CN106872831A - Interference source determines method in highly sensitive antenna of receiving device band in microwave load satellite - Google Patents
Interference source determines method in highly sensitive antenna of receiving device band in microwave load satellite Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
Determine method disclosed herein is interference source in highly sensitive antenna of receiving device band in microwave load satellite, first, whole microwave load satellite is placed in standard shielded dark room conditions；Then, it is determined that the potential interference pair with highly sensitive antenna of receiving device as recipient；Then, the interference margins of each potential electromagnetic interference pair are calculated, interference margins is defined as potential interference source more than the interference source of the potential electromagnetic interference pair of pre-determined threshold；Afterwards, first highly sensitive receiving device is powered up, potential interference source is loaded successively according still further to interference margins order from small to large, when highly sensitive receiving device working state abnormal after having loaded potential interference source, determines that the potential interference source is interference source in highly sensitive antenna of receiving device band.The method of testing is realized and directly orient interference source, interference operating mode and interference strength, demonstrates electromagnetic interference problem in satellite system, reaches the purpose for directly improving system EMC test efficiency.
Description
Technical field
The present invention relates to a kind of pilot project and method in a kind of whole star EMC test, particularly microwave load is defended
Interference source determines method in highly sensitive antenna of receiving device band in star, belongs to technical field of electromagnetic compatibility.
Background technology
Modern marine dynamic environment satellite and high resolution SAR load satellite are microwave remote sensing satellite, such satellite master
It is to obtain earth surface feature, including Ocean Wind-field, wave, ocean current, SST, storm at sea using microwave load to want task
With tide etc., Ocean monitoring, disaster monitoring and assessment, land mapping and urban development planning, agricultural, forestry, geology,
The aspect extensive application prospect such as hydrology, generally loads many more highly sensitive to obtain high-precision remotely-sensed data, on star
Microwave loading device, except needing emphasis to consider the guarantor to these high sensitivity loading devices in design of satellites development process
Shield, in addition it is also necessary to design reasonable effective pilot project for the system-level EMC test in satellite assembly electrical measurement stage to test
In card satellite system from compatible context, because satellite system Development Schedule is compact, system EMC test is related to point is
System equipment is numerous, designs a kind of method of testing for being capable of the quickly position in location interference source and operating mode, raising test efficiency and examination
Effect is tested, whole star Development Schedule can be effectively ensured, improve system reliability.
In actual conditions, the general assembly stage is developed in satellite, it will usually arrange whole star EMC test to carry out verifying satellites each
Electro Magnetic Compatibility and safe clearance between subsystem.And in traditional whole star EMC test, often by the electrical measurement journey of satellite
Sequence is arranged to the in-orbit mould of satellite and flies working condition, then monitor each subsystem and equipment normal work whether, so as to verify and be
System Internal electromagnetic compatibility.In this case, once finding disturbed phenomenon, research institute needs to expend a large amount of human and material resources
To organize malfunction elimination to work, and on star, relation is complicated between subsystem, interknit, and more extends the electrical measurement time of satellite system
To find interference source, whole star Development Schedule is will inevitably impact on.Especially for the microwave for having multiple highly sensitive receptions on star
Load satellite, and loaded on microwave remote sensing satellite radio-frequency apparatus sensitivity is high and Numerous, easily sent out between different subsystems
Raw electromagnetic interference, more deepens the difficulty of interference source positioning, if without target is investigated with having a definite purpose, efficiency is lower.
The content of the invention
Technology solve problem of the invention is：Overcome the deficiencies in the prior art, propose a kind of microwave load satellite Nei Gaoling
Interference source determines method in quick antenna of receiving device band, quick and precisely orients position, interference operating mode and the interference of interference source
Degree, so as to solve electromagnetic interference problem in satellite system, reaches the purpose for directly improving system EMC test efficiency.
Technical solution of the invention is：Interference source determines in highly sensitive antenna of receiving device band in microwave load satellite
Method, the highly sensitive receiving device is the receiving device better than -100dBm for receiving sensitivity, and the method includes following step
Suddenly：
(1), whole microwave load satellite is placed in standard shielded dark room conditions, by standard shielded darkroom ground and microwave
Absorbing material is paved with load satellite support, it is to avoid after interference signal reflects through object in microwave load satellite health surrounding environment
Into sensitive receiver device antenna；
(2) potential interference pair with highly sensitive antenna of receiving device as recipient in microwave load satellite, is determined；
(3), the interference margins of each potential electromagnetic interference pair determined by calculation procedure (2), interference margins are more than
The interference source of the potential electromagnetic interference pair of pre-determined threshold is defined as potential interference source, into step (4)；
(4), according to realistic application conditions on microwave load Satellite, highly sensitive receiving device and its corresponding day are connected
Line, and powered up, it is allowed in running order；
(5), the order according to interference margins from small to large loads potential interference source successively, and monitors loading potential interference source
The working condition of highly sensitive receiving device afterwards；When highly sensitive receiving device working state abnormal, it is believed that newest power-up
Potential interference source is interfered to highly sensitive receiving device, records the interference source and interference phenomenon, and the interference source is closed afterwards again
The new potential interference source of loading, otherwise, then need not close the interference source, new potential interference source is loaded directly into, until step (3)
In identified all potential interference sources loaded, determine interference source in highly sensitive antenna of receiving device band.
The step (4) using the antenna of identical gain, identical sensing while be also disposed adjacent to highly sensitive receiver antenna
Position, the antenna is connected to the rf inputs of electromagnetic interference monitoring device, in highly sensitive receiver antenna band
Frequency spectrum is monitored；The step (5) is while monitor the highly sensitive receiver antenna band that the test of electromagnetic interference monitoring device is obtained
Interior frequency spectrum, observes noise level, and recording noise level exceedes the value of the receiving sensitivity of highly sensitive receiver, while obtaining height
Interference strength of the interference source to highly sensitive receiving device in sensitive receiver device antenna band.
The step (4) is placed in the position of highly sensitive antenna of receiving device using the antenna of identical gain, identical sensing, replaces
Highly sensitive receiving device is changed, the antenna is connected to the rf inputs of electromagnetic interference monitoring device, and frequency spectrum in aerial band is made an uproar
Vocal level is monitored；
Order loading potential interference source of the step (5) according to interference margins from small to large, and monitor electromagnetic interference prison
Frequency spectrum in the highly sensitive antenna of receiving device band that measurement equipment test is obtained, observes noise level, when noise level is more than highly sensitive
During receiving device sensitivity, it is believed that the potential interference source of power-up interferes to highly sensitive receiving device recently, records the interference
Source, closes the interference source afterwards, loads new potential interference source, otherwise, then need not close the interference source, is loaded directly into new diving
In interference source, until identified all interference sources have been loaded in step (3), determine to be done in highly sensitive antenna of receiving device band
Disturb source.
The standard shielded darkroom is directed to the signal of 1~18GHz of frequency range, and shield effectiveness should at least reach：80dB,
The signal of 1~1000MHz of frequency range is directed to simultaneously, and shield effectiveness should at least reach：90dB.
The potential interference to constitute two equipment of transmitting-receiving of interference, highly sensitive receiving device as receiving device, when
The transmission signal fundamental wave of transmitting equipment, harmonic wave, subharmonic, clutter are fallen into the main passband and mirror image passband of highly sensitive receiving device
When, then the transmitting equipment constitutes potential interference pair with highly sensitive receiving device.
The potential electromagnetic interference between two equipment comprising two types disturb, coupled interference and shell respectively between antenna
Body leakage interference, step (3) calculates the interference margins that potential interference is disturbed two types, takes both maximums as electricity respectively
The interference margins of magnetic disturbance pair.
The interference margins IM of coupling type interference is calculated using following equation between the antenna：
IM=P (fE)-LCE1-Lt-Ltr-Lr-PR(fR)
In formula,
P(fE) be transmitting equipment transmission signal center frequency point fECorresponding power；
LCE1It is to launch power of the equipment transmission signal at receiving device center frequency point relative to transmission signal center frequency point
Locate the attenuation of power, unit dB.
LtFor transmitting equipment and transmitting antenna between at receiving device center frequency point corresponding feeder loss, unit dB；
LtrIt is the isolation between receiving and transmitting, unit dB；
LrFor between receiving device and antenna of receiving device at receiving device center frequency point corresponding feeder loss unit
dB；
PR(fR) be response frequency be fRWhen, receiving device susceptibility threshold, unit dBm, fRIt is the center of receiving device
Frequency.
The interference margins IM of the housing leak type interference is calculated using following equation：
IM=E1-20log(R)+20log(λ)+20log(GR)-127-Ispace-PR(fR)
In formula, E1For the unintended radiation of the transmitting equipment of potential interference centering launches field intensity, unit dBuV/m；
R for potential interference centering transmitting equipment apart between the receiving device sensitive reception antenna of potential interference centering away from
From unit m；
λ receives the corresponding signal wavelength of working frequency, unit m for the receiving device of potential interference centering；
GRIt is the gain of the receiving device reception antenna of potential interference centering, unit dB；
IspaceIt is the degree of screening that satellite structure between jamming equipment and antenna causes, unit dB；
PR(fR) be response frequency be fRWhen receiving device susceptibility threshold, unit dBm；
fRIt is the centre frequency of receiving device.
The microwave absorbing property of the absorbing material is not less than 30dB.
The default thresholding is -3dB~0dB.
Compared with the prior art, the invention has the advantages that：
(1), the present invention is by satellite RF EMC analysis, confirming potential interference pair in system in advance, then from
The result of calculation of the electromagnetic interference surplus of potential interference pair is realized to the pre- of interference operating mode, annoyance level and potential interference path
Survey, the very first time quick locating interfering devices and operating mode that can occur in failure confirm, are conducive to formulating electromagnetic compatibility in time
Measures to rectify and reform；
(2), the present invention uses ground-plane antenna and the highly sensitive antenna of receiving device band of electromagnetic interference monitoring device Simultaneous Monitoring
Interior frequency spectrum is changed as supplementary means by the noise in Real Time Observation sensitive reception band, quickly determines annoyance level；
(3), the present invention directly replaces highly sensitive receiving device, Ke Yiti using ground-plane antenna and electromagnetic interference monitoring device
The influence that the preceding whole star miscellaneous equipment of prediction is produced to it；The EMC of other equipment so can be effectively instructed to design and control work
Make, it is to avoid miss the opportunity of design modification.
(4), selection standard shielded anechoic chamber of the present invention is tested, and carries out place transformation to darkroom, the field around satellite
High-performance wave-absorbing material is completely spread on the support of ground and satellite, to reduce test error that multi-path jamming brings to test system
Influence, improves test accuracy.
(5), the present invention is entered using ground-plane antenna and electromagnetic interference monitoring device to the disturbed state of highly sensitive receiving device
Row monitoring, it is to avoid remotely-sensed data interpretation time delay brings investigation not in time.
Brief description of the drawings
Fig. 1 is that interference source determines method flow diagram in highly sensitive antenna of receiving device band in microwave load satellite of the present invention；
Fig. 2 is the highly sensitive reception antenna in-band noise test arrangement schematic diagram of the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
Microwave load inside includes multiple satellite borne equipments, including the navigation of measuring and controlling equipment, data transmission equipment and high sensitivity is received
Machine etc., what is had possesses emission function, and what is had possesses receive capabilities.Wherein, highly sensitive receiving device is especially sensitive, is highly prone to hair
The interference of jet device, particularly receiving sensitivity are receiving device (the such as high sensitivity navigation neceiver better than -100dBm
Sensitivity index reaches -130dBm).Therefore need to be analyzed the antenna in-band noise of these equipment and test to determine its band
Interior interference source, so as to preferably protect these equipment not receive external interference.
As shown in figure 1, the invention provides interference source in highly sensitive antenna of receiving device band in a kind of microwave load satellite
Determine method, the method comprises the following steps：
(1), whole microwave load satellite is placed in standard shielded dark room conditions, by standard shielded darkroom and microwave load
Absorbing material is paved with satellite support, it is to avoid interference signal enters after being reflected through object in microwave load satellite health surrounding environment
Sensitive receiver device antenna；The standard shielded darkroom is directed to the signal of 1~18GHz of frequency range, and shield effectiveness at least should
Reach：80dB；The signal of 1~1000MHz of frequency range is directed to simultaneously, and shield effectiveness should at least reach：90dB.
If standard shielded darkroom is half wave shield darkroom, at least to expire on the ground in the range of satellite 4m
Paving absorbing material, completely spreads absorbing material on the support of satellite, and the microwave absorbing property of the absorbing material is not less than 30dB；
(2) potential interference pair with highly sensitive antenna of receiving device as recipient in microwave load satellite, is determined；It is described latent
In interference to constitute two equipment of transmitting-receiving of interference, highly sensitive receiving device as receiving device, when the transmitting for launching equipment
Signal fundamental wave, harmonic wave, subharmonic, clutter are fallen into when in the main passband and mirror image passband of highly sensitive receiving device, then the transmitting sets
It is standby to constitute potential interference pair with highly sensitive receiving device.
(3), the interference margins of each potential electromagnetic interference pair determined by calculation procedure (2), interference margins are more than
The interference source of the potential electromagnetic interference pair of pre-determined threshold is defined as potential interference source, possible certain equipment of the interference source, it is also possible to
It is the one of which mode of operation of certain equipment, can be listed in the list of potential interference source, is the positioning conduct of later stage interference source
Foundation, into step (4)；
The pre-determined threshold span 0dB, it is contemplated that the test data that calculating interference margins are used has test error,
And the purpose of Space Vehicle System EMC experiments is fully to expose potential problem, in order to fully expose problem, in practical application
In, relatively low threshold value is generally taken, such as -3dB.
The potential electromagnetic interference between two equipment comprising two types disturb, coupled interference and shell respectively between antenna
Body leakage interference.Wherein：
(3.1), the interference margins IM of coupling type interference is calculated using following equation between antenna：
IM=P (fE)-LCE1-Lt-Ltr-Lr-PR(fR)
In formula：
P(fE) be transmitting equipment transmission signal center frequency point fECorresponding power；Belong to stand-alone device design objective it
One, can use test value or design load.
LCE1It is to launch power of the equipment transmission signal at receiving device center frequency point relative to transmission signal center frequency point
Locate the attenuation of power, unit：dB.Can be using the survey for whether meeting CE106 requirements in national military standard GJB151A on emitter
Method for testing test is obtained.The CE106 refers to that " military equipment and subsystem Electromagnetic Launching and susceptibility will in standard GJB151A
Ask " under " prevention at radio-frequency port conducted emission " test event, it provide emitter prevention at radio-frequency port the outer clutter recognition situation of band, can
To obtain pad value of the emission spectra with respect to primary spectrum.
LtFor transmitting equipment and transmitting antenna between at receiving device center frequency point corresponding feeder loss, unit：dB；
Belong to one of design objective of stand-alone device, can use test value or design load.
LtrIt is the isolation between receiving and transmitting, unit dB can be obtained, using vector network analyzer test because surveying
Ground reflections affect in examination hall should take into full account that its test error is corrected, and degree of coupling worst case should be used when interference margins are analyzed,
Simulation result also can be used in the case of not having measured result.
LrFor between receiving device and antenna of receiving device at receiving device center frequency point corresponding feeder loss unit：
DB, belongs to one of design objective of stand-alone device, can use test value or design load.
PR(fR) be response frequency be fRWhen, receiving device susceptibility threshold, unit：DBm, is obtained by test；
fRIt is the centre frequency of receiving device.
(3.2), the interference margins IM of housing leak type interference is calculated using following equation：
IM=E1-20log(R)+20log(λ)+20log(GR)-127-Ispace-PR(fR)
In formula：
E1For the unintended radiation of the transmitting equipment of potential interference centering launches field intensity, unit：dBuV/m；Army of state can be used
Whether the method for testing for meeting RE102 requirements on emitter in mark GJB151A is obtained.The RE102 refers in standard
" electric field radiation transmitting " test event under GJB151A " military equipment and subsystem Electromagnetic Launching and susceptibility requirement ", it is carried
For apparatus casing and the radiation-emitting of interconnecting cable, can be received the valuation of antenna front ends electric-field intensity, can obtain away from
Space electrical field at 1 meter from equipment.
R for potential interference centering transmitting equipment apart between the receiving device sensitive reception antenna of potential interference centering away from
From unit：m.
λ receives signal wavelength for the receiving device of potential interference centering, and unit m is received using the light velocity divided by receiving device
The working frequency of signal is calculated.
GRIt is the gain of the receiving device reception antenna of potential interference centering, unit dB, the design for belonging to stand-alone device refers to
One of mark, can use test value or design load.
IspaceIt is the degree of screening that satellite structure between jamming equipment and antenna causes, unit dB belongs to setting for stand-alone device
One of meter index, can use test value or design load.
PR(fR) be response frequency be fRWhen receiving device susceptibility threshold, unit dBm, by unit performance test
Obtain.
fRIt is the centre frequency of receiving device.
The interference margins of potential electromagnetic interference pair take the maximum of the interference margins of above two types of interference.
(4), according to realistic application conditions on microwave load Satellite, highly sensitive receiving device and its corresponding day are connected
Line, and powered up, it is allowed in running order；Sensitive reception equipment mounting arrangement high, antenna arrangement, the line being detected on star
Cable type selecting, cable trend etc. should be consistent with actual state on star.
(5), the order according to interference margins from small to large loads potential interference source, and the remote measurement ginseng for passing through satellite successively
Number, remotely-sensed data and ground monitoring equipment, the working condition of highly sensitive receiving device after monitoring loading potential interference source；Work as height
When sensitive receiver equipment working state is abnormal, such as there is abnormal telemetering state, remotely-sensed data exception or ground monitoring equipment
During abnormal parameters, it is believed that the potential interference source of newest power-up interferes to highly sensitive receiving device, records the interference source, that is, remember
Detailed jamming pattern and scalar value are recorded, the interference source is closed afterwards and is reloaded new potential interference source, otherwise, then without closing
The interference source, is loaded directly into new potential interference source, until identified all potential interference sources have loaded in step (3),
Determine interference source in highly sensitive antenna of receiving device band.
In order to further obtain to interference journey of the interference source to highly sensitive receiving device in highly sensitive antenna of receiving device band
Degree, the step (4) using the antenna of identical gain, identical sensing while be also disposed adjacent to the position of highly sensitive receiver antenna
Put, the antenna is connected to the rf inputs of electromagnetic interference monitoring device (such as spectrum analyzer), for highly sensitive reception
Frequency spectrum is monitored in machine aerial band；The step (6) is while that monitors that the test of electromagnetic interference monitoring device obtains highly sensitive connects
Frequency spectrum in receipts machine aerial band, observes noise level, and recording noise level exceedes the value of the receiving sensitivity of highly sensitive receiver,
Obtain to annoyance level of the interference source to highly sensitive receiving device in highly sensitive antenna of receiving device band simultaneously.Electromagnetic interference is supervised
The center frequency point of measurement equipment is set to the center frequency point that the highly sensitive equipment receives band, the reception bandwidth of electromagnetic interference monitoring device
1.5 times of the sensitive equipment reception bandwidth are set to, this ground-plane antenna adds surface em to disturb the test of (EMI) monitoring device
The method of noise spectrum can be supplemented as auxiliary.
When high sensitivity receiving device and antenna in step (2) cannot participate in system test because of cause specific, can be with
Using following method look-aheads and orient the possible disturbed degree of operating mode and highly sensitive receiving device of potential interference equipment,
Be conducive to determining that measures to rectify and reform eliminate or improve interference phenomenon rapidly：
The step (4) is disposed adjacent to the position of highly sensitive antenna of receiving device using the antenna of identical gain, identical sensing
Put, replace highly sensitive receiving device, the antenna is connected to the rf inputs of electromagnetic interference monitoring device, to frequency in aerial band
Spectrum is monitored；
Order loading potential interference source of the step (5) according to interference margins from small to large, and monitor electromagnetic interference monitoring and set
Frequency spectrum in the highly sensitive antenna of receiving device band that standby test is obtained, observes noise level, when noise level exceedes highly sensitive reception
During device sensitivity, it is believed that recently power-up potential interference source highly sensitive receiving device is interfered, record the interference source and
Interference phenomenon, that is, record detailed jamming pattern and scalar value, and the interference source is closed afterwards, loads new potential interference source, no
Then, then the interference source need not be closed, new potential interference source is loaded directly into, until identified all interference source in step (3)
Load, determined interference source in highly sensitive antenna of receiving device band.Equally, the center frequency point of electromagnetic interference monitoring device is set
The center frequency point of band is received for the highly sensitive equipment, the reception bandwidth of electromagnetic interference monitoring device is set to sensitive equipment reception
1.5 times of bandwidth.
Fig. 2 gives highly sensitive antenna of receiving device in-band noise test arrangement schematic diagram.The figure as one embodiment,
Assuming that measuring and controlling equipment constitutes a pair of potential interferences pair, data transmission equipment as first potential interference source and high sensitivity receiving device
Constituted as second potential interference source and high sensitivity receiving device another to potential interference pair.During test, first according to satellite
Practical application connects highly sensitive payload reception equipment and its antenna, loads highly sensitive receiving device and is disposed at sensitive receiver
Working condition, loading potential interference source 1, is respectively provided with the various mode of operations and operating mode of interference source 1, observes sensitive payload reception
Whether equipment working state is normal, at the same time using the ground-plane antenna (containing cable) of EMC, low-noise amplifier and electromagnetic interference
Receiving device records the noise spectrum level that sensitive payload reception antenna is received in band simultaneously, also may be used when such as having more than sensitivity limit
Confirm that interference phenomenon is present, also need to record detailed jamming pattern and scalar value.When system testing does not have connecing for highly sensitive load
When receipts machine and antenna, EMC ground-plane antennas are placed near highly sensitive loaded antennas.
After all suspicious interference source loadeds, to interference source positioning, interference channel in highly sensitive antenna of receiving device band
And annoyance level verification experimental verification has been finished, totally rectification scheme quickly can be determined according to the result.
Electromagnetic compatibility test result, antenna of the present invention according to other equipment on the satellite being collected into satellite development process
Layout and isolation between antennas test result and the compatible analysis of completion system level radio-frequency electromagnetic, and be given according to RE102 and CE106
Measured result carries out interference margins analytical calculation formula, so favourable when interference margins list the list of potential interference source in more than 0
Corresponding operating mode when noise testing in aerial band is obtained, so interference when occurring can with the very first time quick locating interfering devices and
Operating mode confirms, is conducive to formulating electromagnetic compatibility measures to rectify and reform in time.
Participated in The present invention gives having, without actual highly sensitive receiving device in the case of two kinds of system testing highly sensitive connects
The sensitive loaded antennas in-band noise method of testing selection of receiving unit, antenna laying method and its electromagnetic interference monitoring device are set,
Especially in the case where test is participated in without highly sensitive receiving device, monitoring sensitivity is implemented by ground-plane antenna and receiving device and is connect
The change of antenna in-band noise is received, the influence that may can be produced to it with the whole star miscellaneous equipment of look-ahead so can be effective
Instruct other equipment EMC design and control work, it is to avoid miss device level EMC Design modification opportunity.
Embodiment：
3 subharmonic of the TT＆C Transponder tranmitting frequency 2.228GHz of certain microwave remote sensing satellite fall into certain highly sensitive load
In the 350MHz frequency bands of the 6.6G receiving channels of receiver (microwave radiometer).
If 1) interference channel is coupled to reception antenna, the transmitting path of TT＆C Transponder by transmitting antenna direct radiation
Transmission power 26dBm, path attenuation 3dB, the subharmonic of answering machine emission port CE106 host tests result 3 are suppressed to 43dB, standby
The subharmonic of test result 3 of machine suppresses to be better than 58dB, and the sensitivity of payload reception machine is better than between -118dBm, two subsystem antennas
Isolation is 87dB by RM stars test result, and so by above formula, interference margins are expected to be 11dB (main frame) after calculating
There is interference, -4dB (standby host) is noiseless.
If 2) interference channel is coupled to reception antenna by TT＆C Transponder housing leakage rediation, according to unit RE102
Test result knows that the radiation-emitting that triple-frequency harmonics 6.685GHz interference is leaked from circuit is 47.5dBuV/m TT＆C Transponder distances
6.6G reception antennas are more than 2 meters, and the degree of screening according to conventional this frequency range celestial body of test experience can reach more than 40dB, so pass through
Above formula, interference margins are expected that -34.5dB is noiseless after calculating.
It is overall that the interference margins of system potential interference pair are analyzed according to this method in advance, in positive sample electromagnetic compatibility system
Just it is scheduled that this is tested first during unified test examination curriculum, is just verified in the first initial time of system electromagnetic compatibility test
Interference problem of the answering machine (main frame) and microwave radiometer between, and confirm that interference channel is coupled between coming from antenna, root
Low pass filter (its is increased according to the quick main transmission channel in answering machine of disturbed degree (disturbed degree about 20dB) of receiver
Filtering characteristic is more than 28dB at 6.685GHz frequencies) such that system safe clearance is more than 6dB.It can be seen that, proposed using the present invention
Method, can the quickly position in location interference source and operating mode, so as to improve test efficiency and clear and definite measures to rectify and reform, be effectively ensured
Whole star Development Schedule, improves system reliability.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (10)
1. interference source determines method in highly sensitive antenna of receiving device band in microwave load satellite, and the highly sensitive receiving device is
Receiving sensitivity is the receiving device better than -100dBm, it is characterised in that comprised the following steps：
(1), whole microwave load satellite is placed in standard shielded dark room conditions, by standard shielded darkroom ground and microwave load
Absorbing material is paved with satellite support, it is to avoid interference signal enters after being reflected through object in microwave load satellite health surrounding environment
Sensitive receiver device antenna；
(2) potential interference pair with highly sensitive antenna of receiving device as recipient in microwave load satellite, is determined；
(3), the interference margins of each potential electromagnetic interference pair determined by calculation procedure (2), by interference margins more than default
The interference source of the potential electromagnetic interference pair of thresholding is defined as potential interference source, into step (4)；
(4), according to realistic application conditions on microwave load Satellite, highly sensitive receiving device and its corresponding antenna are connected, and
Powered up, be allowed in running order；
(5), the order according to interference margins from small to large loads potential interference source successively, and after monitoring loading potential interference source
The working condition of highly sensitive receiving device；When highly sensitive receiving device working state abnormal, it is believed that newest power-up it is potential
Interference source is interfered to highly sensitive receiving device, records the interference source and interference phenomenon, the interference source is closed afterwards and is reloaded
New potential interference source, otherwise, then need not close the interference source, be loaded directly into new potential interference source, until institute in step (3)
The all potential interference sources for determining have loaded, and determine interference source in highly sensitive antenna of receiving device band.
2. determination method is disturbed in microwave load satellite according to claim 1 in highly sensitive antenna of receiving device band, its
It is characterised by：The step (4) using the antenna of identical gain, identical sensing while be also disposed adjacent to highly sensitive receiver antenna
Position, the antenna is connected to the rf inputs of electromagnetic interference monitoring device, in highly sensitive receiver antenna band
Frequency spectrum is monitored；The step (5) is while monitor the highly sensitive receiver antenna band that the test of electromagnetic interference monitoring device is obtained
Interior frequency spectrum, observes noise level, and recording noise level exceedes the value of the receiving sensitivity of highly sensitive receiver, while obtaining height
Interference strength of the interference source to highly sensitive receiving device in sensitive receiver device antenna band.
3. determination method is disturbed in microwave load satellite according to claim 1 in highly sensitive antenna of receiving device band, its
It is characterised by：
The step (4) is placed in the position of highly sensitive antenna of receiving device using the antenna of identical gain, identical sensing, replaces high
Sensitive receiver equipment, the antenna is connected to the rf inputs of electromagnetic interference monitoring device, to pectrum noise electricity in aerial band
It is flat to be monitored；
Order loading potential interference source of the step (5) according to interference margins from small to large, and monitor electromagnetic interference monitoring and set
Frequency spectrum in the highly sensitive antenna of receiving device band that standby test is obtained, observes noise level, when noise level exceedes highly sensitive reception
During device sensitivity, it is believed that the potential interference source of power-up interferes to highly sensitive receiving device recently, records the interference source, it
After close the interference source, load new potential interference source, otherwise, then need not close the interference source, be loaded directly into new potential dry
Source is disturbed, until identified all interference sources have been loaded in step (3), interference in highly sensitive antenna of receiving device band is determined
Source.
4. disturb true in the microwave load satellite according to any one of claim 1 or 3 in highly sensitive antenna of receiving device band
Determine method, it is characterised in that：The standard shielded darkroom is directed to the signal of 1~18GHz of frequency range, and shield effectiveness at least should
Reach：80dB, while the signal of 1~1000MHz for frequency range, shield effectiveness should at least reach：90dB.
5. disturb true in the microwave load satellite according to any one of claim 1 or 3 in highly sensitive antenna of receiving device band
Determine method, it is characterised in that：The potential interference is to constitute two equipment of transmitting-receiving of interference, highly sensitive receiving device is used as connecing
Receiving unit, when the transmitting transmission signal fundamental wave of equipment, harmonic wave, subharmonic, clutter fall into the main passband of highly sensitive receiving device with
When in mirror image passband, then the transmitting equipment constitutes potential interference pair with highly sensitive receiving device.
6. disturb true in the microwave load satellite according to any one of claim 1 or 3 in highly sensitive antenna of receiving device band
Determine method, it is characterised in that：The potential electromagnetic interference to being disturbed comprising two types between two equipment, respectively coupling between antenna
Close interference and housing leaks interference, step (3) calculates the interference margins that potential interference is disturbed two types, takes both most respectively
It is big to be worth as the interference margins of electromagnetic interference pair.
7. determination method is disturbed in microwave load satellite according to claim 6 in highly sensitive antenna of receiving device band, its
It is characterised by：The interference margins IM of coupling type interference is calculated using following equation between the antenna：
IM=P (fE)-LCE1-Lt-Ltr-Lr-PR(fR)
In formula,
P(fE) be transmitting equipment transmission signal center frequency point fECorresponding power；
LCE1It is to launch power of the equipment transmission signal at receiving device center frequency point relative to work(at transmission signal center frequency point
The attenuation of rate, unit dB.
LtFor transmitting equipment and transmitting antenna between at receiving device center frequency point corresponding feeder loss, unit dB；
LtrIt is the isolation between receiving and transmitting, unit dB；
LrFor between receiving device and antenna of receiving device at receiving device center frequency point corresponding feeder loss unit dB；
PR(fR) be response frequency be fRWhen, receiving device susceptibility threshold, unit dBm, fRIt is the centre frequency of receiving device.
8. determination method is disturbed in microwave load satellite according to claim 6 in highly sensitive antenna of receiving device band, its
It is characterised by that the interference margins IM of the housing leak type interference is calculated using following equation：
IM=E1-20log(R)+20log(λ)+20log(GR)-127-Ispace-PR(fR)
In formula, E1For the unintended radiation of the transmitting equipment of potential interference centering launches field intensity, unit dBuV/m；
R is distance of the transmitting equipment of potential interference centering apart between the receiving device sensitive reception antenna of potential interference centering,
Unit m；
λ receives the corresponding signal wavelength of working frequency, unit m for the receiving device of potential interference centering；
GRIt is the gain of the receiving device reception antenna of potential interference centering, unit dB；
IspaceIt is the degree of screening that satellite structure between jamming equipment and antenna causes, unit dB；
PR(fR) be response frequency be fRWhen receiving device susceptibility threshold, unit dBm；
fRIt is the centre frequency of receiving device.
9. determination method is disturbed in microwave load satellite according to claim 1 in highly sensitive antenna of receiving device band, its
It is characterised by that the microwave absorbing property of the absorbing material is not less than 30dB.
10. determination method is disturbed in microwave load satellite according to claim 1 in highly sensitive antenna of receiving device band, its
It is characterised by that the default thresholding is -3dB~0dB.
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