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西德SEL公司与西德空中交通管理当局紧密合作,并由联邦研究技术部投资,介绍一种新的无线电导航设备。值得注意的是新系统4000,其元件具有高度通用性;机内微处理机和灵活的软件可提供仪表着陆系统、无线电VOR和多普勒
West Germany SEL works closely with the West German air traffic control authorities and is funded by the Federal Research Technology Department to introduce a new radio navigation equipment. Of note is the new system 4000, whose components are highly versatile; in-flight microprocessors and flexible software provide instrument landing systems, radio VOR and Doppler