机构

• 青藏高原研究所 [1]
• 长春光学精密机械与物... [1]
• 上海光学精密机械研究... [1]

采集方式

• OAI收割 [3]

内容类型

• 期刊论文 [2]
• 会议论文 [1]

发表日期

• 2011 [1]
• 2008 [1]
• 2007 [1]

学科主题

• 地理学::自然地理学 [1]
• 激光技术;激光物理与... [1]

筛选

浏览/检索结果: 共3条，第1-3条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Allometric models for leaf area estimation across different leaf-age groups of evergreen broadleaved trees in a subtropical forest 期刊论文  OAI收割 PHOTOSYNTHETICA, 2011, 卷号: 49, 期号: 2, 页码: 219-226 Zhang L (张林); Pan, L (Pan L.) 收藏  |  浏览/下载：17/0  |  提交时间：2012/05/10 LINEAR MEASUREMENTS  NONDESTRUCTIVE METHODS  WIDTH MEASUREMENT  L.  ACCURATE  REGRESSION  CITRUS  LENGTH   Accurate measurement of carrier-envelope phase drift for infrared femtosecond laser pulses 期刊论文  OAI收割 opt. express, 2008, 卷号: 16, 期号: 26, 页码: 21383, 21388 Song Liwei; Zhang Chunmei; Wang Jianliang; 冷雨欣; 李儒新 收藏  |  浏览/下载：803/79  |  提交时间：2009/09/18 Accurate measurements  Femtosecond pulses  Incident lasers  Incident pulses  Infrared femtosecond lasers  Interference fringes  Interference measurements  Measurement processes  Novel schemes  Phase drifts  Phase jitter  Second harmonics  Spectral interferences   Application of CMOS APS star tracker with large FOV in attitude and angular velocity determination (EI CONFERENCE) 会议论文  OAI收割 Advanced Sensor Systems and Applications III, November 12, 2007 - November 14, 2007, Beijing, China Lu D.; Guang J.; Shaoju W.; Tao C. 收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25 The paper deals with the spacecraft attitude determination problem using a new kind of star tracker with large FOV based on CMOS APS. Star tracker has been developed since 1970s and proved to be the most accurate sensor ever used in the spacecraft attitude determination systems. But the traditional CCD star tracker also has some disadvantages  such as small FOV  high power consumption  low sample rate and low working angular rate limit which prevent the use of CCD star tracker in attitude large angle maneuvering process. The new kind of star tracker based on CMOS APS has no such disadvantages and is more applicable on modern low-cost agile small satellites. Its higher sample rate and working angular rate limit over traditional CCD star tracker make it more adapt for spacecraft angular velocity determination. Because of the large FOV of the star tracker  the mathematical model of traditional CCD star tracker with a small FOV is not appropriate. So a new mathematical model was quoted to fit the star tracker with a large FOV. An alternative adaptive algorithm was also introduced in the paper. It can help the EKF algorithm work lacking of accurate covariance of the observation noise. An optimal estimation algorithm was used to estimate the angular velocity directly from the star tracker measurements. Mathematic simulation results indicate the CMOS APS star tracker can give accurate attitude information and estimated angular rate. The method can be used as the chief attitude determination system design of low-cost satellite without gyros  or be used as a backup strategy in the event of gyro failures to enhance the reliability of the attitude determination system.