中国科学院机构知识库网格系统: 检索

Method for Estimating the Optimal Coefficient of L1C/B1C Signal Correlator Joint Receiving 期刊论文 OAI收割
REMOTE SENSING, 2022, 卷号: 14, 期号: 6, 页码: 21
作者: Guo, Yao; Zou, Decai; Wang, Xue; Rao, Yongnan; Shang, Peng

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收藏 | 浏览/下载：38/0 | 提交时间：2022/08/15

GNSS MBOC correlator joint receiving B1C L1C high precision positioning combination coefficient

北斗系统QMBOC信号无模糊多径抑制算法研究1 期刊论文 OAI收割
时间频率学报, 2020, 卷号: 43, 期号: 2, 页码: 153
作者: 王森; 王雪; 霍翔; 饶永南; 陈校非

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收藏 | 浏览/下载：51/0 | 提交时间：2021/11/29

BDS quadrature multiplexed binary offset carrier (QMBOC) signal Bump-Jump dual estimate technology (DET) narrow correlator technology high resolution correlator (HRC) unambiguous tracking multipath mitigation BDS正交复用二进制偏移载波(QMBOC)信号 Bump-Jump 双重估计(DET) 窄相关技术高分辨率相关器(HRC) 无模糊跟踪多径抑制

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收藏 | 浏览/下载：28/0 | 提交时间：2021/11/29

distributed FX correlator (DiFX) interferometry geostationary earth orbit 分布式FX相关机干涉测量地球同步轨道

Improved method of target detection on optoelectronic hybrid joint transform correlator in cluttered scences (EI CONFERENCE) 会议论文 OAI收割
2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China
作者: Yang L.; Yang L.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

A classical joint transform correlator (JTC) usually yields large correlation sidelobes as well as a large correlation peak width strong zero-order peak and low diffraction efficiency which make the detection ability of JTC lower. To overcome these difficulties firstly a joint power spectrum (JPS) subtraction technique in Fourier plane was proposed where reference image power spectrum and object image power spectrum are subtracted from the JPS before inverse Fourier-transform operation it is obvious that the modified JPS removes the zero-order term. Secondly a fringe-adjusted filter (FAF) was presented to suppress sidelobes and noises. The modified JPS is multiplied by a FAF before the inverse Fourier-transform operation to obtain the cross-correlation peak. Computer simulations demonstrated the improved method can obviously remove zero-order diffraction and effectively suppress the sidelobes and noises compared with classic JTC and then improve the detection ability for JTC. Experimental results presented the sharp correlation peak and also confirmed the method effectiveness. (2012) Trans Tech Publications Switzerland.

CALIBRATION AND ERROR ANALYSIS OF A KA-BAND FULLY POLARIMETRIC RADIOMETER BUILT WITH WIDEBAND MICROSTRIP CORRELATOR 会议论文 OAI收割
IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Vancouver, CANADA, JUL 24-29, 2011
作者: Wang, Xinbiao; Li, Jing; Jiang, Jingshan

收藏 | 浏览/下载：33/0 | 提交时间：2014/12/15

Fully polarimetric radiometer microstrip correlator calibration error analysis uncertainty

Method of improving the accuracy of image motion measurement for panoramic aerial cameras (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, April 26, 2010 - April 29, 2010, Dalian, China
作者: Jia P.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

To improve the accuracy of image motion measurement for panoramic aerial cameras the paper proposed a method of real-time image motion measurement based on 2D spatial correlation. An auxiliary area CCD is positioned paralleled to the main linear TDI CCD in the focal plane of the camera. For every frame of the image sequence taken by the auxiliary CCD a prediction on the displacement of the current image in the flight direction is made based on the forward image motion velocity. The current and the reference images are combined together for 2D-correlation which products an image motion vector. By decomposing the vector both the forward and pendulum-swing image motions can be determined. The demanding computational requirements for the real-time 2D-correlation are covered by a joint transform optical correlator. Simulation test results show that the accuracy is improved and the measurement error is within 0.2 pixels for input images with SNR=1 dB. 2010 Copyright SPIE - The International Society for Optical Engineering.

Panoramic aerial camera image motion measurement using a hybrid system (EI CONFERENCE) 会议论文 OAI收割
2010 3rd IEEE International Conference on Computer Science and Information Technology, ICCSIT 2010, July 9, 2010 - July 11, 2010, Chengdu, China
作者: Jia P.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

Image motion compensation is significantly important for aerial camera photograph. To execute the compensation we must determine the image motion exactly. This paper proposes a method of real-time image motion measurement for panoramic aerial cameras based on image processing using a hybrid system. Two cameras are simultaneously used in the hybrid system. One main linear CCD for imaging while the other auxiliary low resolution high frame rate area CCD for determining the image motion based on 2D spatial correlation. The demanding computational requirements for the real-time 2D spatial correlation are covered by a joint transform optical correlator. Simulation test results show that the accuracy is improved and the measurement error is within 0.2 pixels for input images with SNR=1 dB. 2010 IEEE.

Joint transform correlator based on joint image feature extraction using swarm intelligence method (EI CONFERENCE) 会议论文 OAI收割
2009 IEEE International Conference on Mechatronics and Automation, ICMA 2009, August 9, 2009 - August 12, 2009, Changchun, China
作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：15/0 | 提交时间：2013/03/25

An image feature extraction method based on Swarm Intelligence is used in the preprocessing of joint image in joint transform correlator. The Swarm Intelligence based image processing method is superior to the conventional image processing method in its robust flexible fault tolerant scalable and highly parallelizable characteristic. The output results from the classical JTC without image preprocessing and the JTC with Sobel operator based joint image feature extraction are compared with that of the JTC when using the Swarm Intelligence to extract the feature of joint image. Experiment results show the performance improvement of JTC using the feature extraction method based on Swarm Intelligence. 2009 IEEE.

Input plane preprocessing of joint transform correlator based on Swarm Intelligence (EI CONFERENCE) 会议论文 OAI收割
2009 2nd International Congress on Image and Signal Processing, CISP'09, October 17, 2009 - October 19, 2009, Tianjin, China
Yong W.; Ming Z.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Input plane image preprocessing can improve the performance of Joint Transform Correlator(JTC). Swarm Intelligence based image processing method is consistent with the parallel characteristic of optical signal processing method. In this paper A Swarm Intelligence based input plane preprocessing method is proposed. Some other methods are also used to perform the task such as grayscale transform Sobel operator and mathematical morphology. The experimental results show that the performance of the proposed Swarm Intelligence preprocessing based JTC is better than that of the JTC based on other preprocessing methods. 2009 IEEE.

Microwave holography measurement and adjustment of 25-m radio telescope of Shanghai 期刊论文 OAI收割
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, 2007, 卷号: 49, 期号: 2, 页码: 467-470
作者: Yu, Hong

收藏 | 浏览/下载：24/0 | 提交时间：2015/08/17

microwave holography antenna measurement correlator