JPS62283740A - Microwave data transmission equipment - Google Patents

Abstract

PURPOSE:To use the titled equipment for many purposes by detecting a microwave signal in a first polarized wave direction sent out of an inquiring device, giving a modulation based on the data of a storage part, to its carrier wave, at the time of the nomodulated state of the microwave signal in a second polarized wave direction, and transmitting the microwave signal in the second polarized wave direction after the modulation, to the inquiring device. CONSTITUTION:The inquiring device 101 is provided with a transmitter-receiver 102 having a transmitting circuit for transmitting the microwave signal of a waveform as shown in the figure, and a polarized wave separator and synthesizer 14 for transmitting the modulating signal 23 for control of a microwave signal and a nomodulated carrier 24, whose waveform is shown in the figure, by the first and second polarized weves being different from each other (however, the same frequency). The inside of a responder 201 is provided with a polarized wave separator and synthesizer 15 for separating the microwave signal generated from the interrogator 101, in accordance with the polarized wave, a demodulator 16 for demodulating the modulating signal 23, for control a modulator 17 for modulating the nomodulated carrier 24 sent in time series mode subsequently to the modelating signal 23 for the control, and a signal processor 28 constituted of a circuit of a low power consumption of a C-MOS IC, etc., for executing various signal processings.

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, 1 is an interrogator and 2 is a transponder, and when the interrogator 1 interrogates the transponder 2 using a microwave signal,
The transponder 2 transmits fixed information stored therein to the interrogator 1 using a microwave signal. Inside the interrogator I, there is 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 signal that is sent from the transponder 2. a receiving antenna 5 that catches radio waves;
A demodulator: AIIO2 is provided to demodulate the microwaves from the microwave. Inside the transponder 2 are a receiving antenna 7 that catches radio waves sent from the interrogator 2S1, an iU MM device 9 that demodulates the microwaves from the receiving antenna 7, and a signal that generates a carrier wave in the microwave band. A code generator 11 that permanently stores code information and generates a code information signal according to the output of the decoder 9, and a carrier signal sent from the signal generator 10 and the code generator 11 A mixer 12 (or a modulator may be used) for mixing the transmitted code information signal and a transmitting antenna 8 for transmitting the output signal of the mixer 12 are provided.

In the conventional microwave data transmission device having the above configuration, a signal sent from the signal generator 3 of the interrogator I is transmitted toward the transponder 2 from the transmitting antenna 4 of the interrogator I. This transmission signal is received by the receiving antenna 7 of the transponder 2, and then demodulated by the demodulator 9. This demodulated signal functions as a control signal for controlling the code generator 11 and signal generator 10. The demodulated signal sends the code information signal from the code generator +1 and the carrier wave in the microwave band from the signal generator IO to the mixer 12. In the mixing 1312, the carrier wave in the microwave band is sent to the code information signal. Modulated by the signal. This modulated signal with increased modulation is transmitted by the transmitting antenna 8 of the transponder 2 into the air toward the interrogator 7Sl as a Ti wave. In the interrogator I, the radio waves from the transponder 2 are received by the receiving antenna 5.
The above-mentioned transponder 2
Load fixed information stored in advance.

However, in the above-mentioned microwave data transmission device, the signal generator 10 for transmitting a carrier wave in the microwave band is always required in the transponder 2, so this signal generator! It was equipped with a relatively large-capacity power supply drive device capable of driving 0. For this reason, the device configuration of the transponder 2 has become complicated and large.

Purpose> The present invention was made to solve the various problems mentioned above, and by making the transponder smaller and lighter, it greatly improves the convenience of installing the transponder and makes it versatile. The purpose is to provide a usable microwave data transmission device.

<Structure of the Invention> In order to achieve the above object, the present invention provides a microwave data transmission device with a method for transmitting microwave signals having time-series periods in first and second polarization directions that are different from each other. an interrogator comprising: means for detecting a microwave signal in the first polarization direction transmitted from the interrogator; When the microwave signal in the polarization direction is in an unmodulated state, modulation is applied to the carrier wave based on data in the storage unit, and the modulated microwave signal in the second polarization direction is transmitted to the interrogator. The device is equipped with a transponder equipped with a transmitting means for transmitting a signal.

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

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

In the figure, 101 is an interrogator, and the interrogator 101 has a third
A transmitter/receiver 102 having a transmitting circuit for transmitting a microwave signal having the waveform shown in FIG. Four polarization separation/synthesizers are provided for transmission at the same frequency. The above-mentioned mutually different polarized waves specifically include a combination of right-handed circularly polarized waves and left-handed circularly polarized waves, a combination of circularly polarized waves and linearly polarized waves, and a linear part wave in the 0° direction and a 90° A combination of linearly polarized waves in different directions can be considered. A transmitting/receiving antenna 13 for transmitting and receiving microwave radio waves to (or from) the air is connected to the interrogator 101.

Also, 20 is a transponder, and the transponder 20 + internal tone signal 2
a demodulator 16 that demodulates the control modulation signal 23, a modulator 2fl17 that modulates the unmodulated carrier 24 that is subsequently sent in time series, and a module C that performs various signal processing.
- A signal processor 18 composed of a low power consumption circuit such as a MOS [C] is provided. Further, a transmitting/receiving antenna 19 for transmitting and receiving microwave radio waves from (or to) the air is connected to the transponder 201.

Next, the operation of the above microwave data transmission device will be explained in detail.

First, the interrogator 101 sends the microwave carrier A31? As shown in FIG. 3, the signal is modulated by the index signal and transmitted as a radio wave via the transmitting/receiving antenna 13. The control modulation signal shown in FIG. 3 includes a control modulation signal 23 in a first polarization direction (for example, right-handed circular polarization) and an unmodulated carrier 24 in a second polarization direction (for example, left-handed circular polarization). It is a signal that repeatedly appears with a constant period T. When the distance between the interrogator lot and the transponder 201 falls below a certain level, and the received electric field level exceeds a certain level, the radio waves transmitted by the transmitting/receiving antenna 13 are gapped by the transmitting/receiving antenna I9 on the transponder 201 side, and are caught. The resulting signal is separated by a polarization separation/synthesizer I5, and the control modulation signal 23 sent first is demodulated by a demodulator and then sent to a signal processing unit 518. This signal processor 18 is the interrogator 1
When it does not receive a signal from 01, it is in a standby state.

This standby state refers to a state in which power is consumed to the minimum extent necessary to hold information in the RAM inside the signal processor 18, and many circuits are not functional in that they are not supplied with power.

Under such conditions, if you want to read the data information held in the transponder 201, the signal processor 1
8 or 11 to recover the power activation signal 23a of the control signal 23 in FIG. 6, the signal processor detects this signal! 8 shifts to the operating state, and recognizes that data information reading processing is to be performed by detecting the next reading command signal 23b. With this recognition, the CPU in the signal processor 18
The data information stored in the carrier is sent to the modulator I7 only during the following unmodulated carrier 24. The modulation 2; 17 modulates the unmodulated carrier 24 received via the polarization splitter/combiner 15 with the data information. This modulated wave is radiated from the transmitting/receiving antenna 19 toward the interrogator 25101, and the interrogator! 01 is received by the transmitting/receiving antenna 13. Then, the received wave is detected in the transceiver 102 and the data information stored inside the signal processor I8 is extracted.

Next is the transponder 20! When it is desired to change the data information held in the interrogator 10+, the interrogator 10+ transmits the control modulation signal 23 consisting of the microwave signal in the first polarization direction as a radio wave via the transmitting/receiving antenna 13, and then A write data signal 24° consisting of a microwave signal in the same first polarization direction is transmitted from the transmitting/receiving antenna 13 as a radio wave. When the write data signal 24' is transmitted as a radio wave from the transmitting/receiving antenna 13, a response 52
The antenna 19 of No. 01 receives the radio wave, the demodulator 16 demodulates the received signal via the polarization separation/synthesizer 15, and guides the demodulated signal to the signal processor 18. The signal processor 18
At that time, it has already entered the operating state by receiving the power start signal 23a of the preceding control modulation signal 23, and also starts data information change processing by detecting the writing 7'r near unit signal 23b'. Since it recognizes that it will do so, it rewrites the contents of the stored data held in the internal RAM according to the demodulated signal. In the above configuration, an example is shown in which a read command signal is used from the interrogator 101 during the read operation, or the read command signal is used only by detecting the power start signal 23a.
If the PU is designed so that the read operation is delayed, the read command signal can be omitted. Also, instead of using all the interrogators for both writing and reading, some interrogators may be used for reading only.

The microwave data transmission device with the above configuration can be applied to production control in factories, warehouse management, gate control in parking lots, or room entry/exit control using transponders. For example, when used for production control in a factory, a transponder with individual data such as the part code number, processing procedure, transport route, etc. of the parts on the production line inputted into memory in advance is attached to each part. , interrogators are installed at major points i on the production line. The interrogator transmits microwaves to transponders installed in each component flowing on the production line, reads the internal data as described above, and outputs a control signal to control the flow of the line. Since microwaves pass through plastics, water supplies, etc., there is no need to install a transponder on the surface of each part.

- data transmission system can be obtained.

[Brief explanation of the drawing]

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, and FIG. 3 is a signal waveform diagram. 10 in the diagram! Interrogator I02: Transmitter/receiver I3. Transmitting/receiving antenna I4/Polarization separation/synthesizer 19 Transmitting/receiving antenna 20+/Responder agent Patent attorney Koro Sugiyama (and 1 other person) ] Figure 2 Procedural amendment (method) % formula % 2. Name of the invention Microwave data transmission device 3. Person making the amendment Relationship to the case Patent applicant address ■ 545 Osaka-shi Abejugi Nagaike 1 [1122 Number 2
No. 2 - Name (504) Sharp Corporation Representative Haruo Tsuji 4, Agent address U545, 22-22 Nagaike-cho, Abeno-ku, Osaka-shi August 26, 1986 6, Subject of amendment

Claims (1)

[Claims] 1. Transmitting means for transmitting a microwave signal having time series periods in first and second polarization directions that are different from each other, and receiving a microwave signal in a second polarization direction. an interrogator comprising a receiving means; detecting a microwave signal in a first polarization direction transmitted from the interrogator; and a transponder equipped with a transmitting means for applying modulation based on the data in the storage section and transmitting the modulated microwave signal in the second polarization direction to the interrogator. Microwave data transmission equipment.