公开(公告)号：WO1997029389A1

公开(公告)日：1997-08-14

申请号：PCT/US1997002277

申请日：1997-02-12

Applicant: ALLIEDSIGNAL INC.

Inventor： ALLIEDSIGNAL INC. ,  SNYDER, John, D., Jr. ,  KESTNER, Rory, L. ,  POE, John, J. ,  WILLIAMS, Stephen, Paul ,  MCANULTY, Barry, A. ,  FRIEDRICH, Bryan, G.

IPC: G01S13/94

CPC classification number: G01C5/005 ,  G01S13/345 ,  G01S13/882 ,  G01S13/94

Abstract: An integrated flight safety device for general aviation aircraft includes a radio altimeter and flight data recorder.

Abstract translation: 通用航空飞机的集成飞行安全装置包括无线电高度计和飞行数据记录仪。

公开(公告)号：WO1997029387A1

公开(公告)日：1997-08-14

申请号：PCT/US1997002279

申请日：1997-02-12

Applicant: ALLIEDSIGNAL INC.

Inventor： ALLIEDSIGNAL INC. ,  POE, John, J.

IPC: G01S13/34

CPC classification number: G01S13/94 ,  G01C5/005 ,  G01S13/345 ,  G01S13/882

Abstract: A relatively low-cost FMCW radio altimeter includes a voltage-controlled oscillator based upon a GaAs FET. The oscillator produces, for example, a 4.3 GHz microwave signal that is modulated with a triangular wave having a pin-selectable modulation frequency. The modulated signal is amplified by a buffer amplifier, as well as a power amplifier, and connected to an RF output terminal by way of a plurality of microstrips. Reflected signals are received at an RF input and are coupled to a mixer by way of low-noise amplifier. The modulation signal is also applied to the mixer by way of a microstrip coupling device to produce an audio output signal whose frequency is proportional to the altitude above ground. The gains of all of the amplifiers are selected to eliminate the need for hand-tuning of the microstrips and to enable the use of a glass/epoxy circuit board. The output of the radio altimeter is an audio signal whose frequency is proportional to the height above ground, which enables direct digital conversion by way of a frequency-to-binary converter.

Abstract translation: 相对低成本的FMCW无线电高度计包括基于GaAs FET的压控振荡器。 振荡器产生例如用具有引脚可选调制频率的三角波调制的4.3GHz微波信号。 调制信号由缓冲放大器以及功率放大器放大，并通过多个微带连接到RF输出端。 在RF输入处接收反射信号，并通过低噪声放大器耦合到混频器。 调制信号也通过微带耦合器件施加到混频器，以产生频率与地面高度成比例的音频输出信号。 选择所有放大器的增益以消除对微带的手动调谐的需要并且能够使用玻璃/环氧电路板。 无线电高度计的输出是一个音频信号，其频率与地面高度成正比，可以通过频率到二进制转换器进行直接数字转换。