CN111404578A - Very high frequency transceiver and ground equipment of ground based on GBAS - Google Patents
Very high frequency transceiver and ground equipment of ground based on GBAS Download PDFInfo
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- CN111404578A CN111404578A CN202010492203.2A CN202010492203A CN111404578A CN 111404578 A CN111404578 A CN 111404578A CN 202010492203 A CN202010492203 A CN 202010492203A CN 111404578 A CN111404578 A CN 111404578A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/102—Power radiated at antenna
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
Abstract
The invention provides a very high frequency transceiver based on GBAS, comprising a comprehensive processing module and a forward message sending link and a reverse receiving link which are connected with the comprehensive processing module, wherein the forward message sending link comprises at least two transmitting modules and a radio frequency control module which are sequentially connected in series; the comprehensive processing module receives and analyzes feedback information from a reverse receiving link, compares the analyzed information with corresponding transmitting information, and controls the path selection of the radio frequency control module to carry out active-standby switching if the analyzed information exceeds a preset range. The invention realizes the redundant hot standby and on-line switching capacity of the core module, and has the radio frequency channel selection capacity, thereby improving the continuous working capacity of the system; and has the functions of reverse positioning calculation and reverse power verification.
Description
Technical Field
The invention belongs to the technical field of satellite navigation, and particularly relates to a very high frequency receiving and transmitting device based on GBAS and ground equipment of a ground based augmentation system.
Background
The Ground Based Augmentation System (GBAS) is a local Augmentation System for satellite navigation, and can be used to provide positioning navigation services during the precise approach, landing and Ground taxiing phases of an airplane. The System comprises a ground base station System, an airborne System and a Satellite Navigation System (GNSS). The ground base station system is used for capturing satellite signals of the GNSS, and the satellite signals are broadcasted to the airborne system by using Very-high frequency Data Broadcast (VDB) equipment after differential processing. Therefore, the VDB equipment is an important component of the ground base station system and plays a key role in whether the GBAS can provide precise approach and landing service for the airplane.
The GBAS (Ground-Based Augmentation System) improves the precision (reaching the meter level) of a satellite navigation System through a differential positioning technology, and improves performance indexes such as integrity, continuity, availability and the like of the System through a series of measures, so that an airplane provided with corresponding airborne equipment in an airport coverage airspace range obtains I-type or even higher-standard precision approach landing guidance service.
The airborne equipment is a multi-mode receiver, and performs differential positioning calculation and integrity alarm judgment processing by receiving a satellite navigation signal and a differential enhancement message broadcast by ground equipment, so as to generate guidance information required by the aircraft, as shown in fig. 2.
Among the performance indexes of the GBAS system, the continuity is the capability of the system to continuously work in a fault-free alarm state, and the better the continuity index is, the higher the reliability of the system is, which is especially important in an approaching landing system with high safety requirements. The continuous broadcasting capability of the differential enhanced message is an important component of the continuity index.
In addition, generally, the existing differential station receives the text data of the VDB transmitting station by connecting the VDB receiving station with the radio frequency antenna, so as to verify the correctness of the text data, but the method cannot accurately judge the actual broadcast power of the VDB transmitting station, so that the coverage of the very high frequency signal cannot be ensured, and the system cannot detect integrity and safety. In addition, the existing differential stations do not have the function of reverse positioning calculation, and great risks exist in the integrity, continuity and availability of differential correction data of a telegraph broadcast by the ground base station.
Disclosure of Invention
In view of the above, the present invention is directed to providing a GBAS-based very high frequency transceiver and ground based augmentation system ground device to improve the continuity of the whole GBAS system and solve the problems that VDB devices cannot verify whether broadcast messages are correct, cannot accurately detect transmission power, and cannot verify whether positioning data are accurate.
In order to solve the problems, the core idea of the invention is as follows: the closed loop verification inside the very high frequency transceiver is combined with the main/standby switching mode to improve the continuity and the verification of various information.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, the present invention provides a GBAS-based very high frequency transceiver device, which comprises an integrated processing module, and a forward message transmission link and a reverse reception link connected thereto,
the forward message sending link comprises at least two transmitting modules and a radio frequency control module, and the transmitting modules receive the message data from the comprehensive processing module and send the message data in a broadcast mode; the radio frequency control module receives the control signal of the comprehensive processing module to selectively output a plurality of transmitting modules so as to realize the active-standby switching;
the comprehensive processing module receives and analyzes feedback information from a reverse receiving link, compares the analyzed information with corresponding transmitting information, and controls the path selection of the radio frequency control module to carry out active-standby switching or carries out error alarm to control the transmitting module to stop transmitting if the analyzed information exceeds a preset range.
Further, the system also comprises a clock distribution module, wherein the clock distribution module is connected with the transmitting module and the receiving module of the reverse receiving link; the comprehensive processing module analyzes the feedback information to obtain field intensity information, time slot information and message information, compares the field intensity information, the time slot information and the message information with corresponding information in the transmitting information according to a certain sequence, and controls the path selection of the radio frequency control module to carry out active-standby switching if any one exceeds a preset range.
Furthermore, the comprehensive processing module comprises a reverse positioning resolving module, and the simulated airborne equipment carries out reverse resolving on the broadcasted telegraph text data to obtain position information; the comprehensive processing module analyzes the feedback information to obtain power information and message information, compares the power information, the position information and the message information with corresponding information in the transmitting information according to a certain sequence, and if any one comparison result exceeds a preset range, performs corresponding error warning and controls the transmitting module to stop transmitting.
Furthermore, the reverse receiving link comprises receiving modules, and a wired feedback part and a wireless feedback part which are connected with the receiving modules, wherein the number of the receiving modules is at least two, and the receiving modules are connected with the comprehensive processing module to realize the active-standby switching; the output end of the radio frequency control module is sequentially connected with the coupler, the lightning arrester and the transmitting antenna; the wired feedback part comprises at least one of two paths of signals, one path of signals comprises a first power divider and a first attenuator which are sequentially connected with a receiving module, and the first attenuator is connected with a radio frequency control module of the forward message sending link; the other path of the forward message comprises a second power divider and a second attenuator which are sequentially connected with a receiving module, wherein the second attenuator is connected with a coupler of the forward message sending link; the wireless feedback part comprises a third power divider, a lightning arrester and a VDB receiving antenna which are sequentially connected with the receiving module.
In a second aspect, the present invention provides a ground based augmentation system ground device, including the GBAS-based vhf transceiver device described above.
Compared with the prior art, the very high frequency transceiver has the following advantages:
(1) the very high frequency transceiver device of the invention realizes the redundant hot standby and on-line switching capability of the core module, has the radio frequency channel selection capability, automatically selects the corresponding radio frequency channel and is connected with the VHF transmitting antenna according to the main and standby states of the radio station, so that the radio frequency channel can be automatically switched to the standby core module when the main core module fails, the whole process ensures that the broadcasting service provided by the device is not interrupted, thereby improving the continuous working capability of the system.
(2) The very high frequency transceiver has comprehensive processing capacity, realizes data interaction between the device and other components of the system and modules inside the device, simplifies complex interface relation, reduces the complexity of the system and improves the reliability of the system.
(3) The very high frequency transceiver of the invention has clock distribution capability, can provide synchronization for the transmitting and receiving modules of the radio station, and verifies the time slot information.
(4) The very high frequency transceiver has the function of reverse test of the power of the transmitting radio station, and feeds back power signals to the VDB receiving radio station in a wired mode and a wireless mode, and compared with the feedback signals of a wireless link, the feedback signals of the wired link are less interfered by the external environment, have less power loss, can reflect the actual transmitting power more truly, and improve the accuracy of the test result.
(5) The VHF transceiving equipment has a reverse positioning resolving function on the premise of not needing auxiliary monitoring equipment, simulates airborne equipment, performs reverse resolving on the broadcasted message data, and compares the resolved position data with the actual position data so as to verify the usability of the broadcasted message data.
(6) The very high frequency transceiver of the invention carries out power check on all used transmitting radio stations, and has the capability of switching to available transmitting radio stations on line in real time when the main transmitting radio station has a fault, thereby improving the continuity and the availability of the system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a very high frequency transceiver according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a GBAS system;
FIG. 3 is a schematic diagram of a GBAS ground facility according to embodiment 1 of the present invention;
fig. 4 is a relationship diagram of internal modules of the vhf transceiver apparatus according to embodiment 1 of the present invention;
fig. 5 is a flowchart of the operation of the vhf transceiver apparatus according to embodiment 1 of the present invention;
fig. 6 is a flow chart of the primary/standby confirmation and online switching of the transmission module of the vhf transceiver in embodiment 1 of the present invention;
fig. 7 is a relationship diagram of internal modules of the vhf transceiver apparatus according to embodiment 2 of the present invention;
fig. 8 is a flowchart of the operation of the vhf transceiver according to embodiment 2 of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The core concept of the invention is as follows: a very high frequency transceiver based on GBAS, the device composition is shown in fig. 1, and mainly includes three modules: the device comprises a comprehensive processing module, a transmitting module and a receiving module. The comprehensive processing module receives the GNSS signal, the GNSS signal is processed and then sent to the transmitting module, the transmitting module broadcasts differential correction data, and the receiving module receives the data of the transmitting module and feeds the data back to the comprehensive processing module to form closed-loop verification inside the very high frequency transceiver.
A GBAS-based vhf transceiver apparatus according to embodiment 1 of the present invention, as shown in fig. 4, includes an integrated processing module, and a forward packet transmission link and a reverse packet reception link connected thereto,
the forward message sending link comprises two transmitting modules, a radio frequency control module, a coupler, a lightning arrester and a transmitting antenna which are sequentially connected in series, and the transmitting modules receive the message data from the comprehensive processing module and send the message data in a broadcasting mode; the radio frequency control module receives the control signal of the comprehensive processing module to selectively output a plurality of transmitting modules so as to realize the active-standby switching;
the comprehensive processing module receives and analyzes feedback information from a reverse receiving link, compares the analyzed information with corresponding transmitting information, and controls the path selection of the radio frequency control module to carry out active-standby switching or carries out error alarm to control the transmitting module to stop transmitting if the analyzed information exceeds a preset range;
specifically, the system further comprises a clock distribution module, wherein the clock distribution module is connected with the transmitting module and the receiving module of the reverse receiving link; the clock distribution module is mainly used for receiving time service information of time management equipment of ground equipment of the ground-based augmentation system and distributing the time service information to the plurality of radio station modules in the VDB equipment so that transmission and reception can be kept synchronous;
as shown in fig. 6, the integrated processing module analyzes the feedback information to obtain field strength information, time slot information, and message information, compares the field strength information, the time slot information, and the message information with corresponding information in the transmission information in a certain order, and controls the path selection of the radio frequency control module to perform active/standby switching if any one exceeds a preset range.
The reverse receiving link comprises at least two receiving modules and a wired feedback part connected with the receiving modules, and the receiving modules are connected with the comprehensive processing module to realize active-standby switching; the wired feedback part comprises at least one of two paths of signals, one path of signals comprises a first power divider and a first attenuator which are sequentially connected with a receiving module, and the first attenuator is connected with a radio frequency control module of the forward message sending link; and the other path of the forward message comprises a second power divider and a second attenuator which are sequentially connected with a receiving module, and the second attenuator is connected with the coupler of the forward message sending link.
Specifically, in the examples:
the radio station comprises two transmitting modules and two receiving modules, wherein one of the two transmitting modules is a main module, the other is a standby module, the determination of the main module and the standby module is completed by the comprehensive processing module, only the main transmitting module is used for broadcasting the difference and integrity enhancement messages, and the two receiving modules simultaneously work for receiving the sent messages;
the comprehensive processing module has the main functions of data forwarding, primary and standby determination and online switching of radio stations, and state receiving and control of the radio frequency control module. The data forwarding comprises the steps of reporting working state information (including reference clock states) of 4 radio station modules, access state information of a radio frequency control module, message information received by two receiving modules and the like to a GBAS comprehensive processing module, and forwarding a differential and integrity enhancement message sent by the comprehensive processing module to a main transmitting module;
the main-standby determination and online switching of the radio station module are mainly based on the working state information of the transmitting module and the loop receiving condition of the message, when the main transmitting module fails or data received by two receiving module loops are abnormal, the main transmitting module is switched to the standby transmitting module, and the standby transmitting module is switched to the main transmitting module, namely, the main-standby online switching is completed; after the main transmitting module determines that the corresponding radio frequency channel needs to be selected, the process is completed by the comprehensive processing module controlling the radio frequency control module through the GPIO. In order to prevent the misoperation caused by the level jitter, the control of the GPIO is realized by adopting a plurality of clock edges, for example, 3 and 4 continuous rising edges are adopted to respectively control two channel states. Meanwhile, the channel state of the radio frequency control module is also reported to the comprehensive processing module through the GPIO, and after the comprehensive processing module confirms that the radio frequency channel state is correct, the difference and integrity enhancement message can be broadcasted through the switched main transmitting radio module.
The method comprises the following specific working steps:
preparation work before use:
1. the VDB device of the present invention is connected to the GBAS system according to fig. 3, wherein two data interfaces are respectively connected to the data processing modules 1 and 2, a clock interface is connected to the time system device, and an antenna interface is connected to the VDB transmitting antenna.
2. And measuring the attenuation value of a radio frequency path between the transmitting module and the receiving module in the VDB equipment for the basis of field intensity detection.
3. Each component device is respectively electrified, the system state is checked, the working states, the reference clock states and the access states of the radio frequency control modules of the 4 radio station modules can be obtained from the VDB device, and the working states, the reference clock states and the access states are all normal.
As shown in fig. 5, the work flow of the ground enhancement system ground equipment is as follows:
1. the system is powered on, the reference receiver receives satellite signals and starts to generate information such as observed quantity, the comprehensive processing module receives the observed quantity information and calculates to generate difference and integrity enhancement messages, and the time-series equipment tracks the satellite signals and outputs clock signals to all the equipment.
2. The VDB device receives the difference and integrity enhancement message sent by the main data processing module through the comprehensive processing module and forwards the message to the main radio station transmitting module.
3. And the clock distribution module receives the clock signal sent by the system and distributes the clock signal to the 4 station modules.
4. The main radio station transmitting module divides the time slot to broadcast the message through the VDB transmitting antenna by taking the clock as a reference through the path selected by the radio frequency control module.
As shown in fig. 6, the primary/standby confirmation and online switching process of the transmission module:
1. the VDB equipment is powered on, and all the component modules start to work.
2. The comprehensive processing module receives the working state information of the 2 radio station transmitting modules, selects one transmitting module without faults as a main use, and selects the first transmitting module as the main use if both the two transmitting modules have no faults.
3. And the comprehensive processing module receives the differential enhanced message sent by the comprehensive processing module and broadcasts the differential enhanced message through the main transmitting module.
4. Two radio receiving modules receive the message signal coupled by the transmitting module, and report the message signal to the comprehensive processing module after analysis
5. And the comprehensive processing module analyzes the data reported by the receiving module to obtain the field intensity, time slot, message content and the like of the signal, and compares the field intensity, time slot, message content and the like with the transmitted signal.
6. Subtracting the receiving path attenuation (fixed value) from the transmitting power of the transmitting module, taking the value as the center to obtain the value range (such as upper and lower 3 dB) of the received signal field intensity, and judging that the signal is abnormal if the actual received signal field intensity value exceeds the range.
7. And comparing the time slot of the received signal with the time slot of the transmitted signal, and if the time slots are not consistent, judging that the signal is abnormal.
8. And comparing the content of the received signal with the content of the transmitted signal, and if the content of the received signal is inconsistent with the content of the transmitted signal, judging that the signal is abnormal.
9. And if the signal is judged to be abnormal, executing the switching of the main and standby transmitting modules, and selecting a radio frequency channel according to the switching state.
10. And jumping to the step 3 to continue the execution.
A GBAS-based vhf transceiver apparatus according to embodiment 2 of the present invention, as shown in fig. 7, includes an integrated processing module, and a forward packet transmission link and a reverse packet reception link connected thereto,
the forward message sending link comprises two transmitting modules, a radio frequency control module, a coupler, a lightning arrester and a transmitting antenna which are sequentially connected in series, and the transmitting modules receive the message data from the comprehensive processing module and send the message data in a broadcasting mode; the radio frequency control module receives the control signal of the comprehensive processing module to selectively output a plurality of transmitting modules so as to realize the active-standby switching;
the comprehensive processing module receives and analyzes feedback information from a reverse receiving link, compares the analyzed information with corresponding transmitting information, and controls the path selection of the radio frequency control module to carry out active-standby switching or carries out error alarm to control the transmitting module to stop transmitting if the analyzed information exceeds a preset range;
the reverse receiving link comprises receiving modules, a wired feedback part and a wireless feedback part which are connected with the receiving modules, wherein the number of the receiving modules is at least two, and the receiving modules are connected with the comprehensive processing module to realize the active-standby switching;
the wired feedback part comprises two paths of signals, one path of signals comprises a first power divider and a first attenuator which are sequentially connected with a receiving module, and the first attenuator is connected with a radio frequency control module of the forward message sending link; the other path of the forward message comprises a second power divider and a second attenuator which are sequentially connected with a receiving module, wherein the second attenuator is connected with a coupler of the forward message sending link; the wireless feedback part comprises a third power divider, a lightning arrester and a VDB receiving antenna which are sequentially connected with the receiving module.
In one preferred embodiment, the comprehensive processing module comprises a reverse positioning resolving module, and the simulated airborne equipment performs reverse resolving on the broadcasted message data to obtain position information; as shown in fig. 6, the integrated processing module analyzes the feedback information to obtain power information and message information, compares the power information, the location information, and the message information with corresponding information in the transmission information in a certain order, and performs a corresponding error alarm and controls the transmission module to stop transmitting if any one of the comparison results exceeds a preset range.
The radio frequency control module in the embodiment of the invention can select a waveband switch.
In embodiment 2 of the present invention, the operation is performed according to the device connection diagram shown in fig. 7, and it is mainly determined whether the vhf transceiver device can perform reverse power verification and positioning calculation on the navigation message data broadcast by the integrated processing module.
Before connecting the devices, appropriate device parameters should be selected so that they meet system performance requirements.
Specifically, two VDB transmitting radio stations are selected, and one station is used as a host and the other station is used as a standby in normal work. The host provides two functions: firstly, broadcast telegraph text data to user equipment and a VDB receiving station; secondly, the power signal is fed back to the VDB receiving station in a wired mode and a wireless mode. And the standby machine only feeds back a power signal to the VDB receiving station in a wired mode. In addition, in actual airport implementations, the power of the VDB transmitting station should be sufficient to cover the airport aircraft approach landing area.
The VDB transmit antenna and VDB receive antenna are mounted to meet the allowable length of rf antenna and transmitter and receiver communication cables and acceptable transmission signal loss.
The band switch supports an alternative mode of an output end under the control signal of the comprehensive processing module and is used for switching to another VDB transmitting radio station when one VDB transmitting radio station has a fault.
Before determining the parameters of the attenuator, the actual output power of each port is detected by a frequency spectrograph, and the bearing capacity of the attenuator is determined according to the actual power so that the used equipment meets the system performance requirement.
In particular, to meet the requirement of GBAS redundancy backup, the embodiment includes two VDB receiving stations, and the two VDB receiving stations have a three-channel communication function, and can receive both the feedback signals a and B of the wired link and the feedback signal C of the wireless link. The feedback signal A is a signal of a VDB transmitting radio stand-by machine through a first attenuator, the feedback signal B is a signal of a VDB transmitting radio host machine through a second attenuator, and the feedback signal C is a signal of a receiving antenna through a lightning arrester.
The comprehensive processing equipment of the embodiment has the functions of differential message generation, power feedback verification and positioning data inverse calculation.
Under the conditions of meeting the electrical performance index of the cabinet and avoiding electromagnetic interference, the data processing equipment, the VDB transmitting radio station, the VDB receiving radio station, the band switch, the coupler, the attenuator, the power divider and other equipment are installed on the GBAS cabinet according to the system equipment connection diagram shown in figure 7, and the VDB transmitting antenna and the receiving antenna are erected in a working area.
After the equipment is correctly connected, the system is powered on and started to operate.
The working flow of the device of this embodiment 2 is shown in fig. 8, and is described in detail as follows:
firstly, the integrated processing device detects whether the difference value between the power value of the two paths of transmitting stations received by the wired feedback links (A1, A2, B1 and B2) and the actual power value of the transmitting stations meets the GBAS performance requirement. If the four paths of signals do not meet the system requirements, the link or the algorithm is considered to have problems, and the system sends a power alarm to the user. If one of the signals is satisfied, the system power is considered to be correct.
Further, the comprehensive processing equipment compares the navigation message received by the VDB in the reverse direction with the broadcast message, when the error of the message data is larger than the alarm threshold, the comprehensive processing equipment is automatically switched to another VDB transmitting radio station, if the error of the message data is still detected to be larger than the alarm threshold, the system sends a message error alarm to the user within the specified time, and meanwhile, the radio station stops transmitting. And after the comparison and the text data are correct, reverse positioning calculation is carried out. It should be noted that the alarm threshold can be flexibly selected, the most strict is that an alarm occurs when a 1-bit error occurs, and the alarm threshold can also be selected according to the system requirements.
And finally, the comprehensive processing equipment simulates the positioning resolving function of the airborne equipment, reversely resolves positioning data, compares the positioning data with a known position calibrated in advance by a receiver, determines that the telegraph text data broadcast by the data processing equipment has errors when the difference value of the positioning data and the known position is higher than a threshold value within a certain time, automatically switches to another VDB transmitting radio station, and broadcasts an alarm message to a user by the system if the telegraph text data errors still exist, and the transmitting radio station stops transmitting.
The technical effects of embodiment 2 of the invention are as follows:
1. and the function of reverse checking the power of the transmitting station. Compared with the feedback signal of a wireless link, the feedback signal of the wired link is less interfered by the external environment, has less power loss, can reflect the actual transmitting power more truly, and improves the accuracy of the detection result.
2. The transmitting radio stations carry out power inspection, and when the main transmitting radio station fails, the capability of real-time online switching to the available transmitting radio stations is achieved, and the continuity and the usability of the system are improved.
3. On the premise of not needing auxiliary monitoring equipment, the system has a reverse positioning resolving function, simulates airborne equipment, performs reverse resolving on the broadcasted message data, and compares the resolved position data with actual position data so as to verify the usability of the broadcasted message data.
The functions of the various modules mentioned in all embodiments of the invention are as follows:
a comprehensive processing module which is used for processing the data,
the system is used for sending a differential enhanced message (namely message data) to a VDB sending radio station (namely a sending module), receiving feedback information from a VDB receiving radio station (namely a receiving module) at the same time, and comparing the information sent by the VDB receiving radio station with the information sent by a receiving end so as to verify the correctness of the broadcast message data;
the VDB transmits the station (transmit module),
receiving the text data from the comprehensive processing module and sending the text data in a broadcasting mode, wherein at least two VDB transmitting stations are included, so that the requirement of dual redundancy backup is met;
a radio frequency control module for controlling the radio frequency of the radio frequency signal,
the selection for the radio frequency access is completed by the comprehensive processing module through the control of the GPIO, and after the selection of the radio frequency access state is completed, the radio frequency control module reports the current access state to the comprehensive processing module through the GPIO in a high-low level mode. In the video control module of this embodiment, a band-selectable switch is connected to the input end of the video control module, the integrated processing module, and the VDB transmitting station, and receives a control signal from the integrated processing module, so as to select a plurality of VDB transmitting station signals; for example, the standby transmitting module is connected to a load (radio frequency 2 path), the active transmitting module is connected to a coupler (radio frequency 1 path), one path of the coupler is connected to a transmitting antenna through a lightning arrester, and the other path is connected to two receiving modules through an attenuator and a power divider.
A coupler for coupling the light source to the light source,
the band switch is connected with an output port of the band switch and used for dividing received radio frequency signals into multiple paths unequally, so that the radio frequency signals are ensured to be sent to an antenna with larger power, and the radio frequency signals can be sent to the VDB receiving radio station with smaller power;
the antenna is divided into a VDB transmitting antenna and a VDB receiving antenna, the VDB transmitting antenna is used for transmitting the message data from the comprehensive processing module to airborne equipment and a VDB reverse receiving radio station, and the VDB receiving antenna is used for receiving the message data broadcast by the VDB transmitting radio station;
a lightning arrester is arranged on the base plate,
the lightning arrester is a radio frequency lightning arrester, is connected with the VDB transmitting antenna and the VDB receiving antenna, and is used for preventing data errors, loss and even equipment damage of VDB equipment caused by lightning stroke;
an attenuator, which is provided with a plurality of attenuators,
the pulse-resistant energy absorption device is connected in a feedback loop, can resist pulses, reduces power and quantitatively absorbs signal energy.
The power divider is used for dividing the power into a plurality of power components,
the method is applied to a reverse receiving link and is used for averagely dividing one path of radio frequency signals into a plurality of paths of signals.
The VDB receives the station (receive),
the input end of the power divider is connected to the output port of the power divider, and the output end of the power divider is connected to the comprehensive processing module, and the power divider is used for receiving the telegraph text data broadcast by the VDB transmitting radio station and feeding the telegraph text data back to the comprehensive processing module.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A very high frequency transceiver based on GBAS is characterized in that the very high frequency transceiver comprises a comprehensive processing module and a forward message sending link and a reverse receiving link connected with the comprehensive processing module,
the forward message sending link comprises at least two transmitting modules and a radio frequency control module, and the transmitting modules receive the message data from the comprehensive processing module and send the message data in a broadcast mode; the radio frequency control module receives the control signal of the comprehensive processing module to selectively output a plurality of transmitting modules so as to realize the active-standby switching;
the comprehensive processing module receives and analyzes feedback information from a reverse receiving link, compares the analyzed information with corresponding transmitting information, and controls the path selection of the radio frequency control module to carry out active-standby switching or carries out error alarm to control the transmitting module to stop transmitting if the analyzed information exceeds a preset range.
2. A GBAS-based very high frequency transceiving apparatus according to claim 1, wherein: the clock distribution module is connected with the transmitting module and the receiving module of the reverse receiving link;
the comprehensive processing module analyzes the feedback information to obtain field intensity information, time slot information and message information, compares the field intensity information, the time slot information and the message information with corresponding information in the transmitting information, and controls the path selection of the radio frequency control module to carry out active-standby switching if any one exceeds a preset range.
3. A GBAS-based very high frequency transceiving apparatus according to claim 1, wherein: the comprehensive processing module comprises a reverse positioning resolving module, and the simulated airborne equipment carries out reverse resolving on the broadcasted message data to obtain position information;
the comprehensive processing module analyzes the feedback information to obtain power information and message information, compares the power information, the position information and the message information with corresponding information in the transmitting information, and if any one comparison result exceeds a preset range, performs corresponding error warning and controls the transmitting module to stop transmitting.
4. A GBAS-based very high frequency transceiving apparatus according to claim 1, wherein: the reverse receiving link comprises receiving modules, a wired feedback part and a wireless feedback part which are connected with the receiving modules, wherein the number of the receiving modules is at least two, and the receiving modules are connected with the comprehensive processing module to realize the active-standby switching; the output end of the radio frequency control module is sequentially connected with the coupler, the lightning arrester and the transmitting antenna;
the wired feedback part comprises at least one of the following two paths of signals, wherein one path of signals comprises a first power divider and a first attenuator which are sequentially connected with a receiving module, and the first attenuator is connected with a radio frequency control module of the forward message sending link; the other path of the forward message comprises a second power divider and a second attenuator which are sequentially connected with a receiving module, wherein the second attenuator is connected with a coupler of the forward message sending link;
the wireless feedback part comprises a third power divider, a lightning arrester and a VDB receiving antenna which are sequentially connected with the receiving module.
5. A GBAS-based very high frequency transceiving apparatus according to claim 1, wherein: the reverse receiving link comprises at least two receiving modules and a wired feedback part connected with the receiving modules, and the receiving modules are connected with the comprehensive processing module to realize active-standby switching; the output end of the radio frequency control module is sequentially connected with the coupler, the lightning arrester and the transmitting antenna;
the wired feedback part comprises at least one of two paths of signals, one path of signals comprises a first power divider and a first attenuator which are sequentially connected with a receiving module, and the first attenuator is connected with a radio frequency control module of the forward message sending link; and the other path of the forward message comprises a second power divider and a second attenuator which are sequentially connected with a receiving module, and the second attenuator is connected with the coupler of the forward message sending link.
6. A GBAS-based very high frequency transceiving apparatus according to claim 1, wherein: the radio frequency control module is a wave band switch.
7. Ground based augmentation system ground equipment comprising a GBAS based very high frequency transceiving equipment according to any of claims 1 to 6.
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