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    • 4. 发明授权
    • Warning system for microwave landing system airborne receiver
    • 微波着陆系统机载接收机警告系统
    • US4647926A
    • 1987-03-03
    • US635328
    • 1984-07-27
    • Walter L. DevenskyWayne H. Martin
    • Walter L. DevenskyWayne H. Martin
    • G01S1/02G01S19/19G08G5/00G06M3/00
    • G01S1/022G01S1/56
    • A system to provide warning whenever unreliable data is being received by an airborne receiver for a microwave landing system. The received data is tested against certain criteria to determine validity. The received data is also tested to determine whether it was received via a direct path or via a multipath reflection. A validity counter records the percentage of valid data received. A multipath counter records the length of time data is received via direct path relative to the length of time data is received via multipath. Both counters control warning flags to cause a warning to be generated whenever the counter contents are below threshold values. The validity counter is set to an upper limit when its count crosses the threshold in a positive direction and is set to a negative limit when its count crosses the threshold in a negative direction. A constant number is added to the count of the multipath counter whenever its count crosses the threshold in a positive direction and the count is cleared completely whenever the count crosses the threshold in a negative direction.
    • 一种用于微波着陆系统的机载接收机正在收到不可靠数据时提供警告的系统。 根据某些标准测试收到的数据以确定有效性。 还测试接收到的数据以确定是通过直接路径还是通过多径反射来接收。 有效计数器记录收到的有效数据的百分比。 多路径计数器记录通过直接路径接收数据的时间长度,相对于通过多路径接收数据的时间长度。 当计数器内容低于阈值时,两个计数器都会控制警告标志,以产生警告。 当有效性计数器的计数在正方向上跨越阈值时,其有效性计数器被设置为上限,并且当其计数在负方向上跨越阈值时将其设置为负极限。 当计数器的计数在正方向上越过阈值时,常数被添加到多路径计数器的计数,并且当计数在负方向上跨越阈值时,计数完全清除。