CN111766579A - SAR air-ground combined processing method, airborne SAR and ground controller - Google Patents
SAR air-ground combined processing method, airborne SAR and ground controller Download PDFInfo
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- CN111766579A CN111766579A CN202010600099.4A CN202010600099A CN111766579A CN 111766579 A CN111766579 A CN 111766579A CN 202010600099 A CN202010600099 A CN 202010600099A CN 111766579 A CN111766579 A CN 111766579A
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- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/9004—SAR image acquisition techniques
- G01S13/9011—SAR image acquisition techniques with frequency domain processing of the SAR signals in azimuth
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Abstract
An SAR air-ground combined processing method is applied to airborne SAR and comprises the following steps: the method comprises the steps of receiving a first mode instruction sent by a ground controller, obtaining a first image of a detection target according to the first mode instruction, downloading the first image to the ground controller, enabling the ground controller to analyze the first image to generate a second mode instruction, sending the second mode instruction, receiving the second mode instruction, carrying out image processing on a target area which is interested by a user in the first image according to the second mode instruction to obtain a second image of the target area, and downloading the second image to the ground controller. The method can realize real-time image generation in the data acquisition process of the airborne SAR and real-time data exchange with the ground controller, thereby improving the timeliness of the data and simultaneously enabling the airborne SAR to adjust the working state in time according to the indication of the ground controller in the working process.
Description
Technical Field
The disclosure relates to the technical field of aerial remote sensing, in particular to an SAR air-ground combined processing method, an airborne SAR and a ground controller.
Background
In recent years, with the development of aerial remote sensing technology, more and more civil fields begin to use remote sensing technology, and Synthetic Aperture radars (SAR for short), which are one of mature remote sensing technologies, begin to play an important role in various application scenes by virtue of all-weather working capacity of the Synthetic Aperture radars all day long. In order to acquire a radar image with higher precision, the obtained remote sensing data can describe targets more accurately, such as detection of farmlands, roads and bridges and various buildings, and in order to capture the characteristics of moving targets, ground information processing personnel can master the state and motion information of the detected targets in real time, typical moving targets are vehicles, ships, floating oil on the sea surface and the like, and an airborne SAR system is developing towards the direction of high resolution and high timeliness.
However, when the conventional airborne SAR detects the ground, because the weight, the volume and the power consumption of the installed load of the airborne platform are limited, the onboard real-time processing of a large amount of imaging data and the execution of a complex algorithm cannot be realized, only echo signals of detection signals can be collected in real time, but the onboard SAR cannot communicate with a ground controller in real time, the data collected during flight are unloaded to a ground processing system for imaging processing after the aircraft lands on the ground, the data timeliness is poor, the image can not be obtained while detection, the working state can not be adjusted in time according to the image data, and the optimal detection effect can not be realized in time aiming at a moving target.
Disclosure of Invention
Technical problem to be solved
The invention provides an SAR air-ground combined processing method, an airborne SAR and a ground controller, which at least partially solve the technical problems.
(II) technical scheme
The disclosure provides an SAR air-ground combined processing method, which is applied to an airborne SAR and comprises the following steps: receiving a first mode instruction sent by a ground controller; acquiring a first image of a detection target according to the first mode instruction; downloading the first image to the ground controller, so that the ground controller analyzes the first image, generates a second mode instruction and sends the second mode instruction; receiving the second mode instruction; according to the second mode instruction, performing real-time fine imaging or ISAR processing on a target area which is interested by a user in the first image to obtain a second image of the target area; and downloading the second image to the ground controller.
Optionally, the first mode instruction at least includes a start operating time of the airborne SAR, a detection target, and a first operating parameter, and acquiring a first image of the detection target according to the first mode instruction includes: after the working start time is reached, applying the first working parameter; transmitting an electromagnetic wave signal to the detection target; receiving an echo signal; and generating the first image according to the echo signal.
Optionally, the second mode instruction at least includes coordinates of a target area of interest in the first image and a second working parameter required for optimizing the target area, and the performing real-time fine imaging or ISAR processing on the first image according to the second mode instruction to obtain a second image of the target includes: identifying a target area from the first image according to the coordinates; calling a preset image processing algorithm according to the second working parameter; and executing the image processing algorithm, and combining the echo signals to obtain a second image of the target area.
Optionally, before the first image and the second image are downloaded to the ground controller, data compression processing is performed.
The disclosure provides, in another aspect, an SAR air-ground combined processing method applied to a ground controller, including: sending a first mode instruction to an airborne SAR according to user requirements, and enabling the airborne SAR to acquire a first image of a detection target according to the first mode instruction; receiving the first image; analyzing the first image to generate a second mode instruction; sending the second mode instruction to the airborne SAR, and enabling the airborne SAR to perform real-time fine imaging or ISAR processing on a target area which is interested by a user in the first image according to the second mode instruction so as to obtain a second image of the target area; the second image is received.
Optionally, the first mode instruction at least includes a start operating time of the onboard SAR, the detection target, and a first operating parameter for acquiring the first image, and the first mode instruction is generated according to a user requirement.
Optionally, the second mode instruction at least includes coordinates of the target area and a second working parameter required for optimizing the target area, and the analyzing the first image and generating the second mode instruction includes: searching the target area in the first image according to the user requirement; judging whether the definition of the target area meets the requirements of a user; if the definition of the target area does not meet the user requirement, acquiring the coordinates of the target area and optimizing a second working parameter required by the target area; generating the second mode instruction.
Another aspect of the present disclosure provides an airborne SAR comprising: the first instruction receiving module is used for receiving a first mode instruction sent by the ground controller; the first image acquisition module is used for acquiring a first image of a detection target according to the first mode instruction; the first image transmission module is used for downloading the first image to the ground controller, so that the ground controller analyzes the first image, generates a second mode instruction and sends the second mode instruction; a second instruction receiving module, configured to receive the second mode instruction; the second image acquisition module is used for performing real-time fine imaging or ISAR processing on a target area which is interested by a user in the first image according to the second mode instruction so as to obtain a second image of the target area; and the second image transmission module is used for transmitting the second image to the ground controller.
Optionally, the apparatus further comprises: and the image data compression module is used for performing data compression processing on the first image and the second image before the first image and the second image are downloaded to the ground controller.
Another aspect of the present disclosure provides a floor controller, including: the first instruction sending module is used for sending a first mode instruction to an airborne SAR according to user requirements, so that the airborne SAR obtains a first image of a detection target according to the first mode instruction; a first image receiving module for receiving the first image; the first image analysis module is used for analyzing the first image and generating a second mode instruction; a second instruction sending module, configured to send the second mode instruction to the airborne SAR, so that the airborne SAR performs real-time fine imaging or ISAR processing on a target area, which is interested by a user, in the first image according to the second mode instruction, so as to obtain a second image of the target area; and the second image receiving module is used for receiving the second image.
The SAR air-ground combined processing method, the airborne SAR and the ground controller can realize that the airborne SAR collects data of a detection target in the flight process, generate an image of the detection target in real time, send the image to the ground controller in real time, enable the ground controller to analyze the image in time, feed target area coordinates interested by a user back to the SAR, enable the SAR to process the image of the target area by using an algorithm according to the collected data, obtain a second image of the target area, and send the image to the ground controller in real time, realize real-time acquisition of the target image and real-time data transmission, enable the airborne SAR to transmit data with the ground controller in time in the working process, and improve the working efficiency.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
fig. 1 schematically illustrates a flowchart of a SAR air-ground joint processing method provided by an embodiment of the present disclosure;
fig. 2 schematically illustrates a flowchart of another SAR air-ground joint processing method provided by the embodiment of the present disclosure;
fig. 3 schematically illustrates a schematic diagram of a SAR air-ground joint processing mode provided by an embodiment of the present disclosure;
fig. 4 schematically illustrates a topology diagram of a SAR air-ground joint processing mode provided by an embodiment of the present disclosure;
fig. 5 schematically illustrates an airborne SAR provided by an embodiment of the present disclosure;
fig. 6 schematically illustrates a structural diagram of an airborne SAR provided by an embodiment of the present disclosure;
fig. 7 schematically illustrates a processor diagram of an onboard SAR provided by an embodiment of the present disclosure;
fig. 8 schematically illustrates an operation timing diagram of an onboard SAR provided by an embodiment of the present disclosure;
fig. 9 schematically illustrates a ground controller provided by an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The words "a", "an" and "the" and the like as used herein are also intended to include the meanings of "a plurality" and "the" unless the context clearly dictates otherwise. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
As shown in fig. 1, fig. 1 schematically shows a flowchart of a SAR air-ground joint processing method provided by an embodiment of the present disclosure, which is applied to an airborne SAR, and includes S110 to S160.
And S110, receiving a first mode command sent by the ground controller.
In this embodiment, when the airborne SAR executes a flight task along with an airplane or a satellite, in order to enable the airborne SAR to provide data required by a pilot or ground staff at any time, the airborne SAR may receive an instruction of the ground controller in real time, the ground controller packages information such as the operating time, the ground and parameters of the airborne SAR into an instruction, the instruction is sent to the airborne SAR radar through a satellite relay communication link or a point-to-point communication link, and the airborne SAR executes a corresponding action according to the instruction sent by the ground controller, for example, selecting a detection target, adjusting a working mode according to the detection target, adjusting working parameters, and the like.
And S120, acquiring a first image of the detection target according to the first mode instruction.
In this embodiment, the first mode command at least includes a start operation time of the onboard SAR, a detection target, and a first operation parameter. According to the first mode instruction, a first image of the detection target is acquired, including S121-S124.
And S121, applying the first working parameter after the working start time is reached.
And S122, transmitting an electromagnetic wave signal to the detection target.
And S123, receiving the echo signal.
And S124, generating a first image according to the echo signal.
In the embodiment, the onboard SAR is started at a specified starting operation time according to a first mode command, and then starts to transmit the electromagnetic wave signal according to an operation parameter specified by the first mode command, wherein the first operation parameter comprises an operation parameter of an operation mode selected for the detection target. And generating a first image in real time according to the echo signal reflected by the detection target.
And S130, downloading the first image to the ground controller, so that the ground controller analyzes the first image, generates a second mode instruction, and sends the second mode instruction.
In this embodiment, after the airborne SAR generates the first image of the detection target, the image data is compressed to reduce the data transmission amount and improve the transmission efficiency, and then the compressed image data is sent to the ground controller. The ground controller receives the data, restores the data into a first image, and ground workers analyze the first image, search an interested area and targets in the radar image according to application requirements, wherein the interested area and the targets comprise but are not limited to large targets such as landforms, medium targets such as airports, bridges, roads and the like, and small targets such as automobiles and ships, and key information of the image is obtained from the targets, such as whether a barrier lake exists in a mountain area, whether a certain type of vehicle appears in a driving-forbidden area, whether a fishing boat appears in a fishing-forbidden area, and the like. If the radar image has no interested region and no target, the combined processing flow is ended; and if the interesting region and the target are found, marking is carried out to obtain the coordinates of the interesting region and the target, and meanwhile, whether the definition degree of the image meets the application requirement or not is judged. If so, ending the combined processing flow; if the first image is not satisfied, in order to obtain a clear image, the radar imaging algorithms for sea-to-land and mountain land are slightly different, and the main process of the on-board real-time processing algorithm unified algorithm cannot identify the landform and the landform, so that the imaging result is possibly unclear, and therefore, the first image needs to be subjected to secondary processing by manually intervening and designating the processing algorithm.
S140, receiving a second mode instruction.
In this embodiment, for the region of interest and the target labeled by the ground data analyst, if the definition of the image does not meet the application requirement, the ground controller forms a second mode instruction with the coordinates and the related parameters of the target region, and uploads the second mode instruction to the airborne SAR radar through the data transmission link, so that the airborne SAR performs second processing on the first image. After the airborne SAR receives the second mode instruction, the instruction is firstly analyzed, so that a task is executed according to the instruction in the next step.
And S150, performing real-time fine imaging or ISAR processing on the target area interested by the user in the first image according to the second mode instruction to obtain a second image of the target area.
In this embodiment, the second mode instruction at least includes coordinates of a target area of interest in the first image and a second working parameter required for optimizing the target area, and the step S151 to step S153 includes performing real-time fine imaging or ISAR processing on the first image according to the second mode instruction to obtain a second image of the target.
And S151, identifying the target area from the first image according to the coordinates.
And S152, calling a preset image processing algorithm according to the second working parameter.
And S153, executing an image processing algorithm, and combining the echo signals to obtain a second image of the target area.
In the embodiment of the disclosure, the airborne SAR identifies the target region from the first image, and according to the type of the target region, a method for selecting a suitable algorithm, for example, optimizing an image of a mountain area and an image of a sea surface, is different, and due to insufficient definition of the target region in the first image, in combination with a previously detected echo signal, more detailed features in the target region can be extracted from the first image, so as to improve the definition of the target region. In the process, the airborne SAR does not need to transmit electromagnetic wave signals again, and only the image data is processed.
And S160, downloading the second image to the ground controller.
In this embodiment, after the airborne SAR obtains the second image of the target area, the data of the second image is compressed first, so that the transmission amount is reduced, and the transmission efficiency is improved. The ground controller receives the image downloaded by the airborne SAR for the second time, the image data is a clear image, ground workers extract the region of interest and target information, such as terrain and landform, target size and type characteristics and the like, from the image by analyzing the image, and then the remote sensing information with higher accuracy is comprehensively generated by combining the current other information, such as local geographic coordinates, time, target characteristic prior information and the like. Because the method completes the secondary processing of the image before the plane does not land, the timeliness of the remote sensing information is very high.
Optionally, the airborne SAR may further transmit the acquired echo signal to the ground controller in real time, so that the ground controller can generate the second image according to the direct echo signal.
The invention provides an SAR air-ground combined processing method, which can generate a first image in real time in the data acquisition process, compress the image and transmit the image to a ground controller, the transmission quantity is small, the ground controller analyzes the first image and then sends a second mode instruction for adjusting the image definition to an SAR according to the actual requirement, the SAR further improves the image definition according to the instruction, the SAR returns the image with improved definition to the ground controller again so that the ground controller can acquire a second image as soon as possible, the data transmission data quantity between the SAR and the ground controller is small, the data only comprises the first mode instruction, the second mode instruction, the compressed first image and the second image of a target area, and compared with the method that the original echo data is completely transmitted to the ground controller, the transmission efficiency is higher.
Fig. 2 schematically shows a flowchart of another SAR air-ground joint processing method provided by the embodiment of the present disclosure, which is applied to a ground controller, and includes S210 to S250.
S210, sending a first mode instruction to the airborne SAR according to user requirements, and enabling the airborne SAR to acquire a first image of the detection target according to the first mode instruction.
In this embodiment, when a ground worker or a pilot needs to acquire ground information, a ground controller sends a first mode instruction to the airborne SAR, so that the airborne SAR performs corresponding data acquisition work. The first mode command includes at least a start time of the airborne SAR, a probe target, and a first operating parameter for acquiring the first image.
S220, receiving the first image.
In this embodiment, after receiving the first mode instruction, the airborne SAR starts at the start working time according to the instruction, transmits a radar detection signal to a detection target, collects an echo signal returned by the detection target, generates a first image in real time according to the echo signal, and returns the first image to the ground controller.
And S230, analyzing the first image and generating a second mode instruction.
In this embodiment, the second mode command at least includes the coordinates of the target area and the second operating parameters required for optimizing the target area, and the step of analyzing the first image and generating the second mode command includes steps S231 to S234.
S231, searching a target area in the first image according to the user requirement.
And S232, judging whether the definition of the target area meets the requirement of the user.
And S233, if the definition of the target area does not meet the user requirement, acquiring the coordinates of the target area and optimizing a second working parameter required by the target area.
S234, a second mode command is generated.
In this embodiment, the ground controller or ground staff analyzes the first image and searches the radar image for the region of interest and the target according to the application requirements. If the radar image has no interested region and no target, the combined processing flow is ended; and if the interesting region and the target are found, marking is carried out, and whether the definition degree of the image meets the application requirement is judged. If so, ending the combined processing flow; if not, the following process flow is continued. Because the imaging algorithms for sea-to-land and mountain land are slightly different, in order to obtain a clear image, a second mode instruction is sent to the airborne SAR through the ground controller, so that the airborne SAR selects a proper algorithm to optimize the image according to the area or target which is interested by the user.
S240, sending a second mode instruction to the airborne SAR, and enabling the airborne SAR to perform real-time fine imaging or ISAR processing on the target area which is interested by the user in the first image according to the second mode instruction so as to obtain a second image of the target area.
In the embodiment of the disclosure, the ground controller sends a second mode instruction to the airborne SAR, so that the airborne SAR identifies a target region from the first image according to the second mode instruction, selects an appropriate algorithm according to the type of the target region, and extracts more detailed features in the target region from the selected algorithm in combination with the previously detected echo signal, thereby improving the definition of the target region. In the process, the airborne SAR does not need to transmit electromagnetic wave signals again, and only the image data is processed. After the image with improved definition is obtained, the airborne SAR returns the clear image to the ground controller.
And S250, receiving a second image.
In this embodiment, the image data received by the ground controller this time is a clear image, and the ground staff can extract the information of the region of interest and the target, such as the terrain and the landform, the size and type characteristics of the target, etc., from the image by analyzing the image, and then comprehensively generate the remote sensing information with higher accuracy by combining the current information of other aspects, such as the prior information of the local geographic coordinates, the time and the characteristics of the target, etc.
The invention provides an SAR air-ground combined processing method, which realizes real-time data acquisition and data transmission simultaneously by combining a ground controller and an airborne SAR, improves timeliness, improves the definition of images by carrying out secondary processing on the images, enables ground personnel to acquire ground information in time, adjusts the working state of the SAR in time and meets real-time requirements.
Fig. 3 and 4 more vividly show the work flow of the SAR air-ground joint processing method. As shown in fig. 3 and 4, the ground controller uploads instructions (first mode instructions) such as working modes and parameters to the airborne SAR, the SAR radar is started up, a remote measurement result is imaged, a first image is downloaded to the ground controller in real time, ground personnel receive and analyze the image (the analysis content includes but is not limited to large targets such as terrain and landform, medium targets such as airport, bridge, highway and the like, and small targets such as automobiles and ships and the like), key information of the image is obtained (for example, whether a damming lake exists in a mountainous area, a certain type of vehicle appears in a no-driving area, a fishing boat goes out of the sea in a no-driving area and the like), then the instructions (second mode instructions) such as the working modes and the parameters are sent to the airborne SAR, the airborne SAR carries out corresponding processing operations according to the instructions, the processed image is downloaded to the ground controller, so that the ground personnel receive the data and carry out secondary analysis on the data, and finally obtaining a high-accuracy image.
Fig. 5 schematically illustrates an airborne SAR provided in an embodiment of the present disclosure, including: the system comprises a first instruction receiving module 501, a first image acquiring module 502, a first image transmitting module 503, a second instruction receiving module 504, a second image acquiring module 505 and a second image transmitting module 506.
The first instruction receiving module 501 is configured to receive a first mode instruction sent by a ground controller.
The first image obtaining module 502 is configured to obtain a first image of the detection target according to the first mode instruction.
The first image transmission module 503 is configured to download the first image to the ground controller, so that the ground controller analyzes the first image, generates a second mode instruction, and sends the second mode instruction.
The second instruction receiving module 504 is configured to receive a second mode instruction.
And a second image obtaining module 505, configured to perform real-time fine imaging or ISAR processing on the target area, which is interested by the user, in the first image according to the second mode instruction, so as to obtain a second image of the target area.
A second image transmission module 506 for downloading the second image to the ground controller.
Optionally, the apparatus further comprises: an image data compression module 507.
And the image data compression module 507 is configured to perform data compression processing on the first image and the second image before the first image and the second image are downloaded to the ground controller to which the first image and the second image belong.
It is understood that the first instruction receiving module 501, the first image obtaining module 502, the first image transmitting module 503, the second instruction receiving module 504, the second image obtaining module 505, and the second image transmitting module 506 may be combined and implemented in one module, or any one of them may be split into a plurality of modules. Alternatively, at least part of the functionality of one or more of these modules may be combined with at least part of the functionality of the other modules and implemented in one module. According to the embodiment of the present invention, at least one of the first instruction receiving module 501, the first image obtaining module 502, the first image transmitting module 503, the second instruction receiving module 504, the second image obtaining module 505, and the second image transmitting module 506 may be at least partially implemented as a hardware circuit, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or may be implemented in hardware or firmware in any other reasonable manner of integrating or packaging a circuit, or implemented in a suitable combination of three implementations of software, hardware, and firmware. Alternatively, at least one of the first instruction receiving module 501, the first image obtaining module 502, the first image transmitting module 503, the second instruction receiving module 504, the second image obtaining module 505, and the second image transmitting module 506 may be at least partially implemented as a computer program module, which when executed by a computer, may perform the functions of the respective modules.
The traditional airborne SAR system consists of an antenna unit, a radio frequency unit, a data forming unit, a data recording unit, a power supply unit and a system control unit, wherein the antenna unit is used for receiving a control instruction of the system control unit, transmitting an electromagnetic wave signal to a space, receiving an electromagnetic wave reflected by the space and completing the conversion of the electromagnetic wave signal of the space and a microwave signal; the radio frequency unit is used for receiving a control instruction of the system control unit and completing the conversion from the microwave signal output by the antenna unit to the intermediate frequency signal; the data forming unit is used for receiving a control instruction of the system control unit and completing conversion from an intermediate frequency signal to a digital signal; the data recording unit is used for recording digital signals, the system control unit is used for controlling the functional parameters and various time sequences of the airborne SAR system, and the power supply unit is used for completing power supply and distribution of the system.
Fig. 6 schematically illustrates a structural diagram of an airborne SAR provided by an embodiment of the present disclosure. As shown in fig. 6, the onboard SAR provided by the embodiment of the present disclosure, on the basis of the conventional onboard SAR, further includes a real-time processing unit and a data transmission unit, wherein, the first instruction receiving module 501, the first image obtaining module 502, the first image transmission module 503, the second instruction receiving module 504, the second image obtaining module 505 and the second image transmission module 506 can be combined to form a real-time processing unit and a data transmission unit, for example, the real-time processing unit may at least include a first image obtaining module 502 and a second image obtaining module 505, the data transmission unit may at least include a first instruction receiving module 501, a first image transmission module 503, a second instruction receiving module 504, and a second image transmission module 506, the real-time processing unit completes high-performance data processing, and the data transmission unit realizes low-latency high-rate transmission of the processing result to the ground receiving station.
Compared with the traditional airborne SAR, the airborne SAR can realize real-time processing and transmission of data, and in order to realize the functions of the modules of the first instruction receiving module 501, the first image obtaining module 502, the first image transmission module 503, the second instruction receiving module 504, the second image obtaining module 505 and the second image transmission module 506, a real-time processing unit which has powerful functions and weight and volume and can be borne by an airborne platform is needed.
Fig. 7 schematically illustrates a processor diagram of an onboard SAR provided in an embodiment of the present disclosure. The real-time processing unit is composed of a high-performance processor matrix, the processor comprises a plurality of FPGAs and a plurality of DSPs, the controller is an ARM, and processing resources are configured and scheduled through the ARM processor. Referring to fig. 7, during data processing, data is input to two FPGAs, and the FPGAs receive ARM control to complete data routing and distribution. In the topological structure, 10 DSPs are used as processing cores, and various high-performance data processing is completed under the control of an ARM processor. There are two implementation approaches for high-performance data processing, the first one is parallel processing: splitting data to be processed into a plurality of data blocks, and then distributing the data blocks to each DSP in parallel through the FPGA to complete processing; secondly, flow line treatment: and optimizing and splitting the algorithm into a plurality of processing steps, realizing one algorithm step by each DSP, and then sequentially passing the data through a plurality of DSPs. Because the FPGA and the DSP are embedded processors and the weight, the volume and the power consumption of the FPGA and the DSP are both small, the real-time processing unit can be deployed on an onboard platform to complete real-time signal processing aiming at the SAR, and the real-time signal processing comprises but is not limited to SAR imaging, target detection, target identification, target refocusing and image compression.
The data transmission unit mainly comprises a micro data transmission antenna and a data compression module, wherein the micro data transmission antenna module completes the conversion from digital signals to electromagnetic wave signals, and the compression module completes the optimization of data quantity. The processing part in the data transmission unit mainly takes the FPGA as a main part, and the low-delay data transmission is realized by utilizing the processing structure of the FPGA parallel to the multi-flow water, so that the on-board processing result is ensured to be timely transmitted to the ground.
Fig. 8 schematically illustrates an operation timing diagram of an airborne SAR provided by an embodiment of the present disclosure. Taking the airborne SAR has several modes of real-time fine imaging, imaging playback and ISAR (inverse synthetic aperture radar imaging), the working timing diagram of the airborne SAR is obtained under several working modes. As shown in fig. 8, the workflow is briefly as follows: after the airborne SAR system is powered on, all units complete initialization, receive a first mode instruction sent by a ground controller, analyze the instruction, wherein the instruction comprises an imaging mode, namely one of real-time imaging, playback imaging and ship refocusing, the airborne SAR carries out program configuration according to instruction control, namely the function switching of the corresponding instruction is completed, then echo data is received, the processing of the corresponding mode is carried out, and the processing result is downloaded to the ground controller and distributed to a data analyzer after the processing.
Fig. 9 schematically illustrates a ground controller provided in an embodiment of the present disclosure, including: the system comprises a first instruction sending module 901, a first image receiving module 902, a first image analyzing module 903, a second instruction sending module 904 and a second image receiving module 905.
The first instruction sending module 901 is configured to send a first mode instruction to the airborne SAR according to a user requirement, so that the airborne SAR obtains a first image of the detection target according to the first mode instruction.
A first image receiving module 902, configured to receive a first image.
And a first image analysis module 903, configured to analyze the first image and generate a second mode instruction.
And a second instruction sending module 904, configured to send a second mode instruction to the airborne SAR, so that the airborne SAR performs real-time fine imaging or ISAR processing on the target area, which is interested by the user, in the first image according to the second mode instruction, so as to obtain a second image of the target area.
A second image receiving module 905, configured to receive a second image.
Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
It is understood that the first instruction sending module 901, the first image receiving module 902, the first image analyzing module 903, the second instruction sending module 904, and the second image receiving module 905 may be combined and implemented in one module, or any one of them may be split into a plurality of modules. Alternatively, at least part of the functionality of one or more of these modules may be combined with at least part of the functionality of the other modules and implemented in one module. According to the embodiment of the present invention, at least one of the first instruction sending module 901, the first image receiving module 902, the first image analyzing module 903, the second instruction sending module 904, and the second image receiving module 905 may be at least partially implemented as a hardware circuit, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or may be implemented in hardware or firmware in any other reasonable manner of integrating or packaging a circuit, or implemented in a suitable combination of three implementations of software, hardware, and firmware. Alternatively, at least one of the first instruction transmitting module 901, the first image receiving module 902, the first image analyzing module 903, the second instruction transmitting module 904, and the second image receiving module 905 may be at least partially implemented as a computer program module, and when the program is executed by a computer, the function of the corresponding module may be performed.
While the disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Accordingly, the scope of the present disclosure should not be limited to the above-described embodiments, but should be defined not only by the appended claims, but also by equivalents thereof.
Claims (10)
1. An SAR air-ground combined processing method is applied to an airborne SAR and is characterized by comprising the following steps:
receiving a first mode instruction sent by a ground controller;
acquiring a first image of a detection target according to the first mode instruction;
downloading the first image to the ground controller, so that the ground controller analyzes the first image, generates a second mode instruction and sends the second mode instruction;
receiving the second mode instruction;
according to the second mode instruction, performing real-time fine imaging or ISAR processing on a target area which is interested by a user in the first image to obtain a second image of the target area;
and downloading the second image to the ground controller.
2. The method according to claim 1, wherein the first mode command at least includes a start operating time of the onboard SAR, a detection target, and a first operating parameter, and the acquiring a first image of the detection target according to the first mode command includes:
after the working start time is reached, applying the first working parameter;
transmitting an electromagnetic wave signal to the detection target;
receiving an echo signal;
and generating the first image according to the echo signal.
3. The method according to claim 2, wherein the second mode instruction at least includes coordinates of a target area of user interest in the first image and a second operating parameter required for optimizing the target area, and wherein performing real-time fine imaging or ISAR processing on the first image according to the second mode instruction to obtain a second image of the target comprises:
identifying a target area from the first image according to the coordinates;
calling a preset image processing algorithm according to the second working parameter;
and executing the image processing algorithm, and combining the echo signals to obtain a second image of the target area.
4. The method of claim 1, wherein the first and second images are subjected to a data compression process before being downloaded to the ground controller.
5. A SAR air-ground combined processing method is applied to a ground controller and is characterized by comprising the following steps:
sending a first mode instruction to an airborne SAR according to user requirements, and enabling the airborne SAR to acquire a first image of a detection target according to the first mode instruction;
receiving the first image;
analyzing the first image to generate a second mode instruction;
sending the second mode instruction to the airborne SAR, and enabling the airborne SAR to perform real-time fine imaging or ISAR processing on a target area which is interested by a user in the first image according to the second mode instruction so as to obtain a second image of the target area;
the second image is received.
6. The method of claim 5, wherein the first mode command comprises at least a start time of the on-board SAR, the detection target, and a first operating parameter for acquiring the first image, and wherein the first mode command is generated according to a user requirement.
7. The method of claim 5, wherein the second mode command includes at least coordinates of the target area, a second operating parameter required to optimize the target area, and wherein analyzing the first image to generate the second mode command includes:
searching the target area in the first image according to the user requirement;
judging whether the definition of the target area meets the requirements of a user;
if the definition of the target area does not meet the user requirement, acquiring the coordinates of the target area and optimizing a second working parameter required by the target area;
generating the second mode instruction.
8. An airborne SAR, comprising:
the first instruction receiving module is used for receiving a first mode instruction sent by the ground controller;
the first image acquisition module is used for acquiring a first image of a detection target according to the first mode instruction;
the first image transmission module is used for downloading the first image to the ground controller, so that the ground controller analyzes the first image, generates a second mode instruction and sends the second mode instruction;
a second instruction receiving module, configured to receive the second mode instruction;
the second image acquisition module is used for performing real-time fine imaging or ISAR processing on a target area which is interested by a user in the first image according to the second mode instruction so as to obtain a second image of the target area;
and the second image transmission module is used for transmitting the second image to the ground controller.
9. The airborne SAR of claim 8, wherein the means further comprises:
and the image data compression module is used for performing data compression processing on the first image and the second image before the first image and the second image are downloaded to the ground controller.
10. A ground controller, comprising:
the first instruction sending module is used for sending a first mode instruction to an airborne SAR according to user requirements, so that the airborne SAR obtains a first image of a detection target according to the first mode instruction;
a first image receiving module for receiving the first image;
the first image analysis module is used for analyzing the first image and generating a second mode instruction;
a second instruction sending module, configured to send the second mode instruction to the airborne SAR, so that the airborne SAR performs real-time fine imaging or ISAR processing on a target area, which is interested by a user, in the first image according to the second mode instruction, so as to obtain a second image of the target area;
and the second image receiving module is used for receiving the second image.
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