Data transmission system and method in ultrashort wave environment

Abstract

The invention relates to the technical field of ultra-short wave communication, in particular to a data transmission system and method in an ultra-short wave environment, a signal emission part converts a text control instruction sent by a console to remote equipment into a transmittable data file, and the data file is transmitted to the remote equipment through a narrowband radio signal; the signal receiving part receives a control instruction data file of a console and sends the control instruction data file to the remote equipment control part; and the far-end equipment control part performs work control on the far-end equipment according to the control instruction data file, and transmits working data of the far-end equipment back to the console in a data mode through narrowband communication, and the working data are displayed on the console. Through ultra-short wave wireless communication, work control of remote sensing, remote measuring, remote control, remote signaling and the like of far-end equipment is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-short wave communication, and in particular to a data transmission system and method in an ultra-short wave environment. Background Art

[0002] Due to its sky wave propagation characteristics, ultra-short wave communication has an irreplaceable position in the communication field that cannot be replaced by other communication means. In daily work, ultra-short wave communication is widely used to transmit voice communication.

[0003] Under existing technical conditions, the bandwidth of narrowband ultra-short wave communication is only 12.5-25kHz. To achieve data transmission in a narrowband communication environment, due to the limited bandwidth, there will be great restrictions on the size and speed of the data to be transmitted. If the data file to be transmitted is too large, the transmission speed cannot meet the work requirements. To transmit data quickly, the content to be transmitted cannot be too much, which forms a contradiction between the size of the data file and the limited bandwidth. Summary of the invention

[0004] The present invention aims to solve the problem that existing narrowband communications cannot effectively realize data transmission, and proposes a data transmission system and method in an ultra-short wave environment to realize wireless data transmission in a relatively low bandwidth.

[0005] To achieve the above purpose, the technical solution adopted is: The present invention provides a data transmission system in an ultra-short wave environment, comprising: The signal transmission part converts the text control instructions sent by the console to the remote device into a transmittable data file and transmits it to the remote device via a narrowband radio signal; The signal receiving part receives the control command data file from the control console and sends it to the remote device control part; The remote device control part controls the operation of the remote device according to the control instruction data file, and transmits the working data of the remote device back to the console in the form of data through narrowband communication, and displays it on the console.

[0006] According to the data transmission system in the ultra-short wave environment of the present invention, further, the signal transmission part includes a CPU DSP A / D control module, a fast phase-locked loop, a voice-coded digital narrowband modulation, an RF / VCO, a dual differential temperature-compensated oscillator, an output power A / D unit, an RF narrowband driving loop, a power driving unit, an orthogonal feedback APC, an APC comparison ring control unit, a MOSE power amplifier, a low-pass filter, an antenna interface electronic switch and an antenna protection loop; After the console issues a work instruction, it is received by the baseband data interface, and the received signal is processed and encoded by the CPU DSP; the CPU DSP A / D control module controls the fast phase-locked loop to lock the frequency. At this frequency, the work instruction is converted into an electrical signal that can be processed by the DSP through the A / D controller by the voice code digital narrowband modulation and RF / VCO, and the DSP performs sampling and encoding processing; the CPU DSP A / D control module controls the dual differential temperature compensated oscillator to generate an oscillation wave of the local signal, which is then handed over to the fast phase-locked loop to lock the working frequency; the oscillation wave is amplified at high frequency by the RF narrowband driving circuit and then input into the power drive unit; The output power is controlled by the CPU DSP A / D control module. The A / D unit sets the output power. The data signal is suppressed by the orthogonal feedback APC and the APC comparison ring control unit to prevent signal distortion. It is input to the power drive unit and superimposed with the oscillation wave to generate an effective radio signal, which is then amplified by the MOS power amplifier. The unnecessary high-frequency signal is filtered out by the low-pass filter, and the useful high-frequency signal is input to the antenna through the antenna protection circuit of the antenna interface electronic switch to transmit the signal outward.

[0007] According to the data transmission system in an ultra-short wave environment of the present invention, further, the CPU is composed of an embedded microcontroller, and the DSP adopts an ASIC chip.

[0008] According to the data transmission system in the ultra-short wave environment of the present invention, further, the signal receiving part includes an antenna, a low-pass filter, a low-noise GaAs field effect tube amplifier, a low-noise amplification loop, a dual differential temperature-compensated oscillator, a fast phase-locked loop, a variable frequency exciter, a ring mixer, a narrow-band intermediate frequency amplifier, an intermediate frequency DSP processor and a CPU DSP A / D control module; When the antenna receives the control command data file, the signal is first filtered through a low-pass filter and sent to a low-noise GaAs FET amplifier, where the signal is amplified at high frequency in the low-noise amplification loop. A dual differential temperature-compensated oscillator generates an oscillation wave at the local end, which is fixed to the required ultrashort wave frequency through a fast phase-locked loop and sent to a variable frequency exciter to enhance the signal of the corresponding frequency. The oscillation wave generated above is sent to a ring mixer and mixed with the signal received by the antenna to generate an effective signal. The effective signal is sent to a narrow-band intermediate frequency amplifier for effective signal amplification, and then D / A conversion is performed by an intermediate frequency DSP processor, which is transmitted to the DSP via the bus, and the wireless signal is decoded to obtain the control command from the console.

[0009] According to the data transmission system in the ultra-short wave environment of the present invention, further, the remote device control part includes a remote device, a narrowband communication interface matcher, a communication protocol converter and a PLC-S7 series A / D-RS485 programmable controller; After receiving the control instruction data file of the signal receiving part, the control instruction is transmitted from the receiver to the communication protocol converter through the narrowband communication interface matcher, and then sent to the PLC-S7 series A / D-RS485 programmable controller. The controller controls the operation of the remote device by connecting the working current of the remote device.

[0010] According to the data transmission system in the ultra-short wave environment of the present invention, further, when data needs to be returned, the remote device reversely transmits the working data under the control of the PLC-S7 series A / D-RS485 programmable controller and returns it to the console for display.

[0011] Furthermore, the present invention also provides a data transmission method in an ultra-short wave environment, which is implemented based on the above-mentioned data transmission system in an ultra-short wave environment, and includes: Convert text control instructions sent by the console to the remote device into a transmittable data file, and transmit it to the remote device via a narrowband radio signal; Receive the control command data file from the console and send it to the remote device control part; The remote device is controlled according to the control instruction data file, and the working data of the remote device is transmitted back to the control console in the form of data through narrowband communication and displayed on the control console.

[0012] The beneficial effects achieved by adopting the above technical solution are: The present invention solves the data transmission requirements in the ultra-short wave narrowband communication environment encountered in the daily work of the power industry, and realizes wireless data transmission in a relatively low bandwidth. Through ultra-short wave wireless communication, remote sensing, telemetry, remote control and remote communication of remote equipment can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention, wherein the drawings are only used to illustrate some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0014] Figure 1 is a schematic structural diagram of a signal transmitting part of an embodiment of the present invention; Figure 2 is a schematic structural diagram of a signal receiving part of an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the remote device control part of an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings of specific embodiments of the present invention to clearly and completely describe the exemplary scheme of the embodiment of the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention should be the common meanings understood by people with ordinary skills in the field.

[0016] This embodiment discloses a data transmission system in an ultra-short wave environment, which mainly uses narrowband wireless communication technology to control a remote device from a local location and transmit the data of the remote device back to the local location. The system includes a signal transmitting part, a signal receiving part and a remote device control part. The remote device can be an electric meter, a switch that realizes a certain function, a temperature information collection device or a GIS information collection device. The operating frequency of the system uses the operating frequency of ultra-short wave communication 400MHz-420MHz. These three parts are introduced in detail below.

[0017] 1. Signal transmission part like Figure 1 As shown in the figure, the signal reflection part converts the text control instructions sent by the console to the remote device into a transmittable data file, which is transmitted to the remote device via a narrowband radio signal. In this part, the text or voice instructions sent from the console need to be converted into digital signals first, and after mixing, the signal is frequency modulated and amplified, and then transmitted through the antenna feed system in the form of a radio frequency signal.

[0018] The signal transmission part includes CPU DSP A / D control module, fast phase-locked loop, voice-coded digital narrowband modulation, RF / VCO, dual differential temperature-compensated oscillator, output power A / D unit, RF narrowband drive circuit, power drive unit, orthogonal feedback APC, APC comparison ring control unit, MOSE power amplifier, low-pass filter, antenna interface electronic switch and antenna protection circuit.

[0019] After the console issues a work command, it is received by the baseband data interface (this interface can be a USB or COM interface), and the received signal is processed and encoded by the CPU DSP. Preferably, the CPU is composed of an embedded microcontroller (Microcontroller Unit), model CH32F103C8T6, which changes the original text commands that take up a lot of space into shorter compressed files.

[0020] The CPU DSP A / D control module controls the fast phase-locked loop (fast PLL) to lock the frequency. At this frequency, the voice-coded digital narrowband modulation and RF / VCO convert the working instructions through the A / D controller into electrical signals that can be processed by the DSP. The DSP signal processor is completed by the ASIC chip. Its task is to sample and encode the signal transmitted by the A / D controller, and use a higher sampling frequency as much as possible to make a RF waveform smoother, so that the signal will not cause unnecessary signal loss due to other factors during the transmission process.

[0021] The CPU DSP A / D control module controls the dual differential temperature compensated oscillator to generate an oscillation wave of the local signal, which is then locked to the operating frequency by a fast phase-locked loop. The oscillation wave is amplified at high frequency by the RF narrowband driving circuit and then input to the power drive unit.

[0022] The CPU DSP A / D control module controls the output power. The A / D unit sets the output power. The data signal is suppressed by the orthogonal feedback APC and the APC comparison ring control unit to prevent the signal from being distorted. It is input to the power drive unit and superimposed with the oscillation wave to generate an effective radio signal, which is then amplified by the MOS power amplifier. The unnecessary high-frequency signal is filtered out by the low-pass filter, and the useful high-frequency signal is passed through the antenna protection circuit of the antenna interface electronic switch to reach the power that can be transmitted outward, and then input to the antenna to transmit the signal outward.

[0023] During the signal transmission process, since the transmission needs to be protected against power negative feedback, the negative feedback signal needs to be filtered through the antenna protection circuit and not returned to the transmitter. In addition, in order to prevent the transmitter from being in a state of continuous transmission, an antenna interface electronic switch needs to be added to the antenna interface. After the transmission signal is formed, the switch is turned on to allow the effective signal to be transmitted through the antenna.

[0024] The main work of this part is to use the CPU chip, DSP chip and A / D control module. The working speed of this part of the equipment directly determines the timeliness of signal transmission. The processing speed of the DSP chip determines the smoothness and reliability of the radio waveform. Digital signal processing is an important part of analog radio waveforms. The smoother the waveform, the higher the reliability of the signal and the stronger the anti-interference ability during transmission.

[0025] For the antenna part, use a high-gain omnidirectional antenna and place it as high as possible. Because the remote device is not located in a straight line, an omnidirectional antenna is used to allow the signal to be transmitted in more directions. The antenna used in this embodiment must reach at least 16dBi. If possible, try to use separate transceiver antennas to radiate more radio signal power. Try not to use duplexer antennas because they will lose some power.

[0026] (II) Signal receiving part like Figure 2 As shown, the main function of the signal receiving part is to receive the control command data file of the console and send it to the remote device control part.

[0027] Similar to the signal transmission part, the receiving antenna also uses a high-gain omnidirectional elevated antenna, and the gain should be no less than 16dBi.

[0028] When the antenna receives the control instruction data file at a certain frequency, it first filters out the signal that does not belong to the ultra-short wave communication specified in the signal through a low-pass filter, and sends it to the low-noise gallium arsenide field effect tube amplifier (Gaas Fet), and the low-noise amplifier circuit (Lo Noise Lan) amplifies the high-frequency signal. The local end generates an oscillation wave by a dual differential temperature-compensated oscillator, which is fixed to the ultra-short wave frequency to be used through a fast phase-locked loop (fast PLL) to prevent frequency fluctuations, and is sent to the variable frequency exciter to enhance the signal of the corresponding frequency and strengthen the stability of the signal.

[0029] The oscillation wave generated above is sent to the ring mixer, mixed with the signal received by the antenna to generate an effective signal; the effective signal is sent to the narrowband intermediate frequency amplifier for effective signal amplification, and then D / A conversion is performed by the intermediate frequency DSP processor to achieve a processable waveform amplitude, so that the signal reaches a recognizable strength. It is transmitted to the DSP via the bus, the wireless signal is decoded, and the control command from the console is obtained.

[0030] 3. Remote device control part like Figure 3 As shown, the remote device control part controls the operation of the remote device according to the control instruction data file, and transmits the working data of the remote device back to the console in the form of data through narrowband communication and displays it on the console.

[0031] After receiving the control instruction data file of the signal receiving part, the control instruction is transmitted from the receiver to the communication protocol converter through the narrowband communication interface matcher, and then sent to the PLC-S7 series A / D-RS485 programmable controller for protocol conversion. The controller controls the operation of the remote sensor by connecting the working current of the remote device.

[0032] The opposite of the above work is to transmit the working data obtained by the remote device back to the console. Similar working principle, only need to send the working instruction of obtaining data from the console, the remote device starts working under the control of PLC-S7 series A / D-RS485 programmable controller, and transmits the data in reverse, thus achieving the working purpose of transmitting the data file back to the console.

[0033] At this point, a complete transmission process of sending and uploading work data files has been completed.

[0034] Corresponding to the above system, this embodiment also proposes a data transmission method in an ultra-short wave environment, comprising the following contents: The text control instructions sent by the console to the remote device are converted into transmittable data files and transmitted to the remote device via narrowband radio signals.

[0035] Receive the control command data file from the console and send it to the remote device control part.

[0036] The remote device is controlled according to the control instruction data file, and the working data of the remote device is transmitted back to the control console in the form of data through narrowband communication and displayed on the control console.

[0037] Those skilled in the art will appreciate that all or part of the steps in the above method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a disk or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits, and accordingly, each module / unit in the above embodiment can be implemented in the form of hardware or in the form of software function modules. The present invention is not limited to any specific form of combination of hardware and software.

[0038] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A data transmission system in an ultra-short wave environment, characterized in that: include: The signal transmission part converts the text control instructions sent by the console to the remote device into a transmittable data file and transmits it to the remote device via a narrowband radio signal; The signal receiving part receives the control command data file from the control console and sends it to the remote device control part; The remote device control part controls the operation of the remote device according to the control instruction data file, and transmits the working data of the remote device back to the console in the form of data through narrowband communication, and displays it on the console.

2. The data transmission system in an ultra-short wave environment according to claim 1, characterized in that: The signal transmission part includes a CPU DSP A / D control module, a fast phase-locked loop, a vocoded digital narrowband modulation, an RF / VCO, a dual differential temperature-compensated oscillator, an output power A / D unit, an RF narrowband driving circuit, a power drive unit, an orthogonal feedback APC, an APC comparison ring control unit, a MOSE power amplifier, a low-pass filter, an antenna interface electronic switch and an antenna protection circuit; After the console issues a work instruction, it is received by the baseband data interface, and the received signal is processed and encoded by the CPU DSP; the CPU DSP A / D control module controls the fast phase-locked loop to lock the frequency. At this frequency, the work instruction is converted into an electrical signal that can be processed by the DSP through the A / D controller by the voice code digital narrowband modulation and RF / VCO, and the DSP performs sampling and encoding processing; the CPU DSP A / D control module controls the dual differential temperature compensated oscillator to generate an oscillation wave of the local signal, which is handed over to the fast phase-locked loop to lock the working frequency; the oscillation wave is amplified at high frequency by the RF narrowband driving circuit and then input into the power drive unit; The CPU DSP A / D control module controls the output power. The A / D unit sets the output power. The data signal is suppressed by the orthogonal feedback APC and the APC comparison ring control unit to prevent the signal from being distorted. The signal is then input to the power drive unit and superimposed with the oscillation wave to generate an effective radio signal, which is then amplified by the MOS power amplifier. Unnecessary high-frequency signals are filtered out by a low-pass filter, and useful high-frequency signals are input into the antenna through the antenna protection circuit of the antenna interface electronic switch to transmit the signal outward.

3. The data transmission system in an ultra-short wave environment according to claim 2, characterized in that: The CPU is composed of an embedded microcontroller, and the DSP adopts an ASIC chip.

4. The data transmission system in an ultra-short wave environment according to claim 1, characterized in that: The signal receiving part includes an antenna, a low-pass filter, a low-noise GaAs FET amplifier, a low-noise amplification loop, a dual differential temperature-compensated oscillator, a fast phase-locked loop, a variable frequency exciter, a ring mixer, a narrow-band intermediate frequency amplifier, an intermediate frequency DSP processor and a CPU DSPA / D control module; When the antenna receives the control command data file, the signal is first filtered through a low-pass filter and sent to a low-noise GaAs FET amplifier, where the signal is amplified at high frequency in the low-noise amplification loop. A dual differential temperature-compensated oscillator generates an oscillation wave at the local end, which is fixed to the required ultrashort wave frequency through a fast phase-locked loop and sent to a variable frequency exciter to enhance the signal of the corresponding frequency. The oscillation wave generated above is sent to a ring mixer and mixed with the signal received by the antenna to generate an effective signal. The effective signal is sent to a narrow-band intermediate frequency amplifier for effective signal amplification, and then D / A conversion is performed by an intermediate frequency DSP processor, and then transmitted to the DSP via the bus, the wireless signal is decoded, and the control command from the console is obtained.

5. The data transmission system in an ultra-short wave environment according to claim 1, characterized in that: The remote device control part includes a remote device, a narrowband communication interface matcher, a communication protocol converter and a PLC-S7 series A / D-RS485 programmable controller; After receiving the control instruction data file of the signal receiving part, the control instruction is transmitted from the receiver to the communication protocol converter through the narrowband communication interface matcher, and then sent to the PLC-S7 series A / D-RS485 programmable controller. The controller controls the operation of the remote device by connecting the working current of the remote device.

6. The data transmission system in an ultra-short wave environment according to claim 5, characterized in that: When data needs to be sent back, the remote device will transmit the working data in reverse under the control of the PLC-S7 series A / D-RS485 programmable controller and send it back to the console for display.

7. A data transmission method in an ultra-short wave environment, characterized in that: The data transmission system in an ultra-short wave environment according to any one of claims 1 to 6 is implemented, comprising: Convert text control instructions sent by the console to the remote device into a transmittable data file, and transmit it to the remote device via a narrowband radio signal; Receive the control command data file from the console and send it to the remote device control part; The remote device is controlled according to the control instruction data file, and the working data of the remote device is transmitted back to the control console in the form of data through narrowband communication and displayed on the control console.

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