CN102544771A - Comprehensive real-time calibration method for multi-channel digital anti-interference antenna system - Google Patents
Comprehensive real-time calibration method for multi-channel digital anti-interference antenna system Download PDFInfo
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- CN102544771A CN102544771A CN2012100442949A CN201210044294A CN102544771A CN 102544771 A CN102544771 A CN 102544771A CN 2012100442949 A CN2012100442949 A CN 2012100442949A CN 201210044294 A CN201210044294 A CN 201210044294A CN 102544771 A CN102544771 A CN 102544771A
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Abstract
The invention provides a comprehensive real-time calibration method for a multi-channel digital anti-interference antenna system, which can effectively increase output signal to noise ratio of the system. The method is implemented by the following technical scheme and comprises the following steps: connecting an antenna array surface, channels and a signal processing plate between a power supply and a computer to form a self-calibration antenna system; transmitting a near-field signal and a far-field signal by using a transmitting antenna and a standard antenna at different time, calculating difference between amplitude and phase of two groups of signals output by a receiving channel and storing the difference value into FLASH; controlling the channels and the signal processing plate by using a computer through a serial port so as to be in a calibration state and performing system calibration by comparing the amplitude and the phase of the signal of each channel by a calibration algorithm stored in a field programmable gate array (FPGA); and providing analog inertial navigation information to the signal processing plate by using the computer through the serial port, automatically adjusting the main beam of the antenna according to the inertial navigation information by an anti-interference algorithm in the FPGA, and inhibiting the antenna to receive each external interference signal. According to the method, high efficiency and sustainability of system operation are guaranteed.
Description
Technical field
The invention relates to multi-channel digital anti-interference antenna system is carried out Calibration Method, particularly array antenna element error causes the antenna system decreased performance to carry out Calibration Method and method for processing signals.
Background technology
In the prior art, multi-channel digital anti-interference antenna system is made up of core components such as aerial array, filter, amplifier, frequency converter, analog to digital conversion and signal processing usually.These imperfect elements and module can cause multiple error; Will cause great influence to antenna system after these error stacks; Can cause the skew of antenna main beam; The anti-electronic jamming ability of reduction system influences the antenna system output signal-to-noise ratio, even causes the heavy losses of system's output signal-to-noise ratio.For multi-channel digital anti-interference antenna system, error can directly cause the skew of antenna main beam,
At present, to multi-channel digital anti-interference antenna system, two kinds of calibrating modes are arranged usually:
The one, the far field calibrating mode.In the calibrating mode of far field, antenna system includes only service aisle.Calibration operation is generally accomplished in the laboratory.The far field calibrating mode be through in the far field perpendicular to the position of antenna system front; Launch a point-frequency signal with the antenna system Polarization match; Record the signal amplitude and the phase place of each paths output through vector network analyzer; Confirm the modifying factor of each paths, modifying factor is stored among the FLASH of signal-processing board.System accomplishes calibration through calling the modifying factor of storing among the FLASH.The advantage of this calibrating mode is that calibration process has comprised all elemental errors of system; Shortcoming is that along with the variation of environment for use, the antenna system error can change thereupon.System is through working long hours, and device can wear out, and can cause systematic error to change equally.Therefore, system works need be returned the laboratory after a period of time, carries out error correction again.
The 2nd, the near field calibrating mode.Antenna system is made up of service aisle and calibrated channel, and in antenna array except the working cell, also have an alignment unit.At first, measure alignment unit and the S of multiplex operation unit in the antenna array through vector network analyzer
21Then, computer is in align mode through serial ports control antenna system, and the boresight antenna emission of calibrated channel in antenna array be frequency signal a bit, records the signal amplitude and the phase place of each road service aisle output; Because the alignment unit that the first step is recorded by vector network analyzer and the S of multiplex operation unit
21Do not belong to systematic error, therefore, need the signal matrix that front two pacings go out is poor, obtain systematic error, utilize the systematic error that obtains to confirm the modifying factor of each paths, modifying factor is stored among the FLASH of signal-processing board.System accomplishes calibration through calling the modifying factor of storing among the FLASH.The advantage of this calibrating mode is that calibration process can carry out in real time; Shortcoming is that this calibration steps has only carried out calibrate, behind the antenna array, owing to influence each other, has inconsistency between each unit equally, so the inconsistency of antenna element can influence systematic function equally.
Summary of the invention
The objective of the invention is weak point, provide a kind of and can effectively improve system's output signal-to-noise ratio to above-mentioned prior art, can be to the digital anti-interference method of the self correcting multipath that multi-channel digital anti-interference antenna system calibrates comprehensively.
Above-mentioned purpose of the present invention can reach through following measure: comprehensive real time calibration method of a kind of multi-channel digital anti-interference antenna system is characterized in that comprising the steps:
(1) antenna array 1, channel 2, the signal-processing board 3 with reception antenna group 6 and transmitting antenna 7 formations is connected in composition self calibration antenna system between power supply 4 and the computer 5;
(2) place a standard antenna 12 with the system antenna Polarization match in the far field perpendicular to the direction of antenna array 1; Standard antenna 12 is linked to each other with signal source 13; Opening signal source 13; Reception antenna group 6 forms digital signal after the far-field signal of receiving is passed through receive path 8 corresponding filter circuit, amplifying circuit, frequency converter and the AD conversion that link to each other, and reads each road signal amplitude and phase place by the computer 5 that contains AccessPort software and ISE software;
(3) the shutdown signal source 13; Computer 5 produces some signal frequently, after reception antenna group 6 is received the near-field signals of being sent by transmitting antenna 7 through the frequency source of serial ports commands for controlling transmission channel 9; Through forming digital signal after receive path 8 corresponding filter circuit, amplifying circuit, frequency converter and the AD conversion that link to each other; By each road signal amplitude and phase place of computer 5 fetch channels output, and with step 2 in the data that obtain poor, this difference is stored among the FLASH11;
(4) computer 5 is in align mode through serial port control signal disposable plates 3; The calibration algorithm that prestores among the FPGA10 is a benchmark with one the tunnel; Compare the signal amplitude of other each path channels and reference channel, phase value is revised and weighting each road signal; The amplitude and the phase place of interchannel are consistent, accomplish system calibration;
(5) computer 5 provides the inertial navigation information of simulation to signal-processing board 3 through serial ports; The anti-interference algorithm that FPGA10 is built-in; Then, make it aim at the preset bearing according to inertial navigation information self-adapting adjustment antenna main beam, and the suppressing antenna reception of various interference signals to external world.
The invention has the beneficial effects as follows:
The present invention combines far field calibration and near field these two typical calibration stepss of calibration, has solved the incompleteness of traditional multi-channel digital jamproof system calibration.Adopt the inventive method,
Can realize comprehensive calibration of multi-channel digital anti-interference antenna system.Calibrating for error of all devices that antenna system comprises contained in the present invention, therefore, guarantees the high efficiency of antenna system;
Can realize the real time calibration of multi-channel digital anti-interference antenna system, show that antenna system has carried frequency source and calibration algorithm, can carry out system calibration as requested at any time.That multi-channel digital anti-interference antenna system can be applied to is airborne, missile-borne and carrier-borne etc. multi-platform, and no platform environment of living in is different, and identical device neither be identical to environmental response.
The present invention can realize the real time calibration of antenna system, avoids in the conventional calibration method must antenna system being returned the trouble that error correction is carried out in the laboratory because error changes, thereby guarantees the continuity of antenna system work.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the self calibration multi-channel digital anti-interference antenna block diagram of system of the present invention.
Fig. 2 is the hexagon antenna array sketch map of the said system of Fig. 1.
Fig. 3 is the sketch map that the said system of Fig. 1 receives far-field signal.
Fig. 4 is the workflow diagram of the said system of Fig. 1.
Among the figure: 1 antenna array, 2 channels, 3 signal processing, 4 power supplys, 5 computers, 6 reception antennas, 7 transmitting antennas, 8 receive paths, 9 transmission channels, 10FPGA, 11FLASH, 12 standard antennas, 13 signal sources.
Embodiment
Consult Fig. 1.Self calibration multi-channel digital anti-interference antenna system is made up of antenna array 1, channel 2, signal-processing board 3, power supply 4 and computer 5.Wherein, antenna array 1 comprises reception antenna group 6 and transmitting antenna 7, and reception antenna group 6 is made up of six antenna elements jointly, accomplishes spacing wave and receives.Transmitting antenna 7 comprises an antenna element, is used for the emission of calibrating signal.Channel 2 comprises receive path 8 and transmission channel 9, and receive path 8 is made up of the LIULUTONG road, and every paths and a reception antenna unit are through the high frequency cable interconnection.Transmission channel 9 comprises a frequency source, realizes the generation of calibrating signal, links to each other with transmitting antenna 7 through high frequency cable.Six tunnel radiofrequency signals obtain six tunnel intermediate-freuqncy signals through filter circuit, amplifying circuit and frequency converter in the channel 2.Channel 2 interconnects through six high frequency cables with signal-processing board 3.Power supply and computer are accomplished the power supply and the serial ports control of antenna system through the low frequency socket.
Consult Fig. 2.Antenna array 1 in the self correcting multipath numeral anti-interference antenna system is made up of seven antennas, and wherein, center cell is a transmitting antenna 7, and six unit are reception antenna group 6 on every side.
Consult Fig. 3.In microwave dark room, system is installed on the turntable with self calibration multi-channel digital anti-interference antenna, the far field perpendicular to the direction of system antenna front place one with the system antenna identical standard antenna 12 that polarizes, standard antenna 12 links to each other with signal source 13.
Consult Fig. 4.Flow chart comprises with the lower part:
Microwave dark room is accomplished the parameter setting:
(1) antenna array 1, channel 2, signal-processing board 3 are connected in composition self calibration antenna system between power supply 4 and the computer 5;
(2) through computer 5 built-in AccessPort software and ISE software, calibration algorithm and digital anti-interference algorithm that compiling is got well download among the FPGA10 of signal-processing board 3;
(3) send the frequency source in the serial ports commands for controlling transmission channel 9 through computer 5; Produce a point-frequency signal; Transmitting antenna 7 in antenna array 1 sends to reception antenna group 6; AD conversion through in filter circuit, amplifying circuit, frequency converter and the signal processing 3 in the receive path 8 becomes digital signal with signal, reads each way word signal amplitude A among the FPGA through serial ports
1, A
2..., A
nAnd phase place
(4) send the serial ports instruction through computer 5 and close the frequency source in the transmission channel 9; Simultaneously place a standard antenna 12 with the system antenna Polarization match perpendicular to the direction of antenna array 1 in the far field; Standard antenna 12 is linked to each other with signal source 13; Opening signal source 13; Reception antenna group 6 becomes digital signal with signal after the far-field signal of receiving is passed through the AD conversion in receive path 8 corresponding filter circuit, amplifying circuit, frequency converter and the signal processing 3 that link to each other, and reads each way word signal amplitude A ' among the FPGA through serial ports
1, A '
2..., A '
nAnd phase place
(5) the digital signal amplitude and the phase place that above-mentioned steps 3 and step 4 are obtained are poor;
n=1; 2; 6, through AccessPort software this difference is stored among the FLASH11;
System calibration
(6) send serial ports commands for controlling channel 2 and signal-processing board 3 through computer 5; Make it be in align mode; Reception antenna group 6 in the antenna array 1 can be received the near-field signals that transmitting antenna 7 sends; After the AD conversion in filter circuit, amplifying circuit, frequency converter and the signal processing 3 in the receive path 8, signal is become digital signal, read each way word signal amplitude A among the FPGA through serial ports "
1, A "
2..., A "
6And phase place
(7) signal-processing board 3 is when being in align mode, and FPGA10 understands the data of FLASH11 storage in the invocation step 4, and the signal width of cloth becomes mutually
Because A
n=A "
n,
Therefore,
This signal is equivalent to the far-field signal that standard antenna 12 sends, and appoints to get one the tunnel and do benchmark, and other five road signals and reference signal are done comparison.
n=2; 3;, 6; Respectively 2～6 road signals are carried out the width of cloth and compensate mutually, make it consistent, promptly accomplish system calibration with the first via.
System works
(8) computer 5 makes it in running order, and to signal-processing board 3 the inertial navigation information of simulation is provided through serial ports control channel 2 and signal-processing board 3;
(9) the built-in anti-interference algorithm of FPGA10 is adjusted antenna main beam according to the inertial navigation information self-adapting, makes it aim at the preset bearing, and the suppressing antenna reception of various interference signals to external world.
Above-mentioned steps 1～5 is accomplished at microwave dark room, and antenna system only needs completing steps 6～9 to get final product when practical application.Through technique scheme, can improve the output signal-to-noise ratio of multi-channel digital jamproof system.
Claims (8)
1. comprehensive real time calibration method of a multi-channel digital anti-interference antenna system is characterized in that comprising the steps:
1) antenna array (1), channel (2), the signal-processing board (3) with reception antenna group (6) and transmitting antenna (7) formation is connected in composition self calibration antenna system between power supply (4) and the computer (5);
2) place a standard antenna (12) with the system antenna Polarization match in the far field perpendicular to the direction of antenna array (1); Standard antenna (12) is linked to each other with signal source (13); Opening signal source (13); Reception antenna group (6) forms digital signal after the far-field signal of receiving is passed through corresponding filter circuit, amplifying circuit, frequency converter and the AD conversion that links to each other of receive path (8), reads each road signal amplitude and phase place by the computer (5) that contains AccessPort software and ISE software;
3) shutdown signal source (13); Computer (5) is through the frequency source of serial ports commands for controlling send channel (9); Produce some frequency signal; After reception antenna group (6) is received the near-field signals of being sent by transmitting antenna (7), through forming digital signal after corresponding filter circuit, amplifying circuit, frequency converter and the AD conversion that links to each other of receive path (8), by each road signal amplitude and phase place of computer (5) fetch channel output; And with step 2 in the data that obtain poor, this difference is stored among the FLASH (11);
4) computer (5) is in align mode through serial port control signal disposable plates (3); The calibration algorithm that prestores among the FPGA (10) is one the tunnel being benchmark wherein; The signal amplitude and the phase place that compare other each path channels and reference channel; Each road signal is revised, the amplitude of interchannel and phase place are consistent, accomplish system calibration;
5) computer (5) provides the inertial navigation information of simulation to signal-processing board (3) through serial ports; The anti-interference algorithm that FPGA (10) is built-in; Then, make it aim at the preset bearing according to inertial navigation information self-adapting adjustment antenna main beam, and the suppressing antenna reception of various interference signals to external world.
2. comprehensive real time calibration method of multi-channel digital anti-interference antenna as claimed in claim 1 system; It is characterized in that; Said antenna array (1) comprises reception antenna group (6) and transmitting antenna (7); Reception antenna group (6) is made up of six antenna elements jointly, accomplishes spacing wave and receives.
3. comprehensive real time calibration method of multi-channel digital anti-interference antenna as claimed in claim 1 system is characterized in that transmitting antenna (7) comprises an antenna element, is used for the emission of calibrating signal.
4. comprehensive real time calibration method of multi-channel digital anti-interference antenna as claimed in claim 1 system; It is characterized in that; Said channel (2) comprises receive path (8) and transmission channel (9); Receive path (8) is made up of the LIULUTONG road, and every paths and a reception antenna unit are through the high frequency cable interconnection.
5. comprehensive real time calibration method of multi-channel digital anti-interference antenna as claimed in claim 1 system is characterized in that said transmission channel (9) comprises a frequency source, realizes the generation of calibrating signal, links to each other with transmitting antenna (7) through high frequency cable.
6. comprehensive real time calibration method of multi-channel digital anti-interference antenna as claimed in claim 1 system is characterized in that, six tunnel radiofrequency signals obtain six tunnel intermediate-freuqncy signals through filter circuit, amplifying circuit and frequency converter in the channels (2).
7. comprehensive real time calibration method of multi-channel digital anti-interference antenna as claimed in claim 1 system is characterized in that, channel (2) and signal-processing board (3) are through six high frequency cables interconnection.
8. comprehensive real time calibration method of multi-channel digital anti-interference antenna as claimed in claim 1 system is characterized in that, power supply and computer are accomplished the power supply of antenna system and controlled with serial ports through the low frequency socket.
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| CN102818942A (en) * | 2012-08-24 | 2012-12-12 | 湖北航天技术研究院计量测试技术研究所 | Far-field parameter calibration device and calibration method for antenna |
| CN103105614A (en) * | 2013-01-17 | 2013-05-15 | 陕西北斗恒通信息科技有限公司 | Space and time domain joint anti-jamming method based on inertial navigation assisting |
| CN106301469A (en) * | 2015-05-20 | 2017-01-04 | 北京理工大学 | A kind of width phase stability method of testing of coaxial cable |
| 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 |
| CN109193132A (en) * | 2018-09-13 | 2019-01-11 | 垣纬多媒体卫星通信（上海）有限公司 | A kind of compact low-power consumption Ka frequency range transmitting multi-beam phased array antenna |
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| CN111416649A (en) * | 2020-05-22 | 2020-07-14 | 西安电子科技大学 | Digital beam forming method based on zero intermediate frequency architecture |
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| CN102818942B (en) * | 2012-08-24 | 2014-08-20 | 湖北航天技术研究院计量测试技术研究所 | Far-field parameter calibration device and calibration method for antenna |
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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 |
| CN109193132A (en) * | 2018-09-13 | 2019-01-11 | 垣纬多媒体卫星通信（上海）有限公司 | A kind of compact low-power consumption Ka frequency range transmitting multi-beam phased array antenna |
| CN110958062A (en) * | 2018-11-30 | 2020-04-03 | 南京长峰航天电子科技有限公司 | Radio frequency multichannel calibration system and method |
| CN110958062B (en) * | 2018-11-30 | 2022-05-03 | 南京长峰航天电子科技有限公司 | Radio frequency multichannel calibration system and method |
| CN110417490A (en) * | 2019-07-30 | 2019-11-05 | 中国人民解放军91550部队 | A kind of array channel calibration system and method based on FPGA |
| CN112346023A (en) * | 2019-08-06 | 2021-02-09 | 北京华航无线电测量研究所 | Amplitude self-calibration module of passive radar |
| CN110865230A (en) * | 2019-10-18 | 2020-03-06 | 南京信息工程大学滨江学院 | Non-contact test pencil and measurement algorithm and calibration method thereof |
| CN110865230B (en) * | 2019-10-18 | 2021-09-07 | 南京信息工程大学滨江学院 | Non-contact test pencil and measurement algorithm and calibration method thereof |
| CN111416649A (en) * | 2020-05-22 | 2020-07-14 | 西安电子科技大学 | Digital beam forming method based on zero intermediate frequency architecture |
| CN114337863A (en) * | 2021-12-28 | 2022-04-12 | 合肥若森智能科技有限公司 | Phased array antenna calibration method, system, equipment and storage medium |
| CN114337863B (en) * | 2021-12-28 | 2023-11-07 | 合肥若森智能科技有限公司 | Phased array antenna calibration method, system, equipment and storage medium |
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