Radio communication system, mobile terminal unit thereof, and azimuth determining method
First Claim
1. A radio communication system comprising a reference station which transmits an azimuth designation signal having directivity toward a predetermined reference azimuth, and a plurality of terminal stations which can receive said azimuth designation signal transmitted from said reference station, wherein a target terminal station, included in said plurality of terminal stations, comprises receiving means which receives the azimuth designation signal transmitted from the reference station, arrival direction obtaining means which obtains an arrival direction of the azimuth designation signal received by said receiving means, azimuth designation signal generating means which generates a new azimuth designation signal having directivity in the direction opposite to the arrival direction of the azimuth designation signal obtained by said arrival direction obtaining means, and transmitting means which allows the azimuth designation signal generated by said azimuth designation signal generating means to have directivity in a direction designated by the azimuth designation signal and then transmits the signal.
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Accused Products
Abstract
Disclosed are a mobile station unit which can obtain azimuth information with a simple construction and a radio communication system including the mobile terminal unit. According to the present invention, in a terminal station, an arrival direction obtaining section 203 obtains an arrival direction of a received azimuth designation signal from a reference station or another terminal station using an arithmetic operation or the like. A transmitting direction forming section 204 determines the direction opposite to the arrival direction obtained by the arrival direction obtaining section 203 as a transmitting direction. A reference azimuth detecting section 207 detects the transmitting direction determined by the transmitting direction forming section 204 as a reference azimuth. An azimuth designation signal generating section 205 generates an azimuth designation signal so as to radiate radio waves having directivity in the transmitting direction determined by the transmitting direction forming section 204.
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Citations
15 Claims
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1. A radio communication system comprising a reference station which transmits an azimuth designation signal having directivity toward a predetermined reference azimuth, and a plurality of terminal stations which can receive said azimuth designation signal transmitted from said reference station, wherein
a target terminal station, included in said plurality of terminal stations, comprises receiving means which receives the azimuth designation signal transmitted from the reference station, arrival direction obtaining means which obtains an arrival direction of the azimuth designation signal received by said receiving means, azimuth designation signal generating means which generates a new azimuth designation signal having directivity in the direction opposite to the arrival direction of the azimuth designation signal obtained by said arrival direction obtaining means, and transmitting means which allows the azimuth designation signal generated by said azimuth designation signal generating means to have directivity in a direction designated by the azimuth designation signal and then transmits the signal.
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13. An azimuth determining method for determining an azimuth in a terminal station, comprising the steps of:
- in a reference station, transmitting an azimuth designation signal so as to have directivity toward a predetermined reference azimuth; and
in said terminal station, receiving said azimuth designation signal, obtaining an arrival direction of the azimuth designation signal, generating a new azimuth designation signal having directivity in the direction opposite to said obtained arrival direction, transmitting said new generated azimuth designation signal, specifying a reference azimuth on the basis of the arrival directions of the azimuth designation signals transmitted from the reference station and the terminal station, and determining an azimuth on the basis of the specified reference azimuth.
- in a reference station, transmitting an azimuth designation signal so as to have directivity toward a predetermined reference azimuth; and
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14. A mobile terminal unit comprising:
- receiving means which receives an azimuth designation signal, which is transmitted from a reference station so as to have directivity in a previously set reference azimuth;
arrival direction obtaining means which obtains an arrival direction of said azimuth designation signal received by said receiving means;
azimuth designation signal generating means which generates a new azimuth designation signal having directivity in the direction opposite to the arrival direction of the azimuth designation signal;
reference azimuth specifying means which detects the direction of the directivity of the new azimuth designation signal generated by said azimuth designation signal generating means as a reference azimuth; and
transmitting means which transmits the azimuth designation signal generated by the azimuth designation signal generating means so as to have directivity in a direction designated by the azimuth designation signal. - View Dependent Claims (15)
- receiving means which receives an azimuth designation signal, which is transmitted from a reference station so as to have directivity in a previously set reference azimuth;
Specification