JPS62283739A - Microwave data transmission equipment - Google Patents

Abstract

PURPOSE:To realize a mobile body discriminating device having many functions, and to widely utilize it by transmitting and receiving various signals in a time series mode by using only one kind of using signal frequency. CONSTITUTION:A series of signal radiated from an inquiring device 101 are received by the transmitting/receiving antenna 23 of a responsing device 102, domodulated by a demodulator/modulator 24, and transmitted to a power source built-in CPU 27 through a receiving signal line 25. The power source built-in CPU 27 detects the power source start signal S1 of this demodulating signal and starts a power source, and also, if a control signal S2 sent subsequently is a read-out control signal, a data stored in the memory of the power source built-in CPU 27 is fetched successively, and the demodulator/modulator 24 is driven, based on the contents of the data, through a transmission signal line 26. By such driving, a nomodulated wave which is received from the transmitting/receiving antenna 23 subsequently to the control signal S2 is modulated by a read-out data read out of the memory of the power source built-in CPU 27 and radiated from the transmitting/receiving antenna 23 again.

Description

Detailed Description of the Invention 3. Technical Field of the Invention The present invention relates to a microwave data transmission device that transmits and receives information using microwaves.

<Prior Art> Conventionally, there has been a microwave data transmission device having a structure shown in FIG. 2 for transmitting and receiving information using microwaves.

In Fig. 2, the Iri interrogation device, 2 is a response device, and when the interrogation device 1 queries the response device 2 using microwave signal radio waves, the response device 2 queries the fixed information stored inside. A reply is sent to the device 1 using a microwave signal radio wave. The interrogation device 1 includes a signal generator 3 that generates a microwave signal, a transmitting antenna 4 that receives a signal from the signal generator 3 and sends it into the air as a radio wave, and a radio wave sent from the response device 2. A receiving antenna 5 that catches microwaves and a demodulator 6 that demodulates the microwaves from the receiving antenna 5 are provided. The above-mentioned answering device 2 has a receiving antenna 7 that catches all the radio waves sent from the interrogating device 1.
, a demodulator 9 that demodulates the microwaves caught by the receiving antenna 7, a signal generator 10 that generates a carrier wave in the microwave band, and a code generator that permanently stores code information and generates a code information signal. 11, signal generator 10
A mixer 12 (or a modulator may be used) for mixing the carrier wave signal sent from the code generator +1 with the code information signal sent from the code generator +1, and a transmitting antenna 8 for transmitting the output signal of the mixer 12 are provided.

In the conventional microwave data transmission device configured as described above, a signal selected from the signal generator 3 in the interrogation device 1 is transmitted from the transmitting antenna 4 toward the response device 2. This transmission signal is received by the receiving antenna 7 of the response device 2 and then demodulated by the demodulator 9. This demodulated signal functions as a control signal for controlling code generator II and signal generator 10. By controlling the signal after demodulation, the code generator 1! A code information signal is sent from the signal generator 10, and a microwave band carrier wave is sent from the signal generator 10 to a mixer 12, where the microwave band carrier wave is completely modulated by the code information signal. The modulated signal subjected to this modulation is transmitted by the transmitting antenna 8 of the response device 2 into the air toward the interrogation device IK as a radio wave. In the interrogation device 1, the radio waves from the response device 2 are received by the receiving antenna 5, and the fixed information stored in the response device 2 is read by demodulating the radio waves by the demodulator 6.

However, in the above-mentioned microwave data transmission device, a signal generator 10 for transmitting a carrier wave in the microwave band is always required in the response device 2, so a relatively large amount of power is required to drive this signal generator 10. It was equipped with a high capacity power supply. For this reason, the device configuration of the response device 2 has become complicated and large.Also, in the conventional device, equivalent consideration has not been given to changing the stored content of code information in the code generator 11, so it lacks flexibility and is difficult to use. was extremely limited.

Purpose of the present invention The present invention was made to solve the various problems mentioned above, and by making the response device smaller and lighter, it greatly improves the efficiency of installing the response device, and The object of the present invention is to provide a microwave data transmission device that can be used for a variety of purposes.

<Configuration of the Invention> In order to achieve the above object, the present invention provides a transmitting means for transmitting a microwave signal having a modulation period and a non-modulation period, and an interrogation device comprising a receiving means for receiving a wave signal, and a 9-wave signal sent from the interrogation device, and a 9-wave signal sent from the interrogation device, a response comprising a transmitting means for applying modulation to the carrier wave based on the data in the storage unit during the non-modulation period and transmitting the #::;==t microwave signal after the modulation to the interrogation device; It is equipped with a device.

<Embodiment> Hereinafter, an embodiment of the microwave data transmission device according to the present invention will be described in detail using the drawings.

FIG. 1 shows a block diagram of an embodiment of a microwave data transmission device according to the present invention.

+01 is an interrogation device with a transmitter/receiver 21 and a transmitting/receiving antenna 22
Consists of. In addition, +02 is a response device, 23 is a transmitting/receiving antenna, 24 is a demodulator/modulator, 25 is a receiving signal line, 26
is a transmission signal line, and 27 is a CPU with a built-in power supply. Note that the same signal line may be used as the reception signal line 25 and the transmission signal line 26.

Further, FIG. 3 shows a waveform diagram of signal radio waves emitted from the interrogation device 101 to the response device 102. As shown in the figure, the signal radio wave is a power supply start signal Sl.

Control signal S2. and an unmodulated wave (or write data, etc.) S3, and the operation of the microwave data transmission device of 0 or more, which is repeatedly radiated with a period τ, is performed as follows.

First, a series of signal radio waves are emitted from the transmitting/receiving antenna 22 of the interrogation device lot, which repeats at a period τ shown in FIG.

Here, the power start signal S1 is the response device! This is a signal for starting the power of the CPU 27 with a built-in power supply. Here, since the response device 102 has the characteristic of being attached to a vehicle, luggage, etc. and moving, it is not necessary to keep the power on all the time, and it is preferable to respond. In addition, since the interrogation device 101 is used by being fixed at a fixed position such as a parking lot gate or near a robot on a production line, the range where the radio waves emitted by the interrogation device +01 can reach is called the monitoring area. In this case, it is sufficient to start the power supply of the response device +02 only in this monitoring area, and it is possible to save power consumption by minimizing power consumption outside this area.

Next, the control signal S2 following the power activation signal indicates whether the instruction content of the interrogation device 101 is to read data stored in the memory of the CPU 27 with a built-in power supply or to write data to the memory. Built-in CPU27
It is a signal to convey to If this control signal S2 is a read control signal for data in the memory, a constant length unmodulated wave follows this control signal S2, and if this control signal S2 is a write control signal to the memory, a non-modulated wave follows this control signal S2. Write data is sent. Note that the power supply start signal S1
If the CPU is designed so that the CPU only performs the read operation, the read control signal can be omitted.

Here, although Fig. 3 shows how these series of signals are generated by amplitude modulating a carrier wave of frequency f, frequency modulation or phase modulation may be used as a modulation method for this carrier wave of frequency f. do not have.

Now, a series of signals shown in FIG. 3 radiated from the interrogator +01 are received by the transmitting/receiving antenna 23 of the answering device 1°02, demodulated by the demodulator/modulator 24, and transmitted to the CPU 27 with a built-in power supply through the receiving signal line 25. It will be done. CP with built-in power supply
The U27 detects the power source activation signal S1 of the demodulated signal and activates the power source, and the subsequently sent control signal S2 drives the demodulator/modulator 24 based on the data content through read control. By this driving, the control signal S2
Subsequently, the unmodulated wave received from the transmitting/receiving antenna 23 is modulated with the read data read out from the memory of the CPU 27 with a built-in power supply, and is radiated from the transmitting/receiving antenna 23 again. The radio wave modulated by the demodulator/modulator 24 and re-radiated is received by the transmitting/receiving antenna 22 of the interrogation device 101 and demodulated by the transmitting/receiving device 21. On the other hand, if the control signal S2 following the power activation signal Sl is a write control signal, the write data signal sent following the control signal S2 is taken into the CPU 27 with a built-in power supply through the reception signal line 25, and is stored in the memory. It is written and stored in a predetermined area.

Through these series of operations, from the interrogating device 101 to the answering device +0
2, data transmission processing for writing or reading arbitrary information is performed. Also, the response device +02 is the interrogation device 10.
The power consumption is saved by activating the power only when the device exists in the monitoring area of 1, and automatically setting the power to 0FFL and "waiting for 1 activation" at other times.

The operation of the microwave data transmission device of the embodiment has been described above, and FIG. 4 shows an example of a more specific circuit configuration of the CPU 27 with a built-in power supply.

In the figure, 271 is a power source such as a battery or storage battery, and 272 is a C
-Amplifier composed of MOS operational amplifier, etc., 273t/
iC-MOS microprocessor, 274 is a transistor, 275, 276.279 (d resistance, 277 is a C-
A MOS NOR gate, 278 is a capacitor, and 281 is a resonator such as ceramic or crystal.

In FIG. 4, an amplifier 272, a NOR gate 277,
Power is always supplied to the BACK UP terminal of the microprocessor 273. The amplifier 272 and the NOR gate 277 are elements that detect a power supply start signal and start the power supply of the microprocessor 273, and the BACKUP terminal of the microprocessor 273 is a terminal provided for holding storage data stored in the internal RAM. In Although,
The power consumption by these is extremely low, and the power supply voltage is 3V.
Even so, it is about 30 μW at most. The amplifier 272 has sufficient amplification gain and converts the demodulated weak signal into C-M
It is amplified to the voltage level necessary to drive the OS NOR gate 277, and when there is no signal from its output terminal, it is L.
OW level (ground potential) is output. For this purpose, a C-MOS comparator is provided at the output stage of the amplifier 272, although not shown.

Now, refer to ■~■ in Figure 5, CPU 27 with built-in power supply in Figure 4.
This figure shows the voltage waveforms of each part of the circuit. The operation of the built-in power supply CPU 27 will be explained in more detail using the voltage waveform shown in FIG.

The microwave signal from the interrogation device 101 received by the transmitting/receiving antenna 23 (Fig. 5 ■) is demodulated by the demodulator/modulator 4 (Fig. 5 ■) and guided to the amplifier 272 . Here, when there is no signal, the two input terminals of the NOR gate 277 are both at Low level (ground potential), so the transistor 274 is non-conductive, but when the microwave signal is received, the output of the amplifier 272 is The power source start signal shown in FIG. 3 causes the voltage to go high (power supply potential), and the output of the NOR gate 277 goes low, reducing the base voltage of the transistor 274 and turning it on (
As a result, the power supply voltage is applied to the VDD terminal of the microprocessor 273 via the transistor 274 (Fig. 5 ■), and a clock signal begins to be generated at the oscillation frequency of the oscillator 281, and the While charging, a signal that changes from the HL low level to the high level is supplied to the RESET terminal to reset the microprocessor 273. From this point on,
The microprocessor 273 starts operating according to the built-in program, and first sets the output terminal 0UTI to High level. As a result, even if the other input terminal of the NOR gate 277, that is, the output of the amplifier 272 goes to a low level, the output terminal of the NOR gate 277 remains at a low level, so the power supply voltage is supplied to the VDD terminal, and the micro Processor 273 continues to operate. Next, the microprocessor 273 inputs the input terminal I.
The output of the amplifier 272 led to N is monitored according to the built-in program, and if it is determined that the control signal S2 is a read control signal, the output is output from the output terminal OUT 2 of the microprocessor 273 to the microprocessor 273 as shown in FIG. The contents stored inside are sequentially extracted and output to the demodulator/modulator. Further, if the control signal S2 is determined to be a write control signal, the write data S3 following the control signal is sequentially fetched from the input terminal IN and the CPU
stored in memory. The data stored in this memory remains BACK even after the microprocessor 273 is powered off due to non-conduction of the transistor 274.
It is maintained forever by the power supply voltage applied to the UP terminal.

When the above series of operations is completed, the microprocessor 2
73 outputs the output terminal OUT according to its built-in program.
If you set I to Low level (Fig. 5 ■) and then leave it in the idling state without doing anything, the 2 of NOR gate 277
Both input terminals of the transistor are at a low level, and the output of the NOR gate 277 is at a high level, making the transistor 274 non-conductive. Therefore microprocessor 2
73 stops operation. The above is an example of the built-in power supply CPU 273, and various other circuit configurations can be implemented within the scope of the present invention.

Next, a specific example of a mobile object identification device that exchanges data using a microwave data transmission device using the above-described interrogation device and response device will be described. Possible uses for this type of device include production control in factories, warehouse management, parking lot gate control, and entry/exit control. Specifically, in production management within a factory, a small response device is attached to each part flowing on the production line, and an interrogation device is installed near the line to read the data stored in the response device. Information regarding each component that approaches the interrogator is read via the response device, and the flow of the corresponding component on the line is controlled in accordance with that information. In this way, the production of parts can be managed accurately.

<Effects of the Invention> According to the present invention described above, by using only one type of signal frequency and transmitting and receiving various signals in time series, a mobile object identification device having many functions can be realized. It can be used in a wide range of applications.

Moreover, it is possible to realize a very practical system.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a microwave data transmission device according to the present invention, FIG. 2 is a block diagram of a conventional microwave data transmission device, FIG. 3 is a signal waveform diagram, and FIG. FIG. 1 shows a partial circuit configuration diagram, and FIG. 5 shows a signal waveform diagram. In the figure, 21: Transmitting/receiving device 22: Transmitting/receiving antenna 23: Transmitting/receiving antenna 24; Demodulator/modulator 25: Receiving signal line 26: Transmitting signal line 27: CPU with built-in power supply 101: Interrogating device 10
2: Response device agent Patent attorney Takeshi Sugiyama (and 1 other person)

Claims (1)

[Claims] 1. An interrogation device comprising: a transmitting means for transmitting a microwave signal having a modulation period and a non-modulation period; and a receiving means for receiving the microwave signal; Transmission for detecting a microwave signal, applying modulation to the carrier wave based on data in a storage unit during the non-modulation period of the microwave signal, and transmitting the modulated microwave signal to the interrogation device. 1. A microwave data transmission device characterized by comprising a response device having means.