CN113329410B - Cluster blind area covering system based on narrowband ad hoc network emergency - Google Patents
Cluster blind area covering system based on narrowband ad hoc network emergency Download PDFInfo
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- CN113329410B CN113329410B CN202110254483.8A CN202110254483A CN113329410B CN 113329410 B CN113329410 B CN 113329410B CN 202110254483 A CN202110254483 A CN 202110254483A CN 113329410 B CN113329410 B CN 113329410B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
- H04W16/20—Network planning tools for indoor coverage or short range network deployment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/08—Trunked mobile radio systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a cluster blind area covering system based on a narrow-band ad hoc network emergency, which receives and preprocesses through a node of an access area, sends compressed voice stream through the ad hoc network, and sends the voice stream to a forwarding area after the voice stream is transmitted by the ad hoc network, thereby completing a forwarding process. Different from a single-hop wireless network, data exchange is required to be carried out between ad hoc network nodes through a multi-hop data forwarding mechanism, each node can serve as a router of other nodes, and the flexible deployment of the ad hoc network nodes is utilized to provide a motorized, flexible, stable and reliable blind area coverage system.
Description
Technical Field
The invention relates to communication equipment, in particular to a cluster blind area covering system based on a narrow-band ad hoc network emergency.
Background
Along with the rapid development of cities in China, more and more high-rise buildings are provided, matched underground parking lots are generated, and basement parking lots of some high-rise buildings generally have three or more underground places. In addition, urban roads in China have been developed rapidly in the last decade, and a large number of tunnels and bridges are derived particularly when rail transit is established. Due to the closed and semi-closed structures of the buildings, once an emergency happens, the existing means cannot keep smooth communication, and great difficulty is brought to work.
The sudden event is not divided into occasions, time, results and regions, and is possible to occur at any time, and wireless communication guarantee is an indispensable important means for handling the sudden event. Wireless communication began in the 80's of the last century with 150M and 400M walkie-talkies. The 90 s entered 350M simulated conventional and clustered systems. The Tetra digital cluster system was introduced in part of cities after 2000. In the past decade, the 350M PT1327 analog trunking communication system is the main means for wireless communication command and dispatch, and as the demand develops, the shortcomings of the analog trunking system gradually emerge. Therefore, a domestic PDT standard is provided, PDT adopts a 4FSK modulation TDMA technology, frequency interval of 12.5KHz and large-area coverage. The PDT and MPT1327 network is initially formed and used together after the development of years, and the situation of the PDT system is gradually transited. However, both PDT and MPT1327 networks are deployed in large areas, which has a large cost advantage in the coverage area of a wide area, but in a complex urban environment, the problem of the blind area of the last hundred meters is particularly prominent due to the influence of buildings and walls on signals.
In conclusion, the problem of the last one hundred meters blind area is a difficult problem to be solved urgently no matter the current mainstream narrow-band PDT and MPT1327 system or the future broadband cluster B-Trunc/MCPTT system. Therefore, a narrow-band ad hoc network cluster communication system is developed for meeting the actual emergency requirements, and the problem of the blind area coverage of the narrow-band cluster is solved, so that the narrow-band ad hoc network cluster communication system has great practical significance. The project integrates the existing trunking communication system and the wireless ad hoc network technology, develops the ad hoc network trunking communication system based on the narrow band, and the system can meet the audio and video transmission requirements of special occasions and further improves the efficiency.
Disclosure of Invention
Aiming at the problems, the cluster blind area covering system based on the narrow-band ad hoc network emergency is provided.
The purpose of the invention can be realized by the following technical scheme:
based on a narrow-band ad hoc network emergency cluster blind area covering system, receiving is carried out through nodes of an access area, preprocessing is carried out, compressed voice streams are sent through the ad hoc network, and after transmission of the ad hoc network, the voice streams are sent to a forwarding area, so that a forwarding process is completed.
The further technology of the invention is as follows:
preferably, the node pretreatment of the access area comprises that the radio frequency signal is subjected to frequency selection, amplification, demodulation and power amplification to output a voice signal, and after preamplification, the voice signal is input into the MCU of the centralized control unit to be packaged and input into the ad hoc network through voice coding and compression.
Preferably, the node reaching the forwarding area is unpacked and decompressed by the centralized control unit, and then amplified and sent to the transmitting unit for modulation and up-conversion processing, so that a forwarding process is completed.
Preferably, the ad hoc network comprises a plurality of nodes, and all the nodes coordinate the respective behaviors of each node through a layered protocol architecture and a distributed algorithm.
Preferably, the node of ad hoc network adopts movable monomer mounting structure, including node equipment shell and mounting panel shell, mounting panel shell diameter is greater than the node equipment shell, mounting panel shell lateral wall tip is equipped with the edge structure of enstrophe, is equipped with the breach in the edge structure, is equipped with the axle in the breach, and epaxial cover has the sleeve pipe, bushing swinging arms middle section, the swinging arms top is equipped with interior bellied first bead, the outer lateral wall of node equipment shell is equipped with the second bead, the second bead and the breach quantity and the relative position of node equipment shell are the same, swinging arms bottom inboard is equipped with first spring-loaded on the mounting panel shell.
Preferably, the bottom of the node equipment shell is provided with a third rib, the third rib and the second rib are located on the same side, and the height of the third rib is higher than that of the second rib.
Preferably, the second rib and the third rib are convex rib rings arranged around the periphery of the node equipment shell.
Preferably, the cross sections of the first rib, the second rib and the third rib are semicircular.
Preferably, the lateral wall of the node equipment shell is provided with a plurality of vertical hollow bodies, the lateral wall of the node equipment shell of each vertical hollow body is provided with a vertical slide way, each vertical slide way is communicated with the corresponding vertical hollow body, the bottom of each third convex edge is provided with a slide block, each slide block penetrates through the corresponding vertical slide way and is clamped in the corresponding vertical hollow body, each vertical hollow body is internally provided with a second spring, the top of each second spring is connected to the top of the corresponding vertical hollow body, the top of each second spring is connected to the top of the corresponding slide block, the bottom of each vertical hollow body is provided with a through hole, the bottom of each slide block is provided with an ejector rod, each ejector rod penetrates through the corresponding through hole and extends to the bottom of the corresponding node equipment shell, the length of each ejector rod, the vertical slide way and the vertical hollow bodies are identical, a plurality of ejector blocks are arranged at the inner bottom of the mounting plate shell, the ejector blocks are located under the ejector rods, the upper surfaces of the ejector blocks are inclined surfaces, the lowest ends of the inclined surfaces are not contacted with the bottoms of the node equipment shells.
Preferably, the top of the vertical hollow body is flush with the second rib.
The beneficial effects are that: different from a single-hop wireless network, data exchange is required to be carried out between ad hoc network nodes through a multi-hop data forwarding mechanism, each node can serve as a router of other nodes, and the flexible deployment of the ad hoc network nodes is utilized to provide a motorized, flexible, stable and reliable blind area coverage system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a diagram of the overall architecture of the system of the present invention;
FIG. 2 is a signal flow diagram of a node according to the present invention;
FIG. 3 is a schematic diagram of the system of the present invention;
FIG. 4 is a schematic diagram of the transmission of an ad hoc network according to the present invention;
FIG. 5 is a block diagram of an Ad hoc network protocol stack of the present invention;
FIG. 6 is a schematic structural diagram of a node device according to the present invention;
FIG. 7 is a schematic view of the mounting plate housing of the present invention in its free-standing configuration;
FIG. 8 is a schematic cross-sectional view of a node device housing of the present invention;
FIG. 9 is an enlarged view of a portion of the structure of FIG. 8;
FIG. 10 is a partial schematic view of a bottom structure of a node device;
FIG. 11 is a schematic top view of the mounting plate housing of the present invention;
in the drawings: 1: node device housing, 2: mounting plate housing, 3: edge structure, 4: notch, 5: shaft, 6: swing lever, 7: first rib, 8: second rib, 9: third rib, 10: first spring, 11: vertical hollow body, 12: vertical slide, 13: slider, 14: second spring, 15: through hole, 16: ejector rod, 17: top block, 18: sleeve pipe
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected through an intermediate medium, or connected through the insides of two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Based on a narrowband ad hoc network emergency cluster blind area covering system, as an integral construction diagram according to the project of fig. 1, voice and video are borne in a single-frequency-point ad hoc network, the voice system is divided into an access area, a relay area and a forwarding area, the voice is received through nodes of the access area and is subjected to relevant preprocessing, a compressed voice stream is sent through the ad hoc network, relay is carried out through the nodes of the relay area to reach the forwarding area, a blind area of the forwarding area can be an isolated point or an area, a centralized control unit can carry out real-time intelligent judgment and then sends the blind area to the nodes of the forwarding area, the nodes of the forwarding area unpack and restore the voice, carry out up-conversion transmission, and complete a forwarding process. The precondition of the trunking signal forwarding process is signal judgment and selection, so real-time tracking and control of trunking channels must be established. The video signal can be transmitted back to the instruction box in a single-path or multi-path unicast mode through adaptation and coding.
As shown in fig. 2, the radio frequency signal of the node in the trunking signal access area is subjected to frequency selection, amplification, demodulation and power amplification to output a voice signal, the voice signal is subjected to preamplification, then is input to the MCU of the centralized control unit for packaging through voice coding and compression, and then is input to the ad hoc network communication unit, and after transmission of the ad hoc network, the voice signal reaches the node in the forwarding area, is unpacked and decompressed by the centralized control end, and is amplified and then sent to the transmitting unit for modulation and up-conversion. And the centralized control unit is responsible for processing the judgment and selection, the PTT control and the synchronous control of the voice stream. The video front end inputs the MCU through video coding to queue and buffer the media stream, outputs the media stream to the ad hoc network for transmission, and then decodes and outputs the media stream from the opposite end. The video has no real-time control part and belongs to quasi-real-time service, so that corresponding processing is required under a multi-hop environment, and the bandwidth of narrow-band voice information is prevented from being occupied.
As shown in fig. 3, the communication system at the ad hoc network comprises a wireless ad hoc network unit, a radio station transceiver unit, a voice coding and enhancing unit, a centralized control and adaptation unit, and a video coding unit, wherein a radio frequency signal received by the radio station is received and demodulated and restored into a baseband voice signal through down-conversion, the voice signal is filtered, amplified and digitalized and then sent into the voice coding unit for compression, a code stream after voice compression is sent to a wireless ad hoc network data interface, meanwhile, the centralized control performs decision and determines a forwarding area node, the relay area node relays and then sends to the forwarding area, and the forwarding area converts the voice stream into the baseband signal for modulation and up-conversion to emit the radio frequency signal.
The video coding adopts H.265, and H.265 achieves optimal setting by improving code stream, coding quality, time delay and algorithm complexity. H.265 can realize 1080P full high-definition video transmission under the condition of bandwidth limitation, and can realize narrow-band video stream transmission through ad-hoc network multi-hop channel detection and adaptive code stream control.
The wireless ad hoc network does not need to pre-erect any wireless communication infrastructure, and all nodes coordinate the respective behaviors of each node through a layered protocol system and a distributed algorithm. As shown in fig. 4, the coverage area of each node is limited due to the limitation of the wireless transmission power of each node. The communication between nodes beyond the effective transmitting power is completed by multi-hop forwarding of intermediate nodes, and the multi-hop nodes are cooperatively completed according to a routing protocol. The Ad hoc network allows the nodes to be opened or closed according to the needs of the nodes, and the nodes are in a complex and changeable environment and are influenced by factors such as the transmitting power of a wireless communication channel, the coverage range of an antenna, interference among channels and the like, so that the communication relation among the nodes can be changed continuously, and the topology of the Ad hoc network can be changed dynamically. Therefore, the routing protocols adopted by different use environments and deployment methods will affect the overall performance.
As shown in fig. 5, the physical layer completes modem, transmission and reception of wireless signals, the layer adopts OFDMA transmission technology to easily combine with advanced technologies such as high-speed modulation and coding, and supports QPSK, 16QAM and 64QAM to combine with Turbo/LDPC coding, high-order modulation will bring wider bandwidth, but is more susceptible to interference, so it is more reasonable to apply QPSK to narrowband in a multi-hop environment, and it is a better choice to adaptively and dynamically adjust modulation and coding according to the situation of the code stream.
The selection of receiving and transmitting frequency is very important for indoor environment, the 340MHz is dominant frequency point, the penetrating and diffraction performance is strong, the floor can vertically penetrate more than 3 layers, and the microwave communication network is suitable for communication networking in the interior of buildings and even basements, but a large amount of microwave image transmission equipment is easily interfered. The interference condition, the bandwidth and the diffraction capability must be comprehensively considered, and a good use effect is achieved. The link layer performs medium access control, data transfer, synchronization error correction, and flow control. The layer adopts an ad hoc network technology, and discovery, establishment of a wireless link and topology maintenance of communication nodes are completed by carrier sense multiple access and time division multiple access, and finally interconnection access of all the communication nodes is completed. The network layer completes functions of neighbor discovery, packet routing and network interconnection, the neighbor discovery is used for collecting network topology information, and the routing protocol is responsible for discovering and maintaining the routing of the source node and the destination node. The data transmission mode of the ad hoc network is mainly a unicast mode and a broadcast mode, the efficiency of the broadcast mode adopted by the control part is higher according to the characteristics of the project, and the network storm can be reduced by adopting the unicast mode for transmitting the real-time audio code stream and the quasi-real-time video stream, so that the method is more reasonable.
The project is special in use occasion, the emergency event often has the characteristics of burstiness and mobility, flexible and conveniently-deployed software and hardware equipment needs to be developed, and the targeted research needs to be carried out on protocol optimization, bandwidth allocation, code stream control and the like.
1) Study on how to construct ad-hoc network-based routing
Different from a single-hop wireless network, data exchange is required to be carried out between ad hoc network nodes through a multi-hop data forwarding mechanism, and each node can serve as a router of other nodes. Irregular changes of wireless channel quality, movement, joining, exiting and the like of nodes can cause dynamic changes of network topology structures. The ad hoc network routing protocol functions to monitor changes in network topology, exchange routing information, locate the destination node, generate, maintain and select routes, and provide network connectivity in such an environment. Routing protocols are the basis by which mobile nodes communicate with each other. According to the route triggering principle, the current routing protocols can be divided into three categories: 1) routing protocol based On routing Table driver (Table driver) 2) routing protocol On-Demand driver (On-Demand driver) 3) a mix of Table driver and On-Demand driver.
A key issue in multihop networks is how to select an appropriate route. When the topology changes, flooding (flooding) becomes the only choice for packet transmission, and flooding consumes a lot of network bandwidth. Although the load of the table-driven routing protocol remains unchanged basically with the acceleration of the node movement, under the condition of accelerated topology change, the convergence cannot be carried out in time, so that a large number of unreliable routes and routing loops are caused, and packet loss is caused. The on-demand routing protocol performs better at this time.
In terms of routing overhead and message sending rate, the on-demand routing algorithm has obvious advantages in performance compared with the table-driven routing algorithm. The project relies on the existing cluster radio station to carry out communication extension, routing requests have new characteristics, and due to the fact that calls of personnel in an extended communication range have the characteristics of randomness and mobility, for example: the trunking calling density is low, the effective calling time is short, PTT simplex transmission is adopted, and most of the transmission code streams are short-time large-particle information transmission. Although the voice stream has high requirement on bandwidth, the average bandwidth occupation is not high, and the ad hoc network relay link can perform route optimization aiming at different calling options, so that the optimal forwarding path is ensured, unnecessary flooding processing is reduced, and the transmission efficiency is improved. Meanwhile, jitter caused by ARQ can be overcome by increasing buffer of an application layer and supplementing delay. Therefore, on the basis of AODV, the project researches a set of wireless routing algorithm suitable for voice communication in special fields, improves the voice transmission characteristic of the narrowband ad hoc network system after multi-hop, and further meets the practical requirement.
2) Compression and streaming media transmission
For the integration with existing communication means, the radio station must be adapted in terms of speech, and the speech signal is input by the radio station. In order to meet the voice transmission requirement of the narrowband ad hoc network and avoid blocking and jitter, voice compression with a large compression ratio is required, so that the project adopts an efficient voice compression algorithm to occupy the transmission bandwidth as little as possible and ensure the voice transmission quality. Meanwhile, because a plurality of analog-to-digital conversions exist in the adaptation process of the radio station, the voice signal is seriously lost, and therefore, the related enhancement processing of the voice signal is required to improve the signal-to-noise ratio in a noisy environment, improve the intelligibility and meet the transmission requirement of 3 levels. In the aspect of video, a front-end camera and video coding and decoding are adopted to adapt to a network for H.265 compression, and an H.265 encoder transmits higher-quality network video under limited bandwidth through intra-frame prediction, inter-frame prediction, conversion, quantization, a deblocking filter, entropy coding and other modules.
3) Investigating signal coverage and interference problems
In a wireless networking mode, the research on large-scale networking can be realized without a fixed topological structure and frequency allocation on the networking. In the process of wireless multi-hop transmission, each data packet uses a dynamically generated path, and the frequency used by each hop is also dynamically generated. The network node transmits each data packet while also detecting the best path and radio band that can be used for the next data packet transmission. However, according to the frequency planning, the frequency is abnormally crowded in the UV segment room, so the transmission method with the narrow bandwidth and the low code stream is selected as much as possible in terms of selecting the bandwidth. Considering the transmission requirement of the code stream of the audio and video, a balance strategy must be adopted, the bandwidth is adjusted in a self-adaptive manner according to the business flow state, and the robustness of the trunking communication is preferentially ensured.
4) Hardware platform
The project aims at developing emergency equipment, and comprises embedded system design, network management software development and integration and development of ad hoc network, voice processing, video processing and cluster related problems, and in addition, the problems of adaptation between signals and electromagnetic compatibility are mainly considered. Meanwhile, in order to meet the requirement of an emergency environment, special design is needed for power supply, power consumption, three prevention, weight and the like of the whole equipment.
Key common property solving technology
1) According to the characteristics of airtime such as simplex broadcasting station, channel preemption, cluster grouping and the like of the radio station, aiming at the characteristics of dynamic and maneuvering of the voice forwarding node, how to improve a routing algorithm, overcome network load caused by a large amount of path flooding in the process of network strip distribution and extension, and improve transmission efficiency and communication quality;
2) The study was performed in a multi-hop or cascade format (reference format: the communication guarantee of a 300-meter channel or a field (which means a radius is more difficult) is realized in a mode of at most 5 hops), and how to meet the transmission of a narrow-band ad-hoc network cluster signal and a video signal by utilizing cross-layer optimization and adaptive bandwidth adjustment of a network layer and an application layer;
3) Planning is put in according to the frequency of the cluster radio station, a proper judgment and selection mechanism is researched to realize signal forwarding, and meanwhile, the problems related to self-excitation loop, frequency control and the like are solved, so that the purposes of relay extension and elimination of communication dead angles are achieved.
In this embodiment, in order to flexibly install an ad hoc network, a movable monomer installation structure is adopted for nodes of the ad hoc network. As shown in fig. 6-11, including node device shell 1 and mounting panel shell 2, mounting panel shell 2 diameter is greater than node device shell 1, 2 lateral wall tip of mounting panel shell is equipped with enstrophe's marginal structure 3, is equipped with breach 4 on the marginal structure 3, is equipped with axle 5 in the breach 4, and the cover has sleeve 18 on the axle 5, bushing connection swinging arms 6, bushing connection is in swinging arms 6 middle section, the 6 top of swinging arms is equipped with interior bellied first bead 7, the outer lateral wall of node device shell 1 is equipped with second bead 8, the second bead 8 and the breach 4 quantity and the relative position of node device shell 1 are the same, the inboard first spring 10 that is equipped with in swinging arms 6 bottom is supported on mounting panel shell 2.
Specifically, under the condition that mounting panel shell 2 and node equipment shell 1 separate, because the existence of first spring 10, first spring 10 jack-up swinging arms 6 bottom, and at this moment, swinging arms 6 bottom is inside, and the swinging arms 6 top is outside, and it is on mounting panel shell 2 to present that swinging arms 6 inclines, and is located mounting panel shell 2 outside in the vertical direction in swinging arms 6 top, and the swinging arms 6 bottom is located the inside of mounting panel shell 2 in the vertical direction.
The installation plate is fixed on the top of a wall or other fixed positions, the node equipment shell 1 is held, because the oscillating rod 6 is inclined, the diameter of the body of the node equipment shell 1 is smaller than that of the installation plate shell 2, when the node equipment shell 1 is contacted with the installation plate shell 2, the top of the oscillating rod 6 is positioned outside the node equipment shell 1, the diameter of the node equipment shell 1 is slightly smaller than the diameter of the installation plate shell 2 minus an inward-turned edge structure 3, the specific diameter is arranged according to specific conditions, when the node equipment shell 1 is required to be embedded on the installation plate shell 2, the node equipment shell 1 is contacted with the position below the middle part of the oscillating rod 6, and therefore the oscillating rod 6 can be jacked to turn over, when the node equipment shell 1 continuously extends deep, the convex edge at the top of the oscillating rod 6 is clamped after passing through the convex edge structure of the node equipment shell 1, and connection is completed.
The bottom of the node equipment shell 1 is provided with a third rib 9, the third rib 9 and the second rib 8 are located on the same side, and the height of the third rib 9 is higher than that of the second rib 8.
And the second rib 8 and the third rib 9 are rib rings arranged around the node equipment shell 1 in a circle.
The cross sections of the first rib 7, the second rib 8 and the third rib 9 are semicircular.
Existence of third bead 9, on the one hand node equipment shell 1 when contacting below the position in the middle part of swinging arms 6, third bead 9 just contacts with swinging arms 6, extrusion swinging arms 6 is ajusted fast, first bead 7 and 8 blocks of second bead need be with the help of external force, at this moment, do not observe the contact condition and also can know and be about to accomplish the equipment, on the other hand, the extrusion of third bead 9 is with 6 top inside oscillations of swinging arms, and finally present vertical state on the inner side, and like this, the slippage has appeared in first bead 7 and the 8 second bead of effectual having avoided.
The quick combination is realized to above-mentioned structure, because the existence of third bead 9, the dismantlement mode adopts and directly pulls out to be bigger for the power that the extrusion needs, for this reason, this embodiment provides a scheme that first bead 7 and second bead 8 are separated by oneself to rotary joint equipment shell 1 realization.
The node equipment comprises a node equipment shell 1 and is characterized in that a plurality of vertical hollow bodies 11 are arranged on the side wall of the node equipment shell 1 of each vertical hollow body 11, a vertical slide rail 12 is arranged on the side wall of the node equipment shell 1, the vertical slide rail 12 is communicated with the vertical hollow bodies 11, a slide block 13 is arranged at the bottom of a third convex edge 9, the slide block 13 penetrates through the vertical slide rail 12 and is clamped in the vertical hollow bodies 11, a second spring 14 is arranged in each vertical hollow body 11, the top of the second spring 14 is connected to the top of the vertical hollow body 11, the bottom of the second spring 14 is connected to the top of the slide block 13, a through hole 15 is formed in the bottom of the vertical hollow body 11, an ejector rod 16 is arranged at the bottom of the slide block 13, the ejector rod 16 penetrates through the through hole 15 and extends to the bottom of the node equipment shell 1, the length of the ejector rod 16 is the same as that of the vertical slide rail 12 and the vertical hollow bodies 11, a plurality of ejector blocks 17 are arranged at the inner bottom of the mounting plate shell 2, the ejector blocks 17 are located under the ejector rod 16, the upper surface of the ejector block 17 is an inclined plane, the lowest end of the inclined plane is not in contact with the bottom of the ejector rod 16, and the highest end of the inclined plane is not in contact with the bottom of the node equipment shell 1.
The top of the vertical hollow body 11 is flush with the second rib 8.
Rotatory node equipment shell 1, utilize the inclined plane of kicking block 17 constantly with ejector pin 16 jack-up, ejector pin 16 is with slider 13 jack-up, slider 13 third bead 9 rises, in this application, third bead 9 removes to behind 6 middle sections of swinging arms more than, third bead 9 plays leverage, the elasticity influence of spring is received to swinging arms 6 bottom, the slope appears in swinging arms 6, the distance that swinging arms 6 bottom was removed just is the length of third bead 9, and thus, the first bead 7 at swinging arms 6 top and the 8 structure separation of second bead of node equipment, take out node equipment shell 1 fast, treat the back of separating. The mounting plate shell is mounted on a wall or other objects in a connecting mode of glue, screws and the like.
The system performance index is as follows:
1. the method supports 16 channels of analog/digital channels, supports automatic frequency sweep, and forwards power of 4W;
2. five hops complete coverage in a range of 300 meters;
3. the standby time is not less than four hours of working time;
4. the weight is not more than 1.5kg;
5. starting up the machine for 60 seconds and automatically networking;
6. low-voltage alarm display and ad hoc network signal indication;
7. waterproof grade IP55;
the project is faced with the development of communication-related blind area coverage products under emergency occasions, and the products comprise a command box and a plurality of communication nodes. The product solves the problem of the blind area covered by the last hundred meters of radio station. Through the implementation of the project, a prototype is developed, the test and trial of a user unit are completed, and a solid foundation is laid for the large-scale application of the subsequent market.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. Based on narrowband ad hoc network emergency cluster blind area cover system, its characterized in that: the voice and the video are carried in a single-frequency-point ad hoc network, a voice system is divided into an access area, a relay area and a forwarding area, the voice is received through an access area node and is subjected to related preprocessing, a compressed voice stream is sent through the ad hoc network, the relay is sent to the forwarding area through the relay area node, the blind area of the forwarding area is an isolated point or an area, a centralized control unit sends the voice to the forwarding area node after real-time intelligent judgment and selection, the forwarding area node unpacks and reduces the voice and performs up-conversion transmission to complete a forwarding process, the forwarding process of the trunking signal is carried out on the premise of signal judgment and selection, therefore, real-time tracking and control of a trunking channel must be established, and the video signal can be transmitted back to an instruction control box in a single-path or multi-path unicast mode through adaptation and coding;
the radio frequency signal of the trunking signal access area node is subjected to frequency selection, amplification, demodulation and power amplification to output a voice signal, the voice signal is subjected to pre-amplification, then is input into an MCU of a centralized control unit for packaging and is input into an ad hoc network communication unit, the voice signal reaches a forwarding area node after being transmitted by an ad hoc network, is subjected to unpacking and decompressing by a centralized control end, and is amplified and sent into a transmitting unit for modulation and up-conversion processing, judgment and selection, PTT control and voice stream synchronization control are processed by the centralized control unit, a video front end inputs the MCU through video coding to perform media stream queuing and buffering and outputs the media stream to the ad hoc network for transmission, and an opposite end decodes and outputs the media stream, and the video does not have a real-time control part and belongs to a quasi-real-time service, so that corresponding processing is required under a multi-hop environment, and the bandwidth of narrow-band voice information is prevented from being occupied;
the communication system at the Ad hoc network part consists of a wireless Ad hoc network unit, a radio station receiving and transmitting unit, a voice coding and enhancing unit, a centralized control and adapting unit and a video coding unit, wherein a radio frequency signal received by the radio station is received and demodulated to be a baseband voice signal through down-conversion, the voice signal is filtered, amplified and digitalized and then sent to the voice coding unit for compression, a code stream after voice compression is sent to a wireless Ad hoc network data interface, meanwhile, the centralized control is used for judging and selecting to determine a forwarding area node, the forwarding area node is forwarded to a forwarding area after relaying, the forwarding area converts the voice stream into the baseband signal for modulation and up-conversion, and a radio frequency signal is emitted;
the node of the ad hoc network adopts a movable single body mounting structure and comprises a node equipment shell and a mounting plate shell, the diameter of the mounting plate shell is larger than that of the node equipment shell, the end part of the side wall of the mounting plate shell is provided with an inwards-turned edge structure, the edge structure is provided with a notch, a shaft is arranged in the notch, a sleeve is sleeved on the shaft and connected with a swinging rod, the sleeve is connected to the middle section of the swinging rod, the top of the swinging rod is provided with a first convex edge which is convex in the inner part, the outer side wall of the node equipment shell is provided with a second convex edge, the number and the relative position of the second convex edge of the node equipment shell are the same as those of the notch, and the inner side of the bottom of the swinging rod is provided with a first spring which is supported on the mounting plate shell;
the bottom of the node equipment shell is provided with a third rib, the third rib and the second rib are positioned on the same side, and the height of the third rib is higher than that of the second rib;
the node equipment shell side wall is provided with a plurality of vertical hollow bodies, the node equipment shell side wall of each vertical hollow body is provided with a vertical slide way, the vertical slide way is communicated with the vertical hollow bodies, a slide block is arranged at the bottom of a third convex edge, the slide block penetrates through the vertical slide way to be clamped in the vertical hollow bodies, a second spring is arranged in each vertical hollow body, the top of the second spring is connected to the top of each vertical hollow body, the bottom of the second spring is connected with the top of each slide block, a through hole is formed in the bottom of each vertical hollow body, an ejector rod is arranged at the bottom of each slide block and penetrates through the through hole to extend to the bottom of the node equipment shell, the length of each ejector rod, the length of each vertical slide way is the same as that of each vertical hollow body, a plurality of ejector blocks are arranged at the bottom of the mounting plate shell, the ejector blocks are located under the ejector rods, the upper surfaces of the ejector blocks are inclined surfaces, the lowest ends of the inclined surfaces are not in contact with the bottoms of the ejector rods, and the highest ends of the inclined surfaces are not in contact with the bottoms of the node equipment shells.
2. The narrowband ad-hoc network emergency cluster-based blind area coverage system of claim 1, wherein: and the second convex rib and the third convex rib are convex rib rings arranged around the node equipment shell in a circle.
3. The narrowband ad-hoc network emergency cluster-based blind area coverage system of claim 2, wherein: the cross sections of the first convex edge, the second convex edge and the third convex edge are semicircular.
4. The narrowband ad-hoc network emergency cluster-based blind area coverage system of claim 1, wherein: the top of the vertical hollow body is flush with the second convex rib.
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