On-board DSRC apparatus
First Claim
1. An on-board Dedicated short range communication (DSRC) apparatus comprisingan antenna unit mounted on a vehicle, and a body of said on-board DSRC apparatus mounted on the vehicle to be connected to said antenna unit, said body including a transmission and reception units associated with said antenna unit to communicate with the associated one of on-road communication machines that is installed on a travelling road for the vehicle, wherein said body of said on-board DSRC apparatus comprises switch means for operating in response to the presence or absence of a cable which is selectively inserted between said antenna unit and said body of said on-board DSRC apparatus, and changing means for changing the attenuation amount of said transmission and reception units in response to the operation of said switch means, and wherein said changing means corrects the attenuation amount in such a way as to compensate for the fluctuation of the cable loss due to the presence or absence of said cable.
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Accused Products
Abstract
The present invention provides an on-board DSRC apparatus for communicating with the associated one of on-road communication machines, in which the on-board DSRC apparatus is capable of coping readily with the repurchase of a vehicle, and with the change of the preference of a user while maintaining a communication area fixed before and after having changed the type of, the on-board DSRC apparatus, and has high degree of freedom of installation of the body of the on-board DSRC apparatus. A body of an on-board DSRC apparatus which is connected to an antenna unit includes a transmission unit and a reception unit which are associated with the antenna unit. Also, the body of the on-board DSRC apparatus includes switch means for operating in response to the presence or absence of a cable which is selectively inserted between the antenna unit and the body of the on-board DSRC apparatus, and changing means for changing the attenuation amount of the transmission unit and the reception unit in response to the operation of the switch means. The changing means corrects the attenuation amount in such a way as to compensate for the change of the cable loss due to the presence or absence of the cable.
16 Citations
6 Claims
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1. An on-board Dedicated short range communication (DSRC) apparatus comprising
an antenna unit mounted on a vehicle, and a body of said on-board DSRC apparatus mounted on the vehicle to be connected to said antenna unit, said body including a transmission and reception units associated with said antenna unit to communicate with the associated one of on-road communication machines that is installed on a travelling road for the vehicle, wherein said body of said on-board DSRC apparatus comprises switch means for operating in response to the presence or absence of a cable which is selectively inserted between said antenna unit and said body of said on-board DSRC apparatus, and changing means for changing the attenuation amount of said transmission and reception units in response to the operation of said switch means, and wherein said changing means corrects the attenuation amount in such a way as to compensate for the fluctuation of the cable loss due to the presence or absence of said cable.
Specification