A method for controlling a guidance source signal

Abstract

The present invention belongs to the technical field of radar guidance, and specifically provides a guidance source signal control method. A signal generation system developed based on Labview can realize the automatic output of guidance source signals. By communicating with a noise source group, a signal generator group, a high-frequency signal generator group, an attenuator group, an encoder group, and a radio frequency signal modulation module through a control computer, all communication control methods are GPIB communications. By adopting the guidance source signal control method of the present invention, the automatic output of guidance source signals can be realized, assisting in detecting whether the active (semi-active) radar guidance detection function of an aircraft is good, automatically outputting the required guidance signals according to the program, without the need for physical targets, being able to provide a test guidance signal source for various types of aircraft and noise sources with various different parameters, shortening the output time of the guidance signal source, and significantly improving the test efficiency of the radar detection function of the aircraft.

Description

Technical Field

[0001] The present invention belongs to the technical field of radar guidance, and mainly relates to a method for controlling a guidance source signal. Background Art

[0002] In the aviation field, the radar system of an aircraft detects a target, outputs a real-time calculated target signal according to the movement trajectory of the target, and transmits it to the flight control system to complete guidance control. Therefore, it is crucial to detect the detection function of the radar for the target signal. At present, there are mainly two test methods for realizing the radar's target detection function: one is to test through a physical target. By using the signal reflected by the physical target and comparing it with the signal after mathematical calculation, the guidance detection function of the radar is detected. However, this method has high requirements for the target and the test site, which is not conducive to a large number of tests; the other is to load a simulated target into the radar module and then give corresponding medium and low-frequency attenuation signals to simulate the real-time change of the target information. At present, this method designs a simulated target for a certain type of specific product, such as an active radar product or a semi-active radar product, and during the test, it is necessary to manually adjust the intensity of the attenuation signal in real time and simulate various attitude signals of the simulated target. The test scenario is single, and the test efficiency is not high, and it is impossible to test multiple models of products. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method for controlling a guidance source signal to solve the problems existing in the above background art.

[0004] To solve the above technical problems, the present invention discloses a method for controlling a guidance source signal. Based on a signal generation system developed by LabVIEW, it can realize the automatic output of the guidance source signal. By communicating between a control computer and a noise source group, a signal generator group, a high-frequency signal generator group, an attenuator group, an encoder group, and a radio frequency signal modulation module, all communication control methods are GPIB communication; then the following steps are implemented in sequence:

[0005] S1: Enter the human-machine operation interface and perform a system self-check.

[0006] S2: The control computer detects whether the device is online through GPIB communication. Send an instruction through GPIB communication → Read the return instruction of each device → If it is not online or faulty, prompt an error through the built-in ERROR control of LabVIEW.

[0007] S3: After the self-check passes, select the model of the product to be tested on the human-machine interface, click Start Test. The software first sends commands to the radio frequency signal modulation module and the encoder group according to the selected model, and sets the corresponding modulation parameters of the radio frequency modulation module and the encoder group to prepare for outputting the initial target parameters.

[0008] S4: After the radio frequency modulation module is successfully set, the control signal generator group and the high-frequency signal generator group generate the initial target information of the corresponding model, which is transmitted to the encoder group and the radio frequency modulation module through the radio frequency interface. The radio frequency modulation module generates the initial target radio frequency signal information and enters the anechoic chamber. The output of the initial stage target guidance signal source is completed, and no parameter adjustment is required in this stage;

[0009] S5: Set the guidance signal source in the flight stage. Select the output of the guidance signal in the flight stage on the man-machine interface, and set the corresponding modulation parameters of the radio frequency modulation module and the encoder group for the initial target, and prepare to output the target parameters in the flight stage;

[0010] S6: Enter the parameter adjustment interface for the output of the guidance signal source in the flight stage. Set the signal generator group and the attenuator group to simulate different guidance signal sources in the flight stage and transmit them to the encoder group and the radio frequency modulation module through the radio frequency interface. The radio frequency modulation module generates radio frequency signal information such as target signals, ground echo signals, or correction signals and enters the anechoic chamber. The output of the guidance signal source for the target in the flight stage is completed;

[0011] S7: Set the target noise signal source in the flight stage. This function mainly provides the noise source required for testing in the flight guidance stage. While keeping steps 5 and 6, set the noise source group and the attenuator group to simulate the noise of different guidance signal sources in the flight stage and transmit them to the encoder group and the radio frequency modulation module through the radio frequency interface. The radio frequency modulation module generates radio frequency signal information such as target signals, ground echo signals, or correction signals and enters the anechoic chamber;

[0012] S8: According to different user situations, steps S4, S5, S6, and S7 can be manually repeated until the test is completed, or an automatic test program can be executed. The order is steps S4, S5, S6, S7 → steps S5, S6, S7 → repeat step S7.

[0013] The control computer selects the corresponding test product information according to the input information of the tester, controls the function generator group, the high-frequency signal generator group, the attenuator group, the encoder group, and the radio frequency signal modulation module, sets the corresponding parameters, and outputs the required echo signals and correction signals.

[0014] The control computer is an industrial control computer or a PXI chassis, which realizes the control of the function generator group, the high-frequency signal generator group, the attenuator group, the encoder group, and the radio frequency signal modulation module, and sets the corresponding parameters.

[0015] The high-frequency signal generator group is a combination of an FPGA high-frequency signal generation source module and a high-frequency power module, or a high-frequency signal generator, and outputs the corresponding high-frequency power signal as the initial target source.

[0016] The noise source group is mainly the FPGA circuit board group, which generates noise signals as baseband signals and can generate at least two noise source baseband signals.

[0017] The signal generator group is mainly the FPGA low-frequency signal generator or a dedicated function generator device, which outputs corresponding echo Doppler signals and clutter Doppler signals for simulating the echo and clutter signals required for target change. After passing through the radio frequency signal modulation module, it outputs corresponding echo and clutter Doppler information.

[0018] The attenuator group is mainly the FPGA attenuation module or the Agilent 1173A attenuator, generally consisting of 3 - 5 attenuation modules, which are used to control and correct the attenuation of signal, echo, clutter, leakage, and noise signal power.

[0019] The encoder group mainly outputs the C-frequency reference signal and the B-frequency coding signal, and is mainly the FPGA circuit board module group.

[0020] The radio frequency signal modulation module is a radio frequency modulation module that frequency multiplies, amplifies, single-sideband modulates, combines radio frequency power distribution, combines radio frequency switches, and has a precision attenuation device for the signals of the high-frequency frequency generator group, and finally outputs radio frequency signals, correction signals, and echo signals.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] By adopting the guidance source signal control method of the present invention, it is possible to realize the automatic output of the guidance source signal, assist in detecting whether the active (semi-active) radar guidance detection function of the aircraft is good, automatically output the required guidance signal according to the program, without the need for a physical target, and can provide a test guidance signal source and noise sources with various different parameters for various types of aircraft, shorten the output time of the guidance signal source, and significantly improve the test efficiency of the radar detection function of the aircraft. Brief Description of the Drawings

[0023] Figure 1 is the flowchart of the method of the present invention;

[0024] Figure 2 is the flowchart of the working components of the present invention. Detailed Embodiments

[0025] The present invention will be described in conjunction with the accompanying drawings.

[0026] Such as Figure 1 、 Figure 2As shown, a method for controlling a guidance source signal is a signal generation system developed based on LabVIEW, which can realize the automatic output of the guidance source signal and communicate with a noise source group, a signal generator group, a high-frequency signal generator group, an attenuator group, an encoder group, and a radio frequency signal modulation module through a control computer. Here, the noise source group, the signal generator group, the high-frequency signal generator group, and the attenuator group are all connected to the corresponding interfaces of the radio frequency signal modulation module through radio frequency line interfaces. All communication control methods are GPIB communications. Then, the following steps are implemented in sequence:

[0027] S1: Enter the human-machine operation interface and perform a system self-check.

[0028] S2: The control computer detects whether the device is online through GPIB communication, sends an instruction through GPIB communication → reads the return instruction of each device → if it is not online or faulty, an error is prompted through the built-in ERROR control of LabVIEW.

[0029] S3: After the self-check passes, select the model of the product to be tested on the human-machine interface, click Start Test. The software first sends commands to the radio frequency signal modulation module and the encoder group according to the selected model, and sets the corresponding modulation parameters of the initial target of the radio frequency modulation module and the encoder group (mainly amplification, single-side modulation, power distribution parameters, and C-frequency reference signal and B-frequency coding signal) to prepare for outputting the initial target parameters.

[0030] S4: After the radio frequency modulation module is successfully set, the control signal generator group and the high-frequency signal generator group generate the initial target information of the corresponding model, which is transmitted to the encoder group and the radio frequency modulation module through the radio frequency interface. The radio frequency modulation module generates the initial target radio frequency signal information and enters the microwave anechoic chamber. The output of the initial stage target guidance signal source is completed, and no parameter adjustment is required in this stage.

[0031] S5: Set the guidance signal source in the flight stage. Select the output of the guidance signal in the flight stage on the human-machine interface, and set the corresponding modulation parameters of the initial target of the radio frequency modulation module and the encoder group (mainly amplification, single-side modulation, power distribution parameters, and C-frequency reference signal and B-frequency coding signal) to prepare for outputting the target parameters in the flight stage.

[0032] S6: Enter the parameter adjustment interface of the guidance signal source in the flight phase, and set the signal generator group (set signals of different frequencies), the attenuator group (set power attenuation parameters) to simulate different flight phase guidance signal sources and transmit them to the encoder group and the RF modulation module through the RF interface. The RF modulation module generates RF signal information such as target signals, ground echo signals (semi-active radar), or correction signals (active radar) and enters the anechoic chamber. The output of the flight phase target guidance signal source is completed. In this phase, according to the conditions returned by the test product and the test requirements, adjust the parameters of the signal generator group (set signals of different frequencies) and the attenuator group (set attenuation parameters, generally 1 - 90 dB attenuation) on the man-machine interaction interface;

[0033] S7: Set the target noise signal source in the flight phase. This function mainly provides the noise source required for testing in the flight guidance phase. While keeping steps 5 and 6 in progress, set the noise source group and the attenuator group (set power attenuation parameters) to simulate different flight phase guidance signal source noises and transmit them to the encoder group and the RF modulation module through the RF interface. The RF modulation module generates RF signal information such as target signals, ground echo signals (semi-active radar), or correction signals (active radar) and enters the anechoic chamber;

[0034] S8: According to different user situations, steps S4, S5, S6, and S7 can be manually repeated until the test ends, or an automatic test program can be executed. The sequence is steps S4, S5, S6, S7 → steps S5, S6, S7 → repeat step S7.

[0035] The control computer selects the corresponding test product information according to the input information of the tester, controls the function generator group, high-frequency signal generator group, attenuator group, encoder group, and RF signal modulation module, sets the corresponding parameters, and outputs the required echo signals and correction signals.

[0036] The control computer is an industrial computer or a PXI chassis, which realizes controlling the function generator group, high-frequency signal generator group, attenuator group, encoder group, and RF signal modulation module and setting the corresponding parameters.

[0037] The high-frequency signal generator group is a combination of an FPGA high-frequency signal generation source module and a high-frequency power module, or a high-frequency signal generator, and outputs the corresponding high-frequency power signal as the initial target source.

[0038] The noise source group is mainly an FPGA circuit board group, which generates noise signals as baseband signals and can generate at least two noise source baseband signals.

[0039] The signal generator group mainly includes a low-frequency signal generator in the FPGA or a dedicated function generator device, which outputs corresponding echo Doppler signals and clutter Doppler signals for simulating the echo and clutter signals required for target change. The signals are output as corresponding echo and clutter Doppler information through the RF signal modulation module.

[0040] The attenuator group mainly includes an FPGA attenuation module or an Agilent 1173A attenuator, generally 3-5 attenuation modules, which are used to control and correct the attenuation of signal, echo, clutter, leakage, and noise signal power.

[0041] The encoder group mainly outputs a C-frequency reference signal and a B-frequency coding signal, and mainly includes an FPGA circuit board module group.

[0042] The RF signal modulation module is a RF modulation module that multiplies, amplifies, single-sideband modulates, combines RF power distribution, combines RF switches, and has a precision attenuation device for the signal of the high-frequency frequency generator group (after coding and modulation), and finally outputs RF signals, correction signals, and echo signals.

[0043] The present invention provides a method for controlling a guidance source signal. This method is convenient to operate, safe and reliable. Based on the signal generation system developed by LabVIEW, it can realize the automatic output of the guidance source signal. It communicates with the noise source group, signal generator group, high-frequency signal generator group, attenuator group, encoder group, and RF signal modulation module through a control computer; by controlling the noise source group, signal generator group, high-frequency signal generator group, attenuator group, encoder group, and RF signal modulation to perform corresponding functions at different times, the test is realized; it can realize the automatic output of the guidance source signal, assist in detecting whether the active (semi-active) radar guidance detection function of an aircraft is good, automatically output the required guidance signal according to the program, without a physical target, and can provide a test guidance signal source for various models of aircraft and noise sources with various different parameters, shorten the output time of the guidance signal source, and significantly improve the test efficiency of the radar detection function of the aircraft.

[0044] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept scope of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A guidance source signal control method, characterized in that: The signal generation system developed based on LabVIEW can automatically output the guidance source signal. It communicates with the noise source group, signal generator group, high-frequency signal generator group, attenuator group, encoder group, and RF signal modulation module through the control computer, and all communication control methods are GPIB communication. Then, the following steps are implemented in sequence: S1: Enter the human-machine operation interface and perform system self-check. S2: The control computer detects whether the devices are online through GPIB communication. It sends commands through GPIB communication → reads the return commands of each device → if a device is not online or has a fault, an error is prompted through the built-in ERROR control of LabVIEW. S3: After the self-check passes, select the model of the product to be tested on the human-machine interface and click Start Test. The software first sends commands to the RF signal modulation module and the encoder group according to the selected model, and sets the corresponding modulation parameters of the RF modulation module and the encoder group to prepare for outputting the initial target parameters. S4: After the RF modulation module is successfully set, the control signal generator group and the high-frequency signal generator group generate the initial target information of the corresponding model, which is transmitted to the encoder group and the RF modulation module through the RF interface. The RF modulation module generates the initial target RF signal information and enters the microwave anechoic chamber. The output of the initial stage target guidance signal source is completed, and no parameter adjustment is required in this stage. S5: Set the guidance signal source for the flight stage. Select the output of the guidance signal for the flight stage on the human-machine interface, and set the corresponding modulation parameters of the RF modulation module and the encoder group to prepare for outputting the target parameters for the flight stage. S6: Enter the parameter adjustment interface for the output of the guidance signal source in the flight stage. Set the signal generator group and the attenuator group to simulate different guidance signal sources in the flight stage, which are transmitted to the encoder group and the RF modulation module through the RF interface. The RF modulation module generates the RF signal information of the target signal, ground echo signal, or correction signal and enters the microwave anechoic chamber. The output of the guidance signal source for the flight stage target is completed. S7: Set the target noise signal source for the flight stage, which is used to provide the noise source required for the flight guidance stage test. While keeping steps 5 and 6, set the noise source group and the attenuator group to simulate different guidance signal source noises in the flight stage, which are transmitted to the encoder group and the RF modulation module through the RF interface. The RF modulation module generates the RF signal information of the target signal, ground echo signal, or correction signal and enters the microwave anechoic chamber. S8: According to different user situations, steps S4, S5, S6, and S7 can be manually repeated until the test ends, or an automatic test program can be executed. The sequence is steps S4, S5, S6, S7 → steps S5, S6, S7 → repeat step S7.

2. The guided source signal control method according to claim 1, characterized in that: The control computer selects the corresponding test product information according to the input information of the tester, controls the function generator group, high-frequency signal generator group, attenuator group, encoder group, and RF signal modulation module, sets the corresponding parameters, and outputs the required echo signal and correction signal.

3. The guided source signal control method according to claim 1, characterized in that: The control computer is an industrial control computer or a PXI chassis, which realizes the control of function generator sets, high-frequency signal generator sets, attenuator sets, encoder sets, and radio frequency signal modulation modules, and sets corresponding parameters.

4. The guidance source signal control method according to claim 1, characterized in that: The high-frequency signal generator set is a combination of an FPGA high-frequency signal generation source module and a high-frequency power module, or a high-frequency signal generator, and outputs a corresponding high-frequency power signal as the initial target source.

5. The guided source signal control method according to claim 1, characterized in that: The noise source set is an FPGA circuit board set, which generates noise signals as baseband signals and can generate at least two noise source baseband signals.

6. The guidance source signal control method according to claim 1, wherein: The signal generator set is an FPGA medium- and low-frequency signal generator or a dedicated function generator device, which outputs corresponding echo Doppler signals and clutter Doppler signals for simulating the echo and clutter signals required for target changes. The corresponding echo and clutter Doppler information is output through the radio frequency signal modulation module.

7. The guidance source signal control method according to claim 1, wherein: The attenuator set is an FPGA attenuation module or an Agilent 1173A attenuator, which is composed of 3 to 5 attenuation modules and is used to control and correct the attenuation of signal, echo, clutter, leakage, and noise signal power.

8. The guided source signal control method according to claim 1, wherein: The encoder set outputs a C-frequency reference signal and a B-frequency coding signal, which is an FPGA circuit board module set.

9. The guided source signal control method according to claim 1, characterized in that: The radio frequency signal modulation module is a radio frequency modulation module that multiplies, amplifies, single-sideband modulates, combines radio frequency power distribution, combines radio frequency switches, and has a precision attenuation device for the signals of the high-frequency frequency generator set, and finally outputs radio frequency signals, correction signals, and echo signals.

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