海洋表面波浪测量使用闪光理论在海上软件定义的GPS和SBAS反射计观测
Lung-Chih Tsai1,2, Hwa Chien1,3, Shin-Yi Su1
1Center for Space and Remote Sensing Research, National Central University, Taoyuan 320317, Taiwan.
Sensors (Basel, Switzerland)
|July 14, 2023
概括
这项研究介绍了一种低成本的GPS和基于卫星的增强系统 (SBAS) 反射计系统,用于测量海洋波. 该系统使用信号闪精确地确定海洋表面波速,并通过浮标数据验证.
科学领域:
- 海洋学 海洋学 海洋学
- 遥感 遥感 遥感 遥感
- 电磁学 电磁学 电磁学 电磁学
背景情况:
- 海洋表面波的参数对于海洋航行和天气预报至关重要.
- 现有的遥感方法用于海洋波的测量可能是昂贵和复杂的.
- 基于卫星的增强系统 (SBAS) 反射测量提供了一个潜在的低成本替代方案.
研究的目的:
- 开发和验证一个低成本的,软件定义的全球定位系统 (GPS) 和SBAS反射计 (GPS&SBAS-R) 系统,用于测量海洋表面波浪参数.
- 调查GPS&SBAS-R信号强度闪和海洋波特征之间的关系.
- 为了比较衍生的海洋波速与独立的浮标测量.
主要方法:
- 在R/V NOR-1研究船上实施了一种新的GPS&SBAS-R系统.
- 从粗的海洋表面散射的电磁波被用功率定律光谱和小扰动方法建模.
- 分析了高采样GPS和SBAS-R数据中的强度闪,以得出海洋表面波浪参数.
- 海洋表面的波速是根据弗雷尼尔过的海拔波动来确定的,考虑到第一弗雷尼尔区的距离和波速.
主要成果:
- 开发的GPS&SBAS-R系统成功地测量了海洋表面的波浪参数.
- 信号强度闪被确定为海洋表面动态的关键指标.
- 发现闪功率光谱取决于第一个弗雷内尔区的距离和海洋表面波速.
- 来自海洋表面的波速与附近的浮标测量结果一致,验证了系统的性能.
结论:
- 低成本的GPS&SBAS-R系统是测量海洋表面波浪参数的可行工具.
- 信号闪的分析为估计海洋波特征提供了一种新的方法.
- 这项技术有可能通过具有成本效益的波浪监测来增强海洋安全和海洋学研究.
相关概念视频
01:30Types of Global Positioning System Surveys
81
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
81
01:03Precipitation Gravimetry
6.7K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
6.7K
01:07Propagation of Waves
2.4K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.4K
01:10Wave Parameters
7.8K
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
7.8K
01:26Influence of Earth's Curvature and Atmospheric Refraction on Leveling
151
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
151
01:30Electronic Distance Measuring Instruments
63
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
63