There are three types of 406 emergency beacons used to transmit distress signals, EPIRBs (for maritime use), ELTs (for aviation use), and PLBs (handheld personal, portable units for remote-environment use). 406 MHz Emergency beacons are digitally coded and transmit distress signals immediately upon activation. 406 refers to the proprietary ...

406 MHz UHF beacons transmit bursts of digital information to orbiting satellites, and may also contain a low-power integrated analog (121.500 MHz) homing beacon. They can be uniquely identified (via GEOSAR). Advanced beacons encode a GPS or GLONASS position into the signal. All beacons are located by Doppler triangulation to confirm the location.

应急无线电示位标（EPIRB，Emergency position indicating radio beacon）常简称为 示位标，因工作 频率 在406MHz附近也常被简称406，也称为应急 无线电 示位标。 仅含 GPS 的紧急无线电示位标常被称为卫星紧急无线电示位标。 紧急无线电示位标在船/海洋平台下沉后，自动弹出浮到水面，发求救信号，信号通过COSPAS-SARSAT系统转发到地面站。 与多用于海上用户的紧急无线电示位标相类似，陆上应用的类似产品叫做个人示位标（PLB，Personal Locator Beacon）， …

2023年9月24日 · 406兆赫遇险信标是你的最佳选择。它有一个功能——在激活后几分钟内直接提醒搜救机构你有麻烦需要帮助。 406遇险信标的三种主要类型:是荒野使用、海洋和航空而设计的。

The introduction of 406 MHz distress beacons presents new challenges to search and rescue organizations worldwide, including Civil Air Patrol. Prosecuting a 406 distress beacon emission is not the same as the customary 121.5 MHz signals to which SAR organizations have become accustomed; however, 121.5 will still play an important role in the ...

航空应急频率（英语：aircraft emergency frequency，也称GUARD）是 航空 波段 上保留的一个用于 遇险 飞机 通信 的 频率。 民用的该频率为121.5 MHz，也称国际航空遇险信号（International Air Distress，IAD）或甚高频守听（VHF Guard）；而243.0 MHz则供军事用途，也称军用航空遇险信号（Military Air Distress，MAD）或特高频守听（UHF Guard） [1]。 早期的 应急定位发射机 （ELT）使用守听频率发信，但更现代的应急定位发射机已改用406 MHz频率。 国际民用航空 …

What is the Cospas-Sarsat Program? The Cospas-Sarsat Program is an international organization that provides space-based relay of distress signals, or alerts, from emergency beacons that use the 406 megahertz (MHz) frequency. Cospas-Sarsat provides the alerts to search and rescue (SAR) authorities internationally.

Newer 406 MHz Distress Beacons are now being sold that transmit on 406 MHz channels that are not detectable by CAP’s current airborne direction finder, the Becker SAR-DF 517.

2022年11月15日 · 406 MHz应急信标采用数字编码，激活后立即发送遇险信号。 406指的是这些信标发射的专用无线电波长（频率是406MHz）。 这意味着即使是一个无意的短暂碰触也会产生错误警报。

Emergency position indicating radiobeacons (EPIRBs), devices which cost from $200 to about $1500, are designed to save your life if you get into trouble by alerting rescue authorities and indicating your location. EPIRB types are described below: 406/121.5 MHZ. Float-free, automatically activated EPIRB.