CN103900616B - A kind of Tacan simulator metering method and device - Google Patents

A kind of Tacan simulator metering method and device Download PDF

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Publication number
CN103900616B
CN103900616B CN201410153967.3A CN201410153967A CN103900616B CN 103900616 B CN103900616 B CN 103900616B CN 201410153967 A CN201410153967 A CN 201410153967A CN 103900616 B CN103900616 B CN 103900616B
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signal
frequency
radio
tacan
module
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CN103900616A (en
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毛宏宇
左力
胡卓林
安邵龙
池华佑
王栋杰
陈沫
董军涛
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AVIATION INSTRUMENT AND EQUIPMENT MEASURING GENERAL STATION AIR FORCE OF CPLA
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AVIATION INSTRUMENT AND EQUIPMENT MEASURING GENERAL STATION AIR FORCE OF CPLA
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C25/00Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass

Abstract

The present invention provides a kind of Tacan simulator metering device and system, described device realizes the Tacan simulator transmitting for directly gathering earth station and the radiofrequency signal received using radio-frequency technique, the system includes the modules such as level measurement module, modulation measurement module, azimuthal measurement module, azimuth rate measurement module, for realizing the calibration of the Tacan simulator bearing signal and the calibration of distance measuring signal.

Description

A kind of Tacan simulator metering method and device
Technical field:
The invention belongs to radio close navigation technical field, and in particular to a kind of Tacan simulator metering method and dress Put.
Background technology:
In early stage, air navigation wants to determine aircraft position it is necessary to use two or more Land Navigation Installations, and And positioning precision is very low, such location technology is without too big practical value.Then, in mid-twentieth century, in order to realize Accurate aerial location navigation, the suggestion by Fei get La Er telecommunications laboratory of the U.S. according to air force of U.S., naval, have developed Tacan system System.The original name of Tacan is TACAN, is the abbreviation of Tactical Air Navigation System- TACAN/tacan, It is a kind of short-range radio navigation system, tactical air navigation be in the world first can provide distance letter simultaneously for aircraft The short-range navigation system of breath and azimuth information.In the 1950s, earliest applied to the carrier-borne of U.S. army's aircraft carrier Machine navigates, but also is the important equipment that tanker aircraft completes air refueling mission, is developed into the North Atlantic Treaty Organize the military short-range navigation system of standard of each member state.Tacan system is one of important navigation system of my air force, utilizes tower Health navigation system can ensure aircraft along prebriefed pattern target, the rally of a group of planes and congregation and in complicated meteorology bar Vector aircraft is gone home with approach etc. under part.Therefore effectively Support is of crucial importance.
Tacan simulator is the azimuth information of quantitative simulation earth station, checks, tests, the calibration main skill of Tacan airborne equipment The special equipment of art index, the calibration method of producer is the method using " common apparatus+airborne standard Tacan+detector " at present Carry out, common apparatus mainly calibrates the common index of Tacan simulator(Frequency, power, level, frequency spectrum etc.), airborne standard Tacan It is to calibrate special index(Orientation, distance), detector is for providing working environment on a disengaging machine, is airborne equipment Power supply, control working condition, measuring technology index and the function such as output test result.This " integrated correction system " be traceable into On the simulator of mouth(The DTS102 in the U.S.).The problem of this method is present:Whole chain of tracing to the source is substantially 1:1 transmits, and is discontented with Sufficient GJB5109 requirement;In addition, this pattern of " airborne equipment calibration detection device " belongs to metering and hung upside down, at most can only It is checking, it is impossible to referred to as calibrate.Also there is part producer to have purchased a whole set of imported from America equipment and be used as measurement criteria, including it is airborne Tacan DTS-200, ground installation(Tacan simulator FR-1401/1400, supporting detector, precise distance measurement simulator PDME- 200), slightly it is better than 1 using the method being directly compared with import simulator, index during metering:1.
The content of the invention:
Aircraft close navigation detection device is for airborne navigational system test and the special equipment of Fault Isolation, its performance Whether index precisely consistent to be related to flight safety, significant.In order to solve deficiency of the prior art, the present invention needs to solve The certainly measurement and calibration problem of aircraft close navigation detection device, the metering method and device of proposition are able to ensure that aircraft close navigation The performance indications of detection device are accurate, solve the problems, such as that such special equipment can not measurement and calibration.
Also it is not applied in the development of Tacan simulator metering device for current radionavigational software and hardware, in tower The present invention is based on virtual instrument and software and radio technique in terms of health simulator quantitative study, will need hardware real in conventional method Existing modulation /demodulation function adds the compatibility and autgmentability of metering device by software desk Implementation.
Tactical air navigation is operated in 962~1213 megahertzs of frequency ranges, shares 252 radio frequency channels (X patterns and Y mode each 126 It is individual), its range accuracy is about ± 200 meters, reachable ± 1 ° of the angle measurement degree of accuracy.Coverage is by transmission power, receiving sensitivity With the restriction of ultrashort wave line-of-sight propagation rule, typical tactical air navigation operating distance is about 370 kms.It can be accommodated simultaneously 100 airplane rangings, number of aircraft is unrestricted during angle measurement.New tactical air navigation also has air to air (aircraft is to aircraft) Ranging and angle measurement function.Tactical air navigation uses polar coordinates (p~θ) location method, only needs a Tacan ground station can For Plane location, therefore the tactical air for being particularly suitable for carrying out operational activity centered on airport or aircraft carrier uses.
Tactical air navigation is made up of the airborne Tacan set and ground tacan set of mutual cooperation work.Airborne Tacan is set It is standby to include radio set, antenna, control and display device etc.;Ground tacan set includes radio set, day Line, device etc. is monitored and controlled.System carries out ranging using interrogator-responder system, i.e., launches inquiry at random by airborne Tacan set Pulse pair, after the reception of ground tacan set, then transponder pulse is sent in the form of pulse pair, airborne Tacan set is according to sending Interrogation pulse is to the spread speed for receiving time that transponder pulse undergone and radio wave, you can extrapolate aircraft to Tacan The distance of face platform.System angle measurement is realized by the phase relation between measuring basis pulse signal and pulse envelope signal 's.When aircraft is located at the different azimuth of Tacan ground station, reference pulse signal and arteries and veins received by its airborne Tacan set Rush between envelope signal and there is different phase relations, be assured that out side of the aircraft relative to Tacan ground station whereby Parallactic angle.
Tacan distance measuring signal produces principle:30 pairs, the interrogation pulse pair at intervals of 12 microseconds of transmitting per second on aircraft(In pairs The pulse of transmitting), earth station receives interrogation pulse and launches the reply pulse pair that is equally spaced to rear.Aboard receive answer The time of pulse pair compared with the time of interrogation pulse pair, draws time of the pulse radio in spatial, so as to be flown Machine and is shown to the distance of earth station.
Tacan location signal produces principle:The directional diagram of earth station antenna emitting radio waves is in have 9 lobes heart-shaped, And with 900 revs/min of rotations.The pulse signal that aircraft receives is amplitude-modulated form, and this amplitude modulation envelope is included by rotation heart 15 hertz of bearing signals caused by shape directional diagram and 135 hertz of bearing signals as caused by 9 lobe rotations, the phase of the two signals It is relevant with respect to the dimensional orientation of aircraft with earth station.Reference signal is needed for measure phase, therefore when cardioid pattern turns When crossing due east direction, one group of transmitting by 12 pulses to the reference pulse signal that forms, when 8 lobes (remove with it is heart-shaped most That lobe of big value coincidence) in the maximum of each when turning over due east direction, also launch one group be made up of 6 pairs of pulses it is auxiliary Help reference pulse signal.Compare the phase of 15 hertz of bearing signals and reference pulse signal, it is rough with respect to aircraft to obtain earth station Orientation, ambiguity during accurate measurement orientation is eliminated with it.Compare the phase of 135 hertz of bearing signals and auxiliary base pulse signal Earth station is obtained with respect to the accurate orientation values of aircraft.
The equipment important parameter measuring method
(1)Frequency is examined and determine.
The frequency for the radiofrequency signal launched earth station simulator is examined and determine.
(2)RF pulse spectrum is examined and determine.
Have to the peak value in the respective ± 0.25MHz bandwidth centered on deviateing radio frequency channel nominal frequency ± 0.8MHz frequency Effect radiant power is examined and determine.
Test condition is two kinds of mode of operations of Tacan and DME/P, respectively in -0.8MHz ,+0.8MHz, -2MHz ,+2MHz Examined and determine.
(3)Impulse waveform is examined and determine
The pulse envelope of signal is examined and determine.Including pulse rise time, fall time and pulse width.
Test condition is two kinds of mode of operations of Tacan and DME/P.
(4)Pulse is examined and determine coding
Response pulse code is examined and determine.
Test condition is two kinds of mode of operations of Tacan and DME/P.During Tacan pattern, A/G X, A/G Y, A/ are separately positioned on Examined and determine when A X, A/A Y;During DME/P patterns, examined and determine when being separately positioned on X, Y, W, Z.
(5)The coding calibrating of benchmark burst of pulses
Calibrating to primary standard group and prothetic group pregroup pulse code, including to the pulse spacing of X radio frequency channels and Y radio frequency channels, main base The repetition rate of pregroup and prothetic group pregroup is examined and determine.
Test condition is, to primary standard group, to be examined and determine when being separately positioned on A/G X, A/G Y, A/A X, A/A Y;It is right Prothetic group pregroup, examined and determine when being separately positioned on A/G X, A/G Y.
(6)Random filler pulse calibrating
Without request signal and do not launch it is main and auxiliary help reference pulse group under the conditions of, to random filler pulse logarithm purpose examine It is fixed.
Test condition is that it is 500,2000,5000 and 8000 to set filling rate respectively.
(7)Examine and determine in orientation
The bearing signal of the simulation ground signal sent to equipment under test is examined and determine;
Test condition is that the scope for setting target bearing to be stated according to accredited instrument is set.
(8)Modulation degree is examined and determine
The modulation degree of transmission signal is examined and determine.
Test condition is that target modulation degree is respectively set into 10%, 20% and 39%.
(9)Distance calibrating
What equipment under test was sent examines and determine apart from delay of the reply pulse with receiving interrogation pulse;
Test condition is that the scope for setting target range to be stated according to accredited instrument is set.
(10)Peak power is examined and determine
Simulator is earthward tested with detecting platform simulation airborne equipment and sends interrogation pulse, and simulator is tested by ground After showing that measured value, ECDC standard value are contrasted after calculating, so as to draw whether meet the requirements.
Brief description of the drawings:
Fig. 1 is the structured flowchart of the Tacan simulator metering device of the present invention;
Fig. 2 is the Tacan signal waveform that the device of the present invention collects.
Embodiment:
Herein below elaborates Figure of description is combined to the embodiment of the present invention:
Calibrating installation in the prior art is by analyzing unmodulated vision signal, so that it is determined that detection is set It is standby whether qualified.And the actual signal of Tacan system is 950MHz ~ 1213MHz, only pass through the detection ability to radiofrequency signal Whether qualified it is accurately positioned equipment under test;
Invention introduces radio-frequency technique, by NI RF vector signal generator PXI-5670 and NI RF vector signals point Analyzer PXIe-5663(Including low-converter, digitizer and mixed frequency signal generator), realize directly collection earth station simulation The radiofrequency signal that device sends and receives.
The workflow of Tacan calibration system be divided into reception and transmitting two kinds, receive process mainly receive bearing signal and Distance measurement inquiring signal, this process are also to realize the calibration process of bearing signal;Emission process mainly launches ranging response letter Number, by above-mentioned principle, ranging needs question-response, and location then only needs to receive and demodulate, and this process is mainly real The calibration of existing distance measuring signal.
Referring to Fig. 1, the device of the invention is based on PXI bussing techniques, and Devices to test includes Tacan test equipment and microwave Land test equipment, is the metering device of a synthesis, i.e. microwave landing metering device is designed as with Tacan simulator metering device One.The metering device of Tacan simulator includes low noise power amplifier(PXI-5691)(Not shown in Fig. 1), RF up-converter Device(PXI-5670), radio-frequency-down-converter(PXI-5601), arbitrary waveform signal generator, navigation signal processor, radio frequency work( Rate amplifier and the part of private cable six.Wherein, navigation signal processor includes digitized instrument(PXI-5622)Believe with mixing Number generator(PXI-5652).
Referring to Fig. 1, the radio-frequency power amplifier will input 5dBm pulse signals and be amplified to 500W, and the system includes defeated Enter isolator, high-power RF amplifying circuit, circulator, output isolator, limiter, power supply and RF switch;Radiofrequency signal After input isolator, into the high-power RF amplifying circuit, radio frequency amplifying circuit passes through after may amplify the signal to 500W Cross output isolator and be input to circulator, signal is exported to limiter from the output end of circulator, enters back into RF switch afterwards After export radiofrequency signal.The power supply provides voltage for high-power RF amplifying circuit and RF switch.
Described device reception signal process:Signal is by Tacan test equipment(Equipment under test)By cable connection to radio-frequency power On the circulator of amplifier, circulator transmits a signal to clipping module, does not input a signal into isolator(The work of circulator With being that signal is rotated to output in clockwise direction, not reverse transmission signal), then signal pass through RF switch, input To low noise power amplifier(PXI-5691)Input, low noise power amplifier output end access radio frequency down-conversion(PXI- 5601)Input(RF IN), mixed frequency signal generator(PXI-5652)RF OUT terminals connection radio-frequency-down-converter LO IN ends, for providing local oscillator parameter, the output end IF OUT of radio-frequency-down-converter(The principle of frequency conversion is:Input signal-mixing letter Number=output signal)Access digitizer(PXI-5622)IF IN ends, one is connected between PXI-5652 and PXI-5622 Line synchro, it is synchronous for clock.
Signal emission process:Arbitrary waveform signal generator(PXI-5421)Signal is produced, is exported to radio-frequency-up-converter Input, radio-frequency-up-converter itself carries local oscillator function, defeated by output end after signal frequency conversion by frequency conversion computing Go out to the input of power amplifier(That is the isolator of radio-frequency power amplifier), then putting by radio-frequency power amplifier Greatly, final signal is exported to equipment under test from circulator, completes the transmitting of signal.
The processing of signal is all carried out in navigation signal processor, and navigation signal processor includes mixed frequency signal Device(PXI-5652)And digitizer(PXI-5622)Two boards.
Intermediate frequency distance measuring signal is mainly converted on radio-frequency channel by wherein described radio-frequency-up-converter, is believed for navigational range Number transmitting;Radio-frequency-down-converter is used to the bearing signal of reception being converted to intermediate-frequency channel;Arbitrary waveform signal generator For producing distance measuring signal(Distance measurement inquiring pulse), signal is amplified to 500W by radio-frequency power amplifier;At navigation signal Device is managed to be used to handle the navigation signal Jing Guo frequency conversion, including azimuth-range signal.
For example, the calibration of distance signal(Reception and emission process):When have received distance measuring signal, fixing and prolonging according to agreement When one constant time after, you can to start the transmitting of ranging transponder pulse, produced first by PXI-5421 AWGs The pulse apart from transponder pulse, is then accessed upconverter, pulse signal modulation can be arrived Tacan by the module by raw one Working frequency range 962MHz-1213MHz, Tacan system is sent an acknowledgement to by antenna or cable mode;So as to realize tower The calibration of health system distance measuring signal.
In order to realize the measurement and calibration of above-mentioned Tacan ranging and location signal, the system is with the following method:
As shown in figure 1, the calibration of bearing signal(Receive process):Tacan signal is accessed by microwave cable first and calibrated The low noise amplifier of system(PXI-5691), the module can remove unrelated signal, amplify useful signal, letter after filtering Number access low-converter(PXIe-5601)Rf input terminal(RF IN), frequency can be 962MHz- by the module 1213MHz high-frequency signal downconverts to 50MHz intermediate-freuqncy signal, and the intermediate-freuqncy signal then is led into PXI- from IF OUT terminals 5622 input, PXI-5622 are digitizers, for handling intermediate frequency Tacan signal, pass through corresponding software in digitizer The resolving of module, Tacan bearing signal is obtained, so as to realize the calibration of bearing signal.Fig. 2 is the Tacan signal that device collects Waveform.
Software mainly uses virtual instrument and software and radio technique, is used cooperatively with hardware, completes navigation equipment middle-range From the generation with bearing signal, collection, modulation, demodulation and data processing and storage.
Software section is included with lower module:
Level measurement module:For realizing that level magnitudes measure, that is, measure the voltage of measured signal.
Modulation measurement module:For being resolved to the modulation degree of bearing signal.
Azimuthal measurement module:In order to obtain azimuth information, it is necessary to phase between calculating benchmark group and envelope zero point phase Difference, main and auxiliary benchmark burst of pulses is extracted from Tacan signal first, the zero point phase for then sub-electing envelope is obtained with The orientation of Tacan.
Azimuth rate measurement module:Compare the module of Orientation differences speed, for cooling water of units of measurement time inner orientation signal Rate of change.
Peak power detection module:Calibration system exports peak power, and measurement Tacan system can detect and measure peak value The ability of power.
Distance-measurement module:For gathering, resolving and store range information.
Range transmission module:Produce distance signal, transmitting range pulse.
Waveform detection module:For detecting the waveform index of bearing signal, equivalent to the function of oscillograph.
Frequency detection module:Detect the change of CF signal frequency.
Pulse frequency spectrum module:The purity of frequency spectrum is resolved, equivalent to the function of frequency spectrograph.
Random filler pulse module:For producing random filler pulse, according to the random filling of agreement transmitting of Tacan signal Pulse.
Other public modules:
Message sink coding and decoder module:
Message sink coding is mainly used in the compression of data, in favor of follow-up transmission.Common message sink coding algorithm includes JPEG compression, zip(LZ77 and Huffman encoding algorithm combination), MP3 and MPEG-2 etc..
Channel coding and decoder module:
Different with message sink coding, channel coding can add or rewrite data position, in order to reduce noise in transmission The influence come with attenuation band, obtains more preferable original transmission signal after decoding.
Examples detailed above is used for illustrating the present invention, rather than is limited.In the claims of the present invention It is interior, it is any that modifications of the present invention is both fallen within protection scope of the present invention.

Claims (1)

1. a kind of Tacan simulator metering device, it is characterised in that described device is realized using radio-frequency technique directly gathers ground The Tacan simulator transmitting of platform and the radiofrequency signal received, for realizing the calibration and ranging of the Tacan simulator bearing signal The calibration of signal;
Described device is designed based on PXI bussing techniques, and described device includes low noise amplifier, radio-frequency-up-converter, radio frequency Low-converter, arbitrary waveform signal generator, navigation signal processor, radio-frequency power amplifier and the part of private cable six;Its In:
Navigation signal processor includes digitized instrument and mixed frequency signal generator, and the digitized instrument and mixed frequency signal occur Line synchro is connected between device and is used for clock synchronization;
Intermediate frequency distance measuring signal is converted on radio-frequency channel by the radio-frequency-up-converter, the transmitting for navigational range signal;
The radio-frequency-down-converter is used to the bearing signal of reception being converted to intermediate-frequency channel;
The arbitrary waveform signal generator is used to produce distance measuring signal, and 5dBm pulses letter will be inputted by radio-frequency power amplifier Number it is amplified to 500W;
The navigation signal processor is used to handle the navigation signal Jing Guo frequency conversion, including azimuth-range signal;
The radio-frequency power amplifier includes input isolator, high-power RF amplifying circuit, circulator, output isolator, limit Width device, power supply and RF switch;Radiofrequency signal is after input isolator, into the high-power RF amplifying circuit, radio frequency Amplifying circuit may amplify the signal to after 500W and be input to circulator by exporting isolator, and signal exports from the output end of circulator To limiter, radiofrequency signal is exported after entering back into RF switch afterwards;The power supply is high-power RF amplifying circuit and radio frequency Switch provides voltage;
Described device reception signal process is:Signal is by tested Tacan simulator by cable connection to the radio-frequency power amplifier Circulator on, circulator transmits a signal to limiter, and then signal passes through RF switch, is input to the low noise amplifier Input, low noise amplifier output end access radio-frequency-down-converter rf inputs RF-IN, mixed frequency signal generator RF output end connects the local oscillator input LO-IN of radio-frequency-down-converter, for providing local oscillator parameter, in radio-frequency-down-converter Frequency signal output part IF-OUT accesses the signal input end of intermediate frequency IF-IN of digitizer;
Described device transmission signal process is:Arbitrary waveform signal generator produces signal, exports defeated to radio-frequency-up-converter Enter and hold INPUT, radio-frequency-up-converter itself carries local oscillator function, by frequency conversion computing, after signal frequency conversion, by output end RF-OUT is exported to the input of radio-frequency power amplifier, and then by the amplification of radio-frequency power amplifier, final signal is from ring Shape device exports to tested Tacan simulator the transmitting for completing signal;
Software section is included with lower module:
Level measurement module:For realizing that level magnitudes measure, that is, measure the voltage of measured signal;
Modulation measurement module:For being resolved to the modulation degree of bearing signal;
Azimuthal measurement module:In order to obtain azimuth information, it is necessary to which phase difference between calculating benchmark group and envelope zero point phase, first Main and auxiliary benchmark burst of pulses is first extracted from Tacan signal, the zero point phase for then sub-electing envelope is obtained with Tacan Orientation;
Azimuth rate measurement module:Compare the module of Orientation differences speed, the change for cooling water of units of measurement time inner orientation signal Rate;
Peak power detection module:Calibration system exports peak power, and measurement Tacan system can detect and measure peak power Ability;
Distance-measurement module:For gathering, resolving and store range information;
Range transmission module:Produce distance signal, transmitting range pulse;
Waveform detection module:For detecting the waveform index of bearing signal;
Frequency detection module:Detect the change of CF signal frequency;
Pulse frequency spectrum module:Resolve the purity of frequency spectrum;
Random filler pulse module:For producing random filler pulse, launch random filler pulse according to the agreement of Tacan signal;
Public module includes:
Message sink coding and decoder module:Message sink coding is mainly used in the compression of data, in favor of follow-up transmission;
Channel coding and decoder module:Add or rewrite data position, come in order to reducing noise and attenuation band in transmission Influence, more preferable original transmission signal is obtained after decoding.
CN201410153967.3A 2014-04-16 2014-04-16 A kind of Tacan simulator metering method and device Expired - Fee Related CN103900616B (en)

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