公开(公告)号：US5185609A

公开(公告)日：1993-02-09

申请号：US784573

申请日：1991-10-29

申请人： Claude R. DeBord

发明人： Claude R. DeBord

IPC分类号： G01S7/40

CPC分类号： G01S1/50 ,  G01S1/48 ,  G01S7/4008

摘要： A VOR monitor employs a microprocessor-based system in which, after initial analog detection of a transmitted VOR signal, the critical parameters of the signal are extracted by digital signal processing to ensure that the transmitted signal in space remains within tolerance. Initial processing to isolate the 30 Hz AM (variable) modulation component and the 30 Hz reference component is conducted in the time domain. The 30 Hz reference is recovered by FM quadrature demodulation which, as a by-product, yields data from which an rms calculation is made of the amplitude of the 9960 Hz subcarrier. Further digital processing is then conducted in the frequency domain to yield spectra from which critical parameters of the VOR signal are extracted, e.g. the phases of the 30 Hz components (determining azimuth), the modulation percentages of the 30 Hz variable and the 9960 Hz subcarrier, and the 9960 Hz FM deviation ratio. The identification tone of the transmitted VOR signal is recovered separately from the digital data by application of the Goertzel algorithm and verified by an autocorrelation analysis.

摘要翻译： VOR监视器采用基于微处理器的系统，其中在初始模拟检测发射的VOR信号之后，通过数字信号处理提取信号的关键参数，以确保空间中的发射信号保持在容限内。 在时域中进行隔离30 Hz AM（可变）调制分量和30 Hz参考分量的初始处理。 通过FM正交解调来恢复30Hz参考，作为副产品，其产生对其进行有效值计算的数据，其中9960Hz子载波的振幅是有效值计算的。 然后在频域中进行进一步的数字处理，以产生提取VOR信号的关键参数的光谱，例如。 30 Hz分量（确定方位）的相位，30 Hz变量和9960 Hz子载波的调制百分比以及9960 Hz FM偏差比。 所发送的VOR信号的识别色调通过应用Goertzel算法与数字数据分离地恢复，并通过自相关分析进行验证。