公开(公告)号：US3716791A

公开(公告)日：1973-02-13

申请号：US3716791D

申请日：1970-07-24

申请人： AMERICAN STANDARD INC

发明人： FLENTIE J ,  HARRIES W ,  ASNANI G

IPC分类号： G01S1/02 ,  G01S19/05 ,  G01S19/11 ,  G01S19/21 ,  G01S19/29 ,  G01S19/46 ,  H04B1/00

CPC分类号： G01S1/026

摘要： A flag alarm system for a VOR receiver (applicable to other purposes) in which two 30 Hz signals of relatively variable phase normally present in two channels of the receiver, while the latter is operating properly, are multiplied together to produce modulation products including a dc component having a value which is a function of said phase, and which in one form of the invention is employed in a servo loop which indicates or controls said phase, and also a double frequency signal of peak amplitude independent of phase difference but a function of the products of the amplitudes of the 30 Hz signals. The double frequency signal operates to hold a flag inoperative, but cannot hold the flag if either or both 30 Hz signals disappear or are radically reduced in amplitude. The system indicates the presence or absence of valid signals, i.e. the two 30 Hz signals, and overall system malfunction, on a fail-safe basis.

摘要翻译： 用于VOR接收机的标志报警系统（适用于其他目的），其中在接收机的两个通道中正常存在的两个相对可变相位的30Hz信号在后者正常工作时相乘，以产生包括直流 分量具有作为所述相位的函数的值，并且在本发明的一种形式中，用于指示或控制所述相位的伺服环路，以及与相位差无关的峰值振幅的双频信号， 产品的振幅为30 Hz信号。 双频信号用于保持标志不起作用，但是如果30Hz信号中的任一个或两个信号消失或幅度急剧减小，则不能保持标志。 在故障安全的基础上，系统指示是否存在有效信号，即两个30 Hz信号，以及整个系统故障。