CN103199944B - automatic dependent surveillance broadcast signal detecting method and device - Google Patents
automatic dependent surveillance broadcast signal detecting method and device Download PDFInfo
- Publication number
- CN103199944B CN103199944B CN201310049977.8A CN201310049977A CN103199944B CN 103199944 B CN103199944 B CN 103199944B CN 201310049977 A CN201310049977 A CN 201310049977A CN 103199944 B CN103199944 B CN 103199944B
- Authority
- CN
- China
- Prior art keywords
- header
- pulse
- signal
- point
- input signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a kind of Automatic dependent surveillance broadcast signal detecting method and device, comprising: pre-treatment step; Pulse position detecting step; Header pulse detection step: read the rising edge of standard A DS-B signal header, trailing edge and effective impulse position and matching detection is carried out to the pulse position of input signal; Header reference power value calculation procedure; ADS-B signal authentication step: the power according to header pulse each in the header reference power value calculated and input signal compares, when comparative result is unanimously, then determines that current input signal is an effective Automatic dependent surveillance broadcast signal.Further, invention also provides a kind of computational methods that ensure that the validity of header reference power value that have followed the criterion of minimum variance.Detection probability of the present invention is high, consumes logical resource few, is especially applicable to detecting ADS-B signal with programmable logic device FPGA.
Description
Technical field
The present invention relates to signal detection technique.
Background technology
Monitoring that (Surveillance) provides the real-time dynamic information of target (comprising aerial airborne vehicle and airdrome scene moving-target) for air traffic control system (ATCS), 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 the position of periodically broadcast oneself and state information, also receive the broadcast message of other aircrafts simultaneously.Aircraft utilizes the Automatic dependent surveillance broadcast information of ambient airspace can obtain the state of all directions aircraft around, plans the air route of oneself freely; Ground surveillance station utilizes Automatic dependent surveillance broadcast information can monitor the state of flight of aircraft easily, can send various information on services to assist aircraft free flight simultaneously.
In forthcoming years, the prize of the surveillance technology of aircarrier aircraft is transitioned into by the mode of blank pipe surveillance radar, blank pipe secondary surveillance radar, automatic dependent surveillance and the work of multipoint positioning technology synergy from the mode that primary radar is combined with secondary radar.Abundant fail safe and the freedom ensureing flight.
Utilize Automatic dependent surveillance broadcast information fast, errorless calculating aircraft position can effectively for aircraft track planning and supervision provide support, it is effective that to receive Automatic dependent surveillance broadcast signal be the basis that system is normally run.China's development Automatic dependent surveillance broadcast starts from 2007, and the mode buying overseas equipment that adopts carries out test construction more at present.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of detection probability high, and sequential is simple, consumes the few signal detecting method for Automatic dependent surveillance broadcast ADS-B of logical resource and device.
The present invention is that Automatic dependent surveillance broadcast signal detecting method, comprises the following steps for solving the problems of the technologies described above adopted technical scheme:
Pre-treatment step: the DC component of filtering input signal and disturbing pulse;
Pulse position detecting step: the pulse position of each pulse in input signal after detection preliminary treatment; Described pulse position comprises rising edge, trailing edge and effective impulse position;
Header pulse detection step: read the rising edge of standard A DS-B signal header, trailing edge and effective impulse position and matching detection is carried out to the pulse position of input signal, when detecting that the pulse position of input signal is mated with standard A DS-B signal header pulse position, then think the ADS-B signal header detected in input information;
Header reference power value calculation procedure: when after the ADS-B signal header detecting coupling, the sampled point choosing range value amplitude of oscillation among a small circle in header pulse calculates the header reference power value of input signal,
ADS-B signal authentication step: the power according to header pulse each in the header reference power value calculated and input signal compares, when comparative result is unanimously, then determines that current input signal is an effective Automatic dependent surveillance broadcast signal.
Further, while comparing the power of header pulse in ADS-B signal authentication step, down link form DF verifies in also to input signal.By header reference power value, power consistency detection is carried out to header data, DF data are verified simultaneously, finally determine that 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 header; Described intermediate samples point is remove the sampled point in pulse after rising edge and the corresponding sampled point of trailing edge;
Calculate each intermediate samples point in header pulse corresponding, the number of other intermediate samples point within its among a small circle amplitude of oscillation;
Select sampling point number is maximum within its among a small circle amplitude of oscillation intermediate samples o'clock as the first reference sample point;
If the first reference sample point is unique, then the range value of this first reference sample point is exactly header reference power value;
If the first reference sample point is not unique, the conduct second reference sample point that then selecting range value is minimum in all first reference sample points, be averaged to the intermediate samples point within the amplitude of oscillation among a small circle of the second reference sample point, the mean value obtained is exactly header reference power value again.
The present invention is further, the middle sampling point that make use of preamble pulse calculates, avoid the error that rising edge of a pulse and trailing edge are introduced sampling point amplitude, in addition, successively reject larger sample amplitude value of floating, choose the less sampled point that floats to be averaged calculating, have followed the criterion of minimum variance, ensure that the validity of header reference power value.
Automatic dependent surveillance broadcast signal supervisory instrument, comprising:
For the DC component of filtering input signal and the pretreatment module of disturbing pulse;
For detecting the pulse position detection module of the rising edge of each pulse in input signal after preliminary treatment, trailing edge and effective impulse position;
For reading the rising edge of standard A DS-B signal header, trailing edge and effective impulse position, the header pulse detection module of matching detection is carried out to the pulse position of input signal, when header pulse detection module detects that the pulse position of input signal is mated with standard A DS-B signal header pulse position, then think the ADS-B signal header detected in input information;
The header reference power value computing module of the header reference power value of input signal is calculated for choosing the sampled point of the amplitude of oscillation among a small circle of range value in header pulse;
According to the ADS-B signal authentication module that the power of header pulse each in the header reference power value calculated and input signal compares, when comparative result is unanimously, consistency detection module determination current input signal is an effective Automatic dependent surveillance broadcast signal.
The invention has the beneficial effects as follows, detection probability is high, and sequential is simple, consumes the advantage that logical resource is few, is especially applicable to detecting ADS-B signal with programmable logic device FPGA.
Accompanying drawing explanation
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 is that embodiment carries out preliminary treatment schematic diagram to input signal.
Fig. 4 is that after embodiment detects preliminary treatment, the pulse position of signal produces flow chart.
Fig. 5 is that after embodiment detects preliminary treatment, the leading edge position of signal produces flow chart.
Fig. 6 is that after embodiment detects preliminary treatment, the trailing edge position of signal produces flow chart.
Fig. 7 is pulse position, leading edge position, the trailing edge position generation schematic diagram of signal after embodiment detection 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 described in further detail.
ADS-B ground receiving wastewater facility mainly comprises radio-frequency module, baseband signal processing module and Target track displaying module.ADS-B ground receiving wastewater facility utilizes antenna from aerial received RF ADS-B signal; Radiofrequency signal is transformed to baseband signal by radio-frequency module; Baseband signal processing module is for detecting ADS-B signal and resolving ADS-B information; Target track displaying module is used for showing state informations such as the positions of resolving the aircraft obtained.Part involved in the present invention is the ADS-B signal supervisory instrument in ADS-B ground receiving wastewater facility in baseband signal processing module.This ADS-B signal supervisory instrument is applicable to FPGA and realizes.
If Fig. 1 is ADS-B signal waveforms to be detected, comprise ADS-B header 101, ADS-B data 202; Signal detecting method involved in the present invention mainly judges whether detect datagram header mates with the standard A DS-B signal header preset; Further, further confirmation can also be done by the DF data in ADS-B data 102.
If Fig. 2 is that the present invention comprises with lower module for detecting ADS-B signalling:
Module 201 is pretreatment module, for carrying out preliminary treatment to input signal, comprises the DC component of filtering input signal, the pulse that filtering is wide, narrow.
Module 202 is pulse position detection module, detects the pulse position of each pulse in input signal after preliminary treatment, and pulse position comprises the pulse position of the rising edge of pulse, trailing edge and effective impulse position.
Module 203 comprises header pulse detection module, reference power value computing module, the pulse position that pulse position detection module is used for the accurate ADS-B signal header of label taking carries out matching detection to the pulse position of input signal, when detecting that the pulse position of input signal is mated with standard A DS-B signal header pulse position, then think the ADS-B signal header detected in input information; Reference power value computing module is for calculating the reference power value of the header of input signal.
Module 204 is ADS-B signal authentication module, for by judging requirement that whether DF numerical value meet Automatic dependent surveillance broadcast signal and judging that whether all pulses of header are consistent with reference power value and determine current input signal whether as an effective ADS-B signal.
It is as follows that pretreatment module carries out step, signal place schematic diagram as shown in Figure 3:
Input signal, through the sample quantization of 10MHz, becomes digital signal;
The DC component of pretreatment module filtering input signal, namely deducts a fixed value to each data of input;
Filtering does not meet the data of pulse duration, signal enters the shift register REG [6:0] that width is 7 successively, first signal enters a high position for shift register, numerical value relatively in 7 bit shift register and the size of reference amplitude, if the data of continuous 3 width REG [2:0] are less than 7 width REG [6:0] in reference amplitude or shift register and are all greater than reference amplitude in shift register, then exporting is 0, otherwise exports as lowest order REG [0] in shift register.
Pulse position detection module is as follows to the detecting step of input signal after preliminary treatment:
If Fig. 4 is effective impulse position probing step:
Data will be inputted by shift register, obtain data P0 successively, P1, P2, P3.
The relatively size of P0, P1, P2, P3 and reference amplitude, if P0, P1, P2, P3 are greater than reference amplitude, then export a high level, represents that this position is an effective impulse position.
If Fig. 5 is leading edge position detecting step:
Data will be inputted by shift register, obtain data P0, P1, P2, P3.
Comparison P1-P0, | the size of P2-P1| and pre-determined threshold, if P1-P0 is greater than pre-determined threshold, simultaneously | P2-P1| is less than pre-determined threshold, then export a high level, represent that this position is a leading edge position.
If Fig. 6 is trailing edge position probing step:
Data will be inputted by shift register, obtain data P0, P1, P2, P3.
Comparison P2-P1, | the size of P1-P0| and pre-determined threshold, if P2-P1 is greater than pre-determined threshold, simultaneously | P1-P0| is less than pre-determined threshold, then export a high level, represent that this position is a trailing edge position.
Input pretreated signal, export effective impulse position, rising edge, trailing edge and the preprocessed signal signal through time delay, the output effect of signal after pulse position detection module as shown in Figure 7,701 for inputing to the signal of pulse position detection module, 702 is the signal exported from pulse position detection module, 703 rising edges exported for pulse position detection module, 704 trailing edges exported for pulse position detection module, the 705 effective impulse positions exported for pulse position detection module.
Header pulse detection module detects leading edge position, whether trailing edge position, effective impulse position be consistent with ADS-B signal header.If consistent, be then 1 by detection of preamble mark position, otherwise be set to 0, as shown in Figure 8.801 is the primary signal inputted, 802 is the digital signal obtained after quantizing this signal sampling, 803 leading edge position produced for pulse position detection module, the 804 trailing edge positions produced for pulse position detection module, the 805 effective impulse positions produced for pulse position detection module, the detection of preamble mark that 806 leading edge position produced according to pulse position detection module for detection of preamble module, trailing edge position and effective impulse position produce.
When after the sample quantization of 10MHz, the intermediate samples point removed in 4 header pulses of standard A DS-B header after rising edge, trailing edge is the sequence number of sampled point in 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 header, the range value of totally 12 intermediate samples points, keeps in array head_data [12] sequentially;
For each intermediate samples point amplitude head_data [i] (i=1,2 ... 12), calculate the number of the intermediate samples point within its among a small circle amplitude of oscillation (± 2dB), be stored into array number [i] (i=1,2 ..., 12) in; As, number [1] records the intermediate samples of the 1st intermediate samples point within its amplitude ± 2dB amplitude of oscillation and counts out, and e.g., number [i] records the intermediate samples of i-th intermediate samples point within its amplitude ± 2dB amplitude of oscillation and counts out;
Find out respectively array number [i] (i=1,2 ..., 12) in maximum number_max; Select sampling point number is maximum within its among a small circle amplitude of oscillation intermediate samples o'clock as the first reference sample point
(1) if array number [i] (i=1,2,12) the maximum number_max in is unique, number_max is the number [j] that the intermediate samples point j in 12 intermediate samples points is corresponding is number_max, so with head_data [j] for header reference power value;
(2) if array number [i] (i=1,2 ..., 12) in maximum number_max be not unique, then using multiple intermediate samples corresponding for number_max o'clock as the first reference sample point,
Then find out the number num of the first reference sample point, and store the range value of these the first reference sample points in array max [num], minimum value max_min in retrieval array max, using intermediate samples corresponding for max_min o'clock as the second reference sample point, select again the intermediate samples point within the amplitude of oscillation among a small circle of the second reference sample point (due in scope to be less than second without the amplitude of intermediate samples point with reference to sampling point, now the amplitude of oscillation is 0 to+2dB among a small circle), the sample value being greater than max_min2dB by amplitude in array max is removed, and range value remaining in array max is averaged, this mean value is exactly header reference power value.
Claims (4)
1. Automatic dependent surveillance broadcast signal detecting method, is characterized in that, comprises the following steps:
Pre-treatment step: the DC component of filtering input signal and disturbing pulse;
Pulse position detecting step: the pulse position of each pulse in input signal after detection preliminary treatment, described pulse position comprises rising edge, trailing edge and effective impulse position;
Header pulse detection step: the pulse position reading standard A DS-B signal header carries out matching detection to the pulse position of input signal, when detecting that the pulse position of input signal is mated with standard A DS-B signal header pulse position, then think the ADS-B signal header detected in input information;
Header reference power value calculation procedure: when after the ADS-B signal header detecting coupling, the sampled point choosing range value amplitude of oscillation among a small circle in header pulse calculates the header reference power value of input signal, and the concrete grammar calculating header reference power value is:
Extract the range value of the intermediate samples point of each pulse in header; Described intermediate samples point is remove the sampled point in pulse after rising edge and the corresponding sampled point of trailing edge;
Calculate the number of the point of the intermediate samples within its among a small circle amplitude of oscillation that each intermediate samples point is corresponding in header pulse;
Select sampling point number is maximum within its among a small circle amplitude of oscillation intermediate samples o'clock as the first reference sample point;
If the first reference sample point is unique, then the range value of this first reference sample point is exactly header reference power value;
If the first reference sample point is not unique, then to the conduct second reference sample point that selecting range value in all first reference sample points is minimum, be averaged to the intermediate samples point within the amplitude of oscillation among a small circle of the second reference sample point, the mean value obtained is exactly header reference power value again;
ADS-B signal authentication step: the power according to header pulse each in the header reference power value calculated and input signal compares, simultaneously, down link form DF verifies in also to input signal, be verified when comparative result is consistent and DF, then determine that current input signal is an effective Automatic dependent surveillance broadcast signal.
2. Automatic dependent surveillance broadcast signal detecting method as claimed in claim 1, it is characterized in that, the amplitude of oscillation among a small circle of described first reference sample point is ± 2dB, and the amplitude of oscillation among a small circle of the second reference sample point is+2dB.
3. Automatic dependent surveillance broadcast signal detecting method as claimed in claim 2, is characterized in that, described filtering interfering pulse is the wide or narrow pulse of filtering.
4. Automatic dependent surveillance broadcast signal supervisory instrument, is characterized in that, comprising:
For the DC component of filtering input signal and the pretreatment module of disturbing pulse;
For detecting the pulse position detection module of the pulse position of each pulse in input signal after preliminary treatment; Described pulse position comprises rising edge, trailing edge and effective impulse position;
Pulse position for reading standard A DS-B signal header to carry out the header pulse detection module of matching detection to the pulse position of input signal, when header pulse detection module detects that the pulse position of input signal is mated with standard A DS-B signal header pulse position, then think the ADS-B signal header detected in input information;
The header reference power value computing module of the header reference power value of input signal is calculated for choosing in input ADS-B signal the sampled point of the amplitude of oscillation among a small circle of range value in header pulse;
According to the ADS-B signal authentication module that the power of header pulse each in the header reference power value calculated and input signal compares, while the power of header pulse is compared, also down link form DF in input signal is verified, be verified when comparative result is consistent and DF, consistency detection module determination current input signal is an effective Automatic dependent surveillance broadcast signal;
Described header reference power value computing module specifically comprises:
For extracting the unit of the range value of the intermediate samples point of each pulse in header; Described intermediate samples point is remove the sampled point in pulse after rising edge and the corresponding sampled point of trailing edge;
For calculating the unit of the number of the point of the intermediate samples within its among a small circle amplitude of oscillation that each intermediate samples point is corresponding in header pulse;
For selecting sampling point number is maximum within its among a small circle amplitude of oscillation intermediate samples o'clock as the unit of the first reference sample point;
If the first reference sample point is unique, then using the range value of the first reference sample point as the unit of header reference power value;
If the first reference sample point is not unique, the conduct second reference sample point that then selecting range value is minimum in all first reference sample points, being averaged to the intermediate samples point within the amplitude of oscillation among a small circle of the second reference sample point, is exactly the unit of header reference power value with the mean value obtained again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310049977.8A CN103199944B (en) | 2013-02-07 | 2013-02-07 | automatic dependent surveillance broadcast signal detecting method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310049977.8A CN103199944B (en) | 2013-02-07 | 2013-02-07 | automatic dependent surveillance broadcast signal detecting method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103199944A CN103199944A (en) | 2013-07-10 |
| CN103199944B true CN103199944B (en) | 2016-03-30 |
Family
ID=48722320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310049977.8A Expired - Fee Related CN103199944B (en) | 2013-02-07 | 2013-02-07 | automatic dependent surveillance broadcast signal detecting method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103199944B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253721B (en) * | 2014-09-23 | 2017-10-03 | 北京航空航天大学 | A kind of data bit extraction method of S mode answer signal in ADS B systems |
| CN104378253B (en) * | 2014-09-23 | 2018-02-13 | 北京航空航天大学 | The header localization method of S mode answer signal in a kind of ADS B systems |
| CN106027201B (en) * | 2016-05-06 | 2019-07-02 | 电子科技大学 | Based on relevant spaceborne ADS-B detection of preamble method |
| CN106100786A (en) * | 2016-05-27 | 2016-11-09 | 电子科技大学 | A kind of spaceborne ADS B detection of preamble method relevant based on header entirety |
| CN106154080B (en) * | 2016-06-17 | 2019-03-08 | 中国电子科技集团公司第二十八研究所 | A kind of 1090ES automatic signal detection method and system |
| CN106301413A (en) * | 2016-08-16 | 2017-01-04 | 中电科现代导航（西安）科技有限公司 | The airborne anti-interference reception of ADS B and processing method |
| CN107102215B (en) * | 2017-03-17 | 2019-09-20 | 清华大学 | The detection method of the leading frame head pulse of receiving end and receiving end |
| 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 |
| CN111211866B (en) * | 2019-12-27 | 2022-06-24 | 北京航空航天大学杭州创新研究院 | Novel power consistency verification method based on ADS-B |
| CN111988115B (en) * | 2020-08-31 | 2023-02-03 | 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 |
| 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 |
| CN115015797B (en) * | 2022-08-08 | 2022-10-14 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499880A (en) * | 2009-03-03 | 2009-08-05 | 四川九洲电器集团有限责任公司 | Signal detection method and apparatus based on broadcast type automatic dependent surveillance |
| CN102833130A (en) * | 2012-08-22 | 2012-12-19 | 宁波成电泰克电子信息技术发展有限公司 | Preamble detection method of S-mode ADS_B (automatic dependent surveillance-broadcast) system based on polymorphic parallel processing |
| CN102831789A (en) * | 2012-08-22 | 2012-12-19 | 宁波成电泰克电子信息技术发展有限公司 | Error correcting and detecting method of FPGA (Field Programmable Gate Array) based S mode ADS_B (Automatic Dependent Surveillance-Broadcast) system |
-
2013
- 2013-02-07 CN CN201310049977.8A patent/CN103199944B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499880A (en) * | 2009-03-03 | 2009-08-05 | 四川九洲电器集团有限责任公司 | Signal detection method and apparatus based on broadcast type automatic dependent surveillance |
| CN102833130A (en) * | 2012-08-22 | 2012-12-19 | 宁波成电泰克电子信息技术发展有限公司 | Preamble detection method of S-mode ADS_B (automatic dependent surveillance-broadcast) system based on polymorphic parallel processing |
| CN102831789A (en) * | 2012-08-22 | 2012-12-19 | 宁波成电泰克电子信息技术发展有限公司 | Error correcting and detecting method of FPGA (Field Programmable Gate Array) based S mode ADS_B (Automatic Dependent Surveillance-Broadcast) system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103199944A (en) | 2013-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103199944B (en) | automatic dependent surveillance broadcast signal detecting method and device | |
| CN107656266B (en) | S-mode secondary radar information fusion system based on ADS-B and fusion method thereof | |
| CN102831789B (en) | Error correcting and detecting method of FPGA (Field Programmable Gate Array) based S mode ADS_B (Automatic Dependent Surveillance-Broadcast) system | |
| CN103618588B (en) | A kind of auto-baud-detect method and detection module | |
| CN104297643A (en) | Electric power circuit insulation fault early warning device | |
| CN106935079B (en) | ADS-B signal acquisition and reliability verification method based on software radio platform | |
| CN102833130A (en) | Preamble detection method of S-mode ADS_B (automatic dependent surveillance-broadcast) system based on polymorphic parallel processing | |
| CN114295137B (en) | Takang signal identification method and system based on FPGA | |
| CN101702024A (en) | Method and device for processing signals based on broadcast mode automatic dependent surveillance | |
| CN104253721B (en) | A kind of data bit extraction method of S mode answer signal in ADS B systems | |
| CN110031854A (en) | A kind of more echoes of real-time high-precision laser are apart from extracting method | |
| CN103823361A (en) | Multi-source dynamic self-adaptation clock synchronization method and device | |
| CN102101487B (en) | Method and system for acquiring tracking status of train | |
| CN101750605B (en) | Anti-interference treatment method based on navigation management secondary radar test system | |
| CN103698662A (en) | Detection method and device for fault of direct current ice thawing overhead ground wires | |
| CN216848010U (en) | Cable partial discharge online monitoring device for edge calculation | |
| CN101499880A (en) | Signal detection method and apparatus based on broadcast type automatic dependent surveillance | |
| CN103941579A (en) | Time recording and clock synchronizing method and device for oceanographic instruments | |
| CN110161376A (en) | A kind of traveling wave fault moment extraction algorithm | |
| CN107804343A (en) | Train follows the trail of early warning system | |
| CN103354512A (en) | S-mode ADS-B system header detection method based on correlation detection technology | |
| CN105550702A (en) | GNSS deception jamming recognition method based on SVM | |
| CN112141169B (en) | Verification method, verification device, storage medium, train and electronic equipment | |
| CN105044742B (en) | Baseband processing unit capable of simultaneously receiving pseudo satellite and satellite signal and method thereof | |
| CN105573110A (en) | Leap second detection system and method of GNSS time synchronization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160330 Termination date: 20200207 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |