Guidance source signal control method

Abstract

The invention belongs to the technical field of radar guidance, and particularly provides a guidance source signal control method, which is based on a signal generation system developed by Labview, can realize automatic output of guidance source signals, and controls communication 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. And all communication control modes are GPIB (General Purpose Interface Bus) communication. By adopting the guidance source signal control method disclosed by the invention, the guidance source signal can be automatically output, whether an active (semi-active) radar guidance detection function of an aviation aircraft is good or not can be detected in an assisting manner, a required guidance signal is automatically output according to a program, a real object target is not needed, and the operation is convenient. The test guidance signal source and various noise sources with different parameters can be provided for various types of aviation aircrafts, the output time of the guidance signal source is shortened, and the test efficiency of the radar detection function of the aviation aircrafts is remarkably improved.

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 testing 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. Currently, 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, 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. The control computer communicates 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. All communication control methods are GPIB communication; then the following steps are implemented in sequence: S1: Enter the human-machine operation interface and perform a system self-check; S2: The control computer detects whether the device is online through GPIB communication. It sends an instruction through GPIB communication → reads the return instruction of each device → if it is not online or faulty, it prompts an error 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, 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; S4: After the radio frequency modulation module is successfully set, the control signal generator group and the high-frequency signal generator group generate initial target information of corresponding models, which is transmitted to the encoder group and the radio frequency modulation module through the radio frequency interface. The radio frequency modulation module generates 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; 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 radio frequency modulation module and the encoder group for the initial target, and prepare to output 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 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 microwave anechoic chamber. The output of the target guidance signal source in the flight stage is completed; S7: Set the target noise signal source for the flight stage. This function mainly provides the noise source required for the test 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 microwave anechoic chamber; 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 step S4, S5, S6, S7 → step S5, S6, S7 → repeat step S7.

[0005] The control computer selects 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 corresponding parameters, and outputs the required echo signals and correction signals.

[0006] The control computer is an industrial control computer or a PXI chassis, which realizes controlling the function generator group, the high-frequency signal generator group, the attenuator group, the encoder group, and the radio frequency signal modulation module, and setting corresponding parameters.

[0007] 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 corresponding high-frequency power signals as the initial target source.

[0008] 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.

[0009] 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 echo and clutter Doppler information is output through the RF signal modulation module.

[0010] 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.

[0011] The encoder group mainly outputs a C-frequency reference signal and a B-frequency coding signal, mainly an FPGA circuit board module group.

[0012] 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 signals of the high-frequency frequency generator group, and finally outputs RF signals, correction signals, and echo signals.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 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 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

[0014] Figure 1 is the flowchart of the method of the present invention; Figure 2 is the flowchart of the working components of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be described in conjunction with the accompanying drawings.

[0016] As Figure 1 , Figure 2 shown, a guidance source signal control method is a signal generation system developed based on LabVIEW, which 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; here, the noise source group, signal generator group, high-frequency signal generator group, attenuator group, and encoder group are all connected to the corresponding interfaces of the RF signal modulation module through RF line interfaces; all communication control methods are GPIB communication; then the following steps are implemented in sequence: S1: Enter the man-machine operation interface and perform a system self-check. S2: The control computer uses GPIB communication to detect whether the device is online. It sends commands through GPIB communication → reads the return commands from each device → if it is not online or has a fault, it uses the built-in ERROR control of LabVIEW to prompt an error. S3: After the self-check passes, select the model of the product to be tested on the man-machine interface and 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 for 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), and prepares to output the initial target parameters. S4: After the radio frequency modulation module is successfully set, control the signal generator group and the high-frequency signal generator group to generate the initial target information of the corresponding model, transfer it 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 parameters need to be adjusted in this stage. 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 initial target for 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), and prepare to output the target parameters in 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 (set signals of different frequencies) and the attenuator group (set power attenuation parameters) to simulate different guidance signal sources in the flight stage and transfer 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 (semi-active radar), or correction signals (active radar) and enters the microwave anechoic chamber. The output of the guidance signal source in the flight stage is completed. In this stage, it is necessary to 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 according to the conditions returned by the test product and the test requirements. S7: Set the target noise signal source in the flight stage. This function mainly provides the noise source required for the test in the flight guidance stage. While keeping steps 5 and 6, set the noise source group and the attenuator group (set power attenuation parameters) to simulate the noise of different guidance signal sources in the flight stage and transfer 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 (semi-active radar), or correction signals (active radar) 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: step S4, S5, S6, S7 → step S5, S6, S7 → repeat step S7.

[0017] The control computer selects 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 corresponding parameters, and outputs the required echo signals and correction signals.

[0018] The control computer is an industrial control computer or a PXI chassis, which realizes the control of the function generator group, high-frequency signal generator group, attenuator group, encoder group, and RF signal modulation module, and sets corresponding parameters.

[0019] 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 corresponding high-frequency power signals as the initial target source.

[0020] 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.

[0021] The signal generator group is mainly 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, and outputs corresponding echo and clutter Doppler information through the RF signal modulation module.

[0022] The attenuator group is mainly an FPGA attenuation module or an Agilent 1173A attenuator, generally 3 - 5 attenuation modules, which are used to control the attenuation of correction signals, echoes, clutters, leakage, and noise signal powers.

[0023] The encoder group mainly outputs a C-frequency reference signal and a B-frequency coding signal, and is mainly an FPGA circuit board module group.

[0024] The RF signal modulation module is a RF modulation module that frequency multiplies, amplifies, single-sideband modulates, combines RF power distribution, combines RF switches, and has a precision attenuation device for the signals of the high-frequency frequency generator group (after coding and modulation), and finally outputs RF signals, correction signals, and echo signals.

[0025] 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 radio frequency 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 radio frequency signal modulation to perform corresponding functions at different times, testing 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 types 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.

[0026] 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 scope of the technical concept 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 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 the control computer. 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 device is online through GPIB communication, sends instructions through GPIB communication → reads the return instructions of each device → if it is not online or faulty, the built-in ERROR control of LabVIEW will prompt an error; S3: After the self-test passes, select the model of the product to be tested on the human-machine interface, click to start the test, and the software first sends a command to the RF signal modulation module and the encoder group according to the selected model, sets the RF modulation module and the encoder group to set the corresponding modulation parameters of the initial target and prepares to output 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 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 initial target RF signal information and enters the microwave darkroom. The output of the target guidance signal source in the initial stage is completed, and no parameters need to be adjusted in this stage. S5: Set the flight phase guidance signal source, select the flight phase guidance signal output on the human-machine interface, set the RF modulation module and the encoder group to set the corresponding modulation parameters of the initial target, and prepare to output the flight phase target parameters; S6: Enter the flight phase guidance signal source output parameter adjustment interface, set the signal generator group and attenuator group to simulate different flight phase guidance signal sources, transmit them to the encoder group and RF modulation module through the RF interface, and the RF modulation module generates target signal, ground echo signal or correction signal and other RF signal information to enter the microwave darkroom, and the flight phase target guidance signal source output is completed; S7: Set the target noise signal source for the flight phase. This function mainly provides the noise source required for the flight guidance phase test. While continuing steps 5 and 6, set the noise source group and attenuator group to simulate the guidance signal source noise of different flight phases and transmit it to the encoder group and the RF modulation module through the RF interface. The RF modulation module generates RF signal information such as target signal, ground echo signal or correction signal to enter the microwave darkroom; S8: Depending on different user situations, steps S4, S5, S6, and S7 may be manually repeated until the test is completed, or an automatic test procedure may be executed in the order of steps S4, S5, S6, and S7 → steps S5, S6, and S7 → repeating step S7.

2. The guidance 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 radio frequency signal modulation module, sets the corresponding parameters, and outputs the required echo signal and correction signal.

3. The guidance source signal control method according to claim 1, characterized in that: The control computer is an industrial computer or a PXI chassis, which controls the function generator group, the high-frequency signal generator group, the attenuator group, the encoder group, and the radio frequency signal modulation module to set corresponding parameters.

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

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

6. The guidance source signal control method according to claim 1, characterized in that: The signal generator group mainly includes a low-frequency signal generator or a special function generator device in FPGA, which outputs corresponding echo Doppler signals and clutter Doppler signals, which are used to simulate the required echo and clutter signals of target changes, and outputs corresponding echo and clutter Doppler information through a radio frequency signal modulation module.

7. The guidance source signal control method according to claim 1, characterized in that: The attenuator group is mainly an FPGA attenuation module or an Agilent 1173A attenuator, generally 3-5 attenuation modules, which are used to control the attenuation of the correction signal, echo, clutter, leakage and noise signal power.

8. The guidance source signal control method according to claim 1, characterized in that: The encoder group mainly outputs a C-frequency reference signal and a B-frequency encoding signal, and is mainly an FPGA circuit board module group.

9. The guidance source signal control method according to claim 1, characterized in that: The RF signal modulation module is a RF modulation module that multiplies and amplifies the signal of the high-frequency generator group, performs single-sideband modulation, RF power distribution combination, RF switch combination, and precision attenuation device, and finally outputs RF signal, correction signal and echo signal.

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