CN110233705B - Signal transmission system based on wireless communication mode - Google Patents
Signal transmission system based on wireless communication mode Download PDFInfo
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- CN110233705B CN110233705B CN201910500307.0A CN201910500307A CN110233705B CN 110233705 B CN110233705 B CN 110233705B CN 201910500307 A CN201910500307 A CN 201910500307A CN 110233705 B CN110233705 B CN 110233705B
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
Abstract
The present disclosure provides a signal transmission system based on a wireless communication mode, including: the wireless communication device comprises a first wireless communication device, a second wireless communication device and a third wireless communication device, wherein the first wireless communication device comprises a first wireless transceiving module, and the first wireless transceiving module comprises a first physical data cache region; the data received by the first wireless transceiver module enters a first physical data cache region; and judging the data type of the data entering the first physical data cache region, temporarily storing the received data in the first physical data cache region when the data type of the received data is a characteristic data type, and immediately forwarding the received data by the first wireless transceiver module when the data type of the received data is a non-characteristic data type.
Description
Technical Field
The present disclosure belongs to the technical field of wireless communication. The present disclosure relates to a signal transmission system based on a wireless communication method.
Background
In the field of space rocket testing nowadays, rocket-ground communication mostly uses traditional wired communication modes, such as bus forms of RS422, RS485, 1553B, CAN, Ethernet and the like. Because of considering the safety factor, the ground side launch control system is generally divided into front end equipment and rear end equipment, the distance between the front end equipment and the rear end equipment is several kilometers, and the front end equipment and the rear end equipment are connected through an optical cable, so that the purpose of remote control is achieved. The most obvious disadvantages of the traditional arrow-ground communication mode are: the equipment is complex in structure, the communication cable is long, the communication distance is limited, and the communication type is single.
With the increasing demand of rocket tests, the traditional rocket-ground communication type is not limited to simple control and data instructions, and video monitoring signals, voice control signals and wireless sensor signals are gradually added to the rocket tests. The signals have the common characteristics of large data volume, strong randomness and high real-time property. In the face of the requirement of simultaneous transmission of multiple signals, the traditional wired communication mode is difficult to meet the requirement of simultaneous transmission of multiple types of signals by single equipment, if the signals are required to be transmitted, the system architecture must be changed, corresponding communication equipment is added, and thus, great cost burden is brought. And the transmission distance of the common communication mode is generally short, and if long-distance transmission is needed, optical fiber transmission equipment must be added, so that not only are complicated procedures in arrangement and retraction carried out, but also an intermediate transmission link is added, and uncertain factors are brought. In the face of the defects of single transmission and short transmission distance of the traditional signal, the wireless communication technology can be used for well solving the problems.
The Wireless communication technology (Wireless communication) is a communication mode that can exchange information by using the characteristic that electromagnetic wave signals can be transmitted in free space, is applied to the fields of internet of things, unmanned aerial vehicles, unmanned vehicles and the like for the first time, and can complete Wireless data links in a single-point-to-single-point and single-point-to-multipoint networking mode. According to the current application scene, the wireless communication technologies are many and mainly divided into two types, one type is short-distance communication technologies such as ZigBee, Wi-Fi, Bluetooth, Z-wave and the like; another type is a low-power Wide-Area Network (LPWAN), i.e., a Wide Area Network communication technology. LPWANs can be further divided into two categories: one is operating on unlicensed spectrum technologies, such as LoRa; the other is operating in licensed spectrum technologies such as GPRS.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present disclosure provides a signal transmission system based on a wireless communication manner, which is particularly suitable for being used as an arrow-ground multi-signal transmission system. The signal transmission system based on the wireless communication mode is realized by the following technical scheme.
A signal transmission system based on a wireless communication method comprises: the wireless communication device comprises a first wireless communication device, a second wireless communication device and a third wireless communication device, wherein the first wireless communication device comprises a first wireless transceiving module, and the first wireless transceiving module comprises a first physical data cache region; the data received by the first wireless transceiver module enters a first physical data cache region; and judging the data type of the data entering the first physical data cache region, temporarily storing the received data in the first physical data cache region when the data type of the received data is a characteristic data type, and immediately forwarding the received data by the first wireless transceiver module when the data type of the received data is a non-characteristic data type.
According to at least one embodiment of the present disclosure, when the first physical data buffer is filled with the data of the characteristic data type, the first wireless transceiver module forwards the data in the first physical data buffer.
According to at least one embodiment of the present disclosure, the wireless communication device further comprises a second wireless communication device, wherein the second wireless communication device comprises a second wireless transceiver module, and the second wireless transceiver module comprises a second physical data cache region; the data received by the second wireless transceiver module enters a second physical data cache region; and judging the data type of the data entering the second physical data cache region, temporarily storing the received data in the second physical data cache region when the data type of the received data is a characteristic data type, and immediately forwarding the received data by the second wireless transceiver module when the data type of the received data is a non-characteristic data type.
According to at least one embodiment of the present disclosure, when the second physical data buffer is filled with the data of the characteristic data type, the second wireless transceiver module forwards the data in the second physical data buffer.
According to at least one embodiment of the present disclosure, the feature data type is video data.
According to at least one embodiment of the disclosure, in the process of receiving the data of the characteristic data type, if the data of the non-characteristic data type is received, the first wireless transceiver module immediately forwards the data in the first physical data buffer area.
According to at least one embodiment of the disclosure, in the process of receiving the data of the characteristic data type, if the data of the non-characteristic data type is received, the second wireless transceiver module immediately forwards the data in the second physical data buffer.
According to at least one embodiment of the present disclosure, the first wireless communication device further includes a feature type host and a non-feature type host, the first wireless transceiver module forwards the data of the feature data type filled in the first physical data buffer to the feature type host, and the first wireless transceiver module immediately forwards the received data of the non-feature data type to the non-feature type host.
According to at least one embodiment of the present disclosure, the second wireless communication device further includes a feature type host and a non-feature type host, the second wireless transceiver module forwards the data of the feature data type filled in the second physical data buffer to the feature type host, and the second wireless transceiver module immediately forwards the received data of the non-feature data type to the non-feature type host.
According to at least one embodiment of the present disclosure, the feature type host is a host that processes video data, and the non-feature type host is a host that does not process video data.
According to at least one embodiment of the present disclosure, the first wireless communication device includes at least one non-feature type host and the second wireless communication device includes at least one non-feature type host.
According to at least one embodiment of the present disclosure, the first wireless communication device includes a first antenna arrangement and the second wireless communication device includes a second antenna arrangement.
According to at least one embodiment of the present disclosure, the first antenna device employs an active-standby dual-redundant omnidirectional antenna.
According to at least one embodiment of the present disclosure, a second antenna device is configured in a primary-backup dual redundancy manner; the main antenna is configured as a special annular directional antenna and is divided into four sub-antennas which are uniformly embedded in four quadrants, and the included angle of the main lobe of each sub-antenna is larger than 90 degrees; the backup antenna is configured as an omni-directional receive antenna.
According to at least one embodiment of the disclosure, the first wireless transceiver module and the second wireless transceiver module both adopt a single-carrier frequency domain equalization waveform as a physical transmission waveform.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic block diagram of a signal transmission system based on a wireless communication manner according to an embodiment of the present disclosure.
Fig. 2 is a schematic block diagram of a signal transmission system based on a wireless communication manner according to still another embodiment of the present disclosure.
Fig. 3 is a schematic block diagram of a system in which a signal transmission system based on a wireless communication mode is applied to arrow-ground multi-signal transmission according to an embodiment of the present disclosure.
Fig. 4 is a signal transmission diagram of a signal transmission system based on a wireless communication mode applied to arrow-ground multi-signal transmission according to an embodiment of the present disclosure.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.
The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.
When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.
For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," "below … …," "below … …," "below," "above … …," "above," "… …," "higher," and "side (e.g., as in" side walls ") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.
Fig. 1 is a schematic block diagram of a signal transmission system based on a wireless communication manner according to an embodiment of the present disclosure. A signal transmission system 100 based on a wireless communication method, comprising: a first wireless communication device 101, the first wireless communication device including a first wireless transceiver module 1011, the first wireless transceiver module including a first physical data buffer 10111; the data received by the first wireless transceiver module 1011 enters the first physical data buffer 10111; the data type of the data entering the first physical data buffer 10111 is determined, when the data type of the received data is a feature data type, the received data is temporarily stored in the first physical data buffer 10111, and when the data type of the received data is a non-feature data type, the first wireless transceiver module 1011 immediately forwards the received data.
It should be understood by those skilled in the art that the physical data buffer area may be a physical memory of a wireless transceiver module, i.e., a device having wireless signal receiving and wireless signal transmitting (sending), and the above embodiments of the present disclosure are not limited to the type or model of the wireless transceiver module as long as wireless signal receiving and wireless signal transmitting can be achieved.
The characteristic data type refers to a data type which is distinguished from a non-characteristic data type in wireless communication, and the characteristic data type can be preset, for example, in the process of multiple signal communication of rocket, the type of communication data can include: the rocket-ground communication control data flow, the measurement parameter data flow, the video data flow, the satellite navigation data flow and the like, different data flows are converged into a communication link module (namely a wireless transceiver module) in different interface forms, the communication link module preferably adopts a time division duplex form for data receiving, and a plurality of data flows are organically combined together according to requirements. The data is transmitted and received in a high-priority and low-priority mode, different data streams are set to be in different levels of priority according to the importance degree, the data stream with higher importance is set to be in high priority, and the data stream with lower importance is set to be in low priority, so that the data stream with the high priority is guaranteed to be responded preferentially. According to the principle, in the multi-signal transmission process of the rocket, the priority levels are from high to low: communication control flow, guide positioning data flow, measurement parameter data flow and (high-definition) video data flow. In the present embodiment, the (high definition) video data stream is set to the characteristic data type: the wireless transceiver module 1011 determines the data type of the data entering the first physical data buffer 10111, temporarily stores the received video data in the first physical data buffer 10111 when the data type of the received data is video data, and immediately forwards the received data when the data type of the received data is not video data.
Preferably, when the first physical data buffer 10111 is filled with the data of the characteristic data type, the first wireless transceiver module 1011 forwards the data in the first physical data buffer 10111. When the feature data type is video data, the first wireless transceiver module 1011 forwards the data in the first physical data buffer 10111 when the first physical data buffer 10111 is filled with the video data. The present embodiment is not particularly limited to the type of the feature data, and those skilled in the art can appropriately set the feature data according to the type of actual communication data.
Describing the implementation process of the above embodiment in more detail, firstly opening a physical data buffer area with a certain size in a communication link module (i.e. a wireless transceiver module), when data enters, firstly judging the data type, if the data is serial RS422 data (non-video data), then the data enters the buffer area and is sent out immediately, so as to ensure timeliness; if the data type is video data, the data enters the buffer area and is temporarily stored in the buffer area, the data is sent after the data buffer area is filled, and if the serial RS422 data (non-video data) is received in the period, the data is sent out immediately regardless of whether the buffer area is filled. In the actual wireless communication transmission process, besides slow fading closely related to distance and shielding, time-varying fast fading also exists, so that the receiving level continuously fluctuates, therefore, a certain receiving margin is generally considered in application, and according to the application experience of actual measurement video transmission, when the margin is 0-5 dB, a packet loss phenomenon often occurs; when the margin is 5-10 dB, packet loss happens occasionally, and the method can be accepted for occasions with low requirements or retransmission possibility; when the margin is more than 10dB, the packet is basically not lost. And selecting a place to carry out a simulation test, setting the confidence interval of the simulation calculation result to be 90%, obtaining from the simulation result that the rocket can normally communicate with the control point on the ground and after being lifted off within the effective communication distance of 2km, and ensuring normal communication when the link margin is more than 30 dB.
The first wireless communication device 101 in the present embodiment may be disposed on an arrow as an arrow-mounted wireless communication device, or may be disposed on the ground as a ground wireless communication device.
The first wireless communication device 101 further includes a feature type host and a non-feature type host, the first wireless transceiver module 1011 forwards the data of the feature data type filled in the first physical data buffer 10111 to the feature type host, and the first wireless transceiver module 1011 forwards the received data of the non-feature data type to the non-feature type host immediately. The first wireless communication device 101 may further include a first antenna means; the first wireless transceiver module 1011 receives data and transfers data through the first antenna device. The first antenna device preferably adopts a main and standby dual redundant omnidirectional antenna.
When the video data is set as the feature data type in the above embodiment, the feature type host is a host that processes the video data, and the non-feature type host is a host that does not process the video data. The feature type host is, for example, a browsing computer, and the non-feature type host is, for example, a satellite navigation positioning device and/or a display control terminal.
More preferably, during the process of receiving the data of the characteristic data type, if the data of the non-characteristic data type is received, the first wtru 1011 immediately forwards the data in the first physical data buffer 10111.
Fig. 2 is a schematic block diagram of a signal transmission system based on a wireless communication manner according to an embodiment of the present disclosure. The signal transmission system 200 based on the wireless communication method includes: a first wireless communication device 101, the first wireless communication device including a first wireless transceiver module 1011, the first wireless transceiver module including a first physical data buffer 10111; the data received by the first wireless transceiver module 1011 enters the first physical data buffer 10111; judging the data type of the data entering the first physical data cache region 10111, when the data type of the received data is a characteristic data type, temporarily storing the received data in the first physical data cache region 10111, and when the data type of the received data is a non-characteristic data type, immediately forwarding the received data by the first wireless transceiver module 1011; a second wireless communication device 201, wherein the second wireless communication device 201 comprises a second wireless transceiving module 2011, and the second wireless transceiving module 2011 comprises a second physical data cache 20111; the data received by the second wireless transceiver module 2011 enters the second physical data cache 20111; the data type of the data entering the second physical data buffer 20111 is determined, and when the data type of the received data is a feature data type, the received data is temporarily stored in the second physical data buffer 20111, and when the data type of the received data is a non-feature data type, the second wireless transceiver 2011 immediately forwards the received data.
Preferably, when the second physical data buffer 20111 is filled with the feature data type data, the second wireless transceiver 2011 forwards the data in the second physical data buffer 20111.
More specifically, the first wireless communication device 101 includes a feature type host and a non-feature type host, the first wireless transceiver module 1011 forwards the data of the feature data type filled in the first physical data buffer 10111 to the feature type host, and the first wireless transceiver module 1011 immediately forwards the received data of the non-feature data type to the non-feature type host. The first wireless communication apparatus 101 includes a first antenna device; the first wireless transceiver module 1011 receives data (e.g., receives data from the second wireless communication apparatus 201) and forwards data (e.g., forwards data to the feature type host or the non-feature type host of the first wireless communication apparatus 101) through the first antenna device.
When the above-described embodiment sets the video data to the feature data type, the feature type host of the first wireless communication device 101 is, for example, a browsing computer, and the non-feature type host is, for example, a satellite navigation positioning device and/or a display control terminal.
The second wireless communication device 201 includes a feature type host and a non-feature type host, the first wireless transceiver module 2011 forwards the data of the feature data type filled in the first physical data buffer 20111 to the feature type host, and the second wireless transceiver module 2011 immediately forwards the received data of the non-feature data type to the non-feature type host. The second wireless communication device 201 comprises a second antenna arrangement; the second wireless transceiver module 2011 receives data (for example, receives data from the first wireless communication device 101) and forwards data (to the feature type host or the non-feature type host of the second wireless communication device 201) through the second antenna device.
When the video data is set as the feature data type in the above embodiment, the feature type host is a host that processes the video data, and the non-feature type host is a host that does not process the video data. The feature type host of the second wireless communication device 201 is, for example, an arrow-mounted camera, and the non-feature type host is, for example, a navigation positioning device and/or an arrow-mounted flight control machine.
More preferably, if data of a non-characteristic data type is received, the first wireless transceiver module 1011 immediately forwards the data in the first physical data buffer 10111. In the process of receiving the feature data type data, if the data of the non-feature data type is received, the second wtru 2011 immediately forwards the data in the second physical data buffer 20111.
The first antenna device preferably adopts a main and standby dual redundant omnidirectional antenna.
The second antenna device is preferably configured in a main-standby dual redundancy mode; the main antenna is configured as a special annular directional antenna and is divided into four sub-antennas which are uniformly embedded in four quadrants, and the included angle of the main lobe of each sub-antenna is larger than 90 degrees; the backup antenna is configured as an omni-directional receive antenna.
Preferably, the first wtru 1011 and the second wtru 2011 both use single carrier frequency domain equalization waveforms as physical transmission waveforms.
Fig. 3 and 4 are a system framework diagram and a data transmission diagram of applying the signal transmission system based on the wireless communication mode of the present disclosure to a scenario of arrow-ground multi-signal transmission. The wireless transceiver module plays a core role in the signal transmission system based on the wireless communication mode, is a unified device in hardware design, can set the role of the wireless module in a software setting mode, and can provide wireless bidirectional data link between the rocket and the ground by matching with an antenna. The wireless transceiver module is a standard IP communication link, can perform networking, relay transmission and other functions, and supports functions of multi-machine relay, air networking, multi-ground station networking and the like. The transmitter-receiver comprises two links, which are respectively composed of a power amplifier circuit, a low-noise amplifier circuit and a transmitter-receiver switch. Depending on the mounting location and the transmission power, there may be different options in the form and the device. The wireless transceiver module supports TTL level serial ports, RS232, RS422, Ethernet, SDI, Micro HDMI and other interfaces at present, and can communicate with most of test hosts. The wireless transceiver module preferably adopts an advanced SCFDE (Single Carrier frequency Domain equalization) algorithm, a double-antenna space diversity reception and MRC (maximum ratio combining) technology, and has good multipath resistance and Doppler effect resistance; the forward error correction coding adopts a low density parity check code (LDPC) which is the same as the 5G standard, has the decoding capability close to the Shannon threshold, and greatly improves the receiving sensitivity; the high-definition and ultra-low-delay H.265 coding and decoding module is integrated, and the highest support is 1080p @60 fps. The wireless transceiver module adopts a Single Carrier Frequency Domain Equalization (SCFDE) waveform as a physical transmission waveform, the waveform is an uplink waveform of LTE, and the wireless transceiver module is suitable for being applied in an anti-interference and low-power consumption environment. The physical layer adopts the rapid frequency domain processing technology such as modulation, coding, equalization and the like and the MAC (media Access control) layer control technology. A plurality of grouped data subframes are designed in the frame structure, and the grouped data subframes can be allocated to uplink or downlink according to the requirement of service scheduling. Uplink packet data subframes may be allocated to different terminals, and scheduling policies for various radio resources are different in order to support different video, voice, and data services. At a transmitting end, a physical layer needs to complete data scrambling, channel coding, framing, Quadrature Amplitude Modulation (QAM) mapping, upsampling and root-raised cosine filtering (SRRC), obtain a complex baseband analog signal through D/A conversion, and output the complex baseband analog signal through up-conversion and power amplification. In the receiving process, a forward synchronization technology is used, the synchronization of a receiver does not depend on a phase-locked loop for synchronization any more, the synchronization speed is high, and the problem of lock losing caused by deep fading does not exist. In addition, in order to adapt to channel time variation caused by high-speed motion, the receiver adopts channel tracking based on an RLS (recursive least squares) algorithm, and the high-speed motion environment can be supported. This characteristic has been verified on multiple unmanned, manned and helicopter platforms, with the fastest platform speeds being greater than 800 km/h. The wireless transceiver module can set parameters in a webpage access mode, preferably selects an L wave band with a relatively high frequency band, selects 1.4GHz communication frequency, and supports communication rate not lower than 5 Mbps. The wireless transceiver module preferably comprises two radio frequency connectors which jointly form a double-antenna space diversity receiving mode, and the receiving effect is better than that of a single-antenna mode. The video interface can select SDI, Micro HDMI, ethernet form, supports 1080p full high definition video input, data type automated inspection and switching. The antenna is very sensitive to the installation environment, an rocket needs to ensure that an antenna transmission path cannot be blocked, and meanwhile, the flight inclination angle of the rocket also has certain loss on the gain of the antenna. In order to further increase the antenna gain, a directional antenna is adopted in rocket remote communication, the directional antenna adopts a microstrip oscillator plate-shaped antenna with certain directivity, and for example, in the wireless transmission system, the antenna has different shapes and gains according to the electrical characteristics and the assembly requirements. The rocket antenna adopts a main and standby dual redundancy mode, in order to increase the reliability of signal receiving and transmitting, the main antenna is designed into a special annular directional antenna, the antenna is divided into four sub-antennas which are uniformly embedded into four quadrants, the included angle of the main lobe of each sub-antenna is greater than 90 degrees, the antenna gain in each direction is ensured to be not less than 2dBi, the rocket can effectively communicate with the ground no matter what posture is kept in the flying process, and the effective communication distance is not less than 2 km. The backup antenna is an omnidirectional receiving antenna, receives a normal communication instruction and an emergency control signal sent by the ground, and improves the control capability of the ground on the rocket electrical system. The ground antenna adopts a main and standby dual-redundancy glass fiber reinforced plastic omnidirectional antenna, and is fixed on a tripod through a threaded hole at the bottom during installation. Because the rocket-borne antenna has lower gain, the ground needs to adopt a higher-gain omnidirectional antenna, the gain of the omnidirectional antenna is designed to be 7dBi, and because the omnidirectional antenna is easily influenced by the ground, the ground antenna can be elevated by utilizing a tripod so as to eliminate ground interference.
The signal transmission system based on the wireless communication mode can also be applied to other occasions, such as communication between an unmanned aerial vehicle and a control terminal, communication between a marine ship and a land control device, and the like.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (9)
1. A signal transmission system based on wireless communication, for wireless two-way data link between a rocket and the ground, the signal transmission system comprising: the rocket comprises a first wireless communication device arranged on the ground and a second wireless communication device arranged on the rocket;
the first wireless communication device comprises a first wireless transceiving module, and the first wireless transceiving module comprises a first physical data buffer area;
the first wireless transceiver module receives data from second wireless communication equipment and enters the first physical data cache region;
judging the data type of the data entering the first physical data cache region, temporarily storing the received data in the first physical data cache region when the data type of the received data is a characteristic data type, and immediately forwarding the received data by the first wireless transceiver module when the data type of the received data is a non-characteristic data type;
the first wireless communication equipment also comprises a first antenna device, and the first wireless transceiver module receives data and forwards the data through the first antenna device; the first antenna device adopts a main and standby dual redundant omnidirectional antenna;
the second wireless communication equipment comprises a second wireless transceiver module, and the second wireless transceiver module comprises a second physical data cache region;
the data received by the second wireless transceiver module from the first wireless communication equipment enters the second physical data cache region;
judging the data type of the data entering the second physical data cache region, temporarily storing the received data in the second physical data cache region when the data type of the received data is a characteristic data type, and immediately forwarding the received data by the second wireless transceiver module when the data type of the received data is a non-characteristic data type;
the second wireless communication equipment comprises a second antenna device, and the second antenna device is configured in a main-standby dual redundancy mode; the main antenna is configured as a special annular directional antenna and is divided into four sub-antennas which are uniformly embedded in four quadrants, and the included angle of the main lobe of each sub-antenna is larger than 90 degrees; the backup antenna is configured as an omni-directional receive antenna.
2. The signal transmission system of claim 1, wherein the first wireless transceiver module forwards data in the first physical data buffer when the first physical data buffer is filled with data of a characteristic data type.
3. The signal transmission system of claim 1, wherein the second wireless transceiver module forwards data in the second physical data buffer when the second physical data buffer is filled with data of a characteristic data type.
4. Signal transmission system according to one of claims 1 to 3, characterized in that the characteristic data type is video data.
5. The signal transmission system according to claim 1 or 2, wherein during the reception of the data of the characteristic data type, the first radio transceiver module immediately forwards the data in the first physical data buffer if the data of the non-characteristic data type is received.
6. The signal transmission system according to claim 1 or 3, wherein during the reception of the data of the characteristic data type, the second radio transceiver module immediately forwards the data in the second physical data buffer if the data of the non-characteristic data type is received.
7. The signal transmission system according to claim 1 or 2, wherein the first wireless communication device further comprises a feature type host and a non-feature type host, the first wireless transceiver module forwards the feature data type data filled in the first physical data buffer to the feature type host, and the first wireless transceiver module immediately forwards the received non-feature data type data to the non-feature type host.
8. The signal transmission system according to claim 1 or 3, wherein the second wireless communication device further comprises a feature type host and a non-feature type host, the second wireless transceiver module forwards the data of the feature data type filled in the second physical data buffer to the feature type host, and the second wireless transceiver module immediately forwards the received data of the non-feature data type to the non-feature type host.
9. The signal transmission system of claim 8, wherein the feature type host is a host that processes video data, and the non-feature type host is a host that does not process video data.
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