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加拿大、法国、美国和苏联正合作进行一项试验性的搜索和营救卫星计划。这项计划的目的是论证利用低高度、高倾角轨道上的卫星所携带的设备来大大简化发现和定位遇难信号的工作。这些遇难信号是由安装在普通飞机和某些航海船上的紧急情况定位发射机(ELT)和紧急情况位置指示无线电信标机(EPIRB)发出的。卫星接收到遇难信号后把它们中继到地面站,地面站再进行信息处理,最后把确切地点传输到救援部门。现在,美国、法国和加拿大的搜索和营救工作是采用低功率无线电信标机发射电信号进行的,信标饥的工作频率是121.5兆赫
Canada, France, the United States and the Soviet Union are cooperating in a pilot satellite search and rescue program. The purpose of this project is to demonstrate that using equipment carried by satellites in low-altitude, high-inclination orbits greatly simplifies the task of finding and locating distress signals. These distress signals were issued by Emergency Locator Transmitters (ELTs) and Emergency Location Indicating Radio Beacons (EPIRBs) installed on regular aircraft and some nautical vessels. The satellites relay the signal to the earth station after receiving the distress signal, and the earth station processes the information again and finally transmits the exact location to the rescue department. At present, search and rescue operations in the United States, France and Canada are conducted using low-power radio beacons that transmit electrical signals at a frequency of 121.5 MHz