The World Magnetic Model (WMM) is the standard model for navigation, attitude, and heading referencing systems that use the geomagnetic field. The WMM is also used for civilian applications, including navigation and heading systems. A new version of the model is updated every five years to address changes in Earth’s magnetic field.

The World Magnetic Model High Resolution (WMMHR) is an advanced geomagnetic field model that provides a more detailed, accurate depiction of the geomagnetic field than the World Magnetic Model (WMM). WMMHR2025 includes core field and secular variation coefficients for degrees n = 1 to 15.

The World Magnetic Model High Resolution (WMMHR) is an advanced geomagnetic field model that provides a more detailed, accurate depiction of the geomagnetic field than the World Magnetic Model (WMM). WMMHR2025 includes core field and secular variation coefficients for degrees n = 1 to 15.

2024年12月17日 · The latest version of the World Magnetic Model (WMM), one of the key tools developed to model the change in Earth's magnetic field, has been released. The WMM is a spherical harmonic model of the Earth’s main magnetic field and its slow temporal change.

The World Magnetic Model is the standard model used by the U.S. Department of Defense, the U.K. Ministry of Defence, the North Atlantic Treaty Organization (NATO) and the International Hydrographic Organization (IHO), for navigation, attitude and heading referencing systems using the geomagnetic field.

2024年12月18日 · 世界磁场模型（WMM）是一种球面谐波模型，它描述了地球的主磁场及其缓慢的时间变化。 WMM 模型是全球导航的关键，它能够确保依赖 地球磁场 的各种技术系统正常运行。 这些系统包括： 航空导航： 飞机，包括军用和民用飞机，都依赖于 WMM 模型进行导航和定位。 航海导航： 船舶和潜艇使用 WMM 模型来确定方向和位置。 地面导航： GPS 单元和智能手机中的导航应用程序利用 WMM 模型来校正罗盘和提供准确的定位。 其他应用： WMM 模型也 …

About WMM. Learn more about model derivation, uncertainties and magnetic poles. Model & Software. Download model coefficients, software and documentation. Online Calculators. Calculate magnetic field values at or near the Earth surface. Maps. Browse imagery and contour maps for main field and secular change. Uses of WMM. Common applications of ...

WMM （Wi-Fi Multimedia）技术是Wi-Fi网络中的一种质量服务（QoS，Quality of Service）机制，旨在改善无线网络中多媒体应用（如语音、视频、音频流和在线游戏）的传输质量。 它是基于Wi-Fi标准（IEEE 802.11e）的一项扩展，专门用于优先保障对延迟、丢包敏感的流量，如 VoIP （语音传输）、视频会议和高质量音视频流。 WMM的工作原理. WMM通过对Wi-Fi网络中的数据流进行分类、标记并进行优先级调度，从而确保高优先级的多媒体流量得到优先传输。 这种机 …

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