Wireless signal enhancement method and system for power distribution automation terminal equipment

Abstract

The invention discloses a wireless signal enhancement method and system for power distribution automation terminal equipment, and relates to the technical field of wireless signal enhancement, and the method comprises the steps: preliminarily receiving and analyzing a wireless signal, and carrying out the first interference suppression; adding a frequency sequence and demodulating an effective signal; and enhancing and transmitting the effective signal through a first enhancement method. According to the wireless signal enhancement method for the power distribution automation terminal equipment provided by the invention, through the wireless signal enhancement method, the signal enhancer is installed in the use area in a short-distance and multi-section manner, so that the power distribution network automation terminal equipment can better receive wireless signals through the signal enhancer; therefore, the automatic installation and debugging time of the power distribution network is shortened, and even if the area where the automatic terminal equipment of the power distribution network is located has no wireless signal or the strength of the wireless signal is weak, the wireless signal can be received through the device. The method has better effects in the aspects of signal stability, applicable distance and automatic installation and debugging time of the power distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless signal enhancement, and in particular to a wireless signal enhancement method and system for distribution automation terminal equipment. Background Art

[0002] Since wireless public network communication has the advantages of wide geographical coverage, mature and reliable technology, and easy implementation, it is widely used in the current distribution network automation system, that is, the distribution terminals, distribution substations and distribution master stations in the distribution network system communicate through wireless public network communication technology. However, in the early stage of construction, the base stations of wireless public network communication were more concerned with traditional call traffic. Therefore, although the signal coverage of the wireless communication public network is wide, there are still some areas that cannot be covered. This also makes the distribution terminals in the distribution automation system, especially the switch terminal equipment (DTU) in the power room in remote areas or underground power rooms, often offline due to weak wireless signal strength or no signal, which greatly increases the installation and commissioning time of distribution network automation. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention is proposed.

[0004] Therefore, the technical problem solved by the present invention is: the existing wireless public network communication method cannot provide complete coverage, and how to stabilize the wireless signal strength and reduce the installation and commissioning time of distribution network automation.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a wireless signal enhancement method for distribution automation terminal equipment, comprising preliminarily receiving and analyzing wireless signals, performing a first interference suppression; adding a frequency sequence and demodulating the effective signal; enhancing and transmitting the effective signal through a first enhancement method.

[0006] As a preferred solution of the wireless signal enhancement method for distribution automation terminal equipment described in the present invention, wherein: the preliminary reception and analysis of the wireless signal includes receiving the wireless signal transmitted by the data background.

[0007] As a preferred solution of the wireless signal enhancement method for distribution automation terminal equipment described in the present invention, the preliminary reception and analysis of the wireless signal also includes a signal enhancer separating the received wireless signal.

[0008] As a preferred solution of the wireless signal enhancement method for distribution automation terminal equipment described in the present invention, the first interference suppression includes extracting and removing interference signals from the wireless signal.

[0009] As a preferred solution of the wireless signal enhancement method for distribution automation terminal equipment described in the present invention, wherein: the adding of frequency sequence and demodulating effective signal includes adding frequency sequence to effective signal.

[0010] As a preferred solution of the wireless signal enhancement method for distribution automation terminal equipment described in the present invention, the adding of frequency sequence and demodulation of effective signal also includes receiving effective signal in wireless signal by frequency hopping.

[0011] As a preferred solution of the wireless signal enhancement method for distribution automation terminal equipment described in the present invention, wherein: the enhancement and transmission of the effective signal by the first enhancement method includes enhancing and transmitting the effective signal, and the terminal equipment receives the enhanced wireless signal.

[0012] Another object of the present invention is to provide a wireless signal enhancement system for distribution automation terminal equipment, which can install signal enhancers in the use area in a short distance and multiple sections, so that the distribution network automation terminal equipment can better receive wireless signals through the signal enhancers, thereby reducing the installation and commissioning time of distribution network automation. Even if there is no wireless signal in the area where the distribution network automation terminal equipment is located, or the wireless signal strength is relatively weak, the wireless signal can be received through the device. This solves the problem that the current wireless public network communication contains a long installation and commissioning time for distribution network automation.

[0013] As a preferred solution of the wireless signal enhancement system for distribution automation terminal equipment described in the present invention, it includes: an interference suppression module, a signal optimization module, and a signal enhancement module; the interference suppression module is used to preliminarily receive and analyze wireless signals and perform a first interference suppression; the signal optimization module is used to add frequency sequences and demodulate effective signals; the signal enhancement module is used to enhance and transmit effective signals through a first enhancement method.

[0014] A computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a method for enhancing wireless signals for distribution automation terminal equipment.

[0015] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for enhancing a wireless signal for a distribution automation terminal device.

[0016] Beneficial effects of the present invention: The wireless signal enhancement method for distribution automation terminal equipment provided by the present invention uses the wireless signal enhancement method to install a signal enhancer in the use area in a short distance and in multiple sections, so that the distribution network automation terminal equipment can better receive the wireless signal through the signal enhancer, thereby reducing the installation and commissioning time of the distribution network automation. Even if there is no wireless signal in the area where the distribution network automation terminal equipment is located, or the wireless signal strength is relatively weak, the wireless signal can be received by the device. The wireless signal enhancement method solves the problem of wireless signal loss and large interference signal caused by only laying communication lines for wireless signal transmission at a long distance. The present invention achieves better results in terms of signal stability, applicable distance and installation and commissioning time of distribution network automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 An overall flow chart of a wireless signal enhancement method for distribution automation terminal equipment provided in the first embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0020] Example 1, reference Figure 1 , as an embodiment of the present invention, provides a method for enhancing wireless signals for distribution automation terminal equipment, comprising:

[0021] S1: Preliminary reception and analysis of wireless signals, and first interference suppression;

[0022] Furthermore, the preliminary receiving and analyzing of the wireless signal includes receiving the wireless signal transmitted by the data background. The signal booster receives the wireless signal transmitted by the data background through the signal amplifier.

[0023] Through the signal booster, the effectiveness of the wireless signal during transmission is improved, and the initial reception of the wireless signal is completed.

[0024] It should be noted that the preliminary reception and analysis of the wireless signal also includes the signal enhancer separating the received wireless signal. The signal enhancer analyzes and processes the received wireless signal to separate the valid signal from the interference signal. The frequency range of the valid signal is obtained based on the maximum and minimum values ​​of the valid signal in the wireless signal.

[0025] It should also be noted that performing the first interference suppression includes extracting and removing the interference signal from the wireless signal. The signal enhancer extracts and removes the interference signal from the wireless signal.

[0026] During the processing, a frequency sequence is added to the wireless signal received by the signal booster so that the effective signal in the wireless signal undergoes frequency hopping.

[0027] Since interference signals usually only exist at specific frequencies, frequency hopping enables the receiving end to receive only frequency signals with less interference, thereby improving the anti-interference ability of the wireless signal.

[0028] Furthermore, the first interference suppression may be performed by a variety of methods, such as frequency hopping technology or adaptive filtering technology, and other methods that can adapt to the wireless signal enhancement of distribution automation terminal equipment may also be adopted.

[0029] As a preferred embodiment, in this embodiment, the first interference suppression adopts frequency hopping technology, and its principle steps are as follows: when the wireless signal is de-interferenceed, the communication method can be selected according to the on-site environment, such as antenna or feeder connection and other methods. When using an antenna for wireless signal transmission, obstacles between the transmitter and the receiver should be minimized. When using a feeder connection for transmission, avoid long-distance transmission to prevent the feeder itself from generating interference electric fields and interference signals. The solution is to reasonably set the distance between two adjacent signal enhancers when installing the mid-section signal enhancer to reduce the adverse effects of the excessively long feeder. By adding a frequency sequence to the wireless signal, the effective signal is frequency-hopped. Since interference signals usually exist at specific frequencies, frequency hopping can enable the receiving end to avoid the interference frequency band and only receive frequency signals with less interference, thereby improving the anti-interference ability of the wireless signal.

[0030] In another feasible embodiment, the first interference suppression adopts adaptive filtering technology, and its principle steps are: using an adaptive filter to perform real-time filtering processing on the received wireless signal. The adaptive filter automatically adjusts the filter parameters according to the characteristics of the input signal, suppresses the interference signal, extracts the effective signal, and improves the signal-to-noise ratio and anti-interference ability of the signal.

[0031] S2: Add frequency sequence and demodulate valid signal.

[0032] Furthermore, adding the frequency sequence and demodulating the valid signal includes adding the frequency sequence to the valid signal.

[0033] Select the appropriate modulation method, such as amplitude shift keying (ASK), frequency shift keying (FSK) and Gaussian frequency shift keying (GFSK), according to the site environment and wireless signal transmission power.

[0034] ASK: requires a very high signal-to-noise ratio to demodulate the signal and is suitable for low-power transmission scenarios.

[0035] FSK: Transmits digital information by changing the frequency of the carrier signal. It is suitable for application scenarios where transmission efficiency is not high.

[0036] GFSK: FSK modulation is performed after pre-modulation filtering by a Gaussian low-pass filter. It is suitable for wireless communication systems that require efficient spectrum utilization and good noise resistance.

[0037] Generate a high frequency carrier signal using an oscillator or frequency synthesizer to generate a stable high frequency carrier signal.

[0038] Modulate the information signal, multiply or superimpose the information signal to be transmitted with the high-frequency carrier signal to form a modulated signal.

[0039] For example, in FSK modulation, different bit values ​​are represented by changing the carrier frequency.

[0040] Adjust the frequency sequence. During the modulation process, the spectrum of the modulated signal is controlled by changing the 3dB bandwidth of the Gaussian low-pass filter.

[0041] The bandwidth can also be controlled by adjusting the center frequency and frequency range of the wireless signal.

[0042] It should be noted that adding a frequency sequence and demodulating a valid signal also includes receiving a valid signal in a wireless signal by frequency hopping.

[0043] The signal booster receives valid signals in the wireless signal by frequency hopping.

[0044] When receiving, the signal booster demodulates the received signal and restores it to the original valid signal.

[0045] When sending and receiving effective signals, the wireless signal transmitting end and receiving end of the signal enhancer need to be adjusted to the same frequency to reduce the signal loss of effective signals during the interference removal process.

[0046] S3: Enhance and transmit the effective signal using the first enhancement method.

[0047] Furthermore, enhancing and transmitting the effective signal by the first enhancement method includes enhancing and transmitting the effective signal, and the terminal device receives the enhanced wireless signal. The signal enhancer enhances and transmits the received effective signal. During the enhancement process, the signal enhancer enhances the effective signal through an internal amplifier circuit (such as a radio frequency amplifier). During the transmission process, the amplified signal is re-transmitted through the internal antenna, covering the area that was originally inaccessible, thereby expanding the coverage and strength of the wireless signal.

[0048] It should be noted that the first enhancement method may be a variety of methods, such as internal amplifier circuit enhancement or repeater link cascading and other methods that can enhance wireless signals.

[0049] As a preferred embodiment, the first enhancement method in this embodiment adopts an internal amplifier circuit enhancement method, and its principle steps are as follows: a WIFI transmitter is selected as an amplifier, and the WIFI transmitter can be connected to a signal enhancer via a feeder or wireless interconnection. A directional guide reflector plate can be installed around the WIFI transmitter, and is made of a smooth and flat aluminum plate. The directional guide reflector plate is movably connected to the WIFI transmitter to meet the reflection and enhancement of the transmission signal, thereby reducing the loss of the transmission signal during the transmission process.

[0050] The signal booster integrates a radio frequency amplifier circuit. When the effective signal is received and separated from the interference signal, the radio frequency amplifier amplifies the effective signal to increase the amplitude of the signal. When the effective signal passes through the amplifier circuit, its original frequency and modulation mode are maintained, and its signal strength is enhanced to avoid introducing new distortion or noise.

[0051] In another feasible embodiment, the first detection of the oscillation mode adopts a subspace identification method (matrix-pencil method), and its principle steps are: multiple signal enhancers (i.e. repeaters) are installed on the signal transmission path, and these enhancers are arranged at a certain distance interval, and the distance between adjacent enhancers does not exceed one half of their maximum signal coverage range.

[0052] Each signal booster receives the wireless signal from the previous booster or data backend.

[0053] The received signal passes through the internal amplifier circuit to process and amplify the effective signal, filter out the interference signal, and maintain the signal quality. The amplified signal is sent to the next booster or terminal device through the booster's transmitting antenna. Through the cascade amplification and forwarding of multiple signal boosters, the effective transmission distance of the wireless signal is extended, breaking through the coverage limitation of a single booster.

[0054] Embodiment 2, an embodiment of the present invention, provides a method for enhancing wireless signals for distribution automation terminal equipment. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0055] First, in order to verify the effectiveness of the wireless signal enhancement method for distribution automation terminal equipment proposed in this invention, an experiment was conducted in a real environment with significant electromagnetic interference. The experimental site was selected in an urban area with dense high-rise buildings and many wireless signal interference sources. There are a large number of Wi-Fi networks, Bluetooth devices and other wireless communication systems around, forming a complex electromagnetic environment.

[0056] A data background system is built to continuously send wireless signals containing important operation data to distribution automation terminal devices at different distances. The signal booster is deployed according to the method of the present invention, using frequency hopping technology for first interference suppression and using an internal amplifier circuit to enhance the signal.

[0057] During the experiment, the signal booster receives the wireless signal transmitted by the data background through the signal amplifier. After preliminary analysis and processing of the received signal, the signal booster separates the effective signal and the interference signal. By measuring the maximum and minimum values ​​of the effective signal, its frequency range is determined.

[0058] Next, the first interference suppression is performed. According to the on-site environment, the antenna is selected for wireless signal transmission to minimize obstacles between the transmitter and the receiver. The signal booster adds a frequency sequence to the effective signal to make it perform frequency hopping to avoid the frequency band with interference. Since the interference signal is usually concentrated in a specific frequency range, frequency hopping can improve the signal's anti-interference ability.

[0059] Then, select the appropriate modulation method. According to the environmental conditions and transmission power requirements, the frequency shift keying (FSK) modulation method is selected. A stable high-frequency carrier signal is generated by a frequency synthesizer, and the information signal is modulated onto the carrier by changing the carrier frequency to represent different bit values. The spectrum of the modulated signal is controlled by adjusting the 3dB bandwidth of the Gaussian low-pass filter. At the same time, the center frequency and frequency range of the wireless signal are adjusted to effectively control the bandwidth.

[0060] The signal booster receives the valid signal after frequency hopping, demodulates it, and restores the original valid signal. In this process, ensure that the wireless signal transmitter and receiver of the signal booster are adjusted to the same frequency to reduce signal loss during the interference removal process.

[0061] Finally, the signal booster uses the internal RF amplifier to enhance the effective signal. The enhanced signal is retransmitted through the internal antenna, expanding the coverage and strength of the wireless signal. The terminal device receives the enhanced wireless signal through an external antenna or feeder connection. During installation, arrange the antenna position reasonably, set up high-quality signal amplifiers, optimize the layout of antennas and feeders, reduce signal attenuation, and ensure the effective transmission of wireless signals.

[0062] Table 1 Experimental data comparison table

[0063]

[0064] Referring to Table 1, it can be seen that at the test point 1 at a distance of 50 meters, the signal strength of the traditional enhancement method is -70dBm, the data throughput is 10Mbps, and the signal-to-noise ratio is 20dB. After adopting the method of the present invention, the signal strength is increased to -65dBm, the data throughput is increased to 15Mbps, and the signal-to-noise ratio is increased to 25dB. This shows that in the case of close distance, the present invention can effectively enhance the signal strength and improve the data transmission efficiency.

[0065] As the distance increases, the signal attenuation becomes more obvious. At test point 3 at a distance of 150 meters, the signal strength of the traditional method drops to -80dBm, the data throughput is only 6Mbps, and the signal-to-noise ratio is 15dB. The method of the present invention maintains the signal strength at -70dBm, increases the data throughput to 11Mbps, and increases the signal-to-noise ratio to 21dB. It can be seen that the present invention can still maintain a high signal quality and transmission rate at a medium distance.

[0066] At a long-distance test point, such as test point 6 at a distance of 300 meters, the signal strength of the traditional enhancement method dropped to -95dBm, the data throughput was only 1Mbps, and the signal-to-noise ratio was 8dB. After adopting the method of the present invention, the signal strength was increased to -78dBm, the data throughput was increased to 5Mbps, and the signal-to-noise ratio was increased to 15dB. This fully demonstrates the advantages of the present invention in long-distance transmission.

[0067] Analyzing the above data, we can draw the following conclusions:

[0068] Significantly improved signal strength: The present invention uses a combination of frequency hopping and internal amplifier circuits to increase signal strength by 5-17dB at each test point, which effectively overcomes the attenuation of signals during spatial transmission.

[0069] Improved data throughput: Enhanced signal strength and higher signal-to-noise ratio directly lead to increased data throughput. At all test points, the method of the present invention is 3-5Mbps higher than the traditional method, with a maximum increase of 5 times. This is of great significance for data transmission of distribution automation terminal equipment.

[0070] Improved signal-to-noise ratio: Through effective interference suppression and signal enhancement, the method of the present invention improves the signal-to-noise ratio at all distances, with an improvement range of 5-7dB. A higher signal-to-noise ratio means more reliable communication quality and lower bit error rate.

[0071] Compared with the existing technology, the traditional signal enhancement method usually only relies on a simple amplifier, lacks effective suppression of interference signals, and makes it difficult to improve the signal-to-noise ratio and data transmission rate. The present invention avoids the interference frequency band by introducing frequency hopping technology, and combines the signal enhancement of the internal amplifier circuit to comprehensively improve the transmission performance of wireless signals.

[0072] Embodiment 3, an embodiment of the present invention provides a wireless signal enhancement system for distribution automation terminal equipment, including an interference suppression module, a signal optimization module, and a signal enhancement module.

[0073] Among them, the interference suppression module is used to preliminarily receive and analyze wireless signals and perform first interference suppression; the signal optimization module is used to add frequency sequences and demodulate effective signals; and the signal enhancement module is used to enhance and transmit effective signals through a first enhancement method.

[0074] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0075] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0076] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0077] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for enhancing wireless signals for distribution automation terminal equipment, characterized in that: include: Preliminarily receiving and analyzing wireless signals and performing first interference suppression; Add frequency sequence and demodulate valid signal; The effective signal is enhanced and transmitted by the first enhancement method.

2. The method for enhancing wireless signals for distribution automation terminal equipment according to claim 1, characterized in that: The preliminary receiving and analyzing of wireless signals includes receiving wireless signals transmitted by a data background.

3. The method for enhancing wireless signals for distribution automation terminal equipment according to claim 2, characterized in that: The preliminary receiving and analyzing of wireless signals also includes a signal enhancer separating the received wireless signals.

4. The method for enhancing wireless signals for distribution automation terminal equipment according to claim 3, characterized in that: The performing the first interference suppression includes extracting and removing the interference signal from the wireless signal.

5. The method for enhancing wireless signals for distribution automation terminal equipment according to claim 4, characterized in that: The adding the frequency sequence and demodulating the valid signal includes adding the frequency sequence to the valid signal.

6. The method for enhancing wireless signals for distribution automation terminal equipment according to claim 5, characterized in that: The adding of the frequency sequence and demodulating the valid signal also includes receiving the valid signal in the wireless signal by frequency hopping.

7. The method for enhancing wireless signals for distribution automation terminal equipment according to claim 6, characterized in that: The enhancing and transmitting of the effective signal by the first enhancing method includes enhancing and transmitting the effective signal, and the terminal device receives the enhanced wireless signal.

8. A system using the wireless signal enhancement method for distribution automation terminal equipment according to any one of claims 1 to 7, characterized in that: Including interference suppression module, signal optimization module, signal enhancement module; The interference suppression module is used to preliminarily receive and analyze wireless signals and perform first interference suppression; The signal optimization module is used to add frequency sequences and demodulate valid signals; The signal enhancement module is used to enhance and transmit a valid signal through a first enhancement method.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for enhancing a wireless signal for a distribution automation terminal device according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for enhancing wireless signals for distribution automation terminal equipment according to any one of claims 1 to 7 are implemented.

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