在双脉冲连贯系统上的多功能目标的微运动特征
Si Chen1, Haiyang Zhang1, Lin Wang1
1School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China.
Heliyon
|February 14, 2024
概括
本研究使用双脉冲连贯系统分析了多特征的目标微运动. 研究结果揭示了目标特征如何影响回声信号,有助于形状和运动识别.
科学领域:
- 大气光学和雷达信号处理.
- 一致的传感和目标表征.
背景情况:
- 了解微运动特征对于目标识别至关重要.
- 大气条件可以显著影响雷达回声信号.
研究的目的:
- 通过使用双脉冲连贯系统,研究多功能目标的微运动特征.
- 模拟回声信号并分析影响因素,如目标形状和事件方向.
- 评估这些参数对目标属性逆转的有用性.
主要方法:
- 在双脉冲连贯系统中对回声信号的理论模型的推理.
- 分析微运动,光点大小,目标形状和事件方向效应.
- 模拟Lidar截面 (LRCS),回声波形,强度和能量分布.
主要成果:
- 频率转移受微运动,相对大小,目标形状和事件方向的影响.
- 在各种条件下模拟LRCS,回声波形,强度和能量分布.
- 该研究确定了影响回声信号特征的关键参数.
结论:
- 分析的参数为逆转目标形状属性提供了有价值的信息.
- 这些发现提高了通过雷达确定目标运动类型的能力.
- 双脉冲连贯系统在大气条件下对微运动分析有效.
相关概念视频
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
805
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
805
01:12Double Resonance Techniques: Overview
208
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
208