CN209390040U - A kind of high-precision blind landing ILS signal source - Google Patents
A kind of high-precision blind landing ILS signal source Download PDFInfo
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- CN209390040U CN209390040U CN201822187763.8U CN201822187763U CN209390040U CN 209390040 U CN209390040 U CN 209390040U CN 201822187763 U CN201822187763 U CN 201822187763U CN 209390040 U CN209390040 U CN 209390040U
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Abstract
The utility model discloses a kind of high-precision blind landing ILS signal sources, which is characterized in that including field programmable gate array, D/A converter, the first amplifier, the second amplifier, first filter circuit, the second filter circuit, switching circuit, modulator, RF amplifying circuit, power splitter, wave detector, comparator, integrator, Audio processing circuit and ALC driving circuit；It is programmed by same set of FPGA by two ways of digital signals output, guarantees the consistency of signal, signal source precision is improved based on DDM amplitude modulation depth difference principle, while improving signal source resisting temperature changing capability.
Description
Technical field
The utility model relates to a kind of instrument-landing-system, in particular to a kind of high-precision blind landing ILS signal source.
Background technique
Instrument-landing-system (Instrument Landing System, ILS) is translated into instrument landing system, blind landing system again
System, is the aircraft precision approach and Landing Guidance System being most widely used, including localizer (LOC) system, glide-path localizer
(GS) system, marker beacon (MB) system three parts.Its effect is to realize course by two beam radio signals of ground launch
Road and glide path guide establish one and are directed toward aerial virtual glissade by runway, and aircraft is determined certainly by airborne receiving equipment
The relative position of body and the path makes aircraft fly to runway along correct direction and steadily declines, finally realizes safe landing.By
In factors such as weather temperature, in order to safe landing, the signal source of transmitting must have high-precision and High temperature variation
Ability.
Utility model content
The purpose of the utility model is to overcome the above-mentioned deficiencies in the presence of the prior art, provide a kind of high-precision blind landing
ILS signal source.
In order to realize above-mentioned purpose of utility model, the utility model provides following technical scheme:
A kind of high-precision blind landing ILS signal source, including field programmable gate array, D/A converter, the first amplifier, second
Amplifier, the first filter circuit, the second filter circuit, switching circuit, modulator, RF amplifying circuit, power splitter, wave detector compare
Device, integrator, Audio processing circuit and ALC driving circuit；
The field programmable gate array generates two ways of digital signals according to SPI signal, and then two ways of digital signals passes through
The D/A converter is converted into two-way analog signal, and the first via analog signal is successively put by the first amplifier operation
Greatly, enter the switching circuit after the first filter circuit filtering, second analog signal is successively by second fortune
Enter the switching circuit after putting operation amplifier, second filter circuit filtering, the switching circuit on-off is controlled signal
It send to the Audio processing circuit, the Audio processing circuit output modulated signal, modulated signal is by the Audio processing electricity
Road is added on ALC loop by the ALC driving circuit, is controlled the detecting circuit variation that the wave detector generates, is changed and adjust
The electric current of electrically controlled attenuator in device processed, to control level of RF signals variation, final output high-precision blind landing ILS signal source.
RF input signal enters after the modulator is modulated, and amplifies through the RF amplifying circuit, then passes through the power splitter the
One output end generates RF output signal；A part of radio-frequency power is output to the detection by the second output terminal of the power splitter
What device, then generation signal " DET LOG " after the wave detector, carrier level reference voltage and the Audio processing circuit generated
Signal averaging forms signal " AM+REF ", described in signal " DET LOG " entrance that signal " AM+REF " and the wave detector generate
Comparator is compared, and difference is converted to electric current and drives the integrator, and the output of the integrator is driven by the ALC
Electronic feedback controls the electric current of electrically controlled attenuator in the modulator, forms feedback loop, makes RF output signal with constant function
Rate output；Wherein, the size of output power is determined by the numerical value of carrier level reference voltage.
The ALC driving circuit includes that the slope of curve adjusts circuit and curve offset adjusting circuit；The slope of curve adjusts electricity
Road includes multiple triodes, and the signal of the integrator output is adjusted according to DAC converter a output；Curve offset is adjusted
Circuit includes multiple triodes, and the signal of the integrator output is adjusted according to DAC converter a output.
The Audio processing circuit includes logarithmic amplifying circuit and piecewise linearity amplifying circuit；The logarithmic amplifying circuit packet
Include third amplifier and nonlinear device；The piecewise linearity amplifying circuit includes four high guaily unit；Audio input passes through the third
Amplifier enters the nonlinear device, exports the signal that conditioning is completed using the four high guaily unit.
Compared with prior art, the utility model has the beneficial effects that field programmable gate array generates two according to SPI signal
Railway digital signal, then two ways of digital signals is converted into two-way analog signal, send to Audio processing circuit and exports modulated signal,
Modulated signal passes through the Audio processing circuit, is added on ALC loop by ALC driving circuit, controls the wave detector and produces
Raw detecting circuit variation, changes the electric current of electrically controlled attenuator in modulator, so that level of RF signals variation is controlled, it is final defeated
High-precision blind landing ILS signal source out；It is programmed by same set of FPGA by two ways of digital signals output, guarantees the consistency of signal,
Signal source precision is improved based on DDM amplitude modulation depth difference principle, while improving signal source resisting temperature changing capability.
Detailed description of the invention:
Fig. 1 is the structural block diagram of the utility model.
Fig. 2 is the circuit connection diagram of field programmable gate array.
Fig. 3 is D/A converter, the first amplifier, the second amplifier, the first filter circuit, the circuit connection of the second filter circuit
Schematic diagram
Fig. 4 is the circuit connection diagram of switching circuit
Fig. 5 is the circuit connection diagram for including modulator.
Fig. 6 is the circuit connection diagram for including Audio processing circuit.
Fig. 7 is the circuit connection diagram for including wave detector, comparator and integrator.
Fig. 8 be include DAC converter circuit connection schematic diagram.
Specific embodiment
The utility model is described in further detail below with reference to test example and specific embodiment.But it should not be by this
The range for being interpreted as the above-mentioned theme of the utility model is only limitted to embodiment below, all to be realized based on the content of the present invention
Technology belongs to the scope of the utility model.
Such as Fig. 1, a kind of high-precision blind landing ILS signal source, including field programmable gate array, D/A converter, the first fortune
It puts, the second amplifier, the first filter circuit, the second filter circuit, switching circuit, modulator, RF amplifying circuit, power splitter, detection
Device, comparator, integrator, Audio processing circuit and ALC driving circuit；Such as Fig. 2, the field programmable gate array D8 according to
SPI signal generates two ways of digital signals, and then, such as Fig. 3, two ways of digital signals is converted into two by the D/A converter N703
Road analog signal, the first via analog signal successively pass through the first amplifier N704 operation amplifier, first filtered electrical
Enter the switching circuit after the filtering of road, second analog signal successively passes through the second amplifier N706 operation amplifier, institute
Enter the switching circuit after stating the filtering of the second filter circuit, the second order Bezier that first filter circuit is 20kHz is total again
For yoke pole to low-pass filter circuit, including amplifier N705 and peripheral circuit, second filter circuit is the second order shellfish of 300kHz
Sai Er complex conjugate poles are to low-pass filter circuit, including amplifier N707 and peripheral circuit；Such as Fig. 4, the switching circuit includes three
A switch N906, N907, N908, the switching circuit on-off control send signal to the Audio processing circuit, the audio
Conditioning circuit exports modulated signal, and modulated signal is passed through the Audio processing circuit, is added to by the ALC driving circuit
On ALC loop, the detecting circuit variation that the wave detector generates is controlled, the electric current of electrically controlled attenuator in modulator is changed, thus
Control level of RF signals variation, final output high-precision blind landing ILS signal source.
After being modulated such as Fig. 5,6,7,8, RF input signal into the modulator, amplify through the RF amplifying circuit,
Then RF output signal is generated by first output end of power splitter；The second output terminal of the power splitter is by a part of radio frequency
Then power output generates signal " DET LOG " after the wave detector, carrier level reference voltage and described to the wave detector
The Signal averaging that Audio processing circuit generates forms signal " AM+REF ", the signal that signal " AM+REF " and the wave detector generate
" DET LOG " is compared into the comparator, and difference is converted to electric current and drives the integrator, the integrator it is defeated
Out by the electric current of electrically controlled attenuator in modulator described in the ALC driving circuit feedback control, feedback loop is formed, RF is made
Output signal is exported with firm power；Wherein, the size of output power is determined by the numerical value of carrier level reference voltage.
The modulator include 200M~3.5GHz access 5 PIN diode HSMP-3832 (V30, V31, V32,
V33, V34) variable attenuator of current regulation in series and 5 PIN diode HSMP-3832 of 3.5~6GHz access
The variable attenuator of (V99, V100, V101, V102, V103) current regulation in series, can provide 40dB after they are calibrated
Linear regulation range.ALC driving circuit is modulator linearity circuit, " ALC_MOD_DRIVER_BIAS/ therein
GAIN_DAC " and " ALC_MOD_OFFSET_DAC " two DC voltages change slope and the offset of controlling curve respectively, and two
Signal is the control parameter of amplitude modulation calibration, the former influences amplitude modulation distortion；The latter not only influences amplitude modulation distortion, also change alc circuit
Radio frequency amplitude difference when open loop and closed loop, G of the two voltages respectively by 12-bits DAC converter AD7568 (D11) are defeated
Foot and the control of H output pin out.
The wave detector is a logarithmic amplifying circuit, mainly by amplifier OPA627AU (N38) and nonlinear device
MMPQ3906 (N40) etc. is constituted, and the operating point of detection logarithmic amplification is arranged in " DET_LOG_OFFSET_DAC ", by detection tube parameter
Influence, wave detector it is constant just without adjustment；" BULK_R_DAC " is the fine gains control signal of logarithmic amplifying circuit, equivalent
In a variable resistance, for reducing amplitude modulation distortion in complete machine amplitude modulation calibration.Wave detector forms a detection logarithmic signal
“DET_LOG”。
It include a logarithmic amplifying circuit, a piecewise linearity amplifying circuit, logarithmic amplifying circuit in Audio processing circuit
It is mainly made of amplifier OP27GS (N24) and nonlinear device LM3046M (N19) etc., piecewise linearity amplifying circuit is mainly by transporting
Put OP27GS (N26) composition.Audio signal " AM " is obtained by conditioning to be superimposed with " ALC_REF_DAC " carrier level reference voltage
It is formed " REF_PLUS_AM ", compared with detection logarithmic signal " DET_LOG ", difference is converted to electric current and drives by amplifier
The integrator that OP42GS (N41) is constituted, integrator output are changed the electric current of electrically controlled attenuator by ALC driving circuit, pass through control
System flow through series connected PIN diodes HSMP-3832 (V30, V31, V32, V33, V34) and HSMP-3832 (V99, V100, V101,
V102, V103) electric current change its RF impedance, the size of its decaying is controlled, to control final radio frequency output signal
Level.
12-bits D/A converter AD7568 (D11) provides above-mentioned accurate adjustable dc voltage " ALC_MOD_
DRIVER_BIAS/GAIN_DAC”、“ALC_MOD_OFFSET_DAC”、“DET_LOG_OFFSET_DAC”、“BULK_R_DAC”、
“ALC_REF_DAC”。
The above, the only detailed description of specific embodiment of the present invention, rather than limitations of the present invention.
Those skilled in the technology concerned in the case where not departing from the principle and range of the utility model, the various replacements made,
Modification and improvement should be included within the scope of protection of this utility model.
Claims (3)
1. a kind of high-precision blind landing ILS signal source, which is characterized in that including field programmable gate array, D/A converter, first
Amplifier, the second amplifier, the first filter circuit, the second filter circuit, switching circuit, modulator, RF amplifying circuit, power splitter, inspection
Wave device, comparator, integrator, Audio processing circuit and ALC driving circuit；
The field programmable gate array generates two ways of digital signals according to SPI signal, and then two ways of digital signals passes through described
D/A converter is converted into two-way analog signal, and first via analog signal successively passes through the first amplifier operation amplifier, described
One filter circuit filtering after enter the switching circuit, the second tunnel analog signal successively pass through the second amplifier operation amplifier,
Enter the switching circuit after the second filter circuit filtering, the switching circuit on-off control send signal to the audio
Conditioning circuit, the Audio processing circuit output modulated signal；
After RF input signal is modulated into the modulator, amplify through the RF amplifying circuit, then passes through the function point
The first output end of device generates RF output signal；A part of radio-frequency power is output to the inspection by the second output terminal of the power splitter
Then wave device generates rectified signal, the tune that carrier level reference voltage and the Audio processing circuit generate after the wave detector
Signal averaging processed forms superposed signal, and superposed signal enters the comparator with the rectified signal that the wave detector generates and compared
Compared with for the signal compared to drive the integrator, the output of the integrator passes through ALC driving circuit feedback control
Make the modulator.
2. high-precision blind landing ILS signal source according to claim 1, which is characterized in that the ALC driving circuit includes song
Line slope adjusts circuit and curve offset adjusts circuit；It includes multiple triodes that the slope of curve, which adjusts circuit, according to DAC converter
An output adjust the signal of integrator output；It includes multiple triodes that curve offset, which adjusts circuit, is converted according to DAC
One output of device adjusts the signal of the integrator output.
3. high-precision blind landing ILS signal source according to claim 1, which is characterized in that the Audio processing circuit includes
Logarithmic amplifying circuit and piecewise linearity amplifying circuit；The logarithmic amplifying circuit includes third amplifier and nonlinear device；It is described
Piecewise linearity amplifying circuit includes four high guaily unit；Audio input enters the nonlinear device by the third amplifier, then passes through
Cross the signal that the four high guaily unit output conditioning is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822187763.8U CN209390040U (en) | 2018-12-25 | 2018-12-25 | A kind of high-precision blind landing ILS signal source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822187763.8U CN209390040U (en) | 2018-12-25 | 2018-12-25 | A kind of high-precision blind landing ILS signal source |
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| Publication Number | Publication Date |
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| CN209390040U true CN209390040U (en) | 2019-09-13 |
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| CN201822187763.8U Active CN209390040U (en) | 2018-12-25 | 2018-12-25 | A kind of high-precision blind landing ILS signal source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617559A (en) * | 2018-12-25 | 2019-04-12 | 成都前锋电子仪器有限责任公司 | A kind of high-precision blind landing ILS signal source |
| CN115412111A (en) * | 2022-07-12 | 2022-11-29 | 北京中科睿谱科技有限公司 | Self-adaptive time-frequency domain receiver with spectrum sensing capability |
-
2018
- 2018-12-25 CN CN201822187763.8U patent/CN209390040U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617559A (en) * | 2018-12-25 | 2019-04-12 | 成都前锋电子仪器有限责任公司 | A kind of high-precision blind landing ILS signal source |
| CN115412111A (en) * | 2022-07-12 | 2022-11-29 | 北京中科睿谱科技有限公司 | Self-adaptive time-frequency domain receiver with spectrum sensing capability |
| CN115412111B (en) * | 2022-07-12 | 2023-07-04 | 北京中科睿谱科技有限公司 | Self-adaptive time-frequency domain receiver with spectrum sensing capability |
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