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长春光学精密机械与物... [3]
西安交通大学 [1]
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会议论文 [4]
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2011 [2]
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Three-sample rotation vector algorithm with angular rate input (EI CONFERENCE)
会议论文
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
Chu H.
;
Zhang Y.
;
Jia H.
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浏览/下载:17/0
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提交时间:2013/03/25
In order to research the attitude algorithm with angular rate input under the conical motion
a optimal threesample rotation vector algorithm based on single-step Newton backward interpolation is proposed. Using the principle of limited rigid body rotation and the characteristic of angular rate input
three-sample rotation vector algorithm is derivated. To minimum attitude errors
three-sample rotation vector algorithm is optimized. Three angular rate extraction methods of singlestep entire sample recursion
multi-step entire sample and singlestep Newton backward interpolation are proposed. Under the condition of conical motion with semi-cone angle 3 and angular frequency 2rad/s
simulation is done. The simulation results show that single-step Newton backward interpolation is superior to the other two methods
and its maximum error peak is 0.01
error drift rate is 0.036/h. Experiments in three-axis flying turntable with the same parameters are carried out
and the results show that error drift rates of three-channels are less than those of traditional quaternion
which are 13.53%
12.08% and 23.68% lower respectively. It also verified that the new algorithm can perform a high accuracy under the conical motion. 2011 IEEE.
The Research of real time auto-recognition of the moire fringe (EI CONFERENCE)
会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wang M.-J.
;
Wu Z.-G.
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浏览/下载:17/0
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提交时间:2013/03/25
Measuring the movement of raster by the method of moire fringe has the advantage of high sensitivity
high resolution and non-contacted measurement. The characteristic of moire fringe is that the image is white alternate with black
the angle of the stripes is uniform
the width of the stripes is uniform
the terminators of the stripes aren't clear. A fast method that can figure out the width and angle of the moire fringe precisely is put forward in this paper. It calculates the angle the stripes firstly. According to the principle of the minimum mean squared error (MMSE)
the closer a series of data is
the smaller the value of the MMSE will be. The method is described as follows: It takes the image's center as the origin
180 beelines pass through the origin with the same angle interval. it calculates the value of the minimum mean squared error of the 180 beelines and find out the least one among those
then the angle of the moire fringe comes out primarily. In order to improving the calculating precision of moire fringe
60 equal angles are divided in the neighborhood of the angle
then a precise angle of moire fringe is calculated according to the principle of the MMSE. After getting out the angle of the moire fringe
we begin to calculate the width of moire fringe. A line vertical with the moire fringe is drawn
and we can get the width of the moire fringe by the vertical line. In order to get over the influence of the noise
an effective area with the shape of diamond is selected in the image. The data of area is accumulated and projected according to the direction of moire fringe
and a sine curve come out. The width of moire fringe can be obtained by getting the position of the first wave crest
the position of the last wave crest and the number of wave crest. Experiments prove that the precision of the method put forward in this paper is enhanced in comparison with the traditional frequency method
the precision of width calculation achieves to 99.6% according to the evaluation indicators of width detection error. The computing speed is boosted largely compared with traditional method
and it can achieve with 15 ms
that satisfying the demand of real time. 2011 SPIE.
Research of Suitable Frequency Band of Transmission Line Model for Pilot Protection
会议论文
作者:
Fu, Xiping
;
Wu, Zhaozuo
;
Kang, Xiaoning
;
Suonan, Jiale
;
You, Hao
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浏览/下载:2/0
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提交时间:2019/12/10
angle-Frequency characteristic
suitable frequency band of model
pilot differential protection
parameter identification
Pi model
port impedance
Composite-structure frequency selective surface with tripole elements (EI CONFERENCE)
会议论文
8th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2008, November 2, 2008 - November 5, 2008, Kunming, China
Wang S.
;
Gao J.
;
Feng X.
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浏览/下载:65/0
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提交时间:2013/03/25
Two composite symmetry structure is proposed in this paper. Based on the integral equation method
the frequency response with large incident angle effect is analyzed. As a result of the numerical analysis
it is shown that the composite symmetry structure with single FSS screen is efficient to stabilize the drift of FSS resonant frequency with the steering of incident angle though transmission loss increased. Especially the structure that the FSS is embedded centrally in the dielectrics has better frequency characteristic with flat top and sharp skirts. The studies have indicated the versatility of the proposed structure. 2008 IEEE.
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