CN102175997A - 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 Target 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, promptly launch powerful P1 and the P3 pulse except having 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 to being respectively 8 μ s(Mode As at 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 littler 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 inhibit feature immediately, 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 at the Sidelobe Suppression time parameter exactly, can fast, accurately obtain its parameter value, whether satisfies 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 fast, accurately obtain its Sidelobe Suppression time.
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)), composition such as control computer, 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, promptly 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 modulation again 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 is mainly used in that the coded signal that answering machine is answered receives, 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 carried out high frequency A/D then, handles 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.
Control computer mainly is system to be controlled with result data show.During system works, system is controlled, after the startup Sidelobe Suppression time detecting function, receive the testing result data, and result data is shown, stores by control computer demonstration Control Software.
Interface circuit is for reception, emission, signal Processing, presentation control function carry out signal format, data-switching, and the signal of finishing each ingredient of system connects.
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 handled, 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 metadata cache, and FPGA mainly finishes each mode query coding, answer signal decoding, reference record with deposit.
Description of drawings
The present invention will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the graph of a relation of software and hardware of the present invention.
Fig. 2 is system works flow process 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 a Sidelobe Suppression time detecting algorithm flow block diagram of the present invention.
Fig. 6 is a 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 computer, 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 is mainly used in that the coded signal that answering machine is answered receives, filtering, demodulation, output encoding the response signal.Control computer mainly is system to be controlled with result data show.Interface circuit is for reception, emission, signal Processing, presentation control function carry out signal format, data-switching, and the signal of finishing each ingredient of system connects.Signal processing unit is realized detection system core processing and detection algorithm.
2 system works flow processs:
System works flow process figure as shown in Figure 2.Show under the control computer and send instructions signal processing unit reception instruction.After judgement is the order of Sidelobe Suppression parameter detecting, report and currently give computing machine for the parameter detecting work state information, and begin to carry out the goal verification detection, if goal verification is unsuccessful, then descend a kind of goal verification of pattern to detect, 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 apparent 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 affirmation 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, write down 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 two groups of interrogation codings earlier, first group coding of two group codings has the Sidelobe Suppression pulse, second group coding then is normal interrogation coding, two group codings are different because of the difference of mode of operation interval time, get final product than interrogation coding length is slightly long interval time, is example with a kind of mode of operation, and 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 adds up so successively, up to receiving corresponding one group of answer signal.At this moment note n μ s interval time, this promptly 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 write down this n value, carry out other status detection.
5 Sidelobe Suppression time detecting algorithm flows:
After signal processing module receives work order, judge whether to instruct into detecting, if, then carry out target detection, if do not confirm target, then translative mode is carried out new goal verification, up to the goal verification success.Then, beginning Sidelobe Suppression time detecting successfully detects Sidelobe Suppression after the time, preserve data, judge whether all patterns are all detected, if all patterns are not detected, then carry out the detection of next mode of operation,, then withdraw from trace routine if finished all detections.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 is seen 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, deliver to then and reply decoding module and decipher, obtain answer codes, the data among 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 (4)
1. aviation management answering machine Sidelobe Suppression parameter detecting system is characterized in that: its hardware system comprises power supply, transmitter, receiver, comprises the core processing unit of FPGA and DSP, shows 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 answering machine equipment.
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 DSP on the core processing plate and the FPGA, finish the function of signal Processing effectively; DSP finishes the passback of communication process such as reception to steering order, data upload and duty, 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 preservation etc.
3. aviation management answering machine Sidelobe Suppression parameter detecting system according to claim 1 and 2, the concrete course of work 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 interrogation codings, be 2ms interval time between every group, in this process, after receiving first group of corresponding answer signal, write down the 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.
4. aviation management answering machine Sidelobe Suppression parameter detecting system according to claim 1 and 2 is characterized in that: after the duty of target is confirmed in the detection of described Sidelobe Suppression time parameter, utilize the signal format of confirming that target is launched, detect; Launch two groups of interrogation codings earlier, first group coding of two group codings has the Sidelobe Suppression pulse, second group coding then is normal interrogation coding, wait for and receive reply data, if do not receive corresponding one group of answer signal, 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 adds up so successively, up to receiving corresponding one group of answer signal; At this moment note interval time, this promptly is to reply the Sidelobe Suppression time; And begin to carry out the detection of other pattern.
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Cited By (7)
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| CN102521526A (en) * | 2011-12-30 | 2012-06-27 | 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 |
| CN110687507A (en) * | 2019-10-18 | 2020-01-14 | 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 |
| CN111398908A (en) * | 2020-03-10 | 2020-07-10 | 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 |
| CN113037427A (en) * | 2021-03-03 | 2021-06-25 | 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 |
| CN113567787A (en) * | 2021-07-28 | 2021-10-29 | 通号(北京)轨道工业集团有限公司轨道交通技术研究院 | Transponder interface parameter detection device and method, storage medium and electronic equipment |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102521526A (en) * | 2011-12-30 | 2012-06-27 | 四川九洲电器集团有限责任公司 | Signal processing device based on soft data support target estimation |
| 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 |
| CN110687507A (en) * | 2019-10-18 | 2020-01-14 | 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 |
| 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 |
| CN111398908A (en) * | 2020-03-10 | 2020-07-10 | 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 |
| 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 |
| CN113037427A (en) * | 2021-03-03 | 2021-06-25 | 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 |
| CN113567787A (en) * | 2021-07-28 | 2021-10-29 | 通号(北京)轨道工业集团有限公司轨道交通技术研究院 | Transponder interface parameter detection device and method, storage medium and electronic equipment |
| 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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