KR102073360B1 - Pulse tracking device with pulse repetition period switching detection function and pulse tracking method - Google Patents

Abstract

Embodiments provide a pulse tracking device and method for generating and transmitting a jamming signal appropriate to a threat pulse by real-time tracking a pulse of a threat whose pulse repetition period is changed, and the pulse repetition period of the threat is maintained at a constant value. If the value is changed to another value, the pulse can be quickly tracked to the changed value, and the pulse can be continuously tracked while the change point is detected to quickly synchronize and track the new pulse repetition cycle.

Description

Pulse tracking device with pulse repetition period switching detection function and pulse tracking method}

Embodiments relate to a pulse tracking apparatus and method having a pulse repeat cycle switching detection function.

The radar transmits a pulse signal, receives its own signal reflected back to the target, and estimates the distance, speed, and angle to the target. The signal transmitted from the radar is transmitted at a predetermined pulse repetition interval (hereinafter referred to as PRI). Modern radar modifies the pulse repetition period to solve the ambiguity problem in estimating the velocity or position of the target. By changing the pulse repetition period, it is possible to effectively respond to the electronic attack of jammers who deceive jamming. One of radar pulse repetition period changing techniques, dwell and switching pulse repetition period, generally has N dwell values and N pulse repetition period values corresponding to the number of dwells. 1 is an exemplary diagram of a dwell and switching pulse repetition period changing technique having three pulse repetition periods.

Typical jammers can generate and transmit noise jamming and deceptive jamming signals. Noise jamming is used to reduce the reception sensitivity of the target detection radar, and deception jamming sends a deception signal to the tracking radar to prevent the target from being properly tracked. In order to generate a deceptive jamming signal, the jammer needs to synchronize its jamming signal with the pulse signal transmitted by the radar to increase the effect of jamming. To this end, the jammer transmits a jamming signal at a desired time after synchronizing the radar signal received by the pulse tracking device with the jamming signal generated by the jammer.

Most radars today use PRI changing techniques such as staggers, jitter, and dwell and switch rather than fixed pulse repetition periods. Threats that change the PRI should be motivated at the point when the pulse tracking device changes first, and then be able to track continuously. In the case of dwell and switch, if the time for which one PRI is repeated is short, the ratio of time of tracking pulses is relatively shortened due to frequent synchronization, tracking, and resynchronization of the pulse tracking device. The effectiveness of jamming is lowered.

[Prior art document number]

Prior Art Document 1: Korean Patent Registration No. 10-1759618

Prior Art Document 2: Korean Patent No. 10-0680031

Embodiments provide a pulse tracking apparatus and method for generating and transmitting a jamming signal appropriate to a threat pulse by real-time tracking a pulse of a threat whose pulse repetition period is changed.

In addition, if the pulse repetition period of the threat is changed to another value while maintaining a constant value, the pulse can be quickly tracked according to the changed value, and the new pulse repetition period is detected by continuously tracking the pulse and detecting the point of change. To provide a pulse tracking device and method that can be quickly synchronized and tracked.

A pulse tracking device having a pulse repetition period switching detection function, the pulse tracking device comprising: a pulse information generation unit configured to measure an arrival time of a pulse signal of a received radar; A synchronization unit performing synchronization based on the arrival time, and detecting continuous pulse information based on a time, a minimum pulse repeat period value, and a maximum pulse repeat period value of the first detected pulse after performing the synchronization; And whether the pulse repetition period is switched by determining whether the front pulse and the rear pulse are detected and whether the pulse is missing based on the detection time of the current input pulse, the minimum pulse repetition period value, the maximum pulse repetition period value, and the continuous pulse information. It includes a tracking unit for detecting.

The synchronization unit may perform resynchronization based on a detection time of the front pulse when the change of the pulse repetition period is detected by the tracking unit.

When the number of missing pulses in the tracker is greater than or equal to a threshold value, the synchronizer may determine that the track fails and perform resynchronization based on the current input pulse.

The tracking unit may determine that the pulse repetition period is switched when a pulse drop occurs and one of the front pulse and the rear pulse is detected.

A pulse tracking method having a pulse repetition period switching detection function according to another embodiment, the method comprising: generating pulse information for measuring an arrival time of a pulse signal of a radar received; A synchronization step of performing synchronization based on the arrival time, and detecting continuous pulse information based on a time, a minimum pulse repeat period value, and a maximum pulse repeat period value of the first detected pulse after performing the synchronization; And whether the pulse repetition period is switched by determining whether the front pulse and the rear pulse are detected and whether the pulse is missing based on the detection time of the current input pulse, the minimum pulse repetition period value, the maximum pulse repetition period value, and the continuous pulse information. It includes a tracking step of detecting.

In the synchronizing step, when switching of the pulse repetition period is detected, resynchronization may be performed based on a detection time of the front pulse.

In the synchronizing step, when the number of missing pulses is equal to or greater than a threshold value, the synchronization failure may be determined as a tracking failure, and resynchronization may be performed based on a current input pulse.

The tracking step may determine that the pulse repetition period is switched when a pulse drop occurs and one of the front pulse and the rear pulse is detected.

Another embodiment includes a recording medium recording a program for executing a pulse tracking method in a computer.

The pulse tracking apparatus and method according to the embodiment can quickly track the pulse according to the changed value when the pulse repetition period of the threat is changed to another value while maintaining a constant value.

In addition, the pulses can be continuously tracked and detected at the same time to be changed to quickly synchronize and track the new pulse repetition cycle.

1 is an exemplary diagram of dwell and switching pulse repetition periods.
2 is a schematic diagram of a pulse tracking device 10 according to an embodiment.
3 is a schematic diagram of the synchronization unit 200 shown in FIG. 2.
4 is a schematic diagram of the tracking unit 300 shown in FIG. 2.
5 is an exemplary diagram of a dwell and switch signal according to an embodiment.
6 is a diagram illustrating a result of tracing the dwell and switch signal of FIG. 5 using a pulse tracking device according to an exemplary embodiment.

The terminology used in the present embodiments is a general term that is currently widely used as possible while considering the functions in the present embodiments, but may vary according to the intention or precedent of a person skilled in the art, the emergence of new technology, etc. . In addition, in certain cases, there is also a term arbitrarily selected, and in this case, the meaning will be described in detail in the description of the corresponding embodiment. Therefore, the terms used in the present exemplary embodiments should be defined based on the meanings of the terms and the contents of the present exemplary embodiments rather than the names of the simple terms.

In the description of the embodiments, when a part is connected to another part, this includes not only a case in which the part is directly connected, but also a case in which another part is electrically connected in between. In addition, when a part includes a certain component, this means that it may further include other components, without excluding other components unless otherwise stated. In addition, the term “... unit” described in the embodiments refers to a unit for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software.

Terms such as “consisting of” or “comprising” as used in the present embodiments should not be construed as necessarily including all of the various components or steps in the specification, and some or some of them It is to be understood that the steps may not be included or may further include additional components or steps.

The description of the following embodiments should not be construed as limiting the scope of the right, it should be construed as belonging to the scope of the embodiments that can be easily inferred by those skilled in the art. Hereinafter, only exemplary embodiments will be described in detail with reference to the accompanying drawings.

2 is a schematic diagram of a pulse tracking device 10 according to an embodiment.

Referring to FIG. 2, the pulse tracking device 10 includes a pulse information generation unit 100, a synchronization unit 200, and a tracking unit 300 to perform synchronization and tracking. The pulse information generation unit 100 generates information by measuring pulse arrival time, frequency, pulse amplitude, and the like. The synchronization unit 200 performs a process of synchronizing to the pulse of the jamming target threat by using the pulse repeat cycle information. The tracking unit 300 generates a prediction gate for the synchronized threat pulse. In general, jammers perform synchronization and tracking processes using pulse repetition period values analyzed by electronic support equipment. Information provided by the electronic support equipment includes information such as pulse repeat cycle value, minimum pulse repeat cycle, maximum pulse repeat cycle, and pulse width for each dwell. The level of information provided may vary depending on the performance of the electronic support equipment. The pulse tracking apparatus 10 according to the embodiment may generate and transmit a jamming signal suitable for the threat pulse by tracking the pulse of the threat whose pulse repetition period is changed in real time. In an embodiment, a pulse tracking apparatus and method for effectively jamming a radar using dwell and switching pulse repetition period signals are described. In an embodiment, the minimum pulse repetition period value and the maximum pulse repetition period value of the dwell and switching pulse repetition period signals analyzed by the electronic support equipment are used.

The pulse arrival time, frequency, and amplitude of the radar pulse signal received by the pulse information generation unit 100 are measured for each pulse and transmitted to the synchronization unit 200. Information used in the synchronization unit 200 and the tracking unit 300 is the pulse arrival time.

The synchronization unit 200 performs synchronization using the pulse arrival time information. The synchronization unit 200 may include an initialization unit 201, a pulse detector 202, and a continuous pulse detector 203. 3 is a schematic diagram of the synchronization unit 200 shown in FIG. 2.

Referring to FIG. 3, the synchronizer 200 may include an initializer 201, a pulse detector 202, and a continuous pulse detector 203.

In the initialization unit 201, the synchronization completion flag Sync_ok and the resynchronization flag Re_Sync are initialized to zero before the pulse synchronization process. In addition, PRI_min and PRI_max values are calculated by the following equations (1) and (2).

[Equations 1 and 2]

PRI_min = ceil (min (PRI)-min (PRI) × σ / 100) (1)

PRI_max = floor (max (PRI) + max (PRI) × σ / 100) (2)

Where σ is the PRI tracking error. PRI_min and PRI_max can be defined using the ceil and floor functions.

을 측정한다.The pulse detector 202 is the time of the first detected pulse after the synchronization process starts

Measure

시간 내에 펄스가 존재할 경우 펄스 검출 시간

The continuous pulse detector 203 starts from the time when the pulse is detected in the pulse detection.

Pulse detection time if pulse exists within time

내에 펄스가 검출되면 펄스 검출 시간

을 측정하고 Re_Sync=0의 상태를 유지한다. 펄스가 검출되지 않을 경우 Re_Sync=1이며 펄스검출 과정을 다시 수행한다. Re_Sync=0이면 Sync_ok=1로 동기 과정이 완료된다.

로 연산된다. 동기 과정이 완료되면 펄스 추적 과정이 수행되며, 시간상으로

이후의 과정일 수 있다. Measure and keep Re_Sync = 0. If no pulse is detected, Re_Sync = 1 and repeat the pulse detection process. If Re_Sync = 0,

Pulse detection time if pulse is detected within

Measure and keep Re_Sync = 0. If no pulse is detected, Re_Sync = 1 and repeat the pulse detection process. If Re_Sync = 0, the synchronization process is completed with Sync_ok = 1.

Is calculated as When the synchronization process is complete, the pulse tracking process is performed.

It may be a subsequent process.

4 is a schematic diagram of the tracking unit 300 shown in FIG. 2. The tracking unit 300 according to an embodiment includes an initialization unit 301, a front pulse detection unit 302, a tracking pulse detection unit 303, a rear pulse detection unit 304, a PRI conversion tracking unit 305, and a tracking state checking unit ( 306). If the PRI is changed, if the PRI is shorter than the previous PRI, the pulse is detected at a time point closer to the pulse detection position predicted based on the current PRI (front pulse). It is detected (rear pulse). In an embodiment, it may be determined by checking whether the PRI is changed by checking whether the front and rear pulses are detected and whether or not the pulse is missed at the predicted point. The pulse tracking device according to the embodiment may detect a time point at which the PRI is switched and resynchronize based on this time point to quickly track a threat pulse.

Referring back to FIG. 4, the initialization unit 301 initializes the states of the front pulse detection flag DF and the rear pulse detection flag DR to zero.

기준으로

의 조건을 만족할 경우 전방펄스가 검출된 것으로 판단하며, 이때 DF=1이며 펄스 검출 시간은

이다.The front pulse detector 302 detects the pulse of the pulse immediately before the detection time ti of the i-th (i> 3) input pulse.

Based

If the condition is satisfied, it is determined that the front pulse has been detected. In this case, DF = 1 and the pulse detection time is

to be.

의 구간으로 생성되며, 이 조건을 만족하는 경우 count=0이 된다. 만약 조건을 만족하는 펄스가 검출되지 않을 경우 count=1이 되어 누락펄스가 검출된 것으로 판단한다. 이후 i+1번째 펄스 검출 시간에서

의 조건을 만족할 경우 누락펄스에 대한 예외처리를 수행하여 DF=0이 된다. 예외처리는 위협의 펄스가 아닌 간섭 펄스가 입력되었을 경우에 대한 영향을 제거할 수 있다.The tracking pulse detector 303 is a process of detecting whether there are missing pulses while generating a prediction gate for a pulse repeating cycle of the current dwell. The predictive gate for the i th pulse is based on the time of the i-1 th pulse.

It is generated with the interval of and if this condition is met, count = 0. If a pulse that satisfies the condition is not detected, count = 1 and it is determined that a missing pulse is detected. Then at the i + 1th pulse detection time

If the condition is satisfied, exception processing for missing pulses is performed, resulting in DF = 0. Exception handling can eliminate the impact of an interference pulse that is not a threat pulse.

가 바로 전 펄스의 검출 시간

기준으로

의 조건을 만족할 경우 후방펄스가 검출된 것으로 판단하며, 이때 DR=1이며 펄스 검출 시간은

이다.The rear pulse detector 304 detects an i-th (i> 3) input pulse.

Time for the pulse just before

Based

If the condition is satisfied, it is determined that the rear pulse has been detected. In this case, DR = 1 and the pulse detection time is

to be.

을 기준으로 DR=1인 경우

을 기준으로 동기화과정이 수행된다. In the case of count = 1 in the tracking pulse detection, the PRI conversion tracking unit 305 determines that the pulse by the previous PRI prediction has not been detected, and in this case, when the front or rear pulse is detected, the PRI is changed. Therefore, if count = 1 and DF = 1 or DR = 1, PRI conversion tracking is performed. This is to perform the synchronization process again. If DF = 1

DR = 1 based on

Based on the synchronization process is performed.

The tracking status checking unit 306 determines that the tracking failure occurs when the missing pulse occurs three times (count = 3) in the tracking pulse detection process. Sync_ok = 0, count = 0, DF = 0, DR = 0, Re_sync = 1, and then repeat the synchronization process. Here, the description is based on three times, but the present invention is not limited thereto and may be arbitrarily set according to the performance and application of the pulse tracking device.

5 is an exemplary diagram of a dwell and switch signal according to an embodiment. 6 is a diagram illustrating a result of tracing the dwell and switch signals of FIG. 5 using a pulse tracking device according to an exemplary embodiment.

5 and 6, the results of the simulation of the dwell and switch signal PRI consisting of 141us, 111us, 123us, 98us, 136us. The number of pulses per dwell is 20, and sigma is 1us. Synchronization start time is 20us. Interference pulses are 412us and 3569us.

5 is a dwell and switch pulse train consisting of five PRIs and an interference signal. 6 shows synchronization and tracking results for each dwell PRI. If the PRI of the next dwell is longer than the PRI of the current dwell, up to five pulses are required for tracking. In addition, the pulse tracking apparatus and method according to the embodiment can be synchronized and tracked using only PRI_min and PRI_max information, so that information on the order of PRI is not required. From the example of PRI = 111us, it can be seen that continuous tracking is possible even if an interference signal occurs in the tracking process after completion of synchronization.

One embodiment of the present invention can also be implemented in the form of a recording medium containing instructions executable by a computer, such as a program module executed by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transmission mechanism, and includes any information delivery media.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Claims (9)

In the pulse tracking device having a pulse repeat cycle switching detection function,
A pulse information generator for measuring an arrival time of a received pulse signal of a radar;
A synchronization unit performing synchronization based on the arrival time, and detecting continuous pulse information based on a time, a minimum pulse repeat period value, and a maximum pulse repeat period value of the first detected pulse after performing the synchronization; And
On the basis of the detection time of the current input pulse, the minimum pulse repetition period value, the maximum pulse repetition period value and the continuous pulse information, it is determined whether the pulse repetition period is switched by determining whether the front pulse and the rear pulse are detected or not. Including a tracking unit for detecting,
The synchronization unit,
And re-synchronizing on the basis of the detection time of the front pulse when the change of the pulse repetition period is detected by the tracking unit. delete The method of claim 1,
The synchronization unit,
The pulse tracking device, if the number of missing pulses in the tracking unit is greater than or equal to a threshold value, determine that the tracking failure, and re-synchronization based on the current input pulse. The method of claim 1,
The tracking unit,
The pulse tracking device, characterized in that it is determined that the pulse repetition period is switched when a pulse missing occurs, either one of the front pulse or the rear pulse is detected. In the pulse tracking method having a pulse repeat cycle switching detection function,
Generating pulse information for measuring the arrival time of the pulse signal of the received radar;
A synchronization step of performing synchronization based on the arrival time, and detecting continuous pulse information based on a time, a minimum pulse repeat period value, and a maximum pulse repeat period value of the first detected pulse after performing the synchronization; And
On the basis of the detection time of the current input pulse, the minimum pulse repetition period value, the maximum pulse repetition period value and the continuous pulse information, it is determined whether the pulse repetition period is switched by determining whether the front pulse and the rear pulse are detected or not. A tracking step of detecting,
The synchronization step,
And when the switching of the pulse repetition period is detected, resynchronization is performed based on the detection time of the front pulse. delete The method of claim 5, wherein
The synchronization step,
If the number of missing pulses is greater than or equal to the threshold, it is determined that the tracking failure, and re-synchronization based on the current input pulse. The method of claim 5, wherein
The tracking step,
And a pulse repetition period is determined to be switched when a pulse drop occurs and one of the front pulse and the rear pulse is detected. A recording medium having recorded thereon a program for executing a pulse tracking method according to any one of claims 5 and 7 to a computer.

Images