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US 5,862,456 AGranted
Vehicle device for data transmission to a stationary beacon, and resultant communication system
AssigneeRobert Bosch GmbH
InventorsFriedrich-Wilhelm Bode, Hans-Juergen Fischer, Hans-Ulrich Rossius, Andreas Vahle
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Abstract
A device of a vehicle for data transmission to a stationary beacon 91), which has a transceiver, comprising an on-board unit (2) with an antenna (6) for receiving a continuous signal (5), broadcast by the beacon (1), and for transmitting the received signal (5) back after modulation with a data signal (i(t)), is characterized in that the signal (7) transmitted back by the on-board unit (2) is a double-sideband signal. In that case, the on-board unit (2) can be designed as extremely simply and in the simplest case comprises a diode (9) connected to the base of the antenna (6).
Claims3
A device of a vehicle for data transmission to a stationary beacon (1), comprising:
- a transceiver, comprising an on-board unit (2) with a single antenna (6) for receiving a high-frequency carrier signal (5) broadcast continuously by the beacon (1) and reflecting said carrier signal, after it has been modulated, back to the beacon;
- modulating means (9, 10), connected to a base portion of said single antenna, for modulating said received carrier signal with a relatively low frequency two-state data signal (i(t)), said modulating means including a controllable impedance (9) connected to said base portion of said antenna (6);
- wherein said controllable impedance is a single diode (9) operable at approximately 5.8 GHz as said high frequency carrier signal, and wherein said single diode (9) responds, by switching is alternately to a blocking or high impedance state and a conductive or low impedance state to (i) a first encoded signal by causing said antenna to output two sidebands of a frequency or phase shift keying signal with a first frequency (f1) indicative of a logical zero, and to (ii) a second encoded signal by causing said antenna to output two sidebands of a frequency or phase shift keying signal with a different second frequency (f2) indicative of a logical one, said first and second encoded signals defining alternate states of said two-state data signal,
- wherein said single diode (9) is switchable back and forth between said blocking or high impedance state and said conductive or low impedance state by pulses of said two-state data signal (i(t));
- and
- wherein said single diode (9) has an anode connected to said base portion of said antenna (6) and a cathode connected to ground.
3 more elements
A communication system comprising:
- a stationary beacon (1) having a transmitting antenna (4) for continuously transmitting a high-frequency carrier signal, a receiving antenna (8), and means (13, 13';
- 14, 14') for separate processing of upper and lower received sideband signals;
- and
- an on-board unit (2) on a vehicle, including
- a transceiver with a single antenna (6) for receiving the high-frequency carrier signal (5) broadcast continuously by the beacon (1) and for reflecting said signal back to said beacon after frequency or phase shift keying modulation with a logically generated two-state data signal (i(t)), and
- modulating means (9, 10), connected to a base portion of said single antenna, for modulating said received carrier signal with a relatively low frequency two-state data signal (i(t)), said modulating means including a controllable impedance (9) connected to said base portion of said antenna (6);
- wherein said controllable impedance is a single diode (9) operable at approximately 5.8 GHz as said high frequency carrier signal, and wherein said single diode (9) responds, by stitching alternately to a blocking or high impedance state and a conductive or low impedance state to (i) a first encoded signal by causing said antenna to output two sidebands of a frequency or phase shift keying signal with a first frequency (f1) indicative of a logical zero, and to (ii) a second encoded signal by causing said antenna to output two sidebands of a frequency or phase shift keying signal with a different second frequency (f2) indicative of a logical one, said first and second encoded signals defining alternate states of said two-state data signal,
- wherein said single diode (9) is switchable back and forth between said blocking or high impedance state and said conductive or low impedance state by pulses of said two-state data signal (i(t));
- and
- wherein said single diode (9) has an anode connected to said base portion of said antenna (6) and a cathode connected to ground.
7 more elements
Dependencies are inferred from the claim text.