CN106301413A - The airborne anti-interference reception of ADS B and processing method - Google Patents
The airborne anti-interference reception of ADS B and processing method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
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Abstract
The present invention provides a kind of airborne anti-interference reception of ADS B and processing method, and the method includes: after ADS B airborne equipment receives signal, it is judged that whether signal exists superposition situation；Signal if it is not, then signal to be carried out successively dynamic threshold threshold value setting and shaping pretreatment, after acquisition process；Signal is carried out preamble pulse detection, and in the detection reference power level by rear signal calculated, then according to reference power level, signal is verified；After by checking, signal is carried out data bit extraction and confidence calculations processes, the data bit content of output signal and Data Position confidence level.The various situations that spacing wave is existed by the present invention provide fully comprehensively verification process solution, can successfully manage the problem such as interference and superposition of spacing wave, it is ensured that receive the accurate of signal.
Description
Technical field
The present invention relates to digital signal processing technique field, be specifically related to a kind of airborne anti-interference reception of ADS-B and process
Method.
Background technology
(Automatic Dependent Surveillance-Broadcast, is abbreviated as Automatic dependent surveillance broadcast
ADS-B) technology, is the airborne vehicle operation monitoring technology communicated with ground/air data link based on satellite fix, is not only successfully applied to
Long-haul aircraft without radar area monitors, and compared with traditional radar surveillance technology, ADS-B technology has use cost
The clear superiority such as low, trueness error is little, surveillance coverage is strong, the air traffic services for high density flight range also has extensively
Application prospect.
ADS-B system can be divided into airborne equipment and ground installation, current ADS-B equipment to have 3 kinds of Data-Link moulds by equipment
Formula: 1090ES pattern based on S mode, UAT pattern and VDL-4 pattern.Being suitable for relatively broad ADS-B airborne equipment at present is
The auto-correlation of a kind of 1090ES pattern based on S mode monitors equipment, generally comprises reception and sends two kinds of functions.Emission function
Refer to the form with broadcast to periphery send aircraft identification information, position, highly, speed, the information such as direction and the climb rate, prison
Air traffic situation can be monitored by receiving this information depending on equipment.Receive capabilities refers to receive the position that other airborne vehicles send
The serviced broadcast information that confidence breath or earth station send, provides operation support or periphery spatial domain to monitor for unit, safeguards flight peace
Entirely.
ADS-B airborne equipment is different from ADS-B ground receiver, owing in machine, electromagnetic environment is complicated, and the square wave to S mode
Pulse-modulated signal interference is more.It addition, ADS-B airborne equipment uses transceiver airborne antenna, so gain is less, typically
For 0dB, the coupled signal that the signal of transmitter transmitting simultaneously produces can be directly entered in receiver, when becoming receiver reception signal
Co-channel interference signal.Further, the radio-frequency cable between airborne antenna and receiver need to connect up in machine, and length is longer, enters one
Step introduces Insertion Loss, is degrading signal quality.So, it is little often to there is signal intensity in the signal that receiver is an actually-received, low noise
The problems such as signal that is big and that launch with transmitter couples so that occur that signal processing efficiency is low, the bit error rate is high further, sensitive
Spend the problems such as low.
Summary of the invention
The present invention provides a kind of airborne anti-interference reception of ADS-B and processing method, airborne to solve ADS-B in prior art
There is the problems such as the signal that signal intensity is little, low noise big and launches couples with transmitter in the signal that equipment receives.
The present invention provides a kind of airborne anti-interference reception of ADS-B and processing method, and described method includes:
After ADS-B airborne equipment receives signal, it is judged that whether described signal exists superposition situation；
Institute if it is not, then described signal to be carried out successively dynamic threshold threshold value setting and shaping pretreatment, after acquisition process
State signal；
Described signal is carried out preamble pulse detection, and in the detection reference power level by the described signal of rear calculating,
Then according to described reference power level, described signal is verified；
After by checking, described signal is carried out data bit extraction and confidence calculations processes, export described signal
Data bit content and Data Position confidence level.
As the optimal way of the present invention, if the described signal that ADS-B airborne equipment receives exists superposition situation, then root
The number of the it is believed that overlap-add procedure mechanism superposed signal to described signal and with described Signal averaging processes.
As the optimal way of the present invention, described Signal averaging treatment mechanism is the preamble pulse inspection carrying out described signal
Survey is continued until after verifying described signal, if detecting described superposed signal during preamble pulse detects
Preamble pulse, then in detection by the rear reference power level calculating described signal and described superposed signal respectively, and to institute
State signal and described superposed signal is verified；After checking, it is judged that described signal and the reference power of described superposed signal
It is pre-conditioned whether level meets, if meeting pre-conditioned, then stopping processes described signal, and is improving dynamic threshold threshold value
After, selection processes described superposed signal, otherwise, then selects to continue with described signal.
As the optimal way of the present invention, whether the described pre-conditioned reference power level for described superposed signal is than institute
State the big 3dB of reference power of signal.
As the optimal way of the present invention, described checking includes that power consistency detection, leading overlapping checking and DF position are tested
Card, described power consistency detection, described leading overlap test and the checking synchronization of described DF position are carried out.
The airborne anti-interference reception of a kind of ADS-B of present invention offer and processing method, use and arrange dynamic threshold threshold value
Mode, by changing threshold value under different conditions, can effectively suppress noise and the interference impact on signal processing；Use whole
The mode of shape pretreatment, can be adhered part and be effectively separated, reduce the error code shadow causing signal processing the bottom of signal
Ring；Use and signal is carried out the verification mode that three kinds of synchronizations are carried out, the reliability to signal detection can be improved, it is ensured that receive data
Accuracy.The various situations that spacing wave is existed by the present invention provide the most comprehensively verification process solution, can have
Effect is to problems such as the interference of spacing wave and superpositions, it is ensured that receive the accurate of signal.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
The airborne anti-interference reception of a kind of ADS-B that Fig. 1 provides for the embodiment of the present invention and the flow chart of processing method；
Fig. 2 for the embodiment of the present invention provide through the pretreated oscillogram of shaping；
Overlapping schematic diagram when Fig. 3 is 1 μ s for two signal arrival time differences that the embodiment of the present invention provides；
Overlapping schematic diagram when Fig. 4 is 3.5 μ s for two signal arrival time differences that the embodiment of the present invention provides；
Overlapping schematic diagram when Fig. 5 is 4.5 μ s for two signal arrival time differences that the embodiment of the present invention provides.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
The embodiment of the invention discloses a kind of airborne anti-interference reception of ADS-B and processing method, shown in reference Fig. 1, the party
Method includes:
After ADS-B airborne equipment receives signal, it is judged that whether signal exists superposition situation；
Signal if it is not, then signal to be carried out successively dynamic threshold threshold value setting and shaping pretreatment, after acquisition process；
Signal is carried out preamble pulse detection, and in the detection reference power level by rear signal calculated, then basis
Signal is verified by reference power level；
After by checking, signal is carried out data bit extraction and confidence calculations processes, in the data bit of output signal
Hold and Data Position confidence level.
Further, on the basis of above-described embodiment, in the method, if the signal that ADS-B airborne equipment receives is deposited
In superposition situation, then process according to the Signal averaging treatment mechanism superposed signal to signal and with this Signal averaging.Tool
Body ground, this Signal averaging treatment mechanism is that the preamble pulse detection carrying out signal is continued until this signal is verified it
After, if detecting the preamble pulse of superposed signal during preamble pulse detects, then should by rear calculating respectively in detection
Signal and the reference power level of superposed signal, and this signal and superposed signal are verified；After checking, it is judged that this letter
Number and the reference power level of superposed signal whether meet pre-conditioned, if meeting pre-conditioned, then stopping processes this signal, and
After improving dynamic threshold threshold value, selection processes superposed signal, otherwise, then selects to continue with this signal.Wherein, this default bar
Part is the reference power level 3dB bigger than the reference power of this signal of superposed signal.
In the above-described embodiment, described checking includes power consistency detection, leading overlapping checking and the checking of DF position,
Power consistency detection, leading overlap test and DF position checking these three proof procedure synchronize to carry out.
In the above-described embodiments, each processing procedure is specific as follows:
1, the setting up procedure of the dynamic threshold threshold value of signal
(1) initial threshold value is first set, it is contemplated that noise and dynamic sensitivity index, at the beginning of minimum triggering thresholding
Initial value is set as MTL=-84dbm, initial under conditions of dynamic threshold threshold value DMTL=MTL；
(2) obtained by pulse and the condition that judges, when receiving first effective impulse of signal, improve dynamic gate
Limit threshold value DMTL=MTL+8dbm, to ensure the interference judging to depart from noise of succeeding impulse and numerical value；
(3) judge unsuccessfully when 4 preamble pulse or whole 112 bit data bags receive, by dynamic threshold threshold value DMTL
Return to initial threshold MTL, i.e. DMTL=MTL；
(4) in preamble pulse processing procedure, when judging to have superposed signal, if the reference power level of superposed signal
+ the 3dbm of front signal reference power level value Ref that value Ref_over is higher than, then front signal dynamic threshold threshold value changed to
Reference power level value, i.e. DMTL=Ref_over, otherwise dynamic threshold threshold value keep constant.
2, the shaping pretreatment of signal
In the middle of actual spacing wave, along with the distance of aircraft changes, receive signal have have by force weak, it is desirable to signal
Reception can carry out quick detection process with signal magnitude.There are two kinds of general detecting ways, the detection of first AGC, the party at present
Small-signal can be amplified by method, is compressed big signal, to ensure suitable signal proportion, but this kind of mode maximum
Defect is that AGC switch speed is slow, it is impossible to adapt to the far and near airborne signal of reception is switched fast problem；Another mode is to use
Logarithmic detector mode, which adapts to be switched fast problem, but defect is when signal is bigger, and the bottom of rectified signal can be produced
Life is adhered, and causes the bit error rate of data message to increase.
ADS-B airborne equipment in the present invention have employed the processing mode of logarithmic detector at present, for the end of rectified signal
It is that rectified signal is carried out shaping pretreatment that portion is adhered the measure that problem taked.
Its concrete processing procedure is as follows:
(1) by sampled value S of AD analog-digital converter, under the triggering of sampling clock, 5 internal registers it are sequentially stored into (i.e.
P1≤S；P2≤P；P3≤P2；P4≤P3；P5≤P4).P1 represents up-to-date sampled value, and P2, P3, P4, P5 represent successively
The sampled value in 4 Geju City before；
(2) value P1 of 5 depositors, P2, P3, P4, P5 are compared with dynamic threshold threshold value DMTL, meet when simultaneously
P1, P2, P3, P4 are more than dynamic threshold threshold value, and P5 is less than (P1 > the DMTL during condition of dynamic threshold threshold value；P2>DMTL；P3
>DMTL；P4>DMTL；P5 < DMTL), find out maximum PMAX in these 4 values of P1, P2, P3, P4 (i.e. PMAX≤MAX (P1,
P2, P3, P4)), enter (3rd) step；Otherwise continue executing with (2nd) step.
(3) the maximum PMAX that (2nd) step obtains is deducted a 400mv numerical value, when (PMAX-400mv numerical value) > DMTL
Time, using this value as shaping thresholding ZT=PMAX-400mv numerical value；As (PMAX-400mv numerical value)≤DMTL, by dynamic gate
Limit as shaping thresholding ZT=DMTL (numerical value of note: 400mv is based on the experience value that measured waveform obtains).When getting
During new PMAX, update ZT, otherwise keep shaping thresholding ZT value constant；
(4) by the numerical value of depositor P5, under the triggering of sampling clock, compare with shaping threshold value ZT successively, will be less than
The value of ZT is set to 0, and the value that will be greater than ZT retains initial value, using the data after this group shaping as follow-up process sampled data
Si, reaches to reject the purpose being adhered waveform with this.Waveform after shaping is as shown in Figure 2.
3, the preamble pulse detection of signal
Determine whether that pulse needs two conditions: a rising edge (i.e. later sampled point being intended to pulse
It is greater than threshold value) with the difference of previous sampled point；Another is intended to possess pulse position (i.e. company including rising edge
The amplitude of continuous four sampled points will be more than dynamic threshold threshold value DMTL set), meet the existence of the two condition stub and determine
A pulse.
The preamble pulse of signal is made up of 4 pulses, when the time point at 0us, 1us, 3.5us, 4.5us rising edge of a pulse
Upper existence meets the decision condition of individual pulse, then detected by preamble pulse.Specifically comprise the following steps that
(1) first arranging the time counter Count_Win of 4 preamble pulse, the counting cycle is 5us, is used for recording arteries and veins
Go out existing time location；
(2) using data Si after shaping as the sampled data of subsequent treatment, Si is stored in successively rising edge and judges to post
Storage Edge_buf1≤Si；Edge_buf2≤Edge_buf1；And pulse position judges depositor Vpp_buf1≤Si；
Vpp_buf2≤Vpp_buf1；Vpp_buf3≤Vpp_buf2；Vpp_buf4≤Vpp_buf3；
(3) at each count value Count_Win_i of Count_Win rolling counters forward, it is determined that whether rising edge is deposited
?.Working as Edge_buf1 > 2*Edge_buf2 and Edge_buf1 > DMTL then arrange rising edge indication position Edge_flag_i=' 1 '；
Rising edge indication position Edge_flag_i=' 0 ' is otherwise set；
(4) at each count value Count_Win_i of Count_Win rolling counters forward, it is determined that whether pulse position
Exist.Work as Vpp_buf1 > DMTL, Vpp_buf2 > DMTL, Vpp_buf3 > DMTL, Vpp_buf4 > DMTL is when meeting simultaneously, then sets
Put pulse position and there is flag bit Vpp_flag_i=' 1 '；Pulse position is otherwise set and there is flag bit Vpp_flag_i=
‘0’；
(5) in preamble pulse detection procedure, when enumerator Count_Win record time 0us, 1us, 3.5us,
There is rising edge indication and the pulse position mark, i.e. Edge_flag_00=of pulse in the middle of the flag register of 4.5us simultaneously
' 1 ', Edge_flag_10=' 1 ', Edge_flag_35=' 1 ', Edge_flag_45=' 1 ' and Vpp_flag_00=' 1 ',
Vpp_flag_10=' 1 ', Vpp_flag_35=' 1 ', Vpp_flag_45=' 1 ' then represents and has passed through preamble pulse detection, if
Put 4 pulses and obtain sign of flag _ 4P_Got=' 1 ', the most not by detection, Flag_4P_Got=' 0 '.
4, the reference power level of signal calculated
(1) choose 3 sampled points after 4 each rising edges of preamble pulse, 12 points altogether, be designated as Si (i=1,
2 ... 12), from these are put, generation reference power level value is calculated；
(2) to each sampled point in 12 sampled points, calculate this point ± 1dB value, then investigate other sampled points and exist
Number in the range of this sampling point value ± 1dB, the maximum of statistics numbers, if the maximum of this number is unique, then just
Sampled point corresponding to this number maximum will be produced as final reference power level Ref；
(3), when the sampled point corresponding to maximum number in the range of statistics ± 1dB is no less than 2, number is less than
The sampled point of maximum abandons, and finds the sampled point that minima is corresponding, calculate corresponding to its+2dB in remaining sampled point
Value, gives up more than its+2dB sampled point, finally the level value of residue sampled point is calculated meansigma methods, as final reference power
Level Ref.
After having calculated reference power level, enter into the checking interlude of three conditions of signal, i.e. synchronize to carry out power
Consistency detection, leading overlap test, the checking of DF position.
5, power consistency detection
Power consistency detection is exactly that the average power content by each preamble pulse compares with reference power level value, investigates
Whether signal waveform there is uneven situation, if comparative result determines this situation of appearance, then assert that signal is by dry
Disturb relatively big, subsequent treatment difficulty, then abandon this signal, reenter preamble pulse detection.Specifically comprise the following steps that
(1) meansigma methods of 4 sampled points after each preamble pulse rising edge is calculated；
(2) meansigma methods of each preamble pulse and the difference of reference power level value are compared, if at least 2 pulses are simultaneously full
Foot difference reference power level value ± 3dB in, then by power consistency detection, otherwise abandon this signal, reenter
Preamble pulse detects.
6, leading overlap test
In a practical situation, often occur in supervision spatial domain and the situation that multiple ADS-B aircraft is broadcasted simultaneously occurs, by
Communicate with air-air in Air-Ground communication frequently, will cause recipient two kinds of situations occurring: the overlap of (1) header, i.e. before and after
The preamble pulse location overlap of two different messages, if taken no action to, will be unable to Correct Analysis two message；(2) excessively frequently
Numerous message receives, although message is the most overlapping, but owing to receiving the most frequently and processing, will seriously test the process speed of DSP
Degree, the data frequently interrupting DSP are also processed by too much interruption.
When, under target overlapping cases, system understands the nearer target broadcast of priority treatment signal distance receiver, preferentially locates
The broadcast message that reason signal amplitude is bigger.The present invention use leading overlap test overlapping message is carried out preamble pulse separation
And parsing.And to frequently receiving form, use overlapping and neighbouring principle that message is accepted or rejected.
When two Mode S messages interweave (message intersects) at receiving terminal, in fact it could happen that the overlap (pulse code of part
Overlap) and completely overlapped, use the decision algorithm of sampled point to process, set forth below is three kinds of completely overlapped feelings of pulse
Condition, the algorithm that partly overlaps equally is as completely overlapped, and result is the most identical.
The situation that the preamble pulse of signal is completely overlapped has following several possible:
A, two signal arrival time differences are 1 μ s, and a rear bars amplitude is relatively strong, as shown in Figure 3.
B, two signal arrival time differences are 3.5 μ s, and a rear bars amplitude is relatively strong, as shown in Figure 4.
C, two signal arrival time differences are 4.5 μ s, and a rear bars amplitude is relatively strong, as shown in Figure 5.
Corresponding leading overlap test is divided into three kinds, 1 μ s examination, 3.5 μ s tests, 4.5 μ s tests.
(1) 1 μ s test: in order to solve this problem, preamble pulse detect after next step time detection in initial time
After 1.0,2.0,4.5,5.5 μ s pulse positions on whether have extra power.For these pulse positions, each with one
Sampled point estimates the power in that pulse at that time.Adopt if T=0 is first after first preamble pulse rising edge
The time of sampling point, then the power of 4 preamble pulse just can be estimated by the sampled point of T=1.0,2.0,4.5 and 5.5 μ s respectively
Meter.Find out minimum M inSi of these 4 performance numbers, carry out with the maximum power value MaxSj of T=0 and 3.5 two sampled points of μ s
Relatively: if MaxSj-MinSi≤-3dB, then would abandon first preamble pulse pre_num, select second preamble pulse
Pre_num+1, and make num+1 into num, i.e. num:=num+1；If MaxSj-MinSi >-3dB, then enter next step
3.5 μ s tests.
(2) 3.5 μ s detection: with a similar process detect whether one than pre_num the strong signal of late 3.5 μ s
Pre_num+1 overlaps.Take minimal power values MinSi of T=3.5,4.5,7.0,8.0 μ s sampling point and T=0,1.0 μ s
High-power value MaxSj compares, if MaxSj-MinSi≤-3dB, then would abandon first preamble pulse pre_num, choosing
Select second preamble pulse pre_num+1, and make num+1 into num, i.e. num:=num+1.Otherwise, next step 4.5 μ s is entered
Test.
(3) 4.5 μ s detections: a similar detection detects whether the strong signal of the late 4.5 μ s of a ratio first
Overlapping, the maximum power value of the minimal power values and T=0,1.0,3.5 μ s that take T=4.5,5.5,8.0,9.0 μ s sampling point enters
Row compares, if MaxSj-MinSi≤-3dB, then would abandon this first preamble pulse.Otherwise, select this preamble pulse,
Enter next step power uniformity test.
(4) heavily trigger: after a preamble pulse being detected, by overlap test and DF certification described below and power one
After the detection of cause property, in 13 μ s, continually look for preamble pulse, if this preamble pulse is again by above-mentioned all tests.By it
Preamble pulse reference value present preamble pulse reference frame angle value compare.If this new signal is than old signal amplitude extremely
Few high 3dB, then abandon old signal, processes new signal.Otherwise, ignore new signal, continue with old signal.
7, the DF position checking of signal
DF information is made up of 5 bit data positions, and it represents the header information type of these group data, 5 bit data of reception with
The required data type received is consistent, then it represents that is verified by DF, carries out the reception of subsequent data signal, otherwise gives up this group letter
Number, reenter preamble pulse detection, carry out new one group of signal and receive.Specifically comprise the following steps that
(1) according to the decision condition of pulse active position, 5 code pulse correspondences residing for DF are determined by sampled data
Position whether there is pulse position.If there is then access, next step calculates, and otherwise restarts the detection of preamble pulse；
(2) use 3 sampled points after the rising edge of 5 pulses in DF position, obtain each pulse respectively and select 3 points
Meansigma methods；
(3) the reference power level value of the meansigma methods obtained and preamble pulse is compared, if each code pulse is flat
Average all reference power level ± 3dB in the range of then verified by DF, otherwise abandon this header and restart preamble pulse
Detection.
8, processing data information is received
When the data waveform of sampling is by three conditions such as power consistency detection, leading overlap test, the checkings of DF position
After checking, enter into the receiving process of Plane location data message.Specifically comprise the following steps that
(1) 10 sampled points of each data bit are respectively labeled as S1～S10, the first half of data and later half
Part is respectively labeled as chip1, chip2；
(2) find out respectively in chip1 and chip2 with sampled point in the range of ± 3dB of the difference of reference power level value；
Determine the sampled point of 6dB lower than reference power level value in chip1 and chip2 again.
(3) weighting respectively according to the position of sampled point, the edge sample points in chip1 and chip2 takes advantage of 1, middle 3 samplings
Dot product 2 (that is, weighted value is respectively as follows: 1,2,2,2,1)
(4) during counting, sampled point is divided into 4 classes: (A represents that sampled point is in the range of ± 3dB；B represents that sampled point is than with reference to merit
The low 6dB of rate level value；The 1 front 0.5us representing data；The 0 rear 0.5us representing data), it is respectively labeled as A1, B0,
A0, B1.
A1: represent before 1 data in 0.5us ± 3dB in the range of the weighted value of sampled data；
A0: represent after 1 data in 0.5us ± 3dB in the range of the weighted value of sampled data；
B1: be less than the weighted value of the sampled data of 6dB before representing 1 data in 0.5us；
B0: be less than the weighted value of the sampled data of 6dB after representing 1 data in 0.5us.
(5) then calculating two accumulated values, S1 is to weigh the matching degree with ideal data " 1 ", and S0 is for weighing with preferable
The matching degree of data " 0 ".
S1=A1-A0+B0-B1；
S0=A0-A1+B1-B0；
(6) compare the size of S1 and S0, numerical value big as judging to receive a data as " 1 " or the output of " 0 ".
(7) according to the decision algorithm of reception data above, persistently receiving data below is=position, until 112
ADS-B data message receives, and reenters the judgement step of preamble pulse, starts judgement and the reception of new one group of data.
The various situations that spacing wave is existed by the present invention provide the most comprehensively verification process solution, can be effective
The problems such as the interference of reply spacing wave and superposition, it is ensured that receive the accurate of signal.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (5)
1. the airborne anti-interference reception of ADS-B and processing method, it is characterised in that described method includes:
After ADS-B airborne equipment receives signal, it is judged that whether described signal exists superposition situation；
Described letter if it is not, then described signal to be carried out successively dynamic threshold threshold value setting and shaping pretreatment, after acquisition process
Number；
Described signal is carried out preamble pulse detection, and in the detection reference power level by the described signal of rear calculating, then
According to described reference power level, described signal is verified；
After by checking, described signal is carried out data bit extraction and confidence calculations processes, export the data of described signal
Position content and Data Position confidence level.
Method the most according to claim 1, it is characterised in that if the described signal that ADS-B airborne equipment receives exists
Superposition situation, then according to Signal averaging treatment mechanism to described signal and with the superposed signal of described Signal averaging at
Reason.
Method the most according to claim 2, it is characterised in that described Signal averaging treatment mechanism is for carry out described signal
Preamble pulse detection be continued until described signal verified after, if detecting during preamble pulse detects
The preamble pulse of described superposed signal, then in detection by the rear reference power calculating described signal and described superposed signal respectively
Level, and described signal and described superposed signal are verified；After checking, it is judged that described signal and described superposed signal
Reference power level whether meet pre-conditioned, if meeting pre-conditioned, then stopping processes described signal, and is improving dynamically
After threshold value, selection processes described superposed signal, otherwise, then selects to continue with described signal.
Method the most according to claim 3, it is characterised in that the described pre-conditioned reference power for described superposed signal
Level 3dB bigger than the reference power of described signal.
Method the most according to any one of claim 1 to 4, it is characterised in that described checking includes that power concordance is examined
Survey, leading overlapping checking and the checking of DF position, described power consistency detection, described leading overlap test and the checking of described DF position are same
Step is carried out.
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| CN108322412A (en) * | 2018-01-31 | 2018-07-24 | 四川九洲电器集团有限责任公司 | A kind of improved ADS-B method for receiving and processing signal |
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| CN108737030A (en) * | 2018-05-17 | 2018-11-02 | 中国电子科技集团公司第五十四研究所 | A kind of ADS-B signal muting sensitivity method of reseptances based on spaceborne scene |
| CN108737030B (en) * | 2018-05-17 | 2020-12-15 | 中国电子科技集团公司第五十四研究所 | ADS-B signal low-sensitivity receiving method based on satellite-borne scene |
| CN108957503A (en) * | 2018-06-08 | 2018-12-07 | 南京航空航天大学 | Positioning and false target recognition methods based on ADS-B message step-by-step counting |
| CN108957503B (en) * | 2018-06-08 | 2022-07-26 | 南京航空航天大学 | Positioning and false target identification method based on ADS-B message pulse counting |
| CN110780267A (en) * | 2019-10-31 | 2020-02-11 | 四川九洲空管科技有限责任公司 | Self-checking method for receiving and transmitting channel of navigation management inquiry response simulator |
| CN110780267B (en) * | 2019-10-31 | 2021-06-11 | 四川九洲空管科技有限责任公司 | Self-checking method for receiving and transmitting channel of navigation management inquiry response simulator |
| CN111896920A (en) * | 2020-05-27 | 2020-11-06 | 上海航天计算机技术研究所 | AD 9361-based configuration method for satellite-borne ADS-B load |
| WO2021259118A1 (en) * | 2020-06-24 | 2021-12-30 | 华为技术有限公司 | Method and apparatus for calibrating bit error rate floor |
| CN112444807A (en) * | 2021-01-29 | 2021-03-05 | 成都能通科技有限公司 | Multi-target anti-interference positioning method based on secondary radar arrival time |
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