Airport GNSS signal interference monitoring system and monitoring method

Abstract

The invention belongs to the technical field of airport scene GNSS signal monitoring, and particularly relates to an airport GNSS signal interference monitoring system and monitoring method.The monitoring system comprises a data processing device and at least three GNSS fixed receiving stations, and each GNSS fixed receiving device comprises a GNSS receiving module; a communication module; the radio frequency monitoring module is used for processing the initial GNSS signal to obtain a real-time power value and a phase; the information processing module is used for analyzing the initial GNSS signal and sending three kinds of signal data obtained through processing and analysis to the data processing device according to needs; and the data processing device is used for realizing at least one of three operations according to the received signal so as to judge whether an interference signal exists in the initial GNSS signal, and is also used for sending out interference alarm information when judging that the interference signal exists. The system can be used independently or in a combined mode according to actual conditions, the flexibility is higher, the monitoring precision can be further improved, and the false alarm rate is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of airport GNSS signal monitoring, and specifically relates to an airport GNSS signal interference monitoring system and monitoring method. Background Art

[0002] The Global Navigation Satellite System (GNSS) can provide services for positioning, navigation and timing (PNT) applications and is widely used in the civil aviation field to support important functions such as aviation navigation, air traffic control, and weather forecasting. At present, the GNSS systems recognized by the International Civil Aviation Organization (ICAO) include four core constellations: the United States' Global Positioning System (GPS), Russia's Global Navigation Satellite System (GLONASS), Europe's Galileo System (Galileo) and my country's Beidou Satellite Navigation System (BDS).

[0003] As the world's second largest aviation market, my country has an average of more than 10,000 flights per day on domestic routes. With such a large scale of flights, aviation operations are highly dependent on efficient control and safety measures. The widespread use of GNSS systems in civil aviation will have a serious impact on my country's civil aviation operations once they are interfered with. In recent years, civil aviation flights and flight check aircraft at many domestic airports have frequently encountered GNSS interference, causing aircraft to lose GNSS signals and the ADS-B systems of some aircraft to malfunction, seriously threatening aviation safety.

[0004] There are a large number of aircraft and vehicles on the airport surface. To ensure efficient and safe operation, most airports rely on surface surveillance systems to monitor and manage aircraft and vehicles. Surface surveillance systems usually rely on GNSS signals for positioning. Therefore, if the GNSS signals are interfered with, it may affect the normal operation of the airport. To this end, it is necessary to achieve rapid and accurate monitoring of GNSS interference on the airport surface and its surrounding areas, so as to take effective preventive and response measures. This is not only the key to improving the safety of aviation operations, but also an important guarantee for ensuring the efficiency and reliability of air transportation.

[0005] GNSS satellites operate in high orbits about 20,000 kilometers above the earth. After long-distance propagation, the signal becomes very weak on the ground and is extremely susceptible to interference. GNSS interference is mainly divided into suppression interference and deception interference. Suppression interference refers to the emission of high-power noise signals within the working frequency band of satellite navigation, which causes the receiver's signal-to-noise ratio to decrease, making it unable to receive GNSS satellite signals normally, thereby affecting the performance of the equipment or causing it to malfunction. In contrast, deception interference simulates satellite navigation signals to induce GNSS receivers to calculate incorrect position, time and speed information, which is more concealed, destructive and threatening. Therefore, rapid and accurate monitoring of GNSS interference in airports and surrounding areas, especially effective protection against deception interference, is an important task to ensure aviation safety and efficiency.

[0006] However, most GNSS interference monitoring devices at airports currently only monitor interference for a single satellite system (such as GPS), and it is difficult to fully cover other satellite systems (such as GLONASS, Galileo, BDS). This results in the existing monitoring system being unable to provide sufficient reliability and comprehensiveness when facing multi-mode satellite systems. In addition, when faced with complex interference types, existing interference monitoring systems mostly rely on a single detection method (such as signal strength monitoring), lack flexibility, and are difficult to adapt to complex scenarios where repressive interference and deceptive interference coexist. This limitation not only affects the accuracy of monitoring, but also increases the false alarm rate, and cannot effectively ensure aviation safety. Summary of the invention

[0007] In order to solve at least one technical problem existing in the prior art, the present application provides an airport GNSS signal interference monitoring system and a monitoring method.

[0008] In a first aspect, the present application discloses an airport GNSS signal interference monitoring system, comprising a data processing device and at least three GNSS fixed receiving stations distributed at different locations in the airport to be tested, wherein each of the GNSS fixed receiving devices comprises:

[0009] A GNSS receiving module, which is used to receive an initial GNSS signal in real time, wherein the initial GNSS signal includes a normal signal and may also include an interference signal;

[0010] A communication module, which is used to realize networking communication between each of the GNSS fixed receiving devices and the data processing device;

[0011] A radio frequency monitoring module, which is used to process the initial GNSS signal to obtain a real-time power value and phase of the initial GNSS signal;

[0012] an information processing module, which is used to parse the initial GNSS signal to obtain a parsed GNSS signal, wherein the parsed GNSS signal contains the real-time position information of the GNSS fixed receiving device, and further, the information processing module is used to send one of the parsed GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal to the data processing device through the communication module according to a control instruction;

[0013] Accordingly, the data processing device is used to send corresponding control instructions to the information processing module of each of the GNSS fixed receiving devices according to the pre-extracted signal type, and implement at least one of the following three operations according to the received signal:

[0014] Processing the received resolved GNSS signal, and judging whether there is an interference signal in the initial GNSS signal according to whether the real-time position of the corresponding GNSS fixed receiving device and the deviation of the real-time position are obtained;

[0015] Determining whether there is an interference signal in the initial GNSS signal according to the deviation of the real-time power value of the received initial GNSS signal;

[0016] Acquire the signal incident angle and signal azimuth of the initial GNSS signal according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices, so as to determine whether there is an interference signal in the initial GNSS signal;

[0017] Furthermore, the data processing device is also used for:

[0018] When it implements only one of the above operations, if it determines that there is an interference signal, it issues an interference warning message;

[0019] When it is able to implement any two or all three of the above operations, if any one of the judgment results is that an interference signal exists, an interference alarm message is issued.

[0020] Optionally, the data processing device determines whether there is an interference signal in the initial GNSS signal by the following methods:

[0021] Processing the received resolved GNSS signal, if the real-time position of the corresponding GNSS fixed receiving device is not obtained, determining that an interference signal exists in the initial GNSS signal, if the corresponding real-time position is obtained, comparing the real-time position with a pre-stored reference position, if the deviation between the two exceeds a set threshold, determining that an interference signal exists in the GNSS signal;

[0022] Comparing the received real-time power value of the initial GNSS signal with a pre-stored reference power value, and if a deviation between the two exceeds a set threshold, determining that an interference signal exists in the initial GNSS signal;

[0023] The phases of all initial GNSS signals are spatially analyzed to obtain the signal incident angle and signal azimuth of the initial GNSS signal received at any time. If it is determined that the initial GNSS signal does not come from the atmosphere, it means that there is an interference signal in the initial GNSS signal.

[0024] Optionally, for the detection method based on the GNSS signal azimuth, in addition to the above-mentioned method of using at least three GNSS fixed receiving devices, a single GNSS fixed receiving device can also be equipped with a GNSS antenna array to determine the incident angle and azimuth, which can also achieve the same effect.

[0025] Optionally, each of the GNSS fixed receiving devices further includes:

[0026] A clock module is used to synchronize the clocks of the GNSS receiving modules in each of the GNSS fixed receiving devices.

[0027] Optionally, each of the GNSS fixed receiving devices further includes:

[0028] A storage module, which can store the corresponding resolved GNSS signal, the real-time power value of the initial GNSS signal and the phase of the initial GNSS signal when the communication network between each of the GNSS fixed receiving devices and the data processing device is interrupted, and send the corresponding signal to the data processing device according to the control instruction after the communication network is restored.

[0029] Optionally, the airport GNSS signal interference monitoring system further includes:

[0030] The alarm device is used to warn the data processing device of the interference alarm information, and the alarm includes an image alarm and / or a sound alarm.

[0031] In a second aspect, the present application further discloses an airport GNSS signal interference monitoring method using the airport GNSS signal interference monitoring system described in any one of the first aspects above, comprising the following steps:

[0032] Step 1: receiving an initial GNSS signal in real time through GNSS receiving modules of at least three GNSS fixed receiving devices distributed at different locations in the airport to be tested, wherein the initial GNSS signal includes a normal signal and may also include an interference signal;

[0033] Step 2: The radio frequency monitoring module in each of the GNSS fixed receiving devices monitors the corresponding initial GNSS signal in real time to obtain the real-time power value and phase of the initial GNSS signal;

[0034] At the same time, the information processing module in each of the GNSS fixed receiving devices parses the corresponding initial GNSS signal to obtain a parsed GNSS signal, wherein the parsed GNSS signal contains the real-time position information of the GNSS fixed receiving device;

[0035] Step 3: the information processing module in each of the GNSS fixed receiving devices sends one of the resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal to the data processing device through the communication module according to the control instruction sent by the data processing device;

[0036] Step 4: The data processing device implements at least one of the following three operations according to the received signal:

[0037] Processing the received resolved GNSS signal, and judging whether there is an interference signal in the initial GNSS signal according to whether the real-time position of the corresponding GNSS fixed receiving device and the deviation of the real-time position are obtained;

[0038] Determining whether there is an interference signal in the initial GNSS signal according to the deviation of the real-time power value of the received initial GNSS signal;

[0039] Acquire the signal incident angle and signal azimuth of the initial GNSS signal according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices, so as to determine whether there is an interference signal in the initial GNSS signal;

[0040] Step 5: When the data processing device determines that there is an interference signal in the initial GNSS signal, an interference warning message is issued;

[0041] Wherein, when the data processing device implements only one operation in step 4, if it is determined that there is an interference signal, interference warning information is issued;

[0042] When it is possible to implement any two or all three operations in step 4, if any one of the judgment results is that an interference signal exists, an interference alarm message is issued.

[0043] Optionally, in step 4, the specific steps of the first operation implemented by the data processing device are as follows:

[0044] Step 4.11, obtaining the actual installation position of each of the GNSS fixed receiving devices as a reference position;

[0045] Step 4.12, processing the resolved GNSS signal received from each of the GNSS fixed receiving devices, and if the real-time position of the corresponding GNSS fixed receiving device is not obtained, determining whether the real-time position of the corresponding GNSS fixed receiving device can be obtained, and if not, determining whether there is an interference signal in the initial GNSS signal, and if it can be obtained, proceeding to step 4.13;

[0046] Step 4.13: compare the real-time position with the corresponding reference position. When the deviation between the two exceeds a set threshold, it is determined that there is an interference signal in the initial GNSS signal.

[0047] Optionally, in step 4, the specific steps of the second operation implemented by the data processing device are as follows:

[0048] Step 4.21, obtaining a reference power value of an initial GNSS signal received by a GNSS receiving module in each of the GNSS fixed receiving devices;

[0049] Step 4.22: Compare the real-time power value of the initial GNSS signal received by each of the GNSS fixed receiving devices with the pre-stored reference power value. If the deviation between the two exceeds a set threshold, it is determined that an interference signal exists in the initial GNSS signal.

[0050] Optionally, in step 4, the specific steps of the third operation implemented by the data processing device are as follows:

[0051] Step 4.31, obtaining the signal incident angle and signal azimuth of the initial GNSS signal according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices;

[0052] Step 4.32: Determine whether the initial GNSS signal comes from the atmosphere by using the signal incident angle and signal azimuth. If not, determine that there is an interference signal in the initial GNSS signal.

[0053] Optionally, in step 1, before the GNSS receiving modules of at least three GNSS fixed receiving devices receive the initial GNSS signal in real time, the following steps are also included:

[0054] Synchronize the clocks of each GNSS receiving module through the clock module;

[0055] Furthermore, between step 2 and step 3, the following steps are also included:

[0056] Determine whether the communication network between the GNSS fixed receiving device and the data processing device is normal. If the communication network is normal, continue to execute the subsequent steps; if the communication network is interrupted, store the corresponding resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal through the storage module; if the communication network is restored to normal from the interruption, then in step three, the resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal stored in the storage module need to be sent to the data processing device;

[0057] Furthermore, the airport GNSS signal interference monitoring method further includes:

[0058] Step 6: The data processing device sends out interference warning information to warn through the warning device, and the warning includes image warning and / or sound warning.

[0059] This application has at least the following beneficial technical effects:

[0060] 1) The airport GNSS signal interference monitoring system and monitoring method of the present application provide three detection methods for airport GNSS interference monitoring, which can be used individually or in combination according to actual conditions. Not only is it more flexible, it can also further improve monitoring accuracy and reduce false alarm rate;

[0061] 2) The airport GNSS signal interference monitoring system and monitoring method of the present application have a wide range of applications, not only limited to common GPS interference, but also applicable to single-mode or multi-mode satellite systems such as GLONASS, Galileo, BDS, etc.; not only applicable to deceptive interference, but also applicable to suppressive interference;

[0062] 3) This application is based on the actual problems faced by airports, and combined with the characteristics and requirements of civil aviation operations, it proposes a GNSS signal interference monitoring system and monitoring method for airports, which can continuously monitor whether there is GNSS interference at the airport and issue an alarm, so that the relevant airport management departments can discover and take measures in time, and effectively improve the level of airport safety operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is the architecture diagram of the airport GNSS signal interference monitoring system of the present application;

[0064] Figure 2 It is a module structure diagram of the GNSS fixed receiving device in the airport GNSS signal interference monitoring system of the present application;

[0065] Figure 3 It is a flowchart of the steps of the first operation implemented by the data processing device in the airport GNSS signal interference monitoring system and monitoring method of the present application;

[0066] Figure 4 It is a flowchart of the steps of the second operation implemented by the data processing device in the airport GNSS signal interference monitoring system and monitoring method of the present application;

[0067] Figure 5 It is a flow chart of the steps of the third operation implemented by the data processing device in the airport GNSS signal interference monitoring system and monitoring method of the present application. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0069] The present application proposes to install at least three GNSS fixed receiving devices 2 (i.e., GNSS fixed receiving stations) at the airport, and the receiving station installation locations are as evenly distributed as possible at the airport or near important equipment and facilities. The data of the receiving station is transmitted to the data processing device 1 (i.e., data processing center) in real time through network networking. By analyzing and comparing the data of the data processing center, according to the three detection methods proposed in the present application, the presence of GNSS interference is identified from multiple dimensions, namely, based on the offset of the GNSS fixed receiving station position, based on the detection of GNSS signal power intensity, and based on the detection of GNSS signal orientation.

[0070] First, as Figure 1-Figure 2 As shown, the present application discloses an airport GNSS signal interference monitoring system, comprising a data processing device 1 and at least three GNSS fixed receiving stations 2 distributed at different locations in the airport to be tested.

[0071] Each GNSS fixed receiving device 2 may include a GNSS receiving module 21 , a communication module 22 , a radio frequency monitoring module 23 and an information processing module 24 .

[0072] Specifically, the GNSS receiving module 21 is used to receive the initial GNSS signal in real time, wherein the initial GNSS signal includes a normal signal from a GNSS satellite constellation and may also include an interference signal from a GNSS interference source. It should be noted that the interference signal here is not limited to common GPS interference, but also applies to single-mode or multi-mode satellite systems such as GLONASS, Galileo, and BDS; it is not only applicable to deceptive interference, but also to suppressive interference.

[0073] The communication module 22 is used to cooperate with a corresponding gateway to achieve networking communication between each GNSS fixed receiving device 2 and the data processing device 1 .

[0074] The radio frequency monitoring module 23 is used to process the initial GNSS signal to obtain the real-time power value and phase of the initial GNSS signal.

[0075] The information processing module 24 may be an information processing device such as a microcontroller or a single-chip microcomputer, which is used to parse the initial GNSS signal to obtain a parsed GNSS signal, which contains the real-time location information of the GNSS fixed receiving device 2. It should be noted that the initial GNSS signal initially received contains a lot of information, and the purpose of processing by the information processing module 24 is to remove the redundant information and retain the real-time location information.

[0076] In addition, the information processing module 24 is also used to send (feed back to) the data processing device 1 through the communication module 22 one of the above-obtained resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal according to the control instruction (the control instruction may come from the data processing device 1, and the control instruction may be a control instruction generated by manual operation, or a control instruction automatically generated by the data processing device 1).

[0077] Accordingly, the data processing device 1 is used to send a corresponding control instruction to the information processing module 24 of each GNSS fixed receiving device 2 according to the pre-extracted signal type (i.e., one of the above three signals / data), and implement at least one of the following three operations according to the received signal sent by the corresponding information processing module 24:

[0078] The first operation: reference Figure 3 As shown, the data processing device 1 processes the received resolved GNSS signal and determines whether there is an interference signal in the initial GNSS signal according to whether the real-time position of the corresponding GNSS fixed receiving device (2) is obtained and the deviation of the real-time position.

[0079] Specifically, if the real-time position of the corresponding GNSS fixed receiving device 2 is not obtained after processing, it is judged that there is an interference signal in the initial GNSS signal. If the corresponding real-time position is obtained, the real-time position is compared with the pre-stored reference position. If the deviation between the two exceeds the set threshold (which can be appropriately set according to actual needs), it is judged that there is an interference signal in the initial GNSS signal. If the deviation between the two does not exceed the set threshold, it means that there is no interference signal in the initial GNSS signal.

[0080] The second operation: reference Figure 4 As shown, the data processing device 1 determines whether there is an interference signal in the initial GNSS signal according to the deviation of the real-time power value of the received initial GNSS signal.

[0081] Specifically, the real-time power value of the received initial GNSS signal is compared with the pre-stored reference power value. If the deviation between the two exceeds a set threshold (which can be appropriately set according to actual needs), it is determined that there is an interference signal in the initial GNSS signal. If the deviation between the two does not exceed the set threshold, it means that there is no interference signal in the initial GNSS signal.

[0082] The third operation: reference Figure 5 As shown, the data processing device 1 obtains the signal incident angle and signal azimuth of the initial GNSS signal according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices 2, so as to determine whether there is an interference signal in the initial GNSS signal.

[0083] Specifically, the phases of all initial GNSS signals are spatially analyzed to obtain the signal incident angle and signal azimuth of the initial GNSS signal received at any moment. If it is determined that the initial GNSS signal does not come from the atmosphere, it means that there is an interference signal in the initial GNSS signal; otherwise, it means that there is no interference signal in the initial GNSS signal.

[0084] Furthermore, since the above three operations may be implemented by only one of them, any two of them, or all three of them, it is necessary to make a comprehensive judgment on the results obtained when implementing two or more operations. Therefore, the data processing device 1 is also used for:

[0085] When it implements only one of the above operations (ie, any one of the three), if it is determined that there is an interference signal, an interference alarm message is issued.

[0086] When it is able to implement any two or all three of the above operations, if any one of the judgment results is that an interference signal exists (that is, as long as the judgment result of one of the operations is that an interference signal exists), interference warning information is issued.

[0087] In addition, it should be noted that for the detection method based on the GNSS signal azimuth, in addition to the above-mentioned method of using at least three GNSS fixed receiving devices, a single GNSS fixed receiving device can also be equipped with a GNSS antenna array to determine the incident angle and azimuth, which can also achieve the same effect.

[0088] Furthermore, in the airport GNSS signal interference monitoring system of the present application, each GNSS fixed receiving device 2 may also include a clock module 25 and a storage module 26 .

[0089] The clock module 25 is used to synchronize the clocks of the GNSS receiving modules 21 in each GNSS fixed receiving device 2, so as to facilitate the subsequent calculation of the RF signal orientation.

[0090] The storage module 26 can store the corresponding resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal when the communication network between each GNSS fixed receiving device 2 and the data processing device 1 is interrupted, and send the corresponding signal to the data processing device 1 according to the control instruction after the communication network is restored.

[0091] Furthermore, the airport GNSS signal interference monitoring system of the present application may also include an alarm device 3, which may be, for example, a display screen, an audible and visual alarm, etc., and is used to issue an interference alarm message to the data processing device 1 for alarm, and the alarm includes an image alarm and / or a sound alarm.

[0092] In a second aspect, the present application further discloses an airport GNSS signal interference monitoring method using the airport GNSS signal interference monitoring system described in any one of the first aspects above, the method comprising the following steps:

[0093] Step 1: Receive initial GNSS signals in real time through GNSS receiving modules 21 of at least three GNSS fixed receiving devices 2 distributed at different locations in the airport to be tested, wherein the initial GNSS signals include normal signals and may also include interference signals.

[0094] Step 2: The radio frequency monitoring module 23 in each GNSS fixed receiving device 2 monitors the corresponding initial GNSS signal in real time to obtain the real-time power value and phase of the initial GNSS signal.

[0095] At the same time, the information processing module 24 in each GNSS fixed receiving device 2 analyzes the corresponding initial GNSS signal to obtain an analyzed GNSS signal, which contains the real-time position information of the GNSS fixed receiving device 2 .

[0096] Step 3: The information processing module 24 in each GNSS fixed receiving device 2 sends one of the resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal to the data processing device 1 through the communication module 22 according to the control instruction sent by the data processing device 1.

[0097] Step 4: The data processing device 1 implements at least one of the following three operations according to the received signal.

[0098] It should be noted that when the GNSS fixed receiving device 2 (i.e., the GNSS fixed receiving station) is installed, we can easily obtain the accurate location of each GNSS fixed receiving device 2 installation point and use it as the benchmark reference point of the GNSS fixed receiving device 2. The GNSS fixed receiving device 2 will parse the received GNSS real-time signal (i.e., the initial GNSS signal) and send it to the data processing device 1. Under normal circumstances, the real-time position of the GNSS fixed receiving device 2 received by the data processing device 1 should be near the benchmark reference point. If the deviation exceeds the set threshold range or the real-time position is lost, it may mean that the GNSS fixed receiving device 2 is interfered with by the signal.

[0099] Therefore, the first operation implemented by the data processing device 1 is:

[0100] The data processing device 1 processes the received resolved GNSS signal, and determines whether there is an interference signal in the initial GNSS signal according to whether the real-time position of the corresponding GNSS fixed receiving device 2 and the deviation of the real-time position are obtained.

[0101] More specifically, referring to FIG. 3 , the specific steps of the data processing device 1 to implement the first operation are as follows:

[0102] Step 4.11, obtaining the actual installation position (i.e., the accurate position in the figure) of each GNSS fixed receiving device 2 as the reference position (i.e., the reference reference point in the figure);

[0103] Step 4.12, processing the resolved GNSS signal received from each GNSS fixed receiving device 2, and determining whether the real-time position of the corresponding GNSS fixed receiving device 2 can be obtained. If not, determining whether there is an interference signal in the initial GNSS signal. If it can be obtained, proceeding to step 4.13;

[0104] Step 4.13: compare the real-time position with the corresponding reference position. When the deviation between the two exceeds the set threshold, it is determined that there is an interference signal in the initial GNSS signal. If the deviation between the two does not exceed the set threshold, it means that there is no interference signal in the initial GNSS signal.

[0105] It should also be noted that if it is necessary to interfere with the airport and surrounding GNSS receivers, it is necessary to inject a more powerful GNSS signal. Therefore, the power strength of the GNSS signal received by the GNSS fixed receiving device 2 can be monitored in real time. If the GNSS signal power continues to become significantly stronger, it may indicate that there is interference near the GNSS fixed receiving device 2.

[0106] Therefore, the second operation implemented by the data processing device 1 is:

[0107] The data processing device 1 determines whether there is an interference signal in the initial GNSS signal according to the deviation of the real-time power value of the received initial GNSS signal.

[0108] More specifically, referring to FIG. 4 , the specific steps of the data processing device 1 to implement the second operation are as follows:

[0109] Step 4.21, obtaining a reference power value of the initial GNSS signal received by the GNSS receiving module 21 in each GNSS fixed receiving device 2;

[0110] Step 4.22: Compare the real-time power value of the initial GNSS signal received by each GNSS fixed receiving device 2 with the pre-stored reference power value. If the deviation between the two exceeds the set threshold, it is determined that there is an interference signal in the initial GNSS signal. If the deviation between the two does not exceed the set threshold, it means that there is no interference signal in the initial GNSS signal.

[0111] Furthermore, the third operation implemented by the data processing device 1 is:

[0112] The signal incident angle and signal azimuth of the initial GNSS signal are acquired according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices 2, so as to determine whether there is an interference signal in the initial GNSS signal.

[0113] More specifically, referring to FIG. 5 , the specific steps of the data processing device 1 to implement the third operation are as follows:

[0114] Step 4.31, performing spatial analysis according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices 2, so as to obtain the signal incident angle and signal azimuth of the initial GNSS signal;

[0115] Step 4.32: Determine whether the initial GNSS signal comes from the atmosphere by using the signal incident angle and signal azimuth. If not, it is determined that there is an interference signal in the initial GNSS signal. Otherwise, it means that there is no interference signal in the initial GNSS signal.

[0116] Step 5: When the data processing device 1 determines that there is an interference signal in the initial GNSS signal, an interference warning message is issued;

[0117] Wherein, when the data processing device 1 implements only one operation in the step 4, if it is determined that there is an interference signal, an interference alarm message is issued;

[0118] When it is able to implement any two or all three operations in step 4, if any one of the judgment results is that an interference signal exists, an interference alarm message is issued.

[0119] Furthermore, in step 1 of the airport GNSS signal interference monitoring method of the present application, before the GNSS receiving modules 21 of at least three GNSS fixed receiving devices 2 receive the initial GNSS signal in real time, the following steps are also included:

[0120] The clocks of the GNSS receiving modules 21 are synchronized by the clock module 25 .

[0121] Furthermore, between step 2 and step 3, the following steps are also included:

[0122] Determine whether the communication network between the GNSS fixed receiving device 2 and the data processing device 1 is normal. If the communication network is normal, continue to execute subsequent steps;

[0123] If the communication network is interrupted, the corresponding resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal are stored through the storage module 26;

[0124] If the communication network is restored to normal after being interrupted, then in step three, the resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal stored in the storage module 26 also need to be sent to the data processing device 1 .

[0125] Furthermore, the airport GNSS signal interference monitoring method of the present application also includes:

[0126] Step six: the data processing device 1 sends out interference warning information to warn through the warning device 3, and the warning includes image warning and / or sound warning.

[0127] In summary, the airport GNSS signal interference monitoring system and monitoring method of the present application provide three detection methods for airport GNSS interference monitoring, which can be used individually or in combination according to actual conditions. It is not only more flexible, but also can further improve monitoring accuracy and reduce false alarm rate.

[0128] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An airport GNSS signal interference monitoring system, characterized in that: The invention comprises a data processing device (1) and at least three GNSS fixed receiving stations (2) distributed at different locations in an airport to be tested, wherein each of the GNSS fixed receiving devices (2) comprises: A GNSS receiving module (21), which is used to receive an initial GNSS signal in real time, wherein the initial GNSS signal includes a normal signal and may also include an interference signal; A communication module (22) used to realize networking communication between each of the GNSS fixed receiving devices (2) and the data processing device (1); A radio frequency monitoring module (23), which is used to process the initial GNSS signal to obtain a real-time power value and phase of the initial GNSS signal; an information processing module (24) for parsing the initial GNSS signal to obtain a parsed GNSS signal, wherein the parsed GNSS signal contains real-time position information of the GNSS fixed receiving device (2); in addition, the information processing module (24) is further used to send one of the parsed GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal to the data processing device (1) through the communication module (22) according to a control instruction; Accordingly, the data processing device (1) is used to send a corresponding control instruction to the information processing module (24) of each of the GNSS fixed receiving devices (2) according to the pre-extracted signal type, and implement at least one of the following three operations according to the received signal: Processing the received resolved GNSS signal, and judging whether there is an interference signal in the initial GNSS signal according to whether the real-time position of the corresponding GNSS fixed receiving device (2) is obtained and the deviation of the real-time position; Determining whether there is an interference signal in the initial GNSS signal according to the deviation of the real-time power value of the received initial GNSS signal; Acquiring the signal incident angle and signal azimuth of the initial GNSS signal according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices (2), thereby determining whether there is an interference signal in the initial GNSS signal; Furthermore, the data processing device (1) is also used for: When it implements only one of the above operations, if it determines that there is an interference signal, it issues an interference warning message; When it is able to implement any two or all three of the above operations, if any one of the judgment results is that an interference signal exists, an interference alarm message is issued.

2. The airport GNSS signal interference monitoring system according to claim 1, characterized in that: The data processing device (1) determines whether there is an interference signal in the initial GNSS signal by the following methods: Processing the received resolved GNSS signal, if the real-time position of the corresponding GNSS fixed receiving device (2) is not obtained, determining that an interference signal exists in the initial GNSS signal, if the corresponding real-time position is obtained, comparing the real-time position with a pre-stored reference position, if the deviation between the two exceeds a set threshold, determining that an interference signal exists in the initial GNSS signal; Comparing the received real-time power value of the initial GNSS signal with a pre-stored reference power value, and if a deviation between the two exceeds a set threshold, determining that an interference signal exists in the initial GNSS signal; The phases of all initial GNSS signals are spatially analyzed to obtain the signal incident angle and signal azimuth of the initial GNSS signal received at any time. If it is determined that the initial GNSS signal does not come from the atmosphere, it means that there is an interference signal in the initial GNSS signal.

3. The airport GNSS signal interference monitoring system according to claim 1, characterized in that: Each of the GNSS fixed receiving devices (2) further comprises: A clock module (25) is used to synchronize the clocks of the GNSS receiving modules (21) in each of the GNSS fixed receiving devices (2).

4. The airport GNSS signal interference monitoring system according to claim 1, characterized in that: Each of the GNSS fixed receiving devices (2) further comprises: A storage module (26) is capable of storing the corresponding resolved GNSS signal, the real-time power value of the initial GNSS signal and the phase of the initial GNSS signal when the communication network between each of the GNSS fixed receiving devices (2) and the data processing device (1) is interrupted, and sending the corresponding signal to the data processing device (1) according to the control instruction after the communication network is restored.

5. The airport GNSS signal interference monitoring system according to claim 1, characterized in that: Also includes: An alarm device (3) is used to issue an interference alarm message to the data processing device (1), wherein the alarm includes an image alarm and / or an audio alarm.

6. A method for monitoring airport GNSS signal interference using the airport GNSS signal interference monitoring system according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: receiving an initial GNSS signal in real time through GNSS receiving modules (21) of at least three GNSS fixed receiving devices (2) distributed at different locations in the airport to be tested, wherein the initial GNSS signal includes a normal signal and may also include an interference signal; Step 2: The radio frequency monitoring module (23) in each of the GNSS fixed receiving devices (2) monitors the corresponding initial GNSS signal in real time to obtain the real-time power value and phase of the initial GNSS signal; At the same time, the information processing module (24) in each of the GNSS fixed receiving devices (2) parses the corresponding initial GNSS signal to obtain a parsed GNSS signal, wherein the parsed GNSS signal contains the real-time position information of the GNSS fixed receiving device (2); Step 3: the information processing module (24) in each of the GNSS fixed receiving devices (2) sends one of the resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal to the data processing device (1) through the communication module (22) according to the control instruction sent by the data processing device (1); Step 4: The data processing device (1) performs at least one of the following three operations according to the received signal: Processing the received resolved GNSS signal, and judging whether there is an interference signal in the initial GNSS signal according to whether the real-time position of the corresponding GNSS fixed receiving device (2) is obtained and the deviation of the real-time position; Determining whether there is an interference signal in the initial GNSS signal according to the deviation of the real-time power value of the received initial GNSS signal; Acquiring the signal incident angle and signal azimuth of the initial GNSS signal according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices (2), thereby determining whether there is an interference signal in the initial GNSS signal; Step 5: When the data processing device (1) determines that there is an interference signal in the initial GNSS signal, it issues an interference warning message; Wherein, when the data processing device (1) implements only one operation in step 4, if it is determined that an interference signal exists, interference warning information is issued; When it is possible to implement any two or all three operations in step 4, if any one of the judgment results is that an interference signal exists, an interference alarm message is issued.

7. The airport GNSS signal interference monitoring method according to claim 6, characterized in that: In step 4, the specific steps of the first operation implemented by the data processing device (1) are as follows: Step 4.11, obtaining the actual installation position of each of the GNSS fixed receiving devices (2) as a reference position; Step 4.12, processing the resolved GNSS signal received from each of the GNSS fixed receiving devices (2), and determining whether the real-time position of the corresponding GNSS fixed receiving device (2) can be obtained. If not, determining whether there is an interference signal in the initial GNSS signal. If it can be obtained, proceeding to step 4.13; Step 4.13: compare the real-time position with the corresponding reference position. When the deviation between the two exceeds a set threshold, it is determined that there is an interference signal in the initial GNSS signal.

8. The airport GNSS signal interference monitoring method according to claim 6, characterized in that: In step 4, the specific steps of the second operation implemented by the data processing device (1) are as follows: Step 4.21, obtaining a reference power value of an initial GNSS signal received by the GNSS receiving module (21) in each of the GNSS fixed receiving devices (2); Step 4.22: compare the real-time power value of the initial GNSS signal received by each of the GNSS fixed receiving devices (2) with the pre-stored reference power value. If the deviation between the two exceeds a set threshold, it is determined that an interference signal exists in the initial GNSS signal.

9. The airport GNSS signal interference monitoring method according to claim 6, characterized in that: In step 4, the specific steps of the third operation implemented by the data processing device (1) are as follows: Step 4.31, obtaining the signal incident angle and signal azimuth of the initial GNSS signal according to the phases of the initial GNSS signals received from all the GNSS fixed receiving devices (2); Step 4.32: Determine whether the initial GNSS signal comes from the atmosphere by using the signal incident angle and signal azimuth. If not, determine that there is an interference signal in the initial GNSS signal.

10. The airport GNSS signal interference monitoring method according to claim 6, characterized in that: In the step 1, before the GNSS receiving modules (21) of at least three GNSS fixed receiving devices (2) receive the initial GNSS signal in real time, the following steps are also included: Synchronizing the clocks of the GNSS receiving modules (21) through a clock module (25); Furthermore, between step 2 and step 3, the following steps are also included: Determine whether the communication network between the GNSS fixed receiving device (2) and the data processing device (1) is normal. If the communication network is normal, continue to execute the subsequent steps; if the communication network is interrupted, store the corresponding resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal through the storage module (26); if the communication network is restored to normal from the interruption, then in step three, the resolved GNSS signal, the real-time power value of the initial GNSS signal, and the phase of the initial GNSS signal stored in the storage module (26) need to be sent to the data processing device (1); Furthermore, the airport GNSS signal interference monitoring method further includes: Step six: the data processing device (1) is warned by the warning device (3) by sending interference warning information, wherein the warning includes an image warning and / or a sound warning.

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