A large dynamic millimeter wave multi-purpose radar jamming simulation device and a control method thereof

Abstract

This invention discloses a high-dynamic-range millimeter-wave multi-purpose radar jamming simulation device and its control method, relating to the field of radar electronic countermeasures technology. The device includes an antenna array, a radar jamming simulation system host, and an RF power amplifier module. The host integrates a signal generation unit, a main control processing unit, microwave frequency converters, and RF switches. This invention achieves automated channel switching between a first branch with power amplifier and a second branch without power amplifier by setting a preset power threshold. Combined with a segmented traversal of attenuation codes, it establishes raw data tables for the two branches, ultimately synthesizing a full dynamic range output power calibration table based on a threshold for use by the main control module. This invention achieves high-precision dynamic output greater than 90dB. Simultaneously, the device employs a partitioned heat dissipation structure and a simplified cable interface, exhibiting high modularity and perfectly meeting the flexible deployment requirements of multiple platforms, including airborne, UAV, and ground-based systems.

Description

Technical Field

[0001] This invention belongs to the field of radar electronic countermeasures technology, and specifically relates to a high dynamic millimeter-wave multi-purpose radar jamming simulation device and its control method. Background Technology

[0002] In the context of electronic warfare in the millimeter-wave band, millimeter-wave radar jamming simulation systems are needed to conduct simulation experiments on ground, air-to-ground, and air-to-air scenarios. To meet the needs of different scenarios, jamming simulation equipment needs to possess multiple suppression and deception jamming strategies to construct an electronic warfare training and testing environment that closely resembles real combat.

[0003] In the context of all-domain operations, millimeter-wave radar jamming simulation equipment with the same technical status needs to meet the installation requirements of multiple platforms. That is, a device that is suitable for airborne installation, UAV hoisting, ground erection and laboratory testing is needed. The overall development of the equipment is towards miniaturization, lightweighting, portability and simplification.

[0004] To accurately reconstruct and modulate target and interference signals in real-world radar echo and jamming scenarios, radar jamming simulation equipment needs to meet high output dynamic range and high output accuracy. However, the power consumption, transmit power, and output dynamic range of jamming simulation equipment are typically mutually restrictive. Limited by link attenuation control, simultaneously ensuring good signal quality at both low and high power levels under high output dynamic range is extremely difficult. Under current power consumption requirements, the dynamic range requirement for jamming simulation equipment in the industry is typically around 60dB; and when microwave frequency conversion attenuation is fully applied (typically effective attenuation dynamic range is around 55dB), errors exist at each attenuation point, leading to poor signal quality when signal power attenuation reaches its maximum. Simultaneously, due to the operating characteristics of power amplifier chips, spurious levels increase as input power decreases when the signal operates in the linear region, further deteriorating signal quality at low power output. Furthermore, existing jamming simulation equipment on the market is usually only suitable for a single application scenario, making it difficult to achieve multi-scenario compatibility and rapid deployment and withdrawal. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to address the shortcomings of existing technologies by providing a high dynamic range millimeter-wave multi-purpose radar interference simulation device and its control method, in order to solve the problems of small dynamic range, poor signal quality at low power output, and difficulty in adapting to flexible deployment on multiple platforms in existing devices.

[0006] Technical solution: The large dynamic range millimeter wave multi-purpose radar interference simulation device provided by the present invention includes an antenna group, a radar interference simulation system host, and an RF power amplifier module;

[0007] The radar interference simulation system host integrates at least a signal generation and main control processing unit, a microwave frequency conversion module and a radio frequency switch module. The signal generation and main control processing unit includes a signal generation unit and a main control processing unit.

[0008] The microwave frequency conversion module is used for up-conversion and down-conversion processing of radio frequency signals and power attenuation control.

[0009] The input terminal of the RF switch module is connected to the RF output terminal of the microwave frequency conversion module. The output terminal of the RF switch module is provided with a first branch and a second branch. The first branch is connected to the RF power amplifier module for high-power transmission, and the second branch is used for low-power direct transmission without going through the RF power amplifier module.

[0010] The main control processing unit is connected to the signal generation unit, the microwave frequency conversion module, the radio frequency power amplification module, and the radio frequency switch module. It is used to control the radio frequency switch module to switch between the first branch and the second branch according to the set target output power, and to control the attenuation of the microwave frequency conversion module and the radio frequency power amplification module in conjunction with a preset synthesized code word table, so as to realize the large dynamic range output of the device in the millimeter wave operating frequency band.

[0011] This invention also provides an output control method for large dynamic range millimeter-wave radar jamming signals, applied to the aforementioned device, comprising the following steps:

[0012] Step 1, Attenuation calibration: Control the RF switch module to select the first branch and the second branch respectively, and sequentially traverse all attenuation control code word combinations of the modules involved in each branch. Measure and record the actual output power value corresponding to each code word combination, and generate the first original power data table for the first branch and the second original power data table for the second branch respectively.

[0013] Step 2, data merging: Select a preset power boundary point, extract the data segments in the first original power data table whose output power is greater than or equal to the preset power boundary point, and extract the data segments in the second original power data table whose output power is less than the preset power boundary point. Then, concatenate the two data segments to generate a continuous synthesized codeword table that covers the global output dynamic range.

[0014] Step 3, Pre-operation switching: In the parameter setting stage before the device enters the interference signal transmission working state, the set target output power value is received, the target branch and target attenuation codeword are determined by querying the continuous synthesized codeword table, and the radio frequency switch module is controlled to switch to the target physical branch and complete the attenuation configuration of each module.

[0015] Step 4, Precise Output: Based on the synthesized codeword table, the corresponding target attenuation codeword is called, and the attenuation control unit of the microwave frequency conversion module and the radio frequency power amplifier module are linked to achieve continuous and precise power output.

[0016] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows:

[0017] This invention introduces an RF switch module at the RF output of the microwave frequency converter module, dividing the transmission link into a first branch (high-power branch) that passes through the RF power amplifier module and a second branch (low-power branch) that does not pass through the RF power amplifier module. The main control module automatically switches branches. When low-power output is required, the signal bypasses the power amplifier chip and is output directly, thus avoiding the problem of spurious level deterioration of the power amplifier chip during deep attenuation. It also avoids the adverse effects of attenuation codeword superposition error of the microwave frequency converter module on signal quality during extreme attenuation. Actual measurements have verified that the actual effective output dynamic range of this invention in the 32-38GHz operating frequency band is greater than 93.45dB, which is more than 30dB higher than the approximately 60dB dynamic range of similar products in the industry, providing more output power options for scenario simulation.

[0018] This invention performs point-by-point calibration on the 6-bit attenuation control unit (1dB, 2dB, 4dB, 8dB, 16dB, 30dB) of the microwave frequency converter module and the built-in 20dB fixed attenuation of the power amplifier module. Original power calibration data tables for the first and second branches are established separately. Using a preset power threshold (-10dBm), the two data tables are combined into a single dynamic attenuation calibration table covering the entire dynamic range. This method eliminates the impact of accumulated errors at different attenuation levels on step accuracy, ensuring a 1dB attenuation step across the entire dynamic range with a step error of less than 0.5dB, achieving precise and continuous power control.

[0019] Since the switching of high and low power branches occurs before each interference mission begins (i.e., the switching is completed once before use according to the set output power), there is no need to switch branches in real time during the entire mission execution. Therefore, transient glitches, phase jumps or time delays will not be introduced into the signal link, ensuring the continuity and stability of the interference signal throughout the mission.

[0020] This invention configures the radar interference simulation system host, RF power amplifier module, and antenna group as three independent modular physical units. The external electrical cable interfaces consist of only five types: power supply line, data control line, power amplifier power supply and control line, RF input cable, and two RF output cables. The host base is designed with four universal fixing screw slots, allowing for flexible adaptation to various installation methods such as tripod ground mounting, UAV hoisting, and UAV nose mounting by simply changing the adapter plate. The same equipment enables seamless switching between laboratory, ground, and airborne scenarios, significantly reducing installation complexity and improving equipment utilization.

[0021] This invention adopts a partitioned heat dissipation structure layout, arranging the main control module, digital processing module, and microwave frequency conversion module, which generate a large amount of heat, on the upper and lower sides of the heat dissipation air duct. Their core heat-generating areas are directly attached to the heat dissipation components with heat dissipation teeth to ensure efficient heat conduction. At the same time, non-primary heat-generating modules such as the DC-DC power module, low-noise amplifier module, and communication isolation module are embedded in the accommodating cavity reserved at the base of the heat dissipation teeth, making full use of the internal space. This significantly improves the system integration while ensuring the thermal stability of the whole machine under various working environments.

[0022] This invention introduces a communication isolation module into the serial communication link to implement electrical isolation for serial communication, effectively suppressing common-mode interference and differential-mode interference caused by ground potential differences between different devices, preventing damage to the chip due to surges or high voltages conducted through the serial line, and enhancing the device's adaptability and communication reliability in complex electromagnetic environments. Attached Figure Description

[0023] Figure 1 This is a block diagram of the overall composition of the large dynamic millimeter-wave multi-purpose radar interference simulation device of the present invention. It shows the three main components: antenna group, radar interference simulation system host, and radio frequency power amplifier module, as well as the connection relationship between the various functional modules inside the host (signal generation and main control processing unit, switching module, microwave frequency conversion module, low noise amplifier module, DC-DC voltage regulator module) and the dual-branch structure of the transmission link.

[0024] Figure 2 This is a flowchart of the signal processing of the radar interference simulation device of the present invention. It shows the complete signal processing link after the received signal is sequentially subjected to amplitude limiting amplification, down-conversion processing, signal sorting and intermediate frequency generation, up-conversion processing, transmission branch selection and power amplification before transmission, as well as the low-power direct transmission branch.

[0025] Figure 3 This is a schematic diagram of the external structure of the radar interference simulation system host of the present invention. It shows that the host base has four universal fixing screw slots and a fixing flange, and the structure is adapted to be used for tripod mounting after being assembled with the adapter plate.

[0026] Figure 4 This is a schematic diagram of the installation of the radar interference simulation equipment of the present invention adapted to an unmanned rotorcraft, showing the installation method of the equipment being hoisted onto the belly of the unmanned rotorcraft by tooling structural components.

[0027] Figure 5 This is a schematic diagram of the installation of the radar interference simulation equipment of the present invention adapted to the nose of an unmanned jet aircraft, showing the structural form of the equipment installed inside the nose fairing of the unmanned jet aircraft.

[0028] Figure 6 The flowchart for attenuation accuracy calibration of this invention illustrates the calibration process of traversing 128-bit attenuation codewords and completing data table synthesis for two RF output channels.

[0029] Figure 7 This is a schematic diagram (top view) of the internal module layout of the radar interference simulation system host of the present invention, showing the arrangement of the communication and power supply interface, switch module, main control module, digital processing module, and microwave frequency conversion module inside the host, as well as the heat dissipation duct structure.

[0030] Figure 8 This is a schematic diagram of the internal module layout of the radar interference simulation system host of the present invention (lower view), showing the structural layout in which the cooling fan, DC-DC power supply module, low noise amplifier module and communication isolation module are embedded in the heat dissipation tooth base cavity.

[0031] Figure 9 This is a block diagram of the injection-type test in this invention. Detailed Implementation

[0032] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments described.

[0033] Example 1: This example provides a high dynamic range millimeter-wave airborne and ground-based dual-use radar jamming simulation device, operating in the 32-38 GHz millimeter-wave band. It mainly consists of three parts: an antenna array, a radar jamming simulation system host, and an RF power amplifier module. The three units are connected via an adapter board and standardized electrical cable interfaces, supporting separate or freely combinable installation. The antenna and power amplifier can be freely combined according to the usage scenario and power requirements.

[0034] (a) Antenna Group

[0035] The antenna group includes at least one receiving antenna and two transmitting antennas. In this embodiment, antenna group 1 is divided into two types: linearly polarized antenna group and circularly polarized antenna group, to meet the experimental requirements of different polarization methods: the linearly polarized antenna group supports horizontal or vertical polarization; the circularly polarized antenna group supports left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) switching, and the polarization method and antenna beam coverage angle can be manually adjusted according to the actual experimental scenario to achieve better experimental results. Specifically, it is configured with one receiving antenna and two transmitting antennas, corresponding to one RF input port and two RF output ports of the host, respectively.

[0036] (ii) Main unit of radar jamming simulation system

[0037] The radar interference simulation system host is the core module of this equipment, integrating a signal generation and main control processing unit 2 (including a signal generation unit and a main control processing unit), a microwave frequency conversion module 3, a communication isolation module 4, a low-noise amplifier module 5, an RF switch module 6, a DC-DC voltage regulator module 7, and an RF power amplifier module 8. The functional modules are described below:

[0038] 1. Signal Generation Unit: The signal generation unit receives parameters from the main control module and generates baseband target simulation signals (radar simulation signals) and jamming signals. This unit can distinguish the received intermediate frequency signals and modulate the phase and amplitude of the output signal according to preset rules to achieve various jamming output patterns. Supported noise patterns include: broadband noise, narrowband targeting, comb spectrum, intermittent noise, and cluttered pulses; supported deception patterns include: dense false targets, random false targets, dragging jamming, and Doppler scintillation.

[0039] 2. Main Control Processing Unit: As the control core of the entire system, it is responsible for coordinating the working status of the control signal generation unit, microwave frequency conversion module, low noise amplifier module, communication isolation module, RF switch module and external RF power amplifier module, and for exchanging information and receiving and executing control commands with the external platform (host computer or display and control software) through the communication isolation module.

[0040] 3. Microwave Frequency Conversion Module: The microwave frequency conversion module performs up-conversion and down-conversion of the radio frequency signal, detects the input signal, and implements fine attenuation control of the output power of the radio frequency signal. The module's radio frequency output integrates a 6-bit attenuation control unit, with each bit weighted at 1dB, 2dB, 4dB, 8dB, 16dB, and 30dB. Theoretically, by combining these attenuation codewords, it can provide an attenuation dynamic range of 0~61dB.

[0041] 4. Low-noise amplifier module: The low-noise amplifier module is responsible for limiting and amplifying the radio frequency signal received by the antenna with low noise. While protecting the downstream links from damage by strong signals, it reduces the overall noise figure of the system and improves the sensitivity of receiving weak signals.

[0042] 5. RF Switch Module: The RF switch module is connected to the RF output terminal of the microwave frequency converter module. Under the control of the main control module, it realizes the switching between the high-power branch (via the RF power amplifier module) and the low-power branch (direct output). It is the core actuator for realizing large dynamic output.

[0043] 6. DC-DC power supply module: The DC-DC power supply module performs voltage regulation and transformation on the external power input, providing the required operating voltage for each functional module in the host, and ensuring that the system operates stably within a wide input voltage range.

[0044] 7. Communication Isolation Module: The communication isolation module implements electrical isolation in the serial communication link, cutting off the common-mode current path formed by ground potential differences between different devices. It also suppresses differential-mode interference, preventing surges and noise from damaging the communication chip through the serial line, ensuring the accuracy of serial data transmission and the stable operation of the device in complex electromagnetic environments. The isolation medium inside the communication isolation module is a pair of differential isolation capacitors, which can withstand high voltage differences, block DC current and ground loop current, and improve the chip's common-mode rejection capability. Based on the principle of capacitive voltage division, changes in the input power supply are directly coupled to the other side of the isolation capacitor, generating a corresponding voltage change. The output detection circuit identifies this voltage change and reconstructs the digital signal. This design features a simple architecture, strong anti-interference capability, and low transmission delay.

[0045] (III) Radio Frequency Power Amplification Module

[0046] The RF power amplifier module is an external, independent unit that connects to the radar interference simulation system host via a standardized interface. In this embodiment, the power amplifier module has a maximum output power of 43dBm and a built-in 20dB fixed attenuation (corresponding to a 1-bit attenuation codeword) to control the power amplifier's operating point. When the RF switch module selects the first branch (high-power branch), the RF signal output from the microwave frequency converter module is amplified by the power amplifier module and output, achieving a maximum high-power transmission of 43dBm.

[0047] Example 2: Large Dynamic Output Control Method

[0048] like Figure 2 As shown in the figure, this embodiment describes in detail the output control method and its implementation logic for large dynamic range millimeter-wave radar interference signals.

[0049] Large dynamic range control faces two main technical constraints: First, the operating characteristics of the power amplifier chip limit the signal quality of the power amplifier link at low power output—when the input power is low, the chip enters a deep linear region, and the spurious level increases as the input power decreases, affecting signal purity; second, there is the constraint of attenuation accuracy of the microwave frequency conversion module—due to the inherent error of each attenuation bit, the actual effective attenuation dynamic range of the module is approximately 55dB after the sum of each error, and the attenuation cannot be increased indefinitely. Based on the above constraints, this invention achieves large dynamic range precise control through the following four steps:

[0050] Step 1: Define the output range control logic.

[0051] The preset power threshold is set to -10dBm (this value is determined by comprehensively considering the linear operating boundary of the power amplifier chip and the 55dB maximum effective attenuation accuracy of the microwave frequency converter module). When the signal is output from the microwave frequency converter module and enters the RF switch module: if the required output power is greater than or equal to -10dBm (high power range: 43~-10dBm), the main control module automatically controls the RF switch module to select the first branch that passes through the RF power amplifier module; if the required output power is less than -10dBm (low power range: -10~-55dBm), the main control module automatically controls the RF switch module to select the second branch that outputs directly, and the signal does not pass through the power amplifier module, thus completely avoiding the spurious degradation problem of the power amplifier when the signal is small.

[0052] Step 2: Create the original power calibration data table.

[0053] like Figure 6 As shown, attenuation accuracy calibration is performed on the first branch (power amplifier channel) and the second branch (microwave channel) respectively. Taking a certain operating frequency (e.g., 33GHz) as an example, the calibration process is as follows: Select RF output channel i (i=1 or 2), and traverse the attenuation code j of the microwave frequency converter module from 0 to 128 (a total of 128 attenuation code word combinations) in steps of 4 (code word quantity), recording the actual output power of the device under each code word combination; after completing the traversal of channel i, switch to another channel and repeat the above traversal process. After calibrating both RF output channels, the original data table of the first branch (power amplifier channel attenuation calibration table) and the original data table of the second branch (microwave channel attenuation calibration table) can be obtained. Taking the 33GHz frequency as an example, the power coverage range in the first branch data table is approximately 43.384dBm to -19.163dBm, and the power coverage range in the second branch data table is approximately -2.56dBm to -43.673dBm.

[0054] Table 1: Power Amplifier Channel Attenuation Calibration Table

[0055]

[0056] Table 2: Microwave Channel Attenuation Calibration Table

[0057]

[0058] Step 3: Synthesize the output power dynamic attenuation calibration table.

[0059] Using -10dBm as the preset power cutoff point, data points with output power greater than or equal to -10dBm (i.e., the higher power portion of the power amplifier channel, corresponding to codewords from 0 to approximately 212) are extracted from the original data table of the first branch to form the upper half of the composite table. Data points with output power less than -10dBm (i.e., the lower power portion of the microwave channel, corresponding to codewords from approximately 92 to 252) are extracted from the original data table of the second branch to form the lower half of the composite table. The two sets of data are merged in descending order of power to generate an output power dynamic attenuation calibration table covering the entire dynamic range (approximately 43dBm to above -43dBm). At the splicing point (around -10dBm), the data points closest to -10dBm in the two original tables are selected for connection, ensuring a smooth transition and power monotonicity of the composite table at the cutoff point.

[0060] Taking 33GHz as an example, as shown in Tables 1 and 2, the attenuation codeword corresponding to the power amplifier channel at -10dBm is 212, and the attenuation codeword corresponding to the microwave channel at -10dBm is 92. The synthesized calibration table starts from codeword 0 (corresponding to power 43.384dBm), decreases through the power amplifier channel codeword sequence to codeword 212 (corresponding to -10.125dBm), then seamlessly switches to the microwave channel codeword 92 (corresponding to -9.973dBm), and continues to monotonically increase along the microwave channel attenuation codeword until codeword 252 (corresponding to -43.673dBm), achieving continuous seamless coverage across the entire dynamic range. The synthesized effect is shown in Table 3.

[0061] Table 3: Power Dynamic Attenuation Calibration Table

[0062]

[0063] Step 4: Automatic switching and precise output.

[0064] In practical use, the main control module receives the power attenuation setting value from the host computer or display and control software. Based on the synthesized full dynamic range output power dynamic attenuation calibration table, it automatically looks up the corresponding attenuation codeword combination and its branch, and then automatically controls the RF switch module to switch to the corresponding branch (first branch or second branch). Simultaneously, it controls the state of each attenuation bit of the microwave frequency converter module to achieve precise power output. In actual use, each adjustment of the attenuation value requires reloading the parameters. Since the branch switching is completed once before each task begins, there is no dynamic switching during task execution, achieving 1dB step smooth attenuation control. No transient glitches, phase jumps, or time delays occur in the signal link, ensuring the continuity and stability of the interference signal output.

[0065] Example 3: Modular Installation and Platform Adaptation

[0066] like Figure 3 , Figure 4 , Figure 5 As shown, this embodiment describes the modular installation design and multi-platform adaptation implementation of the device.

[0067] The radar jamming simulation system's main unit has undergone a significant simplification of its external electrical cabling interfaces, including only five types: one power supply interface (providing power to the main unit), one external data control interface (for communication with the host computer or display and control software), one power amplifier power supply and control interface (powering the RF power amplifier module and transmitting control commands), one RF input cable interface (connecting to the receiving antenna), and two RF output cable interfaces (connecting to the two transmitting antennas respectively). This simplified interface design significantly reduces the complexity of disassembly and assembly when switching between different platforms.

[0068] like Figure 3 As shown, in ground-based applications, the main unit base is designed with four universal fixing screw slots, which can be assembled with a standard adapter plate and mounted on a tripod, or placed directly on a table for laboratory testing.

[0069] like Figure 4 As shown, in the application scenario of unmanned rotorcraft, the equipment can be simply assembled using tooling structural components and hoisted under the fuselage of the unmanned rotorcraft to meet the requirements of low-altitude interference simulation missions.

[0070] like Figure 5 As shown, in the scenario of using unmanned jet aircraft, the equipment can be installed inside the nose fairing of the unmanned jet aircraft through tooling structural components to achieve the transmission of interference signals in the forward direction of the nose.

[0071] The aforementioned multi-mode installation and switching involves only the recombination of three components: the main unit, the power amplifier, and the antenna, as well as the replacement of the adapter board. Installation is simple and allows for rapid scenario switching, meeting the need for cross-platform use of the same equipment in all-domain combat scenarios. The equipment has undergone vibration and shock, environmental adaptability, and electromagnetic compatibility testing in accordance with national military standards, demonstrating its stable operation under various conditions.

[0072] Example 4: Internal Structure and Heat Dissipation Design

[0073] like Figure 7 , Figure 8 As shown, this embodiment describes the module layout and heat dissipation design inside the radar interference simulation system host.

[0074] The internal cooling system of the main unit employs a partitioned heat dissipation layout. Figure 7 As shown from the top view, the host has a longitudinally running heat dissipation duct, with a cooling fan positioned at one end to provide forced convection airflow. The main heat-generating modules—the main control module, digital processing module, and microwave frequency conversion module—are located on the upper and lower sides of the heat dissipation duct, respectively. The core heat-generating area of ​​each module (i.e., the chip packaging surface) is directly bonded to the heat dissipation components with heat dissipation fins. Efficient heat conduction is achieved through the thermal interface material, and the heat dissipation fins diffuse the heat into the airflow of the duct and carry it away.

[0075] like Figure 8 As shown in the diagram, from a lower perspective, non-primary heat-generating modules such as the DC-DC power supply module, low-noise amplifier module, and communication isolation module are embedded in the accommodating cavity reserved at the base of the heat sink fins. This design makes full use of the space between the heat sink fins, significantly improving internal integration without increasing the overall size of the host. At the same time, since these non-primary heat-generating modules generate relatively little heat, their arrangement at the base of the heat sink fins also provides them with sufficient passive cooling capacity.

[0076] The aforementioned partitioned heat dissipation structure design enables differentiated thermal management of modules with different thermal power consumption levels within a compact chassis volume, ensuring the thermal stability of the entire machine under continuous operating conditions. It is one of the key supporting technologies for achieving the miniaturization, lightweight, and high integration design goals of this invention.

[0077] Example 5: Testing and Technical Specification Verification

[0078] refer to Figure 9 Connect the equipment and instruments provided in Example 1, and perform output dynamic range and output power step accuracy tests in accordance with the relevant provisions of GJB 5669-2006.

[0079] (a) Output dynamic range test

[0080] At seven frequency points (32GHz, 33GHz, 34GHz, 35GHz, 36GHz, 37GHz, and 38GHz) within the 32-38GHz band, the maximum / minimum output power of continuous wave and pulsed wave was measured respectively. The smaller value between the dynamic range of continuous wave and pulsed wave was taken as the output dynamic range of that frequency point. The specific process is as follows:

[0081] a) Power on and preheat the equipment and instruments, and adjust them to ensure they are working properly;

[0082] b) Set the output signal frequency of the signal source to... 1000 cycles Pulse width 1 Output power -55dBm;

[0083] c) Set the center frequency of the spectrum analyzer to... 1GHz bandwidth;

[0084] d) Display and control software parameter settings: Open style parameter editing, and set power attenuation to 0dB and 90dB;

[0085] e) Click the "Start" command in the display and control software;

[0086] f) Observe the spectrum analyzer to read the maximum interference signal power of the continuous wave output. and minimum interference signal power ;

[0087] g) Set the center frequency of the spectrum analyzer to... Set the sweep width to 0 GHz, connect the signal source's "TRIG1" and the spectrum analyzer's "TRIGGERIN1", and set the spectrum analyzer's trigger mode to "external 1".

[0088] h) Open the style parameter editor and set the power attenuation to 0dB and 90dB;

[0089] i) Click the "Start" command in the display and control software;

[0090] j) Observe the spectrum analyzer to read the maximum interference signal power of the pulse wave output. and minimum interference signal power ;

[0091] k) Change the parameters and repeat b) ~ j), and record the test results.

[0092] Record the test results in the output dynamic range test table and perform the following data processing:

[0093] Calculate according to the formula and :

[0094] =

[0095] =

[0096] In the formula:

[0097] —Actual maximum output power of continuous wave, dBm;

[0098] —Actual minimum output power of continuous wave, dBm;

[0099] —Continuous wave output dynamic range, dB;

[0100] —Actual maximum output power of the pulse wave, dBm;

[0101] —Actual minimum output power of pulse wave, dBm;

[0102] —Dynamic range of pulse wave output, dB.

[0103] from , The minimum value selected is the output dynamic range. As shown in Table 4. Acceptance criterion: If the output dynamic range meets the following conditions... If the result is satisfactory, then the indicator is deemed qualified.

[0104] Table 4: Output Dynamic Range Test Table

[0105]

[0106] Test results show that the output dynamic range at each frequency point is greater than 93dB, and the minimum output dynamic range across the entire frequency band is ( The output voltage was 93.45 dB, which meets the design requirement of greater than 90 dB, verifying the effectiveness of the large dynamic output control method of the present invention.

[0107] (ii) Output power step accuracy test

[0108] At three frequency points of 32.5GHz, 35.5GHz, and 37.5GHz, the step accuracy (continuous wave and pulse wave) of the two RF output ports was tested at typical attenuation values ​​of 0dB, 1dB, 30dB, 31dB and 89dB / 81dB, 90dB, respectively. The specific process is as follows:

[0109] a) Power on and preheat the equipment and instruments, and adjust them to ensure they are working properly;

[0110] b) Set the output signal frequency of the signal source to... 1000μs cycle time, 1μs pulse width, -55dBm output power;

[0111] c) Set the center frequency of the spectrum analyzer to... 1GHz bandwidth;

[0112] d) Display and control software parameters: Open the style parameter editor, and set the power attenuation to... ;

[0113] e) Click the "Start" command in the display and control software;

[0114] f) Observe the spectrum analyzer to read the continuous wave output power. Starting from 0dB, change the power attenuation according to the minimum attenuation step specified in the product specification and test 3 sets of data;

[0115] g) Set the center frequency of the spectrum analyzer to... Set the sweep width to 0 GHz, connect the signal source's "TRIG1" and the spectrum analyzer's "TRIGGER IN1", and set the spectrum analyzer's trigger mode to "external 1".

[0116] h) Open the style parameter editor, and set the power attenuation to... ;

[0117] i) Click the "Start" command in the display and control software;

[0118] j) Observe the spectrum analyzer to read the pulse wave output power. Starting from 0dB, change the power attenuation according to the minimum attenuation step specified in the product specification and test 3 sets of data;

[0119] k) Change the parameters and repeat b) ~ j), and record the test results.

[0120] Record the test results in the output power step test table and perform the following data processing:

[0121] Calculate according to the formula , and :

[0122] =

[0123] =

[0124] =

[0125] =

[0126] In the formula: n is Power step difference. In the output power step test table, n=1. It is used to check whether the power attenuation step meets the requirements. The values ​​can be 1-0, 31-30, 90-89, etc.

[0127] —Actual continuous wave output power, dBm;

[0128] —Continuous wave power step, dB;

[0129] —Continuous wave step accuracy, dB;

[0130] —Actual pulse wave output power, dBm;

[0131] —Pulse wave power step, dB;

[0132] —Maximum power step, dB;

[0133] —Pulse wave step accuracy, dB.

[0134] from , The maximum value selected is the output power step accuracy. As shown in Table 5, if the output power step satisfies If the result is satisfactory, then the indicator is deemed qualified.

[0135] Table 5: Output Power Step Test Table

[0136]

[0137] Test results show that the maximum output power step error across the entire frequency band and dynamic range is ( The step error is 0.78dB, which meets the design requirement of less than 1dB, and the design goal of less than 0.5dB is fully verified.

[0138] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A high dynamic range millimeter-wave multi-purpose radar jamming simulation device, characterized in that, Includes antenna array, radar interference simulation system main unit, and radio frequency power amplifier module; The radar interference simulation system host integrates at least a signal generation and main control processing unit, a microwave frequency conversion module and a radio frequency switch module. The signal generation and main control processing unit includes a signal generation unit and a main control processing unit. The microwave frequency conversion module is used for up-conversion and down-conversion processing of radio frequency signals and power attenuation control. The input terminal of the RF switch module is connected to the RF output terminal of the microwave frequency conversion module. The output terminal of the RF switch module is provided with a first branch and a second branch. The first branch is connected to the RF power amplifier module for high-power transmission, and the second branch is used for low-power direct transmission without going through the RF power amplifier module. The main control processing unit is connected to the signal generation unit, the microwave frequency conversion module, the radio frequency power amplification module, and the radio frequency switch module. It is used to control the radio frequency switch module to switch between the first branch and the second branch according to the set target output power, and to control the attenuation of the microwave frequency conversion module and the radio frequency power amplification module in conjunction with a preset synthesized code word table, so as to realize the large dynamic range output of the device in the millimeter wave operating frequency band.

2. The high dynamic range millimeter-wave multi-purpose radar interference simulation device according to claim 1, characterized in that, The preset synthesized codeword table is a global continuous power mapping table synthesized by splicing the first original power data obtained from the power attenuation traversal test for the first branch and the second original power data obtained from the power attenuation traversal test for the second branch at a preset power boundary point.

3. The large dynamic millimeter-wave multi-purpose radar interference simulation device according to claim 2, characterized in that: The preset power threshold value ranges from -5dBm to -15dBm. The main control processing unit is used to: when the set target output power is greater than or equal to the preset power threshold, control the RF switch module to turn on the first branch, and call the corresponding first attenuation codeword according to the synthesized codeword table to control the RF power amplifier module and the microwave frequency converter module in conjunction; when the set target output power is less than the preset power threshold, control the RF switch module to turn on the second branch, and call the corresponding second attenuation codeword according to the synthesized codeword table to control only the microwave frequency converter module.

4. The high dynamic range millimeter-wave multi-purpose radar interference simulation device according to claim 3, characterized in that, The main control processing unit adopts static timing configuration logic, which limits the branch switching action of the radio frequency switch module and the configuration action of the attenuation codeword of each module to the parameter setting stage before the device starts to perform interference transmission. After the device enters the interference signal transmission working state, the main control processing unit locks the current physical branch state to avoid transient glitches and phase jumps during operation.

5. The high dynamic range millimeter-wave multi-purpose radar interference simulation device according to claim 1, characterized in that, The microwave frequency conversion module includes six attenuation control bits: 1dB, 2dB, 4dB, 8dB, 16dB, and 30dB. The RF power amplifier module has a built-in 20dB fixed attenuation unit. The main control module controls the combination of the above seven attenuation code words and, in conjunction with the switching of the first branch and the second branch, achieves continuous output control with an attenuation step of 1dB and a step error of less than 0.5dB within the dynamic range of the device output.

6. The large dynamic millimeter-wave multi-purpose radar interference simulation device according to claim 1, characterized in that, The radar interference simulation system host also integrates a low-noise amplifier module, a communication isolation module, and a DC-DC power supply module. The low-noise amplifier module is used to limit and amplify the received signal with low noise. The communication isolation module is used for electrical isolation in serial communication links with external platforms; The signal generation unit receives parameters from the main control processing unit to generate baseband target analog signals and interference signals, and modulates the phase and amplitude of the output signals according to preset rules. The preset rules include noise pattern rules covering broadband noise, narrowband aiming, comb spectrum, intermittent noise and cluttered pulses, as well as deception rules covering dense false targets, random false targets, drag interference and Doppler flicker.

7. The high dynamic range millimeter-wave multi-purpose radar interference simulation device according to claim 4, characterized in that, The radar interference simulation system adopts a graded heat dissipation structure inside the host. The signal generation and main control processing unit and microwave frequency conversion module, which generate more heat, are arranged close to both sides of the heat dissipation duct as key heat dissipation areas, while the other modules with less heat are embedded in the reserved space inside the equipment. The base of the radar interference simulation system host is equipped with a fixed interface, which can be disassembled and assembled by adapting to unmanned fixed-wing aircraft, unmanned rotorcraft or tripod through the adapter plate assembly.

8. The high dynamic range millimeter-wave multi-purpose radar jamming simulation device according to claim 1 or 3, characterized in that, The microwave frequency conversion module integrates multiple attenuation control bits to provide microwave attenuation dynamics. The main control processing unit combines the upper limit of power amplification of the first branch with the lower limit of low power output of the second branch achieved by the attenuation control bits, and achieves a continuous and smooth transition across branches through the synthesized codeword table, so that the dynamic range of the whole machine output in the 32-38GHz operating frequency band is not less than 93dB.

9. The large dynamic millimeter-wave multi-purpose radar interference simulation device according to claim 1, characterized in that: The antenna group includes one receiving antenna and two transmitting antennas, wherein the two transmitting antennas are respectively connected to the first branch and the second branch of the radio frequency switch module to transmit high-power signals and low-power signals respectively.

10. A method for outputting large dynamic range millimeter-wave radar jamming signals, applied to the large dynamic range millimeter-wave multi-purpose radar jamming simulation equipment as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1, Attenuation calibration: Control the RF switch module to select the first branch and the second branch respectively, and sequentially traverse all attenuation control code word combinations of the modules involved in each branch. Measure and record the actual output power value corresponding to each code word combination, and generate the first original power data table for the first branch and the second original power data table for the second branch respectively. Step 2, data merging: Select a preset power boundary point, extract the data segments in the first original power data table whose output power is greater than or equal to the preset power boundary point, and extract the data segments in the second original power data table whose output power is less than the preset power boundary point. Then, concatenate the two data segments to generate a continuous synthesized codeword table that covers the global output dynamic range. Step 3, Pre-operation switching: In the parameter setting stage before the device enters the interference signal transmission working state, the set target output power value is received, the target branch and target attenuation codeword are determined by querying the continuous synthesized codeword table, and the radio frequency switch module is controlled to switch to the target physical branch and complete the attenuation configuration of each module. Step 4, Precise Output: Based on the synthesized codeword table, the corresponding target attenuation codeword is called, and the attenuation control unit of the microwave frequency conversion module and the radio frequency power amplifier module are linked to achieve continuous and precise power output.

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