Anti-multipath interference instrument landing course beacon system

Abstract

The invention discloses an instrument landing course beacon system capable of resisting multipath interference, and relates to the technical field of air traffic management. The system comprises a signal generation module used for generating a radio frequency signal; the channel signal module and the clearance signal module are used for processing and decomposing the radio frequency signal to obtain a channel correction signal and a clearance correction signal; the signal output module is used for correcting and outputting original channel signals and clearance signals based on the channel correction signals and the clearance correction signals, and the feedback module is used for sampling output signals of the signal output module and comparing the output signals with radio frequency signals to obtain error values. According to the invention, high-precision control and adjustment of the radio frequency signal can be realized, independent and rapid adjustment of the beam shape is realized, the anti-multipath interference capability of the instrument landing system is improved, and the operation efficiency of an airport is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air traffic management, and in particular to an instrument landing system localizer system resistant to multipath interference. Background Art

[0002] Although the aviation industry is increasingly dependent on the Global Navigation Satellite System (GNSS), due to the fragility of GNSS signals, the land-based Instrument Landing System (ILS) is still one of the most reliable navigation systems for civil aviation, guiding aircraft approach and landing. The instrument landing system consists of a localizer and a glide path beacon. The localizer operates in the VHF band of 108MHz to 112MHz to provide horizontal guidance information, and the glide path beacon operates in the UHF band of 328MHz to 336MHz to provide vertical guidance information.

[0003] The working wavelength of the localizer is relatively long, and the signal beam is also wide, which is affected by the multipath interference generated by the airport and its nearby buildings and nearby mountains. Multipath interference is mainly caused by the reflection of the heading signal by large obstacles in the transmission path. The receiver of the airborne instrument landing system receives the superposition signal of the direct signal and the reflected signal. The superimposed reflected signal will cause the signal to be distorted, and the error of the DDM (full name: Difference in Depth Modulation) value containing the aircraft's position information will increase. With the expansion of airports and the increase in buildings, signal multipath reflection interference has become the main problem faced by the instrument landing system of some airports. The heading signal wave is disturbed and distorted, resulting in a decrease in the accuracy of the channel structure, affecting the guidance accuracy of the aircraft during the final approach and landing phase, bringing potential safety hazards to the aircraft and reducing the airport's throughput.

[0004] The current instrument landing system transmitter generates radio frequency signals based on analog technology, with low amplitude and phase control accuracy. Once installed, it is difficult to adjust and can only generate fixed-shape directional patterns, which cannot solve multipath interference from the transmitter. In order to solve the multipath interference of signals, some airports use absorbing materials on the surface of buildings, which requires a large capital investment and affects the lighting and appearance of the building. As the absorbing materials age, the anti-interference ability of the instrument landing system decreases, resulting in reduced accuracy of the channel structure. Summary of the invention

[0005] The embodiment of the present application solves the technical problems in the prior art that the RF signal amplitude and phase control accuracy generated by the localizer beacon is low, each channel cannot be adjusted independently, the beam shape is symmetrical and fixed, and the anti-interference performance is poor by providing an instrument landing localizer system that is resistant to multipath interference.

[0006] In a first aspect, an embodiment of the present application provides an instrument landing localizer system that is resistant to multipath interference, including: a signal generating module, used to generate a radio frequency signal, and input the radio frequency signal into a channel signal module and a clearance signal module; a channel signal module, used to process and decompose the radio frequency signal, obtain a channel correction signal, and input the channel correction signal into a signal output module to realize the correction of the radio frequency signal of the original channel; a clearance signal module, used to process and decompose the radio frequency signal, obtain a clearance correction signal, and input the clearance correction signal into the signal output module to realize the correction of the radio frequency signal of the original clearance; a signal output module, used to receive the channel correction signal and the clearance correction signal, and correct the original channel signal and clearance signal based on the channel correction signal and the clearance correction signal to obtain an output signal.

[0007] In combination with the first aspect, in a possible implementation, the signal generating module includes a controller and a signal generating unit; the controller is used to generate a control instruction, and reset the data in the internal cache area based on the control instruction, and periodically obtain the corresponding value in the phase amplitude table; the signal generating unit is used to perform digital-to-analog conversion based on the corresponding value to obtain a radio frequency signal, and input the radio frequency signal into the channel signal module and the clearance signal module.

[0008] In combination with the first possible implementation manner of the first aspect, in a second possible implementation manner, it further includes: a feedback unit, which is used to sample the output signal, obtain a feedback signal, and input the feedback signal into the signal generating unit.

[0009] In combination with the second possible implementation method of the first aspect, in a third possible implementation method, the signal generating unit is also used to compare the feedback signal and the RF signal to obtain an error value, and adjust the control instruction in real time based on the error value; wherein the control instruction includes a frequency control word, a phase control word and an amplitude control word; and the feedback signal includes a feedback phase and a feedback amplitude.

[0010] In combination with the third possible implementation method of the first aspect, in a fourth possible implementation method, the signal generating unit is further used to compare the RF signal based on the feedback phase and the feedback amplitude to obtain an error value between the feedback phase and the RF signal, and an error value between the feedback amplitude and the RF signal; adjust the phase control word in real time based on the error value between the feedback phase and the RF signal; and adjust the amplitude control word in real time based on the error value between the feedback amplitude and the RF signal.

[0011] In combination with the first aspect, in a fifth possible implementation manner, the radio frequency signal includes a channel carrier plus sideband signal, a channel sideband signal, a gap carrier plus sideband signal, and a gap sideband signal.

[0012] In combination with the fifth possible implementation method of the first aspect, in a sixth possible implementation method, the channel correction module includes: a channel power amplifier, used to receive the channel carrier plus sideband signal and the channel sideband signal, and power amplify the channel carrier plus sideband signal and the channel sideband signal; a channel filter, used to filter and merge the power-amplified channel carrier plus sideband signal and the channel sideband signal to obtain a channel correction signal.

[0013] In combination with the fifth possible implementation method of the first aspect, in a seventh possible implementation method, the gap signal module includes: a gap power amplifier, used to receive the gap carrier plus sideband signal and the gap sideband signal, and power amplify the gap carrier plus sideband signal and the gap sideband signal; a gap filter, used to filter and merge the power-amplified gap carrier plus sideband signal and the gap sideband signal to obtain a gap correction signal.

[0014] In combination with the first aspect, in an eighth possible implementation, the signal output module includes: an antenna allocation unit, used to complete the allocation of the communication link based on the channel correction signal and the clearance correction signal, and obtain an allocation result; an antenna array, used to output the channel correction signal and the clearance correction signal based on the allocation result, so as to complete the correction of the original channel signal and clearance signal and obtain the output signal.

[0015] In combination with the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, the antenna allocation unit is further configured to obtain the amplitude and phase of each communication link based on the nulling technology according to the number of obstacles.

[0016] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0017] The embodiment of the present application realizes an instrument landing localizer system that is resistant to multipath interference. The generated RF signal has high amplitude and phase control accuracy, and each channel can be adjusted independently. The beam shape can be easily adjusted for obstacles specific to different airports, thereby improving the system's ability to resist multipath interference and achieving stable performance. This makes the airport critical area smaller, allowing aircraft queuing for takeoff to be closer to the waiting line of the runway, allowing the construction of buildings such as hangars in areas prohibited by traditional instrument landing systems, reducing site selection requirements, and improving airport operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A system structure diagram of an instrument landing localizer system resistant to multipath interference provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a beamforming method for resisting multipath interference provided in an embodiment of the present application;

[0021] Figure 3 A flowchart of a specific implementation method of an instrument landing localizer system resistant to multipath interference provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Figure 1 The system structure diagram of the instrument landing localizer system with multipath interference resistance provided in the embodiment of the present application. Figure 1 As shown, the instrument landing localizer system includes:

[0024] The signal generating module is used for generating radio frequency signals and inputting the radio frequency signals into the channel signal module and the clearance signal module.

[0025] The channel signal module is used to process and decompose the radio frequency signal to obtain a channel correction signal, and input the channel correction signal into the signal output module to realize the correction of the radio frequency signal of the original channel.

[0026] The clearance signal module is used to process and decompose the radio frequency signal to obtain a clearance correction signal, and input the clearance correction signal into the signal output module to realize the correction of the original clearance radio frequency signal.

[0027] The signal output module is used to receive the course correction signal and the clearance correction signal, and correct the original course signal and the clearance signal based on the course correction signal and the clearance correction signal to obtain an output signal.

[0028] The embodiment of the present application provides an instrument landing localizer system that is resistant to multipath interference, and the radio frequency signal generated by the signal generation module is input into the channel signal module and the clearance signal module respectively, so as to realize the signal correction of the channel part and the signal correction of the clearance part, and at the same time, the output signal of the instrument landing localizer system is output in the signal output module based on the correction result. The beam is corrected in real time, and the channel signal and clearance signal are adjusted, so as to reduce the reflection interference of the signal multipath, realize the independent adjustment of each channel, improve the anti-multipath interference capability of the instrument landing localizer system, improve the safety of the aircraft during landing, and thus improve the operation efficiency of the airport.

[0029] In an embodiment of the present application, the signal generating module includes a controller and a signal generating unit.

[0030] The controller is used to generate control instructions, and reset the data in the internal buffer area based on the control instructions, and periodically obtain the corresponding values ​​in the phase amplitude table.

[0031] The signal generating unit is used to perform digital-to-analog conversion based on the corresponding value to obtain a radio frequency signal, and input the radio frequency signal into the channel signal module and the clearance signal module.

[0032] Exemplarily, the controller generates control instructions according to the station frequency, modulation index and other requirements and based on the Nyquist sampling theorem. The control instructions include frequency control words, phase control words and amplitude control words. At the same time, under the action of the internal crystal oscillator clock, the data in the internal cache area of ​​the controller is periodically reset through the control instructions, and each reset generates a corresponding value in the phase amplitude table in the internal memory.

[0033] After receiving the corresponding values ​​in the phase amplitude table in the controller, the signal generating unit performs digital-to-analog conversion on the corresponding values ​​to obtain radio frequency signals, and inputs the radio frequency signals into the channel signal module and the clearance signal module.

[0034] It should be noted that the radio frequency signal includes a channel carrier plus sideband signal (CR CSB), a channel sideband signal (CRSBO), a clearance carrier plus sideband signal (CL CSB) and a clearance sideband signal (CL SBO).

[0035] Specifically, the CSB (full name: Carrier Plus Sideband Signal) signal is a carrier plus sideband signal, which is a common AM modulated wave, and the modulation signal is 90Hz~150Hz (the CSB signal of the channel also has an identification signal modulation).

[0036] The SBO (Sideband Only Signal) signal is a pure sideband wave with suppressed carrier. The modulation signal is 90Hz~150Hz. Since the carrier phase is in the direction of zero crossing of each modulation signal, the output signal does not contain a carrier.

[0037] The core of the signal generation unit is direct digital synthesis (DDS). There are two main methods to implement direct digital synthesis: FPGA-based direct digital synthesis or dedicated direct digital synthesis chips, such as the AD9959 chip produced by ADI. Direct digital synthesis DDS uses the same clock, so that each channel can be adjusted independently.

[0038] In an embodiment of the present application, the instrument landing localizer system further includes a feedback unit, which is used to sample the output signal, obtain a feedback signal, and input the feedback signal into the signal generating unit.

[0039] The signal generating unit compares the feedback signal with the radio frequency signal to obtain an error value, and adjusts the control instruction in real time based on the error value.

[0040] Exemplarily, the feedback unit samples the output signal sent by the signal output module to obtain a feedback signal.

[0041] The feedback signal includes a feedback phase and a feedback amplitude.

[0042] The signal generating unit compares the feedback phase with the RF signal to obtain the error value between the feedback phase and the RF signal, and adjusts the phase control word in real time based on the error value, and then performs digital-to-analog conversion on the adjusted phase control word to obtain an updated RF signal.

[0043] Similarly, the signal generating unit compares the feedback amplitude with the RF signal to obtain the error value between the feedback amplitude and the RF signal, and adjusts the amplitude control word in real time based on the error value, and then performs digital-to-analog conversion on the adjusted amplitude control word to obtain an updated RF signal.

[0044] In the embodiment of the present application, the course correction module includes:

[0045] The channel power amplifier is used for receiving the channel carrier plus sideband signal and the channel sideband signal, and performing power amplification on the channel carrier plus sideband signal and the channel sideband signal.

[0046] The channel filter is used to filter and combine the channel carrier plus sideband signal and the channel sideband signal after power amplification to obtain a channel correction signal.

[0047] Exemplarily, the power amplifier is an electronic amplifier used to increase the power of the radio frequency signal mentioned in the embodiments of the present application. Specifically, the channel power amplifier amplifies the channel carrier plus sideband signal and the channel sideband signal to meet the electric field strength requirements of the coverage area of ​​the channel portion.

[0048] In an embodiment of the present application, the clearance signal module includes:

[0049] The gap power amplifier is used for receiving the gap carrier plus sideband signal and the gap sideband signal, and performing power amplification on the gap carrier plus sideband signal and the gap sideband signal.

[0050] The gap filter is used to filter and combine the gap carrier plus sideband signal and the gap sideband signal after power amplification to obtain a gap correction signal.

[0051] Exemplarily, the gap power amplifier performs power amplification on the gap carrier plus sideband signal and the gap sideband signal to meet the requirement on the electric field strength of the coverage area of ​​the gap part.

[0052] Specifically, clearance refers to the flight area outside the instrument landing localizer system's course sector, where the modulation difference DDM is required to produce a full-scale deflection of the course deviation indicator. When the modulation difference is too low, the indicator is less than the full-scale deflection, which is a low clearance state.

[0053] It should be noted that both the channel amplifier and the clearance amplifier are dual-channel amplifiers with the same architecture and good consistency. The power amplification process uses pre-distortion technology to reduce volume and power consumption and improve linearity.

[0054] Both the channel filter and the clearance filter use cavity filters to suppress out-of-band clutter and reduce interference.

[0055] In the embodiment of the present application, the signal output module includes:

[0056] The antenna allocation unit is used to complete the allocation of communication links based on the course correction signal and the clearance correction signal to obtain an allocation result.

[0057] The antenna array is used to output a course correction signal and a clearance correction signal based on the allocation result to complete the correction of the original course signal and clearance signal and obtain an output signal.

[0058] In the embodiment of the present application, the antenna allocation unit is further configured to obtain the amplitude and phase of each communication link based on the nulling technique according to the number of obstacles.

[0059] Exemplarily, the antenna allocation unit decomposes the channel CSB signal, channel SBO signal, clearance CSB signal and clearance SBO signal into N output signals with certain amplitude and certain phase relationship, where N is the total number of antennas in the antenna array. The values ​​of the amplitude and phase of each path in the antenna allocation unit are solved by the nulling technology according to the number and orientation of obstacles in the actual situation.

[0060] Since the frequency range of the RF signal is 108MHz to 112MHz, if the antenna distribution unit is designed using a traditional microstrip line feed network, the overall size of the network will be too large, the branches will be mutually coupled, affecting the amplitude and phase accuracy, and the cost will be high. The embodiment of the present application adopts a lumped component design, and the basic circuit units used include an equal power distribution Π-type network, an LC linear phase filter, a Π-type attenuator, and a directional coupler. The lumped component design has the advantages of small size and high precision in this frequency band.

[0061] The feedback unit collects the output signal of the signal output module through a directional coupler, obtains the amplitude and phase information of each channel through direct RF sampling, and inputs it into the signal generating unit. It is compared with the RF signal output by the signal generating unit to obtain the error value, which is used for channel correction.

[0062] The antenna array uses 20 units or other numbers of broadband log-periodic dipole antennas according to the size of the coverage area. Log-periodic dipole antennas have the characteristics of simple structure, wide bandwidth, narrow radiation beam, and concentrated energy. In addition, the energy radiated backward by the antenna array is at least 26dB lower than the energy radiated forward, so there is no need to configure a huge reflection network.

[0063] In the embodiment of the present application, the signal multipath interference problem to be solved and the principles involved in the solution process are as follows.

[0064] Multipath interference is mainly caused by the reflection of the RF signal sent by the localizer system by large obstacles in the transmission path. The receiver of the airborne instrument landing system receives the superposition signal of the direct signal and the reflected signal. The superimposed reflected signal distorts the signal, increasing the modulation error containing the aircraft's position information.

[0065] Specifically, the influence of the reflected signal on the modulation difference DDM can be obtained by the following formula.

[0066]

[0067] Where DDM is the modulation difference, R is the power ratio of the reflected signal to the direct signal, and DDM direct is the modulation difference of the direct signal, DDM reflect is the modulation error of the reflected signal.

[0068] In order to reduce the influence of the reflected signal on the modulation error, the power ratio R of the reflected signal to the direct signal is reduced. The embodiment of the present application provides a beamforming method for resisting multipath interference, such as Figure 2 As shown, Figure 2 A schematic diagram of a beamforming method for resisting multipath interference provided by the present application. The embodiment of the present application generates an asymmetric radiation field through reasonable beamforming optimization design, forms a null at a specific depth in the direction of the obstacle, reduces the radiation intensity in the direction of the obstacle, and thus reduces the R value.

[0069] Common nulling techniques include: feed unit amplitude and phase control, amplitude control, phase control and array unit control. In the embodiment of the present application, the nulling technique used is feed unit amplitude and phase control, which can form a beam of any shape with high control accuracy.

[0070] Assuming that the total number of antennas in the antenna array in the instrument landing localizer system in the embodiment of the present application is N, the distance between each antenna is d, and there are obstacles in K directions, the directional pattern can be expressed as:

[0071]

[0072] Where E(u) represents the directional pattern, u=kdsinθ, k=1,2...K, n=1,2...N, a n represents the amplitude weighting coefficient, e represents the natural base, and j represents the imaginary number.

[0073] If a zero point needs to be set at the obstacle, the comprehensive expression of adjusting the amplitude and phase weighting of all array elements to zero is as follows.

[0074]

[0075] Solving Δa based on Schmidt orthogonalization method n , the amplitude and phase disturbance values ​​can be obtained, and the amplitude and phase can be controlled simultaneously to achieve zero point. k represents the electric field strength, E(u k ) represents the direction diagram of the electric field strength, Δa n A variable representing magnitude and phase, as a vector.

[0076] Figure 3 A flowchart of a specific implementation method of an instrument landing localizer system that is resistant to multipath interference provided by an embodiment of the present application, such as Figure 3 As shown, the specific implementation method of the system is as follows:

[0077] The controller generates control instructions based on information such as station frequency and modulation.

[0078] The control instruction periodically resets the data in the internal buffer of the controller to generate corresponding values.

[0079] The corresponding value is converted into a digital-to-analog value in the signal generating unit to generate a radio frequency signal.

[0080] The channel signal module processes the channel carrier plus sideband signal and the channel sideband signal in the radio frequency signal to generate a channel correction signal, and corrects the radio frequency signal of the original channel.

[0081] At the same time, the gap signal module processes the gap carrier plus sideband signal and the gap sideband signal in the radio frequency signal to generate a gap correction signal, and corrects the original gap radio frequency signal.

[0082] The corrected results of the channel signal module and the clearance signal module are output to the signal output module, and the signal output module generates an output signal.

[0083] The feedback unit samples the output signal to obtain a feedback signal, and compares the feedback signal with the RF signal to obtain an error value.

[0084] The control command is adjusted in real time based on the error value, and the adjusted control command is reset to output the adjusted corresponding value, thereby realizing real-time correction of the channel signal and the clearance signal.

[0085] Although the present application provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in this embodiment is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in sequence or in parallel according to the method shown in this embodiment or the accompanying drawings (for example, in a parallel processor or multi-threaded processing environment).

[0086] Some modules in the apparatus described in the present application can be described in the general context of computer executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments, in which tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media including storage devices.

[0087] The devices or modules described in the above application embodiments can be implemented by computer chips or entities, or by products with certain functions. For the convenience of description, the above devices are described in various modules according to their functions. When implementing the embodiments of the present application, the functions of each module can be implemented in the same or multiple software and / or hardware. Of course, the module that implements a certain function can also be implemented by combining multiple sub-modules or sub-units.

[0088] The methods, devices or modules described in this application can be implemented in the form of computer-readable program codes. The controller can be implemented in any appropriate manner. For example, the controller can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program codes (such as software or firmware) that can be executed by the (micro) processor, logic gates, switches, application-specific integrated circuits (English: Application Specific Integrated Circuit; Abbreviation: ASIC), programmable logic controllers and embedded microcontrollers. Examples of controllers include but are not limited to the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20 and Silicone Labs C8051F320. The memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art also know that in addition to implementing the controller in a purely computer-readable program code, the controller can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded microcontrollers by logically programming the method steps. Therefore, this controller can be considered as a hardware component, and the devices included in it for implementing various functions can also be regarded as structures within the hardware component. Or even, the means for realizing various functions may be regarded as both a software module for realizing the method and a structure within a hardware component.

[0089] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist independently, or two or more modules may be integrated into one module.

[0090] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary hardware. Based on such an understanding, the technical solution of the present application can be essentially or partly contributed to the prior art in the form of a software product, or it can be reflected in the implementation process of data migration. The computer software product can be stored in a storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a mobile terminal, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0091] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. All or part of this application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld devices or portable devices, tablet devices, mobile communication terminals, multi-processor systems, microprocessor-based systems, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc.

[0092] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An instrument landing localizer system resistant to multipath interference, characterized in that: include: A signal generating module, used for generating a radio frequency signal and inputting the radio frequency signal into a channel signal module and a clearance signal module; The channel signal module is used to process and decompose the radio frequency signal to obtain a channel correction signal, and input the channel correction signal into the signal output module to realize the correction of the radio frequency signal of the original channel; The clearance signal module is used to process and decompose the radio frequency signal to obtain a clearance correction signal, and input the clearance correction signal into the signal output module to realize the correction of the original clearance radio frequency signal; The signal output module is used to receive the course correction signal and the clearance correction signal, and correct the original course signal and the clearance signal based on the course correction signal and the clearance correction signal to obtain an output signal.

2. The system according to claim 1, characterized in that The signal generating module comprises a controller and a signal generating unit; The controller is used to generate a control instruction, and reset the data in the internal buffer area based on the control instruction, and periodically obtain the corresponding value in the phase amplitude table; The signal generating unit is used for performing digital-to-analog conversion based on the corresponding value to obtain a radio frequency signal, and inputting the radio frequency signal into the channel signal module and the clearance signal module.

3. The system according to claim 2, characterized in that Also includes: The feedback unit is used to sample the output signal, obtain a feedback signal, and input the feedback signal into the signal generating unit.

4. The system according to claim 3, characterized in that The signal generating unit is further used to compare the feedback signal with the radio frequency signal to obtain an error value, and to adjust the control instruction in real time based on the error value; Wherein, the control instruction includes a frequency control word, a phase control word and an amplitude control word; The feedback signal includes a feedback phase and a feedback amplitude.

5. The system according to claim 4, characterized in that The signal generating unit is further used to compare the feedback phase and the feedback amplitude with the radio frequency signal to obtain an error value between the feedback phase and the radio frequency signal, and an error value between the feedback amplitude and the radio frequency signal; The phase control word is adjusted in real time based on the error value between the feedback phase and the radio frequency signal; The amplitude control word is adjusted in real time based on the error value between the feedback amplitude and the radio frequency signal.

6. The system according to claim 1, characterized in that The radio frequency signal includes a channel carrier plus sideband signal, a channel sideband signal, a gap carrier plus sideband signal and a gap sideband signal.

7. The system according to claim 6, characterized in that The course correction module comprises: A channel power amplifier, used for receiving a channel carrier plus sideband signal and a channel sideband signal, and performing power amplification on the channel carrier plus sideband signal and the channel sideband signal; The channel filter is used to filter and combine the channel carrier plus sideband signal and the channel sideband signal after power amplification to obtain a channel correction signal.

8. The system according to claim 6, characterized in that The clearance signal module comprises: A gap power amplifier, used for receiving a gap carrier plus sideband signal and a gap sideband signal, and performing power amplification on the gap carrier plus sideband signal and the gap sideband signal; The gap filter is used to filter and combine the gap carrier plus sideband signal and the gap sideband signal after power amplification to obtain a gap correction signal.

9. The system according to claim 1, characterized in that The signal output module comprises: An antenna allocation unit, used to complete the allocation of communication links based on the course correction signal and the clearance correction signal, and obtain an allocation result; The antenna array is used to output a course correction signal and a clearance correction signal based on the allocation result to complete the correction of the original course signal and clearance signal and obtain an output signal.

10. The system according to claim 9, characterized in that The antenna allocation unit is also used to obtain the amplitude and phase of each communication link based on the nulling technology according to the number of obstacles.

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