Distributed GNSS (Global Navigation Satellite System) time service hidden deception equipment and method

Abstract

The invention discloses a distributed GNSS (Global Navigation Satellite System) time service hidden deception device and a control method thereof, and the device comprises a target detection device which is used for sending target position information to a main control device; the main control equipment is used for receiving the target position information, determining a deception strategy and obtaining time synchronization and communication signals; the distributed signal generation equipment is used for receiving the time synchronization and communication signal, the target position information and the real GNSS signal, measuring the time difference between the local atomic clock and the main control equipment atomic clock, obtaining the time difference and a parameter instruction, obtaining a deception signal according to the time difference, the parameter instruction and the navigation positioning information, and obtaining a deception signal according to the target position information; a signal emission module control instruction is obtained; and the signal transmitting module is used for receiving the control instruction of the signal transmitting module and the deception signal and transmitting the deception signal through a servo antenna. According to the distributed GNSS time service hidden deception equipment and the control method thereof, the code phase of the signal is synchronously changed when the deception signal is generated, so that hidden cut-in deception is realized.

Description

Technical Field

[0001] The present invention relates to the technical fields of time deception, satellite navigation, time synchronization and electronic countermeasures, and in particular to a distributed GNSS timing concealed deception device and a control method thereof. Background Art

[0002] With the widespread application of satellite navigation systems (GNSS), more and more systems and equipment use GNSS receivers as the main means of timing. Therefore, in the field of electronic countermeasures, deception and interference of the timing function of satellite navigation receivers has also become an important topic. For system equipment such as drone swarms, power distribution networks, and distributed radars, if their timing time bases can be effectively deceiving and interfering, their working efficiency can be effectively interfered. However, with the development of receiver anti-deception and interference technology, the deception interference of the target time base needs to be highly concealed. The deception interference methods for navigation receivers are mainly divided into forwarding interference and generating interference. Although forwarding interference can forward the real navigation signal and delay it, it can only perform asynchronous deception and cannot achieve synchronous deception. It requires advanced power suppression and then deception interference. In the suppression stage, the abnormality of the receiver power will be easily detected, making it difficult to achieve concealed deception. Summary of the invention

[0003] The present invention proposes a distributed GNSS timing covert deception device and a control method thereof, so as to solve the problem that the existing deception interference method is difficult to achieve covert entry deception.

[0004] The present invention provides the following technical solutions:

[0005] In a first aspect, the present specification provides a distributed GNSS timing covert deception device, including a target detection device, a main control device, a plurality of distributed signal generating devices, a plurality of signal transmitting modules and a plurality of servo antennas, wherein the target detection device is communicatively connected to the main control device, the main control device is communicatively connected to each distributed signal generating device, each distributed signal generating device is connected to a corresponding signal transmitting module, and each signal transmitting module is communicatively connected to a corresponding servo antenna, wherein:

[0006] The target detection device is used to send target location information to the main control device;

[0007] The master control device is used to receive the target location information, determine the deception strategy according to the power of the real GNSS signal and the target location information, obtain the time synchronization and communication signal, and send the target location information and the time synchronization and communication signal to the distributed signal generation device;

[0008] The distributed signal generating device is used to receive the time synchronization and communication signal, the target location information and the real GNSS signal, measure the time difference between the local atomic clock and the atomic clock of the master control device, obtain the time difference and parameter instructions, obtain the spoofing signal according to the time difference and parameter instructions and the navigation positioning information, obtain the signal transmission module control instruction according to the target location information, and send the spoofing signal and the signal transmission module control instruction to the signal transmission module;

[0009] The signal transmitting module is used to receive the signal transmitting module control instruction and the spoofing signal, and transmit the spoofing signal through the servo antenna.

[0010] In a second aspect, the present invention provides a method for controlling a distributed GNSS timing covert deception device, comprising:

[0011] The target detection device sends target location information to the main control device;

[0012] The master control device receives the target location information, determines a deception strategy according to the power of the real GNSS signal and the target location information, obtains time synchronization and communication signals, and sends the target location information and the time synchronization and communication signals to the distributed signal generating device;

[0013] The distributed signal generating device receives the time synchronization and communication signal, the target location information and the real GNSS signal, measures the time difference between the local atomic clock and the atomic clock of the master control device, obtains the time difference and parameter instruction, obtains the spoofing signal according to the time difference and parameter instruction and the navigation positioning information, obtains the signal transmission module control instruction according to the target location information, and sends the spoofing signal and the signal transmission module control instruction to the signal transmission module;

[0014] The signal transmitting module receives the signal transmitting module control instruction and the spoofing signal, and transmits the spoofing signal through the servo antenna.

[0015] The distributed GNSS timing covert deception device and control method thereof provided in the embodiment of the present invention use a generative deception method. At the same time, according to the four-sphere positioning principle, the code phase of the signal is synchronously changed when the deception signal is generated, so as to achieve covert deception of stationary targets, thereby solving the problem that the existing deception interference methods are difficult to achieve covert entry deception. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system overall block diagram of a distributed GNSS timing covert deception device in an embodiment of the present invention;

[0017] Figure 2A schematic diagram of a distributed signal generating device for each node in an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of a main control device in an embodiment of the present invention;

[0019] Figure 4 This is a working flow chart of the distributed GNSS timing covert deception device in an embodiment of the present invention.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this specification more clear, the technical solutions of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of them. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0022] As described herein, the term “including” and various variations thereof may be understood as open-ended terms meaning “including but not limited to,” and the term “one embodiment” may be understood as “at least one embodiment.”

[0023] The inventors have discovered that existing deception jammers are unable to achieve covert cut-in deception, which results in receiver power anomalies that are easily detected during the suppression phase. In recent years, anti-deception technologies such as array anti-interference antennas, detection based on the direction of incoming signals, and detection of angle of arrival of signals have been widely used. In view of this, in order to achieve covert deception of the receiver, it is not possible to use only a single incoming deception signal. A distributed deception jammer system that can synchronously transmit deception signals is required. In an embodiment of the present invention, a generative deception method is adopted, and according to the four-sphere positioning principle, the code phase of the signal is synchronously changed when the deception signal is generated to achieve covert deception of stationary targets.

[0024] Embodiment 1

[0025] Figure 1The overall system block diagram of a distributed GNSS timing covert deception device of an embodiment of the present application is schematically shown, including a target detection device, a main control device, multiple distributed signal generating devices, multiple signal transmitting modules and multiple servo antennas, wherein the target detection device is communicatively connected to the main control device, the main control device is communicatively connected to each distributed signal generating device, each distributed signal generating device is connected to a corresponding signal transmitting module, and each signal transmitting module is communicatively connected to a corresponding servo antenna, wherein:

[0026] The target detection device is used to send target location information to the main control device;

[0027] The master control device is used to receive the target location information, determine the deception strategy according to the power of the real GNSS signal and the target location information, obtain the time synchronization and communication signal, and send the target location information and the time synchronization and communication signal to the distributed signal generation device;

[0028] The distributed signal generating device is used to receive the time synchronization and communication signal, the target location information and the real GNSS signal, measure the time difference between the local atomic clock and the atomic clock of the master control device, obtain the time difference and parameter instructions, obtain the spoofing signal according to the time difference and parameter instructions and the navigation positioning information, obtain the signal transmission module control instruction according to the target location information, and send the spoofing signal and the signal transmission module control instruction to the signal transmission module;

[0029] The signal transmitting module is used to receive the signal transmitting module control instruction and the spoofing signal, and transmit the spoofing signal through the servo antenna.

[0030] In one embodiment, the distributed signal generation device includes a time synchronization and communication module, a baseband signal generation module, a radio frequency module, a satellite receiver and an atomic clock, wherein the time synchronization and communication module is communicatively connected to the baseband signal generation module, and the baseband signal generation module is communicatively connected to the radio frequency module, the satellite receiver and the atomic clock respectively, wherein:

[0031] The time synchronization and communication module is used to receive the time synchronization and communication signal, measure the time difference between the local atomic clock and the atomic clock of the master control device, obtain the time difference and parameter instructions, and send the time difference and parameter instructions to the baseband signal generation module;

[0032] The satellite receiver is used to receive real GNSS signals, obtain navigation and positioning information according to the real GNSS signals, and send the navigation and positioning information to the baseband signal generation module;

[0033] The baseband signal generating module is used to receive the target position information, the time difference and parameter instruction and the navigation positioning information, determine the transmission signal power and the servo antenna angle according to the target position information, obtain the signal transmission module control instruction, calibrate the local time according to the time difference and parameter instruction, obtain the time deception baseband signal according to the time difference and parameter instruction and the navigation positioning information, send the signal transmission module control instruction to the signal transmission module, and send the time deception baseband signal to the radio frequency module;

[0034] The radio frequency module is used to receive the time spoofing baseband signal, perform frequency conversion on the time spoofing baseband signal to obtain a spoofing signal, and send the spoofing signal to the signal transmitting module;

[0035] The atomic clock is used to provide an external time base and an external frequency standard for the baseband signal generation module.

[0036] During specific implementation, the transmit signal power is calculated according to the following formula:

[0037] P ei =P Li +P i +P c (1)

[0038] P Li =32.5+20lg(f i )+20lg(L i ) (2)

[0039]

[0040] Among them, P ei is the transmission signal power, that is, the distributed signal generating device of the i-th node needs to control the transmission signal power of the servo antenna, P Li is the signal attenuation from the i-th node to the target, P i is the power of the real GNSS signal received by the satellite receiver of the ith node, f i is the frequency of the deceptive signal of the i-th node, L i is the spatial distance between the ith node and the target, (x i ,y i ,z i ) is the coordinate of the distributed signal generating device of the ith node, (x T ,y T ,z T ) is the target coordinate, (θ h ,θ p, L) are the horizontal angle, pitch angle and distance between the target and the main control device measured by the target detection device, and (x, y, z) are the latitude and longitude of the main control device position measured by the satellite receiver of the main control device.

[0041] During specific implementation, the servo antenna angle is calculated according to the following formula:

[0042]

[0043]

[0044] Among them, θ hi ,θ pi is the servo antenna angle, θ hi The distributed signal generating device of the i-th node needs to control the horizontal angle of the servo antenna to aim at the target, θ pi The distributed signal generating device of the i-th node needs to control the pitch angle of the servo antenna to aim at the target, (x i ,y i ,z i ) is the coordinate of the distributed signal generating device of the i-th node, (θ h ,θ p , L) is the horizontal angle, pitch angle and distance of the target from the main control device measured by the target detection device, (x T ,y T ,z T ) is the target coordinate, (x, y, z) is the latitude and longitude of the main control device position measured by the satellite receiver of the main control device.

[0045] In one implementation, the master control device includes an industrial computer, a master control device time synchronization and communication module, a master control device satellite receiver, and a master control device atomic clock, and the industrial computer is respectively connected to the master control device time synchronization and communication module, the master control device satellite receiver, and the master control device atomic clock, wherein:

[0046] The industrial computer is used to receive the target location information, determine the deception strategy according to the power of the real GNSS signal and the target location information, obtain the strategy parameters and strategy instructions, and send the target location information and the strategy parameters and strategy instructions to the time synchronization and communication module of the main control device;

[0047] The master control device time synchronization and communication module is used to receive the target location information and the strategy parameters and strategy instructions, obtain time synchronization and communication signals according to the strategy parameters and strategy instructions, and send the target location information and the time synchronization and communication signals to each distributed signal generating device;

[0048] The satellite receiver of the master control device is used to receive real GNSS signals, obtain navigation and positioning information according to the real GNSS signals, and send the navigation and positioning information to the industrial computer;

[0049] The master control device atomic clock is used to provide an external time base and an external frequency standard for the industrial computer.

[0050] In specific implementation, the time difference between the local atomic clock and the atomic clock of the master control device is calculated according to the following formula:

[0051]

[0052] Among them, ΔT is the time difference between the local atomic clock and the atomic clock of the main control device, that is, the time difference between the distributed signal generating device of the i-th node and the main control device, ρ1 is the pseudorange between the distributed signal generating device of the i-th node and the main control device, ρ2 is the pseudorange of the time synchronization and communication signals received by the distributed signal generating device of the i-th node, and C is the speed of light.

[0053] The above-mentioned embodiment constructs a distributed GNSS timing covert deception device, which uses a generative deception method and, based on the four-sphere positioning principle, synchronously changes the code phase of the signal when generating the deception signal, thereby achieving covert deception of stationary targets, thereby solving the problem that existing deception interference methods are difficult to achieve covert entry deception.

[0054] Embodiment 2

[0055] Figure 1 The overall system block diagram of the distributed GNSS timing covert deception device of one embodiment of the present application is schematically shown. The system is mainly composed of a target detection device, a main control device, and a signal generation device, a signal transmission module and a servo antenna corresponding to each distributed node. The target detection device is mainly composed of a detection radar, and the signal transmission module is composed of a power amplifier. In actual use, each distributed signal generation device is deployed in different positions to perform multi-directional interference deception on the target.

[0056] When implementing it, Figure 2The figure shows the distributed signal generation device of each node. Among them, the time synchronization and communication module is responsible for communicating with the main control device and measuring the time difference between the local atomic clock and the atomic clock of the main control device. The atomic clock is responsible for providing a stable external time base and external frequency standard for the system. The baseband signal generation module will generate the corresponding time deception baseband signal according to the parameter instructions issued by the main control module and the current real ephemeris, pseudorange, time and other data received. The baseband signal is converted by the RF module to generate a deception signal, which is sent out after passing through the power amplifier and servo antenna to deceive and interfere with the target. In addition, the baseband signal generation module also calibrates the local time according to the time base difference measured by the time synchronization and communication module to achieve time synchronization between different nodes. The baseband signal generation module will also control the signal transmission module to change the power of the transmission signal and the angle of the servo antenna according to the target position information and deception strategy issued by the main control device, so as to achieve directional and covert deception of the target.

[0057] When implementing it, Figure 3 As shown in the figure, the main control device is mainly used to control each transmitting node to use a unified strategy to deceive and interfere with the target. Its core is an industrial computer, which can formulate deception strategies according to the target position information and motion status obtained by the receiving target detection device and the power of the real satellite signal received by the receiver. The generated strategy parameters and instructions are sent to the signal generation device of each node through the time synchronization and communication module. The external synchronization and communication module of this main control device also needs to be synchronized with the signal generation device of each node.

[0058] Specifically, the workflow of this system is as follows: Figure 4 shown.

[0059] In one embodiment, distributed deception is performed according to the following steps: the real satellite navigation signals come from different satellites, so the signals emitted by each satellite are different for the target. In order to bypass the anti-interference mechanism of the receiver to implement concealed time deception, it is necessary to transmit deception signals from different satellites to the target from different directions to counter anti-deception technologies such as signal arrival angle detection. Therefore, this design adopts a distributed method to deploy signal generation device nodes at different locations, and each device only generates and sends deception signals from a single satellite. For example, at this time, the real signals received by the satellite receiver of the main control device come from GPS PRN numbers 1, 3, 7, 9, 10, 11, and 16 satellites, then the main control device will control the signal generation devices 1, 2, 3, 4, 5, and 6 to simulate the navigation signals from these satellites respectively, and send them to the target to simulate the real signals from different directions.

[0060] In one embodiment, directional deception is performed according to the following steps: In order to make the power of the deception signal more concentrated to achieve a longer deception range. This design is implemented by servo-controlling the directional antenna to aim at the target. Since a distributed signal generation method is adopted, the distance between each node is far, so the main control device is required to calculate according to the target position measured by the target detection device, and finally obtain the servo antenna control parameters (horizontal and pitch angles) of each distributed node, and send them to each node so that its antenna is aimed at the same target from different directions. The calculation formula is as follows.

[0061] Assume that the latitude and longitude of the main control device measured by the satellite receiver of the main control device are (x, y, z), and the horizontal angle, pitch angle, and distance of the target from the main control device measured by the target detection device are (θ h ,θ p ,L). Then the coordinates of the target (x T ,y T ,z T )for

[0062]

[0063] Assume that the coordinates of the distributed signal generating device of the i-th node are (x i ,y i ,z i ). Then the node device needs to control the parameter of the servo antenna to aim at the target, that is, the horizontal angle θ hi , pitch angle θ pi , respectively

[0064]

[0065] The parameter horizontal angle θ in the above formula is hi , pitch angle θ pi , the latitude and longitude of the main control device (x, y, z), the target parameters (θ h ,θ p ,L), the position coordinates of the i-th node (x i ,y i ,z i ) is calculated. These parameters can be measured by the receiver and target detection radar of each device respectively. The coordinates of the master device (x, y, z) and the coordinates of the node device (x i ,y i ,z i ) is fixed when the device is in use, so the node controls the antenna control parameter horizontal angle θ hi , pitch angle θ pi , the main control device according to the radar target parameters (θ h ,θ p,L), is calculated in real time and sent to each node device in real time through the time synchronization and communication module.

[0066] In one implementation, synchronous power control is performed according to the following steps: When a target is secretly deceived, in order to allow the signal to be secretly cut in, the power of the transmitted signal needs to be accurately controlled. Ideally, the power of the deceptive signal received by the target should be only slightly greater than the actual signal. If the power is too large, it is easy to be discovered by anti-interference means. If it is too small, it cannot be cut in and its time is pulled off. Therefore, for node i, to calculate the size of the transmit power, it is first necessary to know the spatial distance L between the node and the target. i .

[0067]

[0068] Among them, the master control device can be based on the target parameter (θ h ,θ p ,L) and its own position (x,y,z) and the node position (x i ,y i ,z i ) calculated.

[0069] According to the spatial attenuation formula of the signal, the spatial attenuation of the signal P L for

[0070] P L =20·lg(4π / c)+20lg(f)+20lg(d)

[0071] =32.5+20lg(f)+20lg(d) (12)

[0072] Where f is the frequency of the signal and d is the distance, then the signal attenuation from the i-th node to the target in this system is

[0073] P Li =32.5+20lg(f i )+20lg(L i ) (13)

[0074] where f i is the frequency of the deceptive signal, L i is the distance to the target. The spatial attenuation from the node to the target is P Li The host computer can i With L i Calculated and sent to each node.

[0075] Since each node simulates the signal of a navigation satellite separately, let the actual signal power of the satellite received by the receiver of the node be P i, then the node should transmit the signal with a power P ei for

[0076] P ei =P Li +P i +P c (14)

[0077] Where P c For power compensation, it is mainly the sum of the difference between real signals at different locations and the power advantage required for the deceptive signal to cut in, usually 1-3dbm. It can be known from the previous formula.

[0078] P ei =32.5+20lg(f i )+20lg(L i )+P i +P c (15)

[0079] Among them, the frequency of the deceptive signal f i Distance from target L i The real signal power P is sent by the main control device. i The receiver of the node measures and calculates the transmission power P ei .

[0080] In one embodiment, time synchronization between nodes is performed according to the following steps: Time synchronization between nodes is the key to implementing distributed deception, and its function is to enable each node to transmit signals at the same time to simulate the real signal as much as possible and bypass interference detection. Since each node simulates a satellite, if the time difference between the signals transmitted by each node is too large, it will affect the reception effect of the receiver. Under normal circumstances, the actual transmission time of the signals that should be sent synchronously is different, which will affect the cutting-in of the deceptive signal and the time deviation effect after cutting-in, and also increase the probability of being identified by anti-interference means. If the time difference is large to a certain extent, it will cause the target receiver to be unable to lock the signal. Therefore, the better the effect of time synchronization between nodes, the better the effect of system concealment deception.

[0081] In order to achieve remote precise time synchronization and take into account the communication between nodes and the main control device, this system adopts a two-way time synchronization method to measure the time difference between two sites. The two-way signal uses a spread spectrum signal modulated by BPSK. The mid-frequency carrier is 70MHz. After up-conversion, it is Ku band for wireless transmission. Its signal structure is a triple structure of carrier, spread spectrum code, and telegram, similar to GPS navigation signal. In addition to the carrier, the spread spectrum code uses gold code, which is mainly used for code division multiple access and pseudorange measurement. Code division multiple access is to achieve communication and time comparison between a main control device and multiple node devices, while pseudorange measurement is to calculate the time difference between two stations. Signals at the telegram level are mainly used to transmit data between the main control device and the node device, mainly including parameters used to calculate the time difference and control parameters and instructions issued by the main control module, such as the parameter θ of the control node servo antenna. hi and θ pi , and calculate the node transmit power f i and L i In addition, some control instructions and configuration information are also sent down through the message layer.

[0082] The principle of time difference measurement is as follows. Assume that the time difference between node device i and the master device is ΔT. When the two-way devices detect the local 1pps pulse, they transmit time synchronization signals to each other. When the master device receives the signal, it measures the pseudo-range ρ1 between the two stations. Since the time base difference between the two stations is ΔT, the time corresponding to the pseudo-range is T1.

[0083]

[0084] Among them, R1 is the true distance between node i and the master device, and C is the speed of light. For the signal sent by the master device received by node i, the pseudorange of the received signal is ρ2. Due to the time base difference ΔT between the two, the time corresponding to the pseudorange is

[0085]

[0086] R2 is the true distance from the master to node i. Since it is a two-way communication, the true distances of the two links are the same, that is, R1 = R2. Subtracting the two equations, we get

[0087]

[0088] From the above formula, we can know that the time difference between the master device and node i is calculated by the pseudo-ranges measured by the two. The time synchronization between the two can be achieved by compensating the time difference through software.

[0089] When the two-way time synchronization device is working, the two transmit two-way signals based on the local 1pps second pulse, with a frequency of once per second. The spread spectrum code layer in the signal is used for code division multiple access and pseudo-range measurement, and the telegram layer is used to transmit the locally measured pseudo-range to the other party, as well as the communication function, for the master control device to send the horizontal angle θ to each node. hi , pitch angle θ pi , deceptive signal frequency f i 、Target distance L i And other parameters and related control instructions.

[0090] Under the two-way time comparison system, each node can synchronize with the main control device at the sub-second level, while the second-level time synchronization is achieved by sending the time from each satellite receiver. The combination of the two ultimately achieves nanosecond-level time alignment between each node and the main control device. The spoofing signals generated at each point can be sent out synchronously.

[0091] The above-mentioned embodiment constructs a distributed GNSS timing covert deception device, which uses a generative deception method and, based on the four-sphere positioning principle, synchronously changes the code phase of the signal when generating the deception signal, thereby achieving covert deception of stationary targets, thereby solving the problem that existing deception interference methods are difficult to achieve covert entry deception.

[0092] Embodiment 3

[0093] Based on the same technical concept, an embodiment of the present invention also provides a method for controlling a distributed GNSS timing covert deception device. Since the principle of solving the problem by the above method is similar to that of the distributed GNSS timing covert deception device, the implementation of the above method can refer to the implementation of the device, and the repeated parts will not be repeated.

[0094] An embodiment of the present invention provides a method for controlling a distributed GNSS timing covert deception device, the method being executed by a processor and comprising the following steps:

[0095] Step 1: The target detection device sends target location information to the main control device.

[0096] Step 2: The main control device receives the target location information, determines the deception strategy according to the power of the real GNSS signal and the target location information, obtains the time synchronization and communication signals, and sends the target location information and the time synchronization and communication signals to the distributed signal generating device.

[0097] Step three, the distributed signal generating device receives the time synchronization and communication signal, the target position information and the real GNSS signal, measures the time difference between the local atomic clock and the atomic clock of the main control device, obtains the time difference and parameter instructions, obtains the spoofing signal according to the time difference and parameter instructions and the navigation positioning information, obtains the signal transmission module control instruction according to the target position information, and sends the spoofing signal and the signal transmission module control instruction to the signal transmission module.

[0098] Step 4: The signal transmitting module receives the signal transmitting module control instruction and the spoofing signal, and transmits the spoofing signal through the servo antenna.

[0099] To sum up, in the embodiments of the present invention, the distributed GNSS timing covert deception device uses generative deception and, based on the four-sphere positioning principle, synchronously changes the code phase of the signal when generating the deception signal, thereby achieving the goal of changing the time without changing the positioning, thereby achieving the purpose of covert deception of stationary targets.

[0100] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0101] Those skilled in the art know that, in addition to implementing the device and its various sub-devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to implement the same functions of the device and its various sub-devices, modules, and units provided by the present invention in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, etc. by performing logic programming on the method steps. Therefore, the device and its various sub-devices, modules, and units provided by the present invention can be regarded as structures within hardware components or as software modules for implementing methods.

[0102] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A distributed GNSS timing covert deception device, characterized in that: It includes a target detection device, a main control device, a plurality of distributed signal generating devices, a plurality of signal transmitting modules and a plurality of servo antennas, wherein the target detection device is communicatively connected to the main control device, the main control device is communicatively connected to each distributed signal generating device, each distributed signal generating device is connected to a corresponding signal transmitting module, and each signal transmitting module is communicatively connected to a corresponding servo antenna, wherein: The target detection device is used to send target location information to the main control device; The master control device is used to receive the target location information, determine the deception strategy according to the power of the real GNSS signal and the target location information, obtain the time synchronization and communication signal, and send the target location information and the time synchronization and communication signal to the distributed signal generation device; The distributed signal generating device is used to receive the time synchronization and communication signal, the target location information and the real GNSS signal, measure the time difference between the local atomic clock and the atomic clock of the master control device, obtain the time difference and parameter instructions, obtain the spoofing signal according to the time difference and parameter instructions and the navigation positioning information, obtain the signal transmission module control instruction according to the target location information, and send the spoofing signal and the signal transmission module control instruction to the signal transmission module; The signal transmitting module is used to receive the signal transmitting module control instruction and the spoofing signal, and transmit the spoofing signal through the servo antenna.

2. The device according to claim 1, characterized in that The distributed signal generating device includes a time synchronization and communication module, a baseband signal generating module, a radio frequency module, a satellite receiver and an atomic clock. The time synchronization and communication module is communicatively connected to the baseband signal generating module, and the baseband signal generating module is communicatively connected to the radio frequency module, the satellite receiver and the atomic clock respectively, wherein: The time synchronization and communication module is used to receive the time synchronization and communication signal, measure the time difference between the local atomic clock and the atomic clock of the master control device, obtain the time difference and parameter instructions, and send the time difference and parameter instructions to the baseband signal generation module; The satellite receiver is used to receive real GNSS signals, obtain navigation and positioning information according to the real GNSS signals, and send the navigation and positioning information to the baseband signal generation module; The baseband signal generating module is used to receive the target position information, the time difference and parameter instruction and the navigation positioning information, determine the transmission signal power and the servo antenna angle according to the target position information, obtain the signal transmission module control instruction, calibrate the local time according to the time difference and parameter instruction, obtain the time deception baseband signal according to the time difference and parameter instruction and the navigation positioning information, send the signal transmission module control instruction to the signal transmission module, and send the time deception baseband signal to the radio frequency module; The radio frequency module is used to receive the time spoofing baseband signal, perform frequency conversion on the time spoofing baseband signal to obtain a spoofing signal, and send the spoofing signal to the signal transmitting module; The atomic clock is used to provide an external time base and an external frequency standard for the baseband signal generation module.

3. The device according to claim 2, characterized in that The transmit signal power is calculated according to the following formula: P ei =P Li +P i +P c P Li =32.5+201g(f i )+201g(L i ) Among them, P ei is the transmission signal power, that is, the distributed signal generating device of the i-th node needs to control the transmission signal power of the servo antenna, P Li is the signal attenuation from the i-th node to the target, P i is the power of the real GNSS signal received by the satellite receiver of the ith node, f i is the frequency of the deceptive signal of the i-th node, L i is the spatial distance between the ith node and the target, (x i ,y i , z i ) is the coordinate of the distributed signal generating device of the ith node, (x T ,y T , z T ) is the target coordinate, (θ h ,θ p , L) is the horizontal angle, pitch angle and distance of the target from the main control device measured by the target detection device, and (x, y, z) is the latitude and longitude of the main control device position measured by the satellite receiver of the main control device.

4. The device according to claim 2, characterized in that The servo antenna angle is calculated according to the following formula: x T =L·cos(θ p )·sin(θ h )+x y T =L·cos(θ p )·cos(θ h )+y With T =L sin(θ p )+with Among them, θ hi ,θ pi is the servo antenna angle, θ hi The distributed signal generating device of the i-th node needs to control the horizontal angle of the servo antenna to aim at the target, θ pi The distributed signal generating device of the i-th node needs to control the pitch angle of the servo antenna to aim at the target, (x i ,y i , z i ) is the coordinate of the distributed signal generating device of the i-th node, (θ h ,θ p , L) is the horizontal angle, pitch angle and distance of the target from the main control device measured by the target detection device, (x T ,y T , z T ) is the target coordinate, (x, y, z) is the latitude and longitude of the main control device position measured by the satellite receiver of the main control device.

5. The device according to claim 1, characterized in that The main control device includes an industrial control computer, a main control device time synchronization and communication module, a main control device satellite receiver and a main control device atomic clock. The industrial control computer is respectively connected to the main control device time synchronization and communication module, the main control device satellite receiver and the main control device atomic clock, wherein: The industrial computer is used to receive the target location information, determine the deception strategy according to the power of the real GNSS signal and the target location information, obtain the strategy parameters and strategy instructions, and send the target location information and the strategy parameters and strategy instructions to the time synchronization and communication module of the main control device; The master control device time synchronization and communication module is used to receive the target location information and the strategy parameters and strategy instructions, obtain time synchronization and communication signals according to the strategy parameters and strategy instructions, and send the target location information and the time synchronization and communication signals to each distributed signal generating device; The satellite receiver of the master control device is used to receive real GNSS signals, obtain navigation and positioning information according to the real GNSS signals, and send the navigation and positioning information to the industrial computer; The master control device atomic clock is used to provide an external time base and an external frequency standard for the industrial computer.

6. The device according to claim 1, characterized in that The time difference between the local atomic clock and the master atomic clock is calculated according to the following formula: Among them, ΔT is the time difference between the local atomic clock and the atomic clock of the main control device, that is, the time difference between the distributed signal generating device of the i-th node and the main control device, ρ1 is the pseudorange between the distributed signal generating device of the i-th node and the main control device, ρ2 is the pseudorange of the time synchronization and communication signals received by the distributed signal generating device of the i-th node, and C is the speed of light.

7. A method for controlling the distributed GNSS timing covert deception device according to any one of claims 1 to 6, characterized in that: include: The target detection device sends target location information to the main control device; The master control device receives the target location information, determines a deception strategy according to the power of the real GNSS signal and the target location information, obtains time synchronization and communication signals, and sends the target location information and the time synchronization and communication signals to the distributed signal generating device; The distributed signal generating device receives the time synchronization and communication signal, the target location information and the real GNSS signal, measures the time difference between the local atomic clock and the atomic clock of the master control device, obtains the time difference and parameter instruction, obtains the spoofing signal according to the time difference and parameter instruction and the navigation positioning information, obtains the signal transmission module control instruction according to the target location information, and sends the spoofing signal and the signal transmission module control instruction to the signal transmission module; The signal transmitting module receives the signal transmitting module control instruction and the spoofing signal, and transmits the spoofing signal through the servo antenna.

8. The method according to claim 7, characterized in that The distributed signal generating device receives the time synchronization and communication signal, the target location information and the real GNSS signal, measures the time difference between the local atomic clock and the atomic clock of the master control device, obtains the time difference and parameter instruction, obtains the spoofing signal according to the time difference and parameter instruction and the navigation positioning information, obtains the signal transmission module control instruction according to the target location information, and sends the spoofing signal and the signal transmission module control instruction to the signal transmission module, specifically including: The time synchronization and communication module receives the time synchronization and communication signal, measures the time difference between the local atomic clock and the atomic clock of the master control device, obtains the time difference and parameter instruction, and sends the time difference and parameter instruction to the baseband signal generation module; The satellite receiver receives the real GNSS signal, obtains navigation positioning information according to the real GNSS signal, and sends the navigation positioning information to the baseband signal generation module; The baseband signal generating module receives the target position information, the time difference and parameter instruction and the navigation positioning information, determines the transmission signal power and the servo antenna angle according to the target position information, obtains the signal transmitting module control instruction, calibrates the local time according to the time difference and parameter instruction, obtains the time deception baseband signal according to the time difference and parameter instruction and the navigation positioning information, sends the signal transmitting module control instruction to the signal transmitting module, and sends the time deception baseband signal to the radio frequency module; The radio frequency module receives the time spoofing baseband signal, performs frequency conversion on the time spoofing baseband signal to obtain a spoofing signal, and sends the spoofing signal to the signal transmitting module; The atomic clock provides an external time base and an external frequency standard for the baseband signal generation module.

9. The method according to claim 8, characterized in that The transmit signal power is calculated according to the following formula: P ei =P Li +P i +P c P Li =32.5+20lg(f i )+20lg(L i ) Among them, P ei is the transmission signal power, that is, the distributed signal generating device of the i-th node needs to control the transmission signal power of the servo antenna, P Li is the signal attenuation from the i-th node to the target, P i is the power of the real GNSS signal received by the satellite receiver of the ith node, f i is the frequency of the deceptive signal of the i-th node, L i is the spatial distance between the ith node and the target, (x i ,y i , z i ) is the coordinate of the distributed signal generating device of the ith node, (x T ,y T , z T ) is the target coordinate, (θ h ,θ p , L) is the horizontal angle, pitch angle and distance of the target from the main control device measured by the target detection device, and (x, y, z) is the latitude and longitude of the main control device position measured by the satellite receiver of the main control device.

10. The method according to claim 8, characterized in that The servo antenna angle is calculated according to the following formula: x T =L·cos(θ p )·sin(θ h )+x y T =L·cos(θ p )·cos(θ h )+y With T =L sin(θ p )+with Among them, θ hi ,θ pi is the servo antenna angle, θ hi The distributed signal generating device of the i-th node needs to control the horizontal angle of the servo antenna to aim at the target, θ pi The distributed signal generating device of the i-th node needs to control the pitch angle of the servo antenna to aim at the target, (x i ,y i , z i ) is the coordinate of the distributed signal generating device of the i-th node, (θ h ,θ p , L) is the horizontal angle, pitch angle and distance of the target from the main control device measured by the target detection device, (x T ,y T , z T ) is the target coordinate, (x, y, z) is the latitude and longitude of the main control device position measured by the satellite receiver of the main control device.

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