CN105227248B - A kind of method of testing of FM broadcast to aerial navigation B1 class interference protection standards - Google Patents
A kind of method of testing of FM broadcast to aerial navigation B1 class interference protection standards Download PDFInfo
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- CN105227248B CN105227248B CN201410317699.4A CN201410317699A CN105227248B CN 105227248 B CN105227248 B CN 105227248B CN 201410317699 A CN201410317699 A CN 201410317699A CN 105227248 B CN105227248 B CN 105227248B
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Abstract
The present invention discloses a kind of method of testing of FM broadcast to aerial navigation B1 class interference protection standards, by theory analysis, the FM signals f for meeting B1 interfering frequency combination conditions by 31≥f2>f3The test of protective standard level is reduced to wherein 1 FM signals f of frequency highest1The test of cutoff, first while incrementally the level of 3 FM signals is until B1 disturbs appearance, then in the presence of B1 interference, while increasing f2、f3Signal level, and gradually reduce f1Level, work as f1Level is basicly stable, no longer with f2、f3The increase of signal level and when declining, this stable f1Signal level can be identified as protective standard level.This approach simplifies the situation of level combinations, test process is easy and effective.
Description
Technical field
108-118MHz aviations are led the present invention relates to communication technical field, more particularly to 87-108MHz broadcasting services
Electromagnetic compatible testing method between boat business.
Background technology
With the development of frequency modulation broadcasting business and Commercial Air Service, 87-108MHz modulating FM is broadcasted to 108-118MHz
The interference of aerial navigation business is increasingly serious, and in the region having, even severe jamming has arrived the safe operation of civil aviaton, to dry
Disturbing detection, the apparatus and method demand of analysis increasingly increases.
The Electro Magnetic Compatibility that International Telecommunication Association begins between frequency-modulation broadcasting business and aeronautical radio navigation service very early is ground
Study carefully, the related advisory book on compatibility analysis has been promulgated in succession.ITU-R SM.1009-1 recommendations are《87-108MHz is adjusted
Compatibility between frequency broadcasting service and 108-137MHz aeronautical radio navigation services》, describe ILS, VOR, COM system and tune
EMC analysis evaluation criteria, general evaluation method, signal characteristic and interference mechanism between frequency broadcasting service etc..ITU-R
SM.1140 recommendations are《87-108MHz broadcasting services and 108-118MHz aeronautical radio navigation service electromagnetic compatibility test streams
Journey》Give ElectroMagnetic Compatibility is tested between two kinds of business method and flow.
But in ITU-R SM.1140 recommendations, the method for testing to B1 class Intermodulation Interferences only gives interference judgement mark
Standard, the combined sorting method of intermodulation broadcast singal level is not provided but, due to multiple FM signals intermodulation combine quantity very
As many as so that test process lacks effective specific implementation method.
By taking the B1 classes interference uniformity test in ITU-R SM.1140 recommendations as an example：
The method for defining protective standard：Can be in △ f3Trigger the minimum FM equisignals level (dBm) of interference.
△f3(MHz)3=(fA–f1)2(fA–f2) 2 signal conditions
=(fA–f1)(fA–f2)(fA–f3) 3 signal conditions
Wherein,
fA:Aerial navigation frequency (MHz)
f1, f2, f3:FM broadcasting frequencys (MHz) and f1>f2>f3
According to the above-mentioned method for defining protective standard, when forming B1 interference, FM combination of frequencies meet following condition：
2 signal conditions：2f1–f2=fA
3 signal conditions：f1+f2–f3=fA
2 signal conditions are f1=f2When 3 signal conditions special case, behind only analyze 3 signals situation.
According to ITU-R SM.1009-1 recommendations, the criterion of 3 signal formation B1 interference, except meeting above-mentioned frequency
Outside rate combination condition, also need to meet 3 judgment conditions on level：
Necessary condition one, wherein 1 FM signal must reach initiation value；
Necessary condition two, all FM signals must reach cutoff；
Necessary condition three, the level sum of 3 FM signals have to be larger than certain value.
According to above-mentioned B1 disturb criterion, 3 meet combination of frequency condition FM signals, formed B1 interference when, they
Level combinations to be infinite many, that is, the combination for having infinite multiple level meets this 3 necessary conditions, the basic nothing when testing
Method looks for wherein minimum FM signal levels, i.e. protective standard level.
Therefore according to ITU-R SM.1140 recommendations, the B1 disturbed tests experiment except carrying out infinite many FM level combinations
Outside, according to the investigation of inventor, the effective B1 protective standards level detecting method of correlation is there is no at present.
The content of the invention
The problem of in order to solve in background technology, the invention provides a kind of FM broadcast and disturbs guarantor to aerial navigation B1 classes
The method of testing of shield standard, by theory analysis, the minimum FM broadcast electricity that aerial navigation receiver B1 can be triggered to disturb
It is flat to be only possible to from wherein frequency highest broadcast singal, so that the FM signals for meeting B1 interfering frequency combination conditions by 3 are most
Low level test is reduced to the test to wherein 1 FM signal cutoff of frequency highest, and other 2 FM signals are used
The method of testing of level synchronization increase and decrease, so as to simplify the situation of level combinations, method of testing is greatly simplified, and test process is simple
Effectively.Its method is：
Step one, combination frequency：The combination of frequency condition f disturbed according to B1 classes1+f2–f3=fA, listing needs what is measured
A certain broadcasting frequency combines f1, f2, f3, and 108MHz>f1≥f2>f3, aviation frequency fA>108MHz；
Step 2, screens highest frequency FM signals：In aerial navigation receiver inlet, due to f1>f2>f3, f1Frequency
Closest to aviation frequency fA, it is only possible to therefore, it is possible to trigger the minimum FM that aerial navigation receiver B1 is disturbed to broadcast level from wide
Broadcast signal f1, and f1Signal level, which have to be larger than cutoff, can just cause B1 to disturb, therefore f1The cutoff level of signal is to protect
Protect fiduciary level；
Step 3, sets the level detecting precision of protective standard as n (dBm), 3 meet combination frequency FM signals from same
One small electric is opened flat the beginning, is incremented by upwards with n (dBm) stepping, until there is B1 interference for the first time, record now 3 signals it is same
Level is N；
Step 4, fixed f2、f3Signal level is N, and f is gradually reduced with n dBm1Level, until interference just disappear,
The f of record interference disappearance eve1Signal critical jamming level N1, i.e. f1Level still have an interference when being N1, and f1Level be
Disturb and disappear during N1-n；
Step 5, while increasing f2、f3Signal level, every time increase n dBm, due to fx, f3Signal level increase then
f1Signal critical jamming level may reduce, and often increase a f2、f3Signal level, is just gradually dropped since N1 with n dBm steppings
Low f1Level, until interference just disappear, record interference disappearance eve f1Signal critical jamming level N2, i.e. f1Electricity
Still there is interference when putting down as N2, and f1Level be N2-n when interference disappear, N1 is updated to this level, i.e. N1=N2；
Step 6, repeat step five, until N1 is basicly stable, no longer with f2、f3The increase of signal level and decline, show
N1 has been the minimum levels value that B1 can be caused to disturb, it is believed that N1 is exactly f1Cutoff, the protection exactly measured
Fiduciary level.
As a result of above-mentioned technical method, the invention possesses following beneficial effect：
(1) test to 3 FM signal minimum levels is reduced to wherein 1 FM signal cutoff of frequency highest
Test, method of testing is greatly simplified, and test process is easy and effective.
(2) method of testing that level synchronization increases and decreases is used to other 2 FM signals, so as to simplify the feelings of level combinations
Condition.
(3) B1 interference protections standard method of test in ITU-R SM.1140 recommendations is embodied, is no longer to infinite many
The test of level combinations, makes it possess exploitativeness.
Brief description of the drawings
Accompanying drawing is method of testing block diagram of the FM broadcast of the present invention to aerial navigation B1 class interference protection standards.1 pair in figure
Answer step one, 2 corresponding step 2,3 corresponding step 3,4 correspondence step 4 and step 5,5 corresponding step 6.
Embodiment
The present invention is further expalined below in conjunction with the accompanying drawings, but following examples shall not be construed as the limit to the present invention
System.
First providing the broadcast singal beyond the principle explanation of B1 classes interference, aviation frequency band causes aerial navigation receiver to enter
It is non-linear, Inter Modulation may be produced on aerial navigation receiver, referred to as B1 classes are disturbed.This type interference is produced, is needed
There are at least two broadcast singals, and there must be certain frequency relation, can be in aviation receiver in non-linear process
Intermodulation product is produced in the useful radio-frequency channel used.One of broadcast singal must have enough amplitudes, enter receiver
Enter nonlinear area.
Thirdly order frequency intermodulation situation is：
fA=2f1–f2The situation of two signals
fA=f1+f2–f3The situation of three signals
Wherein：
fA：Intermodulation product frequency (MHz)
f1, f2, f3：Broadcasting frequency (MHz) and f1≥f2>f3
According to ITU-R SM.1140 recommendations, the method that B1 classes interference uniformity test defines protective standard is：
The minimum FM equisignals level (dBm) of interference can be triggered in △ f 3.
(MHz) 3=of △ f 3 (fA–f1)2(fA–f2) 2 signal conditions
=(fA–f1)(fA–f2)(fA–f3) 3 signal conditions
Wherein,
fA:Aerial navigation frequency (MHz)
f1, f2, f3:FM broadcasting frequencys (MHz) and f1>f2>f3
According to the above-mentioned method for defining protective standard, when forming B1 interference, FM combination of frequencies meet following condition：
2 signal conditions：2f1–f2=fA
3 signal conditions：f1+f2–f3=fA
2 signal conditions are f1=f2When 3 signal conditions special case, behind only analyze 3 signals situation.
According to ITU-R SM.1009-1 recommendations, 3 signal formation B1 interference criterions, except meeting said frequencies
Outside combination condition, also need to meet 3 judgment conditions on level：
Necessary condition one, wherein 1 FM signal must reach initiation value
Lc：The modifying factor (dB) changed according to useful signal level
During tri- signal conditions of K=, ILS is that 146, VOR is 139
F is broadcasting frequency f1、f2And f3
Necessary condition two, all FM signals must reach cutoff
Necessary condition three, the level sum of 3 FM signals have to be larger than certain value
N1–28log{max(1.0；fA–f1)}+
N2–28log{max(1.0；fA–f2)}+
N3–28log{max(1.0；fA–f3)}+K+6–Lc>0
N1, N2, N3：Aviation receiver inlet corresponds to broadcasting frequency f respectively1、f2And f3Broadcast singal level (dBm),
K=ILS values are that 140, VOR values are 133
Lc:The modifying factor (dB) of ILS localizers and VOR signal level variations
Understood with reference to judgement necessary condition one, two, three, cutoff is the minimum electricity for all FM signals to form B1 interference
It is flat, therefore protective standard level is exactly a value of cutoff minimum in 3 FM signals.
In aerial navigation receiver inlet, f1Frequency highest, and closest to aviation frequency fA, closer to aerial navigation
Frequency, interference potential is bigger, in conjunction with necessary condition two, it is known that the minimum FM that aerial navigation receiver B1 can be triggered to disturb
Broadcast level is only possible to come from broadcast singal f1, this level be protective standard level, that is, f1Cutoff.
F is just found out by the method for test below1Cutoff, i.e. protective standard value, because protective standard value determines to come
From frequency f1, without spending test f2And f3Cutoff, reduce test volume so that test greatly simplify.Specific method is：
Step one, combination frequency：The combination of frequency condition f disturbed according to B1 classes1+f2–f3=fA, listing needs what is measured
A certain broadcasting frequency combines f1, f2, f3, and 108MHz>f1≥f2>f3, aviation frequency fA>108MHz；
Step 2, screens highest frequency FM signals：In aerial navigation receiver inlet, due to f1>f2>f3, f1Frequency
Closest to aviation frequency fA, it is only possible to therefore, it is possible to trigger the minimum FM that aerial navigation receiver B1 is disturbed to broadcast level from wide
Broadcast signal f1, and f1Signal level, which have to be larger than cutoff, can just cause B1 to disturb, therefore f1The cutoff level of signal is to protect
Protect fiduciary level；
Step 3, sets the level detecting precision of protective standard as n (dBm), 3 meet combination frequency FM signals from same
One small electric is opened flat the beginning, is incremented by upwards with n (dBm) stepping, until there is B1 interference for the first time, record now 3 signals it is same
Level is N；
Step 4, fixed f2、f3Signal level is N, and f is gradually reduced with n dBm1Level, until interference just disappear,
The f of record interference disappearance eve1Signal critical jamming level N1, i.e. f1Level still have an interference when being N1, and f1Level be
Disturb and disappear during N1-n；
Step 5, while increasing f2、f3Signal level, every time increase n dBm, due to f2、f3Signal level increase then
f1Signal critical jamming level may reduce, and often increase a f2、f3Signal level, is just gradually dropped since N1 with n dBm steppings
Low f1Level, until interference just disappear, record interference disappearance eve f1Signal critical jamming level N2, i.e. f1Electricity
Still there is interference when putting down as N2, and f1Level be N2-n when interference disappear, N1 is updated to this level, i.e. N1=N2；
Step 6, repeat step five, until N1 is basicly stable, no longer with f2、f3The increase of signal level and decline, show
N1 has been the minimum levels value that B1 can be caused to disturb, it is believed that N1 is exactly f1Cutoff, the protection exactly measured
Fiduciary level.
The general principle and principal character, advantage of the present invention has been shown and described above.2 signal Intermodulation Interference situations be with
The special case of upper 3 signal Intermodulation Interference situation, thus fall within the scope of the present invention.Described above is uniformity test
Situation, when frequency deviation is tested, it is also possible to same method, therefore fall within the scope of the present invention.The present invention not by
Merely illustrating the principles of the invention described in the limitation of above-described embodiment, above-described embodiment and specification, is not departing from this hair
On the premise of bright spirit and scope, various changes and modifications of the present invention are possible, and these changes and improvements should all be included in this hair
Within bright protection domain.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (1)
1. a kind of FM broadcast is to the method for testing of aerial navigation B1 class interference protection standards, it is characterized in that：Method of testing is included down
The several steps in face：
Step one, combination frequency：The combination of frequency condition f1+f2-f3=fA disturbed according to B1 classes, listing needs a certain of measurement
Broadcasting frequency combines f1, f2, f3, and 108MHz>f1≥f2>F3, aviation frequency fA>108MHz；
Step 2, screens highest frequency FM signals：In aerial navigation receiver inlet, due to f1>f2>F3, f1 frequency are most
Close to aviation frequency fA, broadcasted therefore, it is possible to trigger the minimum FM broadcast level that aerial navigation receiver B1 is disturbed to be only possible to come from
Signal f1, and f1 signal levels have to be larger than cutoff and can just cause B1 to disturb, therefore the cutoff level of f1 signals is to protect
Protect fiduciary level；
Step 3, sets the level detecting precision of protective standard as n dBm, 3 meet combination frequency FM signals from it is same compared with
Small level starts, and is incremented by upwards with n dBm steppings, until occurring B1 interference for the first time, the same level for recording now 3 signals is
N；
Step 4, fixed f2, f3 signal level is N, and f1 level is gradually reduced with n dBm, until interference just disappears, is recorded
Still there is interference when disturbing the f1 signal critical jamming level N1 of disappearance eve, i.e. f1 level for N1, and f1 level is N1-
Disturb and disappear during n；
Step 5, while increasing f2, f3 signal level, increases n dBm every time, because f2, f3 signal level increase then f1
Signal critical jamming level may reduce, and often increase f2, f3 signal level, just gradually be dropped since N1 with n dBm steppings
Low f1 level, until interference just disappears, the f1 signal critical jamming level N2 of record interference disappearance eve, i.e. f1 electricity
Still have interference when putting down as N2, and f1 level when being N2-n interference disappear, N1 is updated to this level, i.e. N1=N2；
Step 6, repeat step five, until N1 is basicly stable, no longer declines with the increase of f2, f3 signal level, shows N1
Through being the minimum levels value that B1 can be caused to disturb, it is believed that N1 is exactly f1 cutoff, the protective standard exactly measured
Level.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919160A (en) * | 2007-11-29 | 2010-12-15 | 松下北美公司美国分部松下汽车系统公司 | The automatic frequency scope and the frequency step system of selection of territory of use's feature of numeral AM/FM tuner |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101919160A (en) * | 2007-11-29 | 2010-12-15 | 松下北美公司美国分部松下汽车系统公司 | The automatic frequency scope and the frequency step system of selection of territory of use's feature of numeral AM/FM tuner |
Non-Patent Citations (5)
| Title |
|---|
| TEST PROCEDURES FOR MEASURING AERONAUTICAL RECEIVER CHARACTERISTICS USED FOR DETERMINING COMPATIBILITY BETWEEN THE SOUND-BROADCASTING SERVICE IN THE BAND OF ABOUT 87-108 MHz AND THE AERONAUTICAL SERVICES IN THE BAND 108-118 MHz;ITU;《ITU-R SM.1140》;19951231 * |
| 调频广播与航空无线电业务B1类干扰分析方法;海霞等;《电视技术》;20140117;第38卷(第2期);第44-46，51页 * |
| 调频广播信号对民航通信频率的干扰估计及应对措施;肖社生;《广播与电视技术》;20120615(第6期);第120-123页 * |
| 调频广播和航空导航、移动业务间的电磁兼容;李文光;《广播与电视技术》;19930302(第1期);第15-19页 * |
| 调频广播对甚高频地空通信干扰的机理分析;刘晓蓉;《广播与电视技术》;20140515;第41卷(第5期);第95-97页 * |
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