CN105227248A - The method of testing of a kind of FM broadcast to aerial navigation B1 class interference protection standard - Google Patents
The method of testing of a kind of FM broadcast to aerial navigation B1 class interference protection standard Download PDFInfo
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- CN105227248A CN105227248A CN201410317699.4A CN201410317699A CN105227248A CN 105227248 A CN105227248 A CN 105227248A CN 201410317699 A CN201410317699 A CN 201410317699A CN 105227248 A CN105227248 A CN 105227248A
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Abstract
The present invention discloses the method for testing of a kind of FM broadcast to aerial navigation B1 class interference protection standard, by theory analysis, 3 is met the FM signal f of B1 interfering frequency combination condition
1>=f
2aMP.AMp.Amp gt; f
3the test of protective standard level is reduced to 1 the FM signal f the highest to its medium frequency
1the test of cutoff, increases progressively the level of 3 FM signals until B1 interference occurs first simultaneously, then deposits in case in B1 interference, increase f simultaneously
2, f
3signal level, and reduce f gradually
1level, work as f
1level is basicly stable, no longer with f
2, f
3the increase of signal level and when declining, this stable f
1signal level can be defined as protective standard level.This approach simplifies the situation of level combinations, test process is simply effective.
Description
Technical field
The present invention relates to communication technical field, particularly relate to 87-108MHz broadcasting service to electromagnetic compatible testing method between 108-118MHz aerial navigation business.
Background technology
Along with the development of FM broadcasting business and Commercial Air Service, the modulating FM broadcast of 87-108MHz is increasingly serious to the interference of 108-118MHz aerial navigation business, in the region had, even severe jamming has arrived the safe operation of civil aviaton, day by day increases the equipment of interference detection, analysis and method demand.
The Electro Magnetic Compatibility that International Telecommunication Association starts between frequency-modulation broadcasting business and aeronautical radio navigation service is very early studied, and has in succession promulgated the related advisory book about compatibility analysis.I.e. " compatibility between 87-108MHz FM broadcasting business and 108-137MHz aeronautical radio navigation service " ITU-RSM.1009-1 recommendation, describes the EMC analysis evaluation criteria between ILS, VOR, COM system and FM broadcasting business, general evaluation method, signal characteristic and interference mechanism etc.ITU-RSM.1140 recommendation i.e. " 87-108MHz broadcasting service and 108-118MHz aeronautical radio navigation service electromagnetic compatibility test flow process " gives method and flow process that between two kinds of business, ElectroMagnetic Compatibility is tested.
But in ITU-RSM.1140 recommendation, interference criterion is only gived to the method for testing of B1 class Intermodulation Interference, but the combined sorting method of intermodulation broadcast singal level is not provided, because the quantity of multiple FM signal intermodulation combination is many, test process is made to lack effective specific implementation method.
B1 class interference uniformity test in ITU-RSM.1140 recommendation:
Define the method for protective standard: can at △ f
3cause the minimum FM equisignal level (dBm) of interference.
△ f
3(MHz)
3=(f
a– f
1)
2(f
a– f
2) 2 RSTs
=(f
a– f
1) (f
a– f
2) (f
a– f
3) 3 RSTs
Wherein,
F
a: aerial navigation frequency (MHz)
F
1, f
2, f
3: FM broadcasting frequency (MHz) and f
1>f
2>f
3
According to the above-mentioned method defining protective standard, when forming B1 interference, FM combination of frequency meets the following conditions:
2 RSTs: 2f
1– f
2=f
a
3 RSTs: f
1+ f
2– f
3=f
a
2 RSTs are f
1=f
2time 3 RSTs special case, after only analyze the situation of 3 signals.
According to ITU-RSM.1009-1 recommendation, 3 signals form the criterion of B1 interference, except meeting said frequencies combination condition, level also need satisfied 3 judgment condition:
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 must be greater than certain value.
Criterion is disturbed according to above-mentioned B1; 3 FM signals meeting combination of frequency condition; when forming B1 interference; their level combinations is for infinite many; the combination of infinite multiple level is namely had to meet this 3 necessary conditions; cannot go to find wherein minimum FM signal level when testing, i.e. protective standard level at all.
Therefore according to ITU-RSM.1140 recommendation, except the B1 disturbed test experiment carrying out infinite many FM level combinations, according to the investigation of inventor, there is no relevant effective B1 protective standard level detecting method at present.
Summary of the invention
In order to solve the problem in background technology, the invention provides the method for testing of a kind of FM broadcast to aerial navigation B1 class interference protection standard, known by theory analysis, can cause minimum FM that aerial navigation receiver B1 disturbs broadcast level only may from the highest broadcast singal of its medium frequency, thus the test 3 being met the FM signal minimum level of B1 interfering frequency combination condition is reduced to the test to 1 the highest FM signal cutoff of its medium frequency, and other 2 FM signals are adopted to the method for testing of level synchronization increase and decrease, thus simplify the situation of level combinations, method of testing simplifies greatly, test process is simply effective.Its method is:
Step one, combination frequency: according to the combination of frequency condition f of B1 class interference
1+ f
2– f
3=f
a, list a certain broadcasting frequency combination f needing to measure
1, f
2, f
3, and 108MHz>f
1>=f
2>f
3, aviation frequency f
a>108MHz;
Step 2, screening highest frequency FM signal: at aerial navigation receiver inlet, due to f
1>f
2>f
3, f
1frequency closest to aviation frequency f
a, therefore, it is possible to the minimum FM broadcast level causing aerial navigation receiver B1 interference only may from broadcast singal f
1, and f
1signal level must be greater than cutoff and B1 just can be caused to disturb, therefore f
1the cutoff level of signal is protective standard level;
Step 3, the level detecting precision of setting protective standard is n (dBm), and 3 FM signals meeting combination frequency, from same small electric is flat, upwards increase progressively with n (dBm) stepping, until first time occurs that B1 disturbs, the same level recording now 3 signals is N;
Step 4, fixing f
2, f
3signal level is N, reduces f gradually with n (dBm)
1level, until interference just disappears, this signal level N1 of record interference disappearance eve;
Step 5, increases f simultaneously
2, f
3signal level, increase n (dBm) at every turn, often increase once, just reduce f with n (dBm) stepping gradually
1level, until interference just disappears, this signal level of record interference disappearance eve, upgrades level for this reason by N1;
Step 6, repeats step 5, until N1 is basicly stable, no longer with f
2, f
3the increase of signal level and declining, shows that N1 can cause minimum levels value that B1 disturbs, can think that N1 is exactly f
1cutoff, the protective standard level recorded exactly.
Owing to have employed above-mentioned technical method, the invention possesses following beneficial effect:
(1) test of 3 FM signal minimum level will be reduced to the test to 1 the highest FM signal cutoff of its medium frequency, method of testing simplifies greatly, and test process is simply effective.
(2) other 2 FM signals are adopted to the method for testing of level synchronization increase and decrease, thus simplify the situation of level combinations.
(3) B1 interference protection standard method of test in ITU-RSM.1140 recommendation is specialized, be no longer the test to infinite many level combinations, make it possess exploitativeness.
Accompanying drawing explanation
Accompanying drawing is the method for testing block diagram that FM of the present invention broadcasts to aerial navigation B1 class interference protection standard.1 corresponding step one in figure, 2 corresponding step 2,3 corresponding step 3,4 corresponding step 4 and step 5,5 corresponding step 6.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further expalined, but following examples shall not be construed as limiting the present invention.
The principle first providing the interference of B1 class illustrates, it is non-linear that the broadcast singal beyond aviation frequency band makes aerial navigation receiver enter, and may produce Inter Modulation on aerial navigation receiver, is called that B1 class is disturbed.Produce this type interference, need at least two broadcast singals, and certain frequency relation must be there is, in non-linear process, the useful radio-frequency channel that can use at aviation receiver produces intermodulation product.One of them broadcast singal must have enough amplitudes, makes receiver enter nonlinear area.
Its three order frequencies intermodulation situation is:
F
a=2f
1– f
2the situation of two signals
F
a=f
1+ f
2– f
3the situation of three signals
Wherein:
F
a: intermodulation product frequency (MHz)
F
1, f
2, f
3: broadcasting frequency (MHz) and f
1>=f
2>f
3
According to ITU-RSM.1140 recommendation, the method that B1 class interference uniformity test defines protective standard is:
Can at △ f
3cause the minimum FM equisignal level (dBm) of interference.
△ f
3(MHz)
3=(f
a– f
1)
2(f
a– f
2) 2 RSTs
=(f
a– f
1) (f
a– f
2) (f
a– f
3) 3 RSTs
Wherein,
F
a: aerial navigation frequency (MHz)
F
1, f
2, f
3: FM broadcasting frequency (MHz) and f
1>f
2>f
3
According to the above-mentioned method defining protective standard, when forming B1 interference, FM combination of frequency meets the following conditions:
2 RSTs: 2f
1– f
2=f
a
3 RSTs: f
1+ f
2– f
3=f
a
2 RSTs are f
1=f
2time 3 RSTs special case, after only analyze the situation of 3 signals.
According to ITU-RSM.1009-1 recommendation, 3 signals form B1 and disturb criterion, except meeting said frequencies combination condition, level also need satisfied 3 judgment condition:
Necessary condition one, wherein 1 FM signal must reach initiation value
L
c: according to the modifying factor (dB) of useful signal level change
During K=tri-RST, ILS is 146, VOR is 139
F is broadcasting frequency f
1, f
2and f
3
Necessary condition two, all FM signals must reach cutoff
Necessary condition three, the level sum of 3 FM signals must be greater than certain value
N
1–28log{max(1.0；f
A–f1)}+
N
2–28log{max(1.0；f
A–f2)}+
N
3–28log{max(1.0；f
A–f3)}+K+6–L
c>0
N
1, N
2, N
3: aviation receiver inlet is corresponding broadcasting frequency f respectively
1, f
2and f
3broadcast singal level (dBm),
K=ILS value is 140, VOR value is 133
L
c: the modifying factor (dB) of ILS localizer and VOR signal level variation
In conjunction with judgement necessary condition one, two, three known, cutoff is the minimum level of all FM signals forming B1 interference, and therefore protective standard level is exactly the value that in 3 FM signals, cutoff is minimum.
At aerial navigation receiver inlet, f
1frequency the highest, and closest to aviation frequency f
a, more close to aerial navigation frequency, interference potential is larger, then in conjunction with necessary condition two, the known minimum FM that can cause aerial navigation receiver B1 interference broadcasts level only may from broadcast singal f
1, this level is protective standard level, namely f
1cutoff.
Below just by the method for test, find out f
1cutoff, i.e. protective standard value, because protective standard value is determined from frequency f
1, and do not spend test f
2and f
3cutoff, decrease test volume, make test greatly simplify.Concrete grammar is:
Step one, combination frequency: according to the combination of frequency condition f of B1 class interference
1+ f
2– f
3=f
a, list a certain broadcasting frequency combination f needing to measure
1, f
2, f
3, and 108MHz>f
1>=f
2>f
3, aviation frequency f
a>108MHz;
Step 2, screening highest frequency FM signal: at aerial navigation receiver inlet, due to f
1>f
2>f
3, f
1frequency closest to aviation frequency f
a, therefore, it is possible to the minimum FM broadcast level causing aerial navigation receiver B1 interference only may from broadcast singal f
1, and f
1signal level must be greater than cutoff and B1 just can be caused to disturb, therefore f
1the cutoff level of signal is protective standard level;
Step 3, the level detecting precision of setting protective standard is n (dBm), and 3 FM signals meeting combination frequency, from same small electric is flat, upwards increase progressively with n (dBm) stepping, until first time occurs that B1 disturbs, the same level recording now 3 signals is N;
Step 4, fixing f
2, f
3signal level is N, reduces f gradually with n (dBm)
1level, until interference just disappears, this signal level N1 of record interference disappearance eve;
Step 5, increases f simultaneously
2, f
3signal level, increase n (dBm) at every turn, often increase once, just reduce f with n (dBm) stepping gradually
1level, until interference just disappears, this signal level of record interference disappearance eve, upgrades level for this reason by N1;
Step 6, repeats step 5, until N1 is basicly stable, no longer with f
2, f
3the increase of signal level and declining, shows that N1 can cause minimum levels value that B1 disturbs, can think that N1 is exactly f
1cutoff, the protective standard level recorded exactly.
More than show and describe general principle of the present invention and principal character, advantage.2 signal Intermodulation Interference situations are special cases of above 3 signal Intermodulation Interference situations, thus also belong within scope.Described above is the situation of uniformity test, when frequency deviation is tested, also can use the same method, therefore also belong within scope.The present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all should be included within protection scope of the present invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (2)
1. the method for testing of a FM broadcast to aerial navigation B1 class interference protection standard, it is characterized in that: known by theory analysis, can cause minimum FM that aerial navigation receiver B1 disturbs broadcast level only may from the highest broadcast singal of its medium frequency, thus the test 3 being met the FM signal minimum level of B1 interfering frequency combination condition is reduced to the test to 1 the highest FM signal cutoff of its medium frequency, and other 2 FM signals are adopted to the method for testing of level synchronization increase and decrease, thus simplify the situation of level combinations, method of testing simplifies greatly, test process is simply effective.
2. the method for testing of FM broadcast to aerial navigation B1 class interference protection standard, is characterized in that: method of testing comprises several step below:
Step one, combination frequency: according to the combination of frequency condition f of B1 class interference
1+ f
2– f
3=f
a, list a certain broadcasting frequency combination f needing to measure
1, f
2, f
3, and 108MHz>f
1>=f
2>f
3, aviation frequency f
a>108MHz;
Step 2, screening highest frequency FM signal: at aerial navigation receiver inlet, due to f
1>f
2>f
3, f
1frequency closest to aviation frequency f
a, therefore, it is possible to the minimum FM broadcast level causing aerial navigation receiver B1 interference only may from broadcast singal f
1, and f
1signal level must be greater than cutoff and B1 just can be caused to disturb, therefore f
1the cutoff level of signal is protective standard level;
Step 3, the level detecting precision of setting protective standard is n (dBm), and 3 FM signals meeting combination frequency, from same small electric is flat, upwards increase progressively with n (dBm) stepping, until first time occurs that B1 disturbs, the same level recording now 3 signals is N;
Step 4, fixing f
2, f
3signal level is N, reduces f gradually with n (dBm)
1level, until interference just disappears, this signal level N1 of record interference disappearance eve;
Step 5, increases f simultaneously
2, f
3signal level, increase n (dBm) at every turn, often increase once, just reduce f with n (dBm) stepping gradually
1level, until interference just disappears, this signal level of record interference disappearance eve, upgrades level for this reason by N1;
Step 6, repeats step 5, until N1 is basicly stable, no longer with f
2, f
3the increase of signal level and declining, shows that N1 can cause minimum levels value that B1 disturbs, can think that N1 is exactly f
1cutoff, the protective standard level recorded exactly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410317699.4A CN105227248B (en) | 2014-07-05 | 2014-07-05 | A kind of method of testing of FM broadcast to aerial navigation B1 class interference protection standards |
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|---|---|---|---|
| CN201410317699.4A CN105227248B (en) | 2014-07-05 | 2014-07-05 | A kind of method of testing of FM broadcast to aerial navigation B1 class interference protection standards |
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|---|---|
| CN105227248A true CN105227248A (en) | 2016-01-06 |
| CN105227248B CN105227248B (en) | 2017-11-03 |
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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 |
-
2014
- 2014-07-05 CN CN201410317699.4A patent/CN105227248B/en not_active Expired - Fee Related
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 |
|---|
| ITU: "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-R SM.1140》 * |
| 刘晓蓉: "调频广播对甚高频地空通信干扰的机理分析", 《广播与电视技术》 * |
| 李文光: "调频广播和航空导航、移动业务间的电磁兼容", 《广播与电视技术》 * |
| 海霞等: "调频广播与航空无线电业务B1类干扰分析方法", 《电视技术》 * |
| 肖社生: "调频广播信号对民航通信频率的干扰估计及应对措施", 《广播与电视技术》 * |
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Granted publication date: 20171103 Termination date: 20180705 |