CN102175997B - Air traffic control transponder side lobe inhibition time detecting mode - Google Patents
Air traffic control transponder side lobe inhibition time detecting mode Download PDFInfo
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Abstract
The invention discloses an air traffic control transponder side lobe inhibition parameter detecting technology, which belongs to the secondary radar field, and provides a thought and method for detecting a side lobe inhibition time parameter of an air traffic control transponder. The description introduces the system composition of the technology, particularly states the work principle and work flow of a digital signal processing part. The technology has good application effect and foreground, and can effectively and accurately obtain a side lobe inhibition time. A secondary radar query-response work principle comprises the following steps: firstly sending a detection coding signal to the air traffic control transponder to trigger the transponder to generate a response signal, and then detecting the response signal; and counting and computing the change rule of the detection coding signal to obtain the side lobe inhibition time of the transponder.
Description
Technical field
The present invention relates to a kind of aviation management answering machine Sidelobe Suppression time detecting working method.
Background technology
At present, international navigation management secondary radar field causes ground radar can't distinguish the azimuth-range at Aircraft Targets place in order to prevent that being in inquiry main beam answering machine in addition in the air produces recall signal, and system has adopted the Sidelobe Suppression technology.The interrogating signal of navigation management secondary radar inquisitor emission adopts three pulse suppressor modes, namely launch powerful P1 and the P3 pulse except being had by inquisitor than antenna main beams highly directive, can 360 ° of rotations, in addition by omnidirectional antenna after the P1 pulse front edge after the 2 μ s pulse of smaller power emission P2 Sidelobe Suppression as Sidelobe Suppression (SLS).
Navigation management secondary radar inquisitor antenna radiation pattern is as shown below, comprises inquiry main beam, minor lobe and control wave beam.P1 and P3 interrogation pulse are respectively 8 μ s(Mode As to the interval) and 21 μ s(pattern C), it is launched by the inquiry main beam.P2 is the Sidelobe Suppression pulse, and it is launched by the control wave beam, and its directional diagram is a circle; P2 impulse radiation power level is than more than the little 18dB of inquiry main beam peak power rating level.So when aircraft was in main beam azimuth, the aviation management answering machine receives P1 and P3 interrogation pulse amplitude is far longer than the P2 pulse height; Otherwise when aircraft was in the secondary lobe orientation, the aviation management answering machine received the P2 pulse height greater than P1 and P3 interrogation pulse amplitude; Answering machine judges that by the relative amplitude of P1 and P2 relatively the signal that receives is from secondary lobe (P2〉P1) or main lobe (P1〉P2).If P1 just must reply interrogating signal than the high 9dB of P2 on the intensity; If P1 is less than P2, answering machine can not be replied; If P1 than the difference of P2 at 0dB between the 9dB, answering machine can be replied also and can not replied, sidelobe suppression system pulse height relation is as shown below.When answering machine receives the P2 Sidelobe Suppression pulse that meets the demands, will start immediately inhibit feature, all inquiries to be suppressed, the Sidelobe Suppression retention time is 35 ± 10 μ s.
A lot of for the detecting instrument instrument of aviation management answering machine both at home and abroad, but function or ability that most detecting instrument instrument does not detect aviation management answering machine Sidelobe Suppression time parameter; Simultaneously, detect this parameter by wireless means and also have certain difficulty.Aviation management answering machine Sidelobe Suppression time detection technology carries out fast detecting for the Sidelobe Suppression time parameter exactly, can be fast, its parameter value of Obtaining Accurate, whether satisfy the requirement of ICAO with this parameter of check answering machine equipment.
Summary of the invention
The technical problem to be solved in the present invention is for the aviation management answering machine provides a kind of detection means to the Sidelobe Suppression time parameter, can be fast, its Sidelobe Suppression time of Obtaining Accurate.
The present invention utilizes secondary radar challenge-response principle of work, at first detects coded signal to the emission of aviation management answering machine, triggers answering machine and produces recall signal, answer signal is detected again.By statistics with calculate to detect the Sidelobe Suppression time that the Changing Pattern of coded signal obtains answering machine.
Aviation management answering machine Sidelobe Suppression time detecting system comprises: power supply, transmitter, receiver, signal processing unit (comprising the FPGA(field programmable gate array) and DSP(high speed digital signal processor)), the compositions such as control computing machine, interface circuit, finish fast detecting and demonstration to the aviation management answering machine Sidelobe Suppression time.
Power supply is to provide required voltage for each ingredient in the system.It is input as alternating current 220V/50Hz, and output is each extension set or the required direct-current working volts of module, and guarantees the output power consumption of every group of voltage; Simultaneously, for transmitter required low pressure and high-voltage power supply, adopted to postpone design, namely high-voltage power supply is than the low-tension supply delay start about 2 seconds, thus protection transmitter power amplifying circuit.
Transmitter mainly is that output is modulated, amplified to Sidelobe Suppression time detecting coded signal.This transmitter frequency of operation is 1030MHz ± 0.5MHz, and emissive power satisfies required distance.During work, at first coded signal is carried out the ASK modulation, the modulation centre frequency is 1030MHz; The coded signal that to finish again modulation carries out power amplification by power amplification circuit, exports behind the last pass filter.Whether simultaneously, transmitter has the function to the output signal detection, can the visual inspection transmitter output signal correct.
Receiver be mainly used in to the coded signal that answering machine is answered receive, filtering, demodulation, output encoding the response signal.This receiver receive frequency range is 1087MHz～1093MHz, and the reception dynamic range is 50dB, and receiving sensitivity is better than-72dBm.Receiver in the native system has adopted the RF digitization technology, during work, at first carries out filtering, amplification and frequency-selecting, has then carried out high frequency A/D, processes by high-speed digital signal at last, finishes digital demodulation, output TTL coded signal; Simultaneously, receiver has self-checking capability, finishes the receiver self check by the self check order, and the output self-detection result.
The control computing machine mainly is system to be controlled with result data show.During system works, by control Computer display control software system is controlled, after the startup Sidelobe Suppression time detecting function, receive the testing result data, and with result data demonstration, storage.
Interface circuit is that the signal of each ingredient of completion system connects for reception, emission, signal are processed, presentation control function carries out signal format, data-switching.
The realization that focuses on Sidelobe Suppression time parameter detection algorithm of the present invention:
Detection system core processing and detection algorithm are finished by signal processing unit, and signal processing unit mainly comprises FPGA and DSP.
The design input is the answer signal (TTL signal) after receiver is processed, and design output is the Sidelobe Suppression time parameter data of uploading computing machine.Utilize present technique to realize each mode query coding of aviation management after transmitter modulation amplifying emission, is waited for receiving answer signal; The answer signal that receives is deciphered, obtain supplemental characteristic after, be uploaded to that terminal shows and preserve.DSP mainly finishes communication process and data buffer storage, and FPGA mainly finishes each mode query coding, answer signal decoding, reference record with deposit.
Description of drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the graph of a relation of software and hardware of the present invention.
Fig. 2 is working-flow figure of the present invention.
Fig. 3 is that goal verification of the present invention detects key diagram.
Fig. 4 is Sidelobe Suppression time detecting algorithmic descriptions figure of the present invention.
Fig. 5 is Sidelobe Suppression time detecting algorithm flow block diagram of the present invention.
Fig. 6 is decoding relevant treatment theory diagram of the present invention.
Embodiment
Disclosed all features in this instructions, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
The present invention is described in further detail below in conjunction with accompanying drawing.
The graph of a relation of 1 software and hardware:
System is mainly by power supply, transmitter, receiver, signal processing unit (comprising the FPGA(field programmable gate array) and DSP(high speed digital signal processor)), control computing machine, interface circuit etc. form, as shown in Figure 1.
Power supply is to provide required voltage for each ingredient in the system.Transmitter mainly is that output is modulated, amplified to Sidelobe Suppression time detecting coded signal.Receiver be mainly used in to the coded signal that answering machine is answered receive, filtering, demodulation, output encoding the response signal.The control computing machine mainly is system to be controlled with result data show.Interface circuit is that the signal of each ingredient of completion system connects for reception, emission, signal are processed, presentation control function carries out signal format, data-switching.Signal processing unit is realized detection system core processing and detection algorithm.
2 working-flows:
Working-flow figure as shown in Figure 2.Send instructions under the aobvious control computer, signal processing unit receives instruction.After judgement is the order of Sidelobe Suppression parameter detecting, reporting current is that the parameter detecting work state information is to computing machine, and begin to carry out the goal verification detection, if goal verification is unsuccessful, the goal verification that then carries out lower a kind of pattern detects, until after the goal verification success, begin to carry out the Sidelobe Suppression time detecting, after successfully detecting, the data that obtain are preserved, the wait computing machine reads, and begins other goal verification detection; After judgement is the data upload order, the Sidelobe Suppression time data of preserving is reported aobvious control computer, transfer to Computer Processing and preservation; If be standby command, then respond standby, and passback work at present state.
3 goal verifications detect:
Carry out the Sidelobe Suppression time detecting, at first will carry out the affirmation to target.After DSP receives the parameter detecting order, FPGA at first sends 3 groups of interrogation codings, be 2ms interval time between every group (forward position of first group of first pulse and next are organized the interval time in the forward position of first pulse), in this process, after receiving first group of corresponding answer signal, record answer codes and this answer codes of answer delay t(of this answer signal and reply the decoding relative program that time-delay will be applied to the Sidelobe Suppression time detecting), and begin to carry out the Sidelobe Suppression time detecting.If after these 3 groups inquiries, there is not one group of answer signal to occur, the goal verification that then carries out other pattern detects.Goal verification detects key diagram as shown in Figure 3.
4 Sidelobe Suppression time detecting algorithms:
After confirming the duty of target, utilize the signal format of confirming that target is launched, carry out the Sidelobe Suppression time detecting.As shown in the figure, launch first two groups of interrogation codings, the first group coding of two group codings is with the Sidelobe Suppression pulse, the second group coding then is normal interrogation coding, two group codings are different because of the difference of mode of operation interval time, interval time is than interrogation coding length long getting final product slightly, and take a kind of mode of operation as example, be 25 μ s two group coding interval times.Wait for and receive reply data, if (answer signal will be deciphered relevant treatment not receive corresponding one group of answer signal, be signal meet goal verification detect determined answer codes with reply the time-delay t), then continue two groups of interrogation codings of emission, this two group coding interval time is than increasing by 1 μ s interval time last time, the time interval is cumulative so successively, until receive corresponding one group of answer signal.At this moment record n μ s interval time, this namely is to reply the Sidelobe Suppression time.And begin to carry out the detection of other pattern.Sidelobe Suppression time detecting algorithmic descriptions figure as shown in Figure 4.
Annotate: n≤300, if the time interval is added to 300 μ s, still there are not two groups to reply, do not record this n value, carry out the detection of other state.
5 Sidelobe Suppression time detecting algorithm flows:
After signal processing module receives work order, determine whether to detect instruction, if so, then carry out target detection, if do not confirm target, then translative mode is carried out new goal verification, until the goal verification success.Then, beginning Sidelobe Suppression time detecting successfully detects Sidelobe Suppression after the time, save data judges whether all patterns are all detected, if all patterns are not detected, then carry out the detection of next mode of operation, if finished all detections, then withdraw from trace routine.Sidelobe Suppression time detecting algorithm flow chart as shown in Figure 5.
6 decoding relevant treatment:
The decoding relevant treatment partly is the basis of Sidelobe Suppression parameter detecting technology, and it mainly finishes the decoding to answer signal.Its theory diagram as shown in Figure 6.By interrogating signal with reply delay data, calculate the time that the effective response signal occurs, to carry out time domain relevant with the answer signal that receives, filter out the answer signal that receives in this time domain, then deliver to and reply decoding module and decipher, obtain answer codes, the data among the answer codes that obtains and the code data RAM are compared, whether effective, effectively then output decoding sign if drawing answer signal.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (3)
1. aviation management answering machine Sidelobe Suppression parameter detecting system, its hardware system comprise power supply, transmitter, receiver, comprise the core processing unit of FPGA and DSP, aobvious control computer, interface circuit; Be used to described aviation management answering machine that a kind of detection means to the Sidelobe Suppression time parameter is provided, can obtain its Sidelobe Suppression time parameter, whether satisfy the requirement of ICAO with the Sidelobe Suppression time parameter of checking aforementioned aviation management answering machine, it is characterized in that: the detection of described Sidelobe Suppression time parameter is after the duty of confirming target, utilize the signal format of confirming that target is launched, detect; Launch first two groups of interrogating signal codings, the first group coding of two group codings is with the Sidelobe Suppression pulse, the second group coding then is normal interrogating signal coding, wait for and receive answer signal, if do not receive corresponding one group of answer signal, then continue two groups of interrogating signals codings of emission, this two group coding interval time is than increasing by 1 μ s interval time last time, the time interval is cumulative so successively, until receive corresponding one group of answer signal; At this moment record interval time, this namely is to reply the Sidelobe Suppression time; And begin to carry out the detection of other pattern.
2. aviation management answering machine Sidelobe Suppression parameter detecting system according to claim 1, it is characterized in that: the core of this system is described core processing unit, by cooperating between the DSP on the core processing unit and the FPGA, the function processed of settling signal effectively; DSP finishes the passback of reception, data upload communication process and duty to steering order, and control FPGA carries out work; FPGA finishes the detection of interrogating signal coding, answer signal decoding, goal verification detection, Sidelobe Suppression time parameter, decoding relevant treatment, data is preserved.
3. aviation management answering machine Sidelobe Suppression parameter detecting system according to claim 1 and 2, the specific works process that it is characterized in that the detection of described Sidelobe Suppression time parameter is: at first will carry out the affirmation to target, after DSP receives the parameter detecting order, FPGA at first sends 3 groups of interrogating signal codings, be 2ms interval time between every group, in this process, after receiving first group of corresponding answer signal, record answer codes and the answer delay t of this answer signal, and begin to carry out the Sidelobe Suppression time detecting; If after these 3 groups inquiries, there is not one group of answer signal to occur, the goal verification that then carries out other pattern detects.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102521526B (en) * | 2011-12-30 | 2014-07-16 | 四川九洲电器集团有限责任公司 | Signal processing device based on soft data support target estimation |
| CN106338720A (en) * | 2016-09-29 | 2017-01-18 | 四川九洲电器集团有限责任公司 | Responder silence time detection method and system |
| CN109683140A (en) * | 2018-12-29 | 2019-04-26 | 陕西宝成航空仪表有限责任公司 | A kind of method that air traffic surveillance equipment realizes Sidelobe Suppression |
| CN110687507B (en) * | 2019-10-18 | 2021-09-14 | 四川九洲空管科技有限责任公司 | Transponder sidelobe suppression judgment method, device and medium based on FPGA |
| CN111398908B (en) * | 2020-03-10 | 2022-04-26 | 四川九洲空管科技有限责任公司 | FPGA-based navigation management responder sidelobe suppression judgment method and system |
| CN113037427B (en) * | 2021-03-03 | 2022-08-16 | 四川九洲空管科技有限责任公司 | Anti-cheating response method applied to friend or foe identification system |
| CN113567787B (en) * | 2021-07-28 | 2024-04-09 | 北京铁路信号有限公司 | Transponder interface parameter detection device and method, storage medium and electronic equipment |
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| CN101464513A (en) * | 2007-12-21 | 2009-06-24 | 中国电子科技集团公司第五十研究所 | Non-continuous spectrum high-frequency radar range sidelobe suppression apparatus and method thereof |
| CN201464645U (en) * | 2009-07-02 | 2010-05-12 | 四川信能科技发展有限公司 | Secondary radar mode S test transponder |
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| DE102008010882A1 (en) * | 2008-02-25 | 2009-09-03 | IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH | Device and method for direction estimation and / or decoding of secondary radar signals |
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| CN101464513A (en) * | 2007-12-21 | 2009-06-24 | 中国电子科技集团公司第五十研究所 | Non-continuous spectrum high-frequency radar range sidelobe suppression apparatus and method thereof |
| CN201464645U (en) * | 2009-07-02 | 2010-05-12 | 四川信能科技发展有限公司 | Secondary radar mode S test transponder |
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