KR101765239B1

KR101765239B1 - Method and Apparatus for eliminating false detected Pulse Description Word due to short pulse caused by inter-channel interference in broadband multi-channel receiver

Info

Publication number: KR101765239B1
Application number: KR1020150115589A
Authority: KR
Inventors: 박범준; 박병구; 김종규; 이동원; 김영민; 김상원
Original assignee: 국방과학연구소
Priority date: 2015-08-17
Filing date: 2015-08-17
Publication date: 2017-08-14
Also published as: KR20170021150A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband multi-channel receiver, and more particularly, to a broadband multi-channel digital receiver (ES) system for receiving a radar signal and generating a pulse description word A method and an apparatus for removing these false-positive PDWs occur when a problem that short-pulse is detected due to a strong signal flowing into an adjacent channel due to channel interference when a large radar pulse signal is input is detected.

Description

FIELD OF THE INVENTION The present invention relates to a method and an apparatus for eliminating a false-positive short pulse PDW due to inter-channel interference in a broadband multi-channel receiver,

An electronic warfare receiver is a system for detecting / identifying radar signals in a high-density electromagnetic signal environment. For the detection / identification, the electronic warfare receiver generates a PDW by measuring a signal received from various orientations in real time in a pulse unit variable specification in order to receive a radar signal operating in a band of interest in a wide band.

Generally, a broadband multichannel digital receiver for electronic warfare support has a reception bandwidth of several hundreds MHz to several GHz as a whole, and is composed of several channels of several tens of MHz internally.

When a radar signal with a high pulse intensity is input to a specific channel, such a wideband channelization receiver may generate several tens of nanoseconds (ns) near the leading edge (LE) and the trailing edge (TE) nano second) may be generated to generate a PDW (Pulse Description Word).

Generally, the flow of electronic signal support signal processing consists of three steps: PDW acquisition, signal analysis, and signal identification. If these false positive PDWs are given as inputs to the signal analysis / identification process after the PDW collection phase with normal PDWs, false analysis and misidentification problems may occur. Therefore, even if the PDWs are not generated or generated by hardware, these false PDWs can be expected to be processed in a signal analysis pre-processing step in a software manner so that a reliable signal processing process can be expected.

1. Korean Patent No. 100979294 2. Korean Patent Publication No. 10-2010-0124986

It is an object of the present invention to provide a method and apparatus for eliminating false detection short PDWs by hardware and / or software elimination of false detection PDWs.

The present invention provides a method for eliminating false detection short pulse PDWs by hardware and / or software removal of false detection PDWs in order to achieve the above problems.

The method of removing the false positive short pulse PDW includes:

A method for removing false positive short pulse PDW (Pulse Description Word) due to interchannel interference in a wideband multi-channel receiver,

(a) receiving radar signals;

(b) converting the radar signal into intermediate frequency signals;

(c) generating pulse description words (PDW) through the intermediate frequency signals using preset collection strategy information (reception threshold, etc.);

(d) analyzing and identifying the corresponding PDWs among the PDWs according to a preset condition table as the detected PDWs, removing the PDWs from which the false PDWs are removed; And

(e) displaying the result of the analysis and identification.

The PDW may include a pulse frequency, a pulse width, a pulse intensity, a pulse arrival time, a pulse arrival azimuth, and a polarity.

In order to analyze and identify a radar signal of interest using the screen displayed on the display unit, the collection strategy information may include a frequency range of interest, a bandwidth of the broadband multi-channel receiver, A reception threshold value, a polarity of an antenna, a collection time, and a collection number.

In addition, the condition table may include pulse arrival time difference, pulse width difference, and pulse intensity difference.

In addition, the pulse arrival time difference may be a pulse arrival time difference relative to an LE time (LE) near a leading edge of a pulse signal, a pulse arrival time relative to a TE time relative to a TE (Trailing Edge) .

Here, the time unit of the pulse arrival time difference is nanoseconds (ns), the time unit of the pulse width difference is microseconds (μs), and the unit of the pulse intensity difference is dBm.

Alternatively, the acquisition strategy information may include control information for controlling the PDW generation unit so as not to generate the PDWs if the pulse width is within a predetermined threshold value for controlling the false PDWs in a hardware manner have.

The PDW generating unit may set control variables including pulse intensity, frequency, and pulse width to generate or delete the PDW corresponding to the predetermined condition, under the control of the display unit or the analysis identifying unit, And the PDW generating unit may generate or delete the PDW according to the specific condition.

On the other hand, another embodiment of the present invention is a radar apparatus comprising: an antenna unit for receiving radar signals; An RF (Radio Frequency) receiver for converting the radar signals into intermediate frequency signals; A PDW generation unit for generating pulse description words (PDW) through the intermediate frequency signals using pre-set acquisition strategy information; An analysis identification unit for determining and disposing corresponding PDWs among the PDWs according to a preset condition table as false detection PDWs and analyzing and identifying the PDWs from which the false detection PDWs have been removed; And a display unit for displaying the result of the analysis and the identification.

In this case, the PDW generator may be a wideband multi-channel receiver.

According to the present invention, false detection and misidentification problems may arise if false detection PDWs (Pulse Description Words) are given as inputs to the signal processing process after the PDW collection step together with normal PDWs. Therefore, such false- It can be expected that a highly reliable signal processing process can be expected.

Therefore, the present invention has the effect of deriving a reliable signal processing result by removing such a false-positive PDW.

1 is a block diagram illustrating a concept of an operator creating a collection strategy and collecting / analyzing / identifying a radar signal in the structure of an electronic warfare receiver according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a signal received in a 5-channel digital receiver according to an exemplary embodiment of the present invention. Referring to FIG.
FIG. 3 is an example of a condition table for judging and removing a false PDW (Pulse Description Word) according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating a process of configuring and controlling a collecting power of a radar signal according to an exemplary embodiment of the present invention. Referring to FIG.
FIG. 5 is a flowchart illustrating a process of receiving, analyzing, identifying, and displaying a radar signal according to FIG.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for removing a short pulse PDW (pulse description word) due to interchannel interference in a wideband multi-channel receiver according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a concept of an operator creating a collection strategy and collecting / analyzing / identifying a radar signal in the structure of an electronic warfare receiver according to an embodiment of the present invention. 1, the apparatus 100 for removing a false positive short pulse PDW includes an antenna 110 for receiving radar signals, a radio frequency (RF) receiver 120 for converting the radar signals into intermediate frequency signals, A PDW generating unit 130 for generating PDWs by measuring the intermediate frequency signals in the presence of a signal equal to or greater than the reception threshold value included in the preset setting information, An analysis identification unit 140 for analyzing and identifying the PDWs from which the false detection PDWs have been removed, and a GUI capable of creating a collection strategy, and providing a result of the analysis and identification And a display unit 150 for displaying images.

In particular, the analysis identifying unit 140 controls the RF (Radio Frequency) receiving unit 120 and / or the PDW generating unit 130 and analyzes and / or identifies the radar signal using the generated PDW.

In general, an operator controls the RF receiving unit 120 and the PDW generating unit 130 by configuring a collection strategy such as a band of a radar signal to be received using the display unit 150. When the radar signal is input through the antenna unit 110, PDWs are generated through the PDW generator 130, which is converted into an intermediate frequency through the RF receiver 120 and configured as a wideband multi-channel digital receiver. The generated PDWs read PDWs from the analysis identification unit 140, analyze and / or identify the radar signals, and display the results on the display unit 150.

When a signal having a very high signal intensity is input to the electronic support system, the signal is converted to an intermediate frequency through the RF receiver 120 and input to the PDW generator 130 in the form of a wideband channelization receiver do. When such a strong signal is introduced into a specific channel, a strong signal is introduced into the adjacent channel due to interference between channels, so that a short pulse is generated near the LE and TE points of the strong signal, and the PDW generating unit (S300) The short pulse may be detected as false. A diagram showing this is shown in Fig.

FIG. 2 is a diagram illustrating a signal received in a 5-channel digital receiver according to an exemplary embodiment of the present invention. Referring to FIG. Referring to FIG. 2, the x-axis 230 of each graph is the time axis and the y-axis 240 represents the signal intensity. Assuming that a radar signal having a very high signal intensity is introduced into the channel 3, the LE (Leading Edge) 210 of the pulse signal, which is input to the channel 3 from the channel 1, 2, It can be confirmed that a short pulse 201 is generated in the vicinity of the TE (Trailing Edge) 220 time point. This feature can be seen as a typical characteristic of a channelization receiver.

For this case, the analysis identifying unit 140 determines whether the signal intensity difference between the LE and TE signals having a strong signal intensity is within a preset threshold value and the pulse width is within a threshold value, The PDW is removed.

Alternatively, the operator may additionally set information (pulse width control information) for controlling the PDW generating unit 130 at the time of preparing the collection strategy so that the PDW is not generated from the beginning if the pulse width is within the threshold value (several tens ns) There is also a method.

FIG. 3 is an example of a condition table for judging and removing a false PDW (Pulse Description Word) according to an embodiment of the present invention. Referring to FIG. 3, it is a condition table indicating a condition for removing the corresponding PDW in a software manner. That is, a PDW that matches the condition of the condition table is found and detected as a false detection PDW and removed.

The condition table consists of items and conditions. Items consist of pulse arrival time difference, pulse width difference, pulse intensity difference, and so on. Particularly, such a pulse arrival time difference is a difference between a pulse arrival time difference (ns) relative to the LE time relative to the LE (Leading Edge) time point of the pulse signal and a TE time Pulse arrival time difference (ns), and the like. In the case of the pulse arrival time difference, the pulse width is within the threshold TH_toa, the pulse width is within the threshold TH_pw, and the pulse intensity is above the threshold TH_pa.

This software method is a method of software removal of PDW after collection, so it is additionally removed from the number of collection required by the original operator. Therefore, there is a disadvantage that the actual number of effective collectors is reduced, so that a sufficient number of collectors is set for signal analysis and / or identification.

FIG. 4 is a flowchart illustrating a process of configuring and controlling a collecting power of a radar signal according to an exemplary embodiment of the present invention. Referring to FIG. Referring to FIG. 4, the operator configures collection strategy information for analyzing and / or identifying a radar signal of interest using the screen displayed on the display unit 150 (step S410). The acquisition strategy information may generally include the frequency range of interest, the bandwidth of the receiver, the reception threshold, the polarity of the antenna, the acquisition time, the number of acquisitions, and the like.

Using the collection strategy information, the analysis identifying unit 140 controls the RF receiving unit 120 and / or the PDW generating unit 120 to collect signals.

FIG. 5 is a flowchart illustrating a process of receiving, analyzing, identifying, and displaying a radar signal according to FIG. 5, when a radar signal is input through the antenna unit 110, an RF signal is converted into an intermediate frequency (IF) signal through the RF receiving unit 120 and is input to the PDW generating unit 130 S510, S520).

The PDW generator 130 configured by a wideband multichannel digital receiver measures a signal when a signal equal to or higher than the reception threshold value included in the acquisition strategy information exists to generate a PDW (step S530). The generated PDW is stored in the internal memory of the PDW generating unit 130 and an interrupt is sent to the analysis identifying unit 140. In this case, the PDW generally includes information such as pulse frequency, pulse width, pulse intensity, pulse arrival time, pulse arrival azimuth, polarity, and the like.

When the process of reading the PDWs from the analysis identifying unit 140 is completed when the PDW generating unit 130 sends an interrupt that the collection is completed, the analysis identifying unit 140 reads the condition table of the strong signal PDW PDWs are detected as false PDWs and removed (step S540).

The analysis identification unit 140 analyzes and identifies the signal after removing the false detection PDWs, transmits the result to the display unit 150, and the display unit 150 displays the transmission result on the screen (step S550, S560).

Then, the operator can set control variables such as pulse strength, frequency, and pulse width in order to generate or delete the PDW matching the specific condition in the PDW generating unit 130. [ An operator can set a specific condition by ANDing and / or ORing control variables and creating or deleting a PDW corresponding to this condition

In addition to the method of removing false positives PDW by software, there may be a method of removing the PDW having the possibility of false positives by using the method described above. For this purpose, the operator additionally sets information (pulse width control information, etc.) for controlling the PDW generating unit 130 when configuring the collection strategy information, and if the pulse width is within TH_pw in the PDW generating unit 130, Can not be generated.

However, this hardware method does not generate all the PDWs within TH_pw without comparing with the strong signal that is received. Therefore, the PDWs of the normal short pulse including the false PDWs generated by the interference between the channels due to the strong signal There is a possibility to delete it.

100: Pulse description word (PDW) removal device
110:
120: RF receiver
130: PDW generating unit
140:
150:

Claims

A method for removing false positive short pulse PDW (Pulse Description Word) due to interchannel interference in a wideband multi-channel receiver,
(a) receiving radar signals;
(b) converting the radar signals into intermediate frequency signals;
(c) generating pulse description words (PDW) through the intermediate frequency signals using acquisition strategy information including a preset reception threshold;
(d) analyzing and identifying the corresponding PDWs among the PDWs according to a preset condition table as the detected PDWs, removing the PDWs from which the false PDWs are removed; And
(e) displaying the results of the analysis and identification,
The condition table is false shot pulse PDW removed characterized in that the support comprises a pulse arrival time difference, a pulse width difference, the pulse intensity difference.

The method according to claim 1,
Wherein the PDW includes a pulse frequency, a pulse width, a pulse intensity, a pulse arrival time, a pulse arrival azimuth, and a polarity.

The method according to claim 1,
Wherein the acquisition strategy information includes a frequency range of interest, a bandwidth of the broadband multi-channel receiver, a reception threshold, an antenna polarity, a collection time and a collection number for analyzing and identifying a radar signal of interest. Method of removing short pulse PDW.

delete

The method according to claim 1,
The pulse arrival time difference is a pulse arrival time difference relative to an LE time point near a LE (Leading Edge) time point of a pulse signal and a pulse arrival time difference relative to a TE time relative to a TE (Trailing Edge) Wherein the short pulse PDW removal method comprises the steps of:

The method according to claim 1,
Wherein the time unit of the pulse arrival time difference is nanoseconds (ns), the time unit of the pulse width difference is microseconds (μs), and the unit of the pulse intensity difference is dBm. .

The method according to claim 1,
Wherein the acquisition strategy information includes control information for controlling the PDW generator so as not to generate the PDWs if the pulse width is within a predetermined threshold value for controlling the false PDWs in a hardware manner. PDW removal method.

The method according to claim 1,
According to the control of the display unit or the analysis identifying unit, the PDW generating unit may set a control variable including pulse strength, frequency, and pulse width to generate or delete a PDW matching a predetermined condition, Wherein the PDW generating unit generates or deletes the PDW according to the specific condition by performing an AND logical operation or an OR logic operation on the control variable.

An apparatus for removing a false pulse short description pulse (PDW) by interchannel interference in a wideband multi-channel receiver,
An antenna unit for receiving radar signals;
An RF (Radio Frequency) receiver for converting the radar signals into intermediate frequency signals;
A PDW generation unit for generating pulse description words (PDW) through the intermediate frequency signals using pre-set acquisition strategy information;
An analysis identification unit for determining and disposing corresponding PDWs among the PDWs according to a preset condition table as false detection PDWs and analyzing and identifying the PDWs from which the false detection PDWs have been removed; And
And a display unit for displaying a result of the analysis and identification,
Wherein the condition table comprises pulse arrival time difference, pulse width difference, and pulse intensity difference.

10. The method of claim 9,
Wherein the PDW generator is a wideband multi-channel receiver.