A wireless data link terminal and communication method based on MIMO technology

Abstract

The present invention provides a wireless data link terminal and communication method based on MIMO technology, including: S1: correctly installing a GPS module, a power module, an integrated control module, and multiple groups of transceiver modules on a load module; S2: the integrated control module packages the original data slices into multiple transmission data frames and sends them to the receiving end; S3: the transceiver module demodulates the receipt signal sent by the receiving end to obtain the respective code element clock, signal locking state and receiving data frame; S4: after each signal is received, the integrated control module determines whether the transceiver module receives the correct receiving data frame according to the signal locking state, and sends a confirmation receipt signal. The present invention installs transceiver modules on the six sides of the load module to receive and send signals at different frequencies in all directions, backing up each other, and the receiving results are arbitrated, adopted, stored or forwarded by the integrated control module for correctness, which greatly improves the communication quality and reliability of the wireless data link terminal.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a wireless data link terminal and a communication method based on MIMO technology. Background Art

[0002] Wireless data link terminals are commonly used in military multi-target measurement and control systems. Such devices use FDD (frequency division) or TDD (time division) protocols to achieve data link communication between multiple terminal devices within a certain airspace.

[0003] Traditional wireless data link terminals generally use single-antenna transceiver technology to complete the radiation and reception of carrier signals. However, this single-antenna system is greatly restricted by the antenna installation position. When the relative positions between communication terminals change, the lobe range of a single antenna will affect the communication quality. At the same time, the efficiency of the receiving signal of a single antenna is prioritized, the communication bandwidth of the entire system is low, and the ability to resist channel fading is poor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a wireless data link terminal and a communication method based on MIMO technology. By installing transceiver modules on the six sides of the load module, signals are received and sent at different frequencies in all directions to back up each other. The reception results are arbitrated for correctness, adopted, stored or forwarded by the integrated control module, which greatly improves the communication quality and reliability of the wireless data link terminal and eliminates the influence of multipath fading.

[0005] According to an embodiment of the present invention, a wireless data link terminal based on MIMO technology includes a GPS module, a load module, a power module, an integrated control module and multiple groups of transceiver modules, wherein the multiple groups of transceiver modules are evenly distributed and fixed on six sides of the load module;

[0006] The GPS module is installed at the center of the load module and is electrically connected to all other modules, and is used to locate the spatial position of the load module and the receiving and sending directions of all transceiver modules and send the position information to the integrated control module;

[0007] The power module is fixed on the load module and electrically connected to all other modules to supply power to the entire terminal;

[0008] The transceiver module is used to receive wireless signals, modulate and demodulate them, and send relevant data to the integrated control module;

[0009] The integrated control module is electrically connected to the transceiver module and is used to control the operation of the transceiver module and process related data.

[0010] Preferably, the load module includes a drone, and the transceiver module includes a transceiver antenna.

[0011] On the other hand, according to an embodiment of the present invention, a communication method of a wireless data link terminal based on MIMO technology is also provided, which includes:

[0012] S1: Install the GPS module, power module, integrated control module, and multiple transceiver modules on the load module correctly, and set the transceiver frequency of the transceiver module;

[0013] S2: The integrated control module arranges the original data with the high byte first and the high bit first, and slices and packages it into multiple transmission data frames. Each transmission data frame needs to be modulated by all transceiver modules using the same symbol clock and then transmitted to the receiving end at different frequencies at the same time;

[0014] S3: The transceiver module receives the receipt signals sent back by multiple groups of receiving ends for multiple times. Each time the receipt signals are received, the same signal is received and demodulated at different frequencies to obtain respective symbol clocks, signal lock states and received data frames.

[0015] S4: After each signal is received, the integrated control module determines whether the transceiver module receives the correct received data frame based on the signal lock status, and then splices all the correct received data frames into total data in sequence and compares them with the original data. If the comparison is exactly the same, the transceiver module that receives the correct received data frame sends a confirmation receipt signal to the receiving end.

[0016] Preferably, the transmission data frame and the reception data frame both include: 2 bytes of frame synchronization data + 2 bytes of frame count + 1 byte of source transmission device code + 251 bytes of business data; wherein the frame synchronization data of the transmission data frame sent from each transceiver module is different.

[0017] Preferably, the method for acquiring the signal lock status is as follows: the transceiver modules synchronously demodulate the same receipt signal received at their respective frequencies, and search for frame synchronization data in the received data frame with the same code element clock, and report the signal lock status to the integrated measurement and control module after searching for the set frame synchronization data.

[0018] Preferably, the GPS module also records the position of the load module and the receiving and sending directions of all transceiver modules, and sends the position information to the integrated control module in real time. The integrated control module determines whether the receiving and sending directions of all transceiver modules deviate from the receiving end based on the position information, and in S2, the original data needs to be equally sliced ​​and repackaged according to the number of transceiver modules that have not deviated from the receiving end.

[0019] Preferably, the GPS module records the position of the load module and the receiving and sending direction of the transceiver module at a time interval of 1 second.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) Six groups of transceiver modules installed on the six sides of the payload module are used to send and receive signals, which expands the coverage of the antenna and realizes wireless transceiver communication in the entire airspace, overcoming the limitations of the directional communication of the single antenna system on the device orientation or the flight posture of the device carrier.

[0022] (2) Multiple transceiver modules send and receive signals at different frequencies in an all-round manner and back up each other. The reception results are arbitrated for correctness, adopted, stored or forwarded by the integrated control module, which greatly improves the communication quality and reliability of the wireless data link terminal.

[0023] (3) Dynamically select the transceiver module corresponding to the receiving end and divide the original data into slices and repackage them according to their number for transmission and reception merging. This can improve the real-time performance of data communication and expand the data communication bandwidth, avoid data frame loss, and reduce the bit error rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 4 is a system principle diagram of an embodiment of the present invention.

[0025] Figure 2 The figure is a schematic diagram of the signal coverage of a single transceiver antenna according to an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of the signal coverage of the six-directional transceiver antenna according to an embodiment of the present invention.

[0027] Figure 4 4 is a schematic diagram of a multi-channel redundancy principle of an embodiment of the present invention.

[0028] Figure 5 The data slicing and receiving principle diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] like Figure 1 As shown, the embodiment of the present invention proposes a wireless data link terminal based on MIMO technology, including a GPS module, a load module, a power module, an integrated control module and six groups of transceiver modules, all of which are designed using the VPX standard. The six groups of transceiver modules are respectively installed on the upper and lower, left and right, front and back six surfaces of the load module and the six groups of transceiver modules are numbered in the order of 1 to 6, wherein:

[0031] The GPS module is installed at the center of the load module and is electrically connected to all other modules, and is used to locate the spatial position of the load module and the receiving and sending directions of all transceiver modules and send the position information to the integrated control module;

[0032] The power module is fixed on the load module and electrically connected to all other modules to supply power to the entire terminal;

[0033] The transceiver module is used to receive wireless signals, modulate and demodulate them, and send relevant data to the integrated control module;

[0034] The integrated control module is electrically connected to the transceiver module and is used to control the operation of the transceiver module and process related data.

[0035] The receiving and transmitting frequencies, enabling control, and receiving and transmitting timing of the six groups of transceiver modules are all scheduled by the integrated control module. The integrated control module can select one or more modules of the six groups of transceiver modules to participate in data communication and synthesis according to the needs of the actual application scenario. Figure 2 and Figure 3 The signal coverage range of the receiving and transmitting antennas is relatively known. The multi-antenna system can realize wireless receiving and transmitting communication in the entire airspace. It overcomes the limitation of the directional communication of the single antenna system on the device orientation or the flight posture of the device carrier.

[0036] On the other hand, an embodiment of the present invention further provides a communication method of a wireless data link terminal based on MIMO technology, which comprises the following steps:

[0037] S1: Install the GPS module, power module, integrated control module, and 6 transceiver modules on the drone correctly, and then set the transceiver frequencies of the 6 transceiver modules to different values ​​to avoid co-frequency interference and frame loss when the transceiver modules are sending and receiving signals, reduce the bit error rate, and then start sending and receiving data.

[0038] Using multiple groups of transmitting and receiving antennas to send and receive signals expands the coverage of the antenna and enables wireless transmission and reception communications in the entire airspace, overcoming the limitations of the single-antenna system's directional communication on the device orientation or flight posture of the device carrier.

[0039] S2: Figure 4 As shown, the integrated control module arranges the original data with the high byte first and the high bit first, and slices and packages it into multiple transmission data frames. Each transmission data frame needs to be serially converted and pulse coded modulated (PCM modulated) by the integrated control module and then sent to all transceiver modules. After being modulated with the same code element clock, it is transmitted to the receiving end at the same time at different frequencies.

[0040] As shown in Table 1, the structure of each transmitted data frame is implemented according to the IRIG106 telemetry standard, including 2 bytes of frame synchronization data + 2 bytes of frame count + 1 byte of source transmitting device code + 251 bytes of business data. The length of a data frame is 256 bytes, and when transmitting a data frame, the byte transmission timing is high byte first, and high bit first.

[0041] Table 1 Data slices and frame structure

[0042]

[0043] Among them, the frame synchronization data is mainly used to identify the transceiver module. When the transmission data frame with the same business data is sent, it will be sent to the receiving end simultaneously by 6 transceiver modules at different frequencies. Therefore, the frame synchronization data will be different in the transmission data frames with the same business data sent from different transceiver modules, and the frame synchronization data will be the same in the transmission data frames with different business data sent by the same transceiver module.

[0044] The frame count characterizes the order and position of the transmitted data frames. The post-analysis of the received data can determine the communication quality based on the continuity of the upper and lower frame counts. FC1 represents the high byte and FC0 represents the low byte.

[0045] The source transmitting device code is mainly used for the selection and control of the data forwarding link. ID is the terminal device number of the transmitting signal, and CH is the transceiver module number (1 to 6) of the terminal transmitting the signal. This has a very special practical significance in the ground command and control center's monitoring of the air data link.

[0046] Usually, the number of communications is relatively large, so the terminal's working mode needs to be set to a channel multiplexing data transmission mode. In this mode, the integrated module will slice the original data a and then package them separately, such as Figure 5 As shown, the terminal has 6 transceiver modules, and the total data consists of 300 bytes, so the total data will be evenly sliced ​​into a1, a2, a3, a4, a5, a6, each slice data ai has 50 bytes, and each slice data ai is modulated by the transceiver module i using the code element clock and then transmitted after the packaging scale transmits the data frame, where the data domain a=∑ai, and the data frame format of each channel is the same as the channel redundancy method.

[0047] In addition, in actual use, a receiving status feedback mechanism is set between the terminal that transmits the signal and the receiving terminal. Therefore, the receiving and sending directions of some transceiver modules will deviate from the receiving end. When the deviated transceiver modules transmit data, the receiving end cannot reliably receive the data. When the receiving end sends a receipt signal, the transceiver module cannot reliably receive the receipt signal. Therefore, the GPS module transmits a pulse once every second to record the position of the load module and the receiving and sending directions of all transceiver modules, and sends the position-related information to the integrated control module in real time. The integrated control module determines whether the receiving and sending directions of all transceiver modules deviate from the receiving end. If deviated, the transceiver module will not be enabled to send and receive data. At this time, the original data needs to be evenly sliced ​​and packaged according to the number of transceiver modules that have not deviated from the receiving end. For example, if one group of transceiver modules deviates and five groups of transceiver modules face the receiving end, the original data a will be evenly sliced ​​into five parts and packaged.

[0048] Dynamically select the transceiver module opposite to the receiving end and divide the original data into slices and repackage them according to their number, and then send and receive the data together, which can improve the real-time performance of data communication and expand the data communication bandwidth, avoid data frame loss, and reduce the bit error rate.

[0049] S3: The transceiver module receives the receipt signals sent back by multiple groups of receiving ends for multiple times. Each time the receipt signals are received, the same signal is received and demodulated at different frequencies to obtain respective symbol clocks, signal lock states and received data frames.

[0050] After receiving the signal, the receiving end will return a receipt signal. Different transceiver modules will receive the same receipt signal at different frequencies and demodulate synchronously to obtain their own codeword clock, signal lock status and received data frame. In fact, the codeword clock obtained by each transceiver module after synchronous demodulation is the same. The structure of the received data frame is the same as the structure and data content of the transmitted data frame, but the received data frame also includes receipt confirmation information for the transceiver module to recognize. In addition, during demodulation, the transceiver modules that receive the receipt signal use the same codeword clock to search for the frame synchronization data in the received data frame. When the set frame synchronization data is searched, the signal lock status is reported to the integrated measurement and control module. The reporting period is one data frame period.

[0051] S4: After each signal is received, the integrated control module determines whether the transceiver module receives the correct received data frame based on the signal lock status, and then splices all the correct received data frames into total data in sequence and compares them with the original data. If the comparison is exactly the same, the transceiver module that receives the correct received data frame sends a confirmation receipt signal to the receiving end.

[0052] Since the structure and data content of the transmitted data frame and the received data frame are the same, the frame synchronization data content is also the same, and the frame synchronization data indicates which transceiver module sent it. Therefore, for multiple receipt signals received by the same transceiver module, the fusion control module determines that if the frame synchronization data is different from the frame synchronization data of the transmitted data frame in all signal lock states reported by the transceiver module, the received data frame will be discarded, otherwise it is a correct received data frame. After that, the business data in all correct received data frames are spliced ​​in the order of frame counts to form the total data, and the integration of the received data bandwidth of each module is realized to expand the data bandwidth of the communication. After that, the total data is compared with the original data. If the comparison is exactly the same, the transceiver module that receives the correct received data frame sends a confirmation receipt signal to the receiving end. At this point, the entire data reception and transmission process is completed.

[0053] The transceiver modules send and receive the same data at different frequencies and back up each other. The reception results can be arbitrated for correctness, adopted, stored or forwarded by the integrated control module. This channel redundancy greatly improves the communication quality and reliability of the wireless data link terminal and eliminates the impact of multipath fading.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution 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 solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A communication method for a wireless data link terminal based on MIMO technology, applied to a wireless data link terminal, characterized in that: The wireless data link terminal includes a GPS module, a load module, a power module, an integrated control module and multiple transceiver modules, and the multiple transceiver modules are evenly distributed and fixed on the six sides of the load module; the GPS module is installed at the center of the load module and electrically connected to all other modules, and is used to locate the position of the load module in space and the receiving and sending directions of all transceiver modules and send the position information to the integrated control module; the load module includes a drone, and the transceiver module includes a transceiver antenna; the power module is fixed on the load module and electrically connected to all other modules, and is used to power the entire terminal; the transceiver module is used to receive wireless signals and modulate and demodulate them, and send relevant data to the integrated control module; the integrated control module is electrically connected to the transceiver module, and is used to control the operation of the transceiver module and the processing of relevant data; The communication method comprises the following steps: S1: Install the GPS module, power module, integrated control module, and multiple transceiver modules on the load module correctly, and set the transceiver frequency of the transceiver module; S2: The integrated control module arranges the original data with the high byte first and the high bit first, and slices and packages it into multiple transmission data frames. Each transmission data frame needs to be modulated by all transceiver modules using the same symbol clock and then transmitted to the receiving end at different frequencies at the same time; S3: The transceiver module receives the receipt signals sent back by multiple groups of receiving ends for multiple times. Each time the receipt signals are received, the same signal is received and demodulated at different frequencies to obtain respective symbol clocks, signal lock states and received data frames. S4: After each signal is received, the integrated control module determines whether the transceiver module receives the correct received data frame based on the signal lock status, and then splices all the correct received data frames into total data in sequence and compares them with the original data. If the comparison is exactly the same, the transceiver module that receives the correct received data frame sends a confirmation receipt signal to the receiving end.

2. The communication method of a wireless data link terminal based on MIMO technology as claimed in claim 1, characterized in that: The transmission data frame and the reception data frame both include: 2 bytes of frame synchronization data+2 bytes of frame count+1 byte of source transmission equipment code+251 bytes of service data; wherein the frame synchronization data of the transmission data frame sent from each transceiver module is different.

3. The communication method of a wireless data link terminal based on MIMO technology as claimed in claim 2, characterized in that: The method for acquiring the signal lock status is as follows: the transceiver modules synchronously demodulate the same receipt signal received at their respective frequencies, and search for frame synchronization data in the received data frame with the same code element clock, and report the signal lock status to the integrated measurement and control module after searching for the set frame synchronization data.

4. The communication method of a wireless data link terminal based on MIMO technology as claimed in claim 3, characterized in that: The GPS module also records the position of the load module and the receiving and sending directions of all transceiver modules, and sends the position information to the integrated control module in real time. The integrated control module determines whether the receiving and sending directions of all transceiver modules deviate from the receiving end based on the position information, and in S2, the original data needs to be evenly sliced ​​and repackaged according to the number of transceiver modules that have not deviated from the receiving end.

5. The communication method of a wireless data link terminal based on MIMO technology as claimed in claim 4, characterized in that: The GPS module records the position of the load module and the receiving and sending direction of the transceiver module at a time interval of 1 second.

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