CN1982914B - Radar data self-adaptive non-loss compression based on decode and message discrimination - Google Patents
Radar data self-adaptive non-loss compression based on decode and message discrimination Download PDFInfo
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Abstract
An adaptive nondestructive compressing method of radar data based on decode and message identification includes receiving various radar data by multi-radar data processing and receiving interface; finalizing data input and output, parameter configuration, receiving test, conversion of radar format, message identification and coordinate transform by nondestructive compression master control module; discarding error messages directly after message identification then carrying out secondary nondestructive compression on data to output correct radar data as per format for realizing object-track in real time.
Description
One, affiliated technical field
The present invention relates to the data management of air traffic control radar, particularly the lossless compress of decoding and message radar data specifically is based on the radar data self-adaptive non-loss compression that decoding and message are discerned.
Two, background technology
External now multi-channel digital synchronous recording instrument adopts " waveform coding " record to Radar channel, and interface is simple like this, can avoid the decoding and the message identification difficulty of the multiple different radars of complexity.Because the requirement to the radar data compression can't harm, thereby encoding compression is than very little, generally less than 2: 1 (what have does not also simply compress, and directly presses the communication baud rate record).Even under the aimless so aloft situation, the data of record are also near communication baud rate, and the overwhelming majority is a garbage.Along with many radar networkings and many radars air traffic control system are applied gradually in China, a measuring point is very fast to the requirement increase of record Radar channel quantity.Calendar year 2001 for example, the Radar channel quantity that North China air traffic control centre of civil aviaton (Captical International Airport) adopts is 48, and the northern China (Beijing) in building, east (Shanghai), south (Guangzhou) three big AREA CONTROL CRNTREs are 60 channels to the quantitative requirement that writes down Radar channel, and require double redundancy.The radar record technology of inlet system can not adapt to this requirement.Particularly owing to historical reasons, China's active service air traffic control radar system and interface are multifarious, are famous " seven states, eight systems ", even the product of same company concerns that because of the import time limit its built-in message form is also different.Under the situation, it is very urgent that the problem of lossless compress seems in this.In the prior art, exist the radar data ratio of compression little and can not satisfy the requirement of many radar record, especially the lossless compress of the radar data self-adaptive of discerning based on decoding and message yet there are no report.
Three, summary of the invention
The purpose of this invention is to provide a kind of radar data ratio of compression and significantly improve, satisfy the lossless compression method of the decoding and the message identification of many radar record requirements simultaneously.This method has not only realized the correct decoding and the message of air traffic control radar, accomplishes self-adaptation, can also carry out the imaging of real-time target following and radar target to radar data.
The objective of the invention is to reach like this: lossless compress adopts the method for second-compressed, at first the decoding and the message of various hollow-pipe radar data are discerned, accomplish self-adaptation, compress most of garbage, adopt the method for routine data compression to carry out second-compressed then.Its concrete grammar is: use many radar datas to handle receiving interfaces and receive data, accomplish the self-adaptation of various communication protocols at microprocessor, finish the reception of various radar data.Enter the lossless compress main control module then, in this module, finish data input and output, parameter configuration, acceptance test, radar format conversion, message identification and coordinate transform, after message identification, error message is directly abandoned, the go forward side by side secondary lossless compress of line data is exported according to form the correct radar data after the compression at last.
Control program in main control module is: after entering main control module, at first to receiving module testing and feeding back in the main control module.Main control module carries out entering start-up routine after the parameter configuration, in the rate adaptation adjusting module, finish the speed adjustment, carry out format identification, message identification with existing communication format comparison, whether judge message correct, error message directly abandons, correct message is carried out coordinate transform, carry out the lossless compress second time of radar data again.Correct data after the compression is pressed form output, and enter register system and ATC air traffic control system, carry out radar data processing and demonstration.
The microprocessor that many radar datas are handled receiving interface is can be to the risc architecture microprocessor of existing various radar communication format identification.
To be module enter RX initial buffer district after the outside port reading of data to the input of described data enters the RX formation again, and to primary processor, output is from primary processor data to be write the TX formation, be written to TX initial buffer district from the TX formation, arrives outside port again.
Described parameter configuration module is meant supports HDLC and two kinds of synchronous communications protocol of BSC, supports present China active service hollow-pipe radar data form, adapts to the module of the various Transmission bit rates of 0～64kbps automatically.
Described radar format converting module adopts the structurized module design, implementation step is: all passages of configuration initialization of the parameter configuration table of reshuffling according to parameter configuration module, the length of the passage of discerning this grouping input, output reading of data and Frame from this grouping, find corresponding input, the radar form of output according to parameter configuration table, according to the radar form of input, carry out the identification of form according to field corresponding in the data layout.
Described coordinate transformation module adopts the experience correction formula, and implementation step is: carry out conformal transformation: the earth is become a desirable spheroid, and longitude, the latitude of radar station are transformed into conformal coordinates; Determine system centre: the location coordinates of determining to accept the strange land radar data; It is initial point and the flat circle tangent with spheroid that desirable spheroidal coordinate is converted to system centre; Local radar data is converted to the radar data at relative system center.
Described second-compressed to radar data is that the true message of lossless compress module registration carries out the TXW encoding compression processing, passes out to after the processing in the TX formation.
Described second-compressed to radar data is that the true message of lossless compress module registration carries out algebraic coding compression processing, delivers to after the processing in the TX formation.
The present invention has following good effect:
1, solved the weak problem of other domestic and international Related product radar data compressed capability.
The import digital recorder adopts the waveform coding record to radar data, and interface and software are all simple like this, but further compression radar data basically.Even under the aimless so aloft situation, the data of record are also near communication baud rate, and the overwhelming majority is a garbage.Along with many radar networkings and many radars air traffic control system are applied gradually in China, a measuring point is very fast to the requirement increase of record Radar channel quantity, and the problem of many radar data compressions seems very outstanding.The present invention has overcome the weak problem of radar data compressed capability, and the channel ratio of compression improves 1～2 order of magnitude than import homogeneous system.
2, solved the many radar record requirement of radar record system.
The air traffic control system of China civil aviaton, army boat has all adopted many radars networkings and integration technology, and the Radar channel number that single airport air traffic control centre need write down increases (maximum has reached 60) greatly, and the import digital recorder is difficult to satisfy the requirement of many radar record.Multifarious at China's active service air traffic control radar system and interface, the concrete condition that message format has nothing in common with each other, the present invention has realized the correct decoding of the existing various air traffic control radar of China and message identification, and has accomplished self-adaptation.Realized requirement, realized multiple radar data has been realized the lossless compress ability of decoding and message identification many radar record.
3, solve other domestic and international digital recording product, can not supervise the problem of radar image.
The reason that domestic and international product can not supervise radar image is not have radar decoding and radar data processing power, can only be played back to local radar and supervise, and is very inconvenient to the nonlocal radar monitoring of abnormal shape in many radars epoch.The present invention has realized the decoding of domestic existing various air traffic control radar and radar data are handled, and realizes the supervision to various radar.Blank pipe supervisory department can supervise this locality or air traffic scene that nonlocal radar reflected at any time on one side like this, monitor the conversation between pilot and the ground control person on one side, find that unsafe factor takes immediate steps, and just playback affirmation repeatedly at once, and do not influence the continuation record during playback, so just, expanded to the real-time instrument of supervising of the security that to carry out air traffic the instrument that writes down merely in order to the back playback analysis that meets accident from.
Four, description of drawings
Fig. 1, many radar datas handle receiving interface and draw the access node composition.
Fig. 2, main control module lossless compress process flow diagram.
Fig. 3, data input/output module workflow diagram.
Five, embodiment
Accompanying drawing has provided a specific embodiment of the present invention.
Referring to accompanying drawing.This method has adopted the method for second-compressed.At first using many radar datas to handle receiving interface gathers radar data.Because radar signal is the synchronous digital signal that transmits frame by frame, realize that it is the assurance of reliable synchronous communication channel that many radar datas are handled the prerequisite that receives.This interface uses the microprocessor of risc architecture, directly also can receive and playback FSK frequency shift keyed signals with existing various air traffic control radar interface.What Fig. 2 had provided strange land radar and local radar processing unit draws the access node composition, and this interface is applicable to existing all the radar communication forms of China.
In the lossless compress main control module, contain several main modular such as data input/output module, parameter configuration module, acceptance test module, radar format converting module, coordinate transformation module, message identification and secondary data compression module.The procedure chart 1 of its second-compressed has illustrated.
The flow process of data input/output module as shown in Figure 3.Input traffic is that the system bottom program is from extraneous reading of data, and drop it off among the initial send buffer RX, the bottom program is constantly checked Initial R X buffer zone, and the data process is handled, whether verification correct, remove the head and tail of host-host protocol after, take out clear data and put into the RX formation.Output stream is just in time opposite.
Parameter configuration module is supported HDLC and two kinds of synchronous communications protocol of BSC, can adapt to the various Transmission bit rates of 0～64kbps automatically, and the radar data form is supported China's active service air traffic control radar at present such as ALENIA, TOSHIBA, RAYTHEON.
The acceptance test module is mainly used in the data of test input channel, and can enroll radar data in real time as the Analysis of Radar data layout, and this module connects in the debug process important in system.
The miscellaneous situation of radar that the radar format converting module is introduced at present China to the correct decoding and the message identification of air traffic control radar, is accomplished the self-adaptation without manual intervention, has finished the different agreement of several main radars, the communicating requirement of different rates.This part software is because the content that relates to is many, the task complexity, and real-time requires high, therefore adopts the structurized module design when software design.Performing step is: all passages of configuration initialization of the parameter configuration table of reshuffling according to parameter configuration module; Discern the channel number of this grouping input, output; The length of reading of data and Frame from this grouping; Find corresponding input, the radar form of output according to parameter configuration table; According to the radar form of input, carry out the identification of form according to field corresponding in the data layout.
Coordinate transformation module is to consider to draw the problem that the strange land radar certainly exists a coordinate plane conversion that connects.Through after the conversion of coordinate formula, result and actual target locations always produce certain error.In order to reduce error, when having considered in this module that ground north magnetic north ground difference and spherical projection are the plane distortion inaccuracy adopted the experience correction formula.Performing step: carry out conformal transformation; The earth is become a desirable spheroid, and longitude, the latitude of radar station are transformed into conformal coordinates; Determine system centre: the location coordinates of determining to accept the strange land radar data; It is initial point and the flat circle tangent with spheroid that desirable spheroidal coordinate is converted to system centre; Local radar data is converted to the radar data at relative system center.
Message identification module and lossless compress module are mainly finished the identification of the correctness of message, directly abandon for incorrect message, will send into the secondary treating that next step lossless compress of carrying out data is handled for correct message.For example processing such as LZW coding, algebraic coding.Its implementation is carried out the identification of radar data bag according to current radar type.If positive north is reported, the sector newspaper then carries out follow-up processing, if wrong message then directly abandons.Correct message needs to pass out to output port through passing out in the TX formation after the lossless compress for the system bottom program through the corresponding back of handling at last.
Connect that radar data is handled and display module after, the decoding and the message identification of the radar data by the front can be carried out the imaging of the real-time follow-up and the radar target of target to the radar data after compressing.Because we introduce at radar data, radar data decoding and message identification, realized the decoding of dissimilar Radar interface and radar built-in message and the ability of identification, therefore can utilize the result of front to realize that the tracking of the radar of number of different types distinct interface handles.
This lossless compression method has been realized the correct decoding of the existing various air traffic control radar of China and message identification and has been accomplished self-adaptation.So just can only write down effective message, the passage ratio of compression changes with target.Because within 24 hours, the most situations of aerial target are well below load-bearing capacity, thereby the average comprehensive ratio of compression of radar passage can reach tens of even hundreds of times.The outstanding advantage of this method in the radar data compression can be widely used in radar data register system and the air traffic control.
Claims (8)
1. radar data self-adaptive non-loss compression of discerning based on decoding and message, it is characterized in that: lossless compress adopts the method for second-compressed, at first the decoding and the message of various hollow-pipe radar data are discerned, accomplish self-adaptation, compress most of garbage, adopt the method for routine data compression to carry out second-compressed then, its concrete grammar is: use many radar datas to handle receiving interface and receive data, accomplish the self-adaptation of various communication protocols at microprocessor, finish the reception of various radar data, enter the lossless compress main control module then, in this module, finish the data input and output, parameter configuration, acceptance test, the radar format conversion, message identification and coordinate transform, after message identification, error message is directly abandoned, the go forward side by side secondary lossless compress of line data is exported according to form the correct radar data after the compression at last;
Control program in main control module is: after entering main control module, at first to receiving module testing and feeding back in the main control module, main control module carries out entering start-up routine after the parameter configuration, in the rate adaptation adjusting module, finish the speed adjustment, carry out format identification, message identification with existing communication format comparison, whether judge message correct, error message directly abandons, correct message is carried out coordinate transform, carry out the lossless compress second time of radar data again, correct data after the compression is pressed form output, and enter register system and ATC air traffic control system.
2. radar data self-adaptive non-loss compression as claimed in claim 1 is characterized in that: the microprocessor that many radar datas are handled receiving interface is can be to the risc architecture microprocessor of existing various radar communication format identification.
3. radar data self-adaptive non-loss compression as claimed in claim 1 or 2, it is characterized in that: to be module enter RX initial buffer district after the outside port reading of data to the input of described data enters the RX formation again, to primary processor, output is data to be write the TX formation from primary processor, from the TX formation, being written to TX initial buffer district, arrive outside port again.
4. radar data self-adaptive non-loss compression as claimed in claim 1 is characterized in that; Described data enter the lossless compress main control module, finish parameter configuration and be meant support HDLC and two kinds of synchronous communications protocol of BSC in this module, support present China active service hollow-pipe radar data form, adapt to the various Transmission bit rates of O～64kbps automatically.
5. radar data self-adaptive non-loss compression as claimed in claim 1, it is characterized in that: described data enter the lossless compress main control module, finishing the radar format conversion in this module is to adopt the structurized module design, implementation step is: all passages of configuration initialization of the parameter configuration table of reshuffling according to parameter configuration module, discern this grouping input, the length of the passage of output reading of data and Frame from this grouping, find corresponding input according to parameter configuration table, the radar form of output, according to the radar form of input, carry out the identification of form according to field corresponding in the data layout.
6. radar data self-adaptive non-loss compression as claimed in claim 1, it is characterized in that: described data enter the lossless compress main control module, finishing coordinate transform in this module is employing experience correction formula, implementation step is: carry out conformal transformation: the earth is become a desirable spheroid, and longitude, the latitude of radar station are transformed into conformal coordinates; Determine system centre: the location coordinates of determining to accept the strange land radar data; It is initial point and the flat circle tangent with spheroid that desirable spheroidal coordinate is converted to system centre; Local radar data is converted to the radar data at relative system center.
7. radar data self-adaptive non-loss compression as claimed in claim 1 or 2 is characterized in that: described second-compressed to radar data is that the true message of lossless compress module registration carries out the TXW encoding compression processing, passes out to after the processing in the TX formation.
8. radar data self-adaptive non-loss compression as claimed in claim 1 or 2 is characterized in that: described second-compressed to radar data is that the true message of lossless compress module registration carries out algebraic coding compression processing, delivers to after the processing in the TX formation.
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| CN101424738B (en) * | 2008-11-13 | 2011-06-01 | 国营险峰机器厂 | Method for processing real time digital pulse compression system based on FPGA |
| CN102523446B (en) * | 2011-12-26 | 2014-06-04 | 南京鹏力系统工程研究所 | Adaptive compression method of radar video in vessel traffic navigation system |
| CN104200540B (en) * | 2014-08-15 | 2016-08-24 | 中国人民解放军空军装备研究院雷达与电子对抗研究所 | Data recording equipment |
| CN107317833A (en) * | 2016-04-27 | 2017-11-03 | 青岛云世纪信息科技有限公司 | It is a kind of that unmanned plane service data is converted into the method that blank pipe monitors information format |
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| CN1390059A (en) * | 2001-06-01 | 2003-01-08 | 中国科学院计算技术研究所 | Data compressing method for complex image of synthetic apertre radar |
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