning Accuracy ◽  
Scanning Probe Lithography ◽  
Nano Fabrication ◽  
Atomic Force ◽  
Acceleration And Deceleration

Abstract This contribution deals with the analysis of the positioning accuracy of a new Nano Fabrication Machine. This machine uses a planar direct drive system and has a positioning range up to 100 mm in diameter. The positioning accuracy was investigated in different movement scenarios, including phases of acceleration and deceleration. Also, the target position error of certain movements at different positions of the machine slider is considered. Currently, the NFM-100 is equipped with a tip-based measuring system. This Atomic Force Microscope (AFM) uses self-actuating and self-sensing microcantilevers, which can be used also for Field-Emission-Scanning-Probe-Lithography (FESPL). This process is capable of fabricating structures in the range of nanometres. In combination with the NFM-100 and its positioning range, nanostructures can be analysed and written in a macroscopic range without any tool change. However, the focus in this article is on the measurement and positioning accuracy of the tip-based measuring system in combination with the NFM-100 and is verified by repeated measurements. Finally, a linescan, realised using both systems, is shown over a long range of motion of 30 mm.

Shoulder Joint Position Sense Can Be Reduced by Sensory Reference Frame Transformations

2021 ◽  
pp. 003151252199304
Author(s):  
David Phillips ◽  
Albena Zahariev ◽  
Andrew Karduna
Keyword(s):  
Reference Frame ◽  
Constant Error ◽  
Sensory Information ◽  
Target Position ◽  
Position Sense ◽  
Joint Position Sense ◽  
Joint Position ◽  
Multiple Sources ◽  
Directional Bias

Joint position sense (JPS) is commonly evaluated using an angle replication protocol with vision occluded. However, multiple sources of sensory information are integrated when moving limbs accurately, not just proprioception. The purpose of this study was to examine different availability of vision during an active JPS protocol at the shoulder. Specifically, the effects of four conditions of vision availability were examined for three target shoulder elevation angles (50°, 70° & 90°): vision occluded continuously (P-P); vision available continuously (VP-VP); vision occluded only during target memorization (P-VP); and vision occluded only during target position replication (VP-P). There were 18 participants ( M age = 21, SD = 1 years). We used separate repeated ANOVAs to examine the effect of condition and target angle on participants’ absolute error (AE, a measure of accuracy) and constant error (CE, a measure of directional bias). We found a significant main effect for condition and angle for both dependent variables ( p < 0.01), and follow-up analysis indicated that participants were most accurate in the VP-VP condition and least accurate in the P-VP condition. Further follow-up analysis showed that accuracy improved with higher target elevation angles, consistent with previous research findings. Constant error results were similar, as there was a prominent tendency to overshoot the target. Unsurprisingly, participants performed best at the angle replication protocol with their eyes open. However, while accuracy was reduced when vision was occluded during target memorization, it was restored during target replication. This finding may have indicated an accuracy cost due to introduced noise when transforming sensory information from a proprioceptive reference frame into a visual reference frame.

scholarly journals Calibration Method of Array Errors for Wideband MIMO Imaging Radar Based on Multiple Prominent Targets

2021 ◽  
Vol 13 (15) ◽  
pp. 2997
Author(s):  
Zheng Zhao ◽  
Weiming Tian ◽  
Yunkai Deng ◽  
Cheng Hu ◽  
Tao Zeng
Keyword(s):  
Multiple Input Multiple Output ◽  
Estimation Method ◽  
Target Position ◽  
Position Estimation ◽  
Least Square ◽  
Antenna Structure ◽  
Imaging Radar ◽  
Position Errors ◽  
Calibration Methods ◽  
Array Errors

Wideband multiple-input-multiple-output (MIMO) imaging radar can achieve high-resolution imaging with a specific multi-antenna structure. However, its imaging performance is severely affected by the array errors, including the inter-channel errors and the position errors of all the transmitting and receiving elements (TEs/REs). Conventional calibration methods are suitable for the narrow-band signal model, and cannot separate the element position errors from the array errors. This paper proposes a method for estimating and compensating the array errors of wideband MIMO imaging radar based on multiple prominent targets. Firstly, a high-precision target position estimation method is proposed to acquire the prominent targets’ positions without other equipment. Secondly, the inter-channel amplitude and delay errors are estimated by solving an equation-constrained least square problem. After this, the element position errors are estimated with the genetic algorithm to eliminate the spatial-variant error phase. Finally, the feasibility and correctness of this method are validated with both simulated and experimental datasets.

Dependence of ZnO:Al properties on the substrate to target position in RF sputtering

2008 ◽  
Vol 516 (20) ◽  
pp. 7094-7097 ◽  
Author(s):  
F. Couzinié-Devy ◽  
N. Barreau ◽  
J. Kessler
Keyword(s):  
Rf Sputtering ◽  
Target Position

scholarly journals OC-0301: Target position uncertainty during visually guided breathhold radiotherapy in locally advanced NSCLC

2017 ◽  
Vol 123 ◽  
pp. S155-S156
Author(s):  
J. Scherman Rydhög ◽  
S. Riisgaard Mortensen ◽  
M. Josipovic ◽  
R. Irming Jølck ◽  
T. Andresen ◽  
...  
Keyword(s):  
Advanced Nsclc ◽  
Locally Advanced ◽  
Target Position ◽  
Visually Guided ◽  
Position Uncertainty ◽  
Locally Advanced Nsclc
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