中国科学院机构知识库网格系统: 检索

Disciplining a Rubidium Atomic Clock Based on Adaptive Kalman Filter 期刊论文 OAI收割
SENSORS, 2024, 卷号: 24, 期号: 14, 页码: 17
作者: Liu, Kun; Guan, Xiaolong; Ren, Xiaoqian; Wu, Jianfeng

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收藏 | 浏览/下载：19/0 | 提交时间：2025/04/03

adaptive Kalman filter rubidium atomic clock autocovariance least squares time and frequency Allan deviation

On the Small Time Asymptotics of the Dynamical Phi(4)(1) Model 期刊论文 OAI收割
ACTA MATHEMATICA SINICA-ENGLISH SERIES, 2020, 页码: 11
作者: Chen, Bing Guang; Zhu, Xiang Chan

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收藏 | 浏览/下载：30/0 | 提交时间：2021/01/14

Phi(4)(1) model space-time white noise small time asymptotics large deviation

Avalanche photodiode single-photon detector with high time stability 期刊论文 OAI收割
ACTA PHYSICA SINICA, 2020, 卷号: 69, 期号: 7, 页码: 6
作者: Zhang Hai-Yan; Wang Lin-Li; Wu Chen-Yi; Wang Yu-Rong; Yang Lei

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收藏 | 浏览/下载：25/0 | 提交时间：2021/12/06

single-photon detection avalanche photodiode time deviation delay drift

Influence of the Substrate Orientation on the Isothermal Solidification during TLP Bonding Single Crystal Superalloys 期刊论文 OAI收割
Journal of Materials Science & Technology, 2014, 卷号: 30, 期号: 3, 页码: 213-216
N. C. Sheng; B. Li; J. D. Liu; T. Jin; X. F. Sun; Z. Q. Hu

收藏 | 浏览/下载：22/0 | 提交时间：2014/04/18

Transient liquid phase (TLP) bonding Single crystal superalloys Orientation deviation Bonding time transient system

ERROR ASSESSMENT IN MODELING WITH FRACTAL BROWNIAN MOTIONS 期刊论文 OAI收割
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY, 2013, 卷号: 21, 期号: 3-4
作者: Qiao, Bingqiang; Liu, Siming

收藏 | 浏览/下载：27/0 | 提交时间：2016/09/23

Fractal Brownian Motion Error Assessment Hurst Exponent Standard Deviation Time Series

The aircraft autopilot design of parameters changing in a wide range (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Zhen D.; Yue Z.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

Autopilot is an important part of aircraft Under the action of the disturbance torque for the flight parameters of aircraft Changing in a wide range the range was about 16km on the basic of analyzing the typical trajectory the max height was about 5100m the trajectory of feature points were selected the deviation of lateral was about 12m taking pitch control loop for example the maximum angle of attack was about 3.6 a sub- PID autopilot was designed using classical control theory the maximum elevator deflection was less than 5 using single-mode Transient suppression method the maximum aileron deflection was less than 2 the overload due to control surface transition deflection was avoided when control parameters changing the maximum roll was less than 5 the verification was done by non-linear simulation. The result showed that: the phase margin of autopilot was greater than 30 the response of overload can accurately track the given overload instruction. An autopilot design method of aircraft of parameter changes in a wide range was provided. 2011 IEEE. the bandwidth was more than 14rad / s the settling time was less than 0.7s the maximum overshoot was 23.3%

A matching algorithm on statistical properties of Harris corner (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Information and Automation, ICIA 2011, June 6, 2011 - June 8, 2011, Shenzhen, China
作者: He B.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

The fundamental goal of target recognition and video tracking is to match target template with source image. Most matching methods are based on image intensity or multi-feature points. And the latter method is more popular for its high accuracy and small calculation. Image Registration Based on Feature Points focus on effective feature extraction of image points and paradigm. Harris corner in the image rotation gray noise and viewpoint change conditions has an ideal match results is more recent application of one feature point. This paper extract the Harris corner deviation and covariance firstly experiments show that the two features exclusive then applied them to image registration for the first time. A set of actual images have shown this proposed method not only overcomes the complicated background gray uneven distribution problems but also pan and zoom the image has a good resistance. 2011 IEEE.

The ship-borne infrared searching and tracking system based on the inertial platform (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Li Y.; Zhang H.; Zhang H.; Li Y.; Li Y.

收藏 | 浏览/下载：42/0 | 提交时间：2013/03/25

As a result of the radar system got interferenced or in the state of half silent it can cause the guided precision drop badly In the modern electronic warfare therefore it can lead to the equipment depended on electronic guidance cannot strike the incoming goals exactly. It will need to rely on optoelectronic devices to make up for its shortcomings but when interference is in the process of radar leading especially the electro-optical equipment is influenced by the roll pitch and yaw rotation it can affect the target appear outside of the field of optoelectronic devices for a long time so the infrared optoelectronic equipment can not exert the superiority and also it cannot get across weapon-control system "reverse bring" missile against incoming goals. So the conventional ship-borne infrared system unable to track the target of incoming quickly the ability of optoelectronic rivalry declines heavily.Here we provide a brand new controlling algorithm for the semi-automatic searching and infrared tracking based on inertial navigation platform. Now it is applying well in our XX infrared optoelectronic searching and tracking system. The algorithm is mainly divided into two steps: The artificial mode turns into auto-searching when the deviation of guide exceeds the current scene under the course of leading for radar.When the threshold value of the image picked-up is satisfied by the contrast of the target in the searching scene the speed computed by using the CA model Least Square Method feeds back to the speed loop. And then combine the infrared information to accomplish the closed-loop control of the infrared optoelectronic system tracking. The algorithm is verified via experiment. Target capturing distance is 22.3 kilometers on the great lead deviation by using the algorithm. But without using the algorithm the capturing distance declines 12 kilometers. The algorithm advances the ability of infrared optoelectronic rivalry and declines the target capturing time by using semi-automatic searching and reliable capturing-tracking when the lead deviation of the radar is great. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Spatial distribution characteristics of geomagnetic Z component phase variation in Chinese mainland 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2009, 卷号: 52, 期号: 4, 页码: 1033-1040
作者: Wang Ya-Li; Wu Ying-Yan; Lu Jun; Yu Su-Rong; Li Ming-Xiao

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收藏 | 浏览/下载：25/0 | 提交时间：2018/09/26

Phase variation Spatial distribution Geomagnetic "low-point" time Expected value Standard deviation

Method for recovering dynamic position of photoelectric encoder (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Sun Y.; Liu Y.-S.; Liang L.-H.; Sun Y.; Wan Q.-H.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

This paper presents a method to recover dynamic position of photoelectric encoder. While working at dynamic state original outputs of the photoelectric encoder are in theory two sine or triangular signals with a phase difference of /2. However there are still deviations of actual output signals. Interpolating on the basis of this deviation signal will result in interpolation errors. In dynamic state true original signal data obtained by data acquisition system is a time equation. Through processing these data by data equiangular and harmonic analysis the equation will be converted from time domain to position domain and an original position equation can be formed. Then the interpolation errors also can be obtained. By this method the interpolation errors can be checked in dynamic state and it can also provide electric interpolation basis so that to improve dynamic interpolation precision of the encoder. Software simulation and experimental analysis all prove the method effective. This method is he basis in theory for precision checking and calibration in motion. 2009 SPIE.