CN104730497B - Implementation method for limiting electromagnetic interference caused by system interrogation - Google Patents

Implementation method for limiting electromagnetic interference caused by system interrogation Download PDF

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CN104730497B
CN104730497B CN201510137663.2A CN201510137663A CN104730497B CN 104730497 B CN104730497 B CN 104730497B CN 201510137663 A CN201510137663 A CN 201510137663A CN 104730497 B CN104730497 B CN 104730497B
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inquiry
power
mode query
pattern
stepping
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CN104730497A (en
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李涛
刘永刚
王爱国
王耀兴
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Sichuan Jiuzhou ATC Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/933—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of aircraft or spacecraft

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Electromagnetism (AREA)
  • Traffic Control Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides an implementation method for limiting electromagnetic interference caused by system interrogation. A finally-generated C-mode interrogation list and an S-mode interrogation list meet three interference limitation inequations by repeatedly testing and adjusting interrogation power or interrogation steps. Under the circumstance that the three interference limitation inequations meet formula inequality sign relations, the gap range is within 5%, electromagnetic interference brought by carrier aircraft collision avoidance system interrogation is limited, the detection distance of system interrogation is increased, and the situation that a flight path of a target machine is revoked when the wave position passes is avoided.

Description

A kind of implementation method limiting system interrogation electromagnetic interference
Technical field
The present invention relates to a kind of implementation method limiting system interrogation electromagnetic interference, more particularly to one kind is applied in the air The implementation method of the restriction system interrogation electromagnetic interference of airborne collision avoidance system.
Background technology
Airborne collision avoidance system, is to prevent aerospace plane dangerous close to requisite with avoid absolutely empty accidents to occur Maximally effective air transportation safety guarantee equipment.It is based on secondary radar principle, by opening aviation management answering machine to neighbouring equipment Aircraft send that c pattern generally calls inquiry and s pattern is called the roll inquiry, receive and process c pattern and s pattern answer signal, generate mesh Mark flight path；Impended with respect to the state of motion of carrier aircraft according to target machine and detect and anticollision resolving, produce traffic alert and determine Disconnected alarm, sends ra simultaneously and coordinates message to the target machine possessing the ra coordination ability, realizes collaborative collision avoidance function.
Along with the fast development of aircraft industry in global range, the aircraft in spatial domain gets more and more, electromagnetism each other Interference is on the rise.Aviation management answering machine will reply the inquiry that all kinds of inquiry systems send, including ground blank pipe secondary radar system, The early warning monitoring system of airborne collision avoidance system and particular platform, all kinds of inquiry systems are all by the response money of competition aviation management answering machine Source.If airborne collision avoidance system inquiry number of times is excessively frequent or power is excessive, the response of aggrieved answering machine can be led to suppress Time lengthens, and the time opening response shortens, and other inquiry systems occur because can not receive the answer signal of aggrieved answering machine The serious problems such as target following is unstable, even lose batch.
Airborne collision avoidance system is passed through to reduce inquiry power or is reduced little sound calling inquiry stepping, can effectively reduce response The request signal quantity that machine receives, reduces the electromagnetic interference that system interrogation brings.Specifically it is simply that near will be according to carrier aircraft Target machine distribution situation, meet 3 interference limit inequality constraints, through repeatedly test and adjust, ultimately generate c Mode query list and s mode query list.
Above-mentioned little sound calling inquiry refers to generally call in conventional only c pattern is inquiry (comprising p1, p3, p4 pulse) base 1 interrogation pulse s1 is increased on plinth, s1 pulse is located at 2us before p1 pulse, and s1 pulse signal strength is less than p1 pulse.
Above-mentioned little sound type of call includes high-precision type, basic model and unitary type, before the inquiry stepping of high-precision type is distributed as To 24 steppings, left-hand 20 stepping, dextrad 20 stepping, backward 15 steppings；The inquiry stepping of basic model be distributed as before to 6 steppings, a left side To 5 steppings, dextrad 5 stepping, backward 4 steppings；Unitary type is sensu lato little sound calling inquiry, before its inquiry stepping is distributed as, Left and right, each 1 stepping backward.
3 above-mentioned interference limit inequality and are:
Inequality 1: σ i = 1 i [ p ( i ) 250 w ] α ≤ min { 280 nta + 1 , 11 α 2 }
Inequality 2: σ i = 1 i m ( i ) ≤ 0.01 Second
Inequality 3: 1 b σ k = 1 k [ pa ( k ) 250 w ] ≤ min { 80 nta + 1 , 3 }
Wherein, each meaning of parameters in inequality is as follows:
I monitors at one by carrier aircraft and updates the total inquiry number being sent in interval, but does not include air-air coordination inquiry；
I is the call number of all inquiries, but does not include coordinating inquiry, i=1,2,3 ... i；
P (i) be i ＆ lt c pattern or s mode query power (by watt in terms of)；
The number of aircraft that nta is the equipment tcas detecting during -74dbm for carrier aircraft answering machine receiver threshold；
B is the beam sharpening factor ratio of response wave beam width (the inquiry wave beam width being caused due to Interrogation side lobe suppression with)；
M (i) is the carrier aircraft answering machine response suppression time being associated with i ＆ lt inquiry；
K is that carrier aircraft monitors, at one, the c mode query sum updating transmission in interval；
K is the call number of c mode query, k=1,2,3 ... k；
Pa (k) be kth time c mode query power (by watt in terms of)；
α is carrier aircraft target machine distributed model quantized value nearby.
Above-mentioned little sound calling inquiry and interference restriction inequality are the bases realizing the suppression of airborne collision avoidance system electromagnetic interference Plinth.Space be divide into rang ring one by one by little sound calling inquiry, calls inquiry stepping for same little sound, only corresponding Answering machine ability response in rang ring, can reduce synchronous the mixing of answer signal to a great extent and disturb.Interference limits inequality and makees For realizing the constraints of AF panel, it is inquiry power and the direction of inquiry step by step modulating, meet interference and limit inequality Can think and reach the purpose that interference limits.
However, in prior art, the implementation method limiting the electromagnetic interference that system interrogation brings is although system can effectively be reduced The electromagnetic interference that system inquiry brings, but system interrogation detection range is limited.
Content of the invention
The technical problem to be solved in the present invention is that offer is a kind of can limit the electromagnetic interference that system interrogation brings, and can carry again The implementation method of the restriction system interrogation electromagnetic interference of high system interrogation detection range.
The technical solution used in the present invention is as follows: a kind of implementation method limiting system interrogation electromagnetic interference, concrete grammar For: by repeatedly testing and adjusting inquiry power or inquiry stepping so that the c mode query list that ultimately generates and s pattern Inquiry list meets 3 interference and limits inequality；Described 3 interference limit inequality in the situation meeting formula sign of inequality relation Under, gap scope is within 5%.
Preferably, concrete grammar step is:
First, calculate carrier aircraft target machine distributed model quantized value α and tcas ii target machine quantity nta nearby；
2nd, adjustment c mode query list limits inequality 3 to meet interference；
3rd, judge whether to be in 8 seconds lockup periods, be, lockup period successively decreases 1 second, and immediately returns to, terminate interference and limit Flow process, otherwise executes next step；
4th, adjustment c mode query list and s mode query list as to satisfy the inequality 2 and 1；
5th, pass through repeatedly to test and adjust inquiry power or inquiry stepping, carry out mating c pattern and s mode query is covered Lid scope is so that the c mode query list ultimately generating and s mode query list meet 3 interference and limit inequality, and makes Sign of inequality left and right difference is away from scope within 5%；
Described adjustment c mode query list refers to adjust the inquiry power of c pattern or inquiry stepping；Described adjustment s mould Formula inquiry list refers to adjust s mode query power.
Preferably, described c mode query list refers to the summation of 4 ripple position little sound calling inquiry steppings.
Preferably, described s mode query list refer to inquiry in need s type order target summation.
Preferably, described 4 ripple positions be respectively before to, left-hand, dextrad and backward.
Preferably, during adjustment c mode query list, successively suitable on ground or the adjustment of skyborne relation according to carrier aircraft Sequence, concrete method of adjustment is:
If a carrier aircraft is on ground, when needing to reduce power or reduce stepping, then before first adjusting to, until forward direction High-power and left and right peak power is mated, then adjusts left-hand and dextrad power, until left and right peak power with backward High-power coupling, finally adjusts backward power again, until the backward adjustment limit；Similarly, when needing to increase power or increase During stepping, first adjust backward, until backward peak power is mated with left and right peak power, then adjust left and right, until a left side, Dextrad peak power is mated with forward direction peak power, finally adjusts forward power again, until forward direction adjusts to the limit.
If b carrier aircraft is in the air, when needing to reduce power or reduce stepping, then to, left-hand, the right side before being sequentially adjusted in To, backward, so move in circles, if certain direction adjusts extremely limiting, skipping the direction and continuing to be sequentially adjusted in；Similar Ground, when needing to increase power or increase stepping, is then sequentially adjusted in backward, dextrad, left-hand, forward direction, so moves in circles, such as Really certain direction adjusts and extremely limits, then skip the direction and continue to be sequentially adjusted in.
Preferably, when carrying out s pattern and c mode query coverage coupling, comparing s pattern answering machine and traditional A/c pattern answering machine receiving sensitivity difference；If s pattern answering machine receiving sensitivity 3db higher than a/c pattern answering machine, work as c The maximum inquiry power of pattern just thinks that the inquiry coverage of c pattern surpasses when being more than maximum inquiry more than the power 3db of s pattern Cross the inquiry coverage of s pattern.
Preferably, the adjustment limit of c mode query list is: when carrier aircraft is on ground, forward direction at most reduces 10db, left At most reduce 6db to dextrad, at most reduce 1db backward；When carrier aircraft in the air when, 4 ripple positions at most reduce 7db；S pattern is ask The adjustment limit asking list is: when carrier aircraft is on ground, at most reduces (10+x) db；When carrier aircraft in the air when, at most reduce (7+ x)db；Wherein, x refers to that s pattern answering machine receiving sensitivity exceeds the difference of a/c pattern answering machine；No matter carrier aircraft is on ground also It is in the air, the peak power of c mode query list and s mode query list permission is 52dbm (nominal value).
Preferably, described c mode query list includes conventional inquiry stepping and extra increased inquiry stepping；S pattern Inquiry coverage exceedes the corresponding ripple position when prewave position c mode query coverage increases by 1 inquiry stepping；Increased stepping It is related to disturb the calculating limiting inequality, but be not involved in the power adjustment of conventional stepping；Increase stepping realization horizontal 360-degree with The coupling of s mode query coverage, also forms overlapping region with when prewave position c mode query coverage simultaneously.
Preferably, described overlapping region is relevant with the little sound calling inquiry type selecting when prewave position, physical relationship For:
If the little sound calling inquiry type that a works as the selection of prewave position is high-precision type, when when the maximum inquiry of prewave position c pattern When to ask power be even number, the stepping s1 pulse power of increase is as prewave position c pattern maximum inquiry power fall 1db；When working as prewave When c pattern maximum inquiry power in position is odd number, the stepping s1 pulse power of increase is when prewave position c pattern maximum inquiry power fall 2db；
If the little sound calling inquiry type that b works as the selection of prewave position is basic model, increased stepping s1 pulse power is As prewave position c pattern maximum inquiry power fall 6db；
If the little sound calling inquiry type that c works as the selection of prewave position is unitary type, increased stepping s1 pulse power is 28dbm (nominal value).
Compared with prior art, the invention has the beneficial effects as follows: both limited what the inquiry of aerial carrier aircraft CAS brought Electromagnetic interference, improve the detection range of system interrogation again, it is to avoid flight path revocation in ripple position when target machine passes through.
Brief description
Fig. 1 is the schematic flow sheet of a present invention wherein embodiment.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, not For limiting the present invention.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), except non-specifically is chatted State, all can be replaced by other alternative features equivalent or that there is similar purpose.I.e., unless specifically stated otherwise, each feature One of simply a series of equivalent or similar characteristics example.
The interference of this specific embodiment as shown in Figure 1 limits flow chart.It specifically comprises the steps of
Step0: calculate carrier aircraft target machine distributed model quantized value α nearby, in 20s before statistics, monitoring possesses tcas energy Target machine number nta of power；
Step1: constantly adjustment c mode query list, reduces c mode query power or inquiry stepping, until meeting dry Disturb restriction inequality 3；
Step2: judge whether to be in 8 seconds lockup periods；
Step2-1: if being in 8 seconds lockup periods, lockup period successively decreases 1 second, and immediately returns to, terminates interference and limits stream Journey；
Step2-2: if being not in 8 seconds lockup periods, enter step3；
Step3: judge whether c mode query list and s mode query list meet inequality 2 and 1；
Step3-1: if being unsatisfactory for inequality 2 and 1, judge whether s mode query coverage has exceeded c pattern and ask Ask coverage；
Step3-1-1: if s mode query coverage has exceeded c mode query coverage, s mode query work( Rate reduces 1db, the locking in 8 seconds of setting simultaneously, and immediately returns to, and terminates interference and limits flow process；
Step3-1-2: if s mode query coverage is not less than c mode query coverage, c mode query arranges Table reduces 1db power or reduces by 1 stepping inquiry, and jumps to step3；
Step3-2: if meeting inequality 2 and 1, judge whether s mode query coverage has exceeded c mode query Coverage；
Step3-2-1: if s mode query coverage has exceeded c mode query coverage, judge that c pattern is ask Ask that list increases 1db power or increase by 1 stepping asks whether to destroy inequality 3；
Step3-2-1-1: if inequality 3 will not be destroyed, judge whether to destroy inequality 2 or 1；
Step3-2-1-1-1: if inequality 2 or 1 can be destroyed, immediately return to, terminate interference and limit flow process；
Step3-2-1-1-2: if will not destroy inequality 2 or 1, c mode query list increase 1db power or Increase by 1 stepping, and jump to step3；
Step3-2-1-2: if inequality 3 can be destroyed, jump to step4；
Step3-2-2: if s mode query coverage, not less than c mode query coverage, jumps to step4；
Step4: judge whether to increase s mode query coverage；
Step4-1: if s mode query coverage can not be increased, immediately return to again, terminate interference and limit flow process；
Step4-2: if s mode query coverage can be increased again, s mode query power increases 1db, sets simultaneously Put locking in 8 seconds, immediately return to, terminate interference and limit flow process.
Wherein, the increase and decrease 1db power in above-mentioned steps or 1 stepping, needs selected little according to be adjusted ripple position Depending on sound calling inquiry type.If be adjusted the selection of ripple position is the calling inquiry of high-precision type little sound, for increasing and decreasing 1 stepping；As What fruit was adjusted the selection of ripple position is basic model or the calling inquiry of unitary type little sound, then for increasing and decreasing 1db power.
Ensure aggrieved answering machine in 1 second (nominal value) monitoring period is spaced to 30 nautical miles (nominal values) in the range of detect not 280 tcas inquiries can be exceeded；Ensure that carrier aircraft answering machine will not be because of the mutual suppression letter from the tcas equipment with machine Number and the pent time more than 1%；When ensureing that aggrieved answering machine answers all tcas inquiries in its detecting distance, at 1 second The c pattern response quantity producing in (nominal value) cycle is less than 40 times.

Claims (9)

1. a kind of implementation method limiting system interrogation electromagnetic interference, method particularly includes: by repeatedly testing and adjusting inquiry work( Rate or inquiry stepping are so that the c mode query list ultimately generating and s mode query list meet 3 interference and limit Formula；Described 3 interference limit inequality in the case of meeting formula sign of inequality relation, and gap scope is within 5%；
Concrete grammar step is:
First, calculate carrier aircraft target machine distributed model quantized value α and tcas ii target machine quantity nta nearby；
2nd, adjustment c mode query list limits inequality 3 to meet interference；
3rd, judge whether to be in 8 seconds lockup periods, be, lockup period successively decreases 1 second, and immediately returns to, terminate interference and limit flow process, Otherwise execute next step；
4th, adjustment c mode query list and s mode query list limit inequality 2 and 1 to meet interference；
5th, pass through repeatedly to test and adjust inquiry power or inquiry stepping, carry out mating c pattern and s mode query covers model Enclose so that the c mode query list ultimately generating and s mode query list meet 3 interference and limit inequality, and make Number left and right difference is away from scope within 5%；
Described adjustment c mode query list refers to adjust the inquiry power of c pattern or inquiry stepping；Described adjustment s pattern is ask Ask that list refers to adjust s mode query power；
3 interference limit inequality and are:
Interference restriction inequality 1:
Interference restriction inequality 2:
Interference restriction inequality 3:
Wherein, each meaning of parameters that interference limits in inequality is as follows:
I monitors at one by carrier aircraft and updates the total inquiry number being sent in interval, but does not include air-air coordination inquiry；
I is the call number of all inquiries, but does not include coordinating inquiry, i=1,2,3 ... i；
P (i) is the power of i ＆ lt c pattern or s mode query；
The number of aircraft that nta is the equipment tcas detecting during -74dbm for carrier aircraft answering machine receiver threshold；
B is the beam sharpening factor；
M (i) is the carrier aircraft answering machine response suppression time being associated with i ＆ lt inquiry；
K is that carrier aircraft monitors, at one, the c mode query sum updating transmission in interval；
K is the call number of c mode query, k=1,2,3 ... k；
Pa (k) is the power of kth time c mode query；
α is carrier aircraft target machine distributed model quantized value nearby.
2. the implementation method limiting system interrogation electromagnetic interference according to claim 1, described c mode query list refers to The summation of 4 ripple position little sound calling inquiry steppings.
3. the implementation method limiting system interrogation electromagnetic interference according to claim 1, described s mode query list refers to Inquiry in need s type order target summation.
4. the implementation method limiting system interrogation electromagnetic interference according to claim 2, before described 4 ripple positions are respectively To, left-hand, dextrad and backward.
5. the implementation method limiting system interrogation electromagnetic interference according to claim 1, during adjustment c mode query list, Sequencing is adjusted on ground or skyborne relation according to carrier aircraft, concrete method of adjustment is:
If a carrier aircraft is on ground, when needing to reduce power or reduce stepping, then to until forward direction maximum work before first adjusting Rate and left and right peak power coupling, then adjust left-hand and dextrad power, until left and right peak power and backward maximum work Rate is mated, and finally adjusts backward power again, until the backward adjustment limit；Similarly, when need increase power or increase stepping When, first adjust backward, until backward peak power is mated with left and right peak power, then adjust left and right, until left and right Peak power is mated with forward direction peak power, finally adjusts forward power again, until forward direction adjusts to the limit；
If b carrier aircraft is in the air, when need reduce power or reduce stepping when, then be sequentially adjusted in before to, left-hand, dextrad, after To so moving in circles, if certain direction adjusts extremely limiting, skipping the direction and continuing to be sequentially adjusted in；Similarly, when need When power to be increased or increase stepping, then it is sequentially adjusted in backward, dextrad, left-hand, forward direction, so moves in circles, if certain Direction adjusts and extremely limits, then skip the direction and continue to be sequentially adjusted in.
6. the implementation method limiting system interrogation electromagnetic interference according to claim 1, is carrying out s pattern and the inquiry of c pattern When asking coverage coupling, compare s pattern answering machine and traditional a/c pattern answering machine receiving sensitivity difference；If s pattern should Answer machine receiving sensitivity 3db higher than a/c pattern answering machine, then when the maximum inquiry power of c pattern is more than the maximum inquiry of s pattern Just think during more than power 3db that the inquiry coverage of c pattern has exceeded the inquiry coverage of s pattern.
7. the implementation method limiting system interrogation electromagnetic interference according to claim 5, the adjustment pole of c mode query list It is limited to: when carrier aircraft is on ground, forward direction at most reduces 10db, and left-hand and dextrad at most reduce 6db, at most reduce 1db backward；When Carrier aircraft in the air when, 4 ripple positions at most reduce 7db；The adjustment limit of s mode query list is: when carrier aircraft is on ground, at most Reduce (10+x) db；When carrier aircraft in the air when, at most reduce (7+x) db；Wherein, x refers to that s pattern answering machine receiving sensitivity is high Go out the difference of a/c pattern answering machine；No matter carrier aircraft is on ground still in the air, c mode query list and s mode query list are permitted The peak power permitted is 52dbm.
8. the implementation method limiting system interrogation electromagnetic interference according to claim 1, described c mode query list includes Conventional inquiry stepping and extra increased inquiry stepping；S mode query coverage exceedes when prewave position c mode query covering model When enclosing, corresponding ripple position increases by 1 inquiry stepping；Increased inquiry stepping is related to disturb the calculating limiting inequality, but is often not involved in The power adjustment of rule inquiry stepping；Increased stepping realization horizontal 360-degree is mated with s mode query coverage, simultaneously Form overlapping region with when prewave position c mode query coverage.
9. the implementation method limiting system interrogation electromagnetic interference according to claim 8, described overlapping region with current The little sound calling inquiry type that ripple position selects is relevant, and physical relationship is:
If a is high-precision type when the little sound calling inquiry type that prewave position selects, when when prewave position c pattern maximum inquiry work( When rate is even number, the stepping s1 pulse power of increase is as prewave position c pattern maximum inquiry power fall 1db；When prewave position c mould When formula maximum inquiry power is odd number, the stepping s1 pulse power of increase is as prewave position c pattern maximum inquiry power fall 2db；
If the little sound calling inquiry type that b works as the selection of prewave position is basic model, increased stepping s1 pulse power is current Ripple position c pattern maximum inquiry power fall 6db；
If the little sound calling inquiry type that c works as the selection of prewave position is unitary type, increased stepping s1 pulse power is 28dbm.
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