Kabushiki Kaisha Toshiba

Masaru Oka

Masashi Suenaga

Masatoshi Harigae

Hideo Kikuchi

Yoichi Koishi

Yukiyoshi Fujimori

In a broadcasting receiver, to quickly switch channels of the received multiplexed broadcasting signals at a high response speed to improve the convenience for a viewer, when broadcasting signals of a plurality of channels are to be code-division-multiplexed and broadcasted from a ground broadcasting station (BCBC) to a broadcasting receiver (MS) in a service area via a geostationary satellite (SAT), the broadcasting signals are multiplexed and transmitted after matching the spreading code phase between the channels in the ground broadcasting station (BCBC). Alternatively, the spreading code phase difference between the channels of a CDM broadcasting signal arriving from the ground broadcasting station (BCBC) is detected in the geostationary satellite (SAT), and the broadcasting signal is transmitted to the broadcasting receiver (MS) after matching the spreading code phase between the channels on the basis of the detection result.

Satellite broadcasting system

A clock test apparatus connected to a GPS receiver mounted in a moving body has a frequency counter which counts clocks output from a clock generator incorporated in the GPS receiver for a predetermined period of time. In this manner, a clock frequency is detected and supplied to a clock error identification section. The clock error identification section calculates a short-term stability from the clock frequency, and further calculates a clock error on the basis of the short-term stability. The clock error data is supplied to a dynamics simulator. The dynamics simulator simulates circuit dynamics of the GPS receiver, and models error in the velocity of the moving body relative to a satellite, which results from the clock error, on the basis of the clock error data, thereby analyzing the performance of the GPS receiver.

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Yokohama, Japan

Masaru Oka