排序方式: 共有8条查询结果,搜索用时 46 毫秒
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《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2012,664(1):171-185
When an ultra-high energy neutrino or cosmic-ray strikes the Lunar surface a radio-frequency pulse is emitted. We plan to use the LOFAR radio telescope to detect these pulses. In this work we propose an efficient trigger implementation for LOFAR optimized for the observation of short radio pulses. 相似文献
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Ali MassoudAuthor Vitae Abdallah OsmanAuthor Vitae 《Computers & Electrical Engineering》2012,38(4):986-993
The Directional Frequency Analysis and Recording (DIFAR) sonobuoy has been widely used in underwater target localization because it can capture more information than the Low Frequency Analysis and Recording (LOFAR) omnidirectional sonobuoy. Recently, array processing for fields of DIFAR sonobuoys has attracted considerable attention in order to enhance the direction of arrival (DOA) estimation performance and accuracy. DIFAR sonobuoys may become irregularly spaced due to the deployment method and the drift experienced once deployed, resulting in a nonuniform array. In this paper, we demonstrate the fourth-order cumulant beamforming (FOC-BF) technique to estimate the DOA for a nonuniform linear array of DIFAR sonobuoys. FOC-BF was compared with the conventional beamforming (CBF) through simulation works. The results show that FOC-BF provides better spatial spectrum with lower sidelobes than CBF. Furthermore, FOC-BF provides superior DOA estimation accuracy over CBF at very low signal to noise ratios (SNR). 相似文献
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LOFAR浮标是一种被动全向浮标,主要用于对潜搜索初始阶段.常用的定位算法很多,这些方法的基本思想是最大限度地利用LOFAR和CODAR分析得到的目标信息,通过粗测和细测交替进行的方法,最终精确得到目标参数.针对Doppler-CPA、LOFIX和HYFIX定位算法进行分析和仿真,结果表明这三种算法能够很好地实现对目标的检测,最终精确得到目标参数. 相似文献
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A New Single DIFAR Sonobuoy Target Location Algorithm 总被引:1,自引:0,他引:1
In order to solve the problem of target location of single direction finding and ranging(DIFAR) sonobuoy, a new target location algorithm is proposed. Based on the new generation of high performance sonobuoy signal processing platform, the new algorithm makes full use of the Doppler information of the targets while using the target location data, and successfully implements the target detection, location and tracking. In the calculation of target parameters, the new algorithm utilizes the repeated measurement data to further improve the calculation accuracy of the target parameters using the principle of Least Square. The simulation results indicate the correctness of the new algorithm. The algorithm is simple, stable and easily implemented in engineering. And besides, it overcomes the weakness of the traditional algorithm which requires at least two DIFAR buoys to locate the targets. 相似文献
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声呐浮标可以对目标进行检测、定位、跟踪和分类识别,因此浮标定位算法的研究非常关键。目前常用的算法有低频搜索与记录(LOFAR),相关探测与搜索(CODAR)等,主要对这两种声呐浮标定位算法进行了研究和计算机仿真分析,在不同背景条件下研究了各种算法的原理和性能。 相似文献
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水下目标的特征提取一直是水声信号处理的难题。由于实际的声纳目标的发声机理和反射声波的机理十分复杂,成份多样,造成水声信号具有较强的非平稳性和非高斯性。为了提高对水下目标识别的正确识别率,突破以往研究中关于信号平衡性的假设和高斯性的假设,本文在简要介绍了LOFAR谱图和高阶谱(HOS)估计方法之后,提出了一种基于高阶谱的LFAR谱图和高阶谱(HOS)估计之后,提出了一种基于高阶谱的LOFAR谱图特征 相似文献
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