An automated anti-interference rapid calibration system

Abstract

The invention discloses an automatic anti-interference rapid calibration system, comprising: interference source equipment, calibration equipment, a host computer and a high-precision turntable; the system realizes automatic calibration of interference intensity based on the host computer cooperating to control the calibration equipment, the high-precision turntable and the interference source equipment, and realizes rapid calibration through a coarse adjustment stage and a fine adjustment stage, thereby reducing the participation of personnel and the possibility of errors; the calibration equipment is rotated by a high-precision turntable, and data is collected in all directions, thereby avoiding the influence of the power imbalance of the signal emitted by the equipment on the equipment test result, and the coarse adjustment calibration stage is first performed before the fine adjustment calibration to realize rapid calibration, thereby reducing the workload of the fine adjustment calibration module.

Description

Technical Field

[0001] The invention relates to the technical field of satellite navigation, and in particular to an automated anti-interference rapid calibration system. Background Art

[0002] With the rapid development of satellite navigation technology, the BD satellite navigation system has become more and more mature and has been widely used on various weapon platforms, and has had an important impact on navigation, positioning and precision strike. Satellite navigation has been widely used in both military and civilian fields. In the military field, various precision-guided weapons, unmanned fighters, etc. are increasingly dependent on satellite navigation systems, and satellite navigation has become a "multiplier" for the performance of weapons and equipment. The importance of satellite navigation systems in terms of national strategic security and broad application prospects. However, due to inherent disadvantages such as weak signals and susceptibility to electromagnetic interference, satellite navigation applications have serious safety hazards. Due to the low transmission power and the long distance from the satellite to the earth's surface, the satellite signal is already very weak when it reaches the earth's surface, generally about -160dBW. Various intentional and unintentional interferences are near the surface of the earth, close to the receiver, which can easily cause the navigation receiver to fail to lock the satellite signal normally.

[0003] The increasing complexity of the electromagnetic environment and the increasing intensity of military confrontation have made potential hidden dangers a real threat. The satellite navigation frequency band is located in the L band of radio. Although it is protected by ITU regulations and the out-of-band suppression performance of a single device meets the requirements of relevant regulations, with the continuous increase of various wireless devices, the radio superposition effect of out-of-band radiation cannot be underestimated. The electromagnetic environment faced by navigation receivers in peacetime is becoming increasingly complex. More importantly, the military field is a field of high-intensity confrontation. At present, airborne GNSS jammers with kilowatts have been reported. It is not difficult to foresee that navigation receiving equipment will face increasingly severe challenges in the future confrontation environment.

[0004] During the testing process, there are the following disadvantages:

[0005] 1. There are many people involved in the calibration process, which may lead to a greater possibility of human error;

[0006] 2. It is not intelligent, and the calibration by different personnel varies greatly;

[0007] 3. Since there is a certain physical distance between the array element and the test array element, the interference test is not accurate. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides an automated anti-interference rapid calibration system.

[0009] The present invention is achieved through the following technical solutions:

[0010] An automated anti-interference rapid calibration system, comprising: an interference source device, a calibration device, a host computer and a high-precision turntable;

[0011] The calibration equipment receives the interference signal generated by the interference source equipment and calculates the in-band power after pre-processing it;

[0012] The host computer receives the in-band power sent by the calibration device, and controls the interference source device to repeatedly adjust the power of the output interference signal to perform coarse adjustment calibration on the interference signal, so that the deviation between the in-band power of the interference signal and the coarse adjustment power threshold meets the coarse adjustment calibration requirement;

[0013] The host computer controls the high-precision turntable to drive the calibration equipment to rotate and record the in-band power of the interference signal at the corresponding position, and calculates the mean and standard deviation of one rotation of the high-precision turntable;

[0014] The host computer changes the strength of the interference signal according to the mean and standard deviation to repeat fine-tuning and calibrate the interference signal that meets the coarse-tuning calibration requirements, so that the deviation between the in-band power of the interference signal and the fine-tuning power threshold meets the fine-tuning calibration requirements.

[0015] Working principle of this scheme: after starting the host computer, the host computer initializes the settings of each device, and resets the high-precision turntable, interference source device and calibration device; when all devices are fault-free, the host computer commands the interference source device to send an interference signal to start automatic calibration. The host computer first repeats the coarse adjustment calibration of the interference signal, and then repeats the fine adjustment calibration to obtain the calibration result that meets the fine adjustment calibration requirements. In the prior art test calibration process, when adjusting the output power of the interference source device, it is inevitable that the staff will adjust it. When the staff adjusts the interference source device or adjusts the turntable, the calibration differences between different personnel are large and very time-consuming. The automatic rapid calibration system designed in this scheme realizes the automatic calibration of the interference intensity based on the host computer. The host computer starts the calibration equipment to record data and rotate the high-precision turntable to realize the recording of interference intensity values ​​in multiple directions. After the rotation is completed, the turntable is adjusted up or down to change the interference source signal strength, and the test of different interference signal ratios is realized. Reduce the possibility of personnel participation and errors. By using a high-precision turntable to carry the calibration equipment, during the fine-tuning calibration process, the host computer controls the rotation of the high-precision turntable to achieve data collection in all directions, which can avoid affecting the equipment test results due to the imbalance of signal power emitted by the equipment. At the same time, it is more accurate than human operation. If it is adjusted manually, it is not only inaccurate, but when there are multiple interference transmitting antennas, a lot of manual adjustments will be required, which is very inconvenient. The system can be carried out in an automated manner and can be used in the anti-interference test process of BD, GPS, S, etc.

[0016] A further preferred solution is that the preprocessing process of the interference signal by the calibration device includes: the down-conversion module in the calibration device converts the interference signal from a radio frequency signal to an intermediate frequency signal.

[0017] A further preferred solution is that the calibration device also includes an antenna array and an AD module, the antenna array is used to receive the interference signal, and the AD module calculates the in-band power based on the preprocessed interference signal.

[0018] A further preferred solution is that the interference source device includes: a signal generating module, an up-conversion module, a power amplifier module and an interference transmitting antenna;

[0019] The signal generation module uses FPGA to generate intermediate frequency signals of various formats such as single carrier, broadband, frequency hopping, and frequency sweeping;

[0020] The up-conversion module converts the intermediate frequency signals of various formats into interference signals within the required frequency band;

[0021] The power amplifier module is used to amplify or attenuate the generated interference signal to meet the power value requirements during the test.

[0022] The interference transmitting antenna is installed at the location required by the test.

[0023] A further preferred solution is that the specific process of coarse adjustment calibration is: the host computer randomly extracts the in-band power data of 10 interference signals to calculate the average value, and determines whether the deviation between the average value and the coarse adjustment power threshold meets the coarse adjustment calibration requirement; if the deviation meets the coarse adjustment calibration requirement, fine adjustment calibration is performed; if the deviation does not meet the coarse adjustment calibration requirement, the host computer adjusts the power of the output interference signal and then performs the next coarse adjustment calibration;

[0024] The specific process of fine-tuning calibration is as follows: the host computer records the in-band power data of the interference signal when the high-precision turntable rotates one circle and calculates the average value and standard deviation, and determines whether the deviation between the average value and the fine-tuning power threshold meets the fine-tuning calibration requirements. If the deviation meets the fine-tuning calibration requirements, the calibration is stopped; if the deviation does not meet the fine-tuning calibration requirements, the host computer raises or lowers the high-precision turntable to change the intensity of the interference signal, and then performs the next fine-tuning calibration.

[0025] First, the interference signal is roughly calibrated so that the power deviation value returned by the calibration equipment is less than 1dB from the expected power. Then, the interference signal that meets the requirements of the rough calibration is finely calibrated. This step-by-step calibration can first screen out the interference signal with large deviation, reducing the workload of the fine calibration process. During the rough calibration process, since there will be a jump value when reading the data in real time, the average of 10 data is taken as the judgment value, which can avoid the inaccuracy caused by a single data jump. During the fine calibration process, the high-precision turntable rotates one circle, and all the data in this circle are read in real time to calculate the mean and standard deviation.

[0026] A further preferred solution is that the host computer is also used to predict the fluctuation of the in-band power in various directions according to the calculated in-band power standard deviation value and give corresponding warnings to the user.

[0027] The host computer will predict the fluctuation of power values ​​in each direction based on the calculated standard deviation. When the value is large, it means that there is a large power fluctuation that will affect the test results. The host computer prompts the user to check the status of each device.

[0028] A further preferred solution is that when the in-band power standard deviation value is large, the host computer prompts the user that there is a large power fluctuation.

[0029] A further preferred solution is that the coarse adjustment calibration requirement is: the deviation between the in-band power of the calibration device and the coarse adjustment power threshold is less than 1 dB;

[0030] The fine-tuning calibration requirement is that the deviation between the in-band power of the calibration device and the fine-tuning power threshold is less than or equal to 0.1 dB.

[0031] The present invention also provides an automated anti-interference rapid calibration method, comprising the following steps:

[0032] T1. After starting the host computer, initialize each device. After the device completes the initialization, it sends the initialization result to the host computer;

[0033] T2 The host computer determines whether the device is faulty; if there is no fault, the host computer commands the interference source device to send an interference signal; if there is a fault, the host computer reports the fault to the user;

[0034] T3, the host computer repeats the coarse adjustment calibration of the interference signal; if the deviation between the in-band power average value of the interference signal and the coarse adjustment power threshold meets the coarse adjustment calibration requirement, enter T4; otherwise, adjust the power of the interference signal output by the interference signal source and then perform the next coarse adjustment calibration;

[0035] T4, the host computer repeats fine-tuning and calibration of the interference signal; if the deviation between the in-band power average value of the interference signal and the fine-tuning power threshold meets the coarse-tuning calibration requirement, it enters T5; otherwise, the host computer increases or decreases the high-precision turntable to change the strength of the interference signal for the next fine-tuning calibration;

[0036] T5. Stop calibration and output the calibration results that meet the fine-tuning calibration requirements.

[0037] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0038] 1. The present invention provides an automated anti-interference rapid calibration system, which realizes automatic calibration of interference intensity based on a host computer, and realizes rapid calibration through a coarse adjustment stage and a fine adjustment stage, thereby reducing the involvement of personnel and the possibility of errors.

[0039] 2. The present invention provides an automated anti-interference rapid calibration system, which uses a high-precision turntable to rotate the calibration equipment and collects data in all directions, thereby avoiding the impact of equipment test results on equipment test results due to unbalanced signal power emitted by the equipment.

[0040] 3. The present invention provides an automated anti-interference rapid calibration system, which first undergoes a coarse adjustment calibration stage and then performs a fine adjustment calibration to achieve rapid calibration, and performs calibration step by step in order to reduce the workload of the fine adjustment calibration module and improve calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention.

[0042] In the attached picture:

[0043] Figure 1 Workflow diagram for automated anti-interference rapid calibration system;

[0044] Figure 2 This is a flowchart of the coarse adjustment calibration process;

[0045] Figure 3 A flowchart for fine-tuning the calibration process;

[0046] Figure 4 Quickly calibrate device wiring diagrams for automated anti-interference. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0048] Example 1

[0049] like Figure 1 As shown, the present invention aims to invent an automated anti-interference calibration device, so that the automated calibration process can be completed without human participation during the calibration process, eliminating the calibration differences caused by different standard gain antennas, and at the same time being able to better test the power reaching the antenna surface.

[0050] The interference source equipment is mainly composed of a signal generation module, an up-conversion module and a power amplifier module. Its principle block diagram is shown in Figure *. The signal generation module uses FPGA to complete signal generation, and can generate a variety of intermediate frequency signals such as single carrier, broadband, frequency hopping, and frequency sweep. The up-conversion module converts the intermediate frequency signal into an interference signal within the frequency band. The power amplifier can amplify and attenuate the generated interference signal through user settings to meet the power value requirements during the test.

[0051] The calibration equipment is mainly composed of an antenna array, a down-conversion module and an AD module. The interference signal is received through the antenna array. The down-conversion module converts the signal from a radio frequency signal to an intermediate frequency signal and hands it over to the AD module to complete signal adoption. After the AD module completes signal acquisition, it calculates the in-band power value and returns the calculated in-band power value to the host computer.

[0052] The high-precision turntable is program-controlled and rotates according to the rotation method of the actual test to achieve real-time monitoring of the power value.

[0053] The host computer is the core of the whole system. It completes the calibration after controlling each module to complete the corresponding operations.

[0054] The composition of the entire calibration equipment is shown in Table 1.

[0055] Table 1 Composition of automated calibration equipment

[0056] Serial number Device Name quantity Remark 1 Calibration equipment 1 2 High precision turntable 1 3 Controllable interference sources 1 4 Host computer 1

[0057] When the system is working, press Figure 4 The interference source and the transmitting antenna are connected through a radio frequency line, and the interference source, high-precision turntable, calibration equipment and PC are connected using RS232.

[0058] The workflow of the automatic calibration equipment is shown in 1. First, the host computer is started to initialize the settings. After the equipment is initialized, the initialization result is sent to the host computer. When a fault occurs, the host computer will automatically report the fault to the user. After the equipment is initialized, the host computer starts the automatic calibration. The main steps are as follows:

[0059] like Figure 2 As shown, in the coarse adjustment stage, the interference source is set to send a signal, and the in-band power value returned by the calibration device is compared with the expected power threshold. When the signal is weak, the interference signal is increased, and when the signal is strong, the interference signal is decreased, so that the deviation between the in-band power value returned by the calibration device and the expected power threshold is less than 1dB.

[0060] like Figure 3As shown, in the fine-tuning stage, the calibration equipment is rotated using a turntable, and the in-band power of the calibration equipment is recorded at the same time. After the turntable rotates one circle, the recorded in-band power is averaged (Formula 1) and standard deviation (Formula 2), and the interference source transmission power is adjusted according to the difference between the mean and the expected power value. The calibration is repeated, and the calibration is stopped when the deviation between the in-band power value and the expected power threshold is less than or equal to 0.1dB (this value can be set as a default). At the same time, the host computer can predict the fluctuation of the power value in each direction based on the calculated standard deviation value. When the value is large, it means that there is a large power fluctuation that will affect the test results. The host computer prompts the user to detect the status of each device.

[0061]

[0062]

[0063] The automated anti-interference rapid calibration method realizes the automatic calibration of interference intensity based on the host computer, and can achieve the purpose of rapid calibration through the coarse adjustment stage and the fine adjustment stage. The system realizes automatic calibration, reducing the possibility of human involvement and errors. Since data is collected in all directions, it can avoid affecting the equipment test results due to the imbalance of signal power emitted by the equipment.

[0064] The specific implementation methods described above further illustrate the objectives, technical methods and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automated anti-interference rapid calibration system, characterized in that: include: Interference source equipment, calibration equipment, host computer and high-precision turntable; The calibration equipment receives the interference signal generated by the interference source equipment and calculates the in-band power after pre-processing it; The host computer receives the in-band power sent by the calibration device, and controls the interference source device to repeatedly adjust the power of the output interference signal to perform coarse adjustment calibration on the interference signal, so that the deviation between the in-band power of the interference signal and the coarse adjustment power threshold meets the coarse adjustment calibration requirement; The host computer controls the high-precision turntable to drive the calibration equipment to rotate and record the in-band power of the interference signal at the corresponding position, and calculates the mean and standard deviation of one rotation of the high-precision turntable; The host computer changes the strength of the interference signal according to the mean and standard deviation to repeat fine-tuning and calibrate the interference signal that meets the coarse-tuning calibration requirements, so that the deviation between the in-band power of the interference signal and the fine-tuning power threshold meets the fine-tuning calibration requirements.

2. The automated anti-interference rapid calibration system according to claim 1, characterized in that: The preprocessing process of the calibration device on the interference signal includes: the down-conversion module in the calibration device converts the interference signal from a radio frequency signal to an intermediate frequency signal.

3. The automated anti-interference rapid calibration system according to claim 1, characterized in that: The calibration device also includes an antenna array and an AD module. The antenna array is used to receive interference signals, and the AD module calculates in-band power based on the preprocessed interference signals.

4. The automated anti-interference rapid calibration system according to claim 1, characterized in that: The interference source device includes: a signal generating module, an up-conversion module, a power amplifier module and an interference transmitting antenna; The signal generation module uses FPGA to generate intermediate frequency signals of multiple formats such as single carrier, broadband, frequency hopping, and frequency sweeping; The up-conversion module converts the intermediate frequency signals of various formats into interference signals within the required frequency band; The power amplifier module is used to amplify or attenuate the generated interference signal to meet the power value requirements during the test.

5. The automated anti-interference rapid calibration system according to claim 1, characterized in that: The specific process of coarse adjustment calibration is as follows: the host computer randomly extracts the in-band power data of 10 interference signals to calculate the average value, and determines whether the deviation between the average value and the coarse adjustment power threshold meets the coarse adjustment calibration requirements; if the deviation meets the coarse adjustment calibration requirements, fine adjustment calibration is performed; if the deviation does not meet the coarse adjustment calibration requirements, the host computer adjusts the power of the output interference signal and then performs the next coarse adjustment calibration; The specific process of fine-tuning calibration is as follows: the host computer records the in-band power data of the interference signal when the high-precision turntable rotates one circle and calculates the average value and standard deviation, and determines whether the deviation between the average value and the fine-tuning power threshold meets the fine-tuning calibration requirements. If the deviation meets the fine-tuning calibration requirements, the calibration is stopped; if the deviation does not meet the fine-tuning calibration requirements, the host computer raises or lowers the high-precision turntable to change the intensity of the interference signal, and then performs the next fine-tuning calibration.

6. The automated anti-interference rapid calibration system according to claim 5, characterized in that: The host computer is also used to predict the fluctuation of the in-band power in various directions according to the calculated in-band power standard deviation value and give corresponding warnings to the user.

7. The automated anti-interference rapid calibration system according to claim 6, characterized in that: When the in-band power standard deviation value is large, the host computer prompts the user that there is a large power fluctuation.

8. The automated anti-interference rapid calibration system according to claim 1, characterized in that: The coarse adjustment calibration requirement is that the deviation between the in-band power of the calibration equipment and the coarse adjustment power threshold is less than 1 dB; The fine-tuning calibration requirement is that the deviation between the in-band power of the calibration device and the fine-tuning power threshold is less than or equal to 0.1 dB.

9. An automated anti-interference rapid calibration method, characterized in that: The method is implemented based on the automated anti-interference rapid calibration system according to claim 1, and the method comprises the following steps: T1. After starting the host computer, initialize each device. After the device completes the initialization, it sends the initialization result to the host computer; T2 The host computer determines whether the device is faulty; if there is no fault, the host computer commands the interference source device to send an interference signal; if there is a fault, the host computer reports the fault to the user; T3, the host computer repeats the coarse adjustment calibration of the interference signal; if the deviation between the in-band power average value of the interference signal and the coarse adjustment power threshold meets the coarse adjustment calibration requirement, enter T4; otherwise, adjust the power of the interference signal output by the interference signal source and then perform the next coarse adjustment calibration; T4, the host computer repeats fine-tuning and calibration of the interference signal; if the deviation between the in-band power average value of the interference signal and the fine-tuning power threshold meets the fine-tuning and calibration requirements, it enters T5; otherwise, the host computer increases or decreases the high-precision turntable to change the strength of the interference signal for the next fine-tuning and calibration; T5. Stop calibration and output the calibration results that meet the fine-tuning calibration requirements.

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