CN208818825U - A kind of radio altimeter calibrating installation - Google Patents
A kind of radio altimeter calibrating installation Download PDFInfo
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- CN208818825U CN208818825U CN201821379034.6U CN201821379034U CN208818825U CN 208818825 U CN208818825 U CN 208818825U CN 201821379034 U CN201821379034 U CN 201821379034U CN 208818825 U CN208818825 U CN 208818825U
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- altimeter
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Abstract
A kind of radio altimeter calibrating installation is related to the high equipment detection field of wireless electrical measurement.The radio altimeter calibrating installation, it can be with the range information in continuous analog set distance range, it uses a kind of method that dynamic is tested, frequency mixer is modulated by FPGA controller, digital frequency synthesizer DDS and I/Q, modulation generates Beat Signal and extention noise signal, make altimeter that can more work under real conditions in this way, achievees the purpose that detect altimeter.Device design rationally, can simulate true altimeter working condition, and measurement accuracy is high, has a wide range of application.
Description
Technical field
The utility model relates to the high equipment detection field of wireless electrical measurement, in particular to a kind of radio altimeter calibrating dress
It sets.
Background technique
Radio altimeter (hereinafter referred to as altimeter) is a kind of a kind of measuring machine of use in industries such as unmanned plane, guided missiles
The device of body or body and ground or sea level relative altitude, it can export the height voltage proportional to height to automatic
Pilot, to guarantee the stabilized flight in scheduled height of body or body.
Currently, the measurement of altimeter uses static test, i.e., with the cable box simulation body or body of height equivlent
Flying height, altitude feature point is few, is highly unable to consecutive variations, cannot simulate true altimeter working condition, measurement essence
Spend low, application range is effective.
Summary of the invention
In view of the deficienciess of the prior art, the purpose of the utility model is to provide a kind of calibratings of radio altimeter to fill
It sets.
The technical scheme adopted by the utility model is a kind of radio altimeter calibrating installation, including shell and setting
It in the intracorporal power module of shell, is characterized in that, the first RF switch, the second RF switch, the first attenuator, the second decaying
Device, I/Q modulation frequency mixer, digital frequency synthesizer, analog-digital converter and FPGA controller, the radiofrequency signal of the first attenuator are defeated
The output end for entering end and altimeter connects, and the output end of the first attenuator is connect with the C-band signal end of I/Q modulation frequency mixer,
The signal output end of digital frequency synthesizer is connect with the mixing input terminal of I/Q modulation frequency mixer, and I/Q modulates the output of frequency mixer
End is connect with the input terminal of the second attenuator, and the output end of the second attenuator and the return signal input terminal of altimeter connect, mould
The input terminal of number converter and the voltage signal output end of altimeter connect, and the output end of analog-digital converter connects FPGA controller
Input terminal, the control with the control signal input of the first attenuator, the second attenuator respectively of the output end of FPGA controller
The control signal input connection of signal input part, digital frequency synthesizer.
In above scheme, it is additionally provided with the first RF switch on the line between the first attenuator and I/Q modulation frequency mixer,
The second RF switch is additionally provided on line between the second attenuator and altimeter.
The beneficial effects of the utility model are: the radio altimeter calibrating installation, it can be with continuous analog set distance model
Interior range information is enclosed, using a kind of method that dynamic is tested, i.e., by FPGA controller, digital frequency synthesizer DDS and I/Q
Frequency mixer is modulated, modulation generates Beat Signal and extention noise signal, makes altimeter more can work under real conditions in this way
Make, achievees the purpose that detect altimeter.Device design rationally, can simulate true altimeter working condition, measurement accuracy
Height has a wide range of application.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is radio altimeter calibrating installation structural schematic diagram in the utility model embodiment;
Fig. 2 is attenuator structure schematic diagram in the utility model embodiment;
Fig. 3 is the structural schematic diagram of digital frequency synthesizer in the utility model embodiment;
Fig. 4 is that altimeter exports height voltage acquisition block diagram in the utility model embodiment;
Fig. 5 is power supply structural block diagram in the utility model embodiment.
Specific embodiment
Keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing 1~Fig. 5
The utility model is described in further detail with specific embodiment.
The model of each component is as follows in the present embodiment: RF switch 2 is identical as the model of RF switch 6, is ADI company
Chip HMC550A;Attenuator 1 is identical as the model of attenuator 5, is the HMC1119 of ADI company;I/Q modulates frequency mixer 3
Model ADI company HMC8193, digital frequency synthesizer 4(DDS) model ADI company chip AD9854, FPGA
Controller 8 XC6SLX16 by XILINX company, the chip AD7626 of the model ADI company of analog-digital converter 7.
Radio altimeter calibrating installation in the present embodiment, including shell and setting be in the intracorporal power supply 12 of shell,
Power supply in the present embodiment generates 27V by Switching Power Supply (AC-DC), filters by two-stage π type, respectively altimeter and
FPGA controller power supply, power supply inside generate 5V, 3.3V and 1.2V for using for FPGA controller inside by multipath LDO
Power supply.
First RF switch and the second RF switch, for controlling outputting and inputting for microwave signal, before connecting signal,
In the range of whether the power that FPGA controller will detect the microwave signal sent by altimeter decays to setting, set if decaying to
Fixed range, then RF switch is connected, conversely, RF switch is disconnected, for protecting the device of rear class.
First attenuator, the microwave signal for exporting altimeter decay, and input attenuator is mainly realized to height
The microwave signal of degree table output decays.If being easily damaged I/Q modulation frequency mixer without decaying.
Second attenuator is decayed for the signal after being mixed the I of I/Q modulation frequency mixer output with Q, and simulation is different
Small-signal apart from lower reflection echo is output to the receiving end of altimeter.
Digital frequency synthesizer (DDS) realizes the company to modulating frequency for generating two-way orthogonal Q signal and I signal
Continue adjustable.
I/Q modulates frequency mixer, for receiving being mixed for altimeter output signal and Q signal and I signal, and generates and continuously may be used
The output up-conversion signal (i.e. cos (ω+Ω) signal after I/Q mixing) of tune gives the input terminal of altimeter.The component can disappear
Except image frequency, the filter circuit of periphery is reduced, wherein the frequency range of the port RF and the port LO is from 2.5GHz to 8.5GHz, I/
Q is mixed the frequency range of input terminal IF from dc(0 Hz) to 4GHz.
FPGA controller provides Phase synchronization for providing timing configuration and logic control for RF switch and attenuator
Clock signal.
Analog-digital converter, the height voltage letter for will receive are converted into digital signal;
LCD display unit, for the display to height voltage, height and Beat Signal.
The RF signal input end of first attenuator and the RF-OUT output end of altimeter connect, the output of the first attenuator
It holds and is connect with the RF mouth port of I/Q modulation frequency mixer, modulate mixing to I/Q for exporting the C-band signal generated by altimeter
Device, the Q signal that the I signal output end and Q signal output end of digital frequency synthesizer DDS is sequentially connected I/Q modulation frequency mixer are defeated
Enter end and I signal input terminal, the output end of I/Q modulation frequency mixer is connect with the input terminal of the second attenuator, the second attenuator
The connection of the RF-IN input terminal of output end and altimeter, the input terminal of analog-digital converter and the voltage signal output end of altimeter connect
It connects, the input terminal of the output end connection FPGA controller of analog-digital converter, the output end of FPGA controller is respectively at the first decaying
The control signal input of device, the control signal input of the second attenuator, the control signal input of digital frequency synthesizer
Connection.
The process detected using radio altimeter calibrating installation to high pressure gauge in the present embodiment is as follows:
Firstly, FPGA controller detects the power of the microwave signal of altimeter output whether in the range of setting, if
The first RF switch is then opened, the C-band altimeter output voltage of the 0-15V of high pressure gauge output is passed into the first attenuator,
I/Q will be entered by the first attenuator after voltage attenuation to 0-5V modulates frequency mixer, the signal of the 0-5V altimeter output to have decayed
It carries out being mixed output with the modulation I signal of digital frequency synthesizer DDS output and Q signal, this output signal is special with modulation
The signal of sign, change modulated signal, can simulation output different height under Beat Signal.
The I/Q modulation mixing principle that the present embodiment uses is as follows:
If input signal: S (t)=cos ω t, ω is carrier angular frequencies, and unit rad/s, modulated signal angular frequency is Ω,
Using complex signal expression I/Q modulation mixer output signal y (t), because of same DDS output I signal and Q signal, amplitude phase
Together, range value AI = AQ =1。
y(t) = AI/4 (ejωt + e-jωt)( ejΩt + e-jΩt) + AQ/4 (ejωt - e-jωt)( ejΩt - e-jΩt)
= 1/2(ej(ω+Ω)t + e-j(ω+Ω)t)=cos (ω+Ω) t formula (1)
In formula, t is the time, and the unit second, A is range value, and j is imaginary unit.
By adjusting Ω size, the variation of (ω+Ω) can be realized, and simulate height Beat Signal.Microwave signal into
After entering I/Q modulation frequency mixer, by various microwave devices, nonlinear properties can be all generated, these signals fill to a certain extent
When the interference signal of simulation clutter.
FPGA controller controls the continuously adjustable Beat Signal of DDS production, i.e. change modulated signal angular frequency Ω, after mixing
It is sent into altimeter input terminal.Converter constantly acquires the height voltage of altimeter output simultaneously, passes after being converted by converter
FPGA controller is passed, is exported by LCD display.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replacement, it should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be with the power
Subject to the protection scope that benefit requires.
Claims (2)
1. a kind of radio altimeter calibrating installation, including shell and setting are in the intracorporal power module of shell, which is characterized in that the
One RF switch, the second RF switch, the first attenuator, the second attenuator, I/Q modulate frequency mixer, digital frequency synthesizer, mould
Number converter and FPGA controller, the RF signal input end of the first attenuator and the output end of altimeter connect, the first decaying
The output end of device is connect with the C-band signal end of I/Q modulation frequency mixer, the signal output end and I/Q tune of digital frequency synthesizer
The mixing input terminal of frequency mixer processed connects, and the output end of I/Q modulation frequency mixer is connect with the input terminal of the second attenuator, and second declines
The return signal input terminal of the output end and altimeter that subtract device connects, the input terminal of analog-digital converter and the voltage signal of altimeter
Output end connection, analog-digital converter output end connection FPGA controller input terminal, the output end of FPGA controller respectively with
The control of the control signal input of first attenuator, the control signal input of the second attenuator, digital frequency synthesizer is believed
The connection of number input terminal.
2. radio altimeter calibrating installation as described in claim 1, which is characterized in that modulated in the first attenuator and I/Q
It is additionally provided with the first RF switch on line between frequency mixer, is additionally provided on the line between the second attenuator and altimeter
Two RF switches.
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CN201821379034.6U CN208818825U (en) | 2018-08-27 | 2018-08-27 | A kind of radio altimeter calibrating installation |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112558495A (en) * | 2020-11-27 | 2021-03-26 | 中国人民解放军火箭军工程大学 | Anti-interference semi-physical simulation system and method for radar altimeter |
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2018
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112558495A (en) * | 2020-11-27 | 2021-03-26 | 中国人民解放军火箭军工程大学 | Anti-interference semi-physical simulation system and method for radar altimeter |
CN112558495B (en) * | 2020-11-27 | 2022-04-22 | 中国人民解放军火箭军工程大学 | Anti-interference semi-physical simulation system and method for radar altimeter |
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