KR20200114442A - Method and apparatus for generating simulated signals in a multistatic passive coherent location(PCL) system - Google Patents

Abstract

An apparatus for generating a simulation signal in a multistatic passive coherent location (PCL) system comprises: a scenario simulation unit for receiving information on a transmitter, a receiver, and a target to generate a scenario; a reference signal simulation unit for simulating a reference signal received in a line-of-sight (LOS) path between the transmitter and the receiver; a target reflection signal simulation unit for simulating a target reflection signal received as a signal emitted from the transmitter is reflected by a target; and a clutter signal simulation unit for setting a plurality of virtual transmitters around the receiver, determining clutter candidates based on the altitude of the transmitter and the receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver, selecting clutter candidates with a line of sight (LOS) secured based on a Fresnel zone in the transmitter direction among the clutter candidates as final clutters, and simulating a clutter reflection signal based on the locations of the final clutters.

Description

A method and apparatus for generating simulated signals in a multistatic passive coherent location (PCL) system TECHNICAL FIELD [Method and apparatus for generating simulated signals in a multistatic passive coherent location (PCL) system}

The present disclosure relates to a method and apparatus for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system.

The multistatic PCL (Passive Coherent Location) system is a system that detects and estimates the position of a target through signal processing between a direct signal emitted from a plurality of third transmitters and a target reflected signal reflected and received from the target. .

Since the multi-static PCL system is operated using a number of peripheral signals, the signal reception status varies depending on the placement of the transmitter and receiver, the location of the target, and the location of the clutter, which is large in the target detection performance of the multi-static PCL system. Will have an effect.

Therefore, in order to develop a multi-static PCL system, various conditions must be considered, and accordingly, a large cost for development and a long period may be required. Therefore, before an actual field test is performed, a simulation device capable of performing a pre-test to verify the performance of a multistatic PCL system for various scenarios is required.

It is to provide a method and apparatus for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system.

The technical problem to be achieved by this embodiment is not limited to the technical problems as described above, and other technical problems may be inferred from the following embodiments.

According to an aspect of the present disclosure, an apparatus for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system includes: a scenario simulation unit for generating a scenario by receiving information on a transmitter, a receiver, and a target; A reference signal simulation unit that simulates a reference signal received through a line of sight (LOS) path between the transmitter and the receiver; A target reflection signal simulation unit that simulates a target reflection signal received by reflecting the signal radiated from the transmitter to a target; And setting a plurality of virtual transmitters around the receiver, and determining clutter candidates based on altitudes of the transmitter and the receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver. And, among the clutter candidates, clutter candidates having a line of sight (LOS) secured based on a Fresnel zone in the transmitter direction are selected as final clutters, and based on the positions of the final clutters Thus, a clutter signal simulation unit for simulating a clutter reflection signal may be included.

In addition, the plurality of virtual transmitters may be located apart from the receiver by a distance between the transmitter and the receiver and may be disposed at a predetermined angular interval around the receiver.

In addition, the clutter signal simulation unit, for each of the final clutters, sets a final clutter signal strength based on a final clutter reflection area and an RCS value per unit area of the final clutter, and is reflected to the final clutter. A time delay value may be set based on a signal path and a difference between a direct path between the transmitter and the receiver, and a clutter reflection signal may be simulated based on the final clutter signal strength and the time delay value.

In addition, the target reflection signal unit performs coordinate transformation with respect to the movement path of the target stored in the scenario simulation unit so that the position of the receiver is at the origin, and the target reflection based on the result of the coordinate transformation and the movement speed of the target Signals can be simulated.

In addition, an apparatus for generating a simulated signal in a multi-static PCL system includes a digital simulation signal generator that generates digital I/Q (Inphase and Quadrature) data for each of the simulated reference signal, target reflection signal, and clutter signal; And an IF signal simulation unit for receiving I/Q signal data from the digital simulation signal generation unit and converting it into an intermediate frequency (IF) analog signal. And an RF signal synthesizer for generating a radio frequency (RF) signal based on the IF analog signal received from the IF signal simulation unit.

In addition. The IF signal simulation unit may include a frequency division multiplexer for converting a frequency of the digital I/Q data into a frequency of an IF band;

DUC (Digital Up Converter) for increasing a sampling rate of the converted digital I/Q data; And at least one digital analog converter (DAC) converting the digital I/Q data having the increased sampling rate into an analog signal.

In addition, the at least one DAC includes a wp 1 DAC for converting digital I/Q data having a signal strength greater than or equal to a preset value among the digital I/Q data into an analog signal, and a preset value among the digital I/Q data. It may include a second DAC for converting digital I/Q data having a signal strength of less than the analog signal.

According to another aspect, there is provided a method for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system, the method comprising: generating a scenario by receiving information on a transmitter, a receiver, and a target; Simulating a reference signal received through a line of sight (LOS) path between the transmitter and the receiver; Simulating a target reflected signal received by reflecting a signal radiated from the transmitter to a target; And setting a plurality of virtual transmitters around the receiver, and determining clutter candidates based on altitudes of the transmitter and the receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver. Step to do; Determining, among the clutter candidates, clutter candidates having a line of sight (LOS) secured as final clutters based on a Fresnel zone in the transmitter direction; And simulating a clutter reflection signal based on the positions of the final clutters.

According to another aspect, in a computer-readable recording medium in which a program for implementing a method for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system is recorded, the method comprises: a transmitter, a receiver And generating a scenario by receiving information on a target. Simulating a reference signal received through a line of sight (LOS) path between the transmitter and the receiver; Simulating a target reflected signal received by reflecting a signal radiated from the transmitter to a target; And setting a plurality of virtual transmitters around the receiver, and determining clutter candidates based on altitudes of the transmitter and the receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver. Step to do; Determining, among the clutter candidates, clutter candidates having a line of sight (LOS) secured as final clutters based on a Fresnel zone in the transmitter direction; And simulating a clutter reflection signal based on the positions of the final clutters.

According to another aspect, in a computer program stored in a medium to execute a method for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system combined with hardware, the method comprises: a transmitter, a receiver, and a target. Generating a scenario by receiving information about the input; Simulating a reference signal received through a line of sight (LOS) path between the transmitter and the receiver; Simulating a target reflected signal received by reflecting a signal radiated from the transmitter to a target; And setting a plurality of virtual transmitters around the receiver, and determining clutter candidates based on altitudes of the transmitter and the receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver. Step to do; Determining, among the clutter candidates, clutter candidates having a line of sight (LOS) secured as final clutters based on a Fresnel zone in the transmitter direction; And simulating a clutter reflection signal based on the positions of the final clutters.

1 is a diagram for describing an example of a multistatic PCL (Passive Coherent Location) system.
FIG. 2 is a diagram for describing an example of an apparatus for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system.
3 is a diagram illustrating an example of a process in which a scenario simulation unit is performed.
4 is a diagram for describing an example of a process in which a reference signal simulation unit is performed.
5A is a diagram illustrating an example of a process in which a clutter signal simulation unit is performed.
5B, 5C, and 5D are diagrams for explaining an example of a process in which a clutter signal simulation unit selects final clutters.
6A is a diagram illustrating an example of a process in which a target reflection signal unit is performed.
6B is a diagram for describing an example of a result of coordinate transformation of a moving path of a target.
7 is a diagram illustrating an example of a configuration of a digital simulation signal generator.
FIG. 8 is a diagram illustrating an example of a configuration of an intermediate frequency (IF) signal simulation unit and a radio frequency (RF) signal synthesis unit.
9 is a flowchart illustrating an example of a method of generating a simulated signal in a multistatic PCL (Passive Coherent Location) system.

The terms used in the present embodiments have selected general terms that are currently widely used as possible while considering the functions in the present embodiments, but this varies depending on the intention or precedent of a technician engaged in the art, the emergence of new technologies, etc. I can. In addition, in certain cases, there are terms that are 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 embodiments should be defined based on the meaning of the term and the contents of the present embodiments, not a simple name of the term.

In the descriptions of the embodiments, when a part is said to be connected to another part, this includes not only the case that it is directly connected, but also the case that it is electrically connected with another component interposed therebetween. . In addition, when a certain part includes a certain component, it means that other components may be further included, rather than excluding other components unless specifically stated to the contrary.

Terms such as "consist of" or "comprises" used in the present embodiments should not be interpreted as necessarily including all of the various components, or steps described in the specification, and some of the components or It should be construed that some steps may not be included, or may further include additional elements or steps.

The description of the following embodiments should not be construed as limiting the scope of the rights, and what those skilled in the art can easily infer should be construed as belonging to the scope of the embodiments. Hereinafter, embodiments for illustration only will be described in detail with reference to the accompanying drawings.

1 is a diagram for describing an example of a multistatic PCL (Passive Coherent Location) system.

Referring to FIG. 1, the multi-static PCL system 100 uses signals radiated from a plurality of transmitters 110 #1 to #M, and radiation signals of a plurality of transmitters 110 #1 to #M are targeted ( It is a system that estimates the position of the target 120 using a signal reflected by 120 and received by the receiver 130.

The multi-static PCL system 100 may utilize a plurality of transmitters 110 #1 to #M that exist in different positions and have different carrier frequencies in order to estimate the position of the target in all directions. As a plurality of transmitters 110 having different frequencies #1 to #M are used, it is possible to solve the problem of overlapping frequencies. Each of the plurality of transmitters 110 #1 to #M may correspond to a transmitting station for wireless broadcasting services such as frequency modulation (FM) radio broadcasting and digital audio broadcasting (DAB).

Multi-static PCL system 100, for each of the plurality of transmitters 110 #1 to #M, the signal radiated from the transmitter is received through a line of sight (LOS) path between the transmitter and the multi-static PCL system 100 Direct signal can be received in high quality. In addition, the multi-static PCL system 100 is radiated from the transmitter while minimizing interference sources including direct signals and multipath clutter signals for each of the plurality of transmitters 110 #1 to #M. The reflected signal may be reflected on the target and received target reflection signal may be received.

The multi-static PCL system 100 obtains a high-quality direct signal and a target reflected signal with minimized interference sources, and maximizes the gain of the target component through coherent processing between the acquired direct signal and the target reflected signal. I can.

As described above, since the multi-static PCL system 100 detects a target using a plurality of peripheral signals, the signal reception state varies depending on the arrangement of the transmitter and the receiver, the location of the target, and the location of the clutter. It has a great influence on the target detection performance of the multi-static PCL system 100. Therefore, in order to develop a high-performance multi-static PCL system 100, various conditions must be considered, and before an actual outdoor test is performed, the multi-static PCL system 100 for various scenarios in an actual outdoor environment through a simulation test device. It is necessary to verify the performance of

FIG. 2 is a diagram for describing an example of an apparatus for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system.

Referring to FIG. 2, the multi-static PCL system 100 may include a scenario generation module 200 and a simulated signal generation module 210.

The scenario generation module 200 may generate a simulation signal in a digital form by control through a user's Graphic User Interface (GUI). For example, the scenario generation module 200 includes a scenario simulation unit 201, a reference signal simulation unit 202, a clutter signal simulation unit 203, a target reflection signal simulation unit 204, and a digital simulation signal generation unit ( 205).

The scenario simulation unit 201 may generate a scenario by receiving information on a transmitter, a receiver, and a target. For example, the scenario simulation unit 201 may create, store, load, and modify a scenario input by a user through a GUI.

The reference signal simulation unit 202 may simulate a reference signal received through a line of sight (LOS) path between a transmitter and a receiver. In addition, the clutter signal simulation unit 203 may simulate a clutter signal reflected and received from an object other than a target. The target reflection signal simulation unit 204 may simulate a target reflection signal received by reflecting a signal emitted from the transmitter to a target.

The digital simulation signal generation unit 205 is a reference signal simulation unit 202, a clutter signal simulation unit 203, and the target reflection signal simulation unit 204, respectively, to each of the simulated reference signal, the target reflection signal and the clutter signal. Digital I/Q (Inphase and Quadrature) data can be generated.

The digital I/Q data generated by the digital simulation signal generation unit 205 may be transmitted to the simulation signal generation module 210 through a local area network or the like.

The simulated signal generation module 210 may finally convert the received digital simulated signal into a radio frequency (RF) signal. For example, the simulation signal generation module 210 may include an IF (Intermediate Frequency) signal simulation unit 211 and an RF signal synthesis unit 212.

The IF signal simulation unit 211 may receive I/Q signal data from the digital simulation signal generation unit 205 and convert it into an IF (intermediate frequency) analog signal.

The RF signal synthesis unit 212 may finally generate a radio frequency (RF) signal based on the IF analog signal received from the IF signal simulation unit.

3 is a diagram illustrating an example of a process performed in a scenario simulation unit.

In step 300, the user may generate or load a scenario in the scenario simulation unit 201 through a GUI through an initialization step.

In step 310, the user may input information about the transmitter to the scenario simulation unit 201. For example, the user may input the location of the transmitter and signal information generated from the transmitter.

In step 320, the user may input information on the receiver to the scenario simulation unit 201. For example, a user may input information including a location of a receiver and an antenna gain of the receiver.

In step 330, the user may input information on the target to the scenario simulation unit 201. For example, the user may input target information including the type and shape of the target, radar cross section (RCS), and attitude information. In addition, the user may input target movement information, and the target movement information may include information about a moving path of the target and a moving speed of the target.

In step 340, the user may input error information into the scenario simulation unit 201. The error information is due to a measurement error of the multi-static PCL system, and may be due to fluctuations in signal strength and frequency during a signal reception process.

In step 340, the scenario input by the user may be stored in the scenario simulation unit 201.

4 is a diagram for describing an example of a process in which a reference signal simulation unit is performed.

In step 400, the reference signal simulation unit 202 may go through an initialization step.

In step 410, the reference signal simulation unit 202 may acquire transmitter information and receiver information stored in the scenario simulation unit 201. The transmitter information includes the location of the transmitter and signal information generated from the transmitter, and the receiver information may include information about the location of the receiver and antenna gain of the receiver.

In step 420, the reference signal simulation unit 202 may simulate a reference signal using the acquired transmitter information and receiver information. As for the reference signal, the user may input information on the receiver to the scenario simulation unit 201. For example, a signal radiated from a transmitter may refer to a direct signal received through a line of sight (LOS) path between a transmitter and a receiver.

In step 420, the reference signal simulation unit 202 may simulate a reference signal using the acquired transmitter information and receiver information.

In step 430, the reference signal simulation unit 202 may display the result of the simulated reference signal through the GUI.

5A is a diagram illustrating an example of a process in which a clutter signal simulation unit is performed.

In step 500, the clutter signal simulation unit 203 may go through an initialization step.

In step 510, the clutter signal simulation unit 203 may acquire transmitter information and receiver information stored in the scenario simulation unit 201. The transmitter information includes the location of the transmitter and signal information generated from the transmitter, and the receiver information may include information about the location of the receiver and antenna gain of the receiver.

In step 520, the clutter signal simulation unit 203 may set a plurality of virtual transmitters and determine clutter candidates. The plurality of virtual transmitters 503 are located apart from the receiver 501 by a distance between the transmitter 502 and the receiver 501 and may be disposed at a predetermined angular interval around the receiver 501. For example, referring to FIG. 5B, the clutter signal simulation unit 203 may set a plurality of virtual transmitters (T _x ') 503 around the receiver (R _x ) 501. The plurality of virtual transmitters 503 may correspond to A, B, C, D, E, F, and H. In FIG. 5B, assuming that the receiver 501 uses an array antenna including eight antenna elements, eight virtual transmitters arranged at intervals of 45 degrees around the receiver 501 are set, but a plurality of virtual transmitters ( The method of setting 503) is not limited thereto, and may be set in various ways.

In addition, the clutter signal simulation unit 203 includes the transmitter 502 and the receiver 501 in sections formed by the transmitter (T _x ) 502 and each of the virtual transmitters 503 and the receiver 501 Clutter candidates 504 may be determined based on the altitude of. Referring to FIG. 5B, the clutter signal simulation unit 203 includes 8 sections A-Rx, B-Rx, C-Rx, D-Rx, E-Rx, F-Rx, G-Rx, and H-Rx. On the other hand, points where LOS is secured based on the altitudes of the transmitter 502 and the receiver 501 may be determined as the clutter candidates 504.

In step 530, the clutter signal simulation unit 203 may select final clutters. The clutter signal simulation unit 203 selects the clutter candidates in which a line of sight (LOS) is secured based on a Fresnel zone in the direction of the transmitter 502 among the clutter candidates 504 as final clutters ( 505) can be selected. For example, referring to FIG. 5C, the clutter signal simulation unit 203 includes eight sections A-Rx, B-Rx, C-Rx, D-Rx, E-Rx, F-Rx, G-Rx, When a Fresnel zone in the direction of the transmitter 502 among the clutter candidates 504 for H-Rx is formed, the clutter candidates 504 included in the Fresnel zone can be selected as the final clutters 505. have.

Meanwhile, referring to FIG. 5D, the clutter signal simulation unit 203 includes eight sections A-Rx, B-Rx, C-Rx, D-Rx, E-Rx, F-Rx, G-Rx, H- For each Rx, when there are a plurality of selected final clutters, one final clutter may be selected based on the LOS Clearance in which signals are clearly received.

In step 540, the clutter signal simulation unit 203 may set the intensity of the clutter reflection signal. The intensity of the clutter reflection signal may be calculated based on the clutter reflection area and the clutter RCS value per unit area input by the user to the scenario simulation unit.

In step 550, the clutter signal simulation unit 203 may calculate a time delay value. For example, the clutter signal simulation unit 203 may set a time delay value based on a difference between a path of a signal reflected from the clutter and a direct path between a transmitter and a receiver. Calculation of the time delay value may be performed by Equation 1 below.

는 클러터 반사 신호의 시간 지연값을,

는 송신기와 클러터 사이의 거리,

는 수신기와 클러터 사이의 거리,

는 송신기와 수신기 사이의 거리를 의미할 수 있다. In Equation 1,

Is the time delay value of the clutter reflection signal,

Is the distance between the transmitter and the clutter,

Is the distance between the receiver and the clutter,

May mean the distance between the transmitter and the receiver.

In step 560, the clutter signal simulation unit 203 may simulate the clutter reflection signal based on the positions of the final clutters. In this case, the clutter signal simulation unit 203 may simulate the clutter reflection signal in consideration of not only the positions of the final clutters, but also the intensity and time delay value of the set clutter reflection signal.

In step 570, the clutter signal simulation unit 203 may display the result of the simulated clutter reflection signal through the GUI.

6A is a diagram illustrating an example of a process in which a target reflection signal unit is performed.

In step 600, the target reflection signal unit 204 may undergo an initialization step.

In step 610, the target reflection signal unit 204 may acquire transmitter information, receiver information, and target information stored in the scenario simulation unit. The transmitter information includes the location of the transmitter and signal information generated from the transmitter, and the receiver information may include information about the location of the receiver and antenna gain of the receiver. In addition, the target information may include the type and shape of the target, a radar reflection area (Radar Cross Section, RCS), and attitude information.

In step 620, the target reflection signal unit 204 acquires the target movement information stored in the scenario simulation unit 201, and generates a target flight trajectory. I can. The target movement information may include information about a moving path of the target and a moving speed of the target.

The target reflection signal unit 204 may perform coordinate transformation on the moving path of the target so that the position of the receiver is at the origin in the Cartesian coordinate system (x, y, z) in order to generate the target flight trajectory. For example, FIG. 6B is an example of a result of coordinate transformation of a moving path of a target input to a scenario simulation unit such that the target reflection signal unit 204 is at the origin of the receiver.

In step 630, the target reflection signal unit 204 may perform the target movement step based on the generated target flight trajectory and the target movement speed. For example, a plurality of target position coordinates according to the moving speed of the target may be displayed on the target flight trajectory of FIG. 6B.

In step 640, the target reflection signal unit 204 may set the intensity and time delay value of the target reflection signal.

When setting the intensity of the target reflection signal, the target reflection signal unit 204 may calculate a target incident angle and a reflection angle of the transmitted signal in an azimuth and elevation direction in order to use a previously secured RCS value. Using the calculated azimuth and elevation components of the transmission signal, the target reflection signal unit 204 may compare and obtain the corresponding RCS value with the frequency of the transmission signal. The target reflection signal unit 204 may calculate the reception strength of the target reflection signal using the RCS value of the target obtained by matching.

Also, the target reflection signal unit 204 may set a time delay value based on a difference between a path of a signal reflected to a target and a direct path between the transmitter and the receiver. The calculation of the time delay value may be performed by Equation 1, as described above in step 560.

In step 650, the target reflection signal unit 204 may simulate the target reflection signal. The target reflection signal unit 204 may simulate the target reflection signal in consideration of the target reflection signal strength and time delay value as well as the position coordinates of the target. In addition, the target reflection signal unit 204 may also consider a Doppler frequency shift value, and the Doppler frequency shift value may be calculated in consideration of the position and movement speed of the target, and the positions of the transmitter and the receiver.

In step 660, the target reflection signal unit 204 may display the result of the simulated target reflection signal through the GUI.

7 is a diagram illustrating an example of a configuration of a digital simulation signal generator.

The reference signal, the clutter signal, and the target reflected signal generated by each of the reference signal simulation unit 202, the clutter signal simulation unit 203, and the target reflection signal simulation unit 204 are transmitted to the digital simulation signal generation unit 700. Can be. The digital simulation signal generation unit 700 may have the same configuration as the digital simulation signal generation unit 205 of FIG. 2.

Referring to FIG. 7, the digital simulation signal generation unit 700 may include an Inphase and Quadrature (IQ)/Signal Description Word (SDW) generation unit 710 and an error reflecting unit 720.

The IQ/SDW generation unit 701 may generate digital I/Q data for each of the received reference signal, clutter signal, and target reflection signal. In addition, the IQ/SDW generation unit 710 may generate SDW data representing a signal generation start time and a center frequency signal strength.

At this time, the error generation unit 720 reads the error information input from the scenario simulation unit and transmits it to the IQ/SDW generation unit 710 so that the error information is reflected when generating digital I/Q data and SDW data. have. The error information is due to a measurement error of the multi-static PCL system, and may be due to fluctuations in signal strength and frequency during a signal reception process.

FIG. 8 is a diagram illustrating an example of a configuration of an intermediate frequency (IF) signal simulation unit and a radio frequency (RF) signal synthesis unit.

The digital I/Q data and SDW data generated by the digital simulation signal generator may be transmitted to the simulation signal generation module 800 through a local area network or the like. The simulated signal generating module 800 may have the same configuration as the simulated signal generating module 210 of FIG. 2.

The simulation signal generation module 800 may finally convert a digital simulation signal received from the digital simulation signal generator into a radio frequency (RF) signal. Referring to FIG. 8, the simulation signal generation module 800 may include an intermediate frequency (IF) signal simulation unit 810 and an RF signal synthesis unit 820. The IF signal simulation unit 810 and the RF signal synthesis unit 820 may have the same configuration as the IF signal simulation unit 211 and the RF signal synthesis unit 212 of FIG. 2, respectively.

The IF signal simulation unit 810 may include a frequency division multiplexer (FDM) 811, a digital up converter (DUC) 812, and a digital analog converter (DAC) 813.

The FDM 811 may convert the baseband digital IQ data received from the digital simulation signal generator into the IF band frequency. The DUC 812 may increase a sampling rate of digital IQ data frequency-converted from the FDM 811. In addition, the DAC 813 may convert digital I/Q data having an increased sampling rate into an analog signal.

Meanwhile, the IF signal simulation unit 810 may include at least one DAC 813, and in the case of FIG. 8, two DACs 813 are used, but the present invention is not limited thereto. In FIG. 8, each of the two DACs 813 converts digital I/Q data having a signal strength greater than or equal to a preset value into an analog signal and analog digital I/Q data having a signal strength less than a preset value. It may correspond to a DAC for converting to a signal. For example, the reference signal and the clutter signal may have a signal strength greater than or equal to a preset value, and the target reflected signal may have a signal strength less than a preset value, but are not limited thereto.

The RF signal synthesis unit 820 may finally generate an RF signal based on the IF analog signal received from the IF signal simulation unit 810.

9 is a flowchart illustrating an example of a method of generating a simulated signal in a multistatic PCL (Passive Coherent Location) system.

In step 910, the apparatus for generating a simulated signal may generate a scenario by receiving information on a transmitter, a receiver, and a target. For example, the device that generates a simulated signal includes the location of the transmitter and signal information generated from the transmitter, the location of the receiver, the antenna gain information of the receiver, and the type, shape, radar cross section (RCS), and posture of the target. Information including information can be input.

In step 920, the apparatus for generating a simulated signal may simulate a reference signal received through a line of sight (LOS) path between the transmitter and the receiver. An apparatus for generating a simulated signal may simulate a reference signal using transmitter information and receiver information input when generating a scenario.

In step 930, the apparatus for generating a simulated signal may simulate a target reflected signal received by reflecting a signal radiated from the transmitter to the target. The apparatus for generating the simulation signal may perform coordinate transformation with respect to the movement path of the target stored in the scenario simulation unit so that the location of the receiver is at the origin, and simulate the target reflection signal based on the result of the coordinate transformation and the movement speed of the target. .

In step 940, the apparatus for generating a simulated signal sets a plurality of virtual transmitters based on the receiver, and in sections formed by the transmitter and the plurality of virtual transmitters and the receiver, the clutter ( clutter) candidates can be determined. The plurality of virtual transmitters are located apart from the receiver by a distance between the transmitter and the receiver, and may be disposed at a predetermined angular interval around the receiver. For example, an apparatus for generating a simulated signal may determine points at which LOS is secured as clutter candidates based on altitudes of the transmitter and the receiver.

In step 950, the apparatus for generating a simulated signal may determine the clutter candidates for which Line Of Sight (LOS) is secured among the clutter candidates based on a Fresnel zone toward the transmitter as final clutters.

In step 960, the apparatus for generating the simulation signal may simulate the clutter reflection signal based on the positions of the final clutters. The clutter signal simulation unit may simulate the clutter reflection signal in consideration of not only the positions of the final clutters, but also the intensity and time delay value of the set clutter reflection signal.

Meanwhile, the above-described embodiments of the present invention can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium. In addition, the structure of the data used in the above-described embodiment of the present invention can be recorded on a computer-readable recording medium through various means. The computer-readable recording medium includes a storage medium such as a magnetic storage medium (eg, ROM, floppy disk, hard disk, etc.), and an optical reading medium (eg, CD-ROM, DVD, etc.).

So far, the present invention has been looked at around its preferred embodiments. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Claims (10)

In the device for generating a simulated signal in a multistatic PCL (Passive Coherent Location) system,
A scenario simulation unit for generating a scenario by receiving information on a transmitter, a receiver, and a target;
A reference signal simulation unit that simulates a reference signal received through a line of sight (LOS) path between the transmitter and the receiver;
A target reflection signal simulation unit that simulates a target reflection signal received by reflecting the signal radiated from the transmitter to a target; And
Set a plurality of virtual transmitters around the receiver, and determine clutter candidates based on altitudes of the transmitter and the receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver, , Among the clutter candidates, clutter candidates having a line of sight (LOS) secured based on a Fresnel zone in the transmitter direction are selected as final clutters, and based on the positions of the final clutters An apparatus comprising a clutter signal simulation unit that simulates a clutter reflection signal. The method of claim 1,
The plurality of virtual transmitters,
An apparatus that is located apart from the receiver by a distance between the transmitter and the receiver and is arranged at a predetermined angular interval around the receiver. The method of claim 1,
The clutter signal simulation unit,
For each of the final clutters, the final clutter signal strength is set based on the final clutter reflection area and the RCS value per unit area of the final clutter, and the path of the signal reflected to the final clutter and the transmitter and the receiver An apparatus for setting a time delay value based on a difference between a direct path with and and simulating a clutter reflection signal based on the final clutter signal strength and the time delay value. The method of claim 1,
The target reflection signal simulation unit,
An apparatus for performing coordinate transformation with respect to the moving path of the target stored in the scenario simulation unit so that the position of the receiver is at the origin, and simulating the target reflection signal based on the result of the coordinate transformation and the moving speed of the target. The method of claim 1,
A digital simulation signal generator for generating digital I/Q (Inphase and Quadrature) data for each of the simulated reference signal, target reflection signal, and clutter signal;
An IF signal simulation unit for receiving digital I/Q signal data from the digital simulation signal generation unit and converting it into an intermediate frequency (IF) analog signal; And
The apparatus further comprises an RF signal synthesis unit for generating a radio frequency (RF) signal based on the IF analog signal received from the IF signal simulation unit. The method of claim 5,
The IF signal simulation unit,
A frequency division multiplexer for converting a frequency of the digital I/Q data into a frequency of an IF band;
DUC (Digital Up Converter) for increasing a sampling rate of the converted digital I/Q data; And
An apparatus comprising at least one Digital Analog Converter (DAC) for converting the digital I/Q data having the increased sampling rate into an analog signal. The method of claim 6,
The at least one DAC,
A first DAC for converting digital I/Q data having a signal strength greater than or equal to a preset value among the digital I/Q data into an analog signal, and
And a second DAC for converting digital I/Q data having a signal strength less than a preset value among the digital I/Q data into an analog signal. In a method of generating a simulated signal in a multistatic PCL (Passive Coherent Location) system,
Generating a scenario by receiving information on a transmitter, a receiver, and a target;
Simulating a reference signal received through a line of sight (LOS) path between the transmitter and the receiver;
Simulating a target reflected signal received by reflecting a signal radiated from the transmitter to a target;
Setting a plurality of virtual transmitters centered on the receiver, and determining clutter candidates based on altitudes of the transmitter and receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver step;
Determining, among the clutter candidates, clutter candidates having a line of sight (LOS) secured as final clutters based on a Fresnel zone in the transmitter direction; And
And simulating a clutter reflection signal based on the position of the final clutters. In a computer-readable recording medium in which a program for implementing a method of generating a simulated signal in a multistatic PCL (Passive Coherent Location) system is recorded,
The above method,
Generating a scenario by receiving information on a transmitter, a receiver, and a target;
Simulating a reference signal received through a line of sight (LOS) path between the transmitter and the receiver;
Simulating a target reflected signal received by reflecting a signal radiated from the transmitter to a target;
Setting a plurality of virtual transmitters centered on the receiver, and determining clutter candidates based on altitudes of the transmitter and receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver step;
Determining, among the clutter candidates, clutter candidates having a line of sight (LOS) secured as final clutters based on a Fresnel zone in the transmitter direction; And
And simulating a clutter reflection signal based on the position of the final clutters. In a computer program stored in a medium to execute a method of generating a simulated signal in a multistatic PCL (Passive Coherent Location) system combined with hardware,
Generating a scenario by receiving information on a transmitter, a receiver, and a target;
Simulating a reference signal received through a line of sight (LOS) path between the transmitter and the receiver;
Simulating a target reflected signal received by reflecting a signal radiated from the transmitter to a target;
Setting a plurality of virtual transmitters centered on the receiver, and determining clutter candidates based on altitudes of the transmitter and receiver in sections formed by the transmitter and the plurality of virtual transmitters and the receiver step;
Determining, among the clutter candidates, clutter candidates having a line of sight (LOS) secured as final clutters based on a Fresnel zone in the transmitter direction; And
And simulating a clutter reflection signal based on the position of the final clutters.

Images