CN101750605B - Anti-interference treatment method based on navigation management secondary radar test system - Google Patents
Anti-interference treatment method based on navigation management secondary radar test system Download PDFInfo
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- CN101750605B CN101750605B CN2009102635431A CN200910263543A CN101750605B CN 101750605 B CN101750605 B CN 101750605B CN 2009102635431 A CN2009102635431 A CN 2009102635431A CN 200910263543 A CN200910263543 A CN 200910263543A CN 101750605 B CN101750605 B CN 101750605B
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Abstract
The invention relates to an anti-interference treatment method based on a navigation management secondary radar test system, which comprises the following steps: S1, initializing original data: initializing the system data of the navigation management secondary radar test system; S2, detecting a dynamic threshold sliding window: extracting an effective pulse signal sequence from the pulse signalsreceived from a navigation management secondary radar function test analyzer; S3, removing asynchronous interference pulse signals: removing the asynchronous interference pulse signals in the effective pulse signal sequence extracted in the step S2 to obtain the effective pulse signal sequence of a target navigation management secondary radar; S4, grouping pulses: grouping the pulses of the effective pulse signal sequence of the target navigation management secondary radar obtained in the step S3 to obtain the integral information data of target navigation management secondary radar; and S5, outputting a result. The invention has the advantage of improving the anti-interference capacity of the navigation management secondary radar test system.
Description
Technical field
The invention belongs to the radar control technical field of navigation, relate in particular to a kind of navigation management secondary radar test system.
Background technology
Navigation management secondary radar (Secondary Surveillance Radar; Be abbreviated as SSR); Be the identification of friend or foe, IFF that in air battle, develops at first, afterwards again the air traffic control that is used for civil aviaton after the ultimate principle of this system and the development of parts process in order to make radar tell aircraft between ourselves and the enemy.The controller from SSR readily appreciate that the numbering of aircraft, highly, parameter such as direction, make radar become the means of air control by the instrument of keeping watch on, the appearance of SSR is the most great technical progress of air traffic control.
Navigation management secondary radar (SSR) is under the cooperation of land station and target response device, employing inquiry, response mode work, it must could accomplish the function of using through twice active radiated electromagnetic wave signal (interrogating signal and answer signal are respectively once).The message exchange of navigation management secondary radar (SSR) is to realize through the content of the content of up interrogating signal and descending answer signal is carried out pulse code.The coded format of its interrogating signal (or interrogation mode) is as shown in Figure 1, has six kinds of interrogation modes, is respectively 1,2,3/A, B, C, D pattern; The different different inquiry contents of interrogation mode representative; These interrogation modes are made up of the interval different pulse, and first pulse is called P1, and second pulse is called P2; The 3rd pulse is called P3, the different interrogation mode of the different representatives with the interval between the P3 of P1; P2 is the Sidelobe Suppression pulse, and P1 and P2 fixed interval are 2us (microsecond); P1 and P3 are the main lobe pulse; The full sized pules width of P1, P2 and P3 is 0.8us.
Navigation management secondary radar functional test analyser is mainly accomplished the testing in the navigation management secondary radar system, can operate as normal thereby detect navigation management secondary radar (SSR), in time it is carried out localization of fault and maintenance etc.Navigation management secondary radar test system is as shown in Figure 2; Navigation management secondary radar functional test analyser wherein receives the interrogating signal of navigation management secondary radar (SSR) to the aerial target emission in its data buffer through the antenna of its outfit; It is tested, analyzes and differentiates, thereby learn this aviation management secondary thunder (SSR) but operate as normal whether.
When navigation management secondary radar functional test analyser is operated in the extremely complicated strong electromagnetic interference environment as shown in Figure 2; The pulse signal that navigation management secondary radar functional test analyser receives had both comprised the interrogating signal of target navigation management secondary radar emission, had also comprised the interference interrogating signal of some radar emission outside the monitored airport, interference answer signal that aerospace plane sends and other electromagnetic interference signal etc.Accomplish observing and controlling to the target navigation management secondary radar; Just must eliminate above-mentioned various undesired signals; The anti-interference processing method that existing navigation management secondary radar test system adopted mainly is based on the clutter inhibition technology of fixed threshold; And when navigation management secondary radar functional test analyser is operated in the extremely complicated strong electromagnetic interference environment as shown in Figure 2; Also be difficult to undesired signal is suppressed totally fully even adopt best clutter to suppress technology, so just reduced the check probability of effective impulse signal and influence the processing speed of rear end, thereby can't analyze and judge the duty of target navigation management secondary radar exactly.
Summary of the invention
The objective of the invention is to have proposed a kind of anti-interference processing method based on navigation management secondary radar test system in order to overcome existing navigation management secondary radar test system not strong shortcoming of antijamming capability under the strong electromagnetic interference environment of complicacy.
In order to realize the object of the invention, used following scheme: a kind of anti-interference processing method based on navigation management secondary radar test system may further comprise the steps:
S1. raw data initialization: the system data to navigation management secondary radar test system carries out initialization process;
S2. dynamic threshold sliding window detects: from the pulse signal that navigation management secondary radar functional test analyser receives, extract effective pulse signal sequence.
S3. remove asynchronous interference pulse signals: to the effective pulse signal sequence of extracting among the step S2, remove asynchronous interference pulse signals wherein, obtain the effective pulse signal sequence of target navigation management secondary radar.
S4. pulse is divided into groups: the effective pulse signal sequence of the target navigation management secondary radar that step S3 is obtained is carried out pulse and is divided into groups, and obtains the complete information data of target navigation management secondary radar.
S5. result's output: the complete information data of isolated target navigation management secondary radar are handled and exported through output device.
Below above-mentioned steps S2 has comprised again step by step:
S21. dynamic gate limit value (threshold) confirms;
S22. effective impulse location determination;
S23. the rising edge of slip scan effective impulse and negative edge;
S24. accurately extract the position and the width of effective impulse;
S25. calculate the accurate amplitude of effective impulse.
Below above-mentioned steps S3 has comprised again step by step:
S31. appoint and get an effective impulse signal;
S32. judge whether to be asynchronous interference pulse;
S33. recording storage is the effective impulse signal of target navigation management secondary radar.
Circulation is carried out above-mentioned steps S32, S33 effective impulse signal judgement to the last and is finished.
Beneficial effect of the present invention: owing to adopt method of the present invention, can effectively various undesired signals be removed, thereby effectively raise the antijamming capability of navigation management secondary radar test system.
Description of drawings
Fig. 1 is the interrogating signal format chart of navigation management secondary radar (SSR).
Fig. 2 is that navigation management secondary radar test system disturbs synoptic diagram.
Fig. 3 is the anti-interference processing method main flow chart.
Fig. 4 is that dynamic threshold sliding window detects (step S2) process flow diagram.
Fig. 5 is a dynamic threshold computation process synoptic diagram.
Fig. 6 is effective impulse position and the accurate effective impulse synoptic diagram that extracts.
Fig. 7 removes asynchronous interference pulse (step S3) process flow diagram.
Fig. 8 is pulse grouping (step S4) process flow diagram.
Embodiment
Below in conjunction with accompanying drawing and practical implementation the present invention is described further:
In the present embodiment; Selected target navigation management secondary radar is the navigation management secondary radar of 3/A interrogation mode; Its form is as shown in Figure 1, and wherein the range value of P1, P3 equates, the time interval of P1 and P3 is 8us; The time interval of P1 and P2 is 2us, and the range value of P1, P2 and P3 is a random variation in the process of emission.Present embodiment adopts the SF of 20MHz, and range of pulse repetition frequency is 150Hz～450Hz, and promptly the pulse repetition time is 2.2ms～6.7ms.
S1. raw data initialization: the system data to navigation management secondary radar functional test analyser carries out initialization process.Data such as interrogation mode to the judging threshold in the system data of navigation management secondary radar functional test analyser, memory pool distribution, data qualification and grouping, disturbing pulse class, initial buffer memory, navigation management secondary radar are carried out initialization process.
S2. dynamic threshold sliding window detects: from the pulse signal that navigation management secondary radar functional test analyser receives, extract effective pulse signal sequence.In navigation management secondary radar functional test analyser, increased the dynamic threshold sliding window detection module supporting with the present invention, this module can be extracted effective pulse signal sequence from the pulse signal that receives.The concrete implementation procedure of this step is as shown in Figure 4, below having comprised step by step:
S21. dynamic gate limit value (threshold) confirms.As shown in Figure 5; Begin from current sampling instant corresponding sampling points; In the pulse repetition time (pulse repetition time is 6.7ms to the maximum) of a maximum possible, the add up sampled value of all sampled points is asked the average sample value of sampled point in this cycle and then with its dynamic gate limit value (threshold) and record as all sampled points in this cycle; Aforesaid operations is carried out in circulation, and As time goes on, the dynamic gate limit value of the sampled point in each maximum impulse cycle is with dynamic change thereupon.
S22. effective impulse location determination.If begin continuously a plurality of (need judge sampled point number=SF * pulse width) amplitude of sampled point all on the dynamic gate limit value from certain sampled point, just with the position of this sampled point correspondence as an effective impulse position.When SF was 20MHZ in the present embodiment, the consideration pulse width was 0.8us, then when the data value of continuous 16 sampled points is on the dynamic gate limit value, just thought that it is an effective impulse position, otherwise was an invalid pulse position.In the specific implementation, can consider has certain redundance, can obtain the rough width of pulse when confirming an effective impulse position.
S23. the rising edge of slip scan effective impulse and negative edge.
Rising edge: begin the range value s of three points that in a pulse width, face mutually one by one from the effective impulse position
I-1, s
iAnd s
I+1, i=1 in the present embodiment, 2 ..., 15,16.
If
Be a possible rising edge position negative edge: begin three some s that face mutually one by one from the effective impulse position
I-1, s
iAnd s
I+1If,
If be that a possible negative edge position exists a plurality of possible rising edge positions, then with last rising edge as this pulse signal.If there are a plurality of possible negative edge positions, then with first negative edge as this pulse signal.
S24. accurately extract the position and the width of effective impulse.As shown in Figure 6, confirm the exact position of effective impulse according to the rising edge that extracts and negative edge position, and deduct the accurate pulse width that its rising edge position promptly gets this effective impulse with the negative edge position of effective impulse.
S25. calculate the accurate amplitude of effective impulse.As shown in Figure 6, all data points in the accurate pulse width of effective impulse are carried out The disposal of gentle filter, obtain the accurate amplitude of this pulse.Promptly the rising edge of each effective impulse and all data points between negative edge are asked on average, the value of gained i.e. the accurate range value of effective impulse for this reason.
Confirmed rising edge and negative edge, accurately pulse width and accurately the pulse signal of range value to output to next step etc. as effective pulse signal sequence pending.
S3. remove asynchronous interference pulse signals.To the effective pulse signal sequence of extracting among the step S2, remove asynchronous interference pulse signals wherein, obtain the effective pulse signal sequence of navigation management secondary radar.In navigation management secondary radar functional test analyser, increased the removal asynchronous interference pulse signals module supporting with the present invention, this module can be removed the asynchronous interference pulse signals in the effective pulse signal sequence that obtains among the step S3.Thereby obtain the effective pulse signal sequence of target navigation management secondary radar.Below in conjunction with Fig. 7 the concrete implementation procedure of this step is described in detail:
S31. appoint and get an effective impulse signal.From effective pulse signal sequence, appoint and get an effective impulse signal.
S32. judge whether to be asynchronous interference pulse.Range value according to this effective impulse signal; The time relationship of the navigation management secondary radar interrogation mode that obtains through dynamic gate limit value and initialization is judged this effective impulse; Search for forward or backward; See if there is the pulse of matching mutually, judge whether this effective impulse is asynchronous interference pulse with it.If not, then jump directly to next step; Otherwise, jump directly to next effective impulse signal, continue this step.
S33. the effective impulse signal of recording storage target navigation management secondary radar.For the non-asynchronous interference pulse that extracts among the step S32, recording storage is an effective impulse signal of target navigation management secondary radar.
Circulation is carried out above-mentioned steps S32, S33 effective impulse signal judgement to the last and is finished.
S4. pulse is divided into groups.The effective pulse signal sequence of the target navigation management secondary radar that step S3 is obtained is carried out pulse and is divided into groups, and obtains the complete information data of target navigation management secondary radar.Below in conjunction with Fig. 8 the concrete implementation procedure of this step is described in detail:
S41.P1/P3, P2 DISCHARGE PULSES EXTRACTION (P1/P3 is the main lobe pulse, the P2 side-lobe pulse).By the rising edge of a pulse position of former record, extract the pulse position and the amplitude of P1/P3 pulse, the i.e. position of main lobe pulse and amplitude according to the time order and function spaced relationship of P1 and P3.In like manner, can extract the pulse position and the amplitude of P2 pulse according to the time relationship of P1 and P2.
S42. best main lobe extracts.According to the main lobe pulse information of navigation management secondary radar, therefrom select the best main lobe pulse of the maximum main lobe pulse of performance number, thereby obtained the complete information data of target navigation management secondary radar as navigation management secondary radar.
S5. result's output.After accomplishing above-mentioned steps S1, S2, S3 and S4, just can the complete information data of isolated target navigation management secondary radar be exported through output device.
Through actual test; Navigation management secondary radar adopts any pattern in six kinds of interrogation modes (be respectively 1,2,3/A, B, C, D pattern); All can adopt method of the present invention effectively to be implemented; Those of ordinary skill in the art can according to the prompting of present embodiment conspicuous in various interrogation modes therefore embodiment of the present invention, enumeration no longer.
Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that the protection domain of inventing is not limited to such special statement and embodiment.Every making according to foregoing description variously possible be equal to replacement or change, and all is considered to belong to the protection domain of claim of the present invention.
Claims (4)
1. the anti-interference processing method based on navigation management secondary radar test system is characterized in that, may further comprise the steps:
S1. raw data initialization: the system data to navigation management secondary radar test system carries out initialization process;
S2. dynamic threshold sliding window detects: from the pulse signal that navigation management secondary radar functional test analyser receives, extract effective pulse signal sequence;
S3. remove asynchronous interference pulse signals: to the effective pulse signal sequence of extracting among the step S2, remove asynchronous interference pulse signals wherein, obtain the effective pulse signal sequence of target navigation management secondary radar;
S4. pulse is divided into groups: the effective pulse signal sequence of the target navigation management secondary radar that step S3 is obtained is carried out pulse and is divided into groups, and obtains the complete information data of target navigation management secondary radar;
S5. result's output: the complete information data of isolated target navigation management secondary radar are handled and exported through output device.
2. a kind of anti-interference processing method based on navigation management secondary radar test system according to claim 1 is characterized in that, below said step S2 has comprised again step by step:
S21. dynamic gate limit value (threshold) confirms;
S22. effective impulse location determination;
S23. the rising edge of slip scan effective impulse and negative edge;
S24. accurately extract the position and the width of effective impulse;
S25. calculate the accurate amplitude of effective impulse.
3. a kind of anti-interference processing method based on navigation management secondary radar test system according to claim 1 is characterized in that, below said step S3 has comprised again step by step:
S31. appoint and get an effective impulse signal;
S32. judge whether to be asynchronous interference pulse, if not, then jump directly to next step; Otherwise, jump directly to next effective impulse signal, continue this step;
S33. recording storage is the effective impulse signal of target navigation management secondary radar;
Circulation is carried out above-mentioned steps S32, S33 effective impulse signal judgement to the last and is finished.
4. a kind of anti-interference processing method based on navigation management secondary radar test system according to claim 1 is characterized in that, below said step S4 has comprised again step by step:
S41.P1/P3, P2 DISCHARGE PULSES EXTRACTION, P1/P3 is the main lobe pulse, the P2 side-lobe pulse;
S42. best main lobe extracts; According to the main lobe pulse information of navigation management secondary radar, therefrom select the best main lobe pulse of the maximum main lobe pulse of performance number, thereby obtained the complete information data of target navigation management secondary radar as navigation management secondary radar.
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| CN102798846B (en) * | 2012-08-20 | 2014-04-09 | 中国电子科技集团公司第十研究所 | Method for measuring parameters of secondary radar echo pulses |
| CN102928823B (en) * | 2012-10-30 | 2014-03-12 | 四川九洲空管科技有限责任公司 | Sea clutter suppressing method based on relevant characteristic of secondary radar answering signal |
| CN105577479B (en) * | 2016-01-25 | 2019-10-15 | 四川九洲电器集团有限责任公司 | A kind of environment inquiry method and aviation management inquire equipment |
| CN107102321B (en) * | 2017-06-01 | 2020-08-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Protection device of pulse secondary radar equipment under multi-pulse environment |
| CN107390034B (en) * | 2017-06-28 | 2019-01-08 | 北京金风科创风电设备有限公司 | The analysis method and device of impulse waveform amplitude variation |
| CN108680904A (en) * | 2018-05-02 | 2018-10-19 | 深圳市华讯方舟雷达技术装备有限公司 | A kind of suppressing method of marine navigation radar co-channel interference |
| CN110531361B (en) * | 2018-05-24 | 2022-09-16 | 凌宇科技（北京）有限公司 | Signal processing method and device and computer readable storage medium |
| CN112285653B (en) * | 2020-10-14 | 2024-04-26 | 广州极飞科技股份有限公司 | Signal interference elimination method, device, millimeter wave radar module, equipment and medium |
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