KR102531068B1 - System and method for simulating synthetic aperture radar - Google Patents

Abstract

The present invention discloses a synthetic aperture radar simulation system and method. The method is a SAR simulation method performed by a synthetic aperture radar (SAR) simulator, a ground target reflection simulator, and a simulation controller, including SAR shooting time, target location, and transmission delay time in the simulation controller Generating SAR task data, simulated time and location information, and acquiring simulated ground target data corresponding to the SAR task data, determining simulated time and simulated location based on the simulated time and location information in the SAR simulator and outputting an SAR signal from a first time point based on the simulated time and the SAR photographing time, based on a reflection delay time determined based on a distance between the target location and the simulated location in the SAR simulator. Determining a third time point based on the first time point, and determining a second time point faster than the third time point by the transmission delay time, generating a signal from the SAR simulator to the ground target reflection simulator at the second time point outputting a trigger signal; receiving, in the ground target reflection simulator, the ground target simulation data and outputting a simulated reflection signal corresponding to the ground target simulation data in response to the signal generation trigger signal; and and receiving the simulated reflection signal from the third time point in a SAR simulator.

Description

System and method for simulating synthetic aperture radar

The present invention relates to a system and method for simulating a synthetic aperture radar (SAR), and more particularly, to a synthetic aperture radar simulation system and method for simulating SAR between a SAR device and a ground target in a ground laboratory. it's about

Recently, as the military use of SAR using satellites and aircraft increases, the need for a countermeasure method (ECM, Electronic Counter Measure) for SAR using SAR jammers is increasing. The SAR jammer radiates a jamming signal to the SAR to prevent the SAR from acquiring a normal reflection signal from a ground target, preventing it from obtaining a normal video signal during image synthesis of the SAR collection signal, or an image of a virtual object that does not actually exist. It is induced to be synthesized to create false information. When the operation of SAR jammers becomes common, SAR requires an electronic counter-counter measure (ECCM) against SAR jammers. The ECM function of the SAR jammer and the ECCM function of the SAR require a process of judging the effectiveness of the function and supplementing the technology through various tests on various methods.

However, since SAR is mounted and operated on satellites and aircraft, a single test requires a lot of schedule and cost, so it is difficult to develop and verify technology through repeated tests in a short time. Therefore, in order to develop and verify the ECM function of the SAR jammer and the ECCM function of the SAR in a short period of time and at low cost, the need for a simulation device capable of simulating and testing the function at the laboratory level is increasing.

The problem to be solved by the present invention is to provide a synthetic aperture radar simulation system that simulates SAR between a SAR device and a ground target in a laboratory.

The problem to be solved by the present invention is to provide a synthetic aperture radar simulation method for simulating SAR between a SAR device and a ground target in a laboratory.

The present invention is a technical means for solving the above conventional technical problems, and in the synthetic aperture radar (SAR) simulation system according to one aspect of the present invention, the SAR shooting time, target location, and transmission delay time are included. A simulation operation controller that generates SAR task data to generate, simulated time and location information, and acquires ground target simulation data corresponding to the SAR task data; receives the SAR task data; A SAR simulator that determines a simulated time and a simulated position based on the simulated time and outputs a SAR signal from a first time point based on the simulated time and the SAR shooting time, and outputs a signal generation trigger signal at a second time point, and the ground and a ground target reflection simulator for receiving target simulation data and outputting a simulated reflection signal corresponding to the ground target simulation data in response to the signal generation trigger signal, wherein the SAR simulator is based on the target location and the simulated location. A third time point is determined based on the reflection delay time determined by , the simulated reflection signal is received from the third time point, and the second time point is faster than the third time point by the transmission delay time. It is characterized by determining the point of view.

According to an example, the simulated operation controller may store in advance SAR baseband digital data actually acquired by the SAR device for the target location at the simulated location as the ground target simulation data.

According to another example, the simulation controller receives 3D terrain data of the target location, synthesizes a target SAR image based on the 3D terrain data, and processes the target SAR image with an inverse SAR image, thereby processing the terrestrial SAR image. It may be characterized by acquiring target simulation data.

According to another example, the ground target reflection simulator receives the ground target simulation data and outputs a simulated reflection digital signal corresponding to the ground target simulation data; A simulated reflection signal generator converting the signal into a band signal and outputting the simulated reflection baseband signal in response to the signal generation trigger signal; and generating the simulated reflection signal corresponding to the simulated reflection baseband signal and outputting the simulated reflection signal to the SAR simulator. It may include a second RF transceiver to.

According to another example, the SAR simulator includes a SAR control unit, and the SAR control unit determines the first time point at which a shooting start time of the SAR shooting time and the simulation time are the same, and determines the simulation location and the target location. determining the reflection delay time based on the distance between the two points, determining the third point of view by adding the reflection delay time to the first point of time, and determining the second point of view by subtracting the transmission delay time from the third point of time that can be characterized.

According to another example, the SAR simulator further includes a first RF transceiver, the first RF transceiver generates a local oscillation signal, and outputs the SAR signal from the first time point using the local oscillation signal, , The simulated reflection signal may be converted into a simulated baseband signal using the local oscillation signal.

According to another example, the first RF transceiver outputs the local oscillation signal to the ground target reflection simulator, and the second RF transceiver uses the local oscillation signal generated by the first RF transceiver to simulate the simulation. The simulated reflection signal may be generated from a reflected baseband signal.

According to another example, the SAR simulator further includes a signal transceiver, wherein the signal transceiver generates a signal processing clock signal, converts the simulated baseband signal into a simulated digital signal using the signal processing clock signal, It may be characterized in that the signal generation trigger signal is output to the ground target reflection simulator at the second time point.

According to another example, the signal transmitting and receiving unit outputs the signal processing clock signal to the ground target reflection simulator, and the simulated reflection signal generating unit uses the signal processing clock signal generated by the signal transmitting and receiving unit to generate the simulated reflection digital signal. It may be characterized by converting the signal into a simulated reflected baseband signal.

According to another example, the SAR simulator generates a simulated digital signal from the simulated reflection signal, and the simulation controller performs SAR image processing on the simulated digital signal to synthesize an SAR image of the target location. can be done with

As a technical means for achieving the above-described technical problems, the synthetic aperture radar simulation method according to one aspect of the present invention is performed by a synthetic aperture radar (SAR) simulator, a ground target reflection simulator, and a simulation operation controller As a SAR simulation method, the simulation operation controller generates SAR task data including SAR shooting time, target location, and transmission delay time, simulation time and location information, and obtains ground target simulation data corresponding to the SAR task data. determining a simulated time and a simulated location based on the simulated time and location information in the SAR simulator, and outputting a SAR signal from a first time point based on the simulated time and the SAR shooting time; The simulator determines a third viewpoint based on the first viewpoint based on a reflection delay time determined based on the distance between the target position and the simulated position, and a second viewpoint faster than the third viewpoint by the transmission delay time. Determining a time point, outputting a signal generation trigger signal from the SAR simulator to the ground target reflection simulator at the second time point, receiving the ground target simulation data from the ground target reflection simulator, and Outputting a simulated reflection signal corresponding to the ground target simulation data in response to a generation trigger signal, and receiving the simulated reflection signal from the third time point in the SAR simulator.

According to an example, the SAR simulator may further include generating a signal processing clock signal and a local oscillation signal and outputting the signal processing clock signal and the local oscillation signal to the ground target reflection simulator, and outputting the simulated reflection signal comprises the signal processing clock signal. Converting a simulated reflection digital signal corresponding to the ground target simulation data into a simulated reflection baseband signal using , outputting the simulated reflection baseband signal in response to the signal generation trigger signal, and the local oscillation signal and generating the simulated reflection signal from the simulated reflection baseband signal using

According to another example, the first point of time is a point in time when the shooting start time of the SAR shooting time and the simulation time are equal, the second point of time is a point in time obtained by subtracting the transmission delay time from the third point in time, and the third point in time The point of view may be a point of time obtained by adding the reflection delay time to the first point of time.

According to another example, the signal generation trigger signal may be a signal that causes the ground target reflection simulator to generate a simulated reflection baseband signal at a time point before the transmission delay time from the third time point.

As a technical means for achieving the above-described technical problems, a computer program according to an aspect of the present invention is stored in a medium to execute the synthetic aperture radar simulation method described above using a computing device.

Advantages and/or features of the present invention, and methods of achieving them, will become apparent with reference to the following preferred embodiments and drawings.

According to the present invention, by simulating the SAR by changing the signal characteristics of various SARs, such as motion parameters for the position and speed of the SAR, pulse repetition period, and frequency, instead of field tests that require high costs and a lot of time, laboratory tests Through repetitive experiments in a short period of time at low cost, it is possible to collect ground target return signal data collected in actual operation of SAR or similar virtual data.

1 schematically shows a block diagram of a synthetic aperture radar simulation system according to the present invention.
2 schematically illustrates a simulation process of a synthetic aperture radar simulation system according to an embodiment of the present invention.
Figure 3 shows a flow chart for explaining the synthetic aperture radar simulation method according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention in detail, the terms or words used in this specification should not be construed unconditionally in a conventional or dictionary sense, and in order for the inventor of the present invention to explain his/her invention in the best way Concepts of various terms can be appropriately defined and used. Furthermore, it should be noted that these terms or words should be interpreted as meanings and concepts consistent with the technical idea of the present invention. That is, the terms used in this specification are only used to describe preferred embodiments of the present invention, and are not intended to specifically limit the contents of the present invention. It should be noted that these terms are terms defined in consideration of various possibilities of the present invention.

In this specification, singular expressions may include plural expressions unless the context clearly indicates otherwise. Similarly, it should be noted that even if expressed in plural, it may include a singular meaning.

In this specification, when an element is described as being “connected” to another element, this includes not only the case of being “directly connected” but also the case of being “indirectly connected” with another element intervening therebetween. When an element "includes" another element, this means that it may further include another element without excluding another element in addition to the other element unless otherwise stated.

In addition, the terms "first" and "second" described in the specification, claims, and drawings of the present invention are for distinguishing similar objects, and are not intended to indicate a specific order or precedence order.

Moreover, in the specification of the present invention, terms such as "... unit", "... unit", "module", and "device", if used, mean a unit capable of processing one or more functions or operations. It should be noted that this may be implemented in hardware or software, or a combination of hardware and software.

Hereinafter, in describing the present invention, detailed descriptions of known technologies including configurations that may unnecessarily obscure the subject matter of the present invention, for example, the prior art, may be omitted.

1 schematically shows a block diagram of a synthetic aperture radar (SAR) simulation system according to the present invention.

Referring to FIG. 1, the SAR simulation system 10 includes a simulation operation controller 100, a SAR simulator 200, and a ground target reflection simulator 300.

The simulation controller 100 generates SAR task data (SMD) including SAR shooting time, target location, and transmission delay time, generates simulation time and location information (STPI), and in the SAR task data (SMD) Acquire corresponding ground target simulation data (TSD). The SAR simulator 200 receives the SAR task data (SMD), determines the simulated time and location based on the simulated time and location information (STPI), and determines the simulated time and simulated location based on the simulated time and SAR shooting time from a first point in time. SAR signals (SARs) are output, and a signaling trigger signal (SOT) is output at a second time point. The ground target reflection simulator 300 receives ground target simulation data TSD and outputs a simulated reflection signal SRS corresponding to the ground target simulation data TSD in response to a signal generation trigger signal SOT. The SAR simulator 200 determines a third viewpoint based on the first viewpoint based on the reflection delay time determined based on the target position and the simulated position, receives a simulated reflection signal (SRS) from the third viewpoint, The second time point is determined earlier than the third time point by a transmission delay time.

The SAR simulator 200 may be a SAR device mounted on and operated in an air vehicle such as an artificial satellite, an aircraft, or an unmanned aerial vehicle. The SAR simulator 200 may be a simplified SAR device implementing only the main functions of SAR to simulate SAR. The SAR device is a radar system that sequentially shoots radar waves from the air to the ground or the sea, and then processes the minute time difference in which the radar waves are reflected on curved surfaces and returns to create a topographical map or observe the surface.

The simulator 100 generates SAR task data (SMD) and transfers the SAR task data (SMD) to the SAR simulator 200 so that the SAR simulator 200 performs the SAR task corresponding to the SAR task data (SMD). can be sent to The simulation controller 100 may generate simulation time and location information (STPI) together with the SAR task data (SMD) and transmit the generated simulation time and location information (STPI) to the SAR simulator 200.

SAR task data (SMD) may be generated in the simulation controller 100 according to the SAR task input by the user or operator. The SAR task data SMD may be data previously stored in the simulation controller 100 .

The SAR task data SMD may include SAR shooting time including SAR shooting start time and SAR shooting end time, target location, and transmission delay time. The transmission delay time may correspond to the time taken for the SAR simulator 200 to receive the simulated reflection signal (SRS) after the ground target reflection simulator 300 transmits the simulated reflection signal (SRS) in the SAR simulation system 10. The SAR task data SMD may further include SAR observation modes such as spotlight mode and stripmap mode, and SAR signal patterns such as pulse width and frequency.

The simulation operation controller 100 may transmit ground target simulation data TSD to the ground target reflection simulator 300 . The ground target simulation data (TSD) may be received from an external device and stored in advance in the storage device of the simulation operation controller 100 . The ground target simulation data (TSD) may be generated or synthesized by the simulation operation controller 100.

The ground target simulation data (TSD) may be generated by a SAR device and may be SAR data composed of pixels arranged in two dimensions, and each pixel of the SAR data may have a complex value.

According to an example, the simulated ground target data (TSD) may be SAR baseband digital data acquired by a SAR device for a target corresponding to a simulated target position at an actual position corresponding to a simulated position during actual SAR operation. For example, the ground target simulation data (TSD) may be SAR data of a target position actually acquired by a SAR device having substantially the same specifications as the SAR simulator 200, and SAR image processing is performed on the SAR data. Then, a SAR image of the target location can be generated. The ground target simulation data (TSD) may substantially correspond to data of a simulated digital signal (SDS) received by the simulation operation controller 100 from the SAR simulator 200.

According to another example, the simulator 100 receives 3D topographical data of a target location, synthesizes a target SAR image based on the 3D topographical data, and inversely processes the SAR image with respect to the target SAR image. Target simulation data (TSD) can be acquired. For example, the ground target simulation data (TSD) may be obtained by dividing the target SAR image into a distance direction and an azimuth direction and processing signals.

The simulation operation controller 100 may receive the simulated digital signal (SDS) from the SAR simulator 200 and synthesize a SAR image corresponding to the ground target simulation data (TSD). The SAR image may be a SAR image that the SAR simulation system 10 actually intends to simulate.

The SAR simulator 200 may generate and output SAR signals (SARs) based on the SAR task data (SMD) and the simulation time and location information (STPI) received from the simulation operation controller 100. SAR signals (SARs) may be output through the first antenna 240 .

The SAR simulator 200 may receive simulated reflection signals (SRS) from the ground target reflection simulator 300 in response to the SAR signals (SARs). The simulated reflection signal (SRS) may be received by the second antenna 250 of the SAR simulator 200. The SAR simulator 200 may generate a simulated digital signal SDS from the simulated reflection signal SRS and transmit it to the simulation controller 100.

A SAR signal (SARs) is the same signal emitted by a real SAR device towards a ground target according to the SAR task data (SMD), while a simulated return signal (SRS) is a signal actually emitted by a real SAR device toward a ground target. It may be a signal that is actually the same as a signal reflected from an actual ground target and received by an actual SAR device.

The SAR simulator 200 may generate and transmit a signal generation trigger signal (SOT), a signal processing clock signal (CS), and a local oscillation signal (LO) to the ground target reflection simulator 300.

The ground target reflection simulator 300 receives ground target simulation data (TSD) from the simulation operation controller 100 and generates a simulated reflection signal (SRS) corresponding to the ground target simulation data (TSD) to generate a SAR simulator ( 200) can be sent. The ground target reflection simulator 300 uses the ground target simulation data (TSD) received from the simulation operation controller 100, the signal generation trigger signal (SOT) received from the SAR simulator 200, and the signal processing clock signal (CS) , and a simulated reflection signal (SRS) may be generated based on the local oscillation signal (LO) and transmitted to the SAR simulator 200. The ground target reflection simulator 300 may transmit the simulated reflection signal (SRS) to the SAR simulator 200 through the third antenna 340.

2 shows a specific block diagram of a synthetic aperture radar (SAR) simulation system according to an embodiment.

Referring to FIG. 2 , the SAR simulation system 10 may include a simulation operation controller 100, a SAR simulator 200, and a ground target reflection simulator 300.

The simulation operation controller 100 may include a SAR task generator 110, a time location information generator 120, a ground target simulation data storage unit 130, and an image generator 140.

The SAR task generator 110 may generate and transmit SAR task data SMD to the SAR control unit 210 . The SAR task data SMD may be data previously stored in the SAR task generator 110, and may include SAR shooting time, target location, and transmission delay time. The SAR task generator 110 may transmit SAR task data (SMD) including the SAR simulation time, the location of the target to be simulated, and the characteristics of the SAR signal to be simulated to the SAR control unit 210 .

The time location information generator 120 may generate simulated time and location information (STPI) for determining the simulated time and simulated location of the SAR simulator 200 and transmit it to the SAR control unit 210. According to one example, if it is to simulate the operation environment of the SAR mounted on the artificial satellite, the time location information generating unit 120 may generate simulated time and location information (STPI) based on the trajectory of the artificial satellite. According to another example, if it is to simulate the operating environment of the SAR mounted on the aircraft, the time location information generation unit 120 may generate simulated time and location information (STPI) based on the flight path of the aircraft.

The ground target simulation data storage unit 130 may store ground target simulation data (TSD). The ground target simulation data storage unit 130 receives the SAR task data (SMD) from the SAR task generator 110 and transmits the ground target simulation data (TSD) corresponding to the SAR task data (SMD) to the ground target simulation data reception unit. (310).

The image generator 140 receives the simulated digital signal (SDS) from the SAR control unit 210 and performs SAR image processing on the simulated digital signal (SDS) to determine the SAR of the target determined by the SAR task data (SMD). Images can be synthesized. The simulated digital signal SDS received by the image generator 140 may be substantially the same as the simulated ground target data TSD transmitted to the simulated ground target data receiver 310 .

The SAR simulator 200 may include a SAR controller 210, a first RF transceiver 220, and a signal transceiver 230. The SAR simulator 200 may further include a first antenna 240 and a second antenna 250. The first antenna 240 may output SAR signals (SARs), and the second antenna 250 may receive the simulated reflection signal (SRS) transmitted from the ground target reflection simulator 300. The first antenna 240 and the second antenna 250 are functionally separated, and may actually be one antenna device.

The SAR control unit 210 receives SAR task data (SMD) and simulated time and location information (STPI) from the simulation operation controller 100, and calculates the simulated time and simulated location based on the simulated time and location information (STPI). can decide

The SAR control unit 210 may determine a first time point, a second time point, and a third time point based on the SAR task data (SMD), simulated time and simulated location. The first time point is a time point at which the SAR simulator 200 outputs SAR signals (SARs), and may be a time point when the shooting start time of the SAR shooting time and the simulation time point become the same.

The reflection delay time may be determined based on the distance between the simulated location and the target location. The reflection delay time may be a time from a time when an actual SAR device outputs a SAR signal at a simulated location to a time when the SAR signal is reflected from a ground target and received by the SAR device. According to an example, the reflection delay time may be included in the SAR task data SMD. According to another example, the reflection delay time may be determined by the SAR control unit 210 based on the simulated location and the target location.

The third viewpoint may be determined by adding the reflection delay time to the first viewpoint. The third point in time may be a point in time when the signal transceiver 230 starts receiving the simulated baseband signal (SBS) from the first RF transceiver 220 . For example, the third time point coincides with the time when the SAR signals (SARs) output by the actual SAR device are reflected from the ground target and arrive at the SAR device again, so that the SAR simulator 200 receives the simulated return signal (SRS). It may be time to start doing it.

The second point in time may be a point in time obtained by subtracting the transmission delay time from the third point in time. The second time point may be a time point when the signal transceiver 230 outputs the signal generation trigger signal SOT to the simulated reflection signal generator 320 . The transmission delay time is determined when the signal transceiver 230 receives the simulated baseband signal (SBS) after the simulated reflection signal generator 320 outputs the simulated reflection baseband signal (SRBS) in the SAR simulation system 10. It may correspond to the time required to , and if the distance between the SAR simulator 200 and the ground target reflection simulator 300 does not change, it may be a fixed constant value. The transmission delay time is the time at which the second RF transceiver 330 generates a simulated reflection signal (SRS) from the simulated reflection baseband signal (SRBS) and outputs the simulated reflection signal (SRS) through the third antenna 340, the simulated reflection signal (SRS) is It may include a time for transmission from the third antenna 340 to the second antenna 250 and a time for converting the simulated reflection signal (SRS) received from the second antenna 250 into a simulated baseband signal (SBS). .

The SAR controller 210 may control the first RF transceiver 220 to output SAR signals (SARs) from a first time point. The SAR controller 210 may control the signal transceiver 230 to transmit the signal generation trigger signal SOT to the simulated reflection signal generator 320 at the second time point. The SAR control unit 210 may control the signal transmission/reception unit 230 to receive the simulated baseband signal (SBS) from the third point in time.

The first RF transceiver 220 may generate the local oscillation signal LO and transmit it to the second RF transceiver 330 of the ground target reflection simulator 300 . For example, the first RF transceiver 220 may receive a local oscillation signal (LO) having an LO frequency from a local oscillator (LO) and transmit it to the second RF transceiver 330 .

According to an example, the first RF transceiver 220 may output SAR signals (SARs) from a first time point using the local oscillation signal (LO). The first RF transceiver 220 receives SAR baseband signals (SARbs), which are baseband signals of SAR signals (SARs), from the SAR control unit 210, and receives local oscillation signals (LO) in the SAR baseband signals (SARbs). ) can be synthesized to output SAR signals (SARs). The first RF transmission/reception unit 220 converts the simulated reflection signal (SRS) received from the ground target reflection simulator 300 into a simulated baseband signal (SBS) using the local oscillation signal (LO), and the signal transmission/reception unit (230).

The signal transmission/reception unit 230 may generate a signal generation trigger signal (SOT) and a signal processing clock signal (CS) and transmit them to the simulated reflection signal generator 320 of the ground target reflection simulator 300. The signal transceiver 230 may transmit the signal generation trigger signal SOT to the simulated reflection signal generator 320 at the second time point determined by the SAR control unit 210 . The signal generation trigger signal SOT is a signal for generating the simulated reflection baseband signal SRBS from the simulated reflection signal generator 320 at a time point before the transmission delay time from the third time point, and the signal processing clock signal CS is It may be a signal used to synchronize the simulated reflection digital signal (SRDS) and the simulated digital signal (SDS).

The signal transceiver 230 converts the simulated baseband signal (SBS) received from the first RF transceiver 220 into a digital simulated digital signal (SDS) using the signal processing clock signal (CS), and The digital signal SDS may be transmitted to the SAR controller 210.

The ground target reflection simulator 300 may include a ground target simulation data receiver 310, a simulated reflection signal generator 320, and a second RF transceiver 230. The ground target reflection simulator 300 may further include a third antenna 340 for transmitting a simulated reflection signal (SRS) to the SAR simulator 200.

The ground target simulation data receiving unit 310 may receive the ground target simulation data TSD from the ground target simulation data storage unit 130 and output a simulated reflection digital signal SRDS corresponding to the ground target simulation data TSD. there is. For example, the simulated ground target data receiver 310 may modulate the simulated ground target data TSD to generate a simulated reflection digital signal SRDS in digital form. The ground target simulated data receiver 310 may transmit the simulated reflection digital signal SRDS to the simulated reflection signal generator 320 .

The simulated reflection signal generator 320 converts the simulated reflection digital signal SRDS into a simulated reflection baseband signal SRBS and outputs the simulated reflection baseband signal SRBS in response to the signal generation trigger signal SOT. can According to an example, the simulated reflection signal generator 320 receives the signal processing clock signal CS from the signal transmission/reception unit 230, and generates the simulated reflection digital signal SRDS using the signal processing clock signal CS. It can be converted to simulated reflection baseband signal (SRBS) in analog form. For example, the simulated reflection signal generator 320 converts the simulated reflection digital signal SRDS into a simulated reflection baseband signal SRBS by synchronizing with the signal processing clock signal CS received from the signal transmission/reception unit 230. can do.

The simulated reflection signal generator 320 receives the signal generation trigger signal SOT from the signal transmission/reception unit 230 at a second time point, and generates the simulated reflection baseband signal SRBS in response to the signal generation trigger signal SOT. It can be transmitted to the second RF transceiver 330. For example, the simulated reflection signal generation unit 320 simulates the simulation with the second RF transceiver 330 at a time point before the signal transmission/reception unit 230 receives the simulated baseband signal (SBS) by a transmission delay time. A reflective baseband signal (SRBS) may be transmitted.

The second RF transceiver 330 may generate a simulated reflected signal (SRS) corresponding to the simulated reflected baseband signal (SRBS) and output it to the SAR simulator 200 . According to an example, the second RF transceiver 330 receives the local oscillation signal (LO) generated by the first RF transceiver 220, and receives the simulated reflection baseband signal received from the simulated reflection signal generator 320. The simulated reflection signal SRS may be generated by combining the local oscillation signal LO with the signal SRBS. The second RF transceiver 330 may transmit the simulated reflection signal SRS to the SAR simulator 200 through the third antenna 340 . The simulated reflected signal (SRS) may be an RF signal.

In this example, the SAR simulator 200 and the ground reflector simulator 300 are illustrated as transmitting and receiving simulated reflection signals (SRS) through the second antenna 250 and the third antenna 340, but the SAR simulation The machine 200 and the ground target reflection simulator 300 may transmit and receive simulated reflection signals (SRS) through cables. In this case, the second antenna 250 and the third antenna 340 may be replaced with cables directly connected between the first RF transceiver 220 and the second RF transceiver 330 .

Figure 3 shows a flow chart for explaining the operation environment simulation method according to the present invention.

Referring to FIG. 3 , the SAR simulator 200 receives data required for SAR simulation from the simulation operation controller 100 and outputs SAR signals (SARs). Thereafter, the SAR simulator 200 receives simulated reflection signals (SRS) corresponding to the SAR signals (SARs) from the ground target reflection simulator 300 and transmits them to the simulation controller 100, and the simulation controller 100 ) may synthesize SAR images corresponding to the simulated reflection signal (SRS).

In the simulation operation controller 100, SAR task data (SMD) including SAR shooting time, target location, and transmission delay time, and simulation time and location information (STPI) are generated, and corresponding to the SAR task data (SMD) Ground target simulation data (TSD) can be acquired (S10). The simulation controller 100 may generate a SAR task based on the generated SAR task data (SMD) and simulation time and location information (STPI) and transmit it to the SAR simulator 200. The simulation operation controller 100 may transmit the acquired ground target simulation data (TSD) to the ground target reflection simulator 300 .

In the SAR simulator 200, it is possible to determine the simulated time and simulated location based on the simulated time and position information (STPI), and output SAR signals (SARs) from a first time point based on the simulated time and SAR shooting time. Yes (S20).

In the SAR simulator 200, a third viewpoint is determined based on the first viewpoint based on the reflection delay time determined based on the distance between the target position and the simulated position, and the second viewpoint is faster than the third viewpoint by the transmission delay time. A viewpoint may be determined (S30). The first time point, the second time point, and the third time point may be determined in advance by the SAR simulator 200.

The SAR simulator 200 may output a signal generation trigger signal SOT to the ground target reflection simulator 300 at a second time point (S40). The ground target reflection simulator 300 receives ground target simulation data (TSD) and outputs a simulated reflection signal (SRS) corresponding to the ground target simulation data (TSD) in response to a signal generation trigger signal (SOT). It can (S50). For example, the point in time at which the ground reflectance simulator 300 outputs the simulated reflection signal SRS may be between the second point in time and the third point in time.

The SAR simulator 200 may receive the simulated reflection signal SRS from the third point in time (S60). The third point in time may be a point in time when the SAR signal is reflected from the ground target and received by the SAR device during actual SAR operation.

In the simulation operation controller 100, the SAR image corresponding to the simulated reflection signal (SRS) can be synthesized (S70). The SAR image is a SAR image to be actually simulated, and may be substantially the same as the image of ground target simulation data (TSD).

In the above, various preferred embodiments of the present invention have been described with some examples, but the description of various embodiments described in the "Specific Contents for Carrying Out the Invention" section is only exemplary, and the present invention Those skilled in the art will understand from the above description that the present invention can be practiced with various modifications or equivalent implementations of the present invention can be performed.

In addition, since the present invention can be implemented in various other forms, the present invention is not limited by the above description, and the above description is intended to complete the disclosure of the present invention and is common in the technical field to which the present invention belongs. It is only provided to completely inform those skilled in the art of the scope of the present invention, and it should be noted that the present invention is only defined by each claim of the claims.

10:
100: simulated operation controller
110: SAR task generation unit
120: time location information generation unit
130: Ground target simulation data storage unit
140: image generator
200: SAR simulator
210: SAR control unit
220: first RF transceiver
230: signal transmission and reception unit
240: first antenna
250: second antenna
300: ground target reflection simulator
310: ground target simulation data receiver
320: simulated reflection signal generator
330: second RF transceiver
340: third antenna

Claims (15)

In the synthetic aperture radar (SAR) simulation system,
A simulation controller for generating SAR task data including SAR shooting time, target location, and transmission delay time, generating simulation time and location information, and obtaining ground target simulation data corresponding to the SAR task data;
Receive the SAR task data, determine a simulated time and a simulated location based on the simulated time and location information, output a SAR signal from a first time point based on the simulated time and the SAR shooting time, and output a SAR signal from a second time point based on the simulated time and location information. a SAR simulator that outputs a signal generation trigger signal to; and
A ground target reflection simulator for receiving the ground target simulation data and outputting a simulated reflection signal corresponding to the ground target simulation data in response to the signal generation trigger signal;
The SAR simulator determines a third time point based on the first time point based on a reflection delay time determined based on the target location and the simulated location, receives the simulated reflection signal from the third time point, and Characterized in that the second point in time is determined faster than the third point in time by the transmission delay time,
Characterized in that the simulation operation controller previously stores SAR baseband digital data actually acquired by the SAR device for the target location at the simulated location as the ground target simulation data. Synthetic aperture radar simulation system. delete According to claim 1,
The simulation operation controller obtains the ground target simulation data by receiving 3D terrain data of the target location, synthesizing a target SAR image based on the 3D terrain data, and processing an inverse SAR image with respect to the target SAR image. A synthetic aperture radar simulation system, characterized in that. According to claim 1,
The ground target reflection simulator,
a ground target simulation data receiving unit for receiving the ground target simulation data and outputting a simulated reflection digital signal corresponding to the ground target simulation data;
a simulated reflection signal generating unit converting the simulated reflection digital signal into a simulated reflection baseband signal and outputting the simulated reflection baseband signal in response to the signal generation trigger signal; and
A synthetic aperture radar simulation system comprising a second RF transceiver for generating the simulated reflection signal corresponding to the simulated reflection baseband signal and outputting the simulated reflection signal to the SAR simulator. According to claim 4,
The SAR simulator includes a SAR control unit,
The SAR control unit,
Determining the first time point at which a shooting start time of the SAR imaging time and the simulated time are the same;
determining the reflection delay time based on a distance between the simulated location and the target location;
determining the third viewpoint by adding the reflection delay time to the first viewpoint;
A synthetic aperture surface radar simulation system, characterized in that for determining the second point of view by subtracting the transmission delay time from the third point of time. According to claim 4,
The SAR simulator further includes a first RF transceiver,
The first RF transceiver unit
generate a local oscillation signal;
outputting the SAR signal from the first time point using the local oscillation signal;
A synthetic aperture radar simulation system, characterized in that for converting the simulated reflection signal into a simulated baseband signal using the local oscillation signal. According to claim 6,
The first RF transceiver outputs the local oscillation signal to the ground target reflection simulator,
The second RF transceiver generates the simulated reflection signal from the simulated reflection baseband signal using the local oscillation signal generated by the first RF transceiver. According to claim 1,
The SAR simulator further includes a signal transceiver,
The signal transceiver unit,
generating a signal processing clock signal and converting the simulated baseband signal into a simulated digital signal using the signal processing clock signal;
The synthetic aperture surface radar simulation system, characterized in that for outputting the signal generation trigger signal to the ground target reflection simulator at the second time point. According to claim 8,
The signal transceiver outputs the signal processing clock signal to the ground target reflection simulator,
The simulated reflection signal generating unit converts the simulated reflection digital signal into a simulated reflection baseband signal using the signal processing clock signal generated by the signal transmitting and receiving unit. According to claim 1,
The SAR simulator generates a simulated digital signal from the simulated reflection signal;
The simulation operation controller synthesizes the SAR image of the target position by performing SAR image processing on the simulated digital signal. As a SAR simulation method performed by a synthetic aperture radar (SAR) simulator, a ground target reflection simulator, and a simulation operation controller,
In the simulation operation controller, generating SAR task data including SAR shooting time, target location, and transmission delay time, simulation time and location information, and obtaining ground target simulation data corresponding to the SAR task data;
In the SAR simulator, determining a mock time and a simulated location based on the simulated time and location information, and outputting a SAR signal from a first time point based on the simulated time and the SAR shooting time;
In the SAR simulator, a third time point is determined based on the first time point based on a reflection delay time determined based on a distance between the target location and the simulated location, and the transmission delay time is longer than the third time point. quickly determining a second point in time;
outputting a signal generation trigger signal from the SAR simulator to the ground target reflection simulator at the second time point;
receiving the ground target simulation data and outputting a simulated reflection signal corresponding to the ground target simulation data in response to the signal generation trigger signal; and
In the SAR simulator, receiving the simulated reflection signal from the third time point;
The synthetic aperture radar simulation method, characterized in that the simulation operation controller stores in advance the SAR baseband digital data actually acquired by the SAR device for the target location at the simulated location as the ground target simulation data. According to claim 11,
Further comprising generating a signal processing clock signal and a local oscillation signal in the SAR simulator and outputting them to the ground target reflection simulator,
The step of outputting the simulated reflection signal,
converting a simulated reflection digital signal corresponding to the ground target simulation data into a simulated reflection baseband signal using the signal processing clock signal;
outputting the simulated reflection baseband signal in response to the signaling trigger signal; and
and generating the simulated reflection signal from the simulated reflection baseband signal using the local oscillation signal. According to claim 11,
The first time point is a time point when the shooting start time of the SAR shooting time and the simulation time are the same;
The second point in time is a point in time obtained by subtracting the transmission delay time from the third point in time,
The synthetic aperture surface radar simulation method, characterized in that the third point of view is a point of time obtained by adding the reflection delay time to the first point of view. According to claim 11,
The signal generation trigger signal is a signal that causes the ground target reflection simulator to generate a simulated reflection baseband signal at a time point before the transmission delay time from the third time point. A computer program stored in a medium to execute the method of any one of claims 11 to 14 using a computing device.

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