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Manifold-Based System for Passive-Active Spectrum Sharing

基于流形的无源-有源频谱共享系统

基本信息

批准号：
1248010
负责人：
Albin Gasiewski
金额：
$ 49.98万
依托单位：
University of Colorado at Boulder
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-09-01 至 2016-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1248010&HistoricalAwards=false
关键词：
Manifold Based System Passive Active

项目摘要

Terrestrial-based wireless transmitters can often cause interference to space-based remote sensing instrumentation, such as satellites that are designed to probe the Earth's land, ocean, and atmosphere. Remote sensing observations of the Earth are often acquired using low-Earth orbit satellites that scan a narrow swath of the Earth at any one time, and orbit the Earth once each 90 minutes or so. The satellite detectors are often exposed to specific interference sources for only a few tens of milliseconds as the satellite passes overhead and the detector beam passes over the Earth's surface at very high speed, but that exposure is sufficient to produce substantial interference to the very sensitive observations being acquired by the satellite. One method of mitigating the interference is to synchronize very brief blanking of terrestrial interference sources as a remote sensing satellite using the same band passes overhead, leveraging the fact that satellite orbits are very well known and the specific point of time at which a sensor pixel will be passing over a particular point on the Earth can be determined with high accuracy. This method is one example of a broader application of coordinated interference mitigation techniques that will be explored as part of this research. The broader applications may extend beyond satellites to cases of interference between and among a large variety of land-, air-, and space-based users.

地面无线发射机通常会对天基遥感仪器造成干扰，例如用于探测地球陆地、海洋和大气层的卫星。对地球的遥感观测通常是使用低地球轨道卫星获得的，这些卫星在任何时候都扫描地球的一个狭窄地带，大约每90分钟绕地球轨道运行一次。当卫星从头顶飞过，探测器光束以非常高的速度掠过地球表面时，卫星探测器往往只在几十毫秒内暴露于特定的干扰源，但这种暴露足以对卫星获得的非常敏感的观测结果产生重大干扰。减轻干扰的一种方法是使地面干扰源的非常短暂的消隐与遥感卫星使用相同的带通过头顶同步，利用卫星轨道是非常公知的并且可以高精度地确定传感器像素将通过地球上的特定点的特定时间点的事实。这种方法是一个更广泛的应用协调干扰缓解技术，将探讨作为本研究的一部分的一个例子。更广泛的应用可能超越卫星，涉及各种陆基、空基和天基用户之间的干扰。