全球导航卫星系统应用
遥感
双基地雷达
散射计
高度计
多径传播
计算机科学
雷达
地质学
环境科学
全球定位系统
雷达成像
电信
频道(广播)
作者
Valery U. Zavorotny,Scott Gleason,Estel Cardellach,Adriano Camps
出处
期刊:IEEE Geoscience and Remote Sensing Magazine
[Institute of Electrical and Electronics Engineers]
日期:2014-12-01
卷期号:2 (4): 8-45
被引量:381
标识
DOI:10.1109/mgrs.2014.2374220
摘要
In traditional GNSS applications, signals arriving at a receiver's antenna from nearby reflecting surfaces (multipath) interfere with the signals received directly from the satellites which can often result in a reduction of positioning accuracy. About two decades ago researchers produced an idea to use reflected GNSS signals for remote-sensing applications. In this new concept a GNSS transmitter together with a receiver capable of processing GNSS scattered signals of opportunity becomes bistatic radar. By properly processing the scattered signal, this system can be configured either as an altimeter, or a scatterometer allowing us to estimate such characteristics of land or ocean surface as height, roughness, or dielectric properties of the underlying media. From there, using various methods the geophysical parameters can be estimated such as mesoscale ocean topography, ocean surface winds, soil moisture, vegetation, snowpack, and sea ice. Depending on the platform of the GNSS receiver (stationary, airborne, or spaceborne), the capabilities of this technique and specific methods for processing of the reflected signals may vary. In this tutorial, we describe this new remotesensing technique, discuss some of the interesting results that have been already obtained, and give an overview of current and planned spacecraft missions.
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