CN117478249A - Automatic channel calibration method suitable for distributed semi-physical simulation test system - Google Patents
Automatic channel calibration method suitable for distributed semi-physical simulation test system Download PDFInfo
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- CN117478249A CN117478249A CN202311042294.XA CN202311042294A CN117478249A CN 117478249 A CN117478249 A CN 117478249A CN 202311042294 A CN202311042294 A CN 202311042294A CN 117478249 A CN117478249 A CN 117478249A
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- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 238000004088 simulation Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000008054 signal transmission Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 14
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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
- H04B17/14—Monitoring; Testing of transmitters for calibration of the whole transmission and reception path, e.g. self-test loop-back
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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
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Abstract
The method is suitable for the automatic calibration of the distributed semi-physical simulation test system channel, and divides the access port into a far-end access sub-network and a near-end access sub-network according to the signal transmission distance condition of the access port of the distributed semi-physical simulation test system; connecting the calibration switch array in series to a distributed semi-physical simulation test system, and connecting the vector network analyzer with the calibration switch array through a selection switch; performing a first set of via calibrations; performing a second set of via calibrations; the vector network analyzer performs calibration on the amplitude, phase and time delay parameters of each path to obtain a loop standard value of each path; taking the 1 st path of receiving path as a reference to obtain a relative calibration value of each path, and analogically obtaining relative amplitude, phase and time delay among different channels to realize the calibration of a plurality of channels; the relative amplitude, phase and time delay among different channels can be obtained, automatic calibration of a plurality of channels is realized, the accuracy and the reliability of data are improved, and the working efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electronic communication, in particular to an automatic channel calibration method suitable for a distributed semi-physical simulation test system.
Background
Compared with a full physical test, the distributed semi-physical simulation test system constructs signal interaction and countermeasure environment among physical equipment through a network, has the advantages of low construction cost, large access scale, flexible environment construction, convenient test organization, good result repeatability and the like, and is an important means for developing simulation tests of electronic countermeasure equipment. The injection simulation test of the direction-finding performance of the electronic countermeasure equipment is developed, and the channel amplitude, phase and time delay consistency of the distributed semi-physical simulation test system are required to be calibrated in the test preparation stage.
The system stability is a key factor for ensuring that the system can maintain consistency and reliability in long-time operation, the self-checking calibration can help ensure that data generated by the semi-physical simulation test system are accurate, and the self-checking calibration can help find errors and deviations in the system and compensate and correct the errors and deviations. The stability of the semi-physical simulation test system can be verified through self-checking calibration; through self-checking calibration, whether each part of the system works normally or not can be checked, and whether the system can operate within the expected precision and performance range or not can be determined; by comparing with the calibration accurate value, the measurement error of the system can be determined, and the calibration coefficient can be calculated. During calibration, the data output by the system can be checked for compliance with the expected data by comparison with known accurate values. These calibration coefficients can be applied in subsequent measurements and experiments to improve the accuracy and reliability of the data.
At present, the working frequency range of the existing distributed semi-physical simulation test system is from short waves to microwaves, the number of radio frequency access ports is up to hundreds, the positions of the radio frequency access ports are scattered relatively and the distances between the radio frequency access ports are relatively far, and in order to realize time delay, attenuation and relative calibration of a selected link, the existing simulation system utilizes instruments such as a vector network analyzer, an oscilloscope, a signal source, a spectrometer and the like to calibrate the link item by item, so that the time and the effort are consumed, and the working efficiency is low.
For the above reasons, an automatic calibration method suitable for the distributed semi-physical simulation test system channel is developed.
Disclosure of Invention
The invention aims to solve the problems and provide an automatic calibration method suitable for a distributed semi-physical simulation test system channel, which can obtain relative amplitude, phase and time delay among different channels, thereby realizing automatic calibration of the consistency of the amplitude, the phase and the time delay of a plurality of channels of the semi-physical simulation test system, improving the accuracy and the reliability of data, realizing automatic calibration of the time delay, the phase and the attenuation of the system in a limited time, improving the working efficiency and providing guarantee for developing the performance test of a comparison system of comparison amplitude and comparison equal direction finding system of electronic countermeasure equipment.
In order to achieve the above purpose, the invention provides an automatic channel calibration method suitable for a distributed semi-physical simulation test system, which comprises the following steps of S1: dividing an access port into a far-end access sub-network and a near-end access sub-network according to the signal transmission distance condition of the access port of the distributed semi-physical simulation test system;
s2: connecting the calibration switch array in series to a distributed semi-physical simulation test system, and connecting the vector network analyzer with the calibration switch array through a selection switch; the calibration signal of the vector network analyzer selects the input and output ports of the two calibration switch arrays through the two 2-to-1 switches, so that the calibration signal of the vector network analyzer enters the calibration switch array of a certain subnet;
s3: the first set of path calibration is performed as follows:
s3.1, a calibration output signal of the vector network analyzer is selected through a calibration switch array, firstly, enters a system from a 1 st path of transmission channel in a group, and is transmitted to a bidirectional unit through a radio frequency cable;
s3.2, the bidirectional unit switches the calibration signals to 2-4 paths of input ports respectively, and then transmits the calibration signals to the radio frequency conversion equipment through corresponding receiving path radio frequency cables;
s3.3, transmitting the calibration signal to the digital signal processing subsystem, transmitting the calibration signal to a port of a 1 st path transmitting path, and outputting the calibration signal to the calibration switch array;
s3.4, the calibration signal is transmitted back to the vector network analyzer to form a calibration loop, and the calibration value of a loop formed by the 1 st path of transmission path and the 2-4 receiving paths is obtained under the condition that the transmission path is unchanged;
s4: the second set of path calibrations is performed as follows:
s4.1, a 2 nd path of transmitting path calibration signal enters the system and is transmitted to the bidirectional unit through the radio frequency cable;
s4.2, the bidirectional unit switches the calibration signals to input ports of 1 path and 3 paths respectively, and then transmits the calibration signals to the radio frequency conversion equipment through corresponding receiving path radio frequency cables;
s4.3, the calibration signal enters a digital signal processing subsystem and is transmitted to a port of a 2 nd path of transmitting path and is output to a calibration switch array;
s4.4, the calibration signal is transmitted back to the vector network analyzer to form a calibration loop, and the calibration value of a loop formed by the 2 nd transmission path and the 1 st and 3 rd receiving paths is obtained under the condition that the transmission path is unchanged;
s5: the vector network analyzer performs calibration on the amplitude, phase and time delay parameters of each path to obtain a loop standard value of each path;
s6: taking the 1 st receiving path as a reference to obtain a relative calibration value of each path, and obtaining a difference value between 1-4 receiving paths through twice calibration; and the relative amplitude, phase and time delay among different channels are obtained by analogy, so that the calibration of a plurality of channels of the distributed semi-physical simulation test system is realized.
The beneficial effects are that: the invention can obtain the relative amplitude, phase and time delay among different channels, thereby realizing the automatic calibration of the consistency of the amplitude, phase and time delay of a plurality of channels of the semi-physical simulation test system, improving the accuracy and reliability of data, realizing the automatic calibration of the time delay, phase and attenuation of the system in a limited time, improving the working efficiency and providing guarantee for developing the performance test of the comparison system of the comparison amplitude and comparison equal direction measurement system of electronic countermeasure equipment; the present invention is not described in detail in the prior art.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a distributed semi-physical simulation test system;
FIG. 2 is a schematic diagram of a calibration scheme;
FIG. 3 is a calibration schematic;
in the figure: a bidirectional unit 1.1, a frequency conversion unit 1.2, a test control unit 1.3 and a digital signal processing unit 1.4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
As shown in FIG. 1, the distributed semi-physical simulation test system mainly comprises a bidirectional unit 1.1, a frequency conversion unit 1.2, a test control unit 1.3 and a digital signal processing unit 1.4;
the automatic channel calibration method suitable for the distributed semi-physical simulation test system comprises the following steps of:
s1: dividing an access port into a far-end access sub-network and a near-end access sub-network according to the signal transmission distance condition of the access port of the distributed semi-physical simulation test system;
s2: selecting a remote access sub-network, connecting a calibration switch array in series to a distributed semi-physical simulation test system, connecting a vector network analyzer with the calibration switch array through a selection switch, and selecting input and output ports of the two calibration switch arrays through two 2-1 switches by a calibration signal of the vector network analyzer, so that the calibration signal of the vector network analyzer enters the calibration switch array of the remote access sub-network, as shown in fig. 2;
s3: the first set of via calibrations is performed, as shown in fig. 3, as follows:
s3.1, a calibration output signal of the vector network analyzer is selected through a calibration switch array, firstly, enters a system from a 1 st path of transmission channel in a group, and is transmitted to a bidirectional unit through a radio frequency cable;
s3.2, the bidirectional unit switches the calibration signals to 2-4 paths of input ports respectively, and then transmits the calibration signals to the radio frequency conversion equipment through corresponding receiving path radio frequency cables;
s3.3, transmitting the calibration signal to the digital signal processing subsystem, transmitting the calibration signal to a port of a 1 st path transmitting path, and outputting the calibration signal to the calibration switch array;
s3.4, the calibration signal is transmitted back to the vector network analyzer to form a calibration loop, so that the calibration value of a loop formed by the 1 st transmission path and the 2-4 receiving paths can be obtained under the condition that the transmission paths are unchanged;
s4: the second set of path calibrations is performed, as shown in FIG. 3, as follows:
s4.1, a 2 nd path of transmitting path calibration signal enters the system and is transmitted to the bidirectional unit through the radio frequency cable;
s4.2, the bidirectional unit switches the calibration signals to input ports of 1 path and 3 paths respectively, and then transmits the calibration signals to the radio frequency conversion equipment through corresponding receiving path radio frequency cables;
s4.3, the calibration signal enters a digital signal processing subsystem and is transmitted to a port of a 2 nd path of transmitting path and is output to a calibration switch array;
s4.4, the calibration signal is transmitted back to the vector network analyzer to form a calibration loop, so that the calibration value of a loop formed by the 2 nd transmission path and the 1 st and 3 rd receiving paths can be obtained under the condition that the transmission path is unchanged;
s5: the vector network analyzer performs calibration on parameters such as amplitude, phase and time delay of each path to obtain a loop standard value of each path;
| sequence number | Amplitude calibration value | Phase calibration value | Time delay calibration value |
| 1 | A T1 +A R2 | P T1 +P R2 | T T1 +T R2 |
| 2 | A T1 +A R3 | P T1 +P R3 | T T1 +T R3 |
| 3 | A T1 +A R4 | P T1 +P R4 | T T1 +T R4 |
| 4 | A T2 +A R1 | P T2 +P R1 | T T2 +T R1 |
| 5 | A T2 +A R3 | P T2 +P R3 | T T2 +T R3 |
Wherein A is Rn 、P Rn And T Rn Representing the amplitude, phase and delay calibration values of each receive path, A Tn 、P Tn And T Tn Representing the amplitude, phase and delay calibration values of each transmit path;
s6: taking the 1 st receiving path as a reference to obtain a relative calibration value of each path, and obtaining a difference value between 1-4 receiving paths through twice calibration;
| sequence number | Amplitude versus calibration value | Relative calibration value of phase | Time delay relative calibration value |
| 1 | 0 | 0 | 0 |
| 2 | A R2 -A R1 =（A R3 -A R1 ）-（A R3 -A R2 ） | P R2 -P R1 =（P R3 -P R1 ）-（P R3 -P R2 ） | T R2 -T R1 =（T R3 -T R1 ）-（T R3 -T R2 ） |
| 3 | A R3 -A R1 | P R3 -P R1 | T R3 -T R1 |
| 4 | A R4 -A R1 =（A R3 -A R1 ）-（A R3 -A R4 ） | P R4 -P R1 =（P R3 -P R1 ）-（P R3 -P R4 ） | T R4 -T R1 =（T R3 -T R1 ）-（T R3 -T R4 ） |
And carrying out multiple measurements to sequentially obtain the relative amplitude, the phase and the time delay among different channels, and realizing the calibration of a plurality of channels of the distributed semi-physical simulation test system.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. The automatic channel calibration method suitable for the distributed semi-physical simulation test system is characterized by comprising the following steps of:
s1: dividing an access port into a far-end access sub-network and a near-end access sub-network according to the signal transmission distance condition of the access port of the distributed semi-physical simulation test system;
s2: connecting the calibration switch array in series to a distributed semi-physical simulation test system, and connecting the vector network analyzer with the calibration switch array through a selection switch; the calibration signal of the vector network analyzer selects the input and output ports of the two calibration switch arrays through the two 2-to-1 switches, so that the calibration signal of the vector network analyzer enters the calibration switch array of a certain subnet;
s3: the first set of path calibration is performed as follows:
s3.1, a calibration output signal of the vector network analyzer is selected through a calibration switch array, firstly, enters a system from a 1 st path of transmission channel in a group, and is transmitted to a bidirectional unit through a radio frequency cable;
s3.2, the bidirectional unit switches the calibration signals to 2-4 paths of input ports respectively, and then transmits the calibration signals to the radio frequency conversion equipment through corresponding receiving path radio frequency cables;
s3.3, transmitting the calibration signal to the digital signal processing subsystem, transmitting the calibration signal to a port of a 1 st path transmitting path, and outputting the calibration signal to the calibration switch array;
s3.4, the calibration signal is transmitted back to the vector network analyzer to form a calibration loop, and the calibration value of a loop formed by the 1 st path of transmission path and the 2 nd to 4 th receiving paths is obtained under the condition that the transmission path is unchanged;
s4: the second set of path calibrations is performed as follows:
s4.1, a 2 nd path of transmitting path calibration signal enters the system and is transmitted to the bidirectional unit through the radio frequency cable;
s4.2, the bidirectional unit switches the calibration signals to the input ports of the 1 st path and the 3 rd path respectively, and then the calibration signals are transmitted to the radio frequency conversion equipment through the corresponding receiving path radio frequency cables;
s4.3, the calibration signal enters a digital signal processing subsystem and is transmitted to a port of a 2 nd path of transmitting path and is output to a calibration switch array;
s4.4, the calibration signal is transmitted back to the vector network analyzer to form a calibration loop, and the calibration value of a loop formed by the 2 nd transmission path and the 1 st and 3 rd receiving paths is obtained under the condition that the transmission path is unchanged;
s5: the vector network analyzer performs calibration on the amplitude, phase and time delay parameters of each path to obtain a loop standard value of each path;
s6: taking the 1 st receiving path as a reference to obtain a relative calibration value of each path, and obtaining a difference value between 1-4 receiving paths through twice calibration; and the relative amplitude, phase and time delay among different channels are obtained by analogy, so that the calibration of a plurality of channels of the distributed semi-physical simulation test system is realized.
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