CN103884937A - Multi-antenna irradiation test system for airplane HIRF test - Google Patents
Multi-antenna irradiation test system for airplane HIRF test Download PDFInfo
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- CN103884937A CN103884937A CN201410106635.XA CN201410106635A CN103884937A CN 103884937 A CN103884937 A CN 103884937A CN 201410106635 A CN201410106635 A CN 201410106635A CN 103884937 A CN103884937 A CN 103884937A
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Abstract
The invention discloses a multi-antenna irradiation test system for an airplane HIRF test. The multi-antenna irradiation test system comprises a plurality of identical irradiation subsystems. Each irradiation subsystem comprises a signal source, a high power amplifier and a transmitting antenna. The multi-antenna irradiation test system is characterized in that each irradiation subsystem is provided with a numerical control phase shifter which is connected to the output port of the corresponding signal source and the input port of the corresponding high power amplifier in series, and a pseudo random number generator is connected with the phase shifting amount numerical control port of each numerical control phase shifter. The electromagnetic environment imitated through the multi-antenna irradiation test system for the airplane HIRF test is closer to the actual scene of irradiation in all directions, and the requirement for excessively-high capacity of one single power amplifier is also reduced.
Description
Technical field
The present invention relates to be applied to the electromagnetic compatibility test of aircraft, particularly full machine high-strength magnetic irradiation HIRF pilot system.
Background technology
The available commercially available broadband high-power amplifier of electromagnetic susceptibility test at present, general output power is continuous wave 3500W/10kHz～30W/18/40GHz to the maximum, can form 1 meter of distant place the continuous wave field intensity of 200～300V/m by supporting antenna.But aircraft high-strength magnetic irradiation HIRF test need to be from tens meters of outer generations of emitting antenna the electromagnetic environment up to several ten thousand V/m, the high power amplifier of separate unit is helpless.
One intuitively solution to carry out exactly multichannel power synthetic, it is very common and ripe that this technology merges multichannel power in power amplifier inside by circuit, after multi-path power divider amplifies respectively, remerge and can realize with single signal source, as long as guarantee that the electrical length of each shunt equates, thereby be synchronous (same homophase frequently simultaneously) for the input of each emitting antenna.But carrying out power for multi-emitting source at space point has synthesized just so not direct to work as, even if ensure that the input of each emitting antenna is synchronous (simultaneously with frequency homophase), because certain observation point is different and fixing to the space length of each radiation source, the electromagnetic field that each synchrotron radiation source produces at observation point has fixing phase differential, and these phase differential of movement with observation point also change thereupon, so must form in concern space the fixing very inhomogeneous three-dimensional interference pattern of a width, make the stack enhancing mutually all the time of some some formate field intensity of space, some some formate field intensity is cancelled out each other all the time and is weakened, crest and trough are spaced.This is the ultimate principle of common array antenna just, by the relation of control antenna array element outlet chamber amplitude, phase differential, makes array total radiation energy mainly concentrate on desired orientation, realizes energy assignment space distribution.It is undesirable that but this is but the even electromagnetic environment of radiosensitivity RS testing requirements.
Summary of the invention
For the deficiencies in the prior art, goal of the invention of the present invention is to provide a kind of many antennas irradiation test system for aircraft HIRF test, make each radiation source while with frequency but not homophase output, make each point of field intensity of observation point with frequency but phase differential random variation, thereby the formate field intensity random variation of each observation point, assembly average is relatively stable, pays close attention to space and is random evenly electromagnetic environment.
Goal of the invention of the present invention is achieved through the following technical solutions:
A kind of many antennas irradiation test system for aircraft HIRF test, comprise the identical irradiation subsystem of many covers, described irradiation subsystem comprises signal source, high power amplifier, emitting antenna, every suit irradiation subsystem also configures respectively a digital phase shifter and is serially connected in the input port of each signal source output port and high power amplifier, the more digital control port of phase-shift phase that connects each digital phase shifter with a pseudorandom number generator.The electromagnetic field that utilizes pseudorandom number generator that each irradiation antenna is launched is simultaneously same polarization with frequently and phase differential random variation, ensures the homogeneity of the synthetic total electromagnetic field of its stack, avoids forming in irradiation space fixing non-homogeneous interference pattern.
Further, each instrument and equipment is unified manipulation by an industrial computer by data bus.
Another object of the present invention is to provide a kind of many antennas irradiation testing method for aircraft HIRF test, use above-mentioned many antennas irradiation test system, comprise following steps:
1), according to the size of required maximum electromagnetic environment field intensity, aircraft, determine the quantity of irradiation subsystem in many antennas irradiation test system;
2) aircraft being placed in to the area insulating is with it slightly larger than on the ground plane of aircraft vertical projection profile;
3) the azimuth plane of aircraft and above arrange irradiation subsystem;
4) to ambient illumination is frequently same, the electromagnetic wave of phase differential random variation synthesizes the total electromagnetic environment needing to each emitting antenna simultaneously.
As preferably, the layout of irradiation subsystem should meet following principle:
B), azimuth plane antenna will meet the distance d:d>=2D of emitting antenna to aircraft as far as possible
2/ λ or d>=1.5 times aircraft dimension, gets wherein smaller, and wherein D is antenna dimension, and λ is wavelength;
C), must ensure that the polarised direction of each antenna is consistent, the especially attitude of the upper antenna of attention;
D), each antenna direction be set mutually stagger, main lobe can not directly be aimed at mutually.
As preferably, between irradiation subsystem and aircraft, be equipped with one-way isolator, protection transmitting components and parts.
Compared with prior art, beneficial effect of the present invention is: the more approaching actual scene from each orientation irradiation of the more conventional single antenna method of electromagnetic environment that the present invention generates, reduce again the too high requirement of separate unit power amplifier capacity simultaneously, do not have advantage although build in test facilities expense, feasibility strengthens greatly.Experiment process is simple simultaneously, and strong operability has good practical directiveness, can significantly improve work efficiency, the reduction expense of in engineering, carrying out this type of assessment.Contribute to the aircraft-level seaworthiness of the civil aircraft of China's implementation at the startup to get, the carrying out of certification work.
Brief description of the drawings
Fig. 1 is the system chart of a kind of many antennas irradiation test system for aircraft HIRF test of the present invention.
Fig. 2 is many antenna arrangement of flivver figure (overlooking) in the embodiment of the present invention.
Fig. 3 is large many antenna arrangement of aircraft figure (overlooking) in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of many antennas irradiation test system for aircraft HIRF test of the present invention comprises the identical irradiation subsystem of many covers (more than general 4 covers), every suit irradiation subsystem contact successively signal source, digital phase shifter, high power amplifier, emitting antenna, connect again the port of each digital phase shifter with a pseudorandom number generator, the electromagnetic field that utilizes pseudorandom number generator that each irradiation antenna is launched is simultaneously same polarization with frequently and phase differential random variation, ensure the homogeneity of the synthetic total electromagnetic field of its stack, avoid forming in irradiation space fixing non-homogeneous interference pattern.All appts equipment is unified manipulation by an industrial computer by data bus.System composition connects block diagram and sees accompanying drawing 1.
In EMC radiosensitivity RS test, high level field intensity HIRF test, requirement frequency sweeping speed will be slowly to being subject to test specimen to have enough time to make response, every frequency residence time of general step-scan was more than or equal to for 1 second, and LINEAR CONTINUOUS sweep speed with it quite or slower.This second level rate of change is not difficult to realize for digital phase shifter.
When use, 1) according to the size of required maximum electromagnetic environment field intensity, aircraft, determine the quantity of irradiation subsystem.Can produce 300V/m@continuous wave, 3000V/m@pulsating wave PW=1 μ s/PRF=1kHz electrometer of field strength by single cover radiation subsystem, as used on large aircraft, select eight cover radiation subsystems, synthetic total intensity is expected to reach 2400V/m@continuous wave, 24000V/m@pulsating wave PW=1 μ s/PRF=1kHz.This has met the requirement of current seaworthiness or GJB1389A.
2) aircraft being placed in to the area insulating is with it slightly larger than on the ground plane of aircraft vertical projection profile.The reflection of the electromagnetic wave of transmitting irradiation antenna transmission on ground plane, makes the synthetic electromagnetic field in ventral place stronger, and this is consistent with the situation that the electromagnetic interference (EMI) meeting with in-flight comes from surface facility more;
3) arrange each irradiation subsystem according to aircraft size;
For flivver, at it, all around each layout is a set of, antenna beamwidth >=90 °, and height is identical with aircraft horizontal axis.Directly over arrange a set of omnidirectional antenna, the 10 meters of downward irradiation in slave top top (seeing accompanying drawing 2).
Arrange 36 °～60 ° of 6～10 covers, antenna beamwidths for large aircraft at its azimuth plane, height is identical with aircraft horizontal axis.2 covers, antenna beamwidth >=180 °, respectively 10 meters of downward irradiation (seeing accompanying drawing 3) from top are arranged in left and right sides top.
4) to ambient illumination is frequently same, the electromagnetic wave of phase differential random variation synthesizes the total electromagnetic environment needing to each antenna simultaneously, then by general RS test routine enforcement HIRF test.
Should be noted that item:
1) radiating antenna should meet far field condition (D is antenna dimension, and λ is wavelength) to the distance d of aircraft
d≥2D
2/λ
Or d >=1.5 times aircraft dimension, get wherein smaller
Azimuth plane antenna will meet this condition as far as possible, can suitably shift near unless field intensity amplitude does not reach; Top antenna is considered the feasible and convenience of testing ground, is just directly defined as 10 meters.
2) must ensure that the polarised direction of each antenna is consistent, especially note the attitude of upper antenna.
3) must be noted that " the reciprocity effect " of antenna, prevent that emittance from pouring in down a chimney damage power amplifier, even if power amplifier has total reflection defencive function.Each antenna direction should be set as far as possible and mutually stagger, main lobe necessarily can not directly be aimed at mutually.Transmission channel is equipped with enough one-way isolators of large similar circulator of isolation simultaneously, protection transmitting components and parts.
Claims (5)
1. the many antennas irradiation test system for aircraft HIRF test, comprise the identical irradiation subsystem of many covers, described irradiation subsystem comprises signal source, high power amplifier, emitting antenna, it is characterized in that every suit irradiation subsystem also configures respectively a digital phase shifter and is serially connected in the input port of each signal source output port and high power amplifier, the more digital control port of phase-shift phase that connects each digital phase shifter with a pseudorandom number generator.
2. many antennas of one irradiation test system according to claim 1, it is characterized in that each instrument and equipment by an industrial computer by data bus unify manipulation.
3. for many antennas irradiation testing method of aircraft HIRF test, right to use requires the arbitrary many antennas irradiation test system described in 1-2, it is characterized in that comprising following steps:
1), according to the size of required maximum electromagnetic environment field intensity, aircraft, determine the quantity of irradiation subsystem in many antennas irradiation test system;
2) aircraft being placed in to the area insulating is with it slightly larger than on the ground plane of aircraft vertical projection profile;
3) the azimuth plane of aircraft and above arrange irradiation subsystem;
4) to ambient illumination is frequently same, the electromagnetic wave of phase differential random variation synthesizes the total electromagnetic environment needing to each emitting antenna simultaneously.
4. many antennas irradiation testing method according to claim 3, is characterized in that the layout of irradiation subsystem should meet following principle:
A), azimuth plane antenna will meet the distance d:d>=2D of emitting antenna to aircraft as far as possible
2/ λ or d>=1.5 times aircraft dimension, gets wherein smaller, and wherein D is antenna dimension, and λ is wavelength;
B), ensure that the polarised direction of each antenna is consistent;
C), each antenna direction be set mutually stagger, main lobe can not directly be aimed at mutually.
5. many antennas irradiation testing method according to claim 3, is characterized in that being equipped with one-way isolator between irradiation subsystem and aircraft, protection transmitting components and parts.
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| CN201410106635.XA CN103884937B (en) | 2014-03-21 | 2014-03-21 | A kind of multiple antennas irradiation test system for aircraft HIRF test and application thereof |
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| CN201410106635.XA CN103884937B (en) | 2014-03-21 | 2014-03-21 | A kind of multiple antennas irradiation test system for aircraft HIRF test and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104375045A (en) * | 2014-11-27 | 2015-02-25 | 上海无线电设备研究所 | Method for eliminating multi-path reflection interference error in HIRF test |
| CN112114218A (en) * | 2020-09-22 | 2020-12-22 | 上海无线电设备研究所 | High-level test system for HIRF test and verification method |
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| WO2010119744A1 (en) * | 2009-04-16 | 2010-10-21 | 日本電気株式会社 | Antenna device and multi-antenna system |
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| JP2005241421A (en) * | 2004-02-26 | 2005-09-08 | Maspro Denkoh Corp | Interference excluding capability testing apparatus |
| US7218123B1 (en) * | 2006-02-13 | 2007-05-15 | Rockwell Collins, Inc. | Centralized HIRF detection system |
| WO2010119744A1 (en) * | 2009-04-16 | 2010-10-21 | 日本電気株式会社 | Antenna device and multi-antenna system |
| CN103033708A (en) * | 2012-12-13 | 2013-04-10 | 中国航空无线电电子研究所 | Plane whole-machine high-strength illumination testing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375045A (en) * | 2014-11-27 | 2015-02-25 | 上海无线电设备研究所 | Method for eliminating multi-path reflection interference error in HIRF test |
| CN104375045B (en) * | 2014-11-27 | 2017-03-29 | 上海无线电设备研究所 | The removing method of ground Multipath reflection mushing error in a kind of HIRF tests |
| CN112114218A (en) * | 2020-09-22 | 2020-12-22 | 上海无线电设备研究所 | High-level test system for HIRF test and verification method |
| CN112114218B (en) * | 2020-09-22 | 2024-02-23 | 上海无线电设备研究所 | High-level test system for HIRF test and verification method |
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