CN105548975B - High stability radio-frequency channel gain correction device and method - Google Patents
High stability radio-frequency channel gain correction device and method Download PDFInfo
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- CN105548975B CN105548975B CN201510918863.1A CN201510918863A CN105548975B CN 105548975 B CN105548975 B CN 105548975B CN 201510918863 A CN201510918863 A CN 201510918863A CN 105548975 B CN105548975 B CN 105548975B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- Radar, Positioning & Navigation (AREA)
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention belongs to radio-frequency channel gain calibration technical field, a kind of high stability radio-frequency channel gain correction device and method are specifically disclosed, described device includes pulse-modulated signal source, the first coupler, radio-frequency channel, power combiner, wave detector, ADC collection plates, microprocessor, the first programmable attenuator and the second coupler.Radio-frequency channel includes electrically controlled attenuator, the quantized data of microcomputer reads ADC collection plates collection, the difference of the amplitude equalizing value of two pulse-modulated signals of calculating, the different base value is compared, difference is drawn, and the electrically controlled attenuator is adjusted according to difference, realizes that channel gain is calibrated.The present invention can make the stability that radio-frequency channel gain reaches 0.2dB in a short time, meet the needs of multiband radar system external calibration pattern.
Description
Technical field
The invention belongs to radio-frequency channel gain calibration technical field, and in particular to a kind of high stability radio-frequency channel gain school
Standard apparatus and method.
Background technology
Radio-frequency transmitter, emitter, Radar signal receiver, radar external calibration equipment and high-precision radio frequency connect sending and receiving
Penetrate, repeater system is required for the system gain with high stability.It is fixed outside monostatic radar especially in radar external calibration system
Mark device proposes requirements at the higher level to radio-frequency channel gain stability.Active externally coefficient potentiometer provides accurately known thunder for radar system
Up to sectional area reference value, the stability of its gain is directly connected to the stability and precision of radar image actual measured results.
For different-waveband SAR (synthetic aperture radar), there is the monostatic radar externally coefficient potentiometer of the different-wavebands such as L, S, C, X,
Its calibration method is identical.Calibration signal source output frequency difference is the difference is that only, 1.25GHz arteries and veins is exported to L-band
Modulated signal, S-band output 3.2GHz pulse debugging signals, X-band output 9.6GHz pulse-modulated signals；Wave detector center
Frequency and bandwidth are different：To L-band, the frequency centered on 1.25GHz；To S-band, the frequency centered on 3.2GHz；To X ripples
Section, the frequency centered on 9.6GHz.
The content of the invention
(1) technical problems to be solved
The technical problem to be solved in the present invention be by using pulse ratio compared with calibrating mode, make radio-frequency channel gain short
Reach higher stability in time.
(2) technical scheme
In order to solve the above technical problems, the present invention proposes a kind of radio-frequency channel gain correction device, including impulse modulation letter
Number source, the first coupler, radio-frequency channel, power combiner, wave detector, ADC collection plates, microprocessor, the first programmable attenuator
With the second coupler, the pulse-modulated signal source is used for the calibration pulse-modulated signal for producing different frequency；First coupling
Clutch is connected with the pulse-modulated signal source, for the pulse-modulated signal as caused by pulse-modulated signal source to be divided into two
Point, a part is sent into the power combiner, and another part is sent into the radio-frequency channel；The radio-frequency channel is described for receiving
The pulse-modulated signal of first coupler output, is transported to second coupler；Described in second coupler receives
The pulse-modulated signal of the output of radio-frequency channel, and two parts are divided into, output of a portion as the radio-frequency channel
Signal, another part are sent into first programmable attenuator；First programmable attenuator is used to receive by the radio-frequency channel
The pulse-modulated signal of output, and the pulse-modulated signal decayed after be delivered to the power combiner；The power closes
Grow up to be a useful person for the pulse-modulated signal exported by the pulse-modulated signal source and the pulse exported by the radio-frequency channel to be adjusted
The wave detector is sent into after signal synthesis processed；The wave detector is used for the two-way pulse of the synthesis to power combiner output
Modulated signal carries out envelope detection, obtains two-way pulse envelope signal and they are conveyed into the ADC collection plates；The ADC
Collection plate is used to gather the two-way pulse envelope signal, and the quantized data after collection is transferred into the microprocessor；Institute
State microprocessor to be connected with the radio-frequency channel, first programmable attenuator and ADC collection plates respectively, connect for controlling with it
The state of each element connect is set and data transfer, wherein the radio-frequency channel includes electrically controlled attenuator, the microprocessor
The quantized data gathered for reading the ADC collection plates 6, analyzes effective impulse, calculates described two pulse-modulated signals
The difference of amplitude equalizing value, compared with a reference value that the difference is determined when external calibration, error DN values are drawn, and according to error DN
Value sends control signal, electrically controlled attenuator described in continuous fine adjustment, realizes that channel gain is calibrated.
The present invention also proposes a kind of radio-frequency channel gain calibration methods thereof, using described radio-frequency channel gain correction device,
And comprise the following steps：
Step S1, the pulse-modulated signal source is opened as internal calibration signal source；
Step S2, the ADC collection plates are started to gather and quantify the pulse envelope signal of the wave detector output；
Step S3, obtained according to the quantized result of the quantization by the radio-frequency channel and not by the radio-frequency channel
Pulse envelope signal difference in magnitude；
Step S4, by the difference in magnitude compared with an a reference value, the electricity is controlled to adjust decay according to comparative result
The attenuation of device.
Step S5, repeat step S1 to step S4, until the difference of the difference in magnitude and a reference value is in an error model
In enclosing.
(3) beneficial effect
The present invention can be such that radio-frequency channel gain reaches in a short time by the way of pulse amplitude compares
0.2dB stability, meets the needs of multiband radar system external calibration pattern.
Brief description of the drawings
Fig. 1 is the simplified block diagram of the high stability radio-frequency channel gain correction device of the present invention；
Fig. 2 is the concrete structure diagram of the high stability radio-frequency channel gain correction device of the present invention；
Fig. 3 is the flow chart of the high stability radio-frequency channel gain calibration methods thereof of the present invention.
Embodiment
The present invention is illustrated below in conjunction with the accompanying drawings.Special instruction, described examples of implementation are only as explanation mesh
, it is not limitation of the present invention.
Fig. 1 is the simplified block diagram of the high stability radio-frequency channel gain correction device of the present invention.It is as shown in figure 1, of the invention
Device include calibration signal source, radio-frequency channel, detection and digital sampling and processing and microprocessor.Wherein, calibration signal
Source 1 is pulse-modulated signal source, and for producing calibration signal and being sent into radio-frequency channel, the calibration signal is high-frequency narrow-pulse letter
Number.Radio-frequency channel is used to transmit calibration signal to detection and data acquisition module.Detection is used to produce with digital sampling and processing
The low-frequency pulse envelope signal of the raw calibration signal is simultaneously acquired quantization to the low-frequency pulse envelope signal, and will quantify to tie
Fruit is exported to microprocessor.Microprocessor is used to analyze the quantized result, and produces control signal accordingly and export to radio frequency and believe
Number, so as to adjust the gain of radio-frequency channel, realize the gain stability calibration of radio-frequency channel.
Fig. 2 is the concrete structure diagram of the high stability radio-frequency channel gain correction device of the present invention.As shown in Fig. 2 this hair
Bright transmitting frequency channel gain calibrating installation specifically includes pulse-modulated signal source 1, the first coupler 2, radio-frequency channel 3, power
Synthesizer 4, wave detector 5, ADC collection plates 6, microprocessor 7, the first programmable attenuator 8 and the second coupler 9.
Pulse-modulated signal source 1 is used for the calibration pulse-modulated signal for producing different frequency, and pulse-modulated signal source 1 is preferred
To use the arteries and veins harmonic that pulse width is 1KHz for 1 μ s, repetition rate, carrier frequency may be selected according to the application of radio-frequency channel 3
The central point frequency of different frequency range, L-band use 1.25GHz arteries and veins harmonics, and S-band uses 3.2GHz arteries and veins harmonics, and X-band uses
9.6GHz arteries and veins harmonics.
Pulse-modulated signal source 1 is preferably the internal electrically controlled attenuator for carrying fine-tuning gain, can be to output signal work(
Rate is finely adjusted, and it is met the dynamic input range of wave detector 5.Also, according to a kind of preferred embodiment, impulse modulation letter
It is controllable that number source 1 exports break-make, when carrying out radio-frequency channel calibration, opens arteries and veins and adjusts signal, after the completion of calibration, closes arteries and veins tune signal,
The normal work of radio-frequency channel 3 is not influenceed.
Because the unstability of device in itself can bring the short term variations of power output, the output in pulse-modulated signal source 1
Power can occur to change by a small margin in a short time.As described below, the present invention uses pulse difference value calibration method, it is allowed to impulse modulation
The power output of signal occurs to change by a small margin in a short time, so as to reducing to the output stability of pulse-modulated signal source 1 and
The requirement of precision.
First coupler 2 is preferably passive coupler, passive coupler stability of characteristics, is not occurred with external environments such as temperature
Change.First coupler 2 is connected with pulse-modulated signal source 1, and pulse-modulated signal passes through as caused by pulse-modulated signal source 1
It is divided into two parts after first coupler 2, a part is directly entered power combiner 4 and carries out detection, and another part is coupled into incidence
Frequency channel 3.
Radio-frequency channel 3 as shown in dotted line Back Word frame in Fig. 2, including cascade system connection LNA (low-noise amplifier) 31,
First wave filter 32, the first amplifier 33, delayer 34, the second programmable attenuator 35, the second wave filter 36, the second amplifier
37th, electrically controlled attenuator 38, power amplifier 39.Radio-frequency channel 3 is used for the pulse-modulated signal for receiving the output of the first coupler 2,
And export to the second coupler 9.
LNA 31 is connected with the first coupler 2, receives the RF pulse signal of the first coupler 2 output, the signal is entered
Row enhanced processing.
First wave filter 32 is connected with LNA31, receives the radio-frequency pulse after the amplification of LNA31 outputs, and the signal is carried out
Filtering.
First amplifier 33 is connected with the first wave filter 32, receives the radio frequency bandwidth signal of the first wave filter 32 output, right
The signal carries out two level amplification.
Delayer 34 is connected with the first amplifier 33, and is controlled by microprocessor 7, and it is used to amplify in the first amplifier 33
Signal afterwards enters line delay, the two-way radiofrequency signal of ingoing power synthesizer 4 is separated in time, and envelope waveform is not after detection
Can aliasing.In this embodiment, delayer 34 is preferably fiber delay time device, uses gain compensation measure in fiber delay line, makes
Radiofrequency signal power output after different length optical fiber is basically unchanged.According to a preferred embodiment of the present invention, delay
Device can adjust signal to carry out 2 μ s, 4 μ s, 6 μ s steppings to arteries and veins and be delayed.
Second programmable attenuator 35 is used for the gain for adjusting radio-frequency channel 3, preferably stepping step-by-step adjustment, to realize big model
Enclose gain-adjusted.In one embodiment of the invention, adjust programmable attenuator using 5dB steppings, be divided into fourth gear, i.e. 0dB,
5dB, 10dB, 15dB decay, and set different attenuations to obtain radio-frequency channel different gains value, the second programmable attenuator has
15dB gain-adjusted ranges.
Second programmable attenuator 35 cascades with the second wave filter 36, the second amplifier 37 and electrically controlled attenuator 38.Second filter
Ripple device 36 is used to carry out shaping filter to the radiofrequency signal after delay, filters out band stray caused by delayer and programmable attenuator
Component.Filtered radio-frequency pulse, which is exported to the second amplifier 37, to be made to export to electrically controlled attenuator 38 after further amplifying.
Electrically controlled attenuator 38 is the critical component for finely tuning channel gain, and it can continuously change under the control of microprocessor 7
Become channel gain, reach alignment purpose.In initial regulation, the attenuation of electrically controlled attenuator 38 is set as median, is easy to decline
Decrement is adjusted up and down.Electrically controlled attenuator 38 is preferably voltage-controlled continuous attenuator, realizes radio-frequency channel fine gains.According to the present invention
Preferred embodiment, obtain pulse difference error according to calculating by microprocessor 7, and be converted into control voltage, be sent to electricity
Controlled attenuator 38, realize radio-frequency channel gain calibration.
Power amplifier 39 connects the output being connected to electrically controlled attenuator 38 to electrically controlled attenuator and carries out power amplification.
Second coupler 9 receives the output signal of the power amplifier 39 of radio-frequency channel 3, and the signal is through the second coupler 9
After be divided into two parts, wherein be directly inputted into all the way radio-frequency channel 3 transmitting terminal load, as the radio-frequency channel 3 output believe
Number, another way enters the first programmable attenuator 8, enters back into power combiner 4.
First programmable attenuator 8 is used to receive the pulse-modulated signal exported by radio-frequency channel, and the signal is decayed
After be delivered to the power combiner 4.
Power combiner 4 is connected with wave detector 5, belongs to Passive Power synthesizer, for pulse-modulated signal source 1 is straight
Connect the signal of output and be sent into wave detector 5 after the signal synthesis that the coupling of radio-frequency channel 3 comes.
Wave detector 5 is connected with ADC collection plates 6, for carrying out envelope detection to two-way pulse-modulated signal, obtains pulse bag
Network signal.Wave detector 5 is preferably constant temperature wave detector, and because wave detector is more sensitive to variation of ambient temperature, therefore the present invention adopts
With constant temperature measures, local constant temperature is carried out to wave detector 5, influence of the variation of ambient temperature to detection precision is reduced, it is steady to improve calibration
Fixed degree.Such as by temperature perseverance degree at 60 DEG C.
ADC collection plates 6 are used to gather two-way detection pulse envelope, and the quantized data after collection is transferred into microprocessor 7.
ADC collection plates 6 are preferably high-precision adc collection plate, wherein using high-precision adc acquisition module and mass storage, with reality
The real-time collection and processing of existing data.
Microprocessor 7 respectively with delayer 34, the second programmable attenuator 35, the first programmable attenuator 8, electrically controlled attenuator 38
And ADC collection plates 6 connect, microprocessor 7 is used to control the state of above-mentioned each element to set and data transfer and processing.
Microprocessor 7 is used for the quantized data for reading the collection of ADC collection plates 6, analyzes effective impulse, two pulse before and after calculating
The difference of modulated signal amplitude equalizing value, compared with a reference value that the difference is determined when external calibration, draw error DN values, and root
Control signal is sent according to error DN values, continuous fine adjustment radio-frequency channel electrically controlled attenuator 38, realizes that channel gain is calibrated.
Specifically, microprocessor 7 is connected with ADC collection plates 6, for analyzing former and later two pulse envelope range values, meter
Calculate the difference of both amplitudes and compared with a reference value, the size and Orientation of a reference value is deviateed according to impulse amplitude difference, is produced not
Electrically controlled attenuator 38 in same control signal de-regulation channel.
Control line is simulated by low frequency to connect, direct current is sent by microcontroller 7 between electrically controlled attenuator 38 and microprocessor 7
Voltage control signal, to control the change in gain of electrically controlled attenuator 38.Radio-frequency channel gain calibration is the progressive mistake of a circulation
Journey, an electrically controlled attenuator 38 often being adjusted, ADC collection plates 6 will resurvey 32MB detection pulse envelopes, and analyze and process,
Calculate former and later two pulse differences and compared with a reference value.According to relative error result, control signal is produced by microprocessor 7
De-regulation electrically controlled attenuator 38, and so on circulate most 20 times, until former and later two pulse differences and a reference value phase of calculating
Ratio error result is small to negligible, then calibration completion.Using circulation calibration method, according to the regulation stepping of electrically controlled attenuator and always
Range is adjusted, it is general to set cycle-index to be less than 20 times.The reasonable effective cycle-index of setting, ensures that the calibration method can be
GN Normal Alignment is completed in effective degree.The invalid calibration situation of endless loop will not occur.
Microprocessor 7 is connected by two radical word logic control lines with delayer 34, and control delayer realizes 2 μ s, 4 μ s, 6
μ s third gear is delayed.Delayer 34 is connected with the second programmable attenuator 35, and the second programmable attenuator 35 in radio-frequency channel 3 is used to adjust
Channel gain is saved, is controlled by microprocessor 7, microprocessor 7 passes through two radical word logic control lines and the second programmable attenuator 35
And first programmable attenuator 8 connect, realize 00dB, 05dB, 10dB, 15dB difference stepping regulation gain function.
First programmable attenuator 8 of the second programmable attenuator 35 and the rear end of the second coupler 9 in radio-frequency channel 3 has connection
Dynamic relation, both attenuations change simultaneously in opposite direction, and both attenuation sums keep constant.When the gain of radio-frequency channel 3
In interior change in a big way, the calibration impulse amplitude through the ingoing power synthesizer 4 of radio-frequency channel 3 keeps constant, ensure that school
Quasi- pulse is in the range of 5 optimal input linear of wave detector, so as to carry out channel gain calibration using former and later two pulse differences.
That is, the attenuation increase XdB of an attenuator, the attenuation of another attenuator reduce XdB, so make entirely to calibrate
The overall gain of path is constant, and when channel gain carries out stepping regulation, two impulse amplitudes difference into wave detector converts very little,
So as to improve detection precision.For example, both attenuation sums are a fixed value, 15dB.I.e.：In radio-frequency channel 3
Two programmable attenuators 35 decay 0dB, the first programmable attenuator 8 decay 15dB；Second programmable attenuator 35 decay 5dB, the first journey
Control the decay of attenuator 8 10dB；Second programmable attenuator decay 10dB, the first programmable attenuator 8 decay 5dB；Second program control decay
Device decay 15dB, the first programmable attenuator 8 decay 0dB.Two programmable attenuators change in opposite direction so that channel gain exists
In a big way during interior regulation, the arteries and veins by radio-frequency channel 3 adjusts signal power to be basically unchanged, so that two arteries and veins into wave detector
Signal amplitude difference is adjusted to vary less, and pulse power is located in the wave detector range of linearity, and detection impulse amplitude difference can be used
Carry out channel gain calibration.
The detailed description of pulse difference value calibration method is as follows：
The output pulse of wave detector 5 is directly entered as calibration source pulse through the first coupler 2 by pulse-modulated signal source 1
P1, enter radio-frequency channel 3 through the first coupler 2, then enter the output pulse of wave detector 5 as radio frequency letter through the second coupler 9
Road pulse P2, because radio-frequency channel 3 uses delay technique, and pulse width is that 1 μ s, P1 and P2 is separated from each other in time, defeated
Going out waveform will not be overlapping.Pulse envelope is exported using the sampling detection device 5 of High Speed High Precision ADC collection plate 6, calculates P1 and P2 respectively
Impulse amplitude quantized value DNP1And DNP2, try to achieve both difference Δ DN=DNP2-DNP1.According to radio-frequency channel gain mark during external calibration
Determine result, the channel gain of the corresponding determination of each pulse difference DELTA DN.It is true by external calibration system during each self calibration
Fixed one group of standard Δ DN values (Δ DNstd).When carrying out channel gain calibration, according to the standard Δ DN of readingstdValue is surveyed with actual
Examination Δ DN values compare, and draw an error amount DiffDN, by error amount DiffDNEstimating needs to be added on electrically controlled attenuator 38
Control voltage, electrically controlled attenuator 38 in control voltage regulation channel is sent by microcontroller 7.Then proceed to gather wave detector 5
Pulse exports, and calculates P1 and P2 impulse amplitude quantized values DNP1And DNP2, try to achieve both difference Δ DN=DNP2-DNP1, and in benchmark
It is worth Δ DNstdCompare.So circulation, until difference DELTA DN and a reference value Δ DNstdCompare, error can be neglected, then channel gain school
Standard is completed.
In a calibration process, calibration signal source power output may occur to change in short term, but because what is compared is front and rear
The differences of two pulses and non-pulse absolute value, therefore, the change of signal source power output will not occur two pulse differences
Change.This calibration method reduces to be changed to calibration signal source output power stability requirement, the short-term of signal source power output
Change will not have an impact to calibration accuracy and stability.
The present invention is preferably to use high-precision high linearity ADC collection plates 6 and microprocessor 7, and ADC collection plates 6 are used to adopt
Collection quantifies the pulse envelope signal of wave detector output.A preferred embodiment of the invention, using 14bit Precision A/Ds C
Collection plate, 0~5V of dynamic input range, integral non-linear error are less than 2.5LSB, and the linearity is good.Use 14bit Precision A/Ds C
Sample quantization precision can be ensured, it is accurate to measure wave detector reality output amplitude；The linearity predominantly meets to input model in dynamic
In enclosing, change and relative when calibration signal source power output changes former and later two detection pulse absolute values for causing wave detector to export
In the case that difference is constant, the difference DELTA DN that collection quantifies output is constant, so the linearity of ADC collection plates 6 is to calibration accuracy
It is extremely important, it is the necessary condition for reducing calibration signal source output power stability.
With at least 32MB memory capacity, frequency acquisition 10MSPS, 14bits quantified precision on ADC collection plates 6.For
1 μ s pulse widths, the detection output pulse of 1Khz repetition rates, the ADC full memory capacity sampling times are 1.6 seconds, can be obtained
1600 group pulses.Arithmetic sum average treatment is carried out to 1600 group pulses, obtains P1 and P2 quantized values DNP1, DNP2.In software algorithm
Arithmetic average processing is all carried out to 1600 group pulses, most of system white noise and spike interference signal can be filtered out, is improved
Processing accuracy.
When calculating pulse amplitude values, using threshold discrimination method, because desired pulse width is 1 μ s, ADC sampling rates
For 10MSPS, 10 sampled points of detection pulse top can be ideally obtained, it is upper due to the output pulse of actual wave detector
Rising edge and trailing edge has the rising and falling time of 10% width, and pulse top can typically acquire 8~9 sampled points.
In data processing algorithm, a pulse threshold value is set, each sampled point is judged one by one, if there are continuous 3 samplings
Point is above pulse thresholding, it can be determined that is an effective impulse.To 15 sampled points are taken before and after effective impulse altogether, find out this 15
Maximum 8 in individual sampled point, ask the arithmetic sum of 8 maximums to be averaged again, obtain previous pulse P1 quantized value DNP1。
Then according to different delay times, second impulse sampling point starting position is calculated.If 2 μ s are delayed, from first pulse
15 sampled points after continue to take 15 sampled points, equally find out 8 points of maximum, obtain the average value of 8 arithmetic sums, make
For the latter pulse P2 quantized value DNP2；If the μ s of delay time 4, after 15 sampled points of first pulse prolong 20 and adopt
Sampling point takes 15 points again, equally finds out 8 points of maximum, obtains the average value of 8 arithmetic sums, as the latter of 4 μ s of delay
Individual pulse P2 quantized value DNP2；If the μ s of delay time 6, prolong 40 sampled points again after 15 sampled points of first pulse
15 points are taken, equally find out 8 points of maximum, obtain the average value of 8 arithmetic sums, prolong 6 μ s the latter pulse as after
P2 quantized value DNP2.As described above, the average value of the last arithmetic sum for obtaining whole effective impulse groups again, just obtains first
Pulse P1 average DNP1With second pulse average DNP2, obtain both difference Δ DN=DNP2-DNP1.By difference DELTA DN and outside
The a reference value Δ DN determined during calibrationstdIt is compared, if Δ DN is more than a reference value Δ DNstd, illustrate that pulse P2 is bigger than normal, i.e. radio frequency
Channel gain is higher, then controls electrically controlled attenuator increase attenuation；If Δ DN is less than a reference value Δ DNstd, illustrate that pulse P2 is inclined
Small, i.e. radio-frequency channel gain is relatively low, then controls electrically controlled attenuator to reduce attenuation.Above-mentioned circulation is so carried out, until difference DELTA
DN and a reference value Δ DNstdVery close to both errors in insignificant scope, complete by channel gain calibration.
Using pulse thresholding method of discrimination, the interference of spike can be skipped, spike typically only has 1~2 amount
Change pulse thresholding of the point more than setting, take continuous 3 sampled points to cross judgment criterion of the thresholding as effective impulse in the algorithm, energy
Enough exclude spike interference.Take 8 maximum points to be averaged each pulse in algorithm, and obtain whole effective impulse string arithmetic
The average value of sum, influence of the white noise to impulse amplitude is substantially reduced, improves calibration accuracy.
According to the preferred embodiment of the present invention, using high-frequency low-consumption fixed ampllitude phase-compensated cable connect each radio-frequency module and
Wave detector 5 and ADC collection plates 6, realize high frequency signal transmission.Using low-loss fixed ampllitude phase-compensated cable, can guarantee that in different temperatures
And during different frequency range, the pad value that cable is brought in itself is constant.The change of cable attenuation amount can directly influence calibration accuracy, choosing
With fixed ampllitude phase-compensated cable, the stability and precision of the radio-frequency channel gain calibration under varying environment and different frequency can be ensured.
Using Electrooptical-optoelectrical transformation technology, different length optical fiber radio-frequency channel gain correction device of the present invention and side are utilized
Method can obtain stable channel yield value after the completion of channel gain calibration.After the completion of calibration, internal pulses modulation calibration is closed
Signal source, in case calibration signal interferes to the useful signal for entering radio-frequency channel.
By taking monostatic radar externally coefficient potentiometer as an example, crossed in satellite before top in the short time, using above-mentioned channel gain calibrating installation
With method to radio-frequency channel carry out gain calibration, ensure satellite cross top during monostatic radar externally coefficient potentiometer gain stability.This
It is preferably high-speed ADC collection plate and microprocessor to invent the ADC collection plates 6 used and microprocessor 7, and conversion speed is high,
Whole calibration process can be completed in 2 minutes, meet the requirement of actual Orbital detection.Equally, it is it is suitable for other right
Radio-frequency channel gain stability requires high occasion.
Fig. 3 is the flow chart of the radio-frequency channel gain calibration methods thereof of the present invention.As shown in figure 3, the method for the present invention includes
Following steps：
Step S1, unbalanced pulse modulating signal source 1 is used as internal calibration signal source.
Optionally, the channel gain calibrated as requested sets the attenuation of the programmable attenuator 35 of radio-frequency channel 3, delay
The delay time of device 34, while it is median to set the attenuation of electrically controlled attenuator 38.
Step S2, ADC collection plates 6 are started to gather and quantify the pulse envelope signal of the output of wave detector 5.
Microprocessor 7 crosses thresholding and is considered effective impulse according to pulse thresholding method of discrimination, continuous three sampled points.If arteries and veins
It is invalid to rush, then gives up the group pulse, continues subsequent treatment.
Step S3, obtained by radio-frequency channel according to quantized result and not by the width of the pulse envelope signal of radio-frequency channel
Value difference.
All 32MB sampled datas are traveled through, obtain the amplitude of previous pulse and the latter pulse in whole effective impulse groups
Average, previous pulse average is subtracted with the latter pulse average, obtains the difference of two average pulse values.
Step S4, by the difference in magnitude compared with an a reference value, electrically controlled attenuator is controlled according to comparative result
Attenuation.
By the difference compared with calibrating a reference value, if the difference is bigger than normal than a reference value, illustrate that channel gain is higher, need
Increase the attenuation of electrically controlled attenuator 38, analog control voltage is produced according to deviation size by microprocessor 7, controls electricity to adjust
Attenuator 38 is to increase attenuation；If the difference is less than normal than a reference value, illustrate that channel gain is relatively low, it is necessary to reduce electrically controlled attenuator
38 attenuation, analog control voltage is produced according to deviation size by microprocessor 7, control electrically controlled attenuator 38 declines to reduce
Decrement.
Step S5, repeat step S1 to step S4, until the difference of the difference in magnitude and a reference value is in an error model
In enclosing.
After electrically controlled attenuator 38 changes attenuation, ADC collection plates 6 continue to gather envelope detection pulse and analyze judgement, directly
It is small to can be ignored to deviation in error range.According to the maximum attenuation range of electrically controlled attenuator 38 and each tune
Step value is saved to set cycle-index, cycle-index is for example set as 20 times.The preferred embodiment of the present invention is gathered using high-speed ADC
Plate 6 and high speed microprocessor 7, it is at most time-consuming 2 minutes to carry out 20 circulations.
The radio-frequency channel gain correction device and method of the present invention can obtain many-side in monostatic radar externally coefficient potentiometer
Using.Actual test result shows, 5 minutes before satellite crosses top, carries out radio-frequency channel gain calibration, general to be with 1 minute only
Adjustable complete, within the follow-up short time, the stability of radio-frequency devices in itself can ensure satellite cross top during monostatic radar determine
Mark the stability of device channel gain.After the completion of calibration, calibration signal source, the thunder for preventing internal signal jamming equipment from receiving are closed
Up to signal.
Described above is to be used to realize embodiments of the invention, and therefore, thus the scope of the present invention should not limit.This
Field it is to be understood by the skilled artisans that do not departing from any modification or partial replacement in the scope of the invention, belong to the present invention
Claim is come the scope that limits.
Claims (12)
1. a kind of radio-frequency channel gain correction device, including pulse-modulated signal source (1), the first coupler (2), radio-frequency channel
(3), power combiner (4), wave detector (5), ADC collection plates (6), microprocessor (7), the first programmable attenuator (8) and second
Coupler (9), it is characterised in that
The pulse-modulated signal source (1) is used for the calibration pulse-modulated signal for producing different frequency；
First coupler (2) is connected with the pulse-modulated signal source (1), for will be produced by pulse-modulated signal source (1)
Raw pulse-modulated signal is divided into two parts, and a part is sent into the power combiner (4), and another part is sent into the radio frequency letter
Road (3)；
The radio-frequency channel (3) is used for the pulse-modulated signal for receiving the first coupler (2) output, is transported to described
Second coupler (9)；
Second coupler (9) receives the pulse-modulated signal of the output of the radio-frequency channel (3), and is divided into two
Point, output signal of a portion as the radio-frequency channel (3), another part is sent into first programmable attenuator (8)；
First programmable attenuator (8) is used to receive the pulse-modulated signal exported by the radio-frequency channel (3), and by the arteries and veins
Modulated signal is delivered to the power combiner (4) after being decayed；
The power combiner (4) is used for the pulse-modulated signal that will be exported by the pulse-modulated signal source (1) and by described
The wave detector (5) is sent into after the pulse-modulated signal synthesis of radio-frequency channel (3) output；
The two-way pulse-modulated signal that the wave detector (5) is used for the synthesis to the power combiner (4) output carries out envelope
Detection, obtain two-way pulse envelope signal and they are conveyed to the ADC collection plates (6)；
The ADC collection plates (6) are used to gather the two-way pulse envelope signal, and the quantized data after collection is transferred into institute
State microprocessor (7)；
The microprocessor (7) respectively with the radio-frequency channel (3), first programmable attenuator (8) and ADC collection plates (6)
Connection, the state for controlling connected each element is set and data transfer, wherein
The radio-frequency channel (3) includes electrically controlled attenuator (38), and the microprocessor (7) is used to read the ADC collection plates
(6) quantized data of collection, effective impulse is analyzed, the difference of the amplitude equalizing value of described two pulse-modulated signals is calculated, by the difference
Compared with a reference value that value determines when external calibration, error DN values are drawn, and control signal is sent according to error DN values, continuously
The electrically controlled attenuator (38) is finely tuned, realizes that channel gain is calibrated.
2. radio-frequency channel gain correction device as claimed in claim 1, it is characterised in that the electrically controlled attenuator (38) and institute
State and control line is simulated by low frequency between microprocessor (7) connected, DC voltage control signal is sent by the microprocessor (7)
Control the change in gain of the electrically controlled attenuator (38).
3. radio-frequency channel gain correction device as claimed in claim 1, it is characterised in that the radio-frequency channel (3) includes
Delayer (34), the modulated pulse signal for being transmitted to radio-frequency channel (3) enter line delay.
4. radio-frequency channel gain correction device as claimed in claim 3, it is characterised in that the delayer is controlled by described micro-
Processor (7), to realize that multi gear is delayed.
5. radio-frequency channel gain correction device as claimed in claim 3, it is characterised in that the delayer (34) is prolonged for optical fiber
When device, wherein using gain compensation measure, make signal power output after different length optical fiber constant.
6. radio-frequency channel gain correction device as claimed in claim 1, it is characterised in that the radio-frequency channel (3) includes
Second programmable attenuator (35), second programmable attenuator (35) are used for the gain for adjusting radio-frequency channel (3).
7. radio-frequency channel gain correction device as claimed in claim 6, it is characterised in that second programmable attenuator (35)
There is interaction relation with first programmable attenuator (8), both attenuations change simultaneously in opposite direction, and both decay
Measure sum and keep constant.
8. radio-frequency channel gain correction device as claimed in claim 1, it is characterised in that the pulse-modulated signal source (1)
Inside carries the electrically controlled attenuator of fine-tuning gain, output signal power can be finely adjusted, it is met the wave detector
(5) dynamic input range.
9. radio-frequency channel gain correction device as claimed in claim 1, it is characterised in that the pulse-modulated signal source (1)
Output break-make it is controllable.
10. radio-frequency channel gain correction device as claimed in claim 1, it is characterised in that first coupler (2) is nothing
Source coupler.
11. radio-frequency channel gain correction device as claimed in claim 1, it is characterised in that the radio-frequency channel (3) includes
Amplifier and/or wave filter.
12. a kind of radio-frequency channel gain calibration methods thereof, it is characterised in that using as any one of claim 1 to 11
Radio-frequency channel gain correction device, and comprise the following steps：
Step S1, open the pulse-modulated signal source (1) and be used as internal calibration signal source；
Step S2, the ADC collection plates (6) are started to gather and quantify the pulse envelope signal of the wave detector (5) output；
Step S3, obtained according to the quantized result of the quantization by the radio-frequency channel (3) and not by the radio-frequency channel
(3) difference in magnitude of pulse envelope signal；
Step S4, by the difference in magnitude compared with an a reference value, the electrically controlled attenuator is controlled according to comparative result
(38) attenuation；
Step S5, repeat step S1 to step S4, until the difference of the difference in magnitude and a reference value is in an error range.
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| CN108008363B (en) * | 2016-10-27 | 2021-05-07 | 北京遥感设备研究所 | Calibration system for quantitative measurement radar |
| CN106712798A (en) * | 2016-12-30 | 2017-05-24 | 宇龙计算机通信科技(深圳)有限公司 | Method and device for calculating insertion loss of receiving circuit of radio frequency circuit, and radio frequency circuit |
| CN107765229B (en) * | 2017-10-19 | 2020-05-26 | 杭州睿达汽车科技有限公司 | Automatic calibration method for millimeter wave radar receiving link gain |
| CN109194182A (en) * | 2018-11-01 | 2019-01-11 | 北京京航计算通讯研究所 | Automate high pressure two fingers number wave impulse source generation method |
| CN112534302B (en) * | 2019-02-15 | 2022-02-11 | 华为技术有限公司 | Radar and gain control method |
| WO2020230503A1 (en) * | 2019-05-14 | 2020-11-19 | 古野電気株式会社 | Calibration information setting device, measurement device, calibration information setting method, measurement method, calibration information setting program, and measurement program |
| CN110346638B (en) * | 2019-07-01 | 2022-02-25 | 北京遥感设备研究所 | High-sensitivity detection circuit and method for monitoring output power of RF system |
| CN110346756B (en) * | 2019-07-10 | 2023-06-06 | 四川中电昆辰科技有限公司 | Signal envelope detection device and method and arrival time correction method thereof |
| CN110346755B (en) * | 2019-07-10 | 2023-06-27 | 四川中电昆辰科技有限公司 | Signal amplitude detection device and method and arrival time correction method thereof |
| CN111289951B (en) * | 2020-03-06 | 2022-03-25 | 南京长峰航天电子科技有限公司 | Wide pulse equivalent simulation method and device based on least square |
| CN113900071B (en) * | 2021-12-07 | 2022-03-04 | 湖南宜通华盛科技有限公司 | Output power detection circuit, adjustment method, detection method and phased array radar |
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