公开(公告)号：US4201963A

公开(公告)日：1980-05-06

申请号：US872709

申请日：1978-01-26

申请人： George R. Welti

发明人： George R. Welti

IPC分类号： H01P1/10 ,  H01P1/12

CPC分类号： H01P1/122

摘要： A microwave guide switch having a rotor and stator each having ports spaced at 60.degree. intervals and a connecting waveguide transmission means connected to two ports spaced 120.degree. apart which forms a 3-position, 4-port switch.

摘要翻译： 一种具有转子和定子的微波导向开关，每个转子和定子各自具有间隔60°的端口，以及连接到两个间隔120°的端口的连接波导传输装置，其形成3位4端口开关。

公开(公告)号：US4404532A

公开(公告)日：1983-09-13

申请号：US362326

申请日：1982-03-26

申请人： George R. Welti

发明人： George R. Welti

IPC分类号： H04B17/00 ,  H04L5/02 ,  H04L27/36 ,  H03C5/00 ,  H03D3/18 ,  H04J9/00

CPC分类号： H04L27/362 ,  H04L5/02

摘要： A modulator is disclosed for use with digitized multiplexed voice channels in which service bits are transmitted using QPSK modulation while the audio information is transmitted using amplitude and phase modulation. The audio information in each channel is digitized and compressed using a mapping technique in which zero crossings of the audio signal are represented by binary O. The digitized channels are then multiplexed and coupled to the address inputs of a read-only memory. In the memory are stored digital numbers which represent in quadrature the amplitude and phase of the pulse to be transmitted corresponding to the digital data sample or service word then being presented at the address inputs of the memory. The digital numbers for the control words represent a constant amplitude while those corresponding to the data words represent an amplitude dependent upon the level of the original audio signal. No output carrier is produced for zero-value audio signals. A greater number of audio channels may be multiplexed within a given bandwidth than with previous systems while greatly reducing the required transmitter power.

摘要翻译： 公开了一种与数字化多路复用语音信道一起使用的调制器，其中使用幅度和相位调制发送音频信息时，使用QPSK调制来发送服务比特。 每个通道中的音频信息使用映射技术进行数字化和压缩，其中音频信号的过零点由二进制O表示。数字化通道然后被复用并耦合到只读存储器的地址输入。 在存储器中存储数字数字，它们正交地表示对应于数字数据样本或服务字的待发送的脉冲的幅度和相位，然后呈现在存储器的地址输入端。 控制字的数字数字表示恒定幅度，而对应于数据字的数字数字表示取决于原始音频信号电平的幅度。 没有为零值音频信号产生输出载波。 在给定的带宽内可以将多个音频信道多路复用到先前的系统，同时大大减少所需的发射机功率。

公开(公告)号：US4201992A

公开(公告)日：1980-05-06

申请号：US898051

申请日：1978-04-20

申请人： George R. Welti

发明人： George R. Welti

IPC分类号： H01Q19/17 ,  H01Q25/00 ,  H01Q1/28

CPC分类号： H01Q19/17 ,  H01Q25/007 ,  Y10S343/02

摘要： A multibeam communications satellite uses a dish-shaped reflector whose surface is a surface of revolution generated by rotating a plane parabola about an axis of revolution located in the plane of the parabola but angularly displaced from the axis of symmetry thereof. The line of revolution of the focal point of the parabola defines a focal circle, and a feed located on the focal circle will illuminate an area lying on a circle near the edge of the earth's apparent disc. Since every plane in which the axis of revolution lies is a plane of symmetry, the antenna exhibits good cross polarization cancellation, making the satellite particularly useful in frequency reuse communications systems.

摘要翻译： 多波束通信卫星使用盘形反射器，其表面是通过围绕位于抛物线的平面中的旋转轴旋转平面抛物线而产生的旋转表面，但是从其对称轴线成角度地移位。 抛物面焦点的转动线定义了一个焦点圆，位于焦点圆上的进给点将照亮靠近地球表观圆盘边缘的圆周上的区域。 由于旋转轴所在的每个平面都是对称平面，所以天线表现出良好的交叉极化消除，使卫星在频率复用通信系统中特别有用。

公开(公告)号：US4084137A

公开(公告)日：1978-04-11

申请号：US717439

申请日：1976-08-24

申请人： George R. Welti

发明人： George R. Welti

IPC分类号： H04B14/00 ,  H04L27/00 ,  H04L27/34 ,  H04L27/36 ,  H04L27/38 ,  H03K7/10

CPC分类号： H04L27/3438 ,  H04B14/008 ,  H04L27/362 ,  H04L27/3827

摘要： Phase and amplitude modulation of single or multiple pulses and/or dual polarizations are used in a digital communications system which transmits multidimensional codes. Four dimensional code transmission is specifically disclosed, although the scheme may be extended to eight-dimensional and even 16-dimensional code transmission. The four-dimensional codes are constructed by mapping a digital word into two two-dimensional plane as two sets of x and y coordinates. Signals proportional to these x and y coordinates are used to modulate a transmitted pulse or pulses. When a single pulse is used to transmit the four-dimensional code, polarization modulation is used. A signal proportional to the square root of the sum of the squares of the coordinates assigned to both the horizontal and vertical polarizations is used to control the total RF amplitude of the pulse. A signal proportional to the ratio of the square roots of the sum of the squares to each set of coordinates is used to control the ratio of horizontal to vertical polarization. Finally, the phases of the two polarizations are controlled by signals proportional to the ratios of the coordinates in the respective sets of coordinates. When two pulses are used to transmit the four-dimensional code, quadrature amplitude modulation is used. Signals proportional to the coordinates of each set are used to quadrature amplitude modulate a respective one of the two pulses. Encoding and decoding between digital and the four-dimensional code is accomplished with read only memories.

摘要翻译： 在发送多维码的数字通信系统中使用单个或多个脉冲和/或双极化的相位和幅度调制。 具体地公开四维码传输，尽管该方案可以扩展到八维甚至十六维码传输。 通过将数字字映射成两个x和y坐标的两个二维平面来构造四维码。 与这些x和y坐标成比例的信号用于调制发射的脉冲或脉冲。 当使用单个脉冲来传输四维码时，使用偏振调制。 使用与分配给水平和垂直偏振的坐标的平方和的平方根成比例的信号来控制脉冲的总RF幅度。 使用与平方和的平方根与每组坐标的比例成比例的信号来控制水平与垂直偏振的比率。 最后，两个极化的相位由与各组坐标中的坐标的比例成比例的信号控制。 当使用两个脉冲发送四维码时，使用正交幅度调制。 与每组的坐标成比例的信号用于对两个脉冲中的相应一个进行正交幅度调制。 数字与四维码之间的编码和解码是用只读存储器完成的。