Ad-hoc network technology-based ADS-B information transmission system network design method

Abstract

The invention discloses an ADS-B (Automatic Dependent Surveillance-Broadcast) information transmission system network design method based on an Ad hoc network technology, and relates to the field of transmission system network design. According to the invention, the overall design thought, composition and principle, workflow, scheme and the like of the system are given, the rapid and reliable transmission of ADS-B information can be realized, the comprehensive transmission and visual display of other service information are supported, the service flexibility, reliability, comprehensiveness and high efficiency of the aeronautical communication system can be improved, and the development of the aeronautical communication system is facilitated. The method is especially suitable for aviation communication requirements in remote areas or in emergency situations, and can generate a greater effect.

Description

Technical Field

[0001] The present invention relates to the field of transmission system network design, and in particular to an ADS-B information transmission system network design method based on self-organizing network technology. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Currently, ADS-B technology is widely used in air traffic management and monitoring, and realizes mutual perception between aircraft by automatically broadcasting aircraft location information, speed, altitude and other data. The traditional ADS-B system relies on ground base stations and satellite networks for data transmission, and has problems such as limited coverage and high cost.

[0004] In the existing technology, fixed ground stations are mostly used to monitor fixed areas. They do not have the ability to be quickly deployed and to handle emergencies. There is a possible problem of ADS-B information transmission being blocked in complex geographical environments. Different equipment is used for ADS-B information data transmission and other business data transmission, resulting in poor compatibility.

[0005] As a communication network that can be quickly deployed without infrastructure, the self-organizing network has broad application prospects in the fields of military, emergency rescue, etc. Therefore, the present invention proposes a network design method for ADS-B information transmission system based on self-organizing network technology, which improves the flexibility and reliability of the system by grafting ADS-B information transmission onto the self-organizing network, and aims to achieve efficient and reliable transmission of ADS-B information through the self-organizing network. This technology can be widely used in automatic dependent surveillance of various aircraft and mutual surveillance. At the same time, it has the ability to transmit other business application data, such as voice, pictures, videos, etc., which is of great significance. Summary of the invention

[0006] The purpose of the present invention is to provide a network design method for an ADS-B information transmission system based on ad hoc networking technology in response to the problems existing in the prior art. While ensuring the transmission of low-latency ADS-B information, it also takes into account the transmission of other business data, such as images and videos, and supports the compatibility of ADS-B automatic dependent surveillance systems and ad hoc network communication systems. It relies on the advantages of ad hoc network communication technology such as anti-destruction, no need for infrastructure, efficient communication, and relayability. At the same time, it adopts a design idea based on the Statistical Priority Channel Access Protocol (SPMA) and takes ADS-B information as the highest level of service level, further improving the automatic dependent surveillance efficiency of multiple aircraft platforms, and taking into account the transmission of other business information.

[0007] The technical solution of the present invention is as follows:

[0008] The network design method of ADS-B information transmission system based on self-organizing network technology includes:

[0009] Design the application layer, network operation layer, data link layer and physical layer; compress, encrypt and set the highest priority for ADS-B information at the application layer; adopt the AODV protocol at the network operation layer to perform different processing after receiving packets are identified; design the SPMA protocol based on statistical priority at the data link layer to transmit data packets according to the channel status; adopt the signal processing architecture based on ADRV9009 for signal processing at the physical layer.

[0010] Furthermore, the physical layer includes: a signal processing module;

[0011] The signal processing module is composed of an ADRV9009 chip, an FPGA, a memory and an interface circuit; the ADRV9009 chip communicates with the FPGA; the memory and the interface circuit also communicate with the FPGA.

[0012] Furthermore, there are three ADRV9009 chips in total, supporting one transmit and five receive.

[0013] Furthermore, the FPGA is an on-chip integrated processing ZYNQ processor.

[0014] Furthermore, the memory includes: DDR3 and EMMC.

[0015] Furthermore, the network operation layer includes: a HELLO module, a RREQ module, a RREP module, a RERR module, and a routing table module, a TIMER module and a cache queue module that provide services for these modules.

[0016] Furthermore, the HELLO module sets a hello_timer timer when the main program is initialized, so as to broadcast a HELLO message once every certain period of time to inform neighboring nodes of the activity of the node; the AODV protocol maintains the route through HELLO messages, link repair, and sending a route error message RERR after the link is disconnected; the AODV protocol needs to use timers in multiple places; the timer queue can be used to call a system timer to achieve the timing of all operations; when an operation that needs to be timed is encountered in the program, a member is added to the timer queue; all members in the timer queue are arranged in the order of timeout time, that is, the member at the head of the team is the member that needs to call the timeout processing most recently; the timer timeout is always set to the timeout time of the member at the head of the team; when the timer times out, the timeout service function of the head member is called for processing, and the head member is deleted at the same time, and the timeout time of the timer is set to the timeout time of the new head of the team;

[0017] The RREQ module is responsible for initiating request information when routing is required, relaying between nodes, and establishing reverse routing to ensure the forwarding of RREP messages, thereby ultimately achieving the establishment of forward routing;

[0018] The RREP module is responsible for operations related to RREP messages, including generation, processing and forwarding of RREP;

[0019] The routing table module is the operational focus of the entire routing protocol, and all operations and mechanisms are performed around the routing table; in the routing table module, the entire AODV protocol directly maintains the routing table of the node, and the routing establishment work is completed by operating the routing table.

[0020] Furthermore, the data link layer is designed based on the SPMA protocol of statistical priority, and the SPMA protocol is regarded as an improved CSMA protocol under the spread spectrum system;

[0021] The CSMA protocol senses the channel status. When the channel is idle, if there is a data packet to be transmitted, the data packet will be sent directly. When the channel is busy, the data packet will be backed off according to the designed protocol and then sent;

[0022] When the transceiver receives a data packet from the application layer, it sends the data packet to a certain sequence for queueing according to the priority. The current channel occupancy statistics will be compared with a certain priority threshold. If it is lower than the threshold, the data will be transmitted. If it is higher than the threshold, the node will wait for a random period of time and then compare the channel occupancy statistics according to the information priority.

[0023] Furthermore, ADS-B information is set to the highest priority to ensure the shortest delay transmission of ADS-B information.

[0024] Furthermore, the design of the application layer includes:

[0025] Compression processing technology, encryption processing technology and the highest priority setting idea are used for ADS-B information, and integrated business processing is carried out with other voice, image and video data according to service levels, among which ADS-B information is level one, voice is level two, image is level three, and video is level four.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention mainly utilizes the network design method of ADS-B information transmission system based on self-organizing network technology in the fields of general aviation and emergency command, and provides the overall design idea, composition and principle, work flow, scheme, etc. of the system, which can solve the problem of fast and reliable transmission of ADS-B information, and support the integrated transmission and visual display with other business information, etc., which can improve the business flexibility, reliability, comprehensiveness and efficiency of the aviation communication system, and is especially suitable for the aviation communication needs in remote areas or emergency situations, and can produce greater effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the ADS-B information transmission network architecture diagram based on self-organizing network technology;

[0029] Figure 2 This is the composition and working original diagram of the ADS-B information transmission system based on self-organizing network technology;

[0030] Figure 3 It is a schematic diagram of the physical layer module composition architecture;

[0031] Figure 4 It is the AODV protocol processing flow chart;

[0032] Figure 5 It is composed of AODV protocol software modules. DETAILED DESCRIPTION

[0033] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0034] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0035] Embodiment 1

[0036] When multiple aircraft are performing missions, the aircraft platform payload generally has a self-organizing network communication module, an ADS-B information generation module, and other application modules. The ADS-B information generation module includes sensors such as GPS receivers, accelerometers, and gyroscopes, which are used to collect aircraft status information; the self-organizing network communication module uses wireless self-organizing network communication to achieve wireless communication between nodes. It can be integrated on a certain aircraft or located in a ground control center, and interact with the self-organizing network nodes through wireless communication to complete the comprehensive track of ADS-B information and other business data processing and visualization display.

[0037] Therefore, this embodiment is designed from the application layer, network operation layer, data link layer and physical layer. The ADS-B information transmission network architecture based on ad hoc network technology is as follows: Figure 1 As shown, the system composition and working principle are as follows Figure 2 shown.

[0038] In this embodiment, specifically, compression processing is performed on the ADS-B information at the application layer (i.e., the ADS-B information is compressed before transmission), encryption processing is performed (i.e., the ADS-B information is encrypted using AES encryption technology during transmission before transmission to ensure the security of ADS-B data), and the highest priority is set (i.e., the ADS-B information is used as the highest level service of the SPMA access service); the AODV protocol is adopted at the network operation layer, and different processing is performed on the received packet after identification, such as: maintaining routing tables, pioneer tables, etc.; an SPMA protocol based on statistical priority is designed at the data link layer, and data packets are transmitted according to the channel status; and a signal processing architecture based on ADRV9009 is adopted at the physical layer for signal processing.

[0039] In this embodiment, specifically, Figure 3 As shown, the physical layer includes: a signal processing module;

[0040] The signal processing module is composed of an ADRV9009 chip, an FPGA, a memory and an interface circuit; the ADRV9009 chip communicates with the FPGA; the memory and the interface circuit also communicate with the FPGA.

[0041] In this embodiment, specifically, there are three ADRV9009 chips in total, which support one transmission and five receptions, meet the requirements of miniaturized design, and are particularly suitable for general aviation or emergency command fields; the ADRV9009 chip supports 70MHz~6GHz and two-way transmission and reception.

[0042] In this embodiment, specifically, the FPGA is an on-chip integrated processing ZYNQ processor.

[0043] In this embodiment, specifically, the memory includes: DDR3 and EMMC.

[0044] In this embodiment, specifically, the AODV protocol processing flow is as follows: Figure 4 As shown; the network operation layer is divided into: HELLO module, RREQ module, RREP module, RERR module and routing table module, TIMER module and cache queue module providing services for these modules according to various messages of the protocol, such as Figure 5 shown.

[0045] In this embodiment, specifically, the HELLO module sets a hello_timer timer when the main program is initialized, so as to broadcast a HELLO message once every period of time to inform neighboring nodes of the activity of the node; the AODV protocol maintains the route through HELLO messages, link repair, and sending a route error message RERR after the link is disconnected; the AODV protocol needs to use timers in many places; the timer queue can be used to call a system timer to achieve the timing of all operations; when an operation that needs to be timed is encountered in the program, a member is added to the timer queue; all members in the timer queue are arranged in order of timeout time, that is, the member at the head of the team is the member that needs to call the timeout processing most recently; the timer timeout is always set to the timeout time of the member at the head of the team; when the timer times out, the timeout service function of the head member is called for processing, and the head member is deleted at the same time, and the timeout time of the timer is set to the timeout time of the new head of the team;

[0046] The RREQ module is responsible for initiating request information when routing is required, relaying between nodes, and establishing reverse routing to ensure the forwarding of RREP messages, thereby ultimately achieving the establishment of forward routing;

[0047] The RREP module is responsible for operations related to RREP messages, including the generation, processing and forwarding of RREPs. RREPs are generated during the pathfinding process. After a node receives a RREQ message, it finds that it knows the routing information to the destination node, or that it is the destination node of this pathfinding. Then, it generates a RREP message and returns it to the sender of the RREQ message.

[0048] The routing table module is the operational focus of the entire routing protocol, and all operations and mechanisms are performed around the routing table; in the routing table module, the entire AODV protocol directly maintains the routing table of the node, and completes the work of establishing the route by inserting, deleting, updating, and other operations on the routing table.

[0049] In this embodiment, specifically, the data link layer designs an SPMA protocol based on statistical priority, and the SPMA protocol is regarded as an improved CSMA protocol under a spread spectrum system;

[0050] The CSMA protocol is commonly used in narrowband systems. The channel state is mainly between busy and idle. By sensing the channel state, when the channel is idle, if there is a data packet to be transmitted, the data packet will be sent directly. When the channel is busy, the data packet will be backed off according to the designed protocol and then sent;

[0051] When the transceiver receives a data packet from the application layer, it sends the data packet to a certain sequence for queueing according to the priority. The current channel occupancy statistics will be compared with a certain priority threshold. If it is lower than the threshold, the data will be transmitted. If it is higher than the threshold, the node will wait for a random period of time and then compare the channel occupancy statistics according to the information priority.

[0052] In this embodiment, specifically, the ADS-B information is set to the highest priority to ensure the shortest delay transmission of the ADS-B information.

[0053] In this embodiment, specifically, the design of the application layer includes:

[0054] Compression processing technology, encryption processing technology and the highest priority setting idea are used for ADS-B information, and integrated business processing is carried out with other voice, image and video data according to service levels, among which ADS-B information is level one, voice is level two, image is level three, and video is level four.

[0055] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0056] This background section is provided to generally present the context of the invention, and the work of the presently named inventors, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art to the present invention.

Claims

1. A network design method for ADS-B information transmission system based on self-organizing network technology, characterized in that: include: Design application layer, network operation layer, data link layer and physical layer; Compress, encrypt and set the highest priority for ADS-B information at the application layer; The AODV protocol is used in the network operation layer to perform different processing after the received packets are identified; The SPMA protocol based on statistical priority is designed at the data link layer to transmit data packets according to the channel status; the signal processing architecture based on ADRV9009 is adopted at the physical layer for signal processing.

2. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 1 is characterized in that: The physical layer includes: a signal processing module; The signal processing module is composed of an ADRV9009 chip, an FPGA, a memory and an interface circuit; the ADRV9009 chip communicates with the FPGA; the memory and the interface circuit also communicate with the FPGA.

3. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 2 is characterized in that: There are three ADRV9009 chips in total, supporting one transmit and five receive.

4. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 2 is characterized in that: The FPGA is an on-chip integrated processing ZYNQ processor.

5. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 2 is characterized in that: The memory includes: DDR3 and EMMC.

6. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 2 is characterized in that: The network operation layer includes: a HELLO module, a RREQ module, a RREP module, a RERR module, and a routing table module, a TIMER module and a cache queue module providing services for these modules.

7. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 6 is characterized in that: The HELLO module sets the hello_timer timer when the main program is initialized, so as to broadcast a HELLO message once every period of time to inform neighboring nodes of the activity of the node; the AODV protocol maintains the route by sending a route error message RERR after the HELLO message, link repair and link disconnection; the AODV protocol needs to use timers in many places; the timing of all operations can be achieved by calling only one system timer through the timer queue; when an operation that needs to be timed is encountered in the program, a member is added to the timer queue; all members in the timer queue are arranged in the order of timeout time, that is, the member at the head of the team is the member that needs to call the timeout process most recently; the timer timeout is always set to the timeout time of the member at the head of the team; when the timer times out, the timeout service function of the head member is called for processing, the head member is deleted at the same time, and the timeout time of the timer is set to the timeout time of the new head of the team; The RREQ module is responsible for initiating request information when routing is required, relaying between nodes, and establishing reverse routing to ensure the forwarding of RREP messages, thereby ultimately achieving the establishment of forward routing; The RREP module is responsible for operations related to RREP messages, including generation, processing and forwarding of RREP; The routing table module is the operational focus of the entire routing protocol, and all operations and mechanisms are performed around the routing table; in the routing table module, the entire AODV protocol directly maintains the routing table of the node, and the routing establishment work is completed by operating the routing table.

8. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 6 is characterized in that: The data link layer is designed based on the SPMA protocol of statistical priority, and the SPMA protocol is regarded as an improved CSMA protocol under the spread spectrum system; The CSMA protocol senses the channel status. When the channel is idle, if there is a data packet to be transmitted, the data packet will be sent directly. When the channel is busy, the data packet will be backed off according to the designed protocol and then sent; When the transceiver receives a data packet from the application layer, it sends the data packet to a certain sequence for queueing according to the priority. The current channel occupancy statistics will be compared with a certain priority threshold. If it is lower than the threshold, the data will be transmitted. If it is higher than the threshold, the node will wait for a random period of time and then compare the channel occupancy statistics according to the information priority.

9. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 8, characterized in that: Set ADS-B information to the highest priority to ensure the shortest delay transmission of ADS-B information.

10. The ADS-B information transmission system network design method based on ad hoc network technology according to claim 8, characterized in that: The design of the application layer includes: Compression processing technology, encryption processing technology and the highest priority setting idea are used for ADS-B information, and integrated business processing is carried out with other voice, image and video data according to service levels, among which ADS-B information is level one, voice is level two, image is level three, and video is level four.

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