CN116260533A - Intelligent anti-interference ultrashort wave radio station test platform and application method - Google Patents
Intelligent anti-interference ultrashort wave radio station test platform and application method Download PDFInfo
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- H04B—TRANSMISSION
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- H—ELECTRICITY
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- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses an intelligent anti-interference ultrashort wave radio station test platform and an application method, which relate to the field of equipment overhaul and test and comprise the following steps: installing test software to provide an industrial personal computer, an ultrashort wave radio station two-wire detector, a comprehensive tester, a radio frequency switch matrix and a broadband program-controlled power meter of a test platform; the ultra-short wave radio station two-wire detector is also connected with a programmable direct current power supply. The invention provides an intelligent anti-interference ultrashort wave radio station testing platform and an application method thereof, which can conveniently carry out related works such as performance parameter debugging and fault removal of a six-type anti-interference ultrashort wave radio station under an internal field condition, and effectively improve the repair and autonomous guarantee capability of the anti-interference ultrashort wave radio station.
Description
Technical Field
The invention relates to the field of equipment overhaul and test. More particularly, the invention relates to an intelligent anti-interference ultrashort wave radio station test platform and an application method.
Background
At present, in order to ensure communication, military aircrafts/helicopters are equipped with anti-interference airborne communication radio stations, but the types of anti-interference airborne ultrashort wave radio stations assembled by aircrafts/helicopters of different types and different armies of the same type are different. In order to meet the requirement of a repair product delivery acceptance test, as an aircraft/helicopter maintenance unit, performance indexes and parameters of an anti-interference airborne ultrashort wave radio station are required to be debugged in the aircraft/helicopter assembly, and a fault part is repaired.
In practical application, if corresponding test equipment is independently configured according to the model to perform inspection, the problems of high investment cost, low equipment utilization rate, difficult maintenance and the like are unavoidable, and researches on the anti-interference airborne ultrashort wave radio stations are mainly focused on the aspects of fault detection, bus control technology, audio conversion acquisition and the like of a single set of airborne ultrashort wave radio stations, but the researches on comprehensive automatic test of the multi-model anti-interference airborne ultrashort wave radio stations assembled by an airplane/helicopter are still blank.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and/or disadvantages and to provide at least the advantages described below.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a smart anti-interference ultrashort wave radio station test platform is provided, comprising:
installing test software to provide an industrial personal computer of a test platform;
the ultra-short radio station two-wire detector is in communication connection with a radio station to be detected;
the comprehensive tester is in communication connection with the two-wire detector of the ultra-short wave radio station to realize receiving and transmitting audio;
the radio frequency switch matrix is in communication connection with the radio station to be tested through the switching test box;
a broadband program-controlled power meter in communication connection with the radio frequency switch matrix;
The ultra-short wave radio station two-wire detector is also connected with a programmable direct current power supply, and is connected with a radio frequency switch matrix;
the radio frequency switch matrix is also configured to be connected with a comprehensive tester;
the industrial personal computer is respectively connected with the broadband program-controlled power meter, the program-controlled direct-current power supply, the radio station to be tested, the radio frequency switch matrix and the comprehensive tester through an IEEE488 bus.
Preferably, the ultrashort wave radio station two-wire detector is provided with an excitation source;
the switching test box realizes that a tested radio station is connected with the radio frequency switch matrix through a fixed attenuator;
the transfer test box is connected with the radio frequency switch matrix through the mixer.
Preferably, the industrial personal computer is provided with a GPIB card, a PCI-1553 card, a digital I/O card and a multi-serial port expansion card;
the industrial personal computer provides a plurality of voltage outputs of +/-5V, +/-12V and +3.3V through a programmable direct current power supply;
wherein, the multi-serial port expansion card includes:
RS232 bus interface for parameter injection for the radio station to be tested and excitation source;
an RS485 bus interface for realizing parameter setting and changing is communicated with a tested radio station and an excitation source;
and the RS422 bus interface is connected with the tested radio station and the excitation source data transmission interface and used for data transmission test.
Preferably, the ultrashort wave radio station two-wire detector is connected with a program-controlled direct current power supply through a power socket, and the power on and power off of the ultrashort wave radio station two-wire detector and a detected radio station are switched through a switch S1 on a front panel;
a control board card is arranged in the ultrashort wave radio station two-wire detector, and is connected with a 66-core connecting card and a 55-core connecting card of an external radio station to be detected through a matched pin I;
the control board is connected with a 37-core connecting card of an external industrial personal computer through a matched pin II and a switch circuit;
wherein the switch circuit is configured to include a switch group disposed on the front panel and a control circuit mated therewith, the switch group including:
a switch S2 for selecting a test mode;
a switch S3 for switching the receiving or transmitting state of the radio station to be tested;
a switch S4 for switching the reception or transmission state of the exciter;
a switch S5 for controlling the forbidden sending of the radio station to be tested;
a switch S6 for switching the control mode of the radio station to be tested;
a band switch S10 for adjusting the radio frequency band;
and a band switch S11 for adjusting the radio frequency band.
Preferably, the band switch S10 includes the following function switching modes:
the audio receiving switching channel I is a load channel of 150 ohms of the audio receiving frequency of the open call, the audio receiving frequency switching channel II is a load channel of 600 ohms of the audio receiving frequency of the open call, the audio receiving frequency switching channel III is a transmitting audio receiving channel, the audio receiving frequency switching channel IV is a broadband audio receiving channel, the audio receiving frequency switching channel V is a lifesaving dense voice frequency channel, the audio receiving frequency switching channel VI is a directional audio channel, and the audio receiving frequency switching channel VII is a data link audio receiving channel;
the band switch S11 includes the following function switching modes:
the audio frequency switching channel I is an audio frequency 150 ohm load channel, the audio frequency switching channel II is an audio frequency 600 ohm load channel, the audio frequency switching channel III is a forwarding audio frequency channel, the audio frequency switching channel IV is a broadband audio frequency channel, the audio frequency switching channel V is an exciter 150 ohm load audio frequency channel, and the audio frequency switching channel VI is a data link audio frequency channel.
An application method of an intelligent anti-interference ultrashort wave radio station test platform, wherein the test platform provides two modes of automatic software test and manual test;
the test flow in the automatic test mode is configured to include:
The method comprises the steps that firstly, a switch S1 and a switch S2 of a two-wire detector of an ultrashort wave radio station are respectively placed in a connection state and an automatic test state, the other functional switches are all pulled down, and a band switch S10 and a band switch S11 are respectively switched to a radio frequency switching channel VII and a sounding frequency switching channel VI;
selecting a corresponding detection subsystem according to the type to be tested in the test software, selecting an automatic test program to enter intelligent test, and storing a test result under a specified root directory by using a suffix name of xlsx;
in the second step, the detection subsystem selects products of different types based on the user management module; scanning and detecting connectivity of each interface of the equipment based on a system self-checking module; configuring each parameter of the equipment based on the parameter configuration module, and performing universal instrument control according to the model selected by the user, and injecting corresponding parameters for the exciter and the radio station to be tested; based on the test analysis module and the performance evaluation module, carrying out data analysis and evaluation on the parameters of the real-time acquisition equipment; based on the data query module, the database data is queried, the re-playback function of corresponding information and data is completed, and a test report is derived according to the test data;
In the second step, for the functional simulation of the automatic sensitivity test of the receiver of the ultrashort wave radio station, a fitting function model matched with the sensitivity signal is constructed by adopting a least square method so as to reduce the test range.
Preferably, the construction process of the fitting function model is configured to include:
STEP1, taking the lowest value m of the measuring range as an initial value, inputting a (m+j) mu V function signal, and collecting sensitivity data S/N (signal to noise ratio) of an ultrashort wave radio receiver, wherein S is a useful signal, N is a noise signal, and j is an adjustment stepping value;
STEP2, based on the collected sensitivity data and the working principle of the receiver of the ultrashort wave radio station, selecting the following function fitting AM-S/N curve:
wherein k epsilon { R|k not equal to 0}, q epsilon { R|k not equal to 0}, R is an overall real set, k, a and q are respectively the proportionality coefficient, the arctangent function coefficient and the exponential coefficient of an arctangent fitting function, AM represents the amplitude input of a radio frequency signal and is the independent variable of the fitting function, A is used for replacing AM in the function derivation process, and q is the exponential coefficient of the independent variable;
STEP3, according to the approximation function characteristic in curve fitting, adopting a least square method solving function of the following formula to fit the optimal values of parameters k, a and q of an AM-S/N curve, so that the residual square sum ls is minimum:
wherein ,
，/>
representing an ith signal-to-noise ratio in the signal-to-noise ratio dataset;
STEP4, when Lss is at a minimum,
，/>
，/>
should be 0, solve the following formula：
wherein ,
representing the sum of squares of the residuals formula biasing k, < >>
Representing the sum of squares formula of the residual error to bias a, < >>
Representing the residual square sum formula to determine the bias derivative of q;
s5, verifying the AM-S/N fitting function based on the solving result of the S4, and further determining that the fitting function is:
preferably, the application method of the fitting function model includes:
randomly selecting an input signal amplitude between measurement ranges, recording amplitude AM0, and recording the sensitivity of an ultrashort wave radio receiver at the point, wherein the sensitivity is S/N0;
according to a fitting function model of receiver sensitivity, calculating an input amplitude deviation value AM1 of an ultrashort wave radio receiver to obtain a value S/N2=S/N1+S/N0 closer to the sensitivity of the target ultrashort wave radio receiver;
and (3) adjusting the amplitude in a stepping way near the value S/N2=S/N1+S/N0 of the receiver sensitivity of the ultrashort wave radio station, so as to obtain a target value AM2 when the receiver sensitivity accords with the technical index of 10 dB.
Preferably, the test procedure in the manual test mode is configured to include:
The method comprises the steps that firstly, a switch S1 and a switch S2 of a two-wire detector of an ultrashort wave radio station are respectively placed in a connection state and an automatic test state, other functional switches are all pulled down, and a band switch S10 and a band switch S11 are respectively switched to a radio frequency switching channel II and a sounding frequency switching channel I;
step two, running test software on a test platform, selecting a corresponding detection subsystem according to the type to be tested in the test software, and selecting a manual test program to select a system to enter a performance test item;
wherein the performance test items include: carrier power test, frequency error test, modulation characteristic test, single tone modulation test, side tone output level test, carrier noise test, spurious amplitude modulation test, spurious frequency modulation test, conventional sensitivity test, anti-interference sensitivity test, audio frequency response test, audio distortion test, squelch test, AGC test, data transmission power test, data transmission sensitivity test.
The invention at least comprises the following beneficial effects: the test platform can conveniently carry out related works such as performance parameter debugging and fault removal of the six-type anti-interference ultrashort wave radio station under the condition of an internal field, and effectively improves the repair and autonomous guarantee capability of the anti-interference ultrashort wave radio station.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic block diagram of a test system of the present invention;
FIG. 2 is an enlarged schematic view of the left half of FIG. 1;
FIG. 3 is an enlarged schematic view of the right half of FIG. 1;
FIG. 4 is a schematic diagram of a data architecture of the test software of the present invention;
FIG. 5 is a schematic diagram of a data storage format of the system software of the present invention;
FIG. 6 is a schematic diagram of a development architecture of the system software of the present invention;
FIG. 7 is a block diagram of the system components of the system software of the present invention;
FIG. 8 is a schematic diagram of the operational flow of the system software of the present invention;
FIG. 9 is a graph of a fitting of the AM-S/N fitting function of the present invention;
FIG. 10 is a schematic flow chart of the construction of the functional model of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "engaged/connected," "connected," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, may be a detachable connection, or may be an integral connection, may be a mechanical connection, may be an electrical connection, may be a direct connection, may be an indirect connection via an intermediary, may be a communication between two elements, and for one of ordinary skill in the art, the specific meaning of the terms in this disclosure may be understood in a specific case.
The intelligent anti-interference ultrashort wave radio station testing platform is a hardware platform built according to conventional function tests and anti-interference function tests (such as frequency hopping, frequency spreading and the like) of an onboard anti-interference ultrashort wave radio station, various general instruments of a radio communication testing system and anti-interference function signal excitation sources are selected, meanwhile, special two-wire detectors are developed by combining different types of anti-interference ultrashort wave radio stations, a general 1553 bus communication card, a GPIB card and an RS485/RS422/RS232 serial port card are provided as control system cores of the whole platform through an industrial computer platform, and the detection requirements of the anti-interference ultrashort wave radio station are realized through software configuration, special software and output control.
In terms of overall architecture design, the test platform of the invention adopts a distributed design, a schematic block diagram is shown in fig. 1-3, and the test platform is specifically divided into components such as an industrial personal computer (the control platform is also called a test platform, the industrial personal computer is called an industrial control computer), an XX-1B type ultrashort wave radio station two-wire detector is called a two-wire detector, a programmable power supply, a radio station comprehensive tester (also called a comprehensive tester), a broadband power meter, a programmable radio frequency switch matrix (also called a radio frequency switch matrix), a cabinet and the like, and the components form the whole hardware resource.
The industrial personal computer: the dual-core 2.6GCPU and 2G memory can be used for connecting various boards and providing various voltage outputs of +/-5V, +/-12V and +3.3V. The software of the ultrashort wave radio station two-wire detector completes initialization of the board card through the platform of the industrial personal computer, functional application, control of the tested product and feedback and display of the test result.
Multiple serial port card: the standard RS232/RS422/RS485 bus interface with 4 paths at most is provided, and the system has good expansibility and compatibility. The RS232 bus interface is used for injecting parameters for the tested airborne radio station and the excitation source. The RS485 bus interface is used for communicating the tested airborne radio station and the excitation source, and parameter setting and changing are realized. The RS422 bus interface is connected with the tested airborne anti-interference ultrashort wave radio station and the excitation source data transmission interface for data transmission test.
A mixer: the excitation source is output to the LO local oscillation end of the mixer, the radio station comprehensive tester is opened in a duplex state to set the frequency to 200MHz, the radio frequency switch matrix is not modulated to the RF end of the mixer, and the IF intermediate frequency port of the mixer is output to the radio frequency switch matrix.
2. Test platform control method
2.1 preparation before testing
(1) Placing the test platform at a proper position; the tested anti-interference ultrashort wave radio stations are placed on other nearby platforms.
(2) Corresponding test cables and other connecting cables are connected through marks on the cable heads.
(3) An "AC220V" power cord was used to connect to an AC220V power supply.
(4) The power switch of the industrial personal computer is turned on, the industrial personal computer, the program-controlled power supply (N5745A), the radio station comprehensive tester (2945B), the radio frequency switch matrix (34970A) and the broadband program-controlled power meter (N1913A) are started, and test software is operated by combining different types of tested products.
2.2 introduction of the function switch of the two-wire detector
Power switch S1: and powering up the two-wire detector and the anti-interference ultrashort wave radio station.
Control mode selection switch S2: a device test mode is selected. When the "automatic" gear is engaged, the front panel switch is deactivated. When the manual gear is set, the manual test function is executed by matching with the toggle switch.
The tested station transmitting/receiving change-over switch S3: and controlling the receiving and transmitting states of the tested product.
Excitation station transmit/receive change-over switch S4: and controlling the receiving and transmitting states of the exciter.
Disabling control switch S5: when the radio station is turned on, the radio station cannot transmit, and when the manual test radio station receives the project, the switch can be effective to prevent the radio station from being damaged due to long-time transmission caused by mistakenly turning on the test radio station PTT.
Bus control switch S6: the switch is used to select whether the bus control station or the control box control station. The bus address can be set by a program or on an address selection switch on the front panel (according to the type of the anti-interference ultrashort wave radio station).
Red light illumination control switch S7: the switch is used to switch whether the red illumination of the control box is powered or not during manual testing.
Lamp detection switch S8: the indicator light can be detected to be good or bad when the device to be detected is not connected.
Address selection switch S9: the address of 1553B is selected.
The band switch S10 is a radio frequency band adjusting switch, which includes:
the receiver 150 (also referred to as the receiver audio switching channel i): switching to an open voice receiving audio 150 ohm load path (expansion);
receive 600 (also referred to as receive audio switching channel ii): switching to a 600 ohm load path of the open voice radio;
Forwarding receive (also referred to as receive audio switching channel iii): switching to a forwarding radio frequency channel;
broadband reception (also referred to as reception audio switching channel iv): switching to a broadband radio channel (extension);
life-saving (also called as audio-saving switching channel v): switching to a lifesaving dense voice frequency path (extension);
directional receive (also referred to as receive audio switching channel vi): switch to a directional audio path (extension);
data link reception (also referred to as reception audio switching channel vii): and switching to a data link radio frequency channel (expansion).
The band switch S11 is a sounding frequency band adjusting switch, and includes:
the transmit 150 (also referred to as transmit audio switching channel i): switching to a load path with the open voice frequency of 150 ohms;
the sender 600 (also referred to as the sender audio switching channel ii): switching to an open-speech audio 600 ohm load path (extension);
forwarding (also called audio switching channel iii): switching to a forwarding sounding channel;
broadband hair (also referred to as a hair-to-audio switching channel iv): switching to a wideband sounding channel (extension);
exciter transmit 150 (also referred to as transmit audio switching channel v): switching to the exciter 150 ohm load audio path;
Data chaining (also referred to as audio switching channel vi): switching to the data link voice frequency path (extension).
2.3 tactical index test method
2.3.1 Intelligent automatic test
The control modes of the two-wire detector S1 power supply and S2 are set at the 'on' and 'automatic', the other function switches are all pulled down, and the two knob band switches are set at the 'data chain receiving and data chain transmitting' positions. And running test platform software, selecting a corresponding detection subsystem according to the type to be tested after successful login, selecting an automatic test program system to enter intelligent test, and storing a test result in an automatic xlsx extension file under a specified root directory.
The detection subsystem selects products of different types based on the user management module; scanning and detecting connectivity of each interface of the equipment based on a system self-checking module; configuring each parameter of the equipment based on the parameter configuration module, and performing universal instrument control according to the model selected by the user, and injecting corresponding parameters for the excitation source and the radio station to be tested; based on the test analysis module and the performance evaluation module, carrying out data analysis and evaluation on the parameters of the real-time acquisition equipment; and based on the data query module, the database data is queried, the re-playback function of corresponding information and data is completed, and a test report is derived according to the test data.
In the second step, for the functional simulation of the automatic sensitivity test of the receiver of the ultrashort wave radio station, a fitting function model matched with the sensitivity signal is constructed by adopting a least square method so as to reduce the test range.
The construction flow of the fitting function model is configured to include:
the anti-interference airborne ultrashort wave radio station is in a receiving state, the working mode is AM (amplitude modulation), and the working frequency is 130MHz; when the frequency of the modulating signal is 1000Hz and the modulating coefficient is 30%, the frequency of the radio frequency signal is 130MHz, the amplitude of the radio frequency signal is 0.1 mu V, and the receiving sensitivity is 0.5dB; when the radio frequency signal amplitude continues to increase, the receiving sensitivity continues to increase faster, and when the radio frequency signal amplitude is 10.0 mu V, the radio frequency signal amplitude continues to increase and slows down; the sensitivity is a step signal of radio frequency signal amplitude input (AM) mu V, the relation between the radio frequency signal amplitude input (AM) mu V and the receiving sensitivity (S/N) dB is recorded, and the data are shown in the following table:
analyzing and fitting the acquired data, and selecting a function fitting AM-S/N curve according to the image data distribution:
Wherein k epsilon { R|k not equal to 0}, q epsilon { R|k not equal to 0}, R is the whole real set, and k, a and q are the proportionality coefficient, the arctangent function coefficient and the exponential coefficient of the arctangent fitting function respectively.
According to the characteristic of the approximation function in curve fitting, the optimal values of parameters k, a and q of a fitting function of a formula I are solved by adopting a least square method, so that the square sum of residuals Lss is minimum, and the formula II is shown below.
wherein ,
let a=am, and the partial derivatives of k, a, q are obtained by equation two:
(equation three)
(equation IV)
(equation five)
At the time when Lss is at a minimum value,
，/>
，/>
the method is 0, the solution of the formula III, the formula IV and the formula V is available, k=31.44, q=0.6176 and a= 0.4453, the AM-S/N fitting function is verified, the fitting effect is good, and the fitting requirement is met, and the method comprises the following stepsThe results are shown in FIG. 9.
In summary, the fitting function is determined as:
as shown in fig. 10, the application method of the function model includes:
randomly selecting an input signal amplitude between measurement ranges, recording the amplitude AM 0 At this point, the receiver sensitivity of the ultrashort wave radio station is denoted as S/N 0 。
According to an AM-S/N signal function model of receiver sensitivity, calculating an input amplitude deviation value AM of an ultrashort wave radio receiver 1 Obtaining the value S/N of the receiver sensitivity of the ultrashort wave radio station closer to the target 2 =S/N 1 +S/N 0 。
Value S/N of receiver sensitivity in ultrashort wave radio 2 =S/N 1 +S/N 0 Small-range amplitude adjustment is carried out nearby, and when the sensitivity of the super-receiver meets the technical index of 10dB, a target value AM is obtained at the moment 2 。
In the scheme, the function model is used for optimizing the selection of the tested measuring points, the mode of gradually increasing the minimum value point of the sensitivity of the receiver of the ultrashort wave radio station is compared, the robustness of software is improved, and the response time and the test period are effectively shortened.
Test platform software
The software development tool selects Lab Windows CVI with interactive C language programming environment, lab Windows CVI is a development platform under the framework of the Vpp standard, provides a VISA function library, can run an instrument soft panel specified by the standard, and can edit and modify an instrument driver program, so that a user can integrate the system at a higher level. LabWindows/CVI is one of the best platforms for developing virtual instrument systems, organically combines a powerful and flexible C language platform with a measurement and control professional tool library for data acquisition, analysis and display, greatly enhances the functions of C/C++ language by integrating the development platform, the interactive programming method, the function panel and the library function, and provides great convenience for scientific personnel familiar with C language to establish a detection system, an automatic measurement system, a data acquisition system, a process monitoring system and the like. LabWindows/CVI is based on ANSI C, on which various extensions of the testing and instrumentation fields are added and changed into an IDE (Integrated development Environment).
Because the data interaction in the test process is more, the test method comprises data such as instructions, data, operation languages and the like. To enhance the modularity and extensibility of the software system, the complete separation of the design program and the data, the data architecture of the test software on the test platform is shown in fig. 4, and the data architecture of the test software on the test platform is configured to include: the data end and the program end are designed separately and interconnected through a data interface;
the data terminal is provided with user class data, instruction class data, test class data and display class data;
the program end is provided with a permission verification module, an instrument control module, a performance test module, a parameter test module and a display module;
when the system module has a data request, the system module calls a database or a data file through a data interface to complete detection or other functions.
The data storage format of the detection subsystem software is shown in fig. 5, the development architecture is shown in fig. 6, the composition block diagram is shown in fig. 7, and the detection subsystem software comprises: user login, system self-checking, user management, parameter configuration module, test analysis, performance evaluation and data query module, and the operation flow of the software system is shown in FIG. 8;
a) User login: the current system login user is an administrator user, and can enter a user management module to perform new adding, modifying and deleting operations on the system user information;
b) And (3) system self-checking: and finishing the self-inspection of the universal instrument. The self-checking process is to access a self-checking interface through a self-checking interface cable, start a self-checking program, respectively scan and detect connectivity of each interface of the equipment, and store the result;
c) User management: the method is used for selecting products of different types;
d) Parameter configuration module: the system is used for controlling all parameters of equipment and carrying out universal instrument control according to different models selected by a user, and simultaneously injecting different exciter and tested radio parameters into different models so as to realize the integrated test requirement of the multi-type anti-interference airborne ultra-short wave radio;
e) And a test analysis module: collecting equipment parameters in real time and analyzing data;
f) Performance evaluation module: for a comprehensive assessment of performance;
and a data query module: and finishing the re-playback function of the corresponding information and data by inquiring the database data, and deriving a test report according to the test data.
2.3.2 Manual test
The power supply of the two-wire detector S1 is turned on and automatic, the other functional switches are turned down, and the two knob band switches are arranged at the positions of 'receiving 600 and transmitting 150'. After the test platform software is run and logging is successful, corresponding test software is selected according to the type to be tested, a manual test program system is selected to enter performance test item selection, test parameters are matched and test items are modified through model selection, and the specific tests are as follows:
1. Carrier power testing
(1) The conventional power test directly connects the antenna port of the tested product to the N port of the radio station comprehensive tester 2945B, the radio station comprehensive tester OFF drops the modulation signal, removes the modulation signal, sets the corresponding modulation mode and frequency by the control box software, sets the switch S3 as the tested station, and can test the carrier power of the anti-interference ultrashort wave radio station from the radio station comprehensive tester.
(2) During the anti-interference power test, the radio frequency switch matrix (34970A) gates "112".
The control box software sets a corresponding modulation mode, the radio station comprehensive tester does not need modulation, finds a 'difference test record' under the catalog of an installation file, opens the file, finds a difference value of a corresponding test item, adds a power meter calibration value, namely the difference value of the whole system, and fills the value into an Offset value under the channel\offsets catalog of the power meter. Then, the switch S3 is set as 'tested station', and the value obtained in the power meter is increased by 30dB, namely the carrier power, so that the technical requirement is met.
2. Frequency error testing
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The control box software sets the corresponding frequency, the modulation mode FM, the radio station comprehensive tester does not need modulation, the switch S3 is set as' tested station, and the frequency error is read from the radio station comprehensive tester, so that the technical requirement is met.
(3) The control box software changes the modulation mode FM state into an AM state, and the step (2) is repeated to check whether the frequency error meets the technology.
3. Modulation characteristic test
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The control box software sets the corresponding frequency, modulation mode AM, panel knob switch is set in "send 150" or "forward" position respectively.
(3) The audio signal source outputs 1kHz and 0.5V when the radio station comprehensive tester tests the clear words, the audio signal source outputs 1kHz and 2V when the test is repeated, and the audio filter is a 300 Hz-3.4 kHz bandpass.
(4) The switch S3 is set as a tested station to check whether the modulation degree of the transmitter meets the requirement of technical indexes.
(5) Changing the AM state of the modulation mode into the FM state, repeating the step (2), and checking whether the modulation degree of the transmitter meets the requirement of the technical index.
4. Single tone modulation test
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The audio filter of the radio station comprehensive tester is a 300 Hz-3.4 kHz bandpass.
(3) The modulation mode of the control box software is AM or FM, and the control box software transmits by pressing a single key.
(4) The single-tone frequency should be between (0.92-1.12) kHz, and the test value of the radio station comprehensive tester should meet the modulation degree of not less than 80% or the frequency modulation frequency offset should be (+/-) (6+/-0.5) kHz.
5. Side tone output level test
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The knob switch is set as 'send 150', 'receive 600', the modulation audio output of the radio station comprehensive tester is 1kHz,0.5V, and the audio filter is a band-pass of 50 Hz-15 kHz.
(3) Setting corresponding frequency, and modulating the modulation mode to be AM or FM.
(4) The switch S3 is set as 'tested station transmitting', the amplitude of the audio level is adjusted to enable the amplitude of the transmitter to be 80% or the frequency modulation frequency deviation is +/-6 kHz, the station comprehensive tester is set as a dual-receiving (DX mode), and the detection side tone output level should meet the technical requirement.
6. Carrier noise testing
(1) The programmable radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The control box software sets the corresponding frequency, the modulation mode is AM or FM, and the knob switch is set as '150'.
(3) The modulation audio output of the radio station comprehensive tester is 1kHz,0.5V, and the audio filter is a 300 Hz-15 kHz bandpass.
(4) The switch S3 is set as 'tested station transmitting', the amplitude of the audio level is adjusted to enable the modulation degree of the transmitter to be AM80% or frequency deviation FM 6kHz, the modulation audio output is closed by the station comprehensive tester by taking the amplitude as a reference value of 0dB, and the modulation characteristic or frequency deviation of the station comprehensive tester is read out and compared with the carrier noise which is the value without removing the modulation audio, so that the technical index requirement is met.
7. Parasitic amplitude modulation test
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The audio knob band switch is set to be "150", the control box software is set to be 135.6MHz, and the modulation mode is set to be FM.
(3) The modulation audio output of the radio station comprehensive tester is 1KHz,0.5V, and the audio filter is 300 Hz-3.4 KHz bandpass.
(4) The switch S3 is set as 'tested station', and the frequency offset of the checking transmitter can reach +/-6 kHz +/-0.5 kHz.
(5) The radio station comprehensive tester is set to be amplitude modulation and demodulation, and the parasitic amplitude modulation of the transmitter is checked to be the parasitic amplitude modulation value.
8. Parasitic frequency modulation test
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The sounding frequency knob band switch is set as '150', the radio frequency knob switch is set as '600', the control box is set as 135.6MHz, and the modulation mode is as follows: AM.
(3) The modulation audio output of the radio station comprehensive tester is 1kHz,0.5V, and the audio filter is a 300 Hz-3.4 kHz bandpass.
(4) The switch S3 is set as 'tested station transmitting/receiving', and the tuning amplitude of the checking transmitter is not less than 80%.
(5) The radio station comprehensive tester is set as frequency modulation demodulation, and the parasitic frequency deviation value of the transmitter is checked to be the parasitic frequency modulation value.
9. Routine sensitivity test
(1) The tested anti-interference ultra-short wave radio station antenna interface is directly communicated to the N-type antenna interface of 2945B.
(2) The panel audio receiving knob switch is 'receiving 600'.
(3) The control box software sets corresponding frequency, and the modulation mode is AM or FM.
(4) Adjusting radio frequency output signals of the radio station comprehensive tester to be 1kHz and AM:30% or FM: 6kHz, radio frequency output of AM: 103dBm, FM: -113dBm, the audio filter is a 300 Hz-3.4 kHz bandpass.
(5) The receiver output audio signal to noise ratio, i.e. the conventional sensitivity, is checked.
10. Tamper resistant sensitivity test
(1) The radio frequency switch matrix (34970 a) gates "114", "122", "211", "223".
(2) The sounding frequency passage knob switch on the panel is turned on to the excitation generator 150, and the radio frequency passage knob switch is turned on to the receiving 600.
(3) The land navigation control box software selects COM4, clicks "128 control box", and controls the actuator. The control box software selects COM3 and COM4 to be opened respectively, wherein COM3 represents a tested product, and COM4 represents an excitation table. The test station then selects the inject "test parameters" in the control box software and the stimulus station selects the inject "offset parameters".
(4) The control box software is used for setting two radio stations to work in a frequency hopping state (FH voice or 120C frequency hopping), and presetting the same parameters, (the frequency hopping frequency table is preset in the radio stations, the frequency difference between the frequency table of an exciter and a tested product is D), the frequency of a radio frequency generator (RF Gen Freq) is D (as the following table), the radio frequency level without modulation is-63 dBm (the system loss is 1dB, the attenuator is 30dB, the mixer loss is 7dB, the actual radio frequency level is-101 dBm), in a duplex (DX mode) interface, the audio frequency of an audio transmitting port is 1KHz and 500mV, S4 on a panel is set as 'excitation station transmitting', and at the moment, the signal to noise ratio (namely the anti-interference sensitivity) in the state can be read out through a duplex port.
The D value and the UV band hopping frequency table are as follows:
table No. 0 d=200 MHz, table No. d=260 MHz, table No. 2 d=200 MHz, table No. 3 d=200 MHz, table No. 4 d=100 MHz, table No. 5 d=0 MHz, table No. 6 d=210 MHz, table No. 7 d=80 MHz, table No. 8 d=190 MHz;
the VHF band hopping frequency table difference is as follows:
table No. 0 d=10 MHz, table No. 1 d=10 MHz, table No. 2 d=10 MHz, table No. 3 d=10 MHz, table No. 4 d=10 MHz, table No. 5 d=10 MHz, table No. 6 d=10 MHz, table No. 7 d=10 MHz, table No. 8 d=20 MHz;
11. audio frequency response test
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) The operation mode of the detector panel is respectively selected to be 'receiving 600'.
(3) The radio station comprehensive tester is adjusted to modulate audio frequency to 1kHz, the modulation degree is 80% of amplitude modulation or frequency modulation signals with frequency deviation of 6KHz, the amplitude is-23 dBm, the audio filter is a band-pass of 50 Hz-15 KHz, and the audio output at the moment is recorded as a reference value of 0dB.
(4) The frequency of the modulation signal is changed from 150 Hz, 300 Hz, 3500 Hz and 7000Hz, and the measured audio output change meets the index requirement.
12. Audio distortion testing
(1) The radio frequency switch matrix (34970 a) gates "111" and "121".
(2) Setting the audio receiving knob switch to receive 600.
(3) The control box software sets corresponding frequency, and the modulation mode is AM or FM.
(4) The radio frequency output signal level of the radio station comprehensive tester is adjusted to be-22 dBm, and the modulation characteristic is AM:50% or FM:6kHz; the audio filter is a band-pass of 50 Hz-15 kHz, and the modulation frequency is corresponding to Natch.
(5) The audio distortion with modulation frequencies of 300Hz,1000Hz and 3500Hz is measured, and the technical requirements are met.
13. Squelch test
(1) The anti-interference ultrashort wave radio station antenna interface is directly communicated to the N-type antenna interface of 2945B.
(2) The test panel audio receiving knob switch is selected to be '600'.
(3) The control box software "squelch on" is set.
(4) The modulation output frequency of radio frequency output signals of the radio station comprehensive tester is adjusted to be 1kHz, the modulation degree is 30% of AM signals or FM signals with frequency deviation of 6kHz (a modulation signal is added to be 150Hz/3KHz when the frequency is fixed in the test 120C), the audio filter is a 300 Hz-3.4 KHz band-pass, the radio frequency level is reduced from 0dBm until the squelch is started, and the minimum radio frequency signal level recorded at the moment is the squelch threshold value.
(5) And reducing the radio frequency signal level to the mute off state, and increasing the signal level until the mute is started, wherein the difference value of the input radio frequency signal level is the mute hysteresis.
14. AGC test
(1) The radio frequency switch matrix (34970 a) gates "113".
(2) The radio station sets corresponding test points and modes.
(3) The test panel audio receiving knob switch is selected to be '600'.
(4) Adjusting radio frequency output signals of the radio station comprehensive tester to be 1kHz and AM:30% or FM:6kHz modulation, -22dBm, the audio filter is a 300 Hz-3.4 kHz bandpass, and the audio output is measured and taken as a reference value of 0dBm. Changing the radio frequency output signal from-72 dBm (AM) or-82 dBm (FM) to 7dBm, and the audio frequency should meet +3 to-3 dB.
15. Data transfer power test
(1) The radio frequency switch matrix (34970 a) gates "112".
(2) When testing UV section data, opening a special U/V analog communication manager, clicking a channel configuration button to set a serial port: serial port selection: COM6, baud rate is set to 115200.
(3) A power meter is provided.
(4) The control box software sets corresponding frequency, the radio station mode is set as MSK, the mode is 01d0, modulation is not added, the U/V analog communication manager is opened to set the packet number to 20, the byte number to 127, the time interval is 0, clicking transmission is carried out, the reading on the power meter is added with fixed attenuation for 30dB, and then the power is converted into watt (W) to be the actual measurement power.
16. Data sensitivity test
(1) The radio frequency switch matrix (34970 a) gates "114", "122", "211", "223".
(2) And respectively opening control box software to control the tested platform and the excitation platform, wherein the tested platform injects the test parameters and the excitation platform injects the offset parameters.
(3) MSK data transfer mode: setting the exciter to work in a '01 d 0' data transmission mode by control box software, wherein the frequency is A; the measured product is set to work in a '01 d 0' data transmission mode, and the frequency is B (|A-B| > =100 MHz). Here |a-b|=c, where A, B is in the radio station working frequency band, the radio station comprehensive tester is driven to duplex state, the frequency of the radio frequency generator (RF Gen Freq) is set to C, the radio frequency level is set to-69 dBm (system loss is 1dB, the attenuator is 30dB, the mixer loss is 7dB, the actual radio frequency level should be-107 dBm), two U/V analog communication managers are opened, the same data function test is set, then COM5 software is sent, COM6 receives, and the number of received packets, the number of correct packets, and the number of error packets are counted, namely, the data transmission sensitivity in the MSK data transmission mode is obtained.
The above is merely illustrative of a preferred embodiment, but is not limited thereto. In practicing the present invention, appropriate substitutions and/or modifications may be made according to the needs of the user.
The number of equipment and the scale of processing described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be readily apparent to those skilled in the art.
Although embodiments of the invention have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. Therefore, the invention is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (9)
1. An intelligent anti-interference ultrashort wave radio station test platform, which is characterized by comprising:
installing test software to provide an industrial personal computer of a test platform;
the ultrashort wave radio station two-wire detector is in communication connection with a radio station to be tested;
the comprehensive tester is in communication connection with the two-wire detector of the ultra-short wave radio station to realize receiving and transmitting audio;
the radio frequency switch matrix is in communication connection with the radio station to be tested through the switching test box;
a broadband program-controlled power meter in communication connection with the radio frequency switch matrix;
the ultra-short wave radio station two-wire detector is also connected with a programmable direct current power supply, and is connected with a radio frequency switch matrix;
The radio frequency switch matrix is also configured to be connected with a comprehensive tester;
the industrial personal computer is respectively connected with the broadband program-controlled power meter, the program-controlled direct-current power supply, the radio station to be tested, the radio frequency switch matrix and the comprehensive tester through an IEEE488 bus.
2. The intelligent anti-interference ultrashort wave radio station test platform according to claim 1, wherein an excitation source is arranged on the ultrashort wave radio station two-wire detector;
the switching test box realizes that a tested radio station is connected with the radio frequency switch matrix through a fixed attenuator;
the transfer test box is connected with the radio frequency switch matrix through the mixer.
3. The intelligent anti-interference ultrashort wave radio station test platform according to claim 2, wherein the industrial personal computer is provided with a GPIB card, a PCI-1553 card, a digital I/O card and a multi-serial port expansion card;
the industrial personal computer provides a plurality of voltage outputs of +/-5V, +/-12V and +3.3V through a programmable direct current power supply;
wherein, the multi-serial port expansion card includes:
RS232 bus interface for parameter injection for the radio station to be tested and excitation source;
an RS485 bus interface for realizing parameter setting and changing is communicated with a tested radio station and an excitation source;
and the RS422 bus interface is connected with the tested radio station and the excitation source data transmission interface and used for data transmission test.
4. The intelligent anti-interference ultrashort wave radio station testing platform according to claim 1, wherein the ultrashort wave radio station two-wire detector is connected with a program-controlled direct current power supply through a power socket, and the power on and power off of the ultrashort wave radio station two-wire detector and a tested radio station are switched through a switch S1 on a front panel;
a control board card is arranged in the ultrashort wave radio station two-wire detector, and is connected with a 66-core connecting card and a 55-core connecting card of an external radio station to be detected through a matched pin I;
the control board is connected with a 37-core connecting card of an external industrial personal computer through a matched pin II and a switch circuit;
wherein the switch circuit is configured to include a switch group disposed on the front panel and a control circuit mated therewith, the switch group including:
a switch S2 for selecting a test mode;
a switch S3 for switching the receiving or transmitting state of the radio station to be tested;
a switch S4 for switching the reception or transmission state of the exciter;
a switch S5 for controlling the forbidden sending of the radio station to be tested;
a switch S6 for switching the control mode of the radio station to be tested;
a band switch S10 for adjusting the radio frequency band;
And a band switch S11 for adjusting the radio frequency band.
5. The intelligent anti-interference ultrashort wave radio station test platform according to claim 4, wherein the band switch S10 comprises the following function switching modes:
the audio receiving switching channel I is a load channel of 150 ohms of the audio receiving frequency of the open call, the audio receiving frequency switching channel II is a load channel of 600 ohms of the audio receiving frequency of the open call, the audio receiving frequency switching channel III is a transmitting audio receiving channel, the audio receiving frequency switching channel IV is a broadband audio receiving channel, the audio receiving frequency switching channel V is a lifesaving dense voice frequency channel, the audio receiving frequency switching channel VI is a directional audio channel, and the audio receiving frequency switching channel VII is a data link audio receiving channel;
the band switch S11 includes the following function switching modes:
the audio frequency switching channel I is an audio frequency 150 ohm load channel, the audio frequency switching channel II is an audio frequency 600 ohm load channel, the audio frequency switching channel III is a forwarding audio frequency channel, the audio frequency switching channel IV is a broadband audio frequency channel, the audio frequency switching channel V is an exciter 150 ohm load audio frequency channel, and the audio frequency switching channel VI is a data link audio frequency channel.
6. An application method of an intelligent anti-interference ultrashort wave radio station test platform according to any one of claims 1 to 5, wherein the test platform provides two modes of software automatic test and manual test;
The test flow in the automatic test mode is configured to include:
the method comprises the steps that firstly, a switch S1 and a switch S2 of a two-wire detector of an ultrashort wave radio station are respectively placed in a connection state and an automatic test state, the other functional switches are all pulled down, and a band switch S10 and a band switch S11 are respectively switched to a radio frequency switching channel VII and a sounding frequency switching channel VI;
selecting a corresponding detection subsystem according to the type to be tested in the test software, selecting an automatic test program to enter intelligent test, and storing a test result under a specified root directory by using a suffix name of xlsx;
in the second step, the detection subsystem selects products of different types based on the user management module; scanning and detecting connectivity of each interface of the equipment based on a system self-checking module; configuring each parameter of the equipment based on the parameter configuration module, and performing universal instrument control according to the model selected by the user, and injecting corresponding parameters for the exciter and the radio station to be tested; based on the test analysis module and the performance evaluation module, carrying out data analysis and evaluation on the parameters of the real-time acquisition equipment; based on the data query module, the database data is queried, the re-playback function of corresponding information and data is completed, and a test report is derived according to the test data;
In the second step, for the functional simulation of the automatic sensitivity test of the receiver of the ultrashort wave radio station, a fitting function model matched with the sensitivity signal is constructed by adopting a least square method so as to reduce the test range.
7. The method for applying the intelligent anti-interference ultrashort wave radio station test platform according to claim 6, wherein the construction process of the fitting function model is configured to include:
STEP1, taking the lowest value m of the measuring range as an initial value, inputting a (m+j) mu V function signal, and collecting sensitivity data S/N (signal to noise ratio) of an ultrashort wave radio receiver, wherein S is a useful signal, N is a noise signal, and j is an adjustment stepping value;
STEP2, based on the collected sensitivity data and the working principle of the receiver of the ultrashort wave radio station, selecting the following function fitting AM-S/N curve:
wherein k epsilon { R|k not equal to 0}, q epsilon { R|k not equal to 0}, R is an overall real set, k, a and q are respectively the proportionality coefficient, the arctangent function coefficient and the exponential coefficient of an arctangent fitting function, AM represents the amplitude input of a radio frequency signal and is the independent variable of the fitting function, A is used for replacing AM in the function derivation process, and q is the exponential coefficient of the independent variable;
STEP3, according to the approximation function characteristic in curve fitting, adopting a least square method solving function of the following formula to fit the optimal values of parameters k, a and q of an AM-S/N curve, so that the residual square sum ls is minimum:
wherein ,
，/>
representing an ith signal-to-noise ratio in the signal-to-noise ratio dataset;
STEP4, when Lss is at a minimum,
，/>
，/>
should be 0, the following equation is solved:
wherein ,
representing the sum of squares of the residuals formula biasing k, < >>
Representing the sum of squares formula of the residual error to bias a, < >>
Representing the sum of squares of the residuals formula biased against q,
s5, verifying the AM-S/N fitting function based on the solving result of the S4, and further determining that the fitting function is:
8. the method for applying the intelligent anti-interference ultrashort wave radio station test platform according to claim 7, wherein the method for applying the fitting function model comprises the following steps:
randomly selecting an input signal amplitude between measurement ranges, recording amplitude AM0, and recording the sensitivity of an ultrashort wave radio receiver at the point, wherein the sensitivity is S/N0;
according to a fitting function model of receiver sensitivity, calculating an input amplitude deviation value AM1 of an ultrashort wave radio receiver to obtain a value S/N2=S/N1+S/N0 closer to the sensitivity of the target ultrashort wave radio receiver;
And (3) adjusting the amplitude in a stepping way near the value S/N2=S/N1+S/N0 of the receiver sensitivity of the ultrashort wave radio station, so as to obtain a target value AM2 when the receiver sensitivity accords with the technical index of 10 dB.
9. The method for applying the intelligent anti-interference ultrashort wave radio station test platform according to claim 6, wherein the test procedure in the manual test mode is configured to include:
the method comprises the steps that firstly, a switch S1 and a switch S2 of a two-wire detector of an ultrashort wave radio station are respectively placed in a connection state and a manual test state, the other functional switches are all pulled down, and a band switch S10 and a band switch S11 are respectively switched to a radio frequency switching channel II and a sounding frequency switching channel I;
step two, running test software on a test platform, selecting a corresponding detection subsystem according to the type to be tested in the test software, and selecting a manual test program to select a system to enter a performance test item;
wherein the performance test items include: carrier power test, frequency error test, modulation characteristic test, single tone modulation test, side tone output level test, carrier noise test, spurious amplitude modulation test, spurious frequency modulation test, conventional sensitivity test, anti-interference sensitivity test, audio frequency response test, audio distortion test, squelch test, AGC test, data transmission power test, data transmission sensitivity test.
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