CN103199944A - Detection method and detection device of automatic dependent surveillance-broadcast - Google Patents
Detection method and detection device of automatic dependent surveillance-broadcast Download PDFInfo
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Abstract
The invention provides a detection method and a detection device of automatic dependent surveillance-broadcast. The detection method of the automatic dependent surveillance-broadcast include the steps of preprocessing, pulse position detection, preamble pulse detection, preamble reference power value calculation, and automatic dependent surveillance-broadcast (ADS-B) signal validation, wherein the preamble pulse detection includes the steps of matching and detecting pulse positions of an input signal by reading a rising edge and a falling edge of standard ADS-B signal preamble and an effective pulse position, and the ADS-B signal validation includes the steps of comparing the calculated preamble referent power value with power of each preamble pulse in the input signal, when comparison results are consistent, the input signal is confirmed as the effective ADS-B. The invention further provides a computing method which ensures effectiveness of the preamble reference power value in compliance with the minimum variance criteria. The detection method and the detection device of the ADS-B have the advantages of being high in detection probability, less in logic resource consumption, and particularly suitable for detecting an ADS-B signal by using a programmable logic device, namely a field programmable gate array (FPGA).
Description
Technical field
The present invention relates to signal detection technique.
Background technology
Monitor that (Surveillance) for air traffic control system (ATCS) provides the target real-time dynamic information of (comprising aerial airborne vehicle and airdrome scene moving-target), is the basis of carrying out air traffic control.Automatic dependent surveillance broadcast uses airborne navigational system to obtain the accurate position of aircraft and velocity information, and position and the state information of periodic broadcasting oneself, also receives the broadcast message of other aircrafts simultaneously.The Automatic dependent surveillance broadcast information in spatial domain can obtain the state of all directions aircraft on every side around the aircraft utilization, the air route of planning freely oneself; The ground surveillance station utilizes the Automatic dependent surveillance broadcast information state of flight of surveillance aircraft easily, can send various information on services simultaneously and assist the aircraft free flight.
In the following several years, the mode that the surveillance technology prize of aircarrier aircraft is combined with secondary radar from primary radar carries out the transition to the mode by surveillance radar of blank pipe, blank pipe secondary surveillance radar, automatic dependent surveillance and the work of multipoint positioning technology synergy.Fully ensure fail safe and the freedom of flight.
Utilize Automatic dependent surveillance broadcast information fast, errorless calculating aircraft position can be effectively for aircraft track planning and supervision provide support, effectively receiving the Automatic dependent surveillance broadcast signal is the basis of the normal operation of system.China's development Automatic dependent surveillance broadcast starts from 2007, and the modes of buying overseas equipment that adopt are tested construction more at present.
Summary of the invention
Technical problem to be solved by this invention is, a kind of detection probability height is provided, and sequential is simple, consumes the logical resource few signal detecting method and the device that are used for Automatic dependent surveillance broadcast ADS-B.
The present invention is that to solve the problems of the technologies described above the technical scheme that adopts be that the Automatic dependent surveillance broadcast signal detecting method may further comprise the steps:
Pre-treatment step: the DC component of filtering input signal and disturbing pulse;
Pulse position detects step: the pulse position of each pulse in the input signal after the detection preliminary treatment; Described pulse position comprises rising edge, trailing edge and effective impulse position;
Header pulse detection step: matching detection is carried out to the pulse position of input signal in rising edge, trailing edge and the effective impulse position of reading standard A DS-B signal header, when the pulse position that detects input signal and standard A DS-B signal header pulse position coupling, then think to detect ADS-B signal header in the input information;
Header reference power value calculation procedure: after the ADS-B signal header that detects coupling, choose the header reference power value that range value sampled point of the amplitude of oscillation among a small circle in the header pulse calculates input signal,
ADS-B signal authentication step: the power according to each header pulse in the header reference power value that calculates and the input signal compares, and when comparative result is unanimity, determines that then current input signal is an effective Automatic dependent surveillance broadcast signal.
Further, when in the ADS-B signal authentication step power of header pulse being compared, down link form DF verifies in also to input signal.By the header reference power value header data is carried out the power consistency detection, simultaneously the DF data are verified, determine that finally this signal is an effective Automatic dependent surveillance broadcast signal.
Concrete, described filtering interfering pulse is the wide or narrow pulse of filtering.
The concrete grammar of header reference power value is:
Extract the range value of the intermediate samples point of each pulse in the header; Described intermediate samples point is for removing the sampled point behind the rising edge and the corresponding sampled point of trailing edge in the pulse;
Calculate each intermediate samples point correspondence in the header pulse, at its number of other intermediate samples point within the amplitude of oscillation among a small circle;
Be chosen in its intermediate samples that sampling point number is maximum within amplitude of oscillation among a small circle o'clock as first reference sample point;
If first reference sample point is unique, then the range value of this first reference sample point is exactly the header reference power value;
If the first reference sample point is not unique, conduct second reference sample point of selecting range value minimum in all first reference sample points then, the intermediate samples point within the amplitude of oscillation among a small circle of the first reference sample point within the amplitude of oscillation among a small circle of the second reference sample point is averaged, the mean value that obtains is exactly the header reference power value again.
The present invention is further, utilized the middle sampling point of preamble pulse to calculate, the error of having avoided rising edge of a pulse and trailing edge that the sampling point amplitude is introduced, in addition, reject the bigger sampled point range value that floats one by one, choose the less sampled point that floats and average calculating, followed the criterion of minimum variance, guaranteed the validity of header reference power value.
The Automatic dependent surveillance broadcast signal supervisory instrument comprises:
Be used for the DC component of filtering input signal and the pretreatment module of disturbing pulse;
Pulse position detection module for detection of rising edge, trailing edge and the effective impulse position of each pulse in the input signal after the preliminary treatment;
The pulse position of input signal is carried out the header pulse detection module of matching detection for rising edge, trailing edge and the effective impulse position of reading standard A DS-B signal header, when header pulse detection module detects the pulse position of input signal and standard A DS-B signal header pulse position coupling, then think to detect ADS-B signal header in the input information;
Be used for choosing the header reference power value computing module that header pulse range value sampled point of the amplitude of oscillation among a small circle calculates the header reference power value of input signal;
The ADS-B signal authentication module that compares according to the power of each header pulse in the header reference power value that calculates and the input signal, when comparative result is unanimity, the consistency detection module determines that current input signal is an effective Automatic dependent surveillance broadcast signal.
The invention has the beneficial effects as follows, the detection probability height, sequential is simple, consumes the few advantage of logical resource, especially is fit to detect with the ADS-B signal of programmable logic device FPGA.
Description of drawings
Fig. 1 is embodiment ADS-B signal waveforms to be detected.
Fig. 2 is embodiment A DS-B signal supervisory instrument block diagram.
Fig. 3 carries out the preliminary treatment schematic diagram for the input signal of embodiment.
Fig. 4 produces flow chart for the pulse position that embodiment detects signal after the preliminary treatment.
Fig. 5 produces flow chart for the rising edge position that embodiment detects signal after the preliminary treatment.
Fig. 6 produces flow chart for the trailing edge position that embodiment detects signal after the preliminary treatment.
Fig. 7 produces schematic diagram for pulse position, rising edge position, the trailing edge position that embodiment detects signal after the preliminary treatment.
Fig. 8 is embodiment detection of preamble schematic diagram.
Embodiment
Below by accompanying drawing and example technical scheme of the present invention is done and to be described in further detail.
The ADS-B ground receiving wastewater facility mainly comprises radio-frequency module, baseband signal processing module and flight path display module.The ADS-B ground receiving wastewater facility utilizes antenna from aerial received RF ADS-B signal; Radio-frequency module is transformed to baseband signal with radiofrequency signal; Baseband signal processing module is for detection of the ADS-B signal and resolve ADS-B information; The flight path display module shows for the state informations such as position of the aircraft that parsing is obtained.Part involved in the present invention is the ADS-B signal supervisory instrument in the baseband signal processing module in the ADS-B ground receiving wastewater facility.This ADS-B signal supervisory instrument is applicable to that FPGA realizes.
Be ADS-B signal waveforms to be detected as Fig. 1, comprise ADS-B header 101, ADS-B data 202; Signal detecting method involved in the present invention mainly is to judge whether detect datagram header mates with default standard A DS-B signal header; Further, can also do further affirmation by the DF data in the ADS-B data 102.
Comprise with lower module for detection of the ADS-B signalling for the present invention as Fig. 2:
It is as follows that pretreatment module is carried out step, signal place schematic diagram as shown in Figure 3:
Input signal becomes digital signal through the sample quantization of 10MHz;
The DC component of pretreatment module filtering input signal, namely each data to input deduct a fixed value;
Filtering does not meet the data of pulse duration, it is 7 shift register REG[6:0 that signal enters width successively], signal at first enters the high position of shift register, numerical value in comparison 7 bit shift register and the size of reference amplitude, if continuous 3 width REG[2:0 in the shift register] data less than 7 width REG[6:0 in reference amplitude or the shift register] all greater than reference amplitude, then be output as 0, otherwise be output as lowest order REG[0 in the shift register].
The pulse position detection module to preliminary treatment after the detection step of input signal as follows:
Be effective impulse position probing step as Fig. 4:
To import data by shift register, obtain data P0 successively, P1, P2, P3.
Compare P0, P1, P2, the size of P3 and reference amplitude, if P0, P1, P2, P3 then export a high level greater than reference amplitude, represent that this position is an effective impulse position.
Be rising edge position probing step as Fig. 5:
To import data by shift register, obtain data P0, P1, P2, P3.
Comparison P1-P0, | the size of P2-P1| and default thresholding, if P1-P0 is greater than default thresholding, simultaneously | P2-P1| then exports a high level less than default thresholding, represents that this position is a rising edge position.
Be trailing edge position probing step as Fig. 6:
To import data by shift register, obtain data P0, P1, P2, P3.
Comparison P2-P1, | the size of P1-P0| and default thresholding, if P2-P1 is greater than default thresholding, simultaneously | P1-P0| then exports a high level less than default thresholding, represents that this position is a trailing edge position.
Import pretreated signal, output effective impulse position, rising edge, trailing edge and preprocessed signal through the signal of time-delay, output effect behind the signal process pulse position detection module as shown in Figure 7,701 for inputing to the signal of pulse position detection module, 702 is the signal from the output of pulse position detection module, 703 rising edges for the output of pulse position detection module, 704 trailing edges for the output of pulse position detection module, the 705 effective impulse positions for the output of pulse position detection module.
Whether header pulse detection module detects rising edge position, trailing edge position, effective impulse position consistent with the ADS-B signal header.If consistent, be 1 with the detection of preamble mark position then, otherwise be set to 0, as shown in Figure 8.801 primary signals for input, 802 are the digital signal to obtaining after this signal sampling quantification, the 803 rising edge positions for the generation of pulse position detection module, the 804 trailing edge positions for the generation of pulse position detection module, the 805 effective impulse positions for the generation of pulse position detection module, the detection of preamble sign that 806 rising edge position, trailing edge position and the effective impulse positions that produce according to the pulse position detection module for the detection of preamble module produce.
When behind the sample quantization of 10MHz, the sequence number of removing intermediate samples point after the rising edge, trailing edge in 4 header pulses of standard A DS-B header and be sampled point in the header is the 2nd, 3,4,12,13,14,37,38,39,47,48,49.
The treatment step of reference power value computing module is as follows:
Extract the 2nd, 3,4,12,13,14,37,38,39,47,48,49 in the header, the range value of totally 12 intermediate samples points is temporary to array head_data[12 sequentially] in;
For each intermediate samples point amplitude head_data[i] (i=1,2 ..., 12), calculate its among a small circle the amplitude of oscillation (number of ± intermediate samples point within 2dB) stores array number[i into] (and i=1,2 ..., 12) in; As, number[1] intermediate samples of the 1st intermediate samples point of record within its amplitude ± 2dB amplitude of oscillation count out, as, number[i] record the intermediate samples of i intermediate samples point within its amplitude ± 2dB amplitude of oscillation and count out;
Find out array number[i respectively] (i=1,2 ..., 12) in maximum number_max; Be chosen in its intermediate samples that sampling point number is maximum within amplitude of oscillation among a small circle o'clock as first reference sample point
(1) if array number[i] (i=1,2 ..., 12) in maximum number_max be unique, number_max is the number[j of 12 intermediate samples point j correspondences in the intermediate samples point] be number_max, so with head_data[j] be the header reference power value;
(2) if array number[i] (i=1,2 ..., 12) in maximum number_max be not unique, then with a plurality of intermediate samples of number_max correspondence o'clock as first reference sample point,
Then find out the number num of the first reference sample point, and store the range value of these first reference sample points to array max[num] in, minimum value max_min among the retrieval array max, with the intermediate samples of max_min correspondence o'clock as second reference sample point, be chosen in again intermediate samples point within the amplitude of oscillation among a small circle of the second reference sample point (since in the scope with the amplitude of no intermediate samples point less than second with reference to sampling point, this moment among a small circle the amplitude of oscillation be 0 to+2dB), soon amplitude is removed greater than the sample value of max_min2dB among the array max, and remaining range value among the array max is averaged, this mean value is exactly the header reference power value.
Claims (8)
1. the Automatic dependent surveillance broadcast signal detecting method is characterized in that, may further comprise the steps:
Pre-treatment step: the DC component of filtering input signal and disturbing pulse;
Pulse position detects step: the pulse position of each pulse in the input signal after the detection preliminary treatment, and described pulse position comprises rising edge, trailing edge and effective impulse position;
Header pulse detection step: the pulse position that reads standard A DS-B signal header is carried out matching detection to the pulse position of input signal, when the pulse position that detects input signal and standard A DS-B signal header pulse position coupling, then think to detect ADS-B signal header in the input information;
Header reference power value calculation procedure: after the ADS-B signal header that detects coupling, choose the header reference power value that range value sampled point of the amplitude of oscillation among a small circle in the header pulse calculates input signal,
ADS-B signal authentication step: the power according to each header pulse in the header reference power value that calculates and the input signal compares, and when comparative result is unanimity, determines that then current input signal is an effective Automatic dependent surveillance broadcast signal.
2. Automatic dependent surveillance broadcast signal detecting method according to claim 1, it is characterized in that, when in the ADS-B signal authentication step power of header pulse being compared, down link form DF verifies in also to input signal, pass through when comparative result is unanimity and DF checking, determine that then current input signal is an effective Automatic dependent surveillance broadcast signal.
3. Automatic dependent surveillance broadcast signal detecting method as claimed in claim 1 or 2 is characterized in that, the concrete grammar that calculates the header reference power value is:
Extract the range value of the intermediate samples point of each pulse in the header; Described intermediate samples point is for removing the sampled point behind the rising edge and the corresponding sampled point of trailing edge in the pulse;
Calculate each intermediate samples point correspondence in the header pulse at its number of the intermediate samples point within the amplitude of oscillation among a small circle;
Be chosen in its intermediate samples that sampling point number is maximum within amplitude of oscillation among a small circle o'clock as first reference sample point;
If first reference sample point is unique, then the range value of this first reference sample point is exactly the header reference power value;
If the first reference sample point is not unique, then to conduct second reference sample point of selecting range value minimum in all first reference sample points, the intermediate samples point within the amplitude of oscillation among a small circle of the first reference sample point within the amplitude of oscillation among a small circle of the second reference sample point is averaged, the mean value that obtains is exactly the header reference power value again.
4. as Automatic dependent surveillance broadcast signal detecting method as described in the claim 3, it is characterized in that the amplitude of oscillation among a small circle of the described first reference sample point is ± 2dB that the amplitude of oscillation among a small circle of the second reference sample point is+2dB.
5. Automatic dependent surveillance broadcast signal detecting method as claimed in claim 1 or 2 is characterized in that described filtering interfering pulse is the wide or narrow pulse of filtering.
6. the Automatic dependent surveillance broadcast signal supervisory instrument is characterized in that, comprising:
Be used for the DC component of filtering input signal and the pretreatment module of disturbing pulse;
Pulse position detection module for detection of the pulse position of each pulse in the input signal after the preliminary treatment; Described pulse position comprises rising edge, trailing edge and effective impulse position;
The pulse position of input signal is carried out the header pulse detection module of matching detection for the pulse position that reads standard A DS-B signal header, when header pulse detection module detects the pulse position of input signal and standard A DS-B signal header pulse position coupling, then think to detect ADS-B signal header in the input information;
Be used for choosing the header reference power value computing module that range value sampled point of the amplitude of oscillation among a small circle in the pulse of input ADS-B signal header calculates the header reference power value of input signal;
The ADS-B signal authentication module that compares according to the power of each header pulse in the header reference power value that calculates and the input signal, when comparative result is unanimity, the consistency detection module determines that current input signal is an effective Automatic dependent surveillance broadcast signal.
7. as Automatic dependent surveillance broadcast signal supervisory instrument as described in the claim 6, it is characterized in that, ADS-B signal authentication module also is used for, when the power of header pulse is compared, also down link form DF in the input signal is verified, pass through when comparative result is unanimity and DF checking, determine that then current input signal is an effective Automatic dependent surveillance broadcast signal.
8. as Automatic dependent surveillance broadcast signal supervisory instrument as described in claim 6 or 7, it is characterized in that described header reference power value computing module specifically comprises:
Be used for to extract the unit of range value of the intermediate samples point of each pulse of header; Described intermediate samples point is for removing the sampled point behind the rising edge and the corresponding sampled point of trailing edge in the pulse;
Be used for to calculate each intermediate samples point correspondence of header pulse in its unit of the number of the intermediate samples point within the amplitude of oscillation among a small circle;
Be used for being chosen in its intermediate samples that sampling point number is maximum within amplitude of oscillation among a small circle o'clock as the unit of the first reference sample point;
If first reference sample point is unique, then with the range value of the first reference sample point unit as the header reference power value;
If the first reference sample point is not unique, conduct second reference sample point of selecting range value minimum in all first reference sample points then, the intermediate samples point within the amplitude of oscillation among a small circle of the first reference sample point within the amplitude of oscillation among a small circle of the second reference sample point being averaged, is exactly the unit of header reference power value with the mean value that obtains again.
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| CN106027201A (en) * | 2016-05-06 | 2016-10-12 | 电子科技大学 | Correlation-based satellite-borne ADS-B header detection method |
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| CN104378253A (en) * | 2014-09-23 | 2015-02-25 | 北京航空航天大学 | Header locating method of S-mode acknowledgement signal in ADS-B system |
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| CN111211866A (en) * | 2019-12-27 | 2020-05-29 | 北京航空航天大学杭州创新研究院 | Novel power consistency verification method based on ADS-B |
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| CN111988115A (en) * | 2020-08-31 | 2020-11-24 | 四川九洲空管科技有限责任公司 | ADS-B distributed processing system based on parallel computing on general platform |
| 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 |
| CN114567340A (en) * | 2022-04-28 | 2022-05-31 | 成都和为时代科技有限公司 | ADS-B signal receiving baseband processing method and system based on correlation algorithm |
| CN114567340B (en) * | 2022-04-28 | 2022-07-12 | 成都和为时代科技有限公司 | ADS-B signal receiving baseband processing method and system based on correlation algorithm |
| WO2024032431A1 (en) * | 2022-08-08 | 2024-02-15 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and apparatus |
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