CN107809292A - A kind of transmission channel multichannel phase means for correcting and bearing calibration - Google Patents
A kind of transmission channel multichannel phase means for correcting and bearing calibration Download PDFInfo
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- CN107809292A CN107809292A CN201710930317.9A CN201710930317A CN107809292A CN 107809292 A CN107809292 A CN 107809292A CN 201710930317 A CN201710930317 A CN 201710930317A CN 107809292 A CN107809292 A CN 107809292A
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- phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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Abstract
The present invention relates to microwave signal process field, spy is related to a kind of transmission channel multichannel phase means for correcting and bearing calibration.The present invention produces reference waveform by each transmission channel, gathers the signal by transmitter, phase computing module and calculates phase pushing figure, so as to carry out the correction of phase to transmission channel.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 transmission channel multichannel phase means for correcting and correction
Method.
Background technology
Microwave signal transmission channel include height put, be mixed, in the analog device such as put, different transmission channels are due to manufacture
The difference of technique or electric property, difference characteristically is inevitably deposited, brings the inconsistency of each channel phases response,
Each channel phases response is different to cause transmitted waveform not synthesize correctly.
It is existing to be to different transmission channel method for correcting phase：During fabrication, each passage is progressively tested, then
Relevant parameter is obtained, is then compensated, but for the dozens of even correction of individual transmission channels up to a hundred, correction is time-consuming
Effort, and after device repairs, be also not easy to re-calibrate.It is therefore desirable to propose that one kind is easy to carry out quickly multiple passages
The method of correction, 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 transmission channel multichannel phase means for correcting and correction side
Method.The present invention produces reference waveform by each transmission channel, gathers the signal by transmitter, phase computing module and calculates phase
Position offset, so as to carry out the correction of phase to transmission channel.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 transmission channel multichannel phase means for correcting, it is characterised in that：Including N number of
Transmission channel, 1 common reception module, 1 transmitter, phase computing module, each transmission channel delivery outlet with common reception mould
Block input port is connected, and common reception modular outlets are connected with transmitter, phase computing module input port, and each transmission channel includes
Phase shifter, emission switch, the output of transmitter, phase computing module connect with corresponding phase shifter, emission switch, and transmitter, phase calculates
Transmission channel is opened in module timesharing, and the signal that the transmission channel leakage for gathering the corresponding moment is returned, each transmission channel produce
Reference waveform, gathered after common reception module by transmitter, phase computing module, to collection in transmitter, phase computing module
Data carry out calculation process and obtain phase error, phase shifter corrected value is set according to phase error, so as to realize to N number of
Transmission channel corrects automatically, and wherein N is natural number.
According to transmission channel multichannel phase means for correcting as described above, it is characterised in that：Described reference waveform is
Sine wave.
The invention also discloses a kind of transmission channel multichannel phase bearing calibration, it is characterised in that：Comprise the following steps：
Transmitter, phase timing is carried out, transmitting correction sequential is produced by transmitter, phase computing module first, timesharing is opened each
Individual transmission channel, each transmission channel timesharing produce reference waveform S (t), and the signal that transmission channel leakage is returned passes through common reception
After passage coupling, reference waveform S (t) signals of the corresponding transmission channel of transmitter, phase computing module collection, transmitter, phase calculates mould
Block carries out Digital Down Convert processing to the signal of collection, and Digital Down Convert handles to obtain I branch roads, Q finger values, due toObtain the transmitting amount of phase shift of each passageMoved according to transmitting
Phasor sets phase shifter corrected value；
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, described local oscillation signal and the intermediate frequency after the A/D conversion of collection
Signal carries out digital mixing, then carries out LPF, 2 times of data pick-up, then carries out LPF, data pick-up output
I branch roads and Q branch roads.
According to transmission channel multichannel phase bearing calibration as described above, it is characterised in that：Described reference waveform is
Sine wave.
According to transmission channel multichannel phase bearing calibration as described above, it is characterised in that：Described reference waveform is
10us sinusoidal waveform.
According to transmission channel multichannel phase bearing calibration as described above, it is characterised in that：Described transmitting amount of phase shift
For the average value of a hop count value among sampled point.
The beneficial effects of the invention are as follows：(1) transmission channel 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) it is higher using 80 points of average value, such precision.(conventional method uses median more；Whole values are also taken to be averaged
, but because signal initial period is often unstable, can also influence precision).In the present invention, sampled point number generally samples
The product of clock and waveform length, the value of middle one section of sampled point is then taken, because front portion or rear portion outside intermediate samples section,
Typically burr can be produced due to microwave device physical cause, or have charge and discharge phenomena, so as to influence system accuracy.(3) use
AD is sampled and is asked for phase and range value with Digital Down Convert processing, and precision is high.(traditional acquisition side of zero intermediate frequency data signal
In method, quadrature phase detector device is realized by analog circuit, amplitude inconsistency and phase between I branch roads and Q branch roads be present
The non-orthogonal property in position, and can change with temperature etc. and drift about.The performance indications of quadrature digital signal obtained by this method 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 it is high performance just
Hand over data signal.)
Brief description of the drawings
Fig. 1 is hardware block diagram；
Fig. 2 is transmitter, phase computing module processing figure；
Fig. 3 is transmitting correction timing diagram；
Fig. 4 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, transmission channel multichannel phase of the invention and amplitude correction device include N number of transmission channel, 1
Common reception module, 1 transmitter, phase computing module, each transmission channel delivery outlet with common reception module input port phase
Even, common reception modular outlets are connected with transmitter, phase computing module input port, and each transmission channel includes phase shifter, transmitting
Switch, the output of transmitter, phase computing module are connected with corresponding phase shifter, emission switch, and the timesharing of transmitter, phase computing module is opened
1~N of passage, and the signal that the transmission channel leakage for gathering the corresponding moment is returned.The transmitter, phase computing module of the present invention includes
A/D is converted, and A/D is converted for gathering reference waveform caused by transmission channel.
The course of work of hardware system of the present invention is：1~N of passage, each transmitting are opened in the timesharing of transmitter, phase computing module
Passage produces reference waveform, such as sine wave, is gathered after common reception module by transmitter, phase computing module, in transmitter, phase
Calculation process is carried out to the data of collection in computing module and obtains phase error, sets phase shifter to correct according to phase error
Value, is corrected, wherein N is natural number automatically so as to realize to N number of transmission channel.
The invention also discloses transmission channel multichannel phase correction method,
When needing to carry out transmitter, phase timing, transmitting correction sequential, timesharing are produced by transmitter, phase computing module first
All transmission channels are opened, (length of sine wave can basis by each transmission channel timesharing generation 10us sinusoidal waveform S (t)
It is actually needed setting), after the signal that transmission channel leakage is returned is coupled by common reception passage, transmitter, phase computing module is adopted
Sinusoidal waveform S (t) signals of the corresponding transmission channel of collection, transmitter, phase computing module are carried out at Digital Down Convert to the signal of collection
Reason, Digital Down Convert handle to obtain I branch roads, Q finger values, due toObtain the transmitting of each passage
Amount of phase shiftTotally 100 points (100 points=10MHz*10us), take the flat of middle 80 amount of phase shift
Average, then convert thereof into six dataThen, phase shifter corresponding to setting (this paper's
Phase shifters' digit is 6), to complete transmitter, phase correction, finally, exits correction sequential, recovers normal work sequential.
After the completion of transmitter, phase correction, transmitter, phase computing module sets phase shifter corrected value according to phase error, from
And realize and N number of transmission channel is corrected automatically.
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 transmission channel bandwidth,
The centre frequency for inputting intermediate-freuqncy signal is the centre frequency of transmission 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 transmission channel：
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 contrast of waveform is as shown in figure 4, waveform phase is different before correction before and after the correction of the present invention, waveform phase after correction
Unanimously.
The method of the transmission channel multichannel phase correction of the present invention, can be applied more in weather radar, shipborne radar etc.
The phased-array radar field of passage, using the technical method of the present invention, it can be completed in maintenance by the key operation of maintenance personal one
, or when needing high-precision signal to handle, the correction of transmitter, phase is regularly carried out to passage, such as every few minutes to system
Automatically corrected, you can carry out system compensation in real time, can so overcome by physics such as temperature, humidity, air pressure because pair setting
The influence of standby passage, make, the digit of its specific precision and phase shift very high using the microwave system phase and amplitude precision of this method
It is relevant, as phase shifter be 8, then phase accuracy is reachableDegree, those skilled in the art can then be designed different by engine request
The phase correction system of precision.
Claims (6)
- A kind of 1. transmission channel multichannel phase means for correcting, it is characterised in that：Including N number of transmission channel, 1 common reception mould Block, 1 transmitter, phase computing module, each transmission channel delivery outlet are connected with common reception module input port, common reception Modular outlets are connected with transmitter, phase computing module input port, and each transmission channel includes phase shifter, emission switch, launch phase Position computing module output is connected with corresponding phase shifter, emission switch, and transmission channel is opened in the timesharing of transmitter, phase computing module, and The signal of the transmission channel leakage at collection corresponding moment, each transmission channel produces reference waveform, after common reception module Gathered by transmitter, phase computing module, calculation process is carried out to the data of collection in transmitter, phase computing module and obtains phase Error, phase shifter corrected value is set according to phase error, N number of transmission channel corrected automatically so as to realize, wherein N is nature Number.
- 2. transmission channel multichannel phase means for correcting according to claim 1, it is characterised in that：Described reference waveform For sine wave.
- A kind of 3. transmission channel multichannel phase bearing calibration, it is characterised in that：Comprise the following steps：Transmitter, phase timing is carried out, transmitting correction sequential is produced by transmitter, phase computing module first, each hair is opened in timesharing Passage is penetrated, each transmission channel timesharing produces reference waveform S (t), and the signal that transmission channel leakage is returned passes through common reception passage After coupling, reference waveform S (t) signals of the corresponding transmission channel of transmitter, phase computing module collection, transmitter, phase computing module pair The signal of collection carries out Digital Down Convert processing, and Digital Down Convert handles to obtain I branch roads, Q finger values, due toObtain the transmitting amount of phase shift of each passageAccording to transmitting phase shift Amount sets phase shifter corrected value；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, and described local oscillation signal is believed with the intermediate frequency after the A/D conversion of collection Number carry out digital mixing, then carry out LPF, 2 times of data pick-up, then carry out LPF, data pick-up output I Branch road and Q branch roads.
- 4. transmission channel multichannel phase bearing calibration according to claim 3, it is characterised in that：Described reference waveform For sine wave.
- 5. transmission channel multichannel phase bearing calibration according to claim 3, it is characterised in that：Described reference waveform For 10us sinusoidal waveform.
- 6. transmission channel multichannel phase bearing calibration according to claim 3, it is characterised in that：Described transmitting phase shift Measure as the average value of a hop count value among sampled point.
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| CN201710930317.9A CN107809292A (en) | 2017-10-09 | 2017-10-09 | A kind of transmission channel multichannel phase means for correcting and bearing calibration |
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| CN109752594A (en) * | 2018-12-28 | 2019-05-14 | 北京航天测控技术有限公司 | A kind of multi-channel synchronous data acquisition method for correcting phase |
| CN110554331A (en) * | 2019-08-23 | 2019-12-10 | 武汉中科牛津波谱技术有限公司 | emission phase calibration system and method of nuclear magnetic resonance instrument |
| CN111708023A (en) * | 2020-08-20 | 2020-09-25 | 湖南雷远电子科技有限公司 | Phase inconsistency correction method and imaging system for millimeter wave multi-transmitting multi-receiving linear array |
| CN113438066A (en) * | 2021-08-26 | 2021-09-24 | 深圳市鼎阳科技股份有限公司 | Multi-channel device and signal processing method for multi-channel device |
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|---|---|---|---|---|
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| CN110554331A (en) * | 2019-08-23 | 2019-12-10 | 武汉中科牛津波谱技术有限公司 | emission phase calibration system and method of nuclear magnetic resonance instrument |
| CN110554331B (en) * | 2019-08-23 | 2022-01-11 | 武汉中科牛津波谱技术有限公司 | Emission phase calibration system and method of nuclear magnetic resonance instrument |
| CN111708023A (en) * | 2020-08-20 | 2020-09-25 | 湖南雷远电子科技有限公司 | Phase inconsistency correction method and imaging system for millimeter wave multi-transmitting multi-receiving linear array |
| CN113438066A (en) * | 2021-08-26 | 2021-09-24 | 深圳市鼎阳科技股份有限公司 | Multi-channel device and signal processing method for multi-channel device |
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Application publication date: 20180316 |