CN115061104A

CN115061104A - Calibration technology of radio frequency digital T/R assembly test system

Info

Publication number: CN115061104A
Application number: CN202210650300.9A
Authority: CN
Inventors: 杨忠; 楼红英; 陈效杰; 沈保龙; 金成�
Original assignee: CETC 14 Research Institute
Current assignee: CETC 14 Research Institute
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-09-16

Abstract

The invention discloses a calibration technology of a radio frequency digital T/R assembly test system, which uses a directional coupler and adopts a coupling ratio method to calibrate pulse power; calibrating system analog quantity by using a multi-channel transmission standard device; calibrating the system digital quantity by using a standard analog piece and adopting an interpolation method; the digital code element generator is used for verifying the digital performance of the system, realizing the field integral calibration of the digital test system, solving the calibration problem of analog quantity and digital quantity of the test system, ensuring the accuracy and effectiveness of amplitude and phase quantity transmission, simultaneously verifying the reliability of time sequence and synchronization of the test system, improving the metering efficiency and the utilization rate of instruments and having general guiding significance for the calibration technology research of other integrated systems of a radio frequency microwave digital measurement production line.

Description

Calibration technology of radio frequency digital T/R assembly test system

Technical Field

The invention belongs to the technical field of microwave measurement, and particularly relates to a device calibration technology.

Background

The radio frequency microwave digital test system mainly integrates and conditions a plurality of instruments with different functions, such as a signal generator, a pulse power meter (a power sensor), a vector network analyzer (a noise option is optional), a control and data acquisition device 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.

The frequency range of the test system is applied to several bands simultaneously, such as part of the P-band, S-band, X-band. Through the research of the calibration technology of the digital test system, the field automatic calibration problem of the digital radio frequency microwave test system is solved, the mass transfer capability coverage rate of special test equipment is improved, and the metering guarantee capability of military products is improved.

The existing domestic measurement standards carry out measurement work aiming at analog quantity, and can solve the problem of quantity transmission of analog quantity parameters such as power, amplitude, phase and the like of a test system. For each parameter of digital quantity of a test system, no method is available at present for carrying out quantity transmission work of related parameters, and the accuracy and reliability of quantity transmission cannot be guaranteed. Therefore, the research on the calibration technology of the test system is urgently needed to be developed, and the problem of the overall calibration of the radio frequency microwave digital test system is solved.

Disclosure of Invention

Aiming at solving the problems existing in the core component of the digital array radar in the prior art, the invention provides a calibration technology of a radio frequency digital T/R component test system, and the invention solves the requirements of measurement accuracy and magnitude traceability.

Calibrating pulse power by using a directional coupler and adopting a coupling ratio method; calibrating system analog quantity by using a multi-channel transmission standard device; calibrating the digital quantity of the system by using a standard analog piece and adopting an interpolation method; the digital performance of the system is verified using a digital symbol generator.

Calibrating pulse power: the output end of the tested digital T/R component is connected with the input end of the directional coupler, the coupling end of the directional coupler is connected with the standard pulse power meter, the output end of the directional coupler is connected with the signal center of the test system, the coupling power ratio of the directional coupler is set to be the bias of the standard pulse power meter, and the standard pulse power meter measures the sampling signal of the directional coupler.

Multichannel transmission standard device: the control panel controls the states of the load switch, the electric control phase shifter and the electric control attenuator, a transmitting signal passes through a signal input end and is divided into two parts by the power divider, one end of the power divider is in short circuit with a switch end through a rigid cable, the other end of the power divider is divided into eight parts by the load switch and is output through a TouT/Rin port, two ends of the power divider are in short circuit with a reference input end through a rigid cable, the two ends of the power divider sequentially pass through the electric control 1dB step attenuator, the electric control phase shifter and the electric control 10dB step attenuator and are output through a reference output end, a receiving signal is input through the TouT/Rin port and is input into the switch end through the load switch, the reference signal is input into the reference output end, and the reference signal is input into the reference input end sequentially through the electric control 10dB step attenuator, the electric control phase shifter and the electric control 1dB step attenuator.

The calibration system receives analog quantity: a signal generator of the test system inputs an excitation signal to a signal source end of a signal center, a TouT/Rin Port of a multi-channel transmission standard device is connected with a test Port of the signal center, a reference output end is connected with a reference end of the signal center, a Port1 of a network analyzer is connected with a reference input end, a Port2 of the network analyzer is connected with a switch end, an electric control attenuator and an electric control phase shifter are adjusted according to a working frequency range of the test system, a difference B/A of two signal amplitudes of a reference channel and a receiving channel is measured, and the analog amplitude and the phase of the tested system are automatically calibrated through the two ports.

The calibration system transmits analog quantity: a signal generator of the test system inputs an excitation signal to a signal input end, a TouT/Rin Port of a multichannel transmission standard device is connected with a test Port of a signal center, a reference output end is connected with a reference end of the signal center, a Port1 of a network analyzer is connected with a Port1 end of the signal center, a Port2 of the network analyzer is connected with a Port2 end of the signal center, an electric control attenuator and an electric control phase shifter are adjusted according to a working frequency range of the test system, a difference value B/A of amplitudes and phases of two paths of signals of a reference channel and a receiving channel is measured, and the analog amplitude and the phase of the tested system are automatically calibrated through a whole two ports.

Calibrating system digital quantity: the signal generator inputs an excitation signal to the signal center, the reference end is connected with the reference digital T/R component through the standard analog component, the test port is connected with the tested digital T/R component, the reference digital T/R component outputs a signal through the optical port of the reference digital T/R component, the amplitude and the phase of any one of 1-8 paths are selected as a reference, and the tested digital T/R component outputs a signal through the optical port of the tested digital T/R component and collects the signal as a test.

Verifying the digital performance of the system: the main control computer processes commands through a control module, a control interface module, a code element simulation module and a digital noise simulation module through a VPX bus, the code element simulation module generates a digital T/R component standard code element signal, the digital noise simulation module generates a digital noise signal, the code element signal and the noise signal are input into the interface module for packaging, the code element signal and the noise signal are input into a test system for calibration through an optical fiber, and a recording module analyzes signals output by the interface module and is used for data test and calibration.

The invention has the beneficial effects that: aiming at the problems of heavy task, complex test system, high test requirement, poor test consistency, difficult problem tracing and the like faced by the measurement of a radar T/R production line, the problem of in-situ whole mass transfer of a radio frequency microwave digital test system is solved by means of a metering method, the research of transmission standard, the simulation calculation of digital signals and the combination of informatization and automation measures, and the field whole calibration of the digital test system is realized; the method comprises the following steps of developing calibration technology research works of analog quantity transmission parameter power, amplitude, phase and the like of digital test systems of different frequency bands and different types, developing a multi-channel transmission standard device to form a standard simulation piece, developing error analysis and correction technology research of a broadband standard simulation piece in different joint forms, evaluating and verifying repeatability and stability of the standard simulation piece and uncertainty, and solving the calibration problem of analog quantity of 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, generating a standard code element by adopting the standard digital code element generator, wherein the standard code element generator contains digital phase shift, attenuation, noise and the like, checking the correctness of optical fiber transmission, a data acquisition card/recording device and analyzing and processing algorithm correctness of output data of a receiving channel; the method comprises the following steps of developing a calibration technology research of digital amplitude and phase of a test system, utilizing a standard analog part to be matched with a relatively stable tested digital transceiver module to realize the calibration of the digital amplitude and phase of the test system, ensuring the accuracy and effectiveness of amplitude and phase transmission, and simultaneously verifying the reliability of the time sequence and synchronization of the test system; a rapid fault diagnosis means of a test system is provided, and the metering efficiency and the utilization rate of the instrument are improved; the method has the advantages of ensuring the reliable performance of the test system, having profound significance for promoting the radio frequency microwave digital measurement production line to carry out automation work of engineering debugging and testing, and having general guiding significance for the research of calibration technologies of other integrated systems of the radio frequency microwave digital measurement production line.

Drawings

Fig. 1 is a calibration pulse power diagram, fig. 2 is a diagram of a transfer standard device structure, fig. 3 is a calibration reception diagram, fig. 4 is a calibration transmission diagram, fig. 5 is a calibration digital diagram, and fig. 6 is a verification performance diagram.

Reference numerals: 1-test system, 2-signal center, 4-signal generator A, 6-standard pulse power meter, 7-directional coupler, 8-tested digital T/R component, 11-directional coupler input end, 12-directional coupler coupling end, 13-directional coupler output end, 15-transfer standard device, 16-power divider, 17-load switch, 18-electric control 1dB step attenuator, 19-electric control phase shifter, 20-electric control 10dB step attenuator, 21-control board, 22-one end, 23-switch end, 24-Tout/Rin port, 25-reference output end, 28-reference input end, 29-two ends, 30-signal input end, 31-network analyzer, 34-test port, 35-reference end, 36-signal source end, 38-Port1 end, 39-Port2 end, 40-reference number T/R component, 41-standard analog component, 42-tested number T/R component optical Port, 43-reference number T/R component optical Port, 46-code element generator, 47-control module, 48-master control computer, 49-recording module, 50-interface module, 51-code element simulation module, 52-digital noise simulation module and 53-optical fiber.

Detailed Description

The technical scheme of the invention is specifically explained in the following by combining the attached drawings.

Calibrating pulse power by using a directional coupler and adopting a coupling ratio method; calibrating system analog quantity by using a multi-channel transmission standard device; calibrating the system digital quantity by using a standard analog piece and adopting an interpolation method; the digital performance of the system is verified using a digital symbol generator.

And (3) calibrating the pulse power, as shown in fig. 1, the output end of the tested digital T/R component 8 is connected with the input end 11 of the directional coupler 7, the coupling end 12 of the directional coupler 7 is connected with the standard pulse power meter 6, the output end 13 of the directional coupler 7 is connected with the signal center 2 of the test system, the coupling power ratio of the directional coupler 7 is set as the bias of the standard pulse power meter 6, and the sampling signal of the directional coupler 7 is measured by the standard pulse power meter 6.

A multi-channel transmission standard device is shown in FIG. 2, a control board 21 controls the states of a load switch, an electric control phase shifter and an electric control attenuator, a transmitting signal is divided into two parts by a power divider 16 through a signal input end 30, one end 22 of the power divider is in short circuit with a switch end 23 through a rigid cable, the load switch 17 divides into eight parts and outputs the eight parts through a TouT/Rin port 24, two ends 29 of the power divider are in short circuit with a reference input end 28 through the rigid cable, sequentially pass through an electric control 1dB step attenuator 18, an electric control phase shifter 19 and an electric control 10dB step attenuator 20 and output through a reference output end 25, a receiving signal is input through the TouT/Rin port 24 and input into the switch end 23 and the reference signal through the load switch 17 and the reference output end 25, sequentially pass through the electric control 10dB step attenuator 20, the electric control phase shifter 19 and the electric control 1dB step attenuator 18 and input into the reference input end 28.

The calibration system receives analog quantity, as shown in fig. 3, the signal generator 4 of the test system 1 inputs an excitation signal to the signal source end 36 of the signal hub 2, the TouT/Rin Port 24 of the multichannel transmission standard device 15 is connected to the test Port 34 of the signal hub 2, the reference output end 25 is connected to the reference end 35 of the signal hub 2, the Port1 of the network analyzer 31 is connected to the reference input end 28, the Port2 of the network analyzer 31 is connected to the switch end 23, the electrically controlled

attenuators

18 and 20 and the electrically controlled phase shifter 19 are adjusted according to the working frequency range of the test system, the difference value B/a between the amplitudes of the two paths of the signals of the reference channel and the receiving channel is measured, and the analog amplitude and the phase of the system to be tested are automatically calibrated by the two ports.

The calibration system emits analog quantity, as shown in fig. 4, the signal generator 4 of the test system 1 inputs an excitation signal to the signal input end 30, the TouT/Rin Port 24 of the multi-channel transmission standard device 15 is connected with the test Port 34 of the signal center 2, the reference output end 25 is connected with the reference end 35 of the signal center 2, the Port1 of the network analyzer 31 is connected with the Port1 end 39 of the signal center 2, the Port2 of the network analyzer 31 is connected with the Port2 end 38 of the signal center 2, the electrically controlled

attenuators

18, 20 and the electrically controlled phase shifter 19 are adjusted according to the working frequency range of the test system, the two-way signal amplitude-phase difference value B/a of the reference channel and the two-way signal amplitude-phase difference value B/a of the receiving channel are measured, and the analog amplitude and phase of the tested system are automatically calibrated by the whole two ports.

Calibrating system digital quantity, as shown in fig. 5, a signal generator 4 inputs an excitation signal to a signal center 2, a reference end 35 is connected with a reference digital T/R component 40 through a standard analog part 41, a test port 34 is connected with a tested digital T/R component 8, the reference digital T/R component 40 outputs a signal through a reference digital T/R component optical port 43, the amplitude and the phase of any one of 1-8 paths are selected as a reference, and the tested digital T/R component 8 outputs a signal through a tested digital T/R component optical port 42 and collects the signal as a test.

As shown in FIG. 6, the main control computer 48 controls the interface module 50, the code element simulation module 51 and the digital noise simulation module 52 in the code element generator 46 to process commands through the VPX bus by the control module 47, the code element simulation module 51 generates a digital T/R component standard code element signal, the digital noise simulation module 52 generates a digital noise signal, the code element signal and the noise signal are input into the interface module 50 for packaging, and are input into the test system 1 for calibration through the optical fiber 53, and the recording module 49 analyzes the signal output by the interface module 50 for data test and calibration.

The above-described embodiments are not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the present invention.

Claims

1. A calibration technique for a radio frequency digital T/R component test system, comprising: calibrating pulse power by using a directional coupler and adopting a coupling ratio method; calibrating the system analog quantity by using a multi-channel transmission standard device; calibrating the system digital quantity by using a standard analog piece and adopting an interpolation method; the digital performance of the system is verified using a digital symbol generator.

2. The calibration technique for a radio frequency digital T/R component test system as claimed in claim 1, wherein the calibrating the pulsed power comprises: the output end of the tested digital T/R component is connected with the input end of the directional coupler, the coupling end of the directional coupler is connected with the standard pulse power meter, the output end of the directional coupler is connected with the signal center of the test system, the coupling power ratio of the directional coupler is set to be the bias of the standard pulse power meter, and the standard pulse power meter measures the sampling signal of the directional coupler.

3. The calibration technique for a radio frequency digital T/R component test system according to claim 1, wherein the multi-channel pass-through standard device comprises: the control panel controls the states of the load switch, the electric control phase shifter and the electric control attenuator, a transmitting signal passes through a signal input end and is divided into two parts by the power divider, one end of the power divider is in short circuit with a switch end through a rigid cable, the other end of the power divider is divided into eight parts by the load switch and is output through a TouT/Rin port, two ends of the power divider are in short circuit with a reference input end through a rigid cable, the two ends of the power divider sequentially pass through the electric control 1dB step attenuator, the electric control phase shifter and the electric control 10dB step attenuator and are output through a reference output end, a receiving signal is input through the TouT/Rin port and is input into the switch end through the load switch, the reference signal is input into the reference output end, and the reference signal is input into the reference input end sequentially through the electric control 10dB step attenuator, the electric control phase shifter and the electric control 1dB step attenuator.

4. The calibration technique for a radio frequency digital T/R component test system as claimed in claim 3, wherein the calibration system analog quantity comprises: the calibration system receives analog quantity: a signal generator of the test system inputs an excitation signal to a signal source end of a signal center, a TouT/Rin Port of a multi-channel transmission standard device is connected with a test Port of the signal center, a reference output end is connected with a reference end of the signal center, a Port1 of a network analyzer is connected with a reference input end, a Port2 of the network analyzer is connected with a switch end, an electric control attenuator and an electric control phase shifter are adjusted according to a working frequency range of the test system, a difference B/A of two signal amplitudes of a reference channel and a receiving channel is measured, and the analog amplitude and the phase of the tested system are automatically calibrated by the two ports; the calibration system transmits analog quantity: a signal generator of the test system inputs an excitation signal to a signal input end, a TouT/Rin Port of a multichannel transmission standard device is connected with a test Port of a signal center, a reference output end is connected with a reference end of the signal center, a Port1 of a network analyzer is connected with a Port1 end of the signal center, a Port2 of the network analyzer is connected with a Port2 end of the signal center, an electric control attenuator and an electric control phase shifter are adjusted according to a working frequency range of the test system, a difference value B/A of amplitudes and phases of two paths of signals of a reference channel and a receiving channel is measured, and the analog amplitude and the phase of the tested system are automatically calibrated through a whole two ports.

5. The calibration technique for a radio frequency digital T/R component test system as claimed in claim 3, wherein said calibration system digital values comprise: the signal generator inputs an excitation signal to the signal center, the reference end is connected with the reference digital T/R component through the standard analog component, the test port is connected with the tested digital T/R component, the reference digital T/R component outputs a signal through the optical port of the reference digital T/R component, the amplitude and the phase of any one of 1-8 paths are selected as a reference, and the tested digital T/R component outputs a signal through the optical port of the tested digital T/R component and collects the signal as a test.

6. The calibration technique for a radio frequency digital T/R component test system as claimed in claim 1, wherein said verifying system digital performance comprises: the main control computer processes commands through a control module, a control interface module, a code element simulation module and a digital noise simulation module through a VPX bus, the code element simulation module generates a digital T/R component standard code element signal, the digital noise simulation module generates a digital noise signal, the code element signal and the noise signal are input into the interface module for packaging, the code element signal and the noise signal are input into a test system for calibration through an optical fiber, and a recording module analyzes signals output by the interface module and is used for data test and calibration.