Sensor unit
First Claim
1. A sensor unit for mounting on a mobile unit, the sensor unit comprising:
- an antenna section including at least an antenna element for receiving a high-frequency signal from an external positioning system;
a sensor section including at least a gyro sensor for detecting an angular velocity of the mobile unit and an acceleration sensor for detecting an acceleration of the mobile unit;
a combining circuit including at least a first signal line through which the high-frequency signal output from said antenna section is sent, a second signal line through which a signal output from said sensor section is sent, and a node for generating a composite signal by combining the high-frequency signal from said antenna section and the signal output from said sensor section such that the high-frequency signal and the signal occupy different frequency bandwidths and are output from said node simultaneously, said node being a connection point of said first signal line and said second signal line; and
a casing accommodating said antenna section, said sensor section, and said combining circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
In a sensor unit, an antenna section receives a high-frequency signal transmitted from a positioning system for output to a combining circuit. Also, in the sensor unit, a sensor section detects an angular velocity around one axis, and further detects an acceleration in directions of two axes (that is, X and Y axes) . Furthermore, the sensor section uses the detected angular velocity and acceleration to generate a data unit including at least data indicative of the angular velocity and data indicative of the acceleration. The sensor section then performs a digital modulation process with the generated data unit. The combining circuit combines the high-frequency signal output from the antenna section and a digital modulated signal output from the sensor section, and then outputs the resultant composite signal to a coaxial cable.
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Citations
10 Claims
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1. A sensor unit for mounting on a mobile unit, the sensor unit comprising:
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an antenna section including at least an antenna element for receiving a high-frequency signal from an external positioning system; a sensor section including at least a gyro sensor for detecting an angular velocity of the mobile unit and an acceleration sensor for detecting an acceleration of the mobile unit; a combining circuit including at least a first signal line through which the high-frequency signal output from said antenna section is sent, a second signal line through which a signal output from said sensor section is sent, and a node for generating a composite signal by combining the high-frequency signal from said antenna section and the signal output from said sensor section such that the high-frequency signal and the signal occupy different frequency bandwidths and are output from said node simultaneously, said node being a connection point of said first signal line and said second signal line; and a casing accommodating said antenna section, said sensor section, and said combining circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A locating unit for connecting to a sensor unit and mounting on a mobile unit, wherein
the sensor unit sends a composite signal obtained by combining a high-frequency signal transmitted from an external positioning system and a digital modulated signal obtained by modulating a carrier with a data unit including at least angular velocity data indicative of an angular velocity of the mobile unit in a digital format and acceleration data indicative of an acceleration of the mobile unit in a digital format, the locating unit comprising: -
a dividing circuit for dividing, in response to reception of the composite signal sent from the sensor unit, the received composite signal into the high-frequency signal and the digital modulated signal; a receiver for performing, in response to reception of the high-frequency signal obtained through division by said dividing circuit, a predetermined process on the high-frequency signal and calculating a current position of the mobile unit; a digital demodulator for demodulating the digital modulated signal obtained through division by said dividing circuit and reproducing the data unit; and a processor for deriving an azimuth angle and a travel distance of the mobile unit from the angular velocity data and the acceleration data included in the data unit reproduced by said digital demodulator and calculating a current position of the mobile unit by using the azimuth angle and the travel distance. - View Dependent Claims (9, 10)
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Specification