Portable radio frequency radiation device for radar system test and use method

Abstract

The invention relates to the technical field of electronic radio frequency detection, and discloses a portable radio frequency radiation device for radar system testing and a use method, and the portable radio frequency radiation device comprises a microwave source module, a radio frequency amplification module, a radiation antenna and a power supply module, the microwave source module is composed of a built-in reference crystal oscillator, a phase-locked loop, a frequency doubler, a single-pole four-throw switch and four groups of ceramic filters, and is used for generating four switchable frequency point signals of 20GHz, 24GHz, 30GHz and 35GHz. According to the multi-point-frequency radio-frequency radiation device for the radar detection system and the use method, the frequency multiplier and the single-pole four-throw switch are combined for use, the function that the device is rapidly switched among different frequencies is achieved, the requirement of a radar system test for multiple frequencies is effectively met, and the fluency of the detection process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic radio frequency detection, and particularly to a portable radio frequency radiation device for radar system testing and a usage method thereof. Background Art

[0002] Radar systems are widely used in military, meteorological, and transportation fields, etc. Their anti-interference ability and electromagnetic compatibility directly determine the system reliability. Traditional testing methods have significant limitations in multi-band and miniaturized scenarios:

[0003] (1) The port connection method is cumbersome to operate and highly dependent on the environment. During the testing process, it is necessary to frequently disassemble the radar input port connector, resulting in interface wear and aging, shortening the equipment life. At the same time, it is necessary to build a specific test link, which is time-consuming and has low flexibility, and it is difficult to meet the requirements of on-site rapid testing;

[0004] (2) The space radiation method is costly and inefficient. During the testing process, it has high requirements for the testing environment, relying on microwave anechoic chambers or open fields, with high testing costs. The radio frequency radiation device is large in volume and slow in frequency band switching, and it is difficult to meet the multi-band rapid testing requirements. Summary of the Invention

[0005] To solve the problems of large volume, strong environmental dependence, and high cost of radio frequency devices in traditional radar testing methods. The present invention proposes a multi-point frequency radio frequency radiation device, which can be designed as a handheld type, not only small in volume and convenient to carry, but also convenient for the deployment of on-site detection environments, without relying on fixed testing environments, reducing costs; it can intelligently and quickly achieve multi-band switching, expanding the detection dynamic range of the device, so as to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A portable radio frequency radiation device for radar system testing, including a microwave source module, a radio frequency amplification module, a radiation antenna, and a power supply module,

[0007] The microwave source module is composed of a built-in reference oscillator, a phase-locked loop, a frequency doubler, a single-pole four-throw switch, and 4 groups of ceramic filters, and is used to generate four switchable frequency signals of 20 GHz, 24 GHz, 30 GHz, and 35 GHz;

[0008] The radio frequency amplifier module includes a first-stage amplifier, a digital control attenuator, a gain amplifier, a final-stage amplifier, and a forward and reverse coupler, with a gain range ≥ 20 dB and an output power ≥ 10 dBm;

[0009] The radiation antenna adopts a horn antenna, with an interface of 2.92 mm, a working frequency band covering 18 - 40 GHz, and a gain ≥ 10 dB;

[0010] The control module includes a hardware control module and a software control module, which are based on FPGA to realize the numerical control adjustment of frequency, pulse width, power and status monitoring; the hardware control module is implemented based on the FPGA control circuit board, and is responsible for display screen interactive communication, frequency source control, temperature detection, power detection, overcurrent protection and overvoltage protection; the software control module realizes parameter configuration, adjustment, storage and monitoring functions, including screen parameter configuration, key parameter acquisition, set parameter storage module, self-check program and frequency source control logic;

[0011] The power supply module supports dual power supply of 220V mains and lithium battery, and the battery capacity ≥ 8000mAh, which is used to provide power for the whole device.

[0012] The microwave source module also includes several ceramic filters, which are connected to the single-pole four-throw switch, and are used to filter the received radio frequency signal and generate radio frequency signals of different frequencies. The filtered signal is output through the single-pole four-throw switch line; the microwave source module outputs 10GHz, 12GHz, 15GHz, and 17.5GHz fundamental signals through the phase-locked loop in a time-sharing manner, and realizes spurious suppression ≥ 60dBc through the frequency doubler and ceramic filter bank.

[0013] In the RF amplifier module, the RF signal is amplified by the first-stage amplifier, equalized by the equalizer, attenuated by the digital control attenuator, and then power-amplified by the second-stage amplifier.

[0014] The forward and reverse couplers in the RF amplifier module are connected to the detectors one by one. The amplified RF signal is separated into the forward signal and the reverse signal through the forward and reverse couplers, and is sent to the corresponding detectors respectively.

[0015] The FPGA chip of the hardware control module is a domestic chip, which is connected to the display screen through the serial port, receives the frequency setting, power setting and switch signal input by the display screen, and outputs the control signal to the microwave source module;

[0016] The FPGA chip is connected to the temperature sensor, power detection module, voltage detection module, current detection module, microwave switch, gain adjustment module and frequency source through the IO interface, and the level of each interface is the TTL standard;

[0017] The control module supports programmable output with a pulse width of 2 - 8μs (step 1μs) and a period of 10μs, and has a parameter storage function.

[0018] The display screen of the software control module uses a capacitive touch screen and communicates with the FPGA chip through the serial port; the touch screen parses the frequency, power and pulse width adjustment instructions input by the user and transmits them to the FPGA chip, and the FPGA chip executes the control logic and feeds back the system status information to the touch screen for real-time display.

[0019] The process includes:

[0020] The bare chip is eutectically welded to the molybdenum-copper carrier, and the shear strength is ≥50 N;

[0021] The gold wire bonding process, and the bonding force is ≥3.5 g;

[0022] The circuit board is sintered with the cavity, and the porosity is ≤25%.

[0023] The present invention also provides the following technical solution: A method for using a portable radio frequency radiation device for radar system testing, characterized in that it includes the following steps:

[0024] S1. Start the device, and send a start command to the microwave source module through the control module;

[0025] S2. The microwave source module generates a radio frequency signal according to the set frequency and transmits it to the radio frequency amplifier module;

[0026] S3. After the radio frequency amplifier module amplifies the signal power, part of the signal is separated by the forward and reverse couplers and sent to the detector;

[0027] S4. The amplified radio frequency signal is output to the radiation antenna module and radiated outward by the horn antenna as the detection signal of the radar system.

[0028] The start command is generated and sent through the touch screen interface of the control module. The microwave source module outputs the radio frequency signal to the radio frequency amplifier module and the radiation antenna module, and at the same time feeds back the signal parameters to the touch screen for display.

[0029] The microwave source module generates a stable radio frequency signal as the system frequency reference. The radio frequency amplifier module separates the signal to the detector through the forward and reverse couplers for real-time monitoring. The radiation antenna module ensures the directivity and efficiency of signal radiation. The control module coordinates the operation of each module and displays the working parameters in real time;

[0030] After the device is started, real-time communication is carried out between the microwave source module, the radio frequency amplifier module and the radiation antenna module through the control module to complete instruction transmission and status synchronization.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: The microwave source module of the portable radio frequency radiation device and its usage method for radar system testing utilizes the phase-locked loop technology to ensure the stability and accuracy of the frequency; the radio frequency amplification module is responsible for amplifying the signals generated by the microwave source to meet the power requirements for testing; the radiation antenna, as a key component for signal transmission, is used to control the directivity and coverage range of the signals; the frequency multiplier of the present invention is combined with a single-pole four-throw switch to achieve the function of quickly switching the device between different frequencies, effectively meeting the multi-frequency requirements of radar system testing and improving the fluency of the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0033] Figure 1 It is a block diagram of the multi-frequency radio frequency radiation device according to an embodiment of the present invention;

[0034] Figure 2 It is a block diagram of the microwave source module according to an embodiment of the present invention;

[0035] Figure 3 It is a block diagram of the radio frequency amplification module according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "equipped with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1

[0040] Please refer to Figures 1-3 , the present invention provides a technical solution: a portable radio frequency radiation device for radar system testing, including a microwave source module, a radio frequency amplification module, a radiation antenna, and a power supply module.

[0041] The microwave source module is composed of a built-in reference crystal oscillator, a phase-locked loop, a frequency doubler, a single-pole four-throw switch, and 4 groups of ceramic filters, and is used to generate four switchable frequency signals of 20 GHz, 24 GHz, 30 GHz, and 35 GHz.

[0042] The radio frequency amplifier module includes a first-stage amplifier, a digital control attenuator, a gain amplifier, a final-stage amplifier, and a forward and reverse coupler, with a gain range ≥ 20 dB and an output power ≥ 10 dBm.

[0043] The radiation antenna uses a horn antenna, with an interface of 2.92 mm, a working frequency band covering 18 - 40 GHz, and a gain ≥ 10 dB.

[0044] The control module includes a hardware control module and a software control module, and realizes the digital control adjustment and status monitoring of frequency, pulse width, and power based on FPGA; the hardware control module is realized based on the FPGA control circuit board, and is responsible for display screen interactive communication, frequency source control, temperature detection, power detection, overcurrent protection, and overvoltage protection; the software control module realizes parameter configuration, adjustment, storage, and monitoring functions, including screen parameter configuration, button parameter acquisition, set parameter storage module, self-check program, and frequency source control logic.

[0045] The power supply module supports dual power supply of 220V mains and lithium battery, with a battery capacity ≥ 8000 mAh, and is used to provide power for the overall device.

[0046] The device is designed with a gun-shaped metal body, with dimensions ≤ 260*200*150 mm and weight ≤ 2 kg, and is equipped with an adjustable tripod.

[0047] The microwave source module also includes several ceramic filters. The ceramic filters are connected to a single-pole four-throw switch and are used to filter the received radio frequency signals and generate radio frequency signals of different frequencies. The filtered signals are output through the single-pole four-throw switch circuit; the microwave source module outputs 10 GHz, 12 GHz, 15 GHz, and 17.5 GHz fundamental signals in a time-sharing manner through a phase-locked loop, and the spurious suppression ≥ 60 dBc is achieved through a frequency doubler and a ceramic filter bank.

[0048] In the radio frequency amplifier module, the radio frequency signal is amplified by a first-stage amplifier, equalized by an equalizer, attenuated by a digital control attenuator, and then power-amplified by a second-stage amplifier.

[0049] The forward and reverse couplers in the radio frequency amplifier module are connected to the detectors one by one. The amplified radio frequency signal is separated into a forward signal and a reverse signal through the forward and reverse couplers and sent to the corresponding detectors respectively.

[0050] The FPGA chip of the hardware control module is a domestic chip, which is connected to the display screen through a serial port, receives the frequency setting, power setting, and switch signal input by the display screen, and outputs a control signal to the microwave source module;

[0051] The FPGA chip is connected to a temperature sensor, a power detection module, a voltage detection module, a current detection module, a microwave switch, a gain adjustment module, and a frequency source through IO interfaces, and the level of each interface is in TTL standard;

[0052] The control module supports programmable output with a pulse width of 2 - 8 μs (step 1 μs) and a period of 10 μs, and has a parameter storage function.

[0053] The display screen of the software control module uses a capacitive touch screen and communicates with the FPGA chip through a serial port; the touch screen parses the frequency, power, and pulse width adjustment instructions input by the user and transmits them to the FPGA chip, and the FPGA chip executes the control logic and feeds back the system status information to the touch screen for real-time display.

[0054] Embodiment 2

[0055] The process of a portable radio frequency radiation device for radar system testing includes:

[0056] The bare chip is eutectically welded to the molybdenum-copper carrier, and the shear strength ≥ 50 N;

[0057] The gold wire bonding process, with a bonding force ≥ 3.5 g;

[0058] The circuit board is sintered with the cavity, and the void ratio is ≤ 25%

[0059] Embodiment 3

[0060] A method for using a portable radio frequency radiation device for radar system testing, comprising the following steps:

[0061] S1. Start the device, and send a start command to the microwave source module through the control module; the start command is generated and sent through the touch screen interface of the control module. The microwave source module outputs the radio frequency signal to the radio frequency amplifier module and the radiation antenna module, and at the same time feeds back the signal parameters to the touch screen for display.

[0062] S2. The microwave source module generates a radio frequency signal according to the set frequency and transmits it to the radio frequency amplifier module; the microwave source module generates a stable radio frequency signal as the system frequency reference. The radio frequency amplifier module separates the signal to the detector through the forward and reverse couplers for real-time monitoring. The radiation antenna module ensures the directivity and efficiency of signal radiation. The control module coordinates the operation of each module and displays the working parameters in real time.

[0063] S3. After the radio frequency amplifier module amplifies the signal power, it separates a part of the signal through the forward and reverse couplers and sends it to the detector;

[0064] S4. The amplified radio frequency signal is output to the radiation antenna module and radiated outward by the horn antenna as the detection signal of the radar system.

[0065] After the device is started, the microwave source module, the radio frequency amplifier module and the radiation antenna module communicate with each other in real time through the control module to complete instruction transmission and status synchronization.

[0066] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable radio frequency radiation device for radar system testing, comprising a microwave source module, a radio frequency amplification module, a radiation antenna and a power supply module, characterized in that: The microwave source module is composed of a built-in reference crystal oscillator, a phase-locked loop, a frequency doubler, a single-pole four-throw switch and 4 groups of ceramic filters, and is used to generate four switchable frequency signals of 20 GHz, 24 GHz, 30 GHz and 35 GHz; The radio frequency amplifier module includes a first-stage amplifier, a digital control attenuator, a gain amplifier, a final-stage amplifier and a forward and reverse coupler, with a gain range ≥ 20 dB and an output power ≥ 10 dBm; The radiation antenna uses a horn antenna with an interface of 2.92 mm, and the operating frequency band covers 18 - 40 GHz with a gain ≥ 10 dB; The control module includes a hardware control module and a software control module, which realizes digital control adjustment and status monitoring of frequency, pulse width and power based on FPGA; the hardware control module is realized based on an FPGA control circuit board, and is responsible for display screen interactive communication, frequency source control, temperature detection, power detection, overcurrent protection and overvoltage protection; the software control module realizes functions of parameter configuration, adjustment, storage and monitoring, including screen parameter configuration, key parameter acquisition, set parameter storage module, self-check program and frequency source control logic; The power supply module supports dual power supply of 220V mains and lithium battery, with a battery capacity ≥ 8000 mAh, and is used to provide power for the whole device.

2. The portable radio frequency radiation device for radar system testing according to claim 1, wherein: The microwave source module further includes several ceramic filters, and the ceramic filters are connected to the single-pole four-throw switch, and are used to filter the received radio frequency signal and generate radio frequency signals of different frequencies, and the filtered signal is output through the single-pole four-throw switch line; the microwave source module outputs 10 GHz, 12 GHz, 15 GHz and 17.5 GHz fundamental wave signals in a time-sharing manner through the phase-locked loop, and realizes spurious suppression ≥ 60 dBc through the frequency doubler and the ceramic filter bank.

3. A portable radio frequency radiation device for radar system testing according to claim 1, characterized in that: In the radio frequency amplifier module, the radio frequency signal is amplified by the first-stage amplifier, equalized by the equalizer, attenuated by the digital control attenuator, and then power-amplified by the second-stage amplifier.

4. A portable radio frequency radiation device for radar system testing according to claim 1, characterized in that: The forward and reverse couplers in the radio frequency amplifier module are respectively connected to the detectors one by one, and the amplified radio frequency signal is separated into a forward signal and a reverse signal through the forward and reverse coupler, and is respectively sent to the corresponding detectors.

5. The portable radio frequency radiation device for radar system testing according to claim 1, wherein: The FPGA chip of the hardware control module is a domestic chip, which is connected to the display screen through a serial port, receives the frequency setting, power setting and switch signal input by the display screen, and outputs a control signal to the microwave source module; The FPGA chip is connected to a temperature sensor, a power detection module, a voltage detection module, an current detection module, a microwave switch, a gain adjustment module and a frequency source through an IO interface, and the level of each interface is of TTL standard; The control module supports programmable output with a pulse width of 2 - 8 μs and a period of 10 μs, and has a parameter storage function.

6. The portable radio frequency radiation device for radar system testing according to claim 1, characterized in that: The display screen of the software control module uses a capacitive touch screen and communicates with the FPGA chip through a serial port. The touch screen parses the frequency, power, and pulse width adjustment commands input by the user and transmits them to the FPGA chip. The FPGA chip executes the control logic and feeds back the system status information to the touch screen for real-time display.

7. A portable radio frequency radiation device for radar system testing according to claim 1, characterized in that: The process includes: The bare chip is eutectically welded to the molybdenum-copper carrier, and the shear strength is ≥50N; The gold wire bonding process, and the bonding force is ≥3.5g; The circuit board is sintered with the cavity, and the void ratio is ≤25%.

8. A method for using a portable radio frequency radiation device for radar system testing, characterized in that: It includes the following steps: S1. Start the device and send a start command to the microwave source module through the control module; S2. The microwave source module generates a radio frequency signal according to the set frequency and transmits it to the radio frequency amplifier module; S3. After the radio frequency amplifier module amplifies the signal power, it separates a part of the signal through the forward and reverse couplers and sends it to the detector; S4. The amplified radio frequency signal is output to the radiation antenna module and radiated outward by the horn antenna as the detection signal of the radar system.

9. The usage method of a portable radio frequency radiation device for radar system testing according to claim 8, characterized in that: The start command is generated and sent through the touch screen interface of the control module. The microwave source module outputs the radio frequency signal to the radio frequency amplifier module and the radiation antenna module, and at the same time feeds back the signal parameters to the touch screen for display.

10. The usage method of a portable radio frequency radiation device for radar system testing according to claim 8, characterized in that: The microwave source module generates a stable radio frequency signal as the system frequency reference. The radio frequency amplifier module separates the signal to the detector through the forward and reverse couplers for real-time monitoring. The radiation antenna module ensures the directivity and efficiency of signal radiation. The control module coordinates the operation of each module and displays the working parameters in real time; After the device is started, real-time communication is carried out among the microwave source module, the radio frequency amplifier module, and the radiation antenna module through the control module to complete command transmission and status synchronization.

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