Kokusai Denshin Denwa Kabushiki Kaisha

Hiroshi Kurihara

Makoto Arai

Kazunori Inagaki

Matsuichi Yamada

Hironori Yuuki

Noboru Baba

Yasuo Hirata

Akira Ogawa

A cross polarization compensation system, in which an input elliptically polarized wave is converted, by a first rotatable differential phase shifter having a phase shift of 90.degree. or less than 90.degree., into an elliptically polarized wave defined by

Cross polarization compensation system

A cross polarization compensating system, in which two elliptically polarized waves of opposite polarities are applied to a cascade connection of two successively connected rotatable 90.degree. phase shifters and an Orthomode (Trademark) transducer. Two cross polarized wave components of the two elliptically polarized waves are detected from the two perpendicularly intersecting output terminals of the Orthomode (Trademark) transducer. Two in-phase components of the same phase as their co-polarized components of the two cross-polarized wave components and two orthogonal components each having a phase difference of 90.degree. from corresponding one of the co-polarized waves of the two cross-polarized wave components are detected from the two output terminals of the Orthomode (Trademark) transducer. One of the two phase shifters is controlled by an addition output of the two in-phase components while the other of the two phase shifters is controlled by a difference output between the two orthogonal components, so that two elliptically polarized waves at the output terminals of the Orthomode (Trademark) transducer are made equal in the cross polarization, and so that a phase difference between the co-polarized wave components and a phase difference between the cross-polarized wave components are made equal in magnitude and opposite in sign.

Cross polarization compensating system

A system for determining burst sending timing in a time division multiple access communication system using a communication satellite, in which burst signals transmitted from a plurality of stations are arranged on the communication satellite in one frame at predetermined intervals. On the transmitting side connected to the communication satellite through a radio wave path, a first signal composed of a first signal state over one frame length defined by the sending frame timing is sent, and then second, third, fourth, . . . signals each composed of the first signal state and a second state different from the first signal state are sent. In this case, the position or length of the first signal state in one frame is altered by a certain amount. On the receiving side connected to the communication satellite through a radio wave path, the number of frames of the burst signals transmitted is counted during a duration from the detection of the first signal to the detection of the next first or second state at a predetermined time slot in a frame of the burst signals, and the sending timing of each station based on the sending frame timing is determined on the base of the counted number of frames and the certain amount.

System for determining burst sending timing in TDMA communication

Growing community of inventors

Atsugi, Japan

Hiroshi Kurihara