CN114172592B - Calibration system and calibration method of radio frequency digital T/R assembly comprehensive test system - Google Patents
Calibration system and calibration method of radio frequency digital T/R assembly comprehensive test system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
Abstract
The invention provides a calibration system and a method of a radio frequency digital T/R assembly comprehensive test system, wherein the calibration system consists of a directional coupler, a pulse power meter, a multi-channel transmission standard device, a standard analog part (a low-power attenuator and a phase shifter) and a standard digital code element generator. The high power in the test system pulse is calibrated by using a directional coupler and adopting a coupling ratio method; a multichannel transmission standard device is researched and established, and a transmission method is adopted to calibrate the transmitting and receiving analog quantity of the test system; the standard simulation part is used, and an insertion method is adopted to calibrate the consistency of the digital amplitude of the receiving channel of the test system; and a digital code element generator is built to verify the digital performance of the test system.
Description
Technical Field
The invention belongs to the technical field of microwave testing, and particularly relates to a calibration system and a calibration method of a testing system.
Background
Aiming at the measurement accuracy and magnitude traceability requirements of a digital array radar core component-radio frequency digital T/R component test system, a solution is provided. The radio frequency microwave digital test system mainly integrates and conditions various instruments and equipment with different functions such as a signal generator, a pulse power meter (a power sensor), a vector network analyzer (a noise option is optional), control and data acquisition equipment and the like through a complex signal switching center, and realizes the test of related items of a digital T/R component through an industrial personal computer and test software. At present, the existing domestic measurement standards are used for carrying out measurement work of discrete parameters according to analog quantities such as power, amplitude, phase and the like of a test system, and an integral quick on-site calibration means is lacked; for each parameter of the digital quantity of the test system, no method can develop the quantity transmission work of the related parameter at present, and the accuracy and reliability of the quantity transmission cannot be ensured. Therefore, the research of the calibration technology of the test system is urgently needed to be carried out, and the problem of integral calibration of the radio frequency microwave digital test system is solved.
Disclosure of Invention
Aiming at the problems of heavy task, complex test system, high test requirement, poor test consistency, difficult traceability of problems and the like faced by the measurement of a radar T/R production line, the invention solves the problem of in-situ integral quantity transmission of a radio frequency microwave digital test system by the research of a metering method and a transmission standard and the simulation calculation of a digital signal and combining with an informatization and automation means, and realizes the on-site integral calibration of a digital test system. Developing calibration technology research work of analog quantity transmission parameter power, amplitude, phase and the like of digital test systems with different frequency bands and different types, developing a multi-channel transmission standard device, developing error analysis and correction technology research of the broadband standard device in different connector forms, evaluating and verifying repeatability and stability and uncertainty of the standard device, establishing a transmission standard, and solving the problem of on-site integral rapid calibration of analog quantity transmitted and received by the test system; developing the research work of the calibration technology of the digital quantity of the test system, developing a standard digital code element generator suitable for the digital test system, adopting the standard digital code element generator to generate standard code elements (including digital phase shift, attenuation, noise and the like), checking the correctness of optical fiber transmission and data acquisition card/recording equipment, and analyzing and processing the output data of a receiving channel to obtain the correctness of an algorithm; and (3) developing a calibration technical study of digital amplitude and phase of the test system, and utilizing a standard analog part to match with a relatively stable tested digital receiving and transmitting module to realize the consistency calibration of the digital amplitude and phase of a receiving channel of the test system, ensure the accuracy and the effectiveness of amplitude and phase quantity transmission and verify the reliability of time sequence and synchronization of the test system.
Establishing a calibration system for calibrating a radio frequency microwave digital class test system with frequency coverage from a P band to an L band and providing an overall test solution, wherein the calibration system comprises the following specific steps:
a calibration system for a comprehensive test system of a radio frequency digital T/R assembly comprises a directional coupler, a pulse power meter, a multi-channel transmission standard device, a standard analog component (a low-power attenuator and a phase shifter) and a standard digital code element generator. The high power in the test system pulse is calibrated by using a directional coupler and adopting a coupling ratio method; using a multi-channel transmission standard device, and calibrating the transmitting and receiving analog quantity of the test system by adopting a transmission method; using a standard simulation part, and calibrating the digital amplitude consistency of the receiving channel of the test system by an insertion method; and verifying the digital performance of the test system by using a standard digital code element generator.
The multi-channel transmission standard device is shown in fig. 2, and can provide standard quantities of amplitude and phase parameters of multiple channels so as to meet the problem of on-site rapid overall calibration of transmitting and receiving analog quantities. The multi-channel transmission standard device 15 comprises a power divider 16, a one-to-eight load switch 17, an electric control 1dB step attenuator 18, an electric control phase shifter 19, an electric control 10dB step attenuator 20, a control board 21, one end 22 of the power divider, a switch end 23, a transmission standard ToutRin port 24, a reference output end 25, a LAN port 26, a power supply 27, a reference input end 28, two ends 29 of the power divider and a signal input end 30. The control board 21 performs state control on the one-to-eight load switch 17, the electric control phase shifter 19, the electric control 1dB step attenuator 18 and the electric control 10dB step attenuator 20; for a transmitting path, a signal passes through a signal input end 30, is split into two parts through a power divider 16, wherein one end 22 of the power divider is in short circuit with a switch end 23 through a rigid cable, then is output to a transmission standard ToutRin port 24 after passing through an eight-branch load switch 17, is in short circuit with a reference input end 28 through a rigid cable, and then is transmitted to a reference output end 25 through an electric control 1dB step attenuator 18, an electric control phase shifter 19 and an electric control 10dB step attenuator 20; for the receiving path, the signal is input through a transmission standard toutirin port 24 to a switch end 23 through an eight-split load switch 17, and the reference signal is input through a reference output end 25 to a reference signal input end 28 through an electric control 10dB step attenuator 20, an electric control phase shifter 19 and an electric control 1dB step attenuator 18.
The standard digital code element generator 46 can generate standard code elements (including digital phase shift, attenuation, noise and the like) for checking the correctness of optical fiber transmission and data acquisition and verifying the correctness of the analysis and processing algorithm of the output data of the receiving channel. The standard digital code element generator 46 comprises a control module 47, a main control computer 48, a recording module 49, an interface module 50, a code element simulation module 51, a digital noise simulation module 52 and an optical fiber 53, wherein the control module 47 receives a control command and parameters of the main control computer 48, and controls and processes data of the code element simulation module 51 and the like through a VPX bus; the code element simulation module 51 generates a digital T/R component output standard code element signal according to the control module transmission command and transmits the standard code element signal to the interface module 50; the digital noise simulation module 52 generates a digital noise signal and transmits the digital noise signal to the interface module 50; the interface module 50 packages the standard code element signals and the digital noise signals, outputs the data to the radio frequency digital T/R assembly comprehensive test system through the optical fiber 53, and calibrates the performance of the test system; recording module 49 performs recording analysis on the interface module 50 output signal for testing and scaling the standard symbol signal, digital noise signal output data.
A calibration method of a radio frequency digital T/R component comprehensive test system comprises the steps of calibrating the transmitting pulse power of the radio frequency digital T/R component comprehensive test system, calibrating a transmitting analog amplitude phase, calibrating a receiving analog amplitude phase, calibrating the consistency of the receiving digital amplitude phase and verifying the digital performance.
Step 1, calibrating the transmitted pulse power, namely calibrating the pulse power by using a directional coupler and adopting a coupling ratio method. The integrated test system 1 for the radio frequency digital T/R component comprises a signal center 2, a power meter 3, a signal generator A4 and a signal generator B5, wherein the output of the digital T/R component 8 is connected with the input end of a directional coupler 7, a sampling signal of a coupling end 12 of the directional coupler 7 is measured by a standard pulse power meter 6 (the power ratio of the directional coupler is set as the bias of the power meter), and an output end 13 of the directional coupler 7 is connected with the test end of the integrated test system 1 for the radio frequency digital T/R component. The excitation signal is the medium-high pulse power output by the digital T/R component 8.
Step 1.1, calibration preparation
The comprehensive test system 1 of the radio frequency digital T/R component and the pulse power meter 6 (comprising a power sensor) are connected with a power supply for preheating for half an hour according to the requirements of an instrument specification; and calibrating the power coupling ratio of the directional coupler by adopting a vector network analyzer.
Step 1.2, pulse Power calibration
In calibration, the excitation signal is the medium-high pulse power output by the digital T/R component 8. The output of the digital T/R component 8 is connected with the input end of the directional coupler 7, the sampling signal of the coupling end 12 of the directional coupler 7 is measured by the standard pulse power meter 6 (the power ratio of the directional coupler is set as the bias of the power meter) and is used as a reference standard value, the output end 13 of the directional coupler 7 is connected with the testing end of the radio frequency digital T/R component comprehensive testing system 1, and the measured value of the testing system 1 is compared with the reference standard value to calibrate the transmitting pulse power.
And 2, calibrating the transmission simulation amplitude and phase by using a multichannel transmission standard device 15 and adopting a transmission method.
The multi-channel transfer standard device 15 used in the method comprises: the power divider 16, a one-to-eight load switch 17, an electric control 1dB step attenuator 18, an electric control phase shifter 19, an electric control 10dB step attenuator 20, a control board 21, one end 22 of the power divider, a switch end 23, a transmission standard ToutRin port 24, a reference output end 25, a LAN port 26, a power supply 27, a reference input end 28, two ends 29 of the power divider and a signal input end 30. The control board 21 performs state control on the one-to-eight load switch 17, the electric control phase shifter 19, the electric control 1dB step attenuator 18 and the electric control 10dB step attenuator 20; for a transmitting path, a signal passes through a signal input end 30, is split into two parts through a power divider 16, wherein one end 22 of the power divider is in short circuit with a switch end 23 through a rigid cable, then is output to a transmission standard ToutRin port 24 after passing through an eight-branch load switch 17, is in short circuit with a reference input end 28 through a rigid cable, and then is transmitted to a reference output end 25 through an electric control 1dB step attenuator 18, an electric control phase shifter 19 and an electric control 10dB step attenuator 20; for the receiving path, the signal is input through a transmission standard toutirin port 24 to a switch end 23 through an eight-split load switch 17, and the reference signal is input through a reference output end 25 to a reference signal input end 28 through an electric control 10dB step attenuator 20, an electric control phase shifter 19 and an electric control 1dB step attenuator 18.
Step 2.1, calibration preparation
The comprehensive test system 1 of the radio frequency digital T/R component is powered on and preheated for half an hour; port1 and port2 of the standard vector network analyzer are connected to ports 30 and 25 of the multi-channel transmission standard device 15, and the attenuation amounts of the attenuators 18 and 20 and the phase amount of the phase shifter 19 are respectively changed to measure standard reference amplitude and phase values.
Step 2.2 calibration of emission simulation amplitude phase
The signal generator 4 (excitation source) in the integrated test system of the radio frequency digital T/R assembly provides a signal to be input into the signal input end 30 of the multi-channel transmission standard device 15, the transmission standard Toutrin Port 24 of the multi-channel transmission standard device 15 is correspondingly connected with the test Port of the signal center 2, namely the signal center Toutrin Port 34, the reference output end 25 of the multi-channel transmission standard device 15 is connected with the reference end 35 of the signal center 2, one end 22 of the power divider of the multi-channel transmission standard device 15 is in short circuit with the switch end 23 by a rigid cable, two ends 29 of the power divider are in short circuit with the reference input end 28 by a rigid cable, the Port1 and the Port2 of the network analyzer 31 are correspondingly connected with the Port1 end and the Port2 end of the signal center 2 as two receivers A and B, the two paths of signal amplitudes and the phase difference B/A of the reference channel and the transmission channel are measured, and the measured value is compared with the reference standard value to calibrate the transmission analog amplitude. Note that before analog phase calibration, the operating frequency range of the rf digital T/R device integrated test system is determined, and the electronically controlled phase shifter 19 in the multi-channel transfer standard device is selected according to the operating frequency range of the rf digital T/R device integrated test system. Wherein, the working frequency band of 7720A is 0.5 GHz-2.0 GHz, the working frequency band of 7722A is 2.0 GHz-6.0 GHz, and the working frequency band of 7728A is 6.0 GHz-18 GHz.
And 3, receiving analog amplitude and phase calibration, and calibrating the amplitude and the phase by using a multi-channel transmission standard device 15 by adopting a transmission method.
The multi-channel transfer standard device 15 used in the method comprises: the power divider 16, a one-to-eight load switch 17, an electric control 1dB step attenuator 18, an electric control phase shifter 19, an electric control 10dB step attenuator 20, a control board 21, one end 22 of the power divider, a switch end 23, a transmission standard ToutRin port 24, a reference output end 25, a LAN port 26, a power supply 27, a reference input end 28, two ends 29 of the power divider and a signal input end 30. The control board 21 performs state control on the one-to-eight load switch 17, the electric control phase shifter 19, the electric control 1dB step attenuator 18 and the electric control 10dB step attenuator 20; for a transmitting path, a signal passes through a signal input end 30, is split into two parts through a power divider 16, wherein one end 22 of the power divider is in short circuit with a switch end 23 through a rigid cable, then is output to a transmission standard ToutRin port 24 after passing through an eight-branch load switch 17, is in short circuit with a reference input end 28 through a rigid cable, and then is transmitted to a reference output end 25 through an electric control 1dB step attenuator 18, an electric control phase shifter 19 and an electric control 10dB step attenuator 20; for the receiving path, the signal is input through a transmission standard toutirin port 24 to a switch end 23 through an eight-split load switch 17, and the reference signal is input through a reference output end 25 to a reference signal input end 28 through an electric control 10dB step attenuator 20, an electric control phase shifter 19 and an electric control 1dB step attenuator 18.
Step 3.1, calibration preparation
The comprehensive test system 1 of the radio frequency digital T/R component is powered on and preheated for half an hour; the ports 1 and 2 of the standard vector network analyzer are connected to the ports 30 and 25 of the multi-channel transmission standard device 15, the attenuation amounts of the attenuators 18 and 20 and the phase amount of the electric control phase shifter 19 are respectively changed, and standard reference amplitude and phase values are measured.
Step 3.2, calibration of receiving analog amplitude phase
The signal generator 4 (excitation source) in the integrated test system of the radio frequency digital T/R assembly provides a signal input end 36 of the signal input signal center 2, the transmission standard ToutRin Port 24 of the multi-channel transmission standard device 15 is correspondingly connected with a test Port of the signal center 2, namely, the ToutRin Port 34, the reference output end 25 of the multi-channel transmission standard device 15 is connected with a reference end 35 of the signal center 2, the Port1 and the Port2 of the network analyzer 31 are used as two receivers A and B to be correspondingly connected with a switch end 23 and a reference input end 28 of the multi-channel transmission standard device 15, two paths of signal amplitude and phase difference value B/A of a reference channel and a receiving channel are measured, and the measured value is compared with the reference standard value to calibrate and receive analog amplitude phase. Note that before analog phase calibration, the operating frequency range of the rf digital T/R device integrated test system is determined, and the electronically controlled phase shifter 19 in the multi-channel transfer standard device is selected according to the operating frequency range of the rf digital T/R device integrated test system. Wherein, the working frequency band of 7720A is 0.5 GHz-2.0 GHz, the working frequency band of 7722A is 2.0 GHz-6.0 GHz, and the working frequency band of 7728A is 6.0 GHz-18 GHz.
And 4, calibrating the consistency of the received digital amplitude, and calibrating the consistency of the received digital amplitude by using a standard analog part (a low-power attenuator and a phase shifter) by using an insertion method.
Step 4.1, calibration preparation
The comprehensive test system 1 of the radio frequency digital T/R component and the reference digital T/R component are connected with a power supply to preheat for half an hour; standard reference amplitude and phase values are measured for standard analog components (low power attenuators, phase shifters) with a standard vector network analyzer.
Step 4.2, calibration of received digital amplitude phase consistency
Any one of 1-8 paths of reference number T/R assembly 40 (reference piece) is required to be selected as amplitude and phase reference, and relatively stable number T/R assembly 8 is required to be used as a measured piece. The signal generator 4 in the test system provides an excitation signal, the signal end of the signal center 2 is connected, the calibrated standard analog element (low-power attenuator and phase shifter) is connected to the reference end 35 of the signal center 2 and the receiving path of the reference number T/R assembly 40, and the signal center Toutrin end 34 of the signal center 2 is correspondingly connected with the receiving path of the tested number T/R assembly 8. The output signals of the tested digital T/R component 8 and the reference digital T/R component 40 enter the radio frequency digital T/R component comprehensive test system 1 through the digital T/R component optical port 43 and the reference digital T/R component optical port 42, the test system data processing software analyzes the signals to obtain test results, and the test results are compared with standard reference values to calibrate the consistency of the received digital frames.
And 5, verifying the digital performance of the system by adopting a standard digital code element generator.
The standard digital symbol generator 46 used in this method includes: the control module 47, the main control computer 48, the recording module 49, the interface module 50, the code element simulation module 51, the digital noise simulation module 52 and the optical fiber 53, wherein the control module 47 receives the control command and the parameters of the main control computer 48, and controls and processes the data of the code element simulation module 51 and the like through the VPX bus; the code element simulation module 51 generates a digital T/R component output standard code element signal according to the control module transmission command and transmits the standard code element signal to the interface module 50; the digital noise simulation module 52 generates a digital noise signal and transmits the digital noise signal to the interface module 50; the interface module 50 packages the standard code element signals and the digital noise signals, outputs the data to the radio frequency digital T/R assembly comprehensive test system through the optical fiber 53, and calibrates the performance of the test system; recording module 49 performs recording analysis on the interface module 50 output signal for testing and scaling the standard symbol signal, digital noise signal output data.
Step 5.1, calibration preparation
The RF digital T/R assembly integrated test system 1, standard digital symbol generator 46, is powered on and preheated for half an hour.
Step 5.2 verification of digital Performance
After data packaging is performed on the standard code element signals and the digital noise signals, the data packaging is output to the radio frequency digital T/R component comprehensive test system through the optical fiber 53 for testing, and the recording module 49 is used for recording and analyzing the output signals of the interface module 50 and is used for calibrating the output data of the standard code element signals and the digital noise signals. And comparing the test signal with the calibration signal to calibrate the performance of the test system.
The beneficial effects of the invention are as follows:
aiming at the problems of heavy task, complex test system, high test requirement, poor test consistency, difficult traceability of problems and the like faced by radar T/R production line measurement, the problems of in-situ integral quantity transmission of a digital T/R component test system are solved by the research of a metering method and a transmission standard device and the simulation calculation of digital signals and by combining informatization and automation means, and the on-site integral calibration of the digital test system is realized. The method is applied to a digital T/R assembly digital test system for scientific research production, realizes the integral calibration of the test system, reduces the production line downtime, and improves the production efficiency; a rapid fault diagnosis means of the test system is provided, and the metering efficiency and the meter utilization rate are improved; the reliability of the performance of the test system is ensured. The method has profound significance for pushing the automatic work of engineering debugging and testing of the radio frequency microwave digital measurement production line, and has general guiding significance for the research of the calibration technology of other integrated systems of the radio frequency microwave digital measurement production line.
Drawings
FIG. 1 pulse power calibration graph
Fig. 2 multiple channel transfer standard device
FIG. 3 is a diagram of analog received amplitude and phase calibration
FIG. 4 is a simulated emission amplitude-phase calibration chart
FIG. 5 digital received amplitude phase consistency calibration chart
FIG. 6 digital Performance verification graph
1. The system comprises a radio frequency digital T/R assembly comprehensive test system 2, a signal center 3, a power meter 4, a signal generator A5, a signal generator B6, a pulse power meter 7, a directional coupler 8, a digital T/R assembly 9, a digital T/R assembly clock end 10, a digital T/R assembly matrix end 11, a digital T/R assembly clock end 12, a directional coupler forward coupling end 13, a directional coupler output end 14, a signal center power meter end 15, a multi-channel transfer standard device 16, a power divider 17, a one-division eight-load switch 18, an electric control 1dB step attenuator 19, an electric control phase shifter 20, and an electric control 10 dB. Step attenuator 21, control board 22, power divider end 23, switch end 24, pass standard touttrin Port 25, reference output end 26, lan Port 27, power supply 28, reference input end 29, power divider end 30, signal input end 31, vector network analyzer 32, power divider 33, divide-by-eight power divider 34, signal center touttrin Port 35, signal center reference end 36, signal center signal input end 37, divide-by-eight switch 38, network analyzer Port1 end 39, network analyzer Port2 end 40, reference number T/R assembly 41, standard analog (small power attenuator ) Phase shifter) 42, reference numeral T/R component optical port 43, digital T/R component optical port 44, data acquisition card optical port A45, data acquisition card optical port B46, standard digital symbol generator 47, control module 48, main control computer 49, recording module 50, interface module 51, symbol simulation module 52, digital noise simulation module 53, optical fiber
Detailed Description
The technical scheme provided by the present invention will be described in detail with reference to the following specific examples, and it should be understood that the following specific examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
The calibration technology of the radio frequency digital T/R assembly comprehensive test system 1 uses a directional coupler to calibrate pulse power by adopting a coupling ratio method; a multi-channel transmission standard device is built, and a transmission method is adopted to calibrate the analog quantity of the test system; using standard analog parts (low-power attenuator and phase shifter), and adopting an insertion method to calibrate the digital quantity of the test system; and (3) a standard digital code element generator is developed to verify the digital performance of the test system.
The pulse power is calibrated by using a directional coupler and adopting a coupling ratio method, as shown in figure 1, and the pulse power of the integrated test system 1 of the radio frequency digital T/R component is measured. The integrated test system 1 for the radio frequency digital T/R component comprises a signal center 2, a power meter 3, a signal generator A4 and a signal generator B5, wherein the output of the digital T/R component 8 is connected with the input end of a directional coupler 7, a sampling signal of a coupling end 12 of the directional coupler 7 is measured by a standard pulse power meter 6 (the power ratio of the directional coupler is set as the bias of the power meter), and an output end 13 of the directional coupler 7 is connected with the test end of the integrated test system 1 for the radio frequency digital T/R component. The excitation signal is the medium-high pulse power output by the digital T/R component 8. The comprehensive test system 1 of the radio frequency digital T/R component and the pulse power meter 6 (comprising a power sensor) are powered on and preheated for half an hour according to the requirements of the instruction manual of the instrument and equipment. During calibration, the output of the digital T/R component 8 is connected with the input end of the directional coupler 7, the sampling signal of the coupling end 12 of the directional coupler 7 is measured by the standard pulse power meter 6 (the power ratio of the directional coupler is set as the bias of the power meter), and the output end 13 of the directional coupler 7 is connected with the test end of the radio frequency digital T/R component comprehensive test system 1.
A multi-channel transfer standard device 15 is developed, as shown in fig. 2, and includes a power divider 16, a one-to-eight load switch 17, an electrically controlled 1dB step attenuator 18, an electrically controlled phase shifter 19, an electrically controlled 10dB step attenuator 20, a control board 21, a power divider end 22, a switch end 23, a transfer standard toutirin port 24, a reference output end 25, a LAN port 26, a power supply 27, a reference input end 28, a power divider end 29, and a signal input end 30. The control board 21 performs state control on the one-to-eight load switch 17, the electric control phase shifter 19, the electric control 1dB step attenuator 18 and the electric control 10dB step attenuator 20; for a transmitting path, a signal passes through a signal input end 30, is split into two parts through a power divider 16, wherein one end 22 of the power divider is in short circuit with a switch end 23 through a rigid cable, then is output to a port ToutRin port 24 after passing through an eight-branch load switch 17, is in short circuit with a reference input end 28 through a rigid cable, and then is transmitted to a reference output end 25 through an electric control 1dB step attenuator 18, an electric control phase shifter 19 and an electric control 10dB step attenuator 20; for the receive path, the signal is input through the ToutRin port 24 to the switch end 23 via the one-to-eight load switch 17, and the reference signal is input through the reference output end 25 to the reference signal input end 28 via the electrically controlled 10dB step attenuator 20, the electrically controlled phase shifter 19, and the electrically controlled 1dB step attenuator 18.
The multi-channel transfer standard device 15 is used for receiving analog amplitude phase calibration by a transfer method, as shown in fig. 3. Before calibration, the radio frequency digital T/R assembly comprehensive test system 1 is powered on and preheated for half an hour; the receiving and transmitting ports of the standard vector network analyzer are connected to the ports 30 and 25 of the multi-channel transmission standard device 15, full two-port calibration is performed, the attenuation amounts of the attenuators 18 and 20 and the phase amount of the phase shifter 19 are respectively changed, and the amplitude value and the phase value are measured and used as standard reference values. During calibration, the analog amplitude and phase calibration of the integrated test system 1 of the radio frequency digital T/R assembly is mainly completed through a network analyzer 31 in the system, the integrated test system 1 of the radio frequency digital T/R assembly is calibrated through two ports, mismatch errors are reduced, and the connection mode of the automatic calibration of the analog receiving path amplitude of the test system is shown in figure 3. The analog receiving calibration system of the radio frequency digital T/R component integrated test system 1 comprises a multichannel transmission standard device 15, a signal generator 4 (an excitation source) in the radio frequency digital T/R component integrated test system 1 provides a signal input end 36 of a signal input signal center 2, a Toutrin Port 24 of the multichannel transmission standard device 15 is correspondingly connected with a test Port (Toutrin) 34 of the signal center 2, a reference output end 25 of the multichannel transmission standard device 15 is connected with a reference end 35 of the signal center 2, port1 and Port2 of a network analyzer 31 are correspondingly connected with a switch end 23 and a reference input end 28 of the multichannel transmission standard device 15 as two receivers A and B, and two paths of signal amplitude differences and phase differences B/A of a reference channel and a receiving channel are measured. The measured value is compared with a reference standard value to calibrate the received analog amplitude phase. Note that prior to analog phase calibration, the operating frequency range of the test system is determined, and the electronically controlled phase shifter 19 in the multi-channel transfer standard device 15 is selected based on the operating frequency range of the rf digital T/R assembly integrated test system 1. Wherein, the working frequency band of 7720A is 0.5 GHz-2.0 GHz, the working frequency band of 7722A is 2.0 GHz-6.0 GHz, and the working frequency band of 7728A is 6.0 GHz-18 GHz.
The transmission analog amplitude phase calibration is performed by using a multi-channel transmission standard device 15 by using a transmission method, as shown in fig. 4. Before calibration, the radio frequency digital T/R assembly comprehensive test system 1 is powered on and preheated for half an hour; the receiving and transmitting ports of the standard vector network analyzer are connected to the ports 30 and 25 of the multi-channel transmission standard device 15, full two-port calibration is performed, the attenuation amounts of the attenuators 18 and 20 and the phase amount of the phase shifter 19 are respectively changed, and the amplitude value and the phase value are measured and used as standard reference values. During calibration, the analog amplitude calibration of the radio frequency digital T/R component comprehensive test system 1 is mainly completed through a network analyzer 31 in the system, the radio frequency digital T/R component comprehensive test system 1 is calibrated through two ports, mismatch errors are reduced, and the wiring mode of the automatic calibration of the analog transmission path amplitude of the test system is shown in figure 4. The analog emission calibration system of the radio frequency digital T/R component integrated test system 1 comprises a multichannel transmission standard device 15, a signal generator 4 (an excitation source) in the radio frequency digital T/R component integrated test system 1 provides a signal input end 30 of the multichannel transmission standard device 15, a Toutrin Port 24 of the multichannel transmission standard device 15 is correspondingly connected with a test Port (Toutrin) 34 of a signal center 2, a reference output end 25 of the multichannel transmission standard device 15 is connected with a reference end 35 of the signal center 2, one end 22 of a power divider of the multichannel transmission standard device 15 is in short circuit with a switch end 23 by a rigid cable, two ends 29 of the power divider are in short circuit with a reference input end 28 by a rigid cable, a Port1 and a Port2 of a network analyzer 31 are correspondingly connected with a Port1 end and a Port2 end of the signal center 2 as two receivers A and B, and a two-way signal amplitude difference B/A of a reference channel and a transmitting channel is measured. The measured value is compared with a reference standard value to calibrate the received analog amplitude phase. Before analog phase calibration, the operating frequency range of the test system is determined, and the electronically controlled phase shifter 19 in the multi-channel transfer standard device is selected according to the operating frequency range of the test system. Wherein, the working frequency band of 7720A is 0.5 GHz-2.0 GHz, the working frequency band of 7722A is 2.0 GHz-6.0 GHz, and the working frequency band of 7728A is 6.0 GHz-18 GHz.
The standard analog component 41 is used to convert the calibrated analog quantity into a digital quantity by an insertion method, so as to perform digital receiving amplitude consistency calibration of the integrated test system 1 of the radio frequency digital T/R assembly, as shown in fig. 5. Before calibration, the radio frequency digital T/R assembly comprehensive test system 1 and the reference digital T/R assembly 40 are connected with a power supply to preheat for half an hour; standard reference amplitude and phase values are measured for standard analog components (low power attenuators, phase shifters) with a standard vector network analyzer. During calibration, any one of 1-8 paths in a reference number T/R assembly 40 (a reference piece) is required to be selected as amplitude and phase references, and a relatively stable number T/R assembly 8 is required to be used as a measured piece. The signal generator 4 in the test system provides an excitation signal, the signal end of the signal center 2 is connected, the calibrated standard analog element (low-power attenuator and phase shifter) is connected to the reference end 35 of the signal center 2 and the receiving path of the reference number T/R assembly 40, and the signal center Toutrin end 34 of the signal center 2 is correspondingly connected with the receiving path of the tested number T/R assembly 8. The output signals of the tested digital T/R component 8 and the reference digital T/R component 40 enter the radio frequency digital T/R component comprehensive test system 1 through the digital T/R component optical port 43 and the reference digital T/R component optical port 42, the test system data processing software analyzes the signals to obtain test results, and the test results are compared with standard reference values to calibrate the consistency of the received digital frames.
The standard digital symbol generator 46 verifies the digital performance of the test system as shown in fig. 6. The standard digital code element generator 46 comprises a control module 47, a main control computer 48, a recording module 49, an interface module 50, a code element simulation module 51, a digital noise simulation module 52 and an optical fiber 53, wherein the control module 47 receives a control command and parameters of the main control computer 48, and controls and processes data of the code element simulation module 51 and the like through a VPX bus; the code element simulation module 51 generates a digital T/R component output standard code element signal according to the control module transmission command and transmits the standard code element signal to the interface module 50; the digital noise simulation module 52 generates a digital noise signal and transmits the digital noise signal to the interface module 50; the interface module 50 performs data package on the standard code element signals and the digital noise signals, outputs the data package to the radio frequency digital T/R assembly comprehensive test system 1 through the optical fiber 53 for testing, and the recording module 49 performs recording analysis on the output signals of the interface module 50 and is used for calibrating the output data of the standard code element signals and the digital noise signals, and performs consistency comparison on the test data results and the calibration data results to realize verification on the digital performance of the test system.
The foregoing is merely illustrative of the best embodiments of the present invention, and the present invention is not limited thereto, but any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be construed as falling within the scope of the present invention.
What is not described in detail in the present specification belongs to the known technology of those skilled in the art.
Claims (2)
1. A calibration system for a radio frequency digital T/R assembly integrated test system, the system comprising: a directional coupler, a pulse power meter, a multi-channel transmission standard device, a standard analog component and a standard digital code element generator; the standard analog component comprises a low-power attenuator and a phase shifter; the high power in the test system pulse is calibrated by using a directional coupler and adopting a coupling ratio method; using a multi-channel transmission standard device, and calibrating the transmitting and receiving analog quantity of the test system by adopting a transmission method; using a standard simulation part, and calibrating the digital amplitude consistency of the receiving channel of the test system by an insertion method; verifying the digital performance of the test system by using a standard digital code element generator;
the multi-channel transmission standard device (15) comprises a power divider (16), a one-to-eight load switch (17), an electric control 1dB step attenuator (18), an electric control phase shifter (19), an electric control 10dB step attenuator (20), a control board (21), one end (22) of the power divider, a switch end (23), a transmission standard Toutrin port (24), a reference output end (25), a LAN port (26), a power supply (27), a reference input end (28), two ends (29) of the power divider and a signal input end (30); the control board (21) performs state control on the one-to-eight load switch (17), the electric control phase shifter (19), the electric control 1dB step attenuator (18) and the electric control 10dB step attenuator (20); for a transmitting path, a signal passes through a signal input end (30), is split into two parts through a power divider (16), wherein one end (22) of the power divider is in short circuit with a switch end (23) through a rigid cable, then is output to a transmission standard ToutRin port (24) after passing through an eight-branch load switch (17), is in short circuit with a reference input end (28) through a rigid cable, and then is transmitted to a reference output end (25) through an electric control 1dB step attenuator (18), an electric control phase shifter (19) and an electric control 10dB step attenuator (20); for a receiving passage, a signal is input to a switch end (23) through a transmission standard Toutrin port (24) through an eight-split load switch (17), and a reference signal is input to a reference signal input end (28) through a reference output end (25) through an electric control 10dB step attenuator (20), an electric control phase shifter (19) and an electric control 1dB step attenuator (18);
a standard digital code element generator (46) which can generate standard code elements, wherein the standard code elements comprise digital phase shift, attenuation and noise and are used for checking the correctness of optical fiber transmission and data acquisition and verifying the correctness of the analysis and processing algorithm of the output data of the receiving channel; the standard digital code element generator (46) comprises a control module (47), a main control computer (48), a recording module (49), an interface module (50), a code element simulation module (51), a digital noise simulation module (52) and an optical fiber (53), wherein the control module (47) receives a control command and parameters of the main control computer (48) and controls and processes data of the code element simulation module (51) through a VPX bus; the code element simulation module (51) generates a digital T/R assembly to output a standard code element signal according to the command transmitted by the control module and transmits the standard code element signal to the interface module (50); the digital noise simulation module (52) generates a digital noise signal and transmits the digital noise signal to the interface module (50); the interface module (50) packages the standard code element signals and the digital noise signals, outputs the data to the radio frequency digital T/R assembly comprehensive test system through the optical fiber (53), and calibrates the performance of the test system; the recording module (49) performs recording analysis on the output signal of the interface module (50) and is used for testing and scaling the output data of the standard code element signal and the digital noise signal.
2. A calibration method based on the calibration system of claim 1, characterized in that the method comprises calibration of the transmit pulse power of the integrated test system of the radio frequency digital T/R assembly, calibration of the transmit analog amplitude phase, calibration of the receive analog amplitude phase, calibration of the consistency of the receive digital amplitude phase, and verification of the digital performance;
step 1, calibrating the transmitted pulse power, namely calibrating the pulse power by using a directional coupler by adopting a coupling ratio method; the radio frequency digital T/R component comprehensive test system (1) comprises a signal center (2), a power meter (3), a signal generator A (4) and a signal generator B (5), wherein the output of the digital T/R component (8) is connected with the input end of a directional coupler (7), a sampling signal of a coupling end (12) of the directional coupler (7) is measured by a standard pulse power meter (6), the power ratio of the directional coupler is set as the bias of the power meter, and the output end (13) of the directional coupler (7) is connected with the test end of the radio frequency digital T/R component comprehensive test system (1); the excitation signal is the medium-high pulse power output by the digital T/R component (8);
the step 1 specifically comprises the following steps:
step 1.1, calibration preparation
The system comprises a radio frequency digital T/R assembly comprehensive test system (1) and a pulse power meter (6), wherein the pulse power meter comprises a power sensor, and a power supply is connected for preheating for half an hour according to the requirements of an instrument specification; calibrating the power coupling ratio of the directional coupler by adopting a vector network analyzer;
step 1.2, pulse Power calibration
When in calibration, the excitation signal is the medium-high pulse power output by the digital T/R component (8); the output of the digital T/R component (8) is connected with the input end of the directional coupler (7), a sampling signal of the coupling end (12) of the directional coupler (7) is measured by the standard pulse power meter (6) to be used as a reference standard value, the power ratio of the directional coupler is set as the bias of the power meter, the output end (13) of the directional coupler (7) is connected with the test end of the radio frequency digital T/R component comprehensive test system (1), and the measured value of the test system (1) is compared with the reference standard value to calibrate the transmitted pulse power;
step 2, calibrating the emission simulation amplitude and phase, namely calibrating the amplitude and the phase by using a multichannel transmission standard device (15) through a transmission method;
the step 2 is specifically as follows:
step 2.1, calibration preparation
The comprehensive test system (1) of the radio frequency digital T/R component is powered on and preheated for half an hour; connecting a port1 and a port2 of a standard vector network analyzer with a signal input end (30) and a reference output end (25) of a multi-channel transmission standard device (15), respectively changing attenuation amounts of attenuators ((19)), (20) and phase amounts of a phase shifter 19, and measuring standard reference amplitude and phase values;
step 2.2 calibration of emission simulation amplitude phase
A signal generator 4 in a radio frequency digital T/R assembly comprehensive test system provides a signal input end (30) of a multichannel transmission standard device (15), a transmission standard ToutRin Port (24) of the multichannel transmission standard device (15) is correspondingly connected with a test Port of a signal center (2), namely a signal center ToutRin Port (34), a reference output end (25) of the multichannel transmission standard device (15) is connected with a reference end (35) of the signal center (2), one end (22) of a power divider of the multichannel transmission standard device (15) is in short circuit with a switch end (23) by a rigid cable, two ends (29) of the power divider are in short circuit with a reference input end (28) by a rigid cable, port1 and Port2 of a network analyzer (31) are correspondingly connected with a Port1 end and a Port2 end of the signal center (2), two paths of signal amplitudes and phase difference values B/A of a reference channel and a transmitting channel are measured, an actual measurement value is compared with a reference standard value, and an analog transmission amplitude is calibrated; note that before analog phase calibration, the working frequency range of the radio frequency digital T/R component comprehensive test system is required to be determined, and an electric control phase shifter (19) in the multichannel transmission standard device is selected according to the working frequency range of the radio frequency digital T/R component comprehensive test system; wherein, the working frequency band of 7720A is 0.5 GHz-2.0 GHz, the working frequency band of 7722A is 2.0 GHz-6.0 GHz, and the working frequency band of 7728A is 6.0 GHz-18 GHz;
step 3, receiving analog amplitude and phase calibration, and calibrating the amplitude and the phase by using a multichannel transmission standard device (15) through a transmission method;
the step 3 is specifically as follows:
step 3.1, calibration preparation
The comprehensive test system (1) of the radio frequency digital T/R component is powered on and preheated for half an hour; connecting a port1 and a port2 of a standard vector network analyzer with a signal input end (30) and a reference output end (25) of a multi-channel transmission standard device (15), respectively changing the attenuation amount of an electric control 1dB step attenuator (18), an electric control 10dB step attenuator (20) and the phase amount of an electric control phase shifter (19), and measuring standard reference amplitude and phase values;
step 3.2, calibration of receiving analog amplitude phase
A signal generator 4 in the radio frequency digital T/R assembly comprehensive test system provides a signal input end (36) of a signal input signal center (2), a transmission standard ToutRin Port (24) of a multi-channel transmission standard device (15) is correspondingly connected with a test Port of the signal center (2), namely a ToutRin Port (34), a reference output end (25) of the multi-channel transmission standard device (15) is connected with a reference end (35) of the signal center (2), port1 and Port2 of a network analyzer (31) are correspondingly connected with a switch end (23) and a reference input end (28) of the multi-channel transmission standard device (15) as two receivers A and B, two paths of signal amplitude and phase difference B/A of a reference channel and a receiving channel are measured, and the measured value is compared with a reference standard value to calibrate a receiving analog amplitude; note that before analog phase calibration, the working frequency range of the radio frequency digital T/R component comprehensive test system is required to be determined, and an electric control phase shifter (19) in the multichannel transmission standard device is selected according to the working frequency range of the radio frequency digital T/R component comprehensive test system; wherein, the working frequency band of 7720A is 0.5 GHz-2.0 GHz, the working frequency band of 7722A is 2.0 GHz-6.0 GHz, and the working frequency band of 7728A is 6.0 GHz-18 GHz;
step 4, calibrating the consistency of the received digital frames, namely calibrating the consistency of the received digital frames by using a standard simulation part through an insertion method; the standard analog component comprises a low-power attenuator and a phase shifter;
the step 4 is specifically as follows:
step 4.1, calibration preparation
The comprehensive test system (1) of the radio frequency digital T/R component and the reference digital T/R component are connected with a power supply to preheat for half an hour; measuring standard reference amplitude and phase values of a standard analog part by using a standard vector network analyzer; the standard analog component comprises a low-power attenuator and a phase shifter;
step 4.2, calibration of received digital amplitude phase consistency
Any one of 1-8 paths in a reference number T/R assembly (40) is required to be selected as amplitude and phase references, and a relatively stable number T/R assembly (8) is required to be used as a tested piece; providing an excitation signal by a signal generator 4 in a test system, accessing a signal end of a signal center (2), accessing a calibrated standard analog part into a receiving channel of a reference digital T/R assembly (40) and a reference end (35) of the signal center (2), and correspondingly connecting a signal center Toutrin end (34) of the signal center (2) with the receiving channel of a tested digital T/R assembly (8); the output signals of the tested digital T/R component (8) and the reference digital T/R component (40) enter the radio frequency digital T/R component comprehensive test system (1) through the digital T/R component optical port (43) and the reference digital T/R component optical port (42), the test result is obtained by analysis in test system data processing software, and the test result is compared with a standard reference value to calibrate the consistency of the received digital amplitude;
step 5, verifying the digital performance of the system by adopting a standard digital code element generator;
the step 5 is specifically as follows:
step 5.1, calibration preparation
The comprehensive test system (1) of the radio frequency digital T/R assembly and the standard digital code element generator (46) are connected with a power supply to preheat for half an hour;
step 5.2 verification of digital Performance
After data packaging is carried out on the standard code element signals and the digital noise signals, the data packaging is output to a radio frequency digital T/R assembly comprehensive test system through an optical fiber (53) for testing, and a recording module (49) is used for recording and analyzing the output signals of the interface module (50) and is used for calibrating the output data of the standard code element signals and the digital noise signals; and comparing the test signal with the calibration signal to calibrate the performance of the test system.
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