Geomagnetic Position Fixing

地磁定位

• 批准号: 9507826
• 负责人: John Phillips
• 金额: $ 22.1万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-15 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9507826&HistoricalAwards=false
• 关键词: Geomagnetic; Position; Fixing

NON-TECHNICAL SUMMARY Phillips, John IBN-9507826 Dr. Phillips' research will investigate the use of the earth's magnetic field to determine geographic position. Previous studies of migratory/homing orientation have provided evidence for the involvement of a specialized magnetoreception mechanism in the "map" component of homing, and for effects of small changes in magnetic inclination or intensity on migratory/homing orientation. Studies of map-based homing (i.e., true navigation) will be carried out under controlled laboratory conditions where the response to manipulation of individual parameters of the magnetic field can be investigated. Two forms of orientation that involve the earth's magnetic field will be studied, i.e., magnetic compass orientation (requiring only compass information) and long-distance homing or true navigation (requiring both map and compass information). This will make it possible to distinguish effects of experimental manipulations on the map or geographic-position sense from effects on the compass. In addition, a graphical model of bicoordinate navigation developed for this work will be used to estimate the local gradients of magnetic field parameters in the vicinity of the animal's home from their behavioral responses to experimental manipulation of these parameters. These estimates can then be compared with future measured values of geographic variation in the magnetic field. Dr. Phillips' research will provide information about the sensitivity of biological systems to weak magnetic fields which will contribute to the current debate concerning possible effects of artificial sources of EMF (power lines, electrical appliances, etc.) on human health.

菲利普斯博士的研究将研究利用地球磁场来确定地理位置。先前对迁徙/归航方向的研究已经提供了证据，证明在归航的“地图”成分中涉及一种特殊的磁接收机制，以及磁倾角或强度的微小变化对迁徙/归航方向的影响。基于地图的寻的研究（即真正的导航）将在受控的实验室条件下进行，在那里可以研究对磁场单个参数的操纵的响应。本文将研究两种涉及地球磁场的定位方式，即磁罗盘定位（只需要罗盘信息）和远距离寻的或真正的导航（同时需要地图和罗盘信息）。这将使区分实验操作对地图或地理位置感的影响与对指南针的影响成为可能。此外，为这项工作开发的双坐标导航图形模型将用于从动物对这些参数的实验操作的行为反应中估计动物家附近磁场参数的局部梯度。然后可以将这些估计值与未来磁场地理变化的测量值进行比较。菲利普斯博士的研究将提供有关生物系统对弱磁场敏感性的信息，这将有助于目前关于人工电磁场源（电力线、电器等）对人类健康可能产生影响的辩论。