Hydrological data transmission terminal based on Beidou short message

Abstract

The invention discloses a hydrological data transmission terminal based on a Beidou short message, and the terminal comprises a processing unit which is used for receiving original hydrological data collected by a hydrological station, processing the original hydrological data into hydrological data in a Beidou short message standard format, compressing the hydrological data, and transmitting the compressed hydrological data to a short message receiving and transmitting unit; and the short message transceiving unit comprises a signal processing module, a radio frequency module and an antenna which are connected in sequence, and the signal processing module is used for subpackaging the compressed hydrological data and then transmitting the data to a satellite through the radio frequency module and the antenna. Dependence on a communication base station can be reduced, and hydrological data can be timely and effectively transmitted.

Description

Technical Field

[0001] The present invention belongs to the technical field of data transmission, and in particular relates to a hydrological data transmission terminal based on Beidou short messages. Background Art

[0002] Hydrological monitoring stations provide important data for drought and flood prevention forecasting, water conservancy project construction, flood control and emergency management, etc., which are closely related to people's vital interests and have strict requirements on the integrity and accuracy of the data. Hydrological stations are usually built in relatively open and remote areas, and the commonly used wireless data transmission links are 4G / 5G / NBIOT and other methods. When monitoring rainfall or other weather, it is easy to encounter extremely bad weather, and communication base stations are easily damaged and interfered with. At this time, the communication between the station and the outside world is very easy to be disconnected, resulting in the inability to transmit hydrological data to the outside world in a timely and complete manner.

[0003] Therefore, how to reduce the dependence on communication base stations and transmit hydrological data in a timely and effective manner is a technical problem to be solved by technical personnel in this field. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem in the prior art that hydrological monitoring and reporting stations are heavily dependent on communication base stations and cannot transmit accurate and complete hydrological data to the outside world in a timely manner when severe weather occurs.

[0005] In order to achieve the above technical objectives, the present invention provides a hydrological data transmission terminal based on Beidou short message, the terminal comprising: A processing unit, used to receive the original hydrological data collected by the hydrological station and process it into hydrological data in the Beidou short message standard format, and also compress the hydrological data and send it to the short message transceiver unit; The short message transceiver unit comprises a signal processing module, a radio frequency module and an antenna which are connected in sequence. The signal processing module is used to packetize the compressed hydrological data and transmit the data to the satellite through the radio frequency module and the antenna.

[0006] Furthermore, the processing unit compresses the hydrological data, specifically including: Converting the text data in the hydrological data into state bits and changes in a dictionary library, wherein the dictionary library is a dictionary library established in advance based on training data; Extracting and retaining pitch, intensity and formant parameters of the speech data in the hydrological data; The most repeated pixels in each picture of the picture data in the hydrological data are marked, the continuous repeated pixels in each picture are represented by a pointer and a length, and the non-continuous repeated pixels in each picture only transmit the color deviation value from the mark.

[0007] Furthermore, the signal processing module packages the compressed hydrological data, specifically including: Divide the compressed hydrological data into N short message data packets according to the packet division formula; Performing XOR operation on each short message data packet to obtain the corresponding check packet; Generate a data packet based on the length of the check packet and perform an XOR operation on it to obtain a redundant packet; All verification packages and redundant packages are regarded as the packaged hydrological data.

[0008] Furthermore, the antenna specifically includes an RDSS receiving antenna and an RDSS transmitting antenna, the band of the RDSS receiving antenna is the S band, and the band of the RDSS transmitting antenna is the L band.

[0009] Furthermore, the antenna also includes a filter and an amplifier, and the short message transceiver unit also includes a receiver. The amplifier is connected to the receiver through a feeder. After the passive part of the antenna completes the conversion of the space electromagnetic wave signal into the electrical signal, the converted electrical signal is filtered and amplified once by the filter and the amplifier, and then filtered and amplified twice by the receiver, and then down-converted, intermediate frequency filtered and analog-to-digital conversion operations are performed to obtain a digital intermediate frequency signal. Then, the digital intermediate frequency signal is carrier-stripped and code-stripped by the signal processing module to track the navigation message and extract the observation quantity. The observation quantity is processed by the signal processing module to determine the antenna position, speed and satellite position.

[0010] Further, the short message transceiver unit receives the satellite signal specifically including: Real-time capture of satellite signals, wherein the satellite signals include satellite pseudo-random codes, satellite signal carrier frequencies and code phases; The receiver copies a local carrier of an initial frequency and a local spread spectrum code of an initial phase according to a preset acquisition algorithm; Determine whether the initial frequency of the local carrier is consistent with the satellite signal carrier frequency, and also determine whether the initial phase of the local spread spectrum code is consistent with the code phase; If they are consistent, the parameter value of the copied signal at this time is used as the parameter value for connecting to the corresponding satellite. If they are not consistent, the receiver copies the local carrier of the uncopied frequency and the local spread spectrum code of the uncopied phase according to a preset capture algorithm until they are consistent.

[0011] The present invention provides a hydrological data transmission terminal based on Beidou short message. Compared with the prior art, the present terminal includes: a processing unit for receiving the original hydrological data collected by the hydrological station and processing it into hydrological data in Beidou short message standard format, and also compressing the hydrological data and sending it to the short message transceiver unit; the short message transceiver unit includes a signal processing module, a radio frequency module and an antenna connected in sequence, and the signal processing module is used to packetize the compressed hydrological data and transmit it to the satellite through the radio frequency module and the antenna. It can reduce the dependence on the communication base station and transmit the hydrological data in a timely and effective manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 Shown is a schematic diagram of the structure of a hydrological data transmission terminal based on Beidou short messages provided in an embodiment of this specification. DETAILED DESCRIPTION

[0014] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0015] like Figure 1 The flowchart of the hydrological data transmission terminal based on Beidou short message provided by the embodiment of this specification is shown. Although the terminal structure shown in the following embodiment or the accompanying drawings is provided in this specification, more or fewer operation steps or module units may be included in the method or device based on routine or no creative labor. In the steps or structures where there is no necessary causal relationship logically, the execution order of these steps or the module structure of the device is not limited to the execution order or module structure shown in the embodiment or the accompanying drawings of this specification. In actual application, the terminal structure can be executed sequentially or in parallel according to the structure shown in the embodiment or the accompanying drawings.

[0016] The hydrological data transmission terminal based on Beidou short message provided in the present embodiment is as follows Figure 1 As shown, the terminal specifically includes: A processing unit, used to receive the original hydrological data collected by the hydrological station and process it into hydrological data in the Beidou short message standard format, and also compress the hydrological data and send it to the short message transceiver unit; The short message transceiver unit comprises a signal processing module, a radio frequency module and an antenna which are connected in sequence. The signal processing module is used to packetize the compressed hydrological data and transmit the data to the satellite through the radio frequency module and the antenna.

[0017] The short message receiving circuit is composed of antenna, LNA module, RDSS RF module, RDSS signal processing module, real-time clock and other components. The antenna includes RDSS receiving (S-band) antenna and RDSS transmitting (L-band) antenna; LNA-C receives the navigation signal broadcast by RDSS satellite, performs low-noise amplification, and obtains sufficient carrier power for back-end processing; receives the small signal RF signal fed by the RDSS RF module, and after power amplification, it is transmitted to the satellite in space by the transmitting antenna.

[0018] Specifically, the hardware can perform signal processing with simple algorithms but large computational workload, and reduce the burden of the software processing module as much as possible, while software programming can support complex processing algorithms and be responsible for most of the control operations and communication protocol processing. The hardware is implemented using large-scale FPGA devices, including: hardware integrated digital down-conversion, precision ranging code direct capture, code precision tracking, despreading, timing, Viterbi decoding, RDSS inbound signal transmission and other high-speed signal processing modules, as well as interface logic with single-point positioning module, confidentiality module, information processing module, etc.; the software is implemented by DSP devices to complete the control of channel parameters, loop filter calculation, communication protocol processing, etc. All functions of the signal processing module are implemented on a circuit board, and the core components on the board are general-purpose programmable DSP, FPGA and A / D chips. In addition, the board is also distributed with power conversion management chips, interface chips, FLASH memory, etc. FPGA uses devices with a scale of about 60,000 LEs, and DSP and A / D chips are both high-speed devices to meet the needs of the equipment.

[0019] In an embodiment of the present application, the antenna further includes a filter and an amplifier, and the short message transceiver unit further includes a receiver, the amplifier is connected to the receiver through a feeder, and the passive part of the antenna completes the conversion of the space electromagnetic wave signal to the electrical signal, and then performs a filtering and amplification on the converted electrical signal through the filter and the amplifier, and then performs a secondary filtering and amplification through the receiver, and then performs down-conversion, intermediate frequency filtering and analog-to-digital conversion operations to obtain a digital intermediate frequency signal, and then the digital intermediate frequency signal is stripped of the carrier and the code by the signal processing module, and then the navigation message is tracked and the observation quantity is extracted, and the observation quantity is processed by the signal processing module to determine the antenna position, speed and satellite position. Further, the passive part of the antenna completes the conversion of the space electromagnetic wave signal to the electrical signal, and is amplified by the SAW filter and the first-stage LNA in the antenna, and is connected to the receiver through a feeder. The receiver amplifies and filters the signal again, and then performs down-conversion, intermediate frequency filtering, and ADC conversion operations to convert it into a digital intermediate frequency signal. The digital intermediate frequency signal is in the baseband, and the carrier stripping and code stripping are completed, and the navigation message is tracked and the observation quantity is extracted. The positioning algorithm calculates the satellite position based on the ephemeris and the antenna position and speed based on the observed values.

[0020] In the embodiment of the present application, the processing unit is further used to compress the hydrological data, specifically including: Converting the text data in the hydrological data into state bits and changes in a dictionary library, wherein the dictionary library is a dictionary library established in advance based on training data; Extracting and retaining pitch, intensity and formant parameters of the speech data in the hydrological data; The most repeated pixels in each picture of the picture data in the hydrological data are marked, the continuous repeated pixels in each picture are represented by a pointer and a length, and the non-continuous repeated pixels in each picture only transmit the color deviation value from the mark.

[0021] Specifically, there are three main types: message compression, voice compression, and image compression. 1) The location and hydrological information transmission in the message transmission is a high-frequency transmission content. We optimize the data protocol and collect multiple packets for one transmission at the same time to reduce the public transmission content and achieve more efficient data transmission. The location content of a typical transmission includes: reporting time (year, month, day, hour, minute, second), sampling interval, number of sampling points, sampling time (hour, minute, second), sampling point 1 (longitude, latitude, elevation, heading, speed), sampling point 2 (longitude, latitude, elevation, heading, speed). In this way, the data volume is compressed to about 90 bits to transmit a sampling location. For hydrological information, the commonly used rainfall, wind speed, water level and other information are set in the dictionary library. Each transmission only transmits the status bit and the change amount, reducing the data transmission volume. 2) Voice compression mainly collects data through hardware audio pickup equipment, and then extracts its pitch, sound intensity, resonance peak, etc. as parameters to describe the characteristics of the voice signal, thereby achieving compression. 3) Image compression mainly identifies and processes repeated color pixels. The core of this method is to select the most repeated pixels in the image as a marker through data analysis. For continuous repeated pixels, a pointer and length are used to indicate the starting position and length of the repeated segment. For non-continuous repeated pixels, only the deviation value from the marker color is transmitted to achieve efficient compression operations.

[0022] In the embodiment of the present application, the signal processing module is also used to sub-packetize the compressed hydrological data, specifically including: Divide the compressed hydrological data into N short message data packets according to the packet division formula; Performing XOR operation on each short message data packet to obtain the corresponding check packet; Generate a data packet based on the length of the check packet and perform an XOR operation on it to obtain a redundant packet; All verification packages and redundant packages are regarded as the packaged hydrological data.

[0023] Specifically, the present invention is based on the big data packetization mechanism and designs a transmission protocol with feedback retransmission mechanism and information redundancy coding to ensure the correctness of the data. In this way, even if one data packet received by the receiving end is lost, it can be restored through XOR operation to complete the recovery of the source data. This method avoids the shortcomings of limited information transmission bandwidth and unreliable communication link of the Beidou satellite navigation system to a certain extent. The design process is as follows: 1) Divide the information into N Beidou short message data packets according to the packet calculation formula; 2) For messages whose byte number does not meet the Beidou satellite transmission length, the BCD code FF is automatically added until each sub-packet fills the maximum byte of the Beidou short message; 3) Perform XOR operation on each short message segment to obtain a check packet, which is an information redundancy packet, as the checksum of the short message data; 4) The command center platform for receiving information sent by the terminal edits the original message, adds a data packet of the same length (the N+1th packet) after the Nth Beidou short message data packet, and sends it out from the information sending platform as an information redundancy packet. This redundant packet is obtained from step 3); 5) Since the BeiDou-3 can only send a short message of 1,000 Chinese characters at most, the amount of data is not particularly large. Therefore, as long as the receiving end successfully receives any N packets, it can successfully recover the complete data information. The channel encoder at the sending end adds redundant code elements to the information code element sequence according to a certain relationship, and the channel decoder at the receiving end uses this relationship to discover and correct possible errors. When forward error correction coding is used, there is no need for reverse channel retransmission instructions, and there is no delay caused by repeated retransmission, so the real-time performance is better.

[0024] At the Beidou application layer, by adding redundant information through encoding, the problem of packet loss recovery can be solved within a certain range and the information transmission success rate of the communication system can be improved.

[0025] In the embodiment of the present application, the terminal is also connected to a hydrological collection module to obtain raw hydrological data, and the processing unit also includes processing the raw hydrological data to form hydrological data in a short message format.

[0026] Specifically, the original hydrological data is collected by various hydrological collection modules, which are hydrological sensors such as rain gauges, water level gauges, current meters and flow meters. The original hydrological data includes the collected Beidou card number, water level information, rainfall information, and latitude, longitude and elevation information.

[0027] In the embodiment of the present application, the short message transceiver unit receives the satellite signal specifically including: Real-time capture of satellite signals, wherein the satellite signals include satellite pseudo-random codes, satellite signal carrier frequencies and code phases; The receiver copies a local carrier of an initial frequency and a local spread spectrum code of an initial phase according to a preset acquisition algorithm; Determine whether the initial frequency of the local carrier is consistent with the satellite signal carrier frequency, and also determine whether the initial phase of the local spread spectrum code is consistent with the code phase; If they are consistent, the parameter value of the copied signal at this time is used as the parameter value for connecting to the corresponding satellite. If they are not consistent, the receiver copies the local carrier of the uncopied frequency and the local spread spectrum code of the uncopied phase according to a preset capture algorithm until they are consistent.

[0028] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0029] The embodiments of this specification are not limited to complying with industry communication standards, standard computer resource data update and data storage rules, or the situations described in one or more embodiments of this specification. Certain industry standards or slightly modified implementation plans based on the implementation described in the custom method or embodiment can also achieve the same, equivalent or similar, or predictable implementation effects after deformation of the above-mentioned embodiments. The embodiments obtained by using these modified or deformed data acquisition, storage, judgment, processing methods, etc. can still fall within the scope of the optional implementation plans of the embodiments of this specification.

[0030] The controller can be implemented in any appropriate manner, for example, the controller can take the form of a computer-readable medium such as a microprocessor or processor and a computer-readable program code (such as software or firmware) that can be executed by the (micro)processor, a logic gate, a switch, an application specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, ATMEL AT91SAM, MICROCHIP PIC18F26K20, and SILICONE LABS C8051F320. The memory controller can also be implemented as part of the control logic of the memory. It is also known to those skilled in the art that in addition to implementing the controller in a purely computer-readable program code manner, the controller can be implemented in the form of a logic gate, a switch, an application specific integrated circuit, a programmable logic controller, and an embedded microcontroller by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the devices included therein for implementing various functions can also be considered as structures within the hardware component. Or even, the devices for implementing various functions can be considered as both software modules for implementing the method and structures within the hardware component.

[0031] The device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. There may be other divisions in actual implementation, such as multiple units or plug-ins may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some interface, indirect coupling or communication connection of the device or unit, which may be electrical, mechanical or other forms.

[0032] These computer program instructions may also be loaded onto a computer or other programmable resource data updating device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions executed on the computer or other programmable device for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0033] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this specification. In this specification, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0034] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A Beidou short message hydrological data transmission terminal, characterized in that: The terminal comprises: A processing unit, used to receive the original hydrological data collected by the hydrological station and process it into hydrological data in the Beidou short message standard format, and also compress the hydrological data and send it to the short message transceiver unit; The short message transceiver unit comprises a signal processing module, a radio frequency module and an antenna which are connected in sequence. The signal processing module is used to packetize the compressed hydrological data and transmit the data to the satellite through the radio frequency module and the antenna.

2. The hydrological data transmission terminal based on Beidou short message according to claim 1, characterized in that: The processing unit compresses the hydrological data, specifically including: Converting the text data in the hydrological data into state bits and changes in a dictionary library, wherein the dictionary library is a dictionary library established in advance based on training data; Extracting and retaining pitch, intensity and formant parameters of the speech data in the hydrological data; The most repeated pixels in each picture of the picture data in the hydrological data are marked, the continuous repeated pixels in each picture are represented by a pointer and a length, and the non-continuous repeated pixels in each picture only transmit the color deviation value from the mark.

3. The hydrological data transmission terminal based on Beidou short message according to claim 1, characterized in that: The signal processing module packages the compressed hydrological data, specifically including: Divide the compressed hydrological data into N short message data packets according to the packet division formula; Performing XOR operation on each short message data packet to obtain the corresponding check packet; Generate a data packet based on the length of the check packet and perform an XOR operation on it to obtain a redundant packet; All verification packages and redundant packages are regarded as the packaged hydrological data.

4. The hydrological data transmission terminal based on Beidou short message as claimed in claim 1, characterized in that: The antenna specifically includes an RDSS receiving antenna and an RDSS transmitting antenna. The band of the RDSS receiving antenna is the S band, and the band of the RDSS transmitting antenna is the L band.

5. The hydrological data transmission terminal based on Beidou short message according to claim 1, characterized in that: The antenna also includes a filter and an amplifier, and the short message transceiver unit also includes a receiver. The amplifier is connected to the receiver through a feeder. After the passive part of the antenna completes the conversion of the space electromagnetic wave signal into the electrical signal, the converted electrical signal is filtered and amplified once by the filter and the amplifier, and then filtered and amplified twice by the receiver, and then down-converted, intermediate frequency filtered and analog-to-digital conversion operations are performed to obtain a digital intermediate frequency signal. Then, the digital intermediate frequency signal is stripped of the carrier and the code by the signal processing module, and the navigation message is tracked and the observation quantity is extracted. The observation quantity is processed by the signal processing module to determine the antenna position, speed and satellite position.

6. The hydrological data transmission terminal based on Beidou short message according to claim 1, characterized in that: The short message transceiver unit receiving the satellite signal specifically includes: Real-time capture of satellite signals, wherein the satellite signals include satellite pseudo-random codes, satellite signal carrier frequencies and code phases; The receiver copies a local carrier of an initial frequency and a local spread spectrum code of an initial phase according to a preset acquisition algorithm; Determine whether the initial frequency of the local carrier is consistent with the satellite signal carrier frequency, and also determine whether the initial phase of the local spread spectrum code is consistent with the code phase; If they are consistent, the parameter value of the copied signal at this time is used as the parameter value for connecting to the corresponding satellite. If they are not consistent, the receiver copies the local carrier of the uncopied frequency and the local spread spectrum code of the uncopied phase according to a preset capture algorithm until they are consistent.

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