Device for registration of objects
First Claim
1. A device for registration of a first type of objects, here called registration objects, which move relative to a second type of objects, here called registration places, which registration objects, for example, may be vehicles, and the registration places may be places along a road section passed by the vehicles, which device comprises a plurality of recording units attached one in each registration place or on each registration object, and a plurality of registration transceivers attached one on each registration object or in each registration place, and each recording unit comprising an emitter (20), a receiver (23) and an indication unit (24), and each registration transceiver comprising (a) a frequency converter for converting a first signal received from said emitter to a second signal without adding new energy to the signal, which second signal is frequency shifted by a certain amount relative to the first signal, (b) a coding device to provide said second signal with a code individual for the registration transceiver and (c) an emitter device for emitting said second coded signal, said receiver of the recording unit being adapted to receive said second signal, and its indication unit being adapted to indicate said code, characterized in that said frequency converter comprises a modulator, which modulates the first signal in such a manner, that at least one sideband frequency component is formed, and that the coding device is adapted to provide the frequency component with said code individual for the registration transceiver, preferably by starting and stopping said modulator in accordance with a pattern constituting said code.
0 Assignments
0 Petitions
Accused Products
Abstract
Devices for registration of an object and its movements in relation to another object by means of a high frequency signal transmitted from one of the objects and reflected from the other object, the reflected signal being modulated with an identification code and received back at the first mentioned object where the registration of the code takes place. To separate the reflected signal, from the first transmitted signal the frequency of the reflected signal is changed at the same time as it is reflected, the frequency change of the reflected signal being made in a way which allows the frequency of the reflected signal to be chosen according to wish, and that the frequency of the reflected signal is not equal to any of the stronger harmonic of the fundamental frequency of the first, originally transmitted signal. Thereby the reflected signal can be properly received and detected even though much weaker than the transmitted signal or any of its harmonics.
49 Citations
31 Claims
- 1. A device for registration of a first type of objects, here called registration objects, which move relative to a second type of objects, here called registration places, which registration objects, for example, may be vehicles, and the registration places may be places along a road section passed by the vehicles, which device comprises a plurality of recording units attached one in each registration place or on each registration object, and a plurality of registration transceivers attached one on each registration object or in each registration place, and each recording unit comprising an emitter (20), a receiver (23) and an indication unit (24), and each registration transceiver comprising (a) a frequency converter for converting a first signal received from said emitter to a second signal without adding new energy to the signal, which second signal is frequency shifted by a certain amount relative to the first signal, (b) a coding device to provide said second signal with a code individual for the registration transceiver and (c) an emitter device for emitting said second coded signal, said receiver of the recording unit being adapted to receive said second signal, and its indication unit being adapted to indicate said code, characterized in that said frequency converter comprises a modulator, which modulates the first signal in such a manner, that at least one sideband frequency component is formed, and that the coding device is adapted to provide the frequency component with said code individual for the registration transceiver, preferably by starting and stopping said modulator in accordance with a pattern constituting said code.
-
19. A device for registration of a first type of objects, here called registration objects, which are movable relative to a second type of objects, here called registration places, said registration objects being for example vehicles and said registration places being for example places along a road section passed by said vehicles, said device comprising in combination
(a) a plurality of recording units located one in each registration places (b) each of said recording units comprising a transmitter (20) for transmitting a first signal of constant frequency, (c) a plurality of registration transceivers located one in each of said registration objects for receiving said first signal, (d) each of said transceivers comprising a frequency converter for converting said first signal to a second signal to provide for the transmission of said second signal without adding new energy to the signal, the frequency of said second signal being shifted by said converter by a certain amount relative to the frequency of said first signal, and (e) a coding device (32) in each transceiver for coding said second signal with a code individual to the transceiver, (f) and each recording unit further comprising a receiver (23) tuned to receive said second signal and an indication unit (24) for indicating said code when said second signal is received by the receiver, characterized by the fact that, (g) said frequency converter comprises a modulator, which stepwise and repeatedly alters the phase of said first signal through an angle of 360° - whereby at least one side band is created, which forms said second signal.
- View Dependent Claims (20, 21)
-
22. A system providing for the registration of a first type of objects, here called registration objects, which move relative to a second type of objects, here call registration places, which registration objects, for example, may be vehicles, and the registration places may be places along a road section passed by the vehicles, said system comprises a plurality of recording units attached one in each registration place or on each registration object, and a plurality of registration transceivers attached one on each registration object or in each registration place, each of said recording units having means for transmitting a carrier signal consisting of electromagnetical waves of a constant frequency, and each recording unit also comprising a receiver (23) and an indication unit (24), and each registration transceiver comprising a frequency converter for converting said carrier signal received from said recording unit to a second signal without adding new energy to the signal, which second signal is frequency shifted by a certain amount relative to the carrier signal, a coding device to provide said second signal with a code individual for the registration transceiver, and an emitter device for emitting said second coded signal, said receiver of the recording unit being adapted to receive said second signal, and its indication means being adapted to indicate said code, characterized in that said frequency converter comprises a modulator, which modulates the carrier signal in such a manner that at least one side frequency component is formed, which is greater than other side frequency components formed simultaneously and that the coding device is adapted to provide said one frequency component with said code individual to the registration transceiver, preferably by starting and stopping said modulator in accordance with a pattern constituting said code and that said receiver in the recording unit is adapted to receive said one frequency component and said indication unit is adapted to indicate the code carried by said one frequency component;
- said system also being provided with means for suppressing said other side frequency components that may be formed simultaneously.
-
23. A device for registration of a first type of objects, here called registration objects, which are movable relative to a second type of objects, here called registration places, said registration objects being for example vehicles and said registration places being for example places along a road section passed by said vehicles, said device comprising:
-
(a) a plurality of recording units located one in each registration place and (b) each of said recording units comprising a transmitter (20) for transmitting a first signal of constant frequency, (c) a plurality of registration transceivers located one in each of said registration objects for receiving said first signal, (d) each of said transceivers comprising a frequency converter for converting said first signal to a second signal to provide for the transmission of said second signal without adding new energy to the signal, the frequency of said second signal being shifted by said converter by a certain amount relative to the frequency of said first signal, (e) a coding device (32) in each transceiver for coding said second signal with a code individual to the transceiver, (f) said frequency converter comprises a modulator, which stepwise and repeatedly alters the phase of said first signal through an angle of 360°
whereby a number of sidebands is created,(g) means for utilizing only one of said sidebands as said second signal and providing it with said code, (h) means in said recording units for receiving and decoding said one of said sidebands.
-
- 24. A radio communication system providing for the registration of a first type of objects, here called registration objects, which are movable relative to a second type of objects, here called registration places, and registration objects being for example vehicles and said registration places being for example places along a road section passed by said vehicles, said system comprising a recording unit located at each of said registration places and having means for transmitting a carrier signal of constant pre-selected frequency, and a transceiver located in each of said registration objects for receiving said carrier signal and including (a) a coding device for supplying a coded modulation signal containing a code that identifies the transceiver in which it is supplied and (b) a single sideband modulator for modulating said carrier signal upon its reception with said modulation signal to provide a single sideband signal containing said code and having at least one side frequency component, the frequency of said side frequency component being predetermined and differing from the frequency of said carrier signal, said transceiver further comprising means for emitting said single sideband signal for transmission to said recording unit, said recording unit further comprising a receiver tuned to receive said side frequency component and a unit providing an indication of said code when said side frequency component is received by said receiver.
-
26. A system providing for the registration of a first type of objects, here called registration objects, which are movable relative to a second type of objects, here called registration places, said registration objects being for example vehicles and said registration places being for example places along a road section passed by said vehicles, said system comprising a recording unit located in each of said registration places and having a transmitter for transmitting a first signal of constant frequency, and a registration transceiver located in each of said registration objects for receiving said first signal and comprising (a) a frequency converter for converting said first signal to a second signal without adding new energy to the second signal and (b) an antenna for emitting said second signal for transmission to said recording unit, the frequency of said second signal being shifted by said converter by a certain amount relative to the frequency of said first signal, a coding device in said transceiver for providing said second signal with a code individual to the transceiver, said recording unit further comprising a receiver tuned to receive said second signal and an indication unit for indicating said code when said second signal is received by said receiver, characterized by the fact that said frequency converter comprises a modulator, which stepwise and repeatedly alters the phase of said first signal through an angle of 360°
- whereby at least one sideband is created, which forms said second signal, said modulator comprising a hybrid (Hy), said hybrid having four terminals of which one (Te1) is connected to the antenna of the registration transceiver to receive the first signal from the transmitter of the recording unit and transmit the second, modulated signal back to the receiver of the recording unit and a second terminal (Te2) of said hybrid (Hy) being connected to ground through an energy dissipating resistor (Da) for absorbing the energy of signals of a frequency which are not utilized for the information transmission, while a third terminal (Te3) of said hybrid is connected to ground through a first varactor diode (Di1), the control electrode of said first varactor diode being connected to a source of a pulse train consisting of substantially rectangular pulses, intermixed with periods of the same length as the pulses, and the fourth terminal (Te4) of said hybrid being connected to ground through a second varactor diode (Di2), the control voltage terminal (Dst2) of said second diode being connected to a source of a pulse train consisting of pulses similar to those supplied to the control voltage terminal of said first varactor diode (Di1) but phase shifted 90°
in relation to the latter, a first matching circuit (An1) connected between said first diode (Di1) and said third terminal (Te3), a second matching circuit (An2) connected between said second diode (Di2) and said fourth terminal (Te4), said first and second circuits (An1, An2) being effective to match the impedance of the hybrid to that of the diodes, and a delay line providing a connection between one of said diodes and said hybrid in series with said one of said diodes for phase shifting the signal through that connection by the amount of 45°
.
- whereby at least one sideband is created, which forms said second signal, said modulator comprising a hybrid (Hy), said hybrid having four terminals of which one (Te1) is connected to the antenna of the registration transceiver to receive the first signal from the transmitter of the recording unit and transmit the second, modulated signal back to the receiver of the recording unit and a second terminal (Te2) of said hybrid (Hy) being connected to ground through an energy dissipating resistor (Da) for absorbing the energy of signals of a frequency which are not utilized for the information transmission, while a third terminal (Te3) of said hybrid is connected to ground through a first varactor diode (Di1), the control electrode of said first varactor diode being connected to a source of a pulse train consisting of substantially rectangular pulses, intermixed with periods of the same length as the pulses, and the fourth terminal (Te4) of said hybrid being connected to ground through a second varactor diode (Di2), the control voltage terminal (Dst2) of said second diode being connected to a source of a pulse train consisting of pulses similar to those supplied to the control voltage terminal of said first varactor diode (Di1) but phase shifted 90°
- 27. A system providing two-way radio communication between a first station and at least one additional station wherein one of said first and additional stations is movable relative to the other of said first and additional stations, said system comprising an interrogation unit located at said first station and having means for transmitting a carrier signal of fixed pre-selected frequency, a transmitter-receiver unit at said additional station for receiving said carrier signal and comprising means for supplying an encoding signal and a single sideband modulator for intermittently phase modulating the received carrier signal with said encoding signal to produce at least one intermittent side frequency component in a pattern that constitutes a code for identifying said transmitter-receiver unit, said one side frequency component having a frequency that is predetermined and different from the frequency of said carrier signal, said transmitter-receiver unit further comprising means for effecting the transmission of at least said side frequency component, and said interrogation unit comprising a receiver tuned to receive said side frequency component and means for decoding the received side frequency component to recover said code.
- 29. A system providing two-way radio communication between a first station and at least one additional station wherein one of said first and additional stations is movable relative to the other of said first and additional stations, said system comprising an interrogation unit located at said first station and having means for transmitting a carrier signal of constant pre-selected frequency, a transmitter-receiver unit at said additional station for receiving said carrier signal and comprising means for phase modulating said carrier signal upon its reception with an encoding signal to produce at least one side frequency component in the form of a coded signal that contains a code for identifying the transmitter-receiver unit, the frequency of said side frequency component being predetermined and different from the frequency of said carrier signal, said transmitter-receiver unit further comprising means for effecting the transmission of at least said coded signal, and said interrogation unit comprising receiver means tuned to receive said coded signal and means for decoding the received coded signal to recover said code.
-
31. A system providing two-way radio communication between first and second stations wherein one of said stations is moveable relative to the other, said system comprising an interrogation unit located at said first station and having means for transmitting a carrier signal of constant pre-selected frequency, a transmitter-receiver unit located at said second station for receiving said carrier signal and having means for re-transmitting said carrier signal without adding energy thereto to thus provide for the transmission of said carrier signal from the transmitter-receiver unit, said transmitter-receiver unit further including means for modulating said carrier signal with a modulating signal containing a code to provide for the transmission of said code from the transmitter-receiver unit, and said interrogation unit having receiver means for receiving the thusly modulated carrier signal and for recovering said modulating signal, and means for retrieving said code from the recovered modulating signal, said modulating means comprising a phase modulator that is responsive to said modulating signal for generating at least one side frequency component containing said code and having a predetermined frequency that is different from the frequency of said carrier signal, and said receiver means of said interrogation unit being tuned to the frequency of said side frequency component.
Specification