JPH06338815A - Long distance one-way communication system using specific small power radio equipment - Google Patents

Abstract

PURPOSE:To perform long distance unidirectional communication for every kind of data and information by using a specific small power receiver with transmission output 10mV as it is, using a high gain antenna for reception, and using a pre-amplifier with low noise factor before a reception main amplifier. CONSTITUTION:A transmission part 1 is mainly comprised of a personal computer 100, a transmitter 101, and an antenna 102 for transmission, and a specific small power radio transmitter/receiver with transmission output 10mV is used as it is. The transmitter 1 sends data inputted to the personal computer 100 to the transmitter 101 as a data signal, and performs one-way communication via the antenna 102. A receiver 2 receives transmitted data signal with the high gain antenna 201, and suppresses a noise via the pre-amplifier 202 with low noise factor. The data signal is demodulated at a signal demodulation circuit 204 via the reception main amplifier 203, and is sent to a personal computer 207 via an output circuit 205, then, it is data-displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long-distance one-way communication system that uses a certified product as it is without changing the specifications of a specific low-power wireless transceiver certified by the Radio Law and having a transmission output of 10 mW. The present invention relates to a communication method that enables long-distance one-way communication of various data and information without the need to obtain a license for a wireless station, regardless of the type or format of the data or information or the protocol.

[0002]

2. Description of the Related Art Conventionally, a wireless communication device has been used between a work boat and a land in order to manage the working condition of the work boat such as dredging. However, ordinary radio transmitters for telemeters must be licensed under the Radio Law.
And this license is mainly a license for each area, and if the area changes, it must be acquired for each area, and if the work boat is used across the country, you must obtain a license for each area. I won't.

For this reason, the use of a specific low-power radio that does not require a license is being considered. When such a specified low power radio is used, modification of the transmission output (10 mW) and specification change are prohibited by the Radio Law. The specific low-power radio transmitter / receiver with a transmission output of 10 mW certified by the Radio Law for both parts was used as it was without changing the specifications.

However, even if the specified low power radio transceiver is used as it is for the transmitter and the receiver, the transmission output is as weak as 10 mW, and the distance attenuation is large when the land and the work boat exceed 1 km. The reception sensitivity was low, and even if it was amplified, the noise was severe and the transmitted signal could not be reproduced, so in the end, it was not actually used in a long distance, but was used only in a short distance of less than 1 Km.

On the other hand, in recent years, a wireless communication system has been used in the transmission of personal computer data, position data by a geodimeter, image transmission to a remote place, data transmission for environmental monitoring, remote operation of working machines in dangerous places, etc. Although required, it is very convenient to use a specific low-power wireless communication system that does not require a license when wirelessly transmitting various data and information in such a case.

However, long-distance communication cannot be performed by using the specified low-power radio as it is for the transmitter and the receiver, so that it is limited to communication between personal computers or between personal computers and printers in a room or on a premises, for example. .

[0007]

Therefore, an object of the present invention is to use a specific low-power radio transceiver that does not require a license for a radio station certified by the Radio Law and has a transmission output of 10 mW, without changing the specifications. Even so, it is an object of the present invention to provide a long-distance one-way communication system using a specific low-power radio that enables low-noise and high-sensitivity reception and is capable of long-distance one-way communication of various data and information.

[0008]

A long-distance one-way communication system using a specific low power radio device according to the present invention which achieves the above object is a specific low power with a transmission output of 10 mW certified by the Radio Law for a transmitting unit. A wireless transceiver is used as it is to unidirectionally transmit a signal from a transmitting antenna, a receiving unit is provided at a position several kilometers away from the transmitting unit, and a weak wireless signal transmitted from the transmitting unit is received by a receiving high-gain antenna. Then, after suppressing and amplifying the noise of the received signal with a low noise figure preamplifier, the main receiving amplifier amplifies the signal to the level required for demodulation, and the signal demodulation circuit demodulates it to the range required for the signal output level, and outputs it. It is characterized by outputting a signal of a constant level to the circuit.

As a result of diligent examination of the above problems, the present inventor has found that conventional recognition has an error. That is, conventionally, the communication distance of the specific low-power radio is several hundred meters to 1 km at best.
It is considered that the device is designed and the protocol is designed based on such a premise, and it is considered that the device is not suitable for long-distance communication, which is a common sense.

However, as a result of examining the relationship between the communication distance and the electric field strength by the theory of radio wave propagation and various nomographs, it was found that an electric field capable of sufficiently performing the above long distance communication can be obtained.

That is, the electric field strength within the line-of-sight distance on the sea is determined under the following conditions by some nomographs relating to radio wave propagation.

(Conditions) The distance to be investigated for communication is set at two points of 5 km and 8 km, the height of the transceiver (that is, the transmitting antenna) is set to 2 m above sea level, and the height of the receiving antenna is set to 10 m above sea level. And use frequency of 429M
Hz band (for telemetry and telecontrol of specific low power radio), and transmission output was 10 mW (transmission output of specific low power radio).

(Electric field strength) From the "minimum effective antenna height" nomograph shown in FIG.

[0014]

[Outer 1] Here, h ₁ ¹ represents the transmitting antenna equivalent height, and h ₂ ¹ represents the receiving antenna equivalent height.

Then, when the electric field strength at the 5 km point is obtained, it becomes -116 dB from the nomograph of "reception power on the plane ground when radiating 1 W" shown in FIG. 2, and it becomes -156 dB because the transmission output is 10 mW. .

Further, under the condition of the frequency of 429 MHz, the electric field strength at the receiving point is about 5 dB from the nomograph shown in FIG. (1 μV / m = 0 dB, so
The received signal is 1.7 μV / m. ) From the above examination results, it is possible to sufficiently receive signals with an electric field strength of about 5 dB under the above conditions.
When receiving using a high gain receiving antenna of dB,
Since it is considered that the received signal of 3 μV / m or more can be supplied to the receiving unit, it was found that a high S / N ratio can be obtained.

Similarly, when the electric field strength at the 8 km point is obtained, it becomes about -4 dB, and in order to receive this with a sufficiently good S / N ratio, in the configuration of the present invention, for example, 6 dB.
It is presumed that it can be used if it is supplied to the receiving section by using the high gain antenna and the preamplifier having a good S / N ratio.

That is, according to the present invention, the transmitter / receiver including the antenna is integrally formed in the specified low power radio, and the condition for approval is that the transmitter / receiver does not change the electrical and mechanical specifications of the device. Therefore, it is not possible to change the antenna to increase the reach or increase the transmission output. For this reason, a specific low-power radio transmitter / receiver with a transmission output of 10 mW certified by the Radio Law was used as it was in the transmitting unit without changing the specifications, and the communication system was continuous one-way communication.

Further, in the present invention, the specific low-power radio transceiver having a transmission output of 10 mW certified by the Radio Law as described above is used as it is in the transmitting section without changing the specifications. Since the signal is extremely weak, an antenna with a high gain was used for reception, and a pre-amplifier with a low noise figure was connected in front of the main receiver amplifier to realize a high-gain receiver with low noise. is there.

Further, in the present invention, it is preferable to select the specific low power radio transmitter / receiver which does not limit the protocol and the signal format so that the applied signal can be transmitted unconditionally.

In the present invention, the number of transmitters and receivers is several Km.
It is installed at a distant position, but here a few km is 1
It is a range of not less than 8 km.

Preferred embodiments of the long-distance one-way communication system of the present invention include the following (1) to (7).

(1) The first mode is an example applied to long-distance personal computer communication. Specifically, data is input from a personal computer containing communication software, and the input signal is certified by the Radio Law. A transmission unit that uses a specific low-power wireless transceiver with a transmission output of 10 mW without changing the specifications (hereinafter,
If necessary, it is referred to as the "transmitting unit of the present invention". ) Is preferably unidirectionally transmitted from the transmitting antenna by a serial transmission method, and the signal transmitted from the transmitting unit is received by a receiving high-gain antenna provided at a position several km away from the transmitting unit, and has a low noise figure. Through the preamplifier, the main reception amplifier, and the signal demodulation circuit, the signal that has reached the predetermined output level is obtained.
This is a communication system in which the output signal is sent to a personal computer and data is displayed on the display.

(2) The second mode is an example applied to a laser rangefinder (geodimeter, etc.), and specifically, a geodimeter having an automatic tracking function is installed at a fixed point (for example, a shore), The data signal at the position of the moving body (for example, the work boat) measured by is unidirectionally transmitted from the transmission antenna of the transmission unit of the present invention, preferably by a serial transmission method, and the data signal is separated from the transmission unit by several kilometers. A preamplifier with a low noise figure, which is received by a high gain antenna for reception installed on a moving body (for example, a work boat) provided in
This is a communication system in which a signal that has reached a predetermined output level is formed via a main receiving amplifier and a signal demodulation circuit, and the output signal is sent to a personal computer to display the position on the display of the personal computer.

(3) The third mode is an example applied to a positioning system using a global positioning system (hereinafter abbreviated as "GPS"), and specifically, GP
Fixed point (that is, base) where S receiver was accurately measured beforehand
Installed as the other GPS receiving device from the transmitting unit for several K
It is mounted on a moving body (for example, a work boat) provided at a position m away from each other, and a reception signal simultaneously received from three or more artificial satellites from the GPS antenna on the fixed point is used as a measurement value of the fixed point. From the transmitting antenna of the transmitting unit, preferably unidirectionally transmitted by a serial transmission method, the measurement signal is received by a high-gain antenna for reception installed on the moving body,
Through the low noise figure preamplifier, the main receiving amplifier, and the signal demodulation circuit, a signal reaching a predetermined output level is obtained, and the output signal is sent to the GPS receiver on the mobile body,
Received signals simultaneously received from three or more artificial satellites on the mobile body from the GPS antenna are sent to the GPS receiver, the measurement error is canceled by measuring the difference from the measurement value of the mobile body, and the measurement error is canceled on the mobile body. It is a unidirectional long-distance communication system that sends the data to the installed personal computer and displays the position on the display more accurately.

(4) The fourth mode is an example applied to an image transmission system. Specifically, the position at which the transmitted image is viewed and the subject of the transmitted image are apart, and the image is transmitted to the image transmission unit. When the position to view the image is several kilometers away, a camera, a still image transmission device capable of band compression, a transmitter, and a transmission antenna are provided in the image transmission unit,
High gain antenna for reception, low noise figure preamplifier,
A receiver having a main receiver amplifier, a signal demodulator circuit, an output circuit, and a reception control circuit is provided, and the receiver and the transmitter of the present invention are provided at a position where the transmitted image is viewed. A control signal for controlling the operation of the camera is input to a transmitter provided at the position for shooting, and one-way communication is performed via a transmitting antenna.

Next, the control signal transmitted by the image transmission unit is received by the receiving high-gain antenna, and the received control signal is transmitted to the preamplifier having a low noise figure, and unnecessary noise is output to output the signal better. Is suppressed and the noise-suppressed control signal is sent to the receiving main amplifier and amplified to a level that can be output, and the amplified control signal is sent to the signal demodulation circuit and demodulated to the range required for the signal output level. , Is sent to the camera via the output circuit, the camera works according to the sent control signal, shoots a subject far from the viewer, and the image shot by the camera is a still image that enables band compression as image information. It is sent to the transmitter via the transmission device and is unidirectionally communicated via the transmitting antenna.

At the position where the transmitted image is viewed, the transmitted image information signal is received by the receiving high-gain antenna, and the received image information signal is sent to the low noise figure preamplifier to improve the signal. Unnecessary noise is suppressed in the output for extraction. The noise-suppressed signal is sent to the receiving main amplifier and amplified to a level that can be output. The amplified image information signal is sent to the signal demodulation circuit and demodulated to the range necessary for the signal output level. The demodulated image information signal is sent to the display via the output circuit,
It is a one-way telecommunications system that displays an image according to the image information sent.

(5) The fifth mode is an example of application to a system for transmitting various sensor information. Specifically, the signals obtained by various sensors are sent to a sensor control signal processing device. From the transmitting antenna of the transmitting unit of the present invention, which is converted into a signal and is provided at a moving point (for example, at sea),
Preferably, a control signal is transmitted by unidirectional transmission by a serial transmission method, and the control signal is received by a receiving high-gain antenna installed on the ground, which is provided at a position several km away from the moving point, and has a low noise figure. This is a one-way long-distance communication system in which a signal reaching a predetermined output level is transmitted through a preamplifier, a main receiving amplifier, and a signal demodulation circuit, and the output signal is sent to a personal computer and output by an output device of the personal computer.

(6) The sixth aspect is an example applied to a remote control system. Specifically, a control signal according to the type of machine control is PCM-modulated by a computer and provided in the control signal transmission section. The control signal is transmitted to the transmitter of the present invention by a unidirectional transmission from the transmitting antenna of the transmitter, and the control signal is received on a controlled object (controlled vehicle) at a remote place several kilometers away. Received by a high gain antenna for use as a signal having reached a predetermined output level through a low noise figure preamplifier, a reception main amplifier, and a signal demodulation circuit, and sends the output signal to each operation unit, and each operation unit While operating the control signal according to the control signal, the operation signal is fed back from each operation part, PCM-modulated, and the controlled object (controlled vehicle)
A feedback signal is transmitted by unidirectional transmission from the transmission antenna of the transmission unit of the present invention installed above, and the feedback signal is received by the reception high-gain antenna installed in the control signal transmission unit, and a preamplifier with a low noise figure, A signal that has reached a predetermined output level is output via the main receiving amplifier and the signal demodulation circuit, and the output signal is sent to various control signal transmission units for arithmetic control, and the feedback signal is also sent to the display, This is a unidirectional long-distance communication system characterized by displaying the status of the controlled side.

(7) The seventh mode is an example of use as a relay device. Specifically, a signal is transmitted from the transmitting antenna of the transmitting unit of the present invention by unidirectional transmission, and the signal is transmitted from the transmitting unit. Received by a high-gain antenna for reception installed at a relay point at a remote place Km away, and through a low noise figure preamplifier, main receiver amplifier, and signal demodulation circuit, a signal that has reached a predetermined output level is obtained, The unidirectional long-distance communication method is characterized in that the output signal is sent to a transmitting unit of the present invention installed near the receiving unit to be retransmitted as a transmitting signal and received at a final receiving point.

[0032]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 This embodiment is an example in which the present invention is applied to long-distance personal computer communication, and FIG. 4 is a block diagram showing the example.

In FIG. 4, reference numeral 1 denotes a transmitter, which is mainly composed of a personal computer 100 (containing communication software), a transmitter 101, and a transmitting antenna 102. Transmitter 1
Is configured without changing the specifications of a specific low-power radio transmitter / receiver with a transmission output of 10 mW that is certified by the Radio Law, that is, using a certified product as it is.

For the transmitting unit 1, it is preferable to select a wireless device which does not limit the protocol and the format of the signal so that the applied signal can be transmitted unconditionally.

Further, it is preferable to attach an antenna dome to the transmitting antenna 102 to enable outdoor use.

Reference numeral 2 denotes a receiver, which is several K from the transmitter 1.
It is provided at a position separated by m. Reference numeral 201 is a high-gain antenna for receiving a weak radio signal transmitted from the transmitting antenna 102 of the transmitting unit 1, and a ground plane antenna is used, for example. Reference numeral 202 denotes a low noise figure preamplifier for suppressing the noise of the received signal. 20
Reference numeral 3 is a main receiving amplifier for further amplifying a signal in which noise is suppressed, and 204 is a signal demodulating circuit for demodulating to a range necessary for the signal output level. Reference numeral 205 is an output circuit that outputs a signal, and 206 is a reception control circuit that functions to switch the frequency and keep the reception sensitivity constant. Two
A personal computer 07 has communication software.

The data input to the personal computer 100 in the transmitter 1 is sent to the transmitter 101 as a data signal. The transmitted data signal is unidirectionally communicated via the transmitting antenna 102.

In the receiving section 2, the data signal transmitted from the transmitting section 1 is received by the receiving high gain antenna 201,
The received data signal is sent to the low noise figure preamplifier 202 to suppress unwanted noise at the output in order to better extract the signal. The noise-suppressed data signal is sent to the reception main amplifier 203 and amplified to a level that can be output. The amplified data signal is sent to the signal demodulation circuit 20.
4 and demodulated to the range required for the signal output level,
It is sent to the personal computer 207 via the output circuit 205 and the data is displayed. Reception main amplifier 203, signal demodulation circuit 204
The output circuit 205 is controlled by the reception control circuit 206. Specifically, frequency switching and control for keeping the receiving sensitivity constant are performed.

The above personal computer communication is carried out over long distances on land,
Alternatively, it can be applied to communication between personal computers provided between long-distance land and sea or long-distance sea, but can also be applied to various data transmission other than personal computer data transmission.

Embodiment 2 This embodiment is an example applied to a laser range finder (geodimeter), and a block diagram showing the example is shown in FIG.

In FIG. 5, 3 is a fixed point, 4 is a fixed point 1.
Is a moving point several kilometers away from. In this embodiment, the fixed point is the coast and the moving point 4 is the work boat.

Reference numeral 103 is a geodimeter provided at the fixed point 3 and having an automatic tracking function. Transmitter 1 at fixed point 3
01 and the transmitting antenna 102.

The work boat 4 is provided with the receiving unit 2 similar to that of the first embodiment. Reference numeral 208 is a personal computer and 209 is a display.

Geogeometer 103 installed at fixed point 3
Set and enter the reference line of. Since the geodimeter 103 has an automatic tracking function, it automatically tracks the work boat 4 and measures its position. The measured position data is sent to the transmitter 101 as a position data signal. The transmitted position data signal is unidirectionally communicated via the transmitting antenna 102.

The transmitted position data signal is received by the receiving high gain antenna 201 mounted at the moving point 4,
Unnecessary noise is suppressed in the output in order to better extract the signal sent to the low noise figure preamplifier 202. The noise-suppressed position data signal is sent to the main reception amplifier 203 and amplified to a level at which it can be output. The amplified position data signal is sent to the signal demodulation circuit 204 and demodulated to the range necessary for the signal output level, and the demodulated position data signal is sent to the personal computer 208 via the output circuit 205. The position of the moving point 4 is displayed on the display 209 by the position data signal sent to the personal computer 208.

This aspect can also be applied to a rangefinder such as a lightwave rangefinder or a total station. When applied to Polarix, another set of the unidirectional long distance communication system of the present invention may be added.

Embodiment 3 This embodiment is an example applied to a GPS positioning system, and a block diagram thereof is shown in FIG.

In FIG. 6, the GPS antenna 104 is installed at the fixed point 3 which is measured accurately. GPS antenna 1
At 04, signals transmitted from three or more artificial satellites 5 are simultaneously received. The received signal is sent to the GPS receiver 105, and the measurement value of the fixed point 3 is obtained. Measured value is transmitter 101
Sent to. The transmitted measurement signal is the transmission antenna 102.
One-way communication in real time via.

The mobile unit 4 receives the transmitted measurement signal by the receiving high-gain antenna 201 mounted therein. The received measurement signal is sent to the low noise figure preamplifier 202 to suppress unwanted noise at the output in order to better extract the signal. The noise-suppressed measurement signal is sent to the reception main amplifier 203 and amplified to a level at which it can be output. The amplified measurement signal is sent to the signal demodulation circuit 204 and demodulated to the range necessary for the signal output level. The demodulated measurement signal is sent to the GPS receiver 21 via the output circuit 205.
Sent to 1.

In the mobile unit 4, the GPS antenna 210 simultaneously receives signals transmitted from three or more artificial satellites 5. The received signal is sent to the GPS receiver 211, and the difference between the measurement value of the moving body 4 and the measurement value of the fixed point 3 is obtained.

In the GPS receiver 211, the measured value of the GPS measurement system transmitted from the above-mentioned transmitting point of the fixed point 3,
Subtract the above measured values to cancel the error of GPS measurement,
Calculate more accurate position data. The calculated position data is processed by the personal computer 212 and displayed on the display 213.
And the position of the moving body 4 is displayed.

Embodiment 4 This embodiment is an example in which the long-distance one-way communication system of the present invention is applied to an image transmission system, and a block diagram thereof is shown in FIG.

In FIG. 7, 6 is an image transmitting unit, 7 is a position where the transmitted image is viewed, and 8 is a subject of the transmitted image.
Here, the position 7 where the transmitted image is viewed and the subject 8 of the transmitted image are apart from each other, and the image transmission unit 6 and the position 7 where the transmitted image is viewed are apart from each other by several Km. 107 is a camera included in the image transmission unit 6, 301 is a still image transmission device capable of band compression, 101 is a transmitter, and 102 is a transmission antenna.

In addition to the above, the image transmitting section 6 has a receiving high-gain antenna 20 used in the receiving section of the present invention.
1. Low noise figure preamplifier 202, receiving main amplifier 20
3, a signal demodulation circuit 204, an output circuit 205, and a reception control circuit 206 are installed.

Further, at the position 7 where the transmitted image is viewed, the receiving unit and the transmitting unit of the present invention are provided, and the receiving unit has a receiving high gain antenna 201, a low noise figure preamplifier 202, and a receiving main amplifier 203. , The signal demodulation circuit 204,
It has an output circuit 205, a reception control circuit 206, a still image transmission device 301, and a display 214.

Further, the transmission section has a transmitter 101 and a transmission antenna 102, and the image transmission section 6 is provided in the transmitter 101.
Input a control signal to control the operation of. The input control signal is unidirectionally communicated via the transmitting antenna 102.

In the image transmission section 6, the transmitting antenna 102
The control signal thus transmitted is received by the receiving high-gain antenna 201. The received control signal is sent to a low noise figure preamplifier 202 to suppress unwanted noise at the output for better signal extraction. The noise-suppressed control signal is sent to the main reception amplifier 203 and amplified to a level at which it can be output. The amplified control signal is
The signal is sent to the signal demodulation circuit 204, demodulated to a range necessary for the signal output level, and sent to the still image transmission device 301 via the output circuit 205.

The still image transmission device 301 compares the received control signal with the transmitted control signal to determine the presence or absence of an error.

The image captured by the camera 107 is sent to the transmitter 101 as image information via the still image transmission device 301 capable of band compression. The image information sent to the transmitter 101 is unidirectionally communicated via the transmitting antenna 102.

At the position 7 where the transmitted image is viewed, the transmitted image information signal is received by the receiving high gain antenna 201. The received image information signal is sent to the low noise figure preamplifier 202 to suppress unnecessary noise at the output for better signal extraction. The noise-suppressed signal is sent to the reception main amplifier 203 and amplified to a level that can be output. The amplified image information signal is sent to the signal demodulation circuit 204 and demodulated to the range necessary for the signal output level. The demodulated image information signal is sent to the display 214 via the output circuit 205 and the still image transmission device 301. The display 214 displays an image according to the image information sent. Images can be displayed in multiple images such as 4 screens, 9 screens and 16 screens.

In the above aspect, the camera may be a television camera or a still camera, and the video output of the television, the output of the VTR and the like can be transmitted.

Embodiment 5 This embodiment is an example in which the long-distance one-way communication system of the present invention is applied to monitoring data transmission, and its block diagram is shown in FIG.

In FIG. 8, 9 is a water facility. 10
Reference numeral 8 denotes various sensors provided in the water equipment 9 for obtaining information. 109 is a sensor control signal processing device. 110 is a battery and 111 is a solar panel.
Both the battery 110 and the solar panel 111 supply electric power to the above-water facility, but only one of them may be used.

Reference numeral 10 is a land facility, which is provided with a receiving high-gain antenna 201. High gain antenna 20
For example, a beam antenna may be used as 1. 215 is a personal computer for processing the transmitted data,
A printer 216 outputs the processed data.

Water quality information is measured by various sensors 108. The measured data is the sensor control signal processing device 1
The signal is converted by 09 and sent to the transmission control device 101. The transmitted data signal is unidirectionally communicated via the transmitting antenna 102.

In the land facility 10, the transmitted high-gain antenna 201 receives the transmitted data signal. The received data signal is sent to a low noise figure preamplifier 202 to suppress unwanted noise at the output for better signal extraction. The noise-suppressed data signal is sent to the reception main amplifier 203 and amplified to a level that can be output. The amplified data signal is sent to the signal demodulation circuit 204.
Sent to and demodulated to the range required for the signal output level. The demodulated data signal is sent to the personal computer 215 via the output circuit 205 for data processing, and then the printer 216.
Sent to and output.

In this embodiment, various sensors include environmental monitoring sensors such as water temperature, salt concentration, pH and turbidity, and tide level sensors.

Embodiment 6 This embodiment is an example in which the long-distance one-way communication system of the present invention is applied to the remote control operation of various machines, and its block diagram is shown in FIG.

In FIG. 9, 11 is a machine control section,
Various control signal transmission units. Reference numeral 112 is an input unit for inputting the type of operation (for example, engine start, engine stop, transmission control, speed control, direction control). Reference numeral 113 is a converter that converts various kinds of input control into analog control signals. Reference numeral 114 is a PCM modulator that modulates an analog control signal into a digital control signal. 115 demodulates the received feedback signal,
It is a feedback signal demodulation discriminator for discriminating. 116
Is a display for displaying the control state of the controlled object.

Reference numeral 12 is a control motion reproducing unit of a machine at a remote place, which has a receiving unit. A control signal demodulation discriminator 217 demodulates and discriminates the transmitted control signal. Two
Reference numeral 18 is a portion for outputting various kinds of signals in the machine control section 11, and 219 is a controlled section which is actually controlled. 220 is a PCM modulator that modulates the analog control signal of the feedback signal into a digital control signal.

In the machine control section 11, the machine control is input to the machine control type input section 112 and converted into an analog control signal by the converter 113. The converted analog control signal is sent to the PCM modulator 114 and modulated into a digital control signal. The modulated digital control signal is sent to the transmitter 101. The sent digital control signal is unidirectionally communicated via the transmitting antenna 102.

In the receiving section, the received high gain antenna 201 receives the transmitted digital control signal. The received digital control signal is a low noise figure preamplifier 20.
2 to suppress unwanted noise at the output for better signal extraction. The noise-suppressed digital control signal is sent to the main reception amplifier 203 and amplified to a level that allows output. The amplified digital control signal is sent to the signal demodulation circuit 204, demodulated to the range necessary for the signal output level, and sent to the control signal demodulation discriminator 217 via the output circuit 205. The sent digital control signal is demodulated to an analog control signal and sent to the steered unit 219 via various signal output units 218 to operate the steered unit 219 according to the analog control signal.

The operating state is sent as a feedback signal to the feedback signal PCM modulator 220 and is modulated into a digital feedback signal. The modulated digital feedback signal is sent to transmitter 101. The sent digital feedback signal is transmitted to the antenna 10 for transmission.
One-way communication is performed via 2.

In the machine control section 11, the control motion reproduction section 12
The transmitted digital feedback signal is received by the receiving high-gain antenna 201. The received digital feedback signal is a low noise figure preamplifier 2
02, which suppresses unnecessary noise at the output to better extract the signal. The noise-suppressed digital feedback signal is sent to the main reception amplifier 203 and amplified to a level at which it can be output. The amplified digital feedback signal is sent to the signal demodulation circuit 204 and demodulated to the range necessary for the signal output level, and the output circuit 20
5 is sent to the feedback signal demodulation discriminator 115 and demodulated into a feedback analog signal.

The demodulated feedback analog signal is sent to the converter 113 and converted into a feedback analog control signal for feedback control. The demodulated feedback analog signal is sent to the display 116 to display the control state of the controlled side.

As described above, the remote operation communication of various machines can be performed, and the machine operation work in a dangerous place can be performed safely.

Embodiment 7 This embodiment is an example in which a relay device is incorporated in the long-distance one-way communication system of the present invention to enable further long-distance communication, and its block diagram is shown in FIG.

In FIG. 10, 13 is a transmission point, 14 is a final reception point, and 15 is a relay point.

An input signal is input to the transmitter 101 at the transmission point 13. The input signal is unidirectionally communicated via the transmitting antenna 102.

The receiving section 2 installed at the relay point 15 receives the transmitted signal by the receiving high-gain antenna 201. The reception signal is sent to the transmitter 101 in the relay point 15 via the low noise figure preamplifier, the main reception amplifier, the signal demodulation circuit and the output circuit in the reception section. The transmitted signal is unidirectionally communicated via the transmitting antenna 102. In the receiving unit 2 installed at the final receiving point 14, the transmitted high-gain antenna 201 receives the transmitted signal. The reception signal is output in the reception unit through the low noise figure preamplifier, the reception main amplifier, the signal demodulation circuit, and the output circuit.

In the above embodiment, when the remote place is farther away, the number of relay devices is increased to enable further long distance communication. The channel used by the transmitter of the relay device is determined by the channel used by the receiver, but if all the receivers use the same channel, the channel of the transmitter will also use the same channel. When using the same channel, in order to prevent, for example, howling, a transmission method and special measures such as reception control are required so that the receiver does not output the same data twice.

Although the embodiments of the present invention have been described above, the present invention is not limited to these, and two sets of long-distance one-way communication systems of the present invention may be alternately combined to perform mutual communication.

[0084]

As is apparent from the above description, according to the present invention, even if a specific low power radio transmitter / receiver that does not require a license for a radio station certified by the Radio Law and has a transmission output of 10 mW is used as it is. It is possible to provide a long-distance one-way communication system using a specific low-power radio that is capable of low-noise and high-sensitivity reception and capable of long-distance one-way communication of various data and information.

[Brief description of drawings]

FIG. 1 is a nomograph showing the minimum effective antenna height.

FIG. 2 is a nomograph showing received power on a plane ground when radiating 1 W.

FIG. 3 is a nomograph showing the electric field strength in free space when the radiant power is 1 W.

FIG. 4 is a block diagram showing an embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a block diagram showing another embodiment of the present invention.

FIG. 8 is a block diagram showing another embodiment of the present invention.

FIG. 9 is a block diagram showing another embodiment of the present invention.

FIG. 10 is a block diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1: Transmitting part 101: Transmitter 102: Transmitting antenna 2: Receiving part 201: Receiving high gain antenna 202: Low noise figure preamplifier 203: Receiving main amplifier 204: Signal demodulating circuit 205: Output circuit 206: Reception control circuit

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[Procedure amendment]

[Submission date] June 4, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 10, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

At the position where the transmitted image is viewed, the transmitted image information signal is received by the receiving high-gain antenna, and the received image information signal is sent to the low noise figure preamplifier to improve the signal. Unnecessary noise is suppressed in the output for extraction. The noise-suppressed signal is sent to the receiving main amplifier and amplified to a level that can be output. The amplified image information signal is sent to the signal demodulation circuit and demodulated to the range necessary for the signal output level. The demodulated image information signal is sent to a display via an output circuit, and is a one-way long-distance communication system for displaying an image according to the sent image information.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

(5) The fifth mode is an example of application to a system for transmitting various sensor information. Specifically, the signals obtained by various sensors are sent to a sensor control signal processing device. From the transmitting antenna of the transmitting unit of the present invention, which is converted into a signal and is provided at a moving point (for example, at sea),
Preferably, a control signal is transmitted by unidirectional transmission by a serial transmission method, and the control signal is received by a receiving high-gain antenna installed on the ground, which is provided at a position several km away from the moving point, and has a low noise figure. Through the preamplifier, the main receiving amplifier, and the signal demodulation circuit, it is determined that the signal has reached a predetermined output level, and the output signal requires information from a personal computer or the like.
It is a unidirectional long-distance communication system that sends the sensor data to required equipment .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

The above personal computer communication is carried out over long distances on land,
Alternatively, the present invention can be applied to communication between personal computers provided between long-distance land and sea and long-distance sea, but can also be applied to various data transmission other than personal computer data transmission. Also the transmitter
Since the signal sent from 1 is omnidirectional, the receiver 2
It is possible to receive a plurality of signals at the same time.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction content]

In the GPS receiver 211, the measured value of the GPS measurement system transmitted from the above-mentioned transmitting point of the fixed point 3,
Subtract the above measured values to cancel the error of GPS measurement,
Calculate more accurate position data. The calculated position data is processed by the personal computer 212 and displayed on the display 213.
And the position of the moving body 4 is displayed. Of the moving body 4
Even if there are multiple numbers, the transmission signals are omnidirectional
Can exhibit the same function.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0064

[Correction method] Change

[Correction content]

[0064] In FIG. 8, 9 Ri water equipment der, quay
Etc. may be installed. Reference numeral 108 denotes various sensors provided in the water equipment 9 for obtaining information. 109 is a sensor control signal processing device. 110 is a battery, 1
11 is a solar panel. Both the battery 110 and the solar panel 111 supply electric power to the above-water facility, but only one of them may be used.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction content]

Water quality information or tides are detected by various sensors 108.
Measure the position information etc. The measured data is signal-converted by the sensor control signal processing device 109 and sent to the transmission control device 101. The transmitted data signal is unidirectionally communicated via the transmitting antenna 102.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0067

[Correction method] Change

[Correction content]

In the land facility 10, the transmitted high-gain antenna 201 receives the transmitted data signal. The received data signal is sent to a low noise figure preamplifier 202 to suppress unwanted noise at the output for better signal extraction. The noise-suppressed data signal is sent to the reception main amplifier 203 and amplified to a level that can be output. The amplified data signal is sent to the signal demodulation circuit 204.
Sent to and demodulated to the range required for the signal output level. The demodulated data signal is processed is sent to via the output circuit 205 for example Pas <br/> Sokon 215 data, then sent to the printer 216 is output.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0068

[Correction method] Change

[Correction content]

In this embodiment, various sensors include environmental monitoring sensors such as water temperature, salt concentration, pH and turbidity, and tide level sensors. See you again
If the upper equipment 10 needs the above data,
It may be on board because it is not. Furthermore, the transmitted signal is omnidirectional
Therefore, there may be a plurality of the onshore facilities 10.

Claims (1)

[Claims] 1. A transmission output 10 certified by the Radio Law for the transmission unit.
A specific low-power wireless transceiver of mW is used as it is to unidirectionally transmit a signal from a transmission antenna, a receiving unit is provided at a position several km away from the transmitting unit, and a weak wireless signal transmitted from the transmitting unit is received. For high-gain antennas for reception, a preamplifier with a low noise figure suppresses and amplifies the noise of the received signal, then the main receiver amplifier amplifies the signal to the level required for demodulation, and the signal demodulation circuit requires the range for the signal output level. A long-distance one-way communication system using a specified low-power radio that is characterized by demodulating up to and outputting a constant level signal to the output circuit.