机构

• 力学研究所 [1]
• 长春光学精密机械与物... [1]
• 云南天文台 [1]

采集方式

• OAI收割 [3]

内容类型

• 会议论文 [3]

发表日期

• 2020 [1]
• 2008 [2]

学科主题

• 天文学 [1]
• 天文学::射电天文学 [1]
• 天文学::射电天文学... [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发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 The application of ratio correction method in radio spectrum 会议论文  OAI收割 Changsha, Hunan, China, 2020-12-18 作者:  Zhang, Yankun;  Li, Mingyue;  He, Lesheng;  Dong L(董亮);  Wang M(汪敏)   |  收藏  |  浏览/下载：38/0  |  提交时间：2021/10/19 Discrete digital power spectrum  Ratio correction method  Spectral lines   Correction method for detection of the frequencies of railway fsk signals (EI CONFERENCE) 会议论文  OAI收割 2008 9th International Conference on Signal Processing, ICSP 2008, October 26, 2008 - October 29, 2008, Beijing, China 作者:  Yu J. 收藏  |  浏览/下载：68/0  |  提交时间：2013/03/25 In order to acquire the information of railway binary frequency-shift keying signals  which include upper/down side frequencies and base low-frequency with high-accuracy  a novel frequency detection algorithm for France UM-71 system is proposed. Combining fast Fourier transform with the ratio correction method  the carrier frequency and the base frequency are obtained. Furthermore  the hardware consumption has been decreased. And it possesses the advantage of simple algorithm and fast operation speed. Comparing with the detection of the base frequency  the upper/down side frequency of railway signal is more difficult. Based on spectrum analysis and the spectrum correction  a new method  which adopts the sliding window  is put forward in this paper. The absolute differences between the upper side frequencies and the down side frequencies obtained are regarded as the criterion for judgment. Then the set of data  in which the maximum absolute value is  is to be the result of the upper/down side frequency. Because the sliding window will go through every stage when the upper/down side frequency changes  therefore  it is not sensitive enough to the position of data which need to be transformed. Using the method mentioned above  the experiment results show that the accuracy requirement of the side frequency is satisfied well. 2008 IEEE.   Investigation on a truncated streamline-traced hypersonic Busemann inlet 会议论文  OAI收割 15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, Dayton, OH, United states, April 28, 2008 - May 1, 2008 作者:  Xiao YB(肖雅彬);  Yue LJ(岳连捷);  Gong P;  Chang XY(张新宇) 收藏  |  浏览/下载：34/0  |  提交时间：2017/06/01 Boundary layer corrections  Busemann inlet  Core flow  Correction method  Design points  Finite differential methods  Internal contraction ratio  Internal flows  Mass flow