RU2097783C1 - Transponder of object identification telemetering system - Google Patents

Abstract

FIELD: telemetry, in particular, remote object identification systems, applicable for modulation of received interrogation signal with the aim of giving it the necessary information of the object to be identified and reflecting the amplitude-modulated signal in the direction of the receiving device of the object identification system so as to device useful information on the object; containers, transport facilities, etc! can be used as objects. SUBSTANCE: transponder of object identification telemetering system uses series-connected transceiving antenna 1, matching transformer 2, and rectifier 3, non-linear element 5, permanent storage 4; the output of rectifier 3 is connected to the supply input of permanent storage 4, non-linear element 5 is connected to the output of permanent storage 4 as a load, non-linear element 5 in matching transformer 2 is made as a stabilizer diode, and in rectifier 3 it consists of a series-connected diode and resistor. EFFECT: improved design. 3 cl, 2 dwg

Description

 The invention relates to the field of telemetry and, in particular, to systems for identifying objects at a distance. It can be used to modulate the received requesting signal in order to provide it with the necessary information about the identifiable object and reflect the amplitude-modulated signal in the direction of the receiver of the object identification system to extract useful information about the object. As objects of identification can serve containers, vehicles, etc.

 Known transponder telemetric system for identifying objects (US patent, N 4075632, G 01 S 9/56, H 04 B 1/59, 1976). This device contains a series-connected antenna, a rectifying device, an adjustable load, a voltage stabilizer, a capacitor, a cyclic code generator, a frequency tunable generator and a thermistor.

 The transponder operates as follows.

 The interrogating signal of the reader of the telemetric identification system of objects is received by the antenna of the transponder and fed to its rectifying device. The DC voltage of the rectifier device is used to power the transponder circuits. The voltage regulator serves to maintain the voltage rating in the transponder circuits. At the output of the stabilizer, a capacitor is included that stores energy for the operation of the circuits in the intervals of the low level of the output voltage of the rectifying device during the amplitude modulation process. Adjustable load The modulator of the reflected signal is driven by the output signal of the cyclic code generator and alternately closes the output of the rectifying device through a resistor.

 The impedances of the antenna and the rectifier at the rated load of the latter are matched, and when the output of the rectifier is shorted, they are mismatched, which leads to the modulation of the signal reflected from the antenna of the transponder. The cyclic code generator code depends on the frequency of the tunable generator. In turn, this frequency depends on the resistance of the thermistor, and therefore on the temperature of the identified animal on which the transponder is mounted.

 Known transponder telemetric system for identifying objects, adopted as a prototype of the invention (application EP, N 0254954, G 01 S 13/82, B 61 L 25/04, 1987). This device contains a series-connected antenna, matching transformer, rectifier, adjustable load and read-only memory (ROM) as part of a code generator (KG).

 The transponder converts the signal received by the antenna into a constant voltage, which is supplied to the KG, which generates pulses in accordance with the encoding device. These pulses are fed to the control input of an adjustable load, the impedance of which changes in accordance with the KG pulses arriving at it. A change in the load impedance leads to its disagreement with the antenna impedance, which leads to amplitude modulation of the signal reflected from the antenna of the transponder.

 The combination of binary ones and zeros is individual for each object. The receiver of the telemetry system extracts the information transmitted in the reflected signal, which allows you to identify objects at a distance.

The disadvantages of the analogue and prototype are:
high power consumption by the transponder circuit;
Insufficient modulation depth of the signal reflected from the transponder antenna.

 The technical result of the invention is reduced power consumption by the ROM circuit and an increase in the modulation depth of the signal reflected from the antenna of the transponder.

 This result is achieved due to the fact that the transponder contains a transceiver antenna, a high-resistance transformer, a rectifying device, read-only memory (ROM) and a non-linear element (NLE).

 The antenna, transformer, rectifier and ROM input are connected in series. The ROM output is connected as a load of a nonlinear element (NLE).

 Distinctive features of the invention are: non-linear element and its inclusion circuit.

 The reduced consumption by the transponder circuit is due to the fact that for small values of the pulse voltage at the output of the ROM, the NLE resistance is large and the total ROM consumption, respectively, is insignificant. This allows for further stable charge of the output capacity of the rectifier device.

 An increase in the modulation depth is achieved by the fact that when a certain threshold value of the pulse voltage at the output of the ROM is reached, the NLE resistance decreases sharply, which provides a large difference in the current consumed by the ROM at the moment of pulses and in the pauses between them.

 In FIG. 1 is a structural diagram of a transponder; in FIG. 2 is a structural diagram of a telemetric system for identifying objects.

 In FIG. 1 and 2 designations are introduced: 1 transceiver antenna of the transponder; 2 high resistance transformer; 3 rectifying device (D detector, C capacitor); 4 read-only memory (ROM); 5 nonlinear element (NLE); 6 microwave generator; 7 transceiver antenna of the requesting and reading devices of the object identification system; 8 - transponder; 9 directional coupler (BUT); 10 mixer (cm); 11 - low frequency amplifier (ULF); 12 demodulator (DM).

 Antenna 1 can be made in the form of a half-wave vibrator from a copper conductor on the board.

 Transformer 2 can be made a quarter wave of a copper conductor.

 The rectifying device 3 can be performed on two diodes (D) and a capacitor (C) according to the voltage doubling circuit.

 ROM 4 can be performed on a chip (MS) type KN563RT1.

 NLE 5 can be made in the form of a zener diode for the corresponding voltage or in series connected diodes and a resistor.

 Generator 6 can be assembled according to the scheme of a transistor oscillator.

 Antenna 7 can be made horn.

 Transponder 8 is described above.

 The coupler 9 may be made strip or waveguide.

 The mixer 10 may be assembled on a mixing diode.

 VLF 11 can be assembled on transistors.

 DM 12 can be assembled on a diode.

 The transponder contains an antenna 1, a transformer 2, a rectifying device 3, ROM 4 and NLE 5. The output of the antenna 1 through a transformer 2 is connected to the input of the rectifying device 3, the output of which is connected to the power input of the ROM 4, NLE 5 is connected to the output of the ROM 4.

 When the antenna 1 hits the radiation pattern of the antenna 7 with the generator 6 running, the emf variable is induced at the output of the antenna 1. High-resistance transformer 2 increases the amplitude of the EMF induced in the antenna to the desired voltage value. The rectifying device 3 rectifies this voltage and when the value of this voltage reaches the trigger threshold of the ROM 4, the reading of the code written there begins. At the output of the ROM, the corresponding pulse code sequences inherent in the ROM appear, and therefore the object on which the sensor is installed.

 Under the influence of the pulse voltage in the NLE 5 pulsed current flows. Therefore, a pulse current corresponding to the generated pulse sequence ROM flows in the ROM power supply circuit from the storage capacitor C to the ROM. A change in the current taken from the rectifier in the time interval corresponding to the pulse to the time interval corresponding to the pause between pulses leads to a corresponding change in the input resistance of the rectifier device. In this case, the reflection coefficient from the input of the rectifier device and, consequently, from the antenna 1 connected through a transformer 2 to the input of the rectifier device 3 changes.

Claims (3)

 1. A transponder of a telemetry identification system of objects, comprising a serially connected transceiver antenna, matching transformer and rectifier, non-linear element, read-only memory device, characterized in that the output of the rectifier device is connected to a power input of read-only memory device, the non-linear element is connected to the output of read-only memory device as a load.  2. The transponder according to claim 1, characterized in that the non-linear element is made in the form of a zener diode.  3. The transponder according to claim 1, characterized in that the non-linear element is made of series-connected diode and resistor.

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