全部书籍

专业

应用 关于 Coach 登录 开始阅读

书籍暂未推出简体中文版——当前显示英文版。

Earth and Space Sciences · 术语表

什么是 Satellite gravimetry？

Definition 3.9 University Earth and Space Sciences — Year 3 · 第 3 章 — Gravity and the Figure of the Earth

Satellite gravimetry determines the Earth’s gravity field from the motion of satellites: from the long-term perturbations of their orbits, from the changing distance between two satellites on the same orbit, or from gradiometers that measure the differences of gravity across the spacecraft.

The principle of the satellite pair (schematic, not to scale). Approaching a mass excess, the leading satellite feels its attraction first and is accelerated forward, so the range between the two increases; when the trailing satellite comes over the mass the range decreases again. The range rate, measured continuously, is inverted for the gravity field.
The principle of the satellite pair (schematic, not to scale). Approaching a mass excess, the leading satellite feels its attraction first and is accelerated forward, so the range between the two increases; when the trailing satellite comes over the mass the range decreases again. The range rate, measured continuously, is inverted for the gravity field.
The two GRACE Follow-On satellites, an artist’s view (the distance between them is greatly shortened). The red beam stands for the laser ranging link. NASA/JPL-Caltech, public domain.
The two GRACE Follow-On satellites, an artist’s view (the distance between them is greatly shortened). The red beam stands for the laser ranging link. NASA/JPL-Caltech, public domain.
在原文中阅读 →