CN107809293A - A kind of receiving channel multichannel phase and amplitude correction device and bearing calibration - Google Patents
A kind of receiving channel multichannel phase and amplitude correction device and bearing calibration Download PDFInfo
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- CN107809293A CN107809293A CN201710930316.4A CN201710930316A CN107809293A CN 107809293 A CN107809293 A CN 107809293A CN 201710930316 A CN201710930316 A CN 201710930316A CN 107809293 A CN107809293 A CN 107809293A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
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- Electromagnetism (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to microwave signal process field, spy is related to a kind of receiving channel multichannel phase and amplitude correction device and bearing calibration.The present invention produces reference waveform by correction module, gathers the signal by A/D module and calculates phase and amplitude offset, so as to enter the correction of line amplitude and phase to passage.The method of the present invention have the advantages that amount of calculation it is small, can timing-compensation, precision it is high.
Description
Technical field
The present invention relates to microwave signal process field, spy is related to a kind of receiving channel multichannel phase and amplitude correction device
And bearing calibration.
Background technology
Microwave signal receiving channel include height put, be mixed, in put, the analog device such as A/D chips, different receiving channels
Due to manufacturing process or the difference of electric property, inevitably deposit difference characteristically, bring the response of each channel amplitude and
The inconsistency of phase response, when the response of each channel amplitude is different with phase response to cause the follow-up signal to handle, to secondary lobe
Offset has considerable influence with digital beam froming (DBF) performance, and precision is relatively low, and then influences the extraction to target in signal.
It is existing to be with amplitude correction method to different receiving channel phases：During fabrication, each passage is progressively surveyed
Examination, then obtains relevant parameter, then compensates, but for the dozens of even correction of individual receiving channels up to a hundred,
Correction takes time and effort, and after device repairs, is also not easy to re-calibrate.It is therefore desirable to propose that one kind is easy to multiple passages
The method quickly corrected, in order to on-line testing.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of receiving channel multichannel phase and amplitude correction device and
Bearing calibration.The present invention produces reference waveform by correction module, gathers the signal by A/D module and calculates phase and amplitude
Offset, so as to enter the correction of line amplitude and phase to passage.The present invention method have amount of calculation it is small, can timing-compensation, essence
Spend the advantages that high.
The technical scheme is that：A kind of receiving channel multichannel phase and amplitude correction device, including correction module,
N number of receiving channel, N number of A/D module, correction module are connected with each receiving channel input port, and receiving channel delivery outlet corresponds to respectively
Connect A/D module, it is characterised in that：Each receiving channel includes phase shifter, attenuator, the corresponding receiving channel letter of A/D module collection
Number, A/D module output connects with corresponding phase shifter, attenuator, and correction module produces reference waveform, after N number of receiving channel
Gathered by N number of A/D module, calculation process is carried out to the data of collection in A/D module and obtains phase and range error, according to phase
Position error amount sets phase shifter corrected value, sets attenuator corrected value according to amplitude error value, wherein N is natural number.
According to receiving channel multichannel phase as described above and amplitude correction device, it is characterised in that：Described correction
Module produces sine wave.
The invention also discloses a kind of receiving channel multichannel phase and amplitude correction method, including receiving phase correction and
Amplitude correction is received, receiving phase correction comprises the following steps：Reference waveform S (t), each road AD moulds are produced by correction module first
Block gathers sinusoidal waveform S (t) signal, and A/D module carries out Digital Down Convert processing to the signal of collection, and Digital Down Convert is handled
To I branch roads, Q finger values, according to formulaObtain the reception amount of phase shift of each passage Amplitude correction is received to comprise the following steps：Reference waveform S (t) is produced by correction module first,
Each road A/D module gathers sinusoidal waveform S (t) signal, and A/D module carries out Digital Down Convert processing to the signal of collection, and numeral is lower to be become
Frequency processing obtains I branch roads, Q finger values, obtains the reception amplitude amount of each passage
A/D module sets phase shifter corrected value according to the reception amount of phase shift of each passage, is set according to the reception amplitude amount of each passage
Attenuator corrected value is put, so as to realize to N number of receiving channels calibration；
Described Digital Down Convert processing concretely comprises the following steps：Local oscillation signal, local oscillation signal frequency and A/ are produced by NCO first
The centre frequency of intermediate-freuqncy signal is symmetrical with zero-frequency after D conversion, after the A/D conversion that described local oscillation signal gathers with A/D module
Intermediate-freuqncy signal carry out digital mixing, then carry out LPF, 2 times of data pick-up, then carry out LPF, data and take out
Take output I branch roads and Q branch roads.
According to receiving channel multichannel phase as described above and amplitude correction method, it is characterised in that：Described standard
Waveform is sine wave.
According to receiving channel multichannel phase as described above and amplitude correction method, it is characterised in that：Described standard
Waveform is 10us sinusoidal waveform.
According to receiving channel multichannel phase as described above and amplitude correction method, it is characterised in that：Receiving phase school
The step of positive step and reception amplitude correction step also include opening receiving channel.
According to receiving channel multichannel phase as described above and amplitude correction method, it is characterised in that：Each channel reception
Amount of phase shift is the average value of a hop count value among sampled point.
According to receiving channel multichannel phase as described above and amplitude correction method, it is characterised in that：Each channel reception
Amplitude amount is the average value of a hop count value among sampled point.
The beneficial effects of the invention are as follows：(1) correction module can be according to selecting different waveform, but preferably just in the present invention
String ripple, because being advantageous in that as calibration source the phase in formula 1 using sinusoidal waveformOrFor fixed value, AD is adopted
After sample and digital down-converted, the I branch roads of formula 5 and the Q branch roads of formula 6 are fixed value, so convenient to calculate amount of phase shift and amplitude
Value, because the present invention needs to be corrected hundreds of or even thousands of passages simultaneously, computing can be greatly reduced using sine wave
Amount.(2) parallel correction, correction rate are fast simultaneously for multichannel.(conventional method is corrected using timesharing more, and correction time is slow).(3) phase
Position and range value are higher using 80 points of average value, such precision.(conventional method uses median more；Also take whole values
Do it is average, but because signal initial period is often unstable, can also influence precision).In the present invention, sampled point number is general
For sampling clock and the product of waveform length, the value of middle one section of sampled point is then taken, because the front portion outside intermediate samples section
Or rear portion, typically burr can be produced due to microwave device physical cause, or have charge and discharge phenomena, so as to influence system accuracy.
(4) sampled using AD and ask for phase and range value with Digital Down Convert processing, precision is high.(the tradition of zero intermediate frequency data signal
In acquisition methods, quadrature phase detector device is realized by analog circuit, and the amplitude existed between I branch roads and Q branch roads is inconsistent
Property and the non-orthogonal property of phase, and can with temperature etc. change and drift about.The performance of quadrature digital signal obtained by this method refers to
Mark can not meet the requirement of high performance digital signal processing.And the digital down-conversion technology of direct intermediate frequency (IF) Sampling can obtain high property
The quadrature digital signal of energy.)
Brief description of the drawings
Fig. 1 is hardware block diagram；
Fig. 2 is A/D module processing figure；
Fig. 3 is oscillogram before and after correction.
Embodiment
Explanation of nouns：NCO (Numerically Controlled Oscillator), as coherent oscillator：Because two
The formation of individual orthogonal coherent oscillator signal with to be multiplied all be the result of digital operation, so its orthogonality can ensure completely
, as long as ensureing operational precision.
Below in conjunction with accompanying drawing, the present invention is described further.
As described in Figure 1, receiving channel multichannel phase of the invention and amplitude correction device include correction module, N number of connect
Passage, N number of A/D module are received, correction module is connected with each receiving channel input port, and receiving channel delivery outlet is connected respectively
A/D module, each receiving channel include phase shifter, attenuator, the corresponding receiving channel signal of A/D module collection, A/D module output with
Corresponding phase shifter, attenuator connection.The course of work of hardware system of the present invention is：Correction module produces reference waveform, such as just
String ripple, gathered after N number of receiving channel by N number of A/D module, calculation process is carried out to the data of collection in A/D module and obtained
Phase and range error are obtained, phase shifter corrected value is set according to phase error, sets attenuator to correct according to amplitude error value
Value, is corrected, wherein N is natural number automatically so as to realize to N number of receiving channel.
The invention also discloses the method for receiving channel multichannel phase and amplitude correction, including receiving phase to correct and connect
Receive amplitude correction,
When needing to carry out receiving phase timing, 10us sinusoidal waveform S (t) (sine waves are produced by correction module first
Length can be set according to being actually needed), while open all receiving channels (for can not having for no channel switch
This step), each road A/D module gathers sinusoidal waveform S (t) signal, and A/D module carries out Digital Down Convert processing to the signal of collection,
Digital Down Convert handles to obtain I branch roads, Q finger values, due toObtain the reception phase shift of each passage
AmountTotally 100 points (100 points=10MHz*10us), take being averaged for middle 80 amount of phase shift
Value, then convert thereof into six dataThen, (this paper shifting of phase shifter corresponding to setting
6) phase device digit is, completes receiving phase correction, finally, exit correction sequential, recover normal work sequential.
When needing to carry out reception amplitude correction, 10us sinusoidal waveform S (t) (sine waves are produced by correction module first
Length can be set according to being actually needed), while open all receiving channels (for can not having for no channel switch
This step), each road A/D module gathers sinusoidal waveform S (t) signal, and A/D module carries out Digital Down Convert processing to the signal of collection,
Digital Down Convert handles to obtain I branch roads, Q finger values, obtains the reception amplitude amount of each passage Totally 100 points (100 points=10MHz*10us), the average value of middle 80 amplitude amounts is taken,
Then, attenuator corresponding to setting (this paper attenuator digit is 6, wherein 16 be that maximum attenuation amount is 16dB), complete to receive
Amplitude correction, finally, correction sequential is exited, recover normal work sequential.
After the completion of receiving phase corrects or receives amplitude correction, A/D module sets phase shifter to correct according to phase error
Value, attenuator corrected value is set according to amplitude error value, N number of receiving channel corrected automatically so as to realize.
The present invention Digital Down Convert processing mode be：The system is realized that numeral is lower using digital mixing low pass filtering method and become
Frequency is handled.
The system requires that the sample rate of A/D conversion can be more than 10MHZ, and its selection is selected according to receiving channel bandwidth,
The centre frequency for inputting intermediate-freuqncy signal is the centre frequency of receiving channel, and NCO selects the negative value of centre frequency.Such as the present embodiment
The sample rate f of middle A/D conversionS=200MHz, input IF signal frequency are 50MHz, and final output data rate is 1 tunnel
10Msps arrowband I branch roads and Q branch roads.
Digital Down Convert processing concretely comprises the following steps in the present invention：- 50MHz the local oscillation signal and A/D first as caused by NCO
Intermediate-freuqncy signal after conversion carries out digital mixing, then carries out LPF, 2 times of data pick-up, then carries out low pass filtered
The arrowband I/Q data of ripple, 10 times of data pick-up output 10Msps.
Theory diagram is as shown in Fig. 2 f in figure0=50MHz,
Wherein analog intermediate frequency real signal is caused by correction module：
A (t) is the amplitude of signal in formula；f0For the centre frequency of intermediate-freuqncy signal；For the phase of signal；The band of signal
A width of B.
In formulaThe referred to as complex envelope of signal, it can be denoted as
In formula, xIAnd x (t)Q(t) be referred to as the I branch roads and Q branch roads of complex envelope, exactly digital frequency conversion obtain two
Individual mutually orthogonal component.
Upper branch road (abbreviation I branch roads) multiplier output signal shown in Fig. 2 is
Low-pass filtered device (LPF) obtains I branch roads afterwards：
And lower branch road (abbreviation Q branch roads) multiplier output signal is
Low-pass filtered device (LPF) obtains Q branch roads afterwards：
The present invention correction before and after waveform contrast as shown in figure 3, correction before waveform phase and amplitude it is all different, first correct
Phase, amplitude is then corrected again.In concrete operations, amplitude, post-equalization phase can also be first corrected.
The receiving channel multichannel phase of the present invention and the method for amplitude correction, can be applied in weather radar, carrier-borne thunder
Up to the phased-array radar field for waiting multichannel, using the technical method of the present invention, can be grasped in maintenance by the key of maintenance personal one
Complete, or when needing high-precision signal to handle, the correction of line amplitude and phase is regularly entered to passage, such as every rather
Clock is corrected automatically to system, you can is carried out system compensation in real time, can so be overcome by physics such as temperature, humidity, air pressure
Because the influence to device channels, make, its specific precision and shifting very high using the microwave system phase and amplitude precision of this method
Phase device is relevant with the digit of attenuator, as phase shifter be 8, then phase accuracy is reachableDegree, if attenuator is 8, it is maximum
16dB is decayed to, then amplitude precision is reachableDB, those skilled in the art by engine request, can then design the phase of different accuracy
With amplitude correction system.
Claims (8)
1. a kind of receiving channel multichannel phase and amplitude correction device, including correction module, N number of receiving channel, N number of AD moulds
Block, correction module are connected with each receiving channel input port, and receiving channel delivery outlet is connected respectively A/D module, and its feature exists
In：Each receiving channel includes phase shifter, attenuator, the corresponding receiving channel signal of A/D module collection, A/D module output with it is corresponding
Phase shifter, attenuator connection, correction module produce reference waveform, gathered after N number of receiving channel by N number of A/D module,
Calculation process is carried out to the data of collection in A/D module and obtains phase and range error, phase shifter is set according to phase error
Corrected value, attenuator corrected value is set according to amplitude error value, wherein N is natural number.
2. receiving channel multichannel phase according to claim 1 and amplitude correction device, it is characterised in that：Described school
Positive module produces sine wave.
3. a kind of receiving channel multichannel phase and amplitude correction method, including receiving phase correction and reception amplitude correction,
Receiving phase correction comprises the following steps：Reference waveform S (t) is produced by correction module first, each road A/D module collection is just
String waveform S (t) signals, A/D module carry out Digital Down Convert processing to the signal of collection, and Digital Down Convert handles to obtain I branch roads, Q
Finger values, according to formulaObtain the reception amount of phase shift of each passage
Amplitude correction is received to comprise the following steps：Reference waveform S (t) is produced by correction module first, each road A/D module collection is just
String waveform S (t) signals, A/D module carry out Digital Down Convert processing to the signal of collection, and Digital Down Convert handles to obtain I branch roads, Q
Finger values, obtain the reception amplitude amount of each passage
A/D module sets phase shifter corrected value according to the reception amount of phase shift of each passage, is set and declined according to the reception amplitude amount of each passage
Subtract device corrected value, so as to realize to N number of receiving channels calibration；
Described Digital Down Convert processing concretely comprises the following steps：Local oscillation signal is produced by NCO first, local oscillation signal frequency becomes with A/D
The centre frequency of intermediate-freuqncy signal is symmetrical with zero-frequency after alternatively, after the A/D conversion that described local oscillation signal gathers with A/D module
Intermediate-freuqncy signal carries out digital mixing, then carries out LPF, 2 times of data pick-up, then carries out LPF, data pick-up
Export I branch roads and Q branch roads.
4. receiving channel multichannel phase according to claim 3 and amplitude correction method, it is characterised in that：Described mark
Waveform is sine wave.
5. receiving channel multichannel phase according to claim 4 and amplitude correction method, it is characterised in that：Described mark
Waveform is 10us sinusoidal waveform.
6. receiving channel multichannel phase according to claim 3 and amplitude correction method, it is characterised in that：Receiving phase
The step of aligning step and reception amplitude correction step also include opening receiving channel.
7. receiving channel multichannel phase according to claim 3 and amplitude correction method, it is characterised in that：Each passage connects
Receive the average value that amount of phase shift is a hop count value among sampled point.
8. receiving channel multichannel phase according to claim 3 and amplitude correction method, it is characterised in that：Each passage connects
Receipts amplitude amount is the average value of a hop count value among sampled point.
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Cited By (10)
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|---|---|---|---|---|
| CN108802503A (en) * | 2018-07-24 | 2018-11-13 | 山东大学 | The compensation data system and method for solar radio radiation observation system multichannel frequency conversion |
| CN109560883A (en) * | 2018-03-27 | 2019-04-02 | 成都定为电子技术有限公司 | A kind of multi-channel synchronous receives system and bearing calibration |
| CN110299952A (en) * | 2018-10-18 | 2019-10-01 | 武汉滨湖电子有限责任公司 | A kind of series connection receives corrective network and bearing calibration |
| CN110365350A (en) * | 2019-06-24 | 2019-10-22 | 成都振芯科技股份有限公司 | Receiving channel quadrature alignment algorithm adaptability Enhancement Method and device |
| CN111044970A (en) * | 2019-12-10 | 2020-04-21 | 陕西凌云电器集团有限公司 | Real-time high-precision direction finding method and system |
| CN112255605A (en) * | 2020-11-24 | 2021-01-22 | 武汉滨湖电子有限责任公司 | Multichannel receiver gain compensation system for amplitude-comparison altimetry radar |
| CN113702701A (en) * | 2021-08-09 | 2021-11-26 | 成都玖锦科技有限公司 | Amplitude-phase characteristic measuring method based on comb wave signal |
| CN116991198A (en) * | 2023-09-28 | 2023-11-03 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
| CN117193471A (en) * | 2023-09-28 | 2023-12-08 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
| CN117193471B (en) * | 2023-09-28 | 2024-07-02 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
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| CN109560883A (en) * | 2018-03-27 | 2019-04-02 | 成都定为电子技术有限公司 | A kind of multi-channel synchronous receives system and bearing calibration |
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| CN110365350B (en) * | 2019-06-24 | 2021-11-16 | 成都振芯科技股份有限公司 | Method and device for enhancing adaptability of receiving channel orthogonal correction algorithm |
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| CN112255605A (en) * | 2020-11-24 | 2021-01-22 | 武汉滨湖电子有限责任公司 | Multichannel receiver gain compensation system for amplitude-comparison altimetry radar |
| CN112255605B (en) * | 2020-11-24 | 2023-08-22 | 武汉滨湖电子有限责任公司 | Multichannel receiver gain compensation system for amplitude comparison height measurement radar |
| CN113702701A (en) * | 2021-08-09 | 2021-11-26 | 成都玖锦科技有限公司 | Amplitude-phase characteristic measuring method based on comb wave signal |
| CN116991198A (en) * | 2023-09-28 | 2023-11-03 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
| CN117193471A (en) * | 2023-09-28 | 2023-12-08 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
| CN116991198B (en) * | 2023-09-28 | 2023-12-26 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
| CN117193471B (en) * | 2023-09-28 | 2024-07-02 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
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