CN102544771B - 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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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 the method that the multi-channel digital anti-interference antenna system is calibrated, particularly pair array antenna element error causes the method that method that the antenna system hydraulic performance decline calibrates and signal are processed.
Background technology
In the prior art, the multi-channel digital anti-interference antenna system is comprised 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 impact to antenna system after these error stacks, can cause the skew of antenna main beam, the anti-electronic jamming ability of reduction system, affect the antenna system output signal-to-noise ratio, even cause the heavy losses of system's output signal-to-noise ratio.For the multi-channel digital anti-interference antenna system, error can directly cause the skew of antenna main beam,
At present, to the 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 finished in the laboratory.The far field calibrating mode be by in the far field perpendicular to the position of antenna system front, launch a point-frequency signal that mates with the antenna system polarization, record signal amplitude and the phase place of each paths output by vector network analyzer, determine the modifying factor of each paths, modifying factor is stored among the FLASH of signal-processing board.System finishes calibration by 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 equally systematic error to change.Therefore, system works need to be returned the laboratory after a period of time, re-starts error correction.
The 2nd, the near field calibration mode.Antenna system is comprised of service aisle and calibrated channel, and in antenna array except the working cell, also have an alignment unit.At first, measure alignment unit in the antenna array and the S of multiplex operation unit by vector network analyzer
21Then, computer is in align mode by serial ports control antenna system, and the boresight antenna emission of calibrated channel in antenna array be frequency signal a bit, records 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, the signal matrix that front two pacings need to be gone out is poor, obtains systematic error, utilizes the systematic error that obtains to determine the modifying factor of each paths, modifying factor is stored among the FLASH of signal-processing board.System finishes calibration by 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 equally inconsistency between each unit, so the inconsistency of antenna element can affect systematic function equally.
Summary of the invention
The objective of the invention is for above-mentioned the deficiencies in the prior art part, provide a kind of can Effective Raise system output signal-to-noise ratio, the self correcting multipath numeral anti-interference method that can comprehensively calibrate the multi-channel digital anti-interference antenna system.
Above-mentioned purpose of the present invention can reach by following measures: a kind of comprehensive real-time calibration method 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 that mates with the system antenna polarization 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 is by the frequency source of serial ports instruction control transmission 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 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, with this Difference Storage in FLASH11;
(4) computer 5 is in align mode by serial port control signal disposable plates 3, the calibration algorithm that prestores among the FPGA10 is take one the road as benchmark, the signal amplitude that compares other each path channels and reference channel, phase value, each road signal is revised and weighting, make the amplitude of interchannel consistent with phase preserving, the completion system calibration;
(5) computer 5 provides the inertial navigation information of simulation to signal-processing board 3 by serial ports, the anti-interference algorithm that FPGA10 is built-in, then adjust antenna main beam according to the inertial navigation information self-adapting, make it aim at the preset bearing, and the to external world reception of various interference signals of suppressing antenna.
The invention has the beneficial effects as follows:
The present invention combines far field calibration and these two typical calibration stepss of near field 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 at any time as requested system calibration.That the 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 because error change must return antenna system the trouble that error correction is carried out in the laboratory, thereby guarantees the continuity of antenna system work.
Description of drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is self calibration multi-channel digital anti-interference antenna system composition frame chart of the present invention.
Fig. 2 is the hexagon antenna array schematic diagram of the described system of Fig. 1.
Fig. 3 is the schematic diagram that the described system of Fig. 1 receives far-field signal.
Fig. 4 is the workflow diagram of the described system of Fig. 1.
Among the figure: 1 antenna array, 2 channels, 3 signals are processed, 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 comprised 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 of jointly six antenna elements, finishes 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 comprised of the LIULUTONG road, and every paths and a reception antenna unit interconnect by high frequency cable.Transmission channel 9 comprises a frequency source, realizes the generation of calibrating signal, links to each other with transmitting antenna 7 by 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 by six high frequency cables with signal-processing board 3.Power supply and computer are finished power supply and the serial ports control of antenna system by the low frequency socket.
Consult Fig. 2.Antenna array 1 in the self correcting multipath numeral anti-interference antenna system is comprised of seven antennas, and wherein, center cell is transmitting antenna 7, and six unit are reception antenna group 6 on every side.
Consult Fig. 3.In microwave dark room, self calibration multi-channel digital anti-interference antenna system is installed on the turntable, a standard antenna 12 identical with the system antenna polarization is placed perpendicular to the direction of system antenna front in the far field, and standard antenna 12 links to each other with signal source 13.
Consult Fig. 4.Flow chart comprises following part:
Microwave dark room is finished 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) by computer 5 built-in AccessPort software and ISE software, compiled calibration algorithm and digital anti-interference algorithm are downloaded among the FPGA10 of signal-processing board 3;
(3) by the frequency source in the computer 5 transmission serial ports instruction control transmission channels 9, produce a point-frequency signal, transmitting antenna 7 in antenna array 1 sends to reception antenna group 6, through the AD conversion in the filter circuit in the receive path 8, amplifying circuit, frequency converter and the signal processing 3, signal is become digital signal, read each railway digital signal amplitude A among the FPGA by serial ports
1, A
2..., A
nAnd phase place
(4) send the serial ports instructions by computer 5 and close frequency source in the transmission channel 9, place a standard antenna 12 that mates with the system antenna polarization in the far field perpendicular to the direction of antenna array 1 simultaneously, standard antenna 12 is linked to each other with signal source 13, opening signal source 13, after reception antenna group 6 is processed AD conversion in 3 with the far-field signal received through the receive path 8 corresponding filter circuits that link to each other, amplifying circuit, frequency converter and signals, signal is become digital signal, read each railway digital signal amplitude A ' among the FPGA by 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, by AccessPort software with this Difference Storage in FLASH11;
System calibration
(6) send serial ports instruction control channel 2 and signal-processing board 3 by 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 the filter circuit in the receive path 8, amplifying circuit, frequency converter and the signal processing 3, signal is become digital signal, read each railway digital signal amplitude A among the FPGA by 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 compare.
N=2,3 ..., 6; Respectively 2～6 road signals are carried out the width of cloth and compensate mutually, make it consistent with the first via, be i.e. completion system calibration.
System works
(8) computer 5 makes it in running order, and the inertial navigation information of simulation is provided to signal-processing board 3 by 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 to external world reception of various interference signals of suppressing antenna.
Above-mentioned steps 1～5 is finished at microwave dark room, and antenna system only needs a completing steps 6～9 to get final product when practical application.By 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) that mates with the system antenna polarization 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 by the frequency source of serial ports instruction control emission 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), each road signal amplitude and phase place by the output of computer (5) fetch channel, and with step 2 in the data that obtain poor, with this Difference Storage at FLASH(11) in;
4) computer (5) is in align mode by serial port control signal disposable plates (3), when signal-processing board (3) when being in align mode, FPGA(10) can call FLASH(11) storage data, FPGA(10) calibration algorithm that prestores in is take wherein one the road as benchmark, relatively signal amplitude and the phase place of other each path channels and reference channel are revised each road signal, make the amplitude of interchannel consistent with phase preserving, the completion system calibration;
5) computer (5) provides the inertial navigation information of simulation to signal-processing board (3) by serial ports, FPGA(10) built-in anti-interference algorithm, then adjust antenna main beam according to the inertial navigation information self-adapting, make it aim at the preset bearing, and the to external world reception of various interference signals of suppressing antenna.
2. comprehensive real-time calibration method of multi-channel digital anti-interference antenna system as claimed in claim 1, it is characterized in that, described antenna array (1) comprises reception antenna group (6) and transmitting antenna (7), reception antenna group (6) is made of jointly six antenna elements, finishes spacing wave and receives.
3. comprehensive real-time calibration method of multi-channel digital anti-interference antenna system as claimed in claim 1 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 system as claimed in claim 1, it is characterized in that, described channel (2) comprises receive path (8) and transmission channel (9), receive path (8) is comprised of the LIULUTONG road, and every paths and a reception antenna unit interconnect by high frequency cable.
5. comprehensive real-time calibration method of multi-channel digital anti-interference antenna system as claimed in claim 1 is characterized in that, described transmission channel (9) comprises a frequency source, realizes the generation of calibrating signal, links to each other with transmitting antenna (7) by high frequency cable.
6. comprehensive real-time calibration method of multi-channel digital anti-interference antenna system as claimed in claim 1 is characterized in that, six tunnel radiofrequency signals obtain six tunnel intermediate-freuqncy signals through filter circuit, amplifying circuit and frequency converter in the channel (2).
7. comprehensive real-time calibration method of multi-channel digital anti-interference antenna system as claimed in claim 1 is characterized in that, channel (2) interconnects by six high frequency cables with signal-processing board (3).
8. comprehensive real-time calibration method of multi-channel digital anti-interference antenna system as claimed in claim 1 is characterized in that, power supply and computer are finished power supply and the serial ports control of antenna system by the low frequency socket.
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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 | Antenna far field parameter calibration device and calibration method |
| CN103105614B (en) * | 2013-01-17 | 2016-04-20 | 陕西北斗恒通信息科技有限公司 | Based on the Space-time domain associating anti-interference method that inertial navigation is auxiliary |
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| 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 |
| CN118316566B (en) * | 2024-06-11 | 2024-09-03 | 嘉兴诺艾迪通信科技有限公司 | Radio interference system and method for polarization backtracking |
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