JP2004013572A - Radio data transmitter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio data transmitter making it unnecessary to perform any troublesome setting at the time of executing radio communication, superior in cost saving performance, and capable of efficiently receiving transmission waves to be transmitted from a plurality of transmission side devices even when there is only one reception side device. <P>SOLUTION: Transmitting parts 1A to 1N transmit ID data to be uniquely applied to a transmitting part to a receiving part 2 with transmission waves. The transmitting parts 1A to 1N are provided with measuring functions with temporal correlation. A control part 11 sets an irregular transmission timing based on the multiplication of random numbers generated by using the ID data of the transmitting part as a seed value and the ID data. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless data transmission device, and in particular, does not require troublesome settings when performing wireless communication, is excellent in cost saving, and is transmitted from a plurality of transmission devices even if only one reception device is used. The present invention relates to a wireless data transmission device capable of efficiently receiving a transmitted wave.
[0002]
[Prior art]
Conventionally, telemetering that collects data such as temperature and humidity, transmits it with transmission waves such as ultrasonic waves, infrared rays, radio waves, etc., receives it at a receiver installed at a remote location, and analyzes data about the monitoring target Systems are known.
[0003]
As such a telemetering system, a system in which one-way transmission is performed from a transmitting device to a receiving device is disclosed in JP-A-2000-163683.
[0004]
In Japanese Patent Application Laid-Open No. 2000-163683, a transmitting device converts a sensor output input from a sensor into a digital signal, adds a unique ID code to the digital signal, and transmits the digital signal as a transmission wave. The receiving device reads the ID code when receiving the transmission wave, and corrects the sensor output included in the digital signal based on the correction table stored in association with the ID code.
[0005]
According to the telemetering system described above, by performing one-way transmission from the transmitting device to the receiving device, it is possible to collect data on a monitoring target without transmitting a transmission request to the transmitting device. The circuit configuration of the side device and the transmission control can be simplified, and the transmission wave received can be corrected by adding an ID code to the transmission wave.
[0006]
[Problems to be solved by the invention]
However, according to the conventional data transmission method, when a transmitting device is provided for a plurality of monitoring targets, a plurality of transmission waves transmitted by each transmitting device interfere or collide with each other. A pair of a device and a receiving device must be provided, which causes a problem that the cost of the device is increased and communication settings are complicated. Further, when the number of monitoring targets is unspecified and large, the above-mentioned problem becomes significant.
[0007]
Accordingly, an object of the present invention is to provide a wireless communication system that does not require complicated settings, is excellent in cost savings, and can efficiently transmit waves transmitted from a plurality of transmitting devices even if only one receiving device is used. An object of the present invention is to provide a wireless data transmission device that can receive data well.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has ID data for identifying an individual, transmits a transmission wave including the ID data at an irregular transmission timing based on the ID data at the same frequency, and has a timing function. A plurality of transmission units having a temporal correlation with each other,
Provided is a wireless data transmission device including one receiving unit that receives a plurality of transmission waves transmitted from the plurality of transmission units.
[0009]
Further, in order to achieve the above object, the present invention has ID data for identifying an individual, and a transmission wave including the ID data at irregular transmission timing set based on a multiplication of the ID data and a random number. A plurality of transmission units transmitting at the same frequency and having a timekeeping function and having a temporal correlation with each other,
Provided is a wireless data transmission device including one receiving unit that receives a plurality of transmission waves transmitted from the plurality of transmission units.
[0010]
Further, in order to achieve the above object, the present invention has ID data specifying an individual, and the ID data and other data are transmitted at irregular transmission timings set based on the multiplication of the ID data and a random number. A plurality of transmission units transmitting a transmission wave consisting of the same frequency and having a time function and having a temporal correlation with each other,
Provided is a wireless data transmission device having one receiving unit that receives a plurality of transmission waves transmitted from the plurality of transmitting units.
[0011]
According to the wireless data transmission device described above, by setting the transmission timing of the transmission wave irregularly based on the ID data unique to the transmission unit having the timing function, it is possible to use the same frequency to transmit from a plurality of transmission units. The transmitted transmission wave can be received by one receiver.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a wireless data transmission device of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 schematically shows a wireless data transmission apparatus according to an embodiment of the present invention. This wireless data transmission apparatus has a plurality of transmission units (1A to 1A) having a timekeeping function and having a temporal correlation with each other. 1N) to receive a plurality of transmission waves transmitted using the same frequency by a receiving unit 2 provided at a remote location, and the transmitting units 1A to 1N are provided as movable monitoring targets. The receiving unit 2 is provided fixedly. Since the transmission units 1A to 1N have the same configuration, the following description will be made based on the transmission unit 1A.
[0014]
The transmission section 1A transmits ID data uniquely assigned to the transmission section to the reception section 2 by a transmission wave, and includes a transmission timing setting section 10 for setting transmission timing of the transmission wave, and a transmission timing setting section for setting the transmission timing. The control unit 11 is configured to execute a transmission operation of a transmission wave including ID data based on the transmission data, a wireless transmission unit 12 that modulates and amplifies the ID data of the transmission unit to generate a transmission wave, and is connected to the wireless transmission unit 12. Antenna 13 for radiating a transmission wave into the air.
[0015]
FIG. 2 shows a circuit configuration of the transmission unit 1A. The transmission timing setting unit 10 includes an ID storage unit 10A fixedly storing ID data uniquely assigned to the transmission unit, and a random number used for setting transmission timing. It has a random number generator 10B for generating. Further, a memory 14 for storing a program necessary for the transmission operation of the transmission wave, control data such as a transmission interval, and a physical quantity such as temperature and humidity and machine information as other data to be transmitted as the transmission wave are input to the memory 14. A signal input / output unit 15 for reading and writing stored programs and control data; a power supply unit 16 for supplying power to the circuit; a clock unit 17 for generating a time signal; The transmitting section 12 is connected to the transmitting section 12 by an internal bus 18 and housed in a transmitting section main body 19.
[0016]
The ID storage unit 10A is, for example, a non-volatile memory, and in this embodiment, a serial number uniquely assigned to a CPU used as the control unit 11 is used as ID data. In addition to the serial number of the CPU, it is also possible to use other data that can specify the transmission unit.
[0017]
The random number generation unit 10B generates a random number based on a random number generation signal output from the control unit 11. This random number is randomly generated in the range of 0 to 255 by performing an arithmetic process such as a multiplication congruential method on a seed value (seed value). In the present embodiment, the ID data is used as a seed value, and a random number generated thereby varies according to the value of the ID data. The generation cycle is 61124 times to form one cycle.
[0018]
The radio transmission unit 12 converts the ID data into a signal wave by a signal wave generator (not shown), modulates the ASK (Amplitude Shift Keying) by a modulator, amplifies the power required for transmission, and transmits a 315 MHz radio wave from the antenna 13. Send as
[0019]
FIG. 3 shows a circuit configuration of the receiving unit 2, a wireless receiving unit 21 connected to an antenna 20 for receiving a transmitting wave, an ID analyzing unit 22 for analyzing ID data included in the received transmitting wave, and a transmitting wave. A memory 23 for storing programs and control data necessary for the receiving operation of the above, a data storage unit 24 for storing other data than the ID data included in the transmission wave, and reading and storing the other data described above in the memory 23 A signal input / output unit 25 for reading and writing the programmed program and control data, a power supply unit 26 for supplying power to the circuit, and a control unit 27 for controlling each unit of the receiving unit 2 are connected by an internal bus 28. It is housed in the receiving section main body 29.
[0020]
The ID analysis unit 22 inputs a demodulated signal obtained by demodulating the transmission wave received by the wireless reception unit 21, and extracts ID data. The extracted ID data is stored in the memory 23 for each ID. When data other than the ID data is added to the transmission wave, the other data is stored in the memory 23 together with the corresponding ID data.
[0021]
The operation of the wireless data transmission device according to the present invention will be described below with reference to FIGS.
[0022]
(1) Transmission of Transmission Wave FIG. 4 shows an operation flowchart of the transmission unit. The clock unit 17 counts clock pulses of a reference clock generation unit (not shown), and a value determined according to a transmission interval of the transmission wave. Sometimes, a trigger signal is output to the control unit 11. The control unit 11 is activated based on the input of the trigger signal (Step 1), and outputs a random number generation signal to the random number generation unit 10B (Step 2). Upon receiving the random number generation signal, the random number generation unit 10B reads the ID data stored in the ID storage unit 10A, and generates a random number R using the ID data as a seed value (step 3). The random number generator 10B outputs the generated random number R to the controller 11 (Step 4). The control unit 11 multiplies the ID data by the random number R to obtain the transmission timing x of the transmission wave with respect to the start of the control unit 11 (step 5). The control unit 11 counts clock pulses from the start of the control unit 11 and outputs a transmission start signal to the wireless transmission unit 12 when the transmission timing x of the transmission wave comes. The wireless transmission unit 12 transmits a transmission wave based on the transmission start signal (Step 6).
[0023]
Figure 5 shows a timing chart of the activation of the control unit 11 to transmits a transmission wave in the transmission timing x, transmitted from the control unit 11 at time t ₁ in FIG. (A) is started after t _A s A transmission wave is transmitted at timing x. FIG (b) shows the transmission timing of the transmission wave in the transmission operation executed at a transmission interval from the transmission of FIG. (A), t _B seconds after the start control unit 11 at time t ₁ The transmission wave is transmitted at the transmission timing x. FIG (c) shows the transmission timing of the transmission wave in the transmission operation executed at a transmission interval from the transmission of FIG. (B), t _C seconds after the start control unit 11 at time t ₁ The transmission wave is transmitted at the transmission timing x. In this way, the transmission timing x in each transmission operation changes irregularly because the random number multiplied by the ID data differs at the time of occurrence. The above-described operation of calculating the transmission timing is similarly performed for the transmission units 1A to 1N.
[0024]
(2) Reception of Transmission Wave FIG. 6 shows an operation flowchart of the reception unit. The radio reception unit 21 performs ID analysis on the demodulated signal obtained by demodulating the transmission wave (step 1) received via the antenna 20. Output to the unit 22 (step 2). The ID analysis unit 22 extracts the ID data included in the demodulated signal and outputs it to the control unit 27 as an ID data extraction signal (Step 3). The control unit 27 specifies the address corresponding to the ID data extraction signal and stores the ID data extraction signal in the memory 23 (Step 4).
[0025]
FIG. 7 shows a display screen displayed on a display of a computer (not shown) connected via the signal input / output unit 25 based on the ID data extraction signal stored in the memory 23. Are the flag patterns 40A, 40B, 40C, 40D, and 40N indicating the transmitting units 1A to 1N, and the transmitting unit ID data 40a, 40b, 40c, 40d, and 40n displayed in proximity to each of the patterns. An image 42 that systematically shows the flag pattern 41 indicating the receiving unit 2 and the identification data 41a of the receiving unit 2 is displayed. By displaying an image based on the ID data extraction signal in this way, it is possible to quickly grasp the monitoring target (the transmission units 1A to 1N) existing in the reception area of the reception unit 2.
[0026]
When data other than the ID data is added to the transmission wave, the fact that other data is added may be displayed by, for example, blinking the picture of the corresponding flag. In this case, another image indicating the content of other data may be displayed on the display screen by selecting a blinking flag pattern with a pointing device such as a mouse.
[0027]
According to the above-described embodiment, the irregular transmission timing of the transmission wave is set based on the ID data uniquely assigned to the transmission units 1A to 1N and the random number generated by the random number generation unit 10B. The transmission wave can be transmitted from each of the plurality of transmission units at each transmission timing, and the transmission wave can be efficiently received and managed by one reception unit 2. Further, the transmission wave is not limited to the above-mentioned radio wave, but may be another electromagnetic wave capable of wireless transmission such as an ultrasonic wave.
[0028]
When there are a large number (12 or more) of transmission units managed by the reception unit 2, the reception interval of transmission waves in the reception unit 2 becomes short, and each transmission unit has its own (unsynchronized) clock unit inside. Therefore, in an environment where a plurality of transmitters are used simultaneously, the transmitters have a temporal correlation with each other. For example, even if the transmission is set to be mutually exclusive at the initial stage, the transmission timing may overlap with the passage of time and a reception failure may occur, so that a threshold of the random number R is provided to avoid this, When the generated random number R exceeds the threshold, it is preferable to add a delay time to the transmission timing x. In the present embodiment, since about 2400 μsec is required as one transmission time for transmitting 8-bit ID data as a transmission wave, occurrence of a reception failure can be prevented by setting the delay time to twice or more the one transmission time.
[0029]
Further, in the wireless data transmission apparatus based on the variable control of the transmission timing described in the above-described embodiment, since a troublesome transmission / reception setting for performing data transmission is unnecessary, it is necessary to add a transmission unit. Can respond quickly. Further, even if the monitoring target changes depending on the situation, or if the monitoring target is unspecified many, monitoring becomes possible.
[0030]
For example, when a home delivery company has a plurality of delivery vehicles (truck), a transmission unit is mounted for each truck and a reception unit that covers a truck terminal as a reception area is provided. The receiving unit receives a plurality of transmission waves transmitted from the track. As a result, information on the trucks belonging to the truck terminal (location, absence, license plate of return vehicle, return time, etc.) can be collected at the same frequency. In addition, a transmitter is mounted on a large truck that transports luggage between truck terminals, and transmission waves transmitted from the large truck are received by the receiver, so that information on the large truck arriving at the truck terminal (license plate, Trader name, departure place, etc.).
[0031]
Further, it is also possible to adopt a configuration in which the transmission unit is fixed and information is collected by moving the reception unit.
[0032]
For example, a transmission unit is mounted on a machine tool (lathe, drilling machine, milling machine, press machine, etc.) installed in a factory, and the total operation time is transmitted as other data together with ID data. In addition, the receiving unit is mounted on the premises work vehicle that patrols the premises of the factory, and approaches to a distance where transmission waves can be received. The collected total operation time is used as management data for maintenance and inspection. This makes it possible to easily and efficiently collect data on the total operation time even in an installation environment where the user cannot easily approach the machine tool. When a machine tool is added, data can be collected by the receiving unit only by attaching the transmitting unit.
[0033]
Further, when a monitoring target that should be located at a designated place or position is removed, it can be used for detecting the removed monitoring target.
[0034]
For example, a transmitting unit is attached to an exhibit to be displayed in an event such as an exhibition, and the exhibit is arranged so as to be in a receiving area of the receiving unit. The operator monitors the image (see FIG. 7) displayed on the display screen of the computer connected to the receiving unit. This makes it possible to monitor the theft of the exhibit. In this case, monitoring becomes possible only by transmitting ID data from the transmitting unit and receiving the ID data at the receiving unit.
[0035]
【The invention's effect】
As described above, according to the wireless data transmission apparatus of the present invention, the ID data is multiplied by a random number generated as a seed value by a plurality of transmission units having a timekeeping function and having a temporal correlation with each other. Since the irregular transmission timing is set based on the wireless communication, troublesome settings are not required for wireless communication, cost savings, and transmission from multiple transmission side devices even if there is only one reception side device. Transmitted wave can be efficiently received.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a wireless data transmission device according to an embodiment of the present invention; FIG. 2 is a circuit configuration diagram of a transmission unit according to an embodiment of the present invention; FIG. FIG. 4 is a flowchart illustrating a transmission operation of a transmission unit. FIGS. 5A to 5C are timing charts showing irregular transmission timings generated in the transmission unit. 6 is a flowchart for explaining the receiving operation of the receiving unit. FIG. 7 is a state diagram in which an image based on the transmission wave received by the receiving unit is displayed on a display of a computer.
1A to 1N, transmission unit 2, reception unit 10, transmission timing setting unit 10A, ID storage unit 10B, random number generation unit 11, control unit 12, wireless transmission unit 13, antenna 14, memory 15, signal input / output unit 16, power supply Unit 17, clock unit 18, internal bus 19, transmission unit main body 20, antenna 21, wireless reception unit 22, ID analysis unit 23, memory 24, data storage unit 25, signal input / output unit 26, power supply unit 27, control unit 28 , Internal bus 29, receiving part main body 30, display screens 40a to 40n, ID data 40A to 40N, picture 41, picture 41a, identification data 42, image

Claims (7)

A plurality of ID data having an ID data for specifying an individual, transmitting a transmission wave including the ID data at an irregular transmission timing based on the ID data at the same frequency, and having a timekeeping function and having a temporal correlation with each other. A transmission unit;
A wireless data transmission device, comprising: one receiving unit that receives a plurality of transmission waves transmitted from the plurality of transmission units. It has ID data that specifies an individual, has a timekeeping function while transmitting transmission waves containing the ID data at the same frequency at irregular transmission timings set based on the multiplication of the ID data and a random number. A plurality of transmitters having a temporal correlation with each other,
A wireless data transmission device, comprising: one receiving unit that receives a plurality of transmission waves transmitted from the plurality of transmission units. It has ID data for identifying an individual, and transmits a transmission wave composed of the ID data and other data at the same frequency at an irregular transmission timing set based on the multiplication of the ID data and a random number, and measures time. A plurality of transmitting units having a function and having a temporal correlation with each other,
A wireless data transmission device, comprising: one receiving unit that receives a plurality of transmission waves transmitted from the plurality of transmission units. 4. The wireless data transmission device according to claim 2, wherein the transmission unit adds a delay time that is at least twice as long as one transmission time to the transmission timing according to the value of the random number. . The wireless transmitter according to claim 1, wherein the transmitting unit is provided on a movable monitoring target, and the receiving unit is fixedly provided. Data transmission device. The wireless transmission device according to claim 1, wherein the transmission unit is provided on a fixed monitoring target, and the reception unit is provided movably. Data transmission device. 4. The wireless data transmission device according to claim 1, wherein the transmission unit is mounted on an unspecified number of monitoring targets.

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