中国科学院机构知识库网格系统: 检索

Mathematical Derivation and Parameter Analysis of Phase-sensitive Detection Principle 会议论文 OAI收割
Virtual, Hangzhou, China, 2020-08-20
作者: Wang, Haisen; Wang, Rui; Qiao, Yongming; Lv, Tao; Yang, Lulu

|

收藏 | 浏览/下载：36/0 | 提交时间：2020/11/09

phase-sensitive detection weak signal highprecision detection

Effects of nonlinearity and technical noise on weak-value amplified phase measurement 期刊论文 OAI收割
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 2020, 卷号: 53, 期号: 12, 页码: 6
作者: Wu, Hao; Luo, Zheng-Chun; Xu, Li-Ping; Wu, Peng; Shi, Hao-Fei

|

收藏 | 浏览/下载：18/0 | 提交时间：2020/08/24

weak measurement phase estimation signal to noise

Orbit improvement for Chang'E-5T lunar returning probe with GNSS technique 期刊论文 OAI收割
ADVANCES IN SPACE RESEARCH, 2015, 卷号: 56, 期号: 11, 页码: 2473-2482
作者: Fan, Min; Hu, XiaoGong

收藏 | 浏览/下载：72/0 | 提交时间：2016/01/14

Chinese lunar exploration program Global navigation satellite system Weak signal acquisition and tracking performance Fusion processing of space- and ground-based data Accuracy of orbit determination and prediction

Post-selected von Neumann measurement with Hermite-Gaussian and Laguerre-Gaussian pointer states 期刊论文 OAI收割
NEW JOURNAL OF PHYSICS, 2015, 卷号: 17, 期号: 0, 页码: 83029
作者: Turek, Y; Kobayashi, H; Akutsu, T; Sun, CP; Shikano, Y

收藏 | 浏览/下载：35/0 | 提交时间：2016/11/21

von Neumann interaction quantum measurement weak measurement higher-order Gaussian mode signal-to-noise ratio weak-value amplification

A DIRECT EVALUATION OF MONO-COMPONENTS BY INSTANTANEOUS FREQUENCY 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF WAVELETS MULTIRESOLUTION AND INFORMATION PROCESSING, 2012, 卷号: 10, 期号: 3
作者: Niu, Kaifu; Peng, Lizhong; Peng, Silong

收藏 | 浏览/下载：35/0 | 提交时间：2015/08/12

Mono-component signal instantaneous frequency envelope offset of local extremum weak intrinsic mode function

Design and application of natural audio electric field frequency selecting instrument 会议论文 OAI收割
3rd International Conference on Precision Instrumentation and Measurement 2011, CPIM2011, Xiangtan, China, July 18, 2011 - July 21, 2011
Liao, Xiuying(廖秀英); Cheng, Hui; Bai, Yicheng

收藏 | 浏览/下载：35/0 | 提交时间：2012/05/18

Groundwater resources Instruments Measurements Mineral resources Software design System stability Design and application Electric field frequency Electrical structures Field works Geological bodies Geological information Hardware design Magnetotelluric soundings Observe system Weak signal detection

A hybrid median filter for enhancing dim small point targets and its fast implementation (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Multimedia and Signal Processing, CMSP 2011, May 14, 2011 - May 15, 2011, Guilin, Guangxi, China
Yang Q.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Weak stars and middle altitude orbit satellites or high altitude orbit satellites are presented as dim point targets in images of astronomical observation. They have low intensity and occupy few pixels in image. In most situations the background of sky is always ununiform and there exists pulse noises. Thus results in targets submerging in background noises and low signal noise ratio (SNR). Median filter is an effective method for removing pulse noise. But it can blur image after modifying gray of non-noise pixels when image has low SNR. A hybrid median filter algorithm is proposed to process low SNR dim point targets image. The newly proposed method can suppress the pulse noises also can increase target $SNR$ and does not add extra fake targets. The time complexity of median filter is O(N2)(N is the widow size) and is difficult to implement in hardware. For quasi real time application a fast implementation of our hybrid median filter is proposed to reduce the time complexity to O(N). Experimental results show that the newly proposed algorithm is superior to ordinary median filter and fast median filter by comparing visual effect and performance. 2011 IEEE.

Laser pulse coded signal frequency measuring device based on DSP and CPLD (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, May 24, 2011 - May 26, 2011, Beijing, China
作者: Zhang H.-B.; Wang T.-F.; Guo R.-H.; Li Y.; Li Y.

收藏 | 浏览/下载：44/0 | 提交时间：2013/03/25

Laser pulse code is an anti-jamming measures used in semi-active laser guided weapons. On account of the laser-guided signals adopting pulse coding mode and the weak signal processing it need complex calculations in the frequency measurement process according to the laser pulse code signal time correlation to meet the request in optoelectronic countermeasures in semi-active laser guided weapons. To ensure accurately completing frequency measurement in a short time it needed to carry out self-related process with the pulse arrival time series composed of pulse arrival time calculate the signal repetition period and then identify the letter type to achieve signal decoding from determining the time value number and rank number in a signal cycle by Using CPLD and DSP for signal processing chip designing a laser-guided signal frequency measurement in the pulse frequency measurement device improving the signal processing capability through the appropriate software algorithms. In this article we introduced the principle of frequency measurement of the device described the hardware components of the device the system works and software analyzed the impact of some system factors on the accuracy of the measurement. The experimental results indicated that this system improve the accuracy of the measurement under the premise of volume real-time anti-interference low power of the laser pulse frequency measuring device. The practicality of the design reliability has been demonstrated from the experimental point of view.

Space camera imaging gain in-orbit adjusting strategy (EI CONFERENCE) 会议论文 OAI收割
2009 2nd International Conference on Intelligent Computing Technology and Automation, ICICTA 2009, October 10, 2009 - October 11, 2009, Changsha, Hunan, China
作者: Wang J.; He X.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

A Multi-Step Gain Adjusting Strategy (MSGAS) of space camera was proposed which was used to get higher SNR (Signal-Noise Rate) image. When the space camera working in poor light condition the CCD signal was so weak that it's difficult to get a clear image to reduce the quantization noise and improve the SNR we must amplify the CCD signal first and then quantize. The MSGAS was achieved by adjusting the gain of the CCD (Charge Couple Device) signal processor step by step the upper limit and lower limit were set if the MDN (Mean Digital Number) of a fixed length image data was not between the lower and upper limit the gain was adjusted step by step. In the experiment the upper limit lower limit and the step were set and the result of the experiment showed that MSGAS was robust and SNR was improved from 28 to 39. 2009 IEEE.

Weak explosion signal detection by the Beijing metropolitan digital Seismic Network 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2009, 卷号: 52, 期号: 3, 页码: 681-690
Zhang, W; Chen, QF; Qiu, XL; Chen, Y

收藏 | 浏览/下载：51/0 | 提交时间：2011/07/03

Beijing metropolitan digital Seismic Network Explosion Noise Nuclear test Weak signal detection