A distributed GNSS time-provisioning deception device and method

Abstract

The application discloses a kind of distributed GNSS timing covert deception equipment and its control method, equipment includes: target detection equipment, for sending target position information to master control device;Master control device, for receiving target position information, determine deception strategy, obtain time synchronization and communication signal;Distributed signal generation equipment, for receiving time synchronization and communication signal, target position information and real GNSS signal, measure the time difference between local atomic clock and master control device atomic clock, obtain time difference and parameter instruction, according to time difference and parameter instruction and navigation positioning information, obtain deception signal, according to target position information, obtain signal emission module control instruction;Signal emission module, for receiving signal emission module control instruction and deception signal, emit deception signal by servo antenna.The distributed GNSS timing covert deception equipment and its control method of the application change the code phase of signal synchronously when generating deception signal, so as to realize covert deception.

Description

Technical Field

[0001] This invention relates to the fields of time deception, satellite navigation, time synchronization, and electronic countermeasures, and in particular to a distributed GNSS time synchronization covert deception device and its control method. Background Technology

[0002] With the widespread application of Navigation Satellite Systems (GNSS), more and more systems and devices are using GNSS receivers as their primary time synchronization method. Therefore, in the field of electronic warfare, deceiving and jamming the time synchronization function of satellite navigation receivers has become an important issue. For systems such as UAV swarms, power distribution networks, and distributed radar, effectively deceiving and jamming their time references can significantly impair their operational efficiency. However, with the development of anti-deception jamming technology for receivers, deceiving and jamming the target time reference needs to possess a high degree of stealth. Deceiving and jamming methods for navigation receivers are mainly divided into relay jamming and generation jamming. While relay jamming can forward the real navigation signal and delay it, it can only perform asynchronous deception and cannot achieve synchronous deception. It requires prior power suppression before deception jamming, but the suppression phase can cause abnormal receiver power, making it easily detectable and difficult to achieve stealthy deception. Summary of the Invention

[0003] This invention proposes a distributed GNSS timing covert deception device and its control method to solve the problem that existing deception and interference methods are difficult to achieve covert infiltration deception.

[0004] This invention provides the following technical solution:

[0005] Firstly, this specification provides a distributed GNSS timing covert deception device, including a target detection device, a main control device, multiple distributed signal generation devices, multiple signal transmission modules, and multiple servo antennas. The target detection device is communicatively connected to the main control device, the main control device is communicatively connected to each distributed signal generation device, each distributed signal generation device is connected to a corresponding signal transmission module, and each signal transmission 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 main control device is used to receive the target location information, determine a deception strategy based on the power of the real GNSS signal and the target location information, obtain time synchronization and communication signals, and send the target location information and the time synchronization and communication signals to the distributed signal generation device.

[0008] The distributed signal generation 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 main control device atomic clock, obtain the time difference and parameter instructions, obtain a deception signal based on the time difference and parameter instructions and the navigation and positioning information, obtain a signal transmission module control instruction based on the target location information, and send the deception signal and the signal transmission module control instruction to the signal transmission module.

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

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

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

[0012] The main control device receives the target location information, determines a deception strategy based on 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 generation device.

[0013] The distributed signal generation 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 main control device atomic clock, obtains the time difference and parameter instructions, obtains a deception signal based on the time difference and parameter instructions and the navigation and positioning information, obtains a signal transmission module control instruction based on the target location information, and sends the deception signal and the signal transmission module control instruction to the signal transmission module.

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

[0015] The distributed GNSS timing covert deception device and its control method provided in this embodiment of the invention use a generative deception method. At the same time, based on the four-sphere positioning principle, the code phase of the signal is changed synchronously when generating the deception signal to achieve covert deception of stationary targets, thereby solving the problem that existing deception and interference methods are difficult to achieve covert entry deception. Attached Figure Description

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

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

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

[0019] Figure 4 This is a flowchart illustrating the workflow of a distributed GNSS timing covert deception device in an embodiment of the present invention.

[0020] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this specification clearer, the technical solutions of this specification will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of them. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this specification.

[0022] As described herein, the term “comprising” and its various variations can be understood as open-ended terms that mean “including but not limited to”, and the term “one embodiment” can be understood as “at least one embodiment”.

[0023] The inventors discovered that existing deception jamming devices cannot achieve covert intrusion deception, resulting in receiver power anomalies during the suppression phase that are easily detected. Furthermore, anti-spoofing technologies such as array-type anti-jamming antennas, signal direction-of-arrival detection, and signal angle-of-arrival detection have been widely used in recent years. In view of this, to achieve covert deception of the receiver, it is not possible to use a deception signal from a single direction of arrival. A distributed deception jamming system capable of synchronously transmitting deception signals is needed. In this embodiment of the invention, a generative deception method is adopted, and the code phase of the signal is synchronously changed when generating the deception signal based on the four-ball positioning principle, so as to achieve covert deception of stationary targets.

[0024] Example 1

[0025] Figure 1The diagram schematically illustrates the overall system block diagram of a distributed GNSS timing concealment deception device according to an embodiment of this application, including a target detection device, a main control device, multiple distributed signal generation devices, multiple signal transmission modules, and multiple servo antennas. The target detection device is communicatively connected to the main control device, the main control device is communicatively connected to each distributed signal generation device, each distributed signal generation device is connected to a corresponding signal transmission module, and each signal transmission 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 main control device is used to receive the target location information, determine a deception strategy based on the power of the real GNSS signal and the target location information, obtain time synchronization and communication signals, and send the target location information and the time synchronization and communication signals to the distributed signal generation device.

[0028] The distributed signal generation 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 main control device atomic clock, obtain the time difference and parameter instructions, obtain a deception signal based on the time difference and parameter instructions and the navigation and positioning information, obtain a signal transmission module control instruction based on the target location information, and send the deception signal and the signal transmission module control instruction to the signal transmission module.

[0029] The signal transmitting module is used to receive the control command of the signal transmitting module and the deception signal, and to transmit the deception 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. 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.

[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 main control device atomic clock, obtain the time difference and parameter command, and send the time difference and parameter command to the baseband signal generation module.

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

[0033] The baseband signal generation module is used to receive the target location information, the time difference and parameter instructions, and the navigation and positioning information; determine the transmission signal power and servo antenna angle based on the target location information; obtain the signal transmission module control instructions; calibrate the local time based on the time difference and parameter instructions; obtain the time deception baseband signal based on the time difference and parameter instructions and the navigation and positioning information; send the signal transmission module control instructions 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 deception baseband signal, convert the frequency of the time deception baseband signal to obtain a deception signal, and send the deception 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] In practice, the transmitted 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 The transmitted signal power, i.e., the transmitted signal power that the distributed signal generator of the i-th node needs to control for the servo antenna, P Li For the signal attenuation from the i-th node to the target, P i f is the power of the actual GNSS signal received by the satellite receiver at the i-th node. i Let L be the frequency of the spoofing signal of the i-th node. i Let x be the spatial distance between the i-th node and the target. i ,y i ,z i Let (x) be the coordinates of the distributed signal generating device of the i-th node. T ,y T ,z T (θ) represents the target coordinates. h ,θ p(L) represents the horizontal angle, elevation angle, and distance between the target and the main control equipment as measured by the target detection equipment, and (x,y,z) represents the latitude, longitude, and altitude of the main control equipment as measured by the satellite receiver of the main control equipment.

[0041] In practice, the servo antenna angle is calculated using the following formula:

[0042]

[0043]

[0044] Where, θ hi θ pi Let θ be the angle of the servo antenna. hi The distributed signal generator at node i needs to control the horizontal angle θ between the servo antenna and the target. pi The distributed signal generator at the i-th node needs to control the elevation angle of the servo antenna aimed at the target, (x i ,y i ,z i Let θ be the coordinates of the distributed signal generator at the i-th node. h ,θ p (x, L) represents the horizontal angle, elevation angle, and distance between the target and the main control equipment as measured by the target detection equipment. T ,y T ,z T (x, y, z) represents the target coordinates, and (x, y, z) represents the latitude, longitude, and altitude of the main control equipment as measured by the satellite receiver of the main control equipment.

[0045] In one embodiment, 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 communicatively connected to the main control device time synchronization and communication module, the main control device satellite receiver, and the main control device atomic clock, respectively.

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

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

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

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

[0051]

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

[0053] The above embodiments construct a distributed GNSS timing covert deception device. It 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 to achieve covert deception of stationary targets. This solves the problem that existing deception and interference methods are difficult to achieve covert infiltration deception.

[0054] Example 2

[0055] Figure 1 This diagram schematically illustrates the overall system block diagram of a distributed GNSS timing concealment deception device according to one embodiment of this application. The system mainly consists of target detection equipment, a main control device, and signal generation equipment, signal transmission modules, and servo antennas corresponding to each distributed node. The target detection equipment mainly consists of a detection radar, and the signal transmission modules consist of power amplifiers. In practical use, each distributed signal generation device is deployed at different locations to perform multi-directional jamming and deception of the target.

[0056] In specific implementation, such as Figure 2The diagram shows a distributed signal generation device for each node. The time synchronization and communication module is responsible for communicating with the master control device and measuring the time difference between the local atomic clock and the master control device's atomic clock. The atomic clock provides a stable external time base and frequency standard for the system. The baseband signal generation module generates a corresponding time deception baseband signal based on parameter commands issued by the master control module and received data such as the current ephemeris, pseudorange, and time. This baseband signal is frequency-converted by the RF module to generate a deception signal, which is then amplified by a power amplifier and servo antenna before being emitted to deceive and interfere with the target. Furthermore, the baseband signal generation module calibrates the local time based on the time base difference measured by the time synchronization and communication module to achieve time synchronization between different nodes. The baseband signal generation module also controls the signal transmission module to change the power of the transmitted signal and the angle of the servo antenna based on the target location information and deception strategy issued by the master control device, achieving targeted and covert deception of the target.

[0057] In specific implementation, such as Figure 3 As shown, the main control equipment is primarily used to control each transmitting node to use a unified strategy to deceive and jam the target. Its core is an industrial control computer, which, during operation, formulates a deception strategy based on the target position information and motion state obtained from the target detection equipment, as well as the power of the actual satellite signal received by the receiver. The generated strategy parameters and instructions are sent to the signal generation equipment of each node through a time synchronization and communication module. The external synchronization and communication module of this main control equipment also needs to be synchronized with the signal generation equipment of each node.

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

[0059] In one implementation, distributed deception is performed according to the following steps: Real satellite navigation signals originate from different satellites, so the signal emitted by each satellite appears to the target from a different direction. To bypass the receiver's anti-jamming mechanisms and implement covert time deception, deceptive signals from different satellites need to be transmitted towards the target from different directions to counter anti-deception techniques such as angle-of-arrival detection. Therefore, this design employs a distributed approach, deploying signal generation device nodes at different locations. Each device generates and transmits a deceptive signal from only a single satellite. For example, if the real signals received by the satellite receiver of the master control device come from GPS PRN satellites numbered 1, 3, 7, 9, 10, 11, and 16, the master control device will control signal generation devices 1, 2, 3, 4, 5, and 6 to simulate navigation signals from these satellites and transmit them to the target to simulate real signals from different directions.

[0060] In one implementation, directional deception is performed according to the following steps: To concentrate the power of the deception signal and achieve a greater deception range, this design employs a servo-controlled directional antenna aiming at the target. Because a distributed signal generation method is used, the distance between each node is relatively large. Therefore, the main control device needs to calculate the servo antenna control parameters (horizontal and elevation angles) for each distributed node based on the target position measured by the target detection device, and then distribute these parameters to each node, causing its antenna to aim at the same target from different directions. The calculation formula is shown below.

[0061] Let the latitude, longitude, and altitude of the main control equipment as measured by the satellite receiver be (x, y, z), and the horizontal angle, elevation angle, and distance of the target from the main control equipment as measured by the target detection equipment be (θ). h ,θ p The target's coordinates (x, L). T ,y T ,z T )for

[0062]

[0063] Let the coordinates of the distributed signal generator at the i-th node be (x, y). i ,y i ,z i Then the node device needs to control the parameters of the servo antenna to align with the target, namely the horizontal angle θ. hi Pitch angle θ pi , respectively

[0064]

[0065] The horizontal angle θ in the above formula hi Pitch angle θ pi The location of the main control equipment (latitude, longitude, and altitude, x, y, z) and the target parameters (θ) are determined by the latitude, longitude, and altitude of the main control equipment. h ,θ p The position coordinates (x, L) of the i-th node i ,y i ,z i These parameters are calculated. They can be measured by the receiver and target detection radar of their respective devices. The coordinates of the master control device (x, y, z) and the coordinates of the node device (x...) are... i ,y i ,z i The horizontal angle θ of the node control antenna remains constant during equipment use. hi Pitch angle θ pi The main control equipment determines the target parameters (θ) based on the radar target parameters. h ,θ pThe time synchronization and communication modules are used to calculate and distribute the time (L) data to each node device in real time.

[0066] In one implementation, synchronization power control is performed according to the following steps: When performing covert deception on a target, in order for the signal to stealthily penetrate, the power of the transmitted signal needs to be precisely controlled. Ideally, the power of the deception signal received by the target should be only slightly greater than the actual signal. If the power is too high, it will be easily detected by anti-jamming measures; if it is too low, it will be unable to penetrate and its timing will be skewed. Therefore, for node i, to calculate the magnitude of the transmitted power, it is first necessary to know the spatial distance L between the node and the target. i .

[0067]

[0068] Among them, the main control equipment can determine the target parameters (θ) based on the target parameters. h ,θ p (L) and its own position (x,y,z) and the position of this node (x i ,y i ,z i ) was calculated.

[0069] According to the spatial attenuation formula for signals, the spatial attenuation P of the signal... 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 signal frequency 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 For the frequency of the deception signal, L i This represents the distance from the target. The spatial attenuation P from this node to the target. Li It can be controlled by the main computer according to f i With L i The calculations are then performed and distributed to each node.

[0075] Since each node simulates the signal of a single navigation satellite, let P be the actual signal power received by the receiver of that node from that satellite. iThen, the power P of the signal that the node should transmit at this time is... ei for

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

[0077] Where P c Power compensation mainly consists of the difference in actual signal strength at different locations and the power advantage required for deceptive signal insertion, typically ranging from 1 to 3 dBm. This can be seen 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 f of the deception signal i Distance L from the target i The actual signal power P is obtained from the main control equipment. i The transmit power P is then measured by the receiver at that node and calculated. ei .

[0080] In one implementation, time synchronization between nodes is performed according to the following steps: Time synchronization between nodes is crucial for implementing distributed deception. Its function is to ensure that each node transmits signals simultaneously at the same time, thereby simulating real signals as closely as possible and bypassing interference detection. Since each node simulates a satellite, excessive time differences between the signals transmitted by each node will affect the receiver's reception. Typically, signals that should be transmitted synchronously are actually transmitted at different times, which affects the insertion of the deception signal and the time offset effect after insertion, increasing the probability of being detected by anti-jamming measures. If the time difference is large enough, the target receiver will be unable to lock onto the signal. Therefore, the better the time synchronization between nodes, the better the system's covert deception effect.

[0081] To achieve precise remote time synchronization while also facilitating communication between nodes and the master control device, this system employs a bidirectional time synchronization method to measure the time difference between two stations. The bidirectional signal uses a BPSK-modulated spread spectrum signal with a 70MHz mid-frequency carrier, up-converted to the Ku-band for wireless transmission. Its signal structure is a triple structure of carrier, spreading code, and message, similar to GPS navigation signals. Besides the carrier, the spreading code uses gold code, primarily for code division multiple access (CDMA) and pseudorange measurement. CDMA enables communication and time comparison between a master control device and multiple node devices, while pseudorange measurement is used to calculate the time difference between two stations. The message layer signal is mainly used for data transmission between the master control device and node devices, including parameters used for calculating the time difference and control parameters and commands issued by the master control module, such as the parameter θ for controlling the node servo antenna. hi and θ pi And the f of the node's transmit power i and L i In addition, some control commands and configuration information are also sent through the message layer.

[0082] The time difference measurement principle is as follows. Let the time difference between node device i and the master control device be ΔT. When the bidirectional device detects a local 1pps pulse, it transmits a time synchronization signal to each other. After the master control device receives the signal, it measures the pseudorange ρ1 between the two stations. Since the time base difference between the two stations is ΔT, the time corresponding to the pseudorange is T1.

[0083]

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

[0085]

[0086] R2 is the true distance from the master controller to node i. Since it is bidirectional communication, the true distances of the sending and receiving links are the same, i.e., R1 = R2. Subtracting the two equations, we get...

[0087]

[0088] As shown in the above formula, the time difference between the master control device and node i is calculated from the pseudorange measured by both. Time synchronization between the two can be achieved by compensating for the time difference through software.

[0089] When the two-way time synchronization device is working, both sides transmit bidirectional signals based on the local 1pps second pulse, at a frequency of once per second. The spreading code layer of the signal is used for code division multiple access and pseudorange measurement, while the message layer is used to transmit the locally measured pseudorange to the other party, and also serves as a communication function, used by the master control device to send the horizontal angle θ to each node. hi Pitch angle θ pi Deception signal frequency f i Target distance L i Parameters and related control commands.

[0090] In a two-way time comparison system, each node and the main control device can achieve sub-second time synchronization, while second-level time synchronization is achieved by the time transmitted from their respective satellite receivers. The combined effect of these two methods ultimately achieves nanosecond-level time alignment between each node and the main control device. This ensures that the deception signals generated at each node can be transmitted synchronously.

[0091] The above embodiments construct a distributed GNSS timing covert deception device. It 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 to achieve covert deception of stationary targets. This solves the problem that existing deception and interference methods are difficult to achieve covert infiltration deception.

[0092] Example 3

[0093] Based on the same technical concept, this invention also provides a method for controlling a distributed GNSS timing covert deception device. Since the principle of the above method in solving the problem 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 described again.

[0094] This invention provides a method for controlling a distributed GNSS timing covert deception device, the method being executed by a processor and including the following steps:

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

[0096] Step 2: The main control device receives the target location information, determines a deception strategy based on 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 generation device.

[0097] Step 3: The distributed signal generation 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 main control device atomic clock; obtains the time difference and parameter instructions; obtains a deception signal based on the time difference and parameter instructions and the navigation and positioning information; obtains a signal transmission module control instruction based on the target location information; and sends the deception 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 command and the deception signal, and transmits the deception signal through the servo antenna.

[0099] In summary, in this embodiment of the invention, the distributed GNSS timing covert deception device uses generative deception. At the same time, based on the four-sphere positioning principle, it synchronously changes the code phase of the signal when generating the deception signal, thereby achieving the purpose of covertly deceiving stationary targets without changing the positioning.

[0100] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0101] Those skilled in the art will understand that, in addition to implementing the device and its various sub-devices, modules, and units provided by this invention in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, etc., the same functions can be achieved entirely through logical programming of the method steps. Therefore, the device and its various sub-devices, modules, and units provided by this invention can be regarded as structures within hardware components or as software modules for implementing the method.

[0102] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A distributed GNSS timing covert deception device, characterized in that, The system includes a target detection device, a main control device, multiple distributed signal generation devices, multiple signal transmission modules, and multiple servo antennas. The target detection device is communicatively connected to the main control device. The main control device is communicatively connected to each distributed signal generation device. Each distributed signal generation device is connected to a corresponding signal transmission module. Each signal transmission module is communicatively connected to a corresponding servo antenna. The target detection device is used to send target location information to the main control device; The main control device is used to receive the target location information, determine a deception strategy based on the power of the real GNSS signal and the target location information, obtain time synchronization and communication signals, and send the target location information and the time synchronization and communication signals to the distributed signal generation device. The distributed signal generation 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 main control device atomic clock, obtain the time difference and parameter instructions, obtain a deception signal based on the time difference and parameter instructions and navigation and positioning information, obtain a signal transmission module control instruction based on the target location information, and send the deception 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 command and the deception signal, and to transmit the deception signal through the servo antenna; 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. 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. 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 main control device atomic clock, obtain the time difference and parameter command, and send the time difference and parameter command to the baseband signal generation module. The satellite receiver is used to receive real GNSS signals, obtain navigation and positioning information based on the real GNSS signals, and send the navigation and positioning information to the baseband signal generation module; The baseband signal generation module is used to receive the target location information, the time difference and parameter instructions, and the navigation and positioning information; determine the transmission signal power and servo antenna angle based on the target location information; obtain the signal transmission module control instructions; calibrate the local time based on the time difference and parameter instructions; obtain the time deception baseband signal based on the time difference and parameter instructions and the navigation and positioning information; send the signal transmission module control instructions 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, convert the frequency of 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 external frequency standard for the baseband signal generation module; The transmitted signal power is calculated using the following formula: in, The transmitted signal power refers to the transmitted signal power that the distributed signal generator of the i-th node needs to control for the servo antenna. For the signal attenuation from the i-th node to the target, Let be the power of the actual GNSS signal received by the satellite receiver at the i-th node. Let be the frequency of the deception signal of the i-th node. Let be the spatial distance between the i-th node and the target. Let be the coordinates of the distributed signal generator at the i-th node. For the target coordinates, The horizontal angle, elevation angle, and distance between the target and the main control equipment are measured by the target detection equipment. The latitude, longitude, and altitude of the main control equipment are measured by the satellite receiver of the main control equipment. The sum of power compensation, the difference in real signals at different locations, and the power advantage required for deceptive signal insertion is 1-3 dBm.

2. The device according to claim 1, characterized in that, The servo antenna angle is calculated using the following formula: in, , The angle of the servo antenna. The distributed signal generating device at the i-th node needs to control the horizontal angle of the servo antenna aligned with the target. The distributed signal generator at the i-th node needs to control the elevation angle of the servo antenna aimed at the target. Let be the coordinates of the distributed signal generator at the i-th node. The horizontal angle, elevation angle, and distance between the target and the main control equipment are measured by the target detection equipment. For the target coordinates, The latitude, longitude, and altitude of the main control equipment are measured by the satellite receiver of the main control equipment.

3. 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 communicatively connected to the main control device time synchronization and communication module, the main control device satellite receiver, and the main control device atomic clock, respectively. The industrial control computer is used to receive the target location information, determine a deception strategy based on the power of the real GNSS signal and the target location information, obtain 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 main control device time synchronization and communication module is used to receive the target location information and the strategy parameters and strategy instructions, obtain the time synchronization and communication signal according to the strategy parameters and strategy instructions, and send the target location information and the time synchronization and communication signal to each distributed signal generation device. The main control device satellite receiver is used to receive real GNSS signals, obtain navigation and positioning information based on the real GNSS signals, and send the navigation and positioning information to the industrial control computer; The main control device, an atomic clock, is used to provide an external time base and external frequency standard for the industrial control computer.

4. The device according to claim 1, characterized in that, The time difference between the local atomic clock and the main control device atomic clock is calculated using the following formula: in, This is the time difference between the local atomic clock and the main control device's atomic clock, specifically the time difference between the distributed signal generation device of the i-th node and the main control device. Let be the pseudorange between the distributed signal generation device and the main control device at the i-th node. Let be the pseudorange of the time synchronization and communication signal received by the distributed signal generation device of the i-th node. It is the speed of light.

5. A method for controlling the distributed GNSS timing covert deception device according to any one of claims 1-4, characterized in that, include: The target detection device sends the target location information to the main control device; The main control device receives the target location information, determines a deception strategy based on 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 generation device. The distributed signal generation 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 main control device atomic clock, obtains the time difference and parameter instructions, obtains a deception signal based on the time difference and parameter instructions and the navigation and positioning information, obtains a signal transmission module control instruction based on the target location information, and sends the deception signal and the signal transmission module control instruction to the signal transmission module. The signal transmitting module receives the signal transmitting module control command and the deception signal, and transmits the deception signal through the servo antenna; The distributed signal generation 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 main control device atomic clock; obtains the time difference and parameter instructions; generates a deception signal based on the time difference and parameter instructions and the navigation and positioning information; and obtains a signal transmission module control instruction based on the target location information. It then sends the deception 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 main control device atomic clock, obtains the time difference and parameter instructions, and sends the time difference and parameter instructions to the baseband signal generation module. The satellite receiver receives real GNSS signals, obtains navigation and positioning information based on the real GNSS signals, and sends the navigation and positioning information to the baseband signal generation module; The baseband signal generation module receives the target location information, the time difference and parameter instructions, and the navigation and positioning information. Based on the target location information, it determines the transmit signal power and servo antenna angle, obtains the signal transmission module control instructions, calibrates the local time based on the time difference and parameter instructions, obtains the time deception baseband signal based on the time difference and parameter instructions and the navigation and positioning information, sends the signal transmission module control instructions to the signal transmission module, and sends the time deception baseband signal to the radio frequency module. The radio frequency module receives the time deception baseband signal, converts the frequency of the time deception baseband signal to obtain a deception signal, and sends the deception signal to the signal transmitting module. The atomic clock provides an external time base and external frequency standard for the baseband signal generation module; The transmitted signal power is calculated using the following formula: in, The transmitted signal power refers to the transmitted signal power that the distributed signal generator of the i-th node needs to control for the servo antenna. For the signal attenuation from the i-th node to the target, Let be the power of the actual GNSS signal received by the satellite receiver at the i-th node. Let be the frequency of the deception signal of the i-th node. Let be the spatial distance between the i-th node and the target. Let be the coordinates of the distributed signal generator at the i-th node. For the target coordinates, The horizontal angle, elevation angle, and distance between the target and the main control equipment are measured by the target detection equipment. The latitude, longitude, and altitude of the main control equipment are measured by the satellite receiver of the main control equipment. The sum of power compensation, the difference in real signals at different locations, and the power advantage required for deceptive signal insertion is 1-3 dBm.

6. The method according to claim 5, characterized in that, The servo antenna angle is calculated using the following formula: in, , The angle of the servo antenna. The distributed signal generating device at the i-th node needs to control the horizontal angle of the servo antenna aligned with the target. The distributed signal generator at the i-th node needs to control the elevation angle of the servo antenna aimed at the target. Let be the coordinates of the distributed signal generator at the i-th node. The horizontal angle, elevation angle, and distance between the target and the main control equipment are measured by the target detection equipment. For the target coordinates, The latitude, longitude, and altitude of the main control equipment are measured by the satellite receiver of the main control equipment.

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