KR101957291B1 - Apparatus and method for detecting direction of arrival signal in Warfare Support System - Google Patents

Abstract

The present invention relates to an apparatus and method for measuring a signal arrival angle of a warfare support system, which measures attitude information of a platform, receives a threat signal through a plurality of antennas, And measures a signal arrival azimuth of the threat signal based on the measured phase difference.

Description

Technical Field [0001] The present invention relates to an apparatus and method for measuring a signal arrival angle of a warfare support system,

The present invention relates to a method of compensating a direction of arrival signal error in accordance with a pitch motion of a platform in a platform equipped with an interferometry type Direction Finder will be.

Generally, the ES (Electronic Warfare Support) system measures azimuth angle of a signal using rotation of a directional antenna or phase difference or signal intensity difference between signals received by two or more antennas. Among them, the interferometry direction detection method which detects the azimuth angle of the signal source by using the phase difference of the signals inputted to each antenna using two or more antennas is widely used because of its relatively excellent accuracy. However, this method causes an error in measurement of azimuth angle of a signal due to the pitch motion of a platform equipped with an electronic warfare system.

The present invention relates to a method for compensating an error of a signal arrival azimuth angle due to a pitch motion of a platform in an electronic warfare support system including an interferometry type signal arrival azimuth measurement device, The purpose of the device is to provide.

The azimuth angle measuring apparatus of the electronic warfare assistance system according to the embodiment of the present invention includes an interferometry type signal arrival azimuth angle detector (Direction Finder) to measure the direction of arrival signal, 1. An azimuth angle measuring device for a signal arrival angle of a system,

A measurement unit for measuring attitude information of the platform;

An antenna unit including a plurality of antennas for receiving a threat signal;

An RF front end unit for selectively receiving a specific signal according to a control signal from the threat signal input to the antenna unit;

A controller receiving the attitude information of the platform and generating the control signal for selectively receiving a specific signal from the threat signal and transmitting the control signal to the RF front end;

And a signal direction detection unit for measuring a phase difference of the threat signal and measuring a signal arrival azimuth angle of the threat signal based on the measured phase difference.

According to an embodiment of the present invention,

Calculating a compensation value for compensating the measurement error of the signal arrival azimuth using the pitch information from the attitude information and adding the compensation value to the measured signal arrival azimuth angle to obtain the signal arrival azimuth with the error compensated .

According to an embodiment of the present invention,

)을

식을 통해 계산하며,The measured signal bearing azimuth (

)of

And then,

는 상기 다수의 안테나가 두 안테나라고 가정할 때, 상기 두 안테나 간의 거리를 나타내며,

는 상기 두 안테나에 신호가 도달하는 차이를 거리로 나타낼 수 있다.here,

Represents a distance between the two antennas, assuming that the plurality of antennas is two antennas,

Can indicate the difference in arrival of the signal to the two antennas as a distance.

The method for measuring the signal arrival azimuth angle of the electronic warfare assistance system according to the embodiment of the present invention is a method for measuring the azimuth angle of a signal received by an interferometry type signal arrival azimuth angle detector (Direction Finder) A method for measuring a signal arrival azimuth angle of a system,

Measuring attitude information of the platform;

Receiving a threat signal through a plurality of antennas;

Measuring a phase difference of the threat signal;

And measuring a signal arrival azimuth of the threat signal based on the measured phase difference.

The azimuth angle measuring apparatus and method of a warfare support system according to an embodiment of the present invention estimates azimuth angle of a signal source by statistically processing PDWs including azimuth angle of a signal source, There is an effect of improving the accuracy of signal arrival azimuth measurement by compensating an azimuth measurement error according to a pitch in an electronic warfare support system for estimating the position of a signal source using a plurality of signal arrival azimuth angle results corresponding to a signal source.

1 is a conceptual diagram illustrating a method for receiving a threat signal and measuring a signal arrival azimuth angle in an electronic warfare assistance system for explaining an embodiment of the present invention.
2 is a conceptual view of a platform mounted with a general electronic warfare receiver according to the present invention, viewed from the side and from above.
3 is a conceptual diagram of an elevation angle in a platform equipped with a general electronic warfare receiver according to the present invention.
FIG. 4 is a conceptual diagram of a method of measuring the azimuth angle of a signal source according to the present invention, assuming that the antennas of the signal direction detection unit are two and there is no elevation angle between the signal source and the platform.
FIG. 5 is a conceptual diagram of a method of measuring a signal arrival azimuth of a signal source in the case where there are two antennas of the signal direction detecting unit according to the present invention and there is an elevation angle.
FIG. 6 is a conceptual diagram for receiving a signal in the signal direction detecting unit according to the present invention, measuring a signal arrival azimuth, calculating a compensation value using pitch information, and outputting an error-compensated signal arrival azimuth.
FIG. 7 is a conceptual diagram for constructing a signal arrival azimuth error table according to pitch in the signal direction detection unit according to the present invention and calculating an error compensation value using the measured signal arrival direction angle information when the pitch information is received.
FIG. 8 is a conceptual diagram illustrating an error when the angle of the signal arrival azimuth changes from 30 to 150 degrees in the case of an elevation angle of 0 degrees and a pitch of 0 degrees, assuming two antennas according to the present invention.
FIG. 9 is a conceptual diagram illustrating an error when the signal arrival azimuth changes from 30 to 150 degrees in the case of an elevation angle of -5 degrees and a pitch of 0 degrees, assuming two antennas according to the present invention.
FIG. 10 is a conceptual diagram illustrating an error when the signal arrival azimuth changes from 30 to 150 degrees when the antenna according to the present invention is assumed to have two antennas at an elevation angle of 0 degrees and a pitch of 5 degrees.
11 is a conceptual diagram illustrating an error when the signal arrival azimuth changes from 30 to 150 degrees when the antennas according to the present invention are assumed to have two antennas at an elevation angle of -5 degrees and a pitch of 5 degrees.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or similar components are denoted by the same reference numerals, and redundant explanations thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The electronic warfare support system is a system for detecting / identifying threat signals such as radar signals in a high-density electromagnetic signal environment.

The electronic warfare support system generates a pulse description word (PDW) by measuring the active signal in the broadband band of interest in real time using the pulse unit parameter specification (including the signal arrival azimuth measurement value) to detect / identify the threat signal. And separates the PDWs, which are judged to be the same signal source, from the PDWs collected through the pulse train separation technique.

The electronic warfare support system statistically processes the PDWs separated into the same signal source and estimates the azimuth angle of the signal source. And, the electronic warfare support system estimates the position of the signal source by using the azimuth angle results of the same signal source received from different systems.

Therefore, it is necessary to minimize the measurement error since the measured azimuthal azimuth measured when generating each PDW affects the azimuth or position estimate of the source after statistical processing. Especially, in the case of a platform equipped with an interferometric type signal arrival azimuth measuring device, the movement of the platform affects the capability of measuring the azimuth angle of the incoming signal.

Therefore, the present invention describes a signal arrival azimuth measurement error according to a pitch motion of a platform, and describes a method and apparatus for compensating the error.

FIG. 1 is a block diagram illustrating an apparatus for measuring azimuth angle of a signal received by an electronic warfare assistance system according to an embodiment of the present invention. The system receives a threat signal and measures a signal arrival azimuth.

As shown in FIG. 1, the signal arrival azimuth measurement device of the electronic warfare support system according to the embodiment of the present invention includes:

A measurement unit 100 for measuring attitude information of the platform;

An antenna unit 500 composed of a plurality of antennas for receiving a threat signal;

An RF front end unit 400 for selectively receiving a specific signal according to a control signal from a threat signal input to the antenna unit 500;

The platform attitude information is received from the attitude information measuring unit 100 of the platform,

A control unit 200 for generating the control signal for selectively receiving a specific signal from the threat signal and transmitting the control signal to the RF front end unit 400;

And a signal direction detection unit 300 for measuring the phase difference of the threat signal received through the plurality of antennas from the RF front end unit 400 and measuring the signal arrival azimuth angle of the threat signal based on the measured phase difference.

The signal direction detecting unit 300 receives the threat signal from the plurality of antennas 500 transmitted from the RF front end unit 400, measures the phase difference of the received threat signal, and based on the measured phase difference Calculates a compensation value for compensating the measurement error of the signal arrival azimuth using the pitch information from the attitude information transmitted from the control unit 200 and outputs the compensation value to the obtained signal arrival azimuth To obtain the signal-bearing azimuth with the error compensated.

The platform attitude information measuring unit 100 periodically measures the attitude information (Roll, Pitch, Yaw) of the platform using an inertial navigation system (INS) or the like and transmits the measured attitude information to the controller 200 ) Periodically.

The control unit 200 periodically receives the attitude information from the measuring unit 100 and transmits the attitude information to the signal direction detecting unit 300. [ In addition, the controller 200 controls the RF front end unit 400 using frequency band information of a signal to be received, which is set by the operator.

The signal direction detection unit 300 receives the threat signal from the plurality of antennas 500 transmitted from the RF front end unit 400 and receives the attitude information periodically transmitted from the control unit 200. Then, the phase difference of the received threat signal is measured, and the signal arrival azimuth is obtained based on the measured phase difference and attitude information.

The signal direction detecting unit 300 calculates a compensation value for compensating a measurement error of the signal arrival azimuth using pitch information from the attitude information transmitted from the controller 200, By adding the compensation value, the error-compensated signal arrival azimuth is obtained.

The RF front end unit 400 selectively transmits only the frequency band information of a signal to be received to the signal direction detecting unit 300 under the control of the controller 200 among the threat signals transmitted from the antenna unit 500.

The antenna unit 500 may include a plurality of antennas for receiving a threat signal and transmits the received signal to the RF front end unit 400.

In the present invention, two antennas may be configured as an antenna unit 500. In the present invention, it is assumed that the antenna unit 500 includes two antennas.

FIG. 2 is a conceptual view of a platform 600 mounted with an electronic warfare receiver according to the present invention, viewed from a side and an upper side. Reference numeral 700 denotes a plurality of antenna units.

The platform means a moving object including the signal arrival azimuth measurement device of the electronic warfare support system of FIG. 1, and the moving object may be a guided vehicle, an aircraft, or the like.

3 is a conceptual diagram of an elevation angle (an angle between the horizontal plane of the platform 600 and the signal source 800) in the platform 600 equipped with the electronic warfare receiver according to the present invention.

Referring to FIG. 4 to FIG. 13, a method of calculating a compensation value by the signal direction detection unit 300 and adding a compensation value to the measured signal reception azimuth angle to obtain a signal reception azimuth angle with compensated error by the pitch movement is described in detail Explain.

4 is a conceptual diagram of a method of measuring the azimuth angle of a signal source according to the present invention assuming that there are two antennas and when there is no elevation angle between a signal source and a platform.

3차원 직각좌표계를 가정하며, 운동의 중심은 원점(0,0,0)으로 가정한다. In each drawing, the platform's coordinate system is

We assume a three-dimensional Cartesian coordinate system, and assume that the center of motion is the origin (0,0,0).

)은 다음 수학식1과 같이 측정된다. Referring to FIG. 4, when there is no elevation angle, the signal arrival azimuth angle

) Is measured as shown in the following equation (1).

는 두 안테나 간의 거리를 나타내며,

는 y축의 단위벡터(0,1,0)과 플랫폼의 헤딩방향과의 시계방향 각도 차이를 의미하며,here,

Represents the distance between two antennas,

Represents the difference in the clockwise angle between the y-axis unit vector (0, 1, 0) and the platform heading direction,

는 신호가

축과 평행하게

축 방향으로 진행한다고 가정할 때 두 안테나에 신호가 도달하는 차이를 거리로 나타낸 것이다.

The signal

Parallel to the axis

Assuming that it travels in the axial direction, the distance that the signal arrives at both antennas is the distance.

)이다. The axis of the antenna base line connecting the two antennas is the same as the platform heading direction and the measurement of the angle of incidence of the signal source in the clockwise direction with respect to the antenna base line is the signal arrival azimuth angle

)to be.

5 is a conceptual diagram of a method of measuring the azimuth angle of the signal source of the signal source when there are two antennas according to the present invention.

)이 있는 경우(

) 신호도래방위각은 다음 수학식2-3과 같이 측정된다.Referring to Figure 5,

) Is present (

) The signal arrival azimuth angle is measured as shown in Equation 2-3 below.

)이다. Here, the axis of the base line connecting the two antennas is the same as the platform heading direction, and the measurement of the angle of incidence of the signal source in the clockwise direction with respect to the antenna base line is referred to as a signal arrival azimuth angle

)to be.

는 두 안테나 간의 거리이며,

는 신호가

축과 평행하게

축 방향으로 진행한다고 가정할 때 두 안테나에 신호가 도달하는 차이를 거리로 표현한 것이다.And

Is the distance between two antennas,

The signal

Parallel to the axis

Assuming that it travels in the axial direction, the difference in the signal reaching the two antennas is expressed as distance.

만큼 회전한 후, 다시 y축을 기준으로 고각(

)만큼 회전한 단위벡터이다. R은 임의의 u벡터가 있을 때

만큼 회전변환 시키는 변환 매트릭스이다. 플랫폼을 원점을 중심으로 주어진 벡터

를 축으로 피치각(

)만큼 반시계 방향으로 회전하는 피치(Pitch) 운동에 따른

위치에 있는 안테나의 새로운 위치

는 수학식 4와 같이 계산된다. In FIG. 5, a represents a unit vector in the y-axis (0, 1, 0) in the clockwise direction with respect to the z-axis

, And then the elevation angle (y-axis)

). ≪ / RTI > R is an arbitrary u vector

As shown in FIG. The vector given the platform around the origin

The pitch angle (

) According to the pitch movement rotating in the counterclockwise direction

The new location of the antenna in position

Is calculated as shown in Equation (4).

위치에 있는 두 안테나의 좌표값을 이용하여 신호도래방위각(

)을 계산하는 수학식 5-6은 다음과 같다.After the pitch movement of these platforms,

Using the coordinate values of the two antennas in position,

) ≪ / RTI >

는

의 x축 좌표값으로 신호가 y축과 평행하게 -x축 방향으로 진행한다고 가정할 때 두 안테나에 신호가 도달하는 차이를 거리로 표현한 것과 동일한 값이다.here,

The

The x-axis coordinate value of the signal is equal to the distance expressed by the difference that the signal reaches the two antennas assuming that the signal travels in the -x-axis direction parallel to the y-axis.

FIG. 6 is a conceptual diagram for receiving a signal in the signal direction detection unit S300 according to the present invention, measuring azimuth angle of the signal arrival angle, calculating a compensation value using the pitch information, and outputting the azimuth compensated azimuth angle.

Referring to FIG. 6, a method for calculating an error-compensated signal arrival azimuth in the signal direction detecting unit 300 will be described in detail.

In step S100, a signal received from the two antennas from the RF front end 400 is received.

)을 측정한다.In step S200, the phase difference of the signals received from the two antennas is used to calculate the signal arrival azimuth angle

).

는 수신된 신호의 파장을 의미하며,

는 두 안테나에 수신된 신호의 위상차를 의미한다.here,

Denotes the wavelength of the received signal,

Denotes the phase difference between the signals received by the two antennas.

In step S300, the error compensation value is calculated using the pitch information, and the calculation method will be described with reference to FIG.

7 is a conceptual diagram for constructing a signal arrival azimuth error table according to pitch in the signal direction detecting unit 300 according to the present invention and calculating an error compensation value using the measured signal arrival azimuth information when pitch information is received.

In step S400, an error-compensated signal arrival azimuth is calculated by adding the compensation value obtained in step S300 to the signal arrival azimuth measured in step S200.

A compensation value calculation method using pitch information will be described with reference to FIG.

In step S301, a signal arrival azimuth error table according to the pitch is constructed, and a signal arrival azimuth error according to the pitch using Equation (6) is the same as the example of FIG. 8 to FIG.

FIG. 8 is a conceptual diagram illustrating an error when the signal arrival azimuth changes from 30 to 150 degrees in the case of an elevation angle of 0 degrees and a pitch of 0 degrees, assuming two antennas in the electronic warfare support system according to the present invention.

FIG. 9 is a conceptual diagram illustrating an error when the signal arrival azimuth changes from 30 to 150 degrees in the case of an elevation angle of -5 degrees and a pitch of 0 degrees, assuming two antennas according to the present invention.

10 is a conceptual diagram illustrating an error when the angle of the signal arrival azimuth changes from 30 to 150 degrees when the elevation angle is 0 degree and the pitch is 5 degrees, assuming that the antenna according to the present invention is two antennas.

11 is a conceptual diagram illustrating an error when the signal arrival azimuth changes from 30 to 150 degrees when the antennas according to the present invention are assumed to have two antennas at an elevation angle of -5 degrees and a pitch of 5 degrees.

Hereinafter, a method of constructing the signal arrival azimuth error table according to the pitch will be described.

The signal arrival azimuth error table can be configured in two ways. First, as shown in Tables 1 and 2 below, an error table according to the pitch can be constructed while changing the pitch value and the orientation in specific units.

Azimuth angle (degrees) 1 degree 2 degrees

Error (degree) x.x degrees x.x degrees

Azimuth angle (degrees) 1 degree 2 degrees

Error (degree) x.x degrees x.x degrees

Second, as shown in Tables 3 and 4 below, the azimuth error according to the pitch is obtained as shown in Tables 1 and 2 while varying the pitch value and the azimuth in a specific unit, and a representative value that can minimize the error with respect to the entire azimuth An error table can be constructed.

Azimuth angle (degrees) 1 degree 2 degrees

Error (degree) x.x degrees

Azimuth angle (degrees) 1 degree 2 degrees

Error (degree) x.x degrees

In step S302, pitch information is received.

In step S303, the error compensation value is calculated using the pitch information, the signal arrival azimuth information, and the signal arrival azimuth error table according to the pitch.

As a method of calculating the error compensation value, the first method finds one error table field closest to the received pitch information and the measured signal arrival azimuth, and multiplies the value of the field by -1 to calculate a compensation value. In the second method, if there is a matching field, the value of the field is multiplied by -1 to calculate the compensation value. If there is no matching field, the two closest fields are found, and the values of the two fields are subjected to linear interpolation. And multiplies it by -1 to calculate the compensation value.

As described above, according to the present invention, the signal arrival azimuth measurement device and the method of the Warfare Support System of the electronic warfare support system can statistically process the PDWs including the signal arrival azimuth angle of the signal source, In a typical electronic warfare support system that estimates the incoming azimuth and estimates the position of a signal source using multiple signal arrival azimuths corresponding to the same signal source, the signal arrival azimuth measurement error is compensated for by the pitch. There is an effect to improve.

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 (6)

1. An azimuth angle measuring device for an electronic warfare assist system for measuring a direction of arrival signal through an interferometry type direction finding finder,
A measurement unit for measuring attitude information of the platform;
An antenna unit including a plurality of antennas for receiving a threat signal;
An RF front end unit for selectively receiving a specific signal according to a control signal from the threat signal input to the antenna unit;
A controller receiving the attitude information of the platform and generating the control signal for selectively receiving a specific signal from the threat signal and transmitting the control signal to the RF front end;
Calculating a compensation value for compensating a measurement error of the initial signal arrival azimuth using pitch information from the attitude information, and adding the compensation value to the measured signal arrival azimuth, And a signal direction detecting unit for measuring the signal,
The signal-
Calculates the initial signal arrival azimuth angle by reflecting an elevation angle of the platform among the attitude information,
A compensation value calculated for an error corresponding to the pitch information is added to the initial signal arrival direction azimuth from an error table composed of a representative value capable of minimizing an error with respect to the whole azimuth to measure the azimuth compensated signal arrival azimuth An azimuth angle measuring device for signal arrival of an electronic warfare support system. delete delete A method for measuring the azimuth angle of a signal of an electronic warfare assist system for measuring a signal arrival direction signal through an interferometry direction finding finder,
Measuring attitude information of the platform;
Receiving a threat signal through a plurality of antennas;
Measuring a phase difference of the threat signal;
And measuring a signal arrival azimuth of the threat signal based on the measured phase difference,
Wherein the step of measuring the signal arrival azimuth of the threat signal comprises:
Calculating an initial signal arrival azimuth angle of the platform information reflecting the elevation angle of the platform;
Detecting an error corresponding to pitch information in the attitude information from an error table composed of representative values capable of minimizing an error with respect to the entire azimuth based on the measured phase difference;
Calculating a compensation value based on the detected error;
And calculating the signal arrival azimuth angle of the threat signal by adding the calculated compensation value to the initial signal arrival azimuth angle. delete delete

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