JPH0990028A - Moving object identifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently operate a circuit in a responder by transmitting the interrogation wave of an interrogator by performing amplitude modulation on the interrogation wave and obtaining a power supply voltage by boosting a modulated frequency component by means of the responder. SOLUTION: An interrogator 50a transmits a carrier frequency fc to a responder 51a as an interrogation wave by performing amplitude shift keying(ASK) on the frequency fc component with a modulation frequency fm. The interrogation wave from the interrogator 50a is made incident to an antenna 2 and detected by means of a diode 3 and capacity 4 and the carrier frequency fc component of the detected interrogation wave is detected by means of a signal detector 7. On the other hand, the modulation frequency fm component of the detected interrogation wave is boosted by means of a transformer 11, converted into a DC voltage by means of a diode 12 and capacity 6, and supplied to the power terminals of the signal detector 7, a storage circuit 8, and a modulator 9 as a power supply voltage. When, for example, the turn ratio of the transformer 11 and amplitude of the modulation frequency fm are respectively set at 1:3 and 0.5V, the voltage applied across the diode 12 becomes 1.5V.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transponder for a battery-less microwave moving body identifying apparatus, and more particularly to a moving body identifying apparatus capable of efficiently receiving electric power supplied from an interrogation wave.

[0002]

2. Description of the Related Art In a conventional battery-less microwave moving body identifying apparatus, an interrogating wave transmitted from an interrogator to a responder is detected by the responder, and data in the responder is detected according to a recognition symbol or the like. Is read. Based on this data, the interrogation wave undergoes BPSK (binary phase shift keying) modulation or the like and returns to the interrogator as a response wave.

At this time, the transponder detects the microwave from the interrogator, converts it into a DC voltage, and uses it as the power supply voltage of the transponder.

FIG. 5 is a block diagram showing an example of such a conventional batteryless moving body identifying apparatus. FIG.
1 and 2 are antennas, 3 are diodes, 4 and 6 are capacitors, 5 are resistors, 7 is a signal detector, 8 is a memory circuit,
9 is a modulator for performing BPSK modulation, 10 is a coil, 50
Is an interrogator.

Further, 2 to 10 are transponders 51, 3 and 4 respectively.
Is a detection means 52, 5 and 6 are power supply means 53,
Reference numerals 10 and 10 respectively constitute the modulation means 54.

The output of the antenna 2 is connected to the anode of the diode 3, and the cathode of the diode 3 is connected to one end of the capacitor 4, one end of the resistor 5 and the input terminal of the signal detector 7. The other end of the resistor 5 is connected to one end of the capacitor 6 and the power terminals of the signal detector 7, the memory circuit 8 and the modulator 9, respectively.

On the other hand, the output of the signal detector 7 is connected to the memory circuit 8, and the output of the memory circuit 8 is connected to the modulator 9.
The output of the modulator 9 is connected to the antenna 2 and one end of the coil 10. Further, the other end of the capacitor 4, the other end of the capacitor 6 and the other end of the coil 10 are grounded.

The operation of the conventional example shown in FIG. 5 will be described. The interrogation wave from the interrogator 50 is incident on the antenna 2,
The interrogation wave component detected by the diode 3 and the capacitor 4 is detected by the signal detector 7.

On the other hand, the direct current component of the detected interrogation wave is supplied to the power terminals of the signal detector 7, the memory circuit 8 and the modulator 9 as the power voltage by the power supply means 53.

In the signal detector 7, the data in the responder 51 is read out based on the content of the interrogation wave from the interrogator 50, and the interrogation wave is subjected to modulation such as BPSK modulation based on this data and sent to the interrogator 50 as a response wave. Come back.

As a result, it is possible to operate without providing a power source such as a battery in the responder 51, and the power supplied from the interrogator 50 is consumed without being stored, so that a power storage means or the like becomes unnecessary. .

[0012]

However, even if the power supplied to the antenna 2 is sufficient, the output voltage of the power supply means 53 may be insufficient and the circuit in the transponder 51 may not operate. There is a point. Therefore, the problem to be solved by the present invention is to realize a moving object identifying apparatus that can sufficiently operate a circuit in a transponder.

[0013]

In order to achieve the above object, the present invention receives an interrogator, an interrogation wave from the interrogator, and modulates the interrogation wave from the interrogator based on data. In the moving object identification device, which comprises a transponder that re-radiates as a response wave, an interrogator that transmits an amplitude-modulated interrogation wave, an antenna that transmits and receives the response wave and the interrogation wave, and the interrogation wave that is received Detecting means for detecting
Power supply means for boosting the amplitude modulation component of the output of the detection means to supply it as a power supply voltage, a signal detector for detecting the internal signal component of the output of the detection means, and a storage circuit for storing data. And a transponder including modulation means for modulating the interrogation wave based on the data in the memory circuit and re-radiating the interrogation wave as the response wave.

[0014]

[Function] The interrogator wave can be sufficiently operated by amplitude-modulating the interrogator wave and transmitting the interrogator wave to the responder, and boosting the modulation frequency component in the responder to obtain the power supply voltage. Become.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a first embodiment of the moving body identifying apparatus according to the present invention. Where 1-4
6 to 10, 52 and 54 are denoted by the same reference numerals as in FIG.

In FIG. 1, 11 is a transformer, 12 is a diode, 50a is an interrogator, 2-4, 6-12 are responders 51a, and 6, 11 and 12 are power supply means 53a.
Respectively.

The output of the antenna 2 is connected to the anode of the diode 3, and the cathode of the diode 3 is connected to one end of the capacitor 4, the input terminal of the signal detector 7 and one input terminal of the transformer 11.

Further, one output terminal of the transformer 11 is connected to the anode of the diode 12, and the cathode of the diode 12 has one end of the capacitor 6, the signal detector 7, and the memory circuit 8.
And a power supply terminal of the modulator 9, respectively.

On the other hand, the output of the signal detector 7 is connected to the storage circuit 8, and the output of the storage circuit 8 is connected to the modulator 9.
The output of the modulator 9 is connected to the antenna 2 and one end of the coil 10. Further, the other end of the capacitor 4, the other end of the capacitor 6, the other end of the coil 10, the other input terminal and the other output terminal of the transformer 11 are grounded.

The operation of the first embodiment shown in FIG. 1 will be described. For example, the interrogator 50a uses the carrier frequency "f
ASK (amplitude shift k) with modulation frequency "fm" in c "
eying) It is modulated and transmitted as an interrogation wave to the responder 51a.

The interrogation wave from the interrogator 50a is incident on the antenna 2, detected by the diode 3 and the capacitor 4,
The carrier frequency “fc” component of the detected interrogation wave is detected by the signal detector 7.

On the other hand, the internal modulation frequency of the detected interrogation wave "
The fm ″ component is boosted by the transformer 11, converted into a DC voltage by the diode 12 and the capacitor 6 and supplied as a power supply voltage to the power supply terminals of the signal detector 7, the memory circuit 8 and the modulator 9. Further, regarding the following operation Since it is the same as the conventional example, the description is omitted.

For example, the transformer 11 has a winding ratio of "1:".
3 "and the amplitude of the modulation frequency" fm "component is" 0.5 "
If V ”, the voltage applied to the diode 12 is“
It becomes 1.5V ".

Therefore, the circuit in the transponder 51a becomes "0.5".
Even if it does not operate at "V", it can be operated by boosting it to "1.5V".

As a result, the interrogation wave of the interrogator 50a becomes ASK.
The circuit in the responder 51a operates sufficiently by modulating and transmitting the modulated frequency component to the responder 51a and obtaining the power supply voltage by boosting the modulation frequency component in the responder 51a.

In the first embodiment shown in FIG. 1, the interrogation wave from the interrogator 50a is detected and boosted by half-wave rectification, but it may be detected and boosted by full-wave rectification. That is, FIG. 2 is a configuration block diagram showing a second embodiment of the moving body identifying apparatus according to the present invention. However, for simplification, the description of the portion having the same configuration as that of FIG. 1 is omitted.

2, 2, 10, and 12 are shown in FIG.
And 3a and 3b are diodes,
4a and 4b are capacitors, and 11a is a transformer.

Further, 3a, 3b, 4a and 4b are detection means 52a, and 6, 11a and 12 are power supply means 53b.
Respectively.

The output of the antenna 2 is connected to the anode of the diode 3a and the cathode of the diode 3b, and the cathode of the diode 3a is connected to one end of the capacitor 4a, the signal detector 7 and the first input terminal of the transformer 11a.

The anode of the diode 3b has a capacitance of 4
It is connected to one end of b and the fourth input terminal of the transformer 11a. Further, the second and third input terminals of the transformer 11a are grounded.

The operation of the second embodiment shown in FIG. 2 will be described here. The interrogation wave from the interrogator 50a (not shown) is incident on the antenna 2, and the diode 3a and the capacitor 4a,
The full-wave rectification is detected by the diode 3b and the capacitor 4b.

Carrier frequency "f" of the detected interrogation wave
The c ″ component is detected by the signal detector 7 (not shown).

On the other hand, the internal modulation frequency of the detected interrogation wave "
The fm ″ component is boosted by the transformer 11a, converted into a DC voltage by the diode 12 and the capacitor 6, and supplied as a power supply voltage to the power supply terminals of the signal detector 7, the memory circuit 8 and the modulator 9 (both not shown). Further, the following operation is similar to that of the conventional example, and therefore its explanation is omitted.

As a result, a higher power supply voltage can be obtained by detecting the interrogation wave from the interrogator 50a by full-wave rectification and boosting it.

In the embodiment shown in FIGS. 1 and 2, the modulation frequency "fm" component is converted into a DC voltage by half-wave rectification, but it may be converted into a DC voltage by full-wave rectification. That is, FIG. 3 is a configuration block diagram showing a third embodiment of the moving body identifying apparatus according to the present invention. However, for simplification, the description of the portion having the same configuration as that of FIG. 1 is omitted.

In FIG. 3, reference numerals 6 and 11 are the same as those in FIG. 1, and 13 is a diode bridge. In addition, 6, 11 and 13 constitute a power supply means 53c.

The two output terminals of the transformer 11 are respectively connected to the two input terminals of the diode bridge 13,
Two output terminals of the diode bridge 13 are applied to both ends of the capacitor 6.

The operation of the third embodiment shown in FIG. 3 will be described here. The modulation frequency "fm" component of the interrogated wave detected in the same manner as described above is boosted by the transformer 11, converted into a DC voltage by the diode bridge 13 and the capacitor 6, and is used as a power supply voltage by the signal detector 7, the memory circuit 8 and the modulator. 9
(Both are not shown). Further, the following operation is the same as that of the conventional example, and therefore its explanation is omitted.

As a result, by converting the modulation frequency "fm" component into a DC voltage by full-wave rectification, the power supply voltage can be obtained more efficiently.

In each of the above-described embodiments, the interrogation wave transmitted from the interrogator 50a is circularly polarized wave, horizontally polarized wave or vertically polarized wave, but the electric power is transmitted by using the horizontally polarized wave and the vertically polarized wave. May be.

That is, FIG. 4 is a configuration block diagram showing a fourth embodiment of the moving body identifying apparatus according to the present invention. However, for simplification, the description of the portion having the same configuration as that of FIG. 1 is omitted.

4, 6 and 12 are the same as those in FIG. 1, and 3a, 3b, 4a, 4b, 11a and 53b are shown in FIG.
The same reference numerals are given.

In FIG. 4, 1a, 1b, 2a and 2b are antennas, 10a and 10b are coils, and 50b is an interrogator. Further, 3a, 3b, 4a and 4b are detection means 5
It constitutes 2b.

The operation of the fourth embodiment shown in FIG. 4 will be described here. Antenna 1a of interrogator 50a (not shown)
Is an antenna for vertically polarized waves, and ASK is used for vertically polarized interrogation waves.
The data is modulated and transmitted to the responder 51a.

Similarly, an interrogator 50a (not shown).
The antenna 1b is a horizontally polarized antenna, and the vertically polarized interrogation wave is subjected to ASK modulation of opposite phase and transmitted to the transponder 51a.

The vertically polarized interrogation wave from the antenna 1a enters the antenna 2a and is detected by the diode 3a and the capacitor 4a. On the other hand, the horizontally polarized interrogation wave from the antenna 1b is incident on the antenna 2b and detected by the diode 3b and the capacitor 4b. That is, the transponder 51a separates and detects the vertically polarized and horizontally polarized interrogation waves.

Carrier frequency "f" of the detected interrogation wave
The c ″ component is detected by the signal detector 7 (not shown).

On the other hand, the internal modulation frequency of the detected interrogation wave "
The fm ″ component is boosted by the transformer 11a, converted into a DC voltage by the diode 12 and the capacitor 6, and supplied as a power supply voltage to the power supply terminals of the signal detector 7, the memory circuit 8 and the modulator 9 (both not shown). Further, the following operation is similar to that of the conventional example, and therefore its explanation is omitted.

As a result, the transponder 51a separates and detects the vertically polarized and horizontally polarized interrogation waves to transmit twice the power without increasing the peak power of the transmission wave. Will be possible.

[0050]

As is apparent from the above description,
The present invention has the following effects. A moving object that can fully operate the circuit in the transponder by amplitude-modulating the interrogation wave of the interrogator and transmitting it to the transponder, and boosting the modulation frequency component in the transponder to obtain the power supply voltage The device can be realized.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing a first embodiment of a moving body identifying apparatus according to the present invention.

FIG. 2 is a configuration block diagram showing a second embodiment of the moving body identifying apparatus according to the present invention.

FIG. 3 is a configuration block diagram showing a third embodiment of the moving body identifying apparatus according to the present invention.

FIG. 4 is a configuration block diagram showing a fourth embodiment of the moving body identifying apparatus according to the present invention.

FIG. 5 is a configuration block diagram showing an example of a conventional batteryless moving body identification device.

[Explanation of symbols]

 1, 1a, 1b, 2, 2a, 2b Antenna 3, 3a, 3b, 12 Diode 4, 4a, 4b, 6 Capacitance 5 Resistance 7 Signal detector 8 Memory circuit 9 Modulator 10, 10a, 10b Coil 11, 11a Transformer 13 diode bridge 50, 50a, 50b interrogator 51, 51a responder 52, 52a, 52b detection means 53, 53a, 53b, 53c power supply means 54 modulation means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Takai 2-9-32 Nakamachi, Musashino-shi, Tokyo Yokogawa Electric Co., Ltd.

Claims (1)

[Claims] 1. A mobile unit identification comprising an interrogator and a transponder that receives an interrogation wave from the interrogator, modulates the interrogation wave from the interrogator based on data, and re-radiates the interrogation wave as a response wave. In the device, an interrogator that transmits an amplitude-modulated interrogation wave, an antenna that transmits and receives a response wave and the interrogation wave, a detection unit that detects the received interrogation wave, and the amplitude-modulation component of the output of the detection unit. Power supply means for boosting and supplying as a power supply voltage, a signal detector for detecting an internal signal component of the output of the detection means, a memory circuit for storing data, and an interrogation wave modulated based on the data of the memory circuit. And a transponder configured to re-radiate the response wave as a response wave.