Relative car positioning system using car communication
First Claim
1. A relative car positioning system using car communication comprising:
- GPS receiving means for receiving waves from GPS satellites;
GPS information transmission/reception means for transmitting and receiving GPS information received at said GPS receiving means and data of GPS wave propagation times from the GPS satellites to an own car about all the received satellites, between the own car and cars running nearby through car communication means; and
relative car positioning means by GPS wave propagation time difference for calculating differences between data of GPS wave propagation times at the cars running nearby obtained through GPS information transmission/reception means contained in the cars running nearby and the data of GPS wave propagation time at the own car for the GPS satellites, the wave from which is being received simultaneously by the own car and the cars running nearby, and calculating relative positions of the cars running nearby to the own car position by solving simultaneous equations expressing relations between more than three pieces of GPS wave propagation time differences calculated above and a relative position as an unknown quantity; and
wherein data transmission/reception to/from and communication with the cars running nearby are possible.
1 Assignment
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Accused Products
Abstract
To cancel an error in GPS wave propagation time and calculate a relative position of a car running nearby to the own car position with good accuracy, a relative car positioning system using car communication includes a car communication transceiver, a GPS receiving device, a GPS information transmission/reception device, and a relative positioning device. A relative position is determined by determining a GPS wave propagation time difference from a GPS satellite, a wave of which is received by the car running nearby and the own car in common. The difference between the data of GPS wave propagation time at the car running nearby and the data of GPS wave propagation time at the own car is calculated, and if the number of differences of the GPS wave propagation time is obtained by more than three pieces, a relative position of the car running nearby is calculated by solving simultaneous equations expression the relative position as an unknown quantity.
37 Citations
17 Claims
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1. A relative car positioning system using car communication comprising:
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GPS receiving means for receiving waves from GPS satellites; GPS information transmission/reception means for transmitting and receiving GPS information received at said GPS receiving means and data of GPS wave propagation times from the GPS satellites to an own car about all the received satellites, between the own car and cars running nearby through car communication means; and relative car positioning means by GPS wave propagation time difference for calculating differences between data of GPS wave propagation times at the cars running nearby obtained through GPS information transmission/reception means contained in the cars running nearby and the data of GPS wave propagation time at the own car for the GPS satellites, the wave from which is being received simultaneously by the own car and the cars running nearby, and calculating relative positions of the cars running nearby to the own car position by solving simultaneous equations expressing relations between more than three pieces of GPS wave propagation time differences calculated above and a relative position as an unknown quantity; and
wherein data transmission/reception to/from and communication with the cars running nearby are possible. - View Dependent Claims (2, 3)
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4. A relative car positioning system using car communication comprising:
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GPS receiving means for receiving waves from GPS satellites; GPS information transmission/reception means for transmitting and receiving GPS information received at said GPS receiving means and data of GPS wave propagation times from the GPS satellites to an own car about all the received GPS satellites, between the own car and cars running nearby through car communication means; first relative car positioning means by GPS wave propagation time difference for calculating differences between data of GPS wave propagation times at the cars running nearby obtained through GPS information transmission/reception means contained in the cars running nearby and the data of GPS wave propagation time at the own car for the GPS satellites, the wave from which is being received simultaneously by the own car and the cars running nearby, and calculating relative positions of the cars running nearby to the own car position by solving simultaneous equations expressing relations between more than three pieces of GPS wave propagation time differences calculated above and a relative position as an unknown quantity; second relative car positioning means for calculating a relative position of the cars running nearby to the own car position by catching the cars running nearby by a car radar and detecting relative distances and relative azimuth between the own car and the cars running nearby; and search performance/accuracy improving means for improving the accuracy of relative positioning by increasing detection sensitivity at said second relative car positioning means, increasing importance of a detection and compensating the relative position calculated at said second relative car positioning means by the relative position calculated at said relative car positioning means for the cars running nearby near the relative position calculated at said first relative car positioning means; and
whereindata transmission/reception to/from and communication with the cars running nearby is possible. - View Dependent Claims (5, 6)
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7. A relative positioning system comprising:
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a first GPS receiver which receives information from a plurality of GPS satellites and determines a first wave propagation time, said first propagation time being a propagation time of a wave from at least one GPS satellite, of said plurality of GPS satellites, to said first GPS receiver; a communicator which receives information from nearby GPS receivers, including nearby wave propagation times, said nearby wave propagation times being propagation times of the wave from said at least one GPS satellite, of said plurality of GPS satellites, to each receiver of said nearby GPS receivers; and a calculator which determines the relative position of the first GPS receiver to the nearby GPS receivers by calculating a difference between the first wave propagation time and the nearby wave propagation times, wherein said calculator calculates the relative position by solving simultaneous equations expressing relations between more than three calculations of difference in the first wave propagation time and the nearby wave propagation times. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A relative positioning method comprising the steps of:
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receiving information from a plurality of GPS satellites and determining a first wave propagation time, said first propagation time being a propagation time of a wave from at least one GPS satellite, of said plurality of GPS satellites, to a first GPS receiver; receiving information from nearby GPS receivers, including nearby wave propagation times, said nearby propagation times being propagation times of a wave from said at least one GPS satellite, of said plurality of GPS satellites, to said nearby GPS receivers; and determining the relative position of the first GPS receiver and the nearby GPS receivers by calculating a difference between the first wave propagation time and the nearby wave propagation times, and by solving simultaneous equations expressing relations between more than three calculations of differences between the first wave propagation time and the nearby wave propagation times. - View Dependent Claims (17)
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Specification