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浏览/检索结果: 共10条，第1-10条 帮助 限定条件 发表日期：2007     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Application of CMOS APS star tracker with large FOV in attitude and angular velocity determination (EI CONFERENCE) 会议论文 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：21/0  |  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.   Design of submarine noises detector based on USB-host 会议论文 7th International Symposium on Test Measurement, Beijing, PEOPLES R CHINA, AUG 05-08, 2007 作者:  Xiao Jun*;  Zheng Yan;  Liu Qing;  Mo Yimin 收藏  |  浏览/下载：11/0  |  提交时间：2019/12/04 low-frequency noise  data acquisition  data storage  USB-host   Design of a 3-5-GHz ultrawideband bifet mixer using 0.35-mu m SiGe bicmos technology 期刊论文 microwave and optical technology letters, 2007 Song Ruifeng; Liao Huailin; Huang Ru; Wang Yangyuan 收藏  |  浏览/下载：2/0  |  提交时间：2015/11/10 bipolar cascode with metal oxide semiconductor field effect  transistor (BiFET)  bipolar complementary metal oxide semiconductor (BiCMOS)  mixer  ultrawideband (UWB)  LOW-NOISE-AMPLIFIER   A low noise CMOS charge sensitive preamplifier for MEMS capacitive accelerometer readout 其他 2007-01-01 Chen, Jianghua; Ni, Xuewen; Mo, Bangxian 收藏  |  浏览/下载：3/0  |  提交时间：2015/11/10 analog integrated circuits  low noise  CMOS  MEMS accelerometer  charge sensitive preamplifier  readout circuit   Low-phase noise 3-42-Gzilchlc signal generation using high-order longitudinal modes of a coaxial loop cavity 期刊论文 microwave and optical technology letters, 2007 Wang, Xinyue; Wang, Ziyu 收藏  |  浏览/下载：1/0  |  提交时间：2015/11/12 coaxial loop cavity  low-phase noise generator  mm-wave source  high-order longitudinal modes   Negative-resistance, reflection-type bipolar frequency doubler 期刊论文 microwave and optical technology letters, 2007 Lau, Yeung-Fan; Xue, Quan; Chan, Chi-Hou; Xia, Ming-Yao 收藏  |  浏览/下载：2/0  |  提交时间：2015/11/12 firequency doubler  negative-resistance  phase noise  reflection gain  reflection-type  LOW-NOISE  AMPLIFIER  DESIGN   A 0.4-V low noise amplifier using forward body bias technology for 5 GHz application 期刊论文 ieee microwave and wireless components letters, 2007 Wu, Dake; Huang, Ru; Wong, Waisum; Wang, Yangyuan 收藏  |  浏览/下载：2/0  |  提交时间：2015/11/12 forward body bias  low noise amplifier (LNA)  low power  low voltage   Design of a 12GHz SiGe bipolar LNA 期刊论文 chinese journal of electronics, 2007 Song Ruifeng; Liao Huailin; Huang Ru; Wang Yangyuan 收藏  |  浏览/下载：2/0  |  提交时间：2015/11/13 BiCMOS (bipolar CMOS)  low noise amplifier (LNA)  12GHz   CMOS射频接收前端的设计与研究 学位论文 2007, 2007 张君玲 收藏  |  浏览/下载：4/0  |  提交时间：2016/02/14 射频接收  低噪声放大器  混频器  radio frequent receiver  low noise amplifier  mixer   A wide-band front-end for terrestrial and cable receptions 会议论文 topical meeting on silicon monolithic integrated circuits in rf systems, long beach, ca, jan 10-12, 2007 Gu, M (Gu, Ming); Ma, DS (Ma, Desheng); Mao, W (Mao, Wei); Yan, J (Yan, Jun); Shi, Y (Shi, Yin); Dai, FF (Dai, Fa Foster) 收藏  |  浏览/下载：99/12  |  提交时间：2010/03/29 BiCMOS  linearity  low noise amplifier  mixer  noise figure  SiGe  VCO  wide band