KR20190085677A - 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 jamming signals suitable for a threat pulse by tracking, in real time, the pulse of a threat in which a pulse repetition cycle is changed. When the pulse repetition cycle of the threat is kept constant and then changed to another value, the pulse can be quickly tracked to match the changed value. The pulse can be continuously tracked and a changed point is detected at the same time, thereby enabling quick synchronization and tracking in a new pulse repetition cycle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse tracking apparatus and a pulse tracking method,

Embodiments relate to a pulse tracking apparatus and method having a pulse repetition period switching detection function.

The radar transmits a pulse signal, receives its own signal reflected on the target, and estimates distance, velocity, and angle with the target. The signal transmitted from the radar is transmitted as a Pulse Repetition Interval (PRI). Modern radars change the pulse repetition period to solve the ambiguity problem that arises in estimating the velocity or position of the target. Also, by changing the pulse repetition period, it is possible to effectively cope with an electronic attack of a jammer who is jamming. The dwell and the switching pulse repetition period, which is one of the pulse repetition period changing methods of the radar, generally have N pulse repetition period values corresponding to the number of N dwells and dwells. 1 is an exemplary diagram of a dwell and a switching pulse repetition period changing technique having three pulse repetition periods.

A typical jammer 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 tracking properly. The jammer can transmit the jamming signal to the pulse signal transmitted by the radar in order to generate the jamming signal, so that the jamming effect can be enhanced. For this purpose, a jammer uses a pulse tracking device to synchronize a received radar signal with a self-generated jamming signal, and then transmits a jamming signal at a desired time.

Current radars use PRI techniques such as stagger, jitter, dwell and switch instead of fixed pulse repetition period. The threat of changing the PRI should be synchronized to the point in time when the pulse tracer is first changed and then be continuously traceable. In the case of a dwell and switch, if the repetition time of one PRI is short, the rate of tracking the pulse is relatively short due to frequent synchronization, tracking, and re-synchronization of the pulse tracking device, The effect of jamming is reduced.

[Prior Art Document Number]

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

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

Embodiments provide a pulse tracking apparatus and method for real-time tracking a pulse of a threat whose pulse repetition period is changed to generate and transmit an appropriate jamming signal to the threat pulse.

In addition, if the threat repetition period is maintained at a constant value and then changed to another value, it is possible to track the pulse quickly in accordance with the changed value, to continuously track the pulse, And to provide a pulse tracking apparatus and method capable of quickly synchronizing and tracking the pulse traces.

A pulse tracking device having a pulse repetition period switching detection function according to an embodiment of the present invention includes: a pulse information generation unit for measuring arrival time of a pulse signal of a received radar; A synchronization unit for performing synchronization based on the arrival time and detecting continuous pulse information based on a time of the first pulse detected after the synchronization, a minimum pulse repetition period value, and a maximum pulse repetition period value; And whether or not the detection of the forward pulse and the backward pulse and the absence of the pulse are determined 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, And a tracking unit for detecting the position of the vehicle.

The synchronization unit may perform resynchronization based on the detection time of the forward pulse when the tracking unit detects the switching of the pulse repetition early.

When the number of missing pulses in the tracking unit is equal to or greater than the threshold value, the synchronization unit determines that the tracking is failed and resynchronizes based on the current input pulse.

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

A pulse tracking method having a pulse repetition period switching detection function according to another embodiment, the pulse tracking method comprising: a pulse information generation step of measuring arrival time of a pulse signal of a received radar; A synchronization step of performing synchronization based on the arrival time and detecting continuous pulse information based on a time of the first pulse detected after the synchronization, a minimum pulse repetition period value, and a maximum pulse repetition period value; And whether or not the detection of the forward pulse and the backward pulse and the absence of the pulse are determined 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, And a tracking step of detecting the moving image.

The synchronization step may perform resynchronization based on the detection time of the forward pulse when the switching of the pulse repetition early period is detected.

In the synchronization step, if the number of missing pulses is equal to or greater than the threshold value, it is determined that the tracking is unsuccessful, and resynchronization can be performed based on the current input pulse.

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

And a recording medium on which a program for causing a computer to execute the pulse tracking method according to another embodiment is recorded.

The pulse tracing 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 maintained at a constant value and then changed to another value.

In addition, it is possible to continuously track the pulse, detect the point of change, and quickly synchronize and track the new pulse repetition period.

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

Although the terms used in the present embodiments have been selected in consideration of the functions in the present embodiments and are capable of being widely used in general terms, they may vary depending on the intention or circumstance of a technician working in the art, the emergence of new technology . Also, in certain cases, there are arbitrarily selected terms, and in this case, the meaning will be described in detail in the description part of the embodiment. Therefore, the terms used in the embodiments should be defined based on the meaning of the terms, not on the names of simple terms, and on the contents of the embodiments throughout.

In the description of the embodiments, when a part is connected to another part, it includes not only a direct connection but also a case where the part is electrically connected with another part in between. In addition, when a part includes an element, it does not exclude other elements unless specifically stated otherwise, but may include other elements. Further, the term " part " described in the embodiments means 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.

The terms " comprising " or " comprising ", etc. used in the embodiments should not be construed as necessarily including the various elements described in the specification or the various steps, Steps may not be included, or may be interpreted to include additional components or steps.

The following description of the embodiments should not be construed as limiting the scope of the present invention and should be construed as being within the scope of the embodiments of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Exemplary embodiments will now be described in detail with reference to the accompanying drawings.

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

Referring to FIG. 2, the pulse tracking apparatus 10 includes a pulse information generator 100, a synchronization unit 200, and a tracking unit 300 to perform synchronization and tracking. The pulse information generation unit 100 measures information such as pulse arrival time, frequency, pulse amplitude, and the like. The synchronization unit 200 performs synchronization with the pulse of the jamming target threat using the pulse repetition period information. The tracking unit 300 generates a prediction gate for the synchronized threat pulse. Generally, the jammers perform the synchronization process and the tracking process using the pulse repetition period value analyzed in the electronic support equipment. The information provided by the electronic support equipment includes information such as the pulse repetition period value per dwell, the minimum pulse repetition period, the maximum pulse repetition period, and the pulse width, and the level of information provided may vary depending on the performance of the electronic supporting equipment. The pulse tracing apparatus 10 according to the embodiment can generate a jamming signal suitable for the threat pulse by real-time tracking the pulse of the threat whose pulse repetition period is changed. In an embodiment, a pulse tracking apparatus and method for effectively jamming a radar using dwell and switch pulse repetition period signals is described. In an embodiment, the minimum pulse repetition period value and the maximum pulse repetition period value of the dwell and the switching pulse repetition period signal analyzed in the electronic support equipment are used.

Frequency, and amplitude of the radar pulse signal received by the pulse information generating unit 100 for each pulse, and transmits the pulse arrival time, frequency, and amplitude to the synchronizing unit 200. [ The information used in the synchronization unit 200 and the tracking unit 300 is pulse arrival time.

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

Referring to FIG. 3, the synchronization unit 200 may include an initialization unit 201, a pulse detection unit 202, and a continuous pulse detection unit 203.

In the initialization unit 201, the synchronization completion flag Sync_ok and the resynchronization flag Re_Sync are initialized to 0 before the pulse synchronization process. Also, the values of PRI_min and PRI_max are calculated by the following equations (1) and (2).

[Mathematical Formulas 1 and 2]

PRI_min = ceil (min (PRI) - min (PRI) 占 / 100) (1)

PRI_max = floor (max (PRI) + max (PRI) 占 / 100) (2)

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

을 측정한다.The pulse detecting unit 202 detects the time of the first detected pulse after the synchronization process is started

.

시간 내에 펄스가 존재할 경우 펄스 검출 시간

The continuous pulse detecting section 203 detects the continuous pulse from the time when the pulse is detected in the pulse detection

If there is a pulse within the time, the pulse detection 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. And keeps Re_Sync = 0. If no pulse is detected, Re_Sync = 1 and the pulse detection process is performed again. When Re_Sync = 0,

When a pulse is detected within the pulse detection time

And keeps Re_Sync = 0. If no pulse is detected, Re_Sync = 1 and the pulse detection process is performed again. If Re_Sync = 0, the synchronization process is completed with Sync_ok = 1.

. When the synchronization process is completed, the pulse tracing process is performed.

This can be a later process.

4 is a schematic diagram of the tracking unit 300 shown in FIG. The tracking unit 300 according to the 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, 306). If the PRI is changed, if the PRI is shorter than the previous PRI, the pulse is detected at a point closer in time than the predicted pulse detection position based on the current PRI (forward pulse). If the changed PRI is long, (Backward pulse). In the embodiment, it is possible to determine whether the PRI is changed by checking whether the forward and backward pulses are detected or not, and checking whether the pulse is missing at the predicted point. The pulse tracing apparatus according to the embodiment can detect the point in time when the PRI is switched and trace the threat pulse promptly by resynchronizing with the point of time.

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 determines whether the detection time ti of the i-th (i > 3)

Based

It is determined that the forward pulse is detected, and at this time, 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 generates a prediction gate for the pulse repetition period of the current dwell and detects whether there is a missing pulse. The prediction gate for the i-th pulse is based on the time of the (i-1)

And count = 0 if this condition is satisfied. If a pulse satisfying the condition is not detected, count = 1, and it is judged that a missing pulse is detected. Then, at the (i + 1) -th pulse detection time

, The exception processing for the missing pulse is performed to obtain DF = 0. Exception handling can eliminate the effect of interference pulses that are 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 backward pulse detection unit 304 detects the detection time of the i-th (i > 3)

The detection time of the immediately preceding pulse

Based

It is determined that a backward pulse is detected, and at this time, 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 previous PRI prediction is not detected, and if the forward or backward pulse is detected, the PRI switching unit 305 determines that the PRI has changed. Therefore, when count = 1 and DF = 1 or DR = 1, PRI conversion tracking is performed. This is to perform the synchronization process again. If DF = 1

If DR = 1 based on

The synchronization process is performed.

The tracking state checking unit 306 determines that the tracking failure has occurred when the missing pulse has occurred three times (count = 3) in the tracking pulse detection process. Sync_ok = 0, count = 0, DF = 0, DR = 0, Re_sync = 1, and then performs the synchronization process again. Here, although the description has been made based on three times, it is needless to say that the present invention is not limited to this, and it can be arbitrarily set according to the performance and application of the pulse tracing apparatus.

5 is an exemplary illustration of a dwell and switch signal according to one embodiment. FIG. 6 is a diagram illustrating the result of tracking the dwell-and-switch signal of FIG. 5 using the pulse tracking apparatus according to an embodiment.

Referring to FIGS. 5 and 6, simulation results of a dwell and switch signal composed of 141us, 111us, 123us, 98us and 136us are shown. The number of pulses per dwell is 20, and? Is 1us. The synchronization start time is 20us. The interference pulse is 412 us, 3569 us.

FIG. 5 shows a dwell-and-switch pulse train composed of five PRIs and an interference signal. FIG. 6 shows the result of synchronizing and tracking for each dwell-specific PRI. If the PRI of the next dwell is longer than the PRI of the current dwell, a maximum of five pulses are required for tracking. Also, the pulse tracing apparatus and method according to the embodiment can perform synchronization and tracking using only PRI_min and PRI_max information, and information on the order of PRI is not required. From the example of the case of PRI = 111us, it can be confirmed that continuous tracking is possible even if an interference signal is generated in the tracking process after completion of synchronization.

One embodiment of the present invention may also be embodied in the form of a recording medium including instructions executable by a computer, such as program modules, being executed by a 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, the computer-readable medium 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 any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (9)

A pulse tracking apparatus having a pulse repetition period switching detection function,
A pulse information generation unit for measuring arrival time of a pulse signal of a received radar;
A synchronization unit for performing synchronization based on the arrival time and detecting continuous pulse information based on a time of the first pulse detected after the synchronization, a minimum pulse repetition period value, and a maximum pulse repetition period value; And
Whether or not the detection of the forward pulse and the backward pulse is detected 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, And a tracking section for detecting the pulse tracing section. The method according to claim 1,
Wherein the synchronization unit comprises:
Wherein the re-synchronization unit performs re-synchronization based on the detection time of the forward pulse when the switching unit detects the switching of the pulse repetition early. 3. The method of claim 2,
Wherein the synchronization unit comprises:
Wherein when the number of missing pulses is equal to or greater than a threshold value, the tracking unit determines that tracking is unsuccessful and resynchronizes based on the current input pulse. The method according to claim 1,
The tracking unit includes:
And when it is detected that one of the forward pulse and the backward pulse is detected, it is determined that the pulse repetition period has been switched. A pulse tracking method having a pulse repetition period switching detection function,
A pulse information generation step of measuring arrival time of a 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 of the first pulse detected after the synchronization, a minimum pulse repetition period value, and a maximum pulse repetition period value; And
Whether or not the detection of the forward pulse and the backward pulse is detected 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, And a tracking step of detecting the pulse tracing step. 6. The method of claim 5,
The synchronization step comprises:
Wherein the resynchronization is performed based on the detection time of the forward pulse when the switching of the pulse repetition early period is detected. The method according to claim 6,
The synchronization step comprises:
Wherein when the number of missing pulses is equal to or greater than a threshold value, it is determined that the tracking is unsuccessful, and resynchronization is performed based on the current input pulse. 6. The method of claim 5,
Wherein the tracking step comprises:
And when it is detected that one of the forward pulse and the backward pulse is detected, it is determined that the pulse repetition period has been switched. A recording medium on which a program for causing a computer to execute the pulse tracking method according to any one of claims 5 to 8 is recorded.

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