CN109579795B - Large-format remote sensing image real-time processing system for satellite-borne camera - Google Patents

Abstract

The invention discloses a large-frame remote sensing image real-time processing system for a spaceborne camera. The system hardware comprises a data input/output module, a control module, a data processing module and a storage module. The control module is connected with the data input/output module and the data processing module respectively. The control module is mainly composed of a CPLD XC95288 and two dual-port SRAM (DPSRAM); the data input/output module includes two TLK2711 high-speed serial transceivers, which are connected with On-board camera data interface connection; the data processing module mainly includes 4 pieces of ADSP‑TS201 digital signal processor (DSP); the storage module includes a data buffer composed of two pieces of SDRAM and a program memory composed of a piece of non-volatile Flash. The invention can realize the real-time processing of the large-scale remote sensing images output by the on-board camera, and can provide support for the miniaturization and embedded practical engineering application of the on-board image processing system.

Description

Real-time processing system for large-format remote sensing images for spaceborne cameras

technical field

The invention relates to the technical field of spaceborne remote sensing image processing, and more particularly, to a large-format remote sensing image real-time processing system for a spaceborne camera.

Background technique

With the continuous progress of electronic science and technology and sensor science and technology, on-board high-speed/real-time processing of large-format remote sensing images has gradually become a research and development direction in the field of aerospace remote sensing. The current on-board processing tasks mainly focus on image preprocessing, massive data processing, target feature extraction, etc. Due to the limitation of the data transmission bandwidth between the satellite and the ground, large-format images generally need to perform 3:1-8 before returning to the ground. :1 compression ratio lossy compression, the ground decompressed image has a certain degree of distortion, and it is very difficult to restore the compressed distorted image.

With the significant improvement of the resolution of remote sensing images, the amount of obtained data is expanding rapidly. At the same time, the application scale and the number of users of remote sensing images are also increasing. Therefore, higher requirements are placed on the speed and effect of remote sensing image processing. The technical difficulties of onboard real-time processing of large-format remote sensing images are mainly reflected in the huge amount of uncompressed large-format remote sensing image data. Real-time processing requires not only optimized programs, but also hardware systems that can withstand the passage of huge data volumes.

Therefore, it is an urgent technical problem to be solved in the art to provide a large-format remote sensing image real-time processing system for a spaceborne camera, which can effectively process large-format remote sensing images in real time and at high speed.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a large-frame remote sensing image real-time processing system for a spaceborne camera, which solves the technical problem of real-time high-speed processing of large-frame remote sensing images.

In order to solve the above problems, the present invention provides a large-frame remote sensing image real-time processing system for a spaceborne camera, including: a data input/output module, a control module, a data processing module and a storage module;

The control module is respectively connected with the data input/output module and the data processing module, and the control module includes one piece of CPLD XC95288 and two pieces of DPSRAM, and the CPLD XC95288 is respectively connected with the read-write control of the two pieces of the DPSRAM. The logic signals are connected, and the two pieces of the DPSRAM are respectively the input end DPSRAM and the output end DPSRAM;

The CPLD XC95288 is used to send a write control signal to the input end DPSRAM, and the input end DPSRAM receives the to-be-processed image data after receiving the write control signal, and the CPLD XC95288 is also used to control the data processing The module reads the to-be-processed image data;

The CPLD XC95288 is further configured to send a write-out control signal to the output end DPSRAM, and the output end DPSRAM sends the processed image data to the data input/output module after receiving the write-out control signal;

The data input/output module includes two TLK2711 high-speed serial transceivers, and the two TLK2711 high-speed serial transceivers are respectively the input TLK2711 high-speed serial transceiver and the output TLK2711 high-speed serial transceiver;

The input terminal TLK2711 high-speed serial transceiver is connected with the input terminal DPSRAM, and is used for receiving digital image signals, converting the digital image signals from serial LVDS digital image signal format to parallel TTL digital image signal format, and Extracting valid data to generate the image data to be processed, and sending the image data to be processed to the input terminal DPSRAM;

The output terminal TLK2711 high-speed serial transceiver is connected to the output terminal DPSRAM for receiving the processed image data sent by the output terminal DPSRAM, and converting the processed image data into a parallel TTL digital image signal format. Convert to serial LVDS digital image signal and output;

The data processing module is connected to the control module and the storage module respectively, and is used for reading the image data to be processed, and processing the image data to be processed to obtain the processed image data, wherein ,

The data processing module includes 4 ADSP-TS201 DSPs, and a link port is used between each ADSP-TS201 DSP and the other 3 ADSP-TS201 DSPs to form a set of point-to-point full-connected data links to achieve 4 The two ADSP-TS201 DSPs are loosely coupled in pairs, while the four ADSP-TS201 DSPs are tightly coupled and interconnected by sharing a 32-bit external bus, and the four ADSP-TS201 DSPs are connected in a 32-bit external bus. The address range of bit uniform addressing has its own memory space and broadcast access shared memory space;

The storage module includes two pieces of SDRAM and one piece of Flash chip, wherein the SDRAM is an extended memory on the external bus of the 4 ADSP-TS201 DSPs, and the Flash chip is a program guide chip and a program guide chip in the processing system. External expansion memory.

Optionally, it also includes: a peripheral circuit module;

The peripheral circuit module includes a power supply module and a voltage monitoring module;

the data input/output module, the control module, the data processing module and the storage module are all connected to the power supply module;

The voltage monitoring module is respectively connected with the data input/output module, the control module, the data processing module and the storage module, and the voltage monitoring module is used to monitor the working voltage of each module in real time.

Optionally, the peripheral circuit module further includes a watchdog reset module, and the watchdog reset module is connected to the data processing module.

Optionally, the CPLD XC95288 is further configured to receive a control command and analyze and determine the control command. When it is determined that the control command is an image processing command, the CPLD XC95288 controls the input terminal DPSRAM to store the control command. The image data to be processed is sent to the data processing module; wherein,

The input end DPSRAM sends the to-be-processed image data to the respective link ports of the four ADSP-TS201 DSPs sequentially through the data bus.

Optionally, the CPLD XC95288 is further configured to receive a control command, and analyze and determine the control command. When it is determined that the control command is a pass-through mode command, the CPLD XC95288 controls the input terminal DPSRAM to execute image data. of straight in and straight out; of which,

The input end DPSRAM is connected with the output end TLK2711 high-speed serial transceiver, and the input end DPSRAM sends the to-be-processed image data to the output end TLK2711 high-speed serial transceiver;

The output terminal TLK2711 high-speed serial transceiver converts the to-be-processed image data from a parallel TTL digital image signal format to a serial LVDS digital image signal and outputs it.

Optionally, the output terminal DPSRAM is also used to receive the processed image data, and cache and merge the processed image data;

After combining the processed image data buffers, the output end DPSRAM sends the processed image data to the output end TLK2711 high-speed serial transceiver according to the control logic of the CPLD XC95288.

Optionally, the clock frequencies of the two SDRAMs are both greater than 80 MHz, the bit widths of the two SDRAMs are both 640 MBps, and the capacities of the two SDRAMs are both 512 Mbits.

Optionally, the bit width of the Flash chip is 8 bits, and the capacity is 8 Mbits.

Compared with the prior art, the large-frame remote sensing image real-time processing system for spaceborne cameras provided by the present invention at least achieves the following beneficial effects:

(1) The present invention adopts high-performance CPLD XC95288 to transmit image data to or receive image data from ADSP-TS201 through DPSRAM through data bus. The hardware implementation is simple and the reliability is high. It can provide a one-way data transmission speed of 500Mbytes/s, which fully meets the image data transmission requirements for real-time processing of large-format remote sensing images. And the 4 ADSP-TS201s are interconnected by link ports, and at the same time, they are interconnected through multi-processor buses, providing rich connection methods for the interaction of intermediate processing data.

(2) The present invention selects CPLD XC95288 and two DPSRAMs as the control modules of the system. CPLD XC95288 can construct digital integrated circuits with logic functions according to user requirements. It has flexible programming, high integration, short development cycle, wide application range, and manufacturing The cost is low, and it has good scalability for various remote sensing image real-time processing applications. CPLDXC95288 provides control signals, while DPSRAM is only used for data transmission. The structure of the control module is clear and highly changeable and controllable.

(3) The present invention uses TLK2711 as the receiver and transmitter in the data input/output module to convert between serial signals and parallel signals, instead of directly using the control module in the system to convert data signal formats. TLK2711 can provide a data throughput of up to 2.7Gbps, which can meet the image data input and output requirements of large-format remote sensing image real-time processing systems.

(4) The present invention combines the functions of image data input and output, format conversion, distribution and merging, and timing control into a data input/output module composed of a TLK2711 high-speed serial transceiver and a control module with CPLD as the processing control core In this paper, the miniaturized design of the hardware system is realized, which has significant promotion research and application significance.

Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

1 is a structural block diagram of a large-format remote sensing image real-time processing system for a spaceborne camera provided by Embodiment 1 of the present invention;

Fig. 2 is the working flow chart of the real-time processing system for large-format remote sensing images for spaceborne cameras provided by Embodiment 2 of the present invention;

FIG. 3 is a structural block diagram of a large-format remote sensing image real-time processing system for a spaceborne camera according to Embodiment 3 of the present invention.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

Example 1

The present invention provides a large-format remote sensing image real-time processing system for a spaceborne camera. FIG. 1 is a structural block diagram of a large-format remote sensing image real-time processing system for a spaceborne camera provided by Embodiment 1 of the present invention. As shown in Figure 1, the large-format remote sensing image real-time processing system for spaceborne cameras uses ADSP-TS201 floating-point high-speed DSP as the processing core to form a parallel processing system combining tight coupling and loose coupling. High-speed TLK2711 serial A line transceiver is used to link with the spaceborne camera, and combined with a dual-port SRAM (DPSRAM) buffer to realize the input and output of real-time data. It includes: a data input/output module 10 , a control module 20 , a data processing module 30 and a storage module 40 . Among them, DSP is Digital Signal Processing, digital signal processor.

The control module 20 is connected with the data input/output module 10 and the data processing module 30 respectively, the control module 20 includes a CPLD XC95288 and two DPSRAMs, and the CPLD XC95288 is respectively connected with the two DPSRAMs. The read and write control logic signals are connected. The two pieces of DPSRAM are the input DPSRAM and the output DPSRAM respectively. In the present invention, the high-performance complex programmable logic device CPLD XC95288 serves as the processing and control core of the system, and at the same time cooperates with two pieces of DPSRAM to form the control module of the system. The continuous wiring structure of CPLD XC95288 makes its timing delay uniform and predictable, enabling high-speed and real-time measurement and control. The control module mainly implements instruction decoding control, image data transmission, block and distribution control, image data output control, and the like.

The CPLD XC95288 is used to send a write control signal to the input end DPSRAM, the input end DPSRAM receives the image data to be processed after receiving the write control signal, and the CPLD XC95288 is also used to control the data processing The module reads the image data to be processed. Wherein, the CPLD XC95288 controls the digital image stream sent from the spaceborne camera through the input TLK2711 interface to enter the input DPSRAM, and after the DPSRAM is filled (or reaches the preset number), the DSP is started to read the input The image data in DPSRAM is processed.

The CPLD XC95288 is also used to send a write-out control signal to the output end DPSRAM, and after receiving the write-out control signal, the output end DPSRAM sends the processed image data to the data input/output module 10, That is, the output terminal DPSRAM is used as the data transmitter of the system to output the image data information processed by the system. After the data processing module completes the data processing, the CPLD XC95288 sends a data write control signal to the output terminal DPSRAM. After the DPSRAM is fully written (or reaches the preset number), the output terminal TLK2711 is started to write the processed image data. It is sent to the subsequent compression processing functional unit on the star.

The data input/output module 20 includes two TLK2711 high-speed serial transceivers. The two TLK2711 high-speed serial transceivers are respectively an input-end TLK2711 high-speed serial transceiver and an output-end TLK2711 high-speed serial transceiver. As a high-speed transmission link interface chip, TLK2711 high-speed serial transceiver has a data bit width of 16bit and a reference clock frequency range of 80MHz to 135MHz, so its output data rate can reach 1.6 to 2.7Gbps, which can meet the needs of large-format remote sensing images. data input and output requirements.

The input terminal TLK2711 high-speed serial transceiver is connected with the input terminal DPSRAM, and is used for receiving digital image signals, converting the digital image signals from serial LVDS digital image signal format to parallel TTL digital image signal format, and Extracting valid data to generate the to-be-processed image data, and sending the to-be-processed image data to the input end DPSRAM. The input terminal TLK2711 high-speed serial transceiver is used as a data receiver of the system, and the output interface of the input terminal TLK2711 high-speed serial transceiver is connected with the data input interface of the input terminal DPSRAM.

The output terminal TLK2711 high-speed serial transceiver is connected to the output terminal DPSRAM for receiving the processed image data sent by the output terminal DPSRAM, and converting the processed image data into a parallel TTL digital image signal format. Convert to serial LVDS digital image signal and output. The output terminal TLK2711 high-speed serial transceiver is used as a system data transmitter. The data input interface of the output end DPSRAM is connected to the data bus, and the data output interface of the output end DPSRAM is connected to the input interface of the output end TLK2711 high-speed serial transceiver.

The data processing module 30 is connected to the control module 20 and the storage module 40 respectively, and is used for receiving the image data to be processed, and processing the image data to be processed to obtain the processed image data. ,in,

The data processing module 30 includes 4 ADSP-TS201 DSPs, and each of the ADSP-TS201 DSPs and the other 3 ADSP-TS201 DSPs uses a link port to form a set of point-to-point full-connected data chains to achieve The loosely coupled connection between the four ADSP-TS201 DSPs can provide 500Mbytes/s per port and one direction. At the same time, the four ADSP-TS201 DSPs share a 32-bit external bus to achieve tight coupling and interconnection; the four ADSP-TS201 DSPs have their own memory space and broadcast access within a 32-bit unified address range. the shared memory space; the data processing module 30 provided by the present invention can exchange part of the intermediate data of image processing in various ways.

The interaction between the CPLD XC95288 and the data processing module includes: the CPLD XC95288 perceives the FLAG state of the DSP (if the DSP is idle) → generates IRQ → DSP receives data → FLAG port line changes → cancels IRQ → CPLD controls the DPRAM end The address returns to 0 → ready for the next visit. It should be noted that FLAG in the attached drawing only represents the position of the mark, that is, communication between the CPLD XC95288 and the DSP can be realized. IRQ in the figure represents the interrupt request, that is, the CPLD XC95288 can make the DSP receive or stop receiving data by generating or canceling the interrupt.

That is, the CPLD XC95288 judges the working state of the DSP through communication with the DSP. When the DSP is in an idle state, the CPLD XC95288 can control the input terminal DPSRAM to send the image data to be processed to the DSP.

In the present invention, ADSP-TS201DSP is used as the image processing core, which is suitable for signal processing or image processing with large storage capacity, high performance and high speed. Each ADSP-TS201 DSP has four sets of link ports. One set of link ports is used to receive and send image data, and the other two sets of link ports are used to exchange the intermediate data of image processing with the other two ADSP-TS201 DSPs. The group link port can be connected with other application extensions of the system. The four ADSP-TS201DSPs shown in Figure 1 are DSP1, DSP2, DSP3 and DSP4 respectively. Each ADSP-TS201DSP shows three groups of link ports L1, L2 and L3. The fourth group of link ports is shown in the structure diagram. not marked in.

The storage module 40 includes two pieces of SDRAM and one piece of Flash chip, wherein the SDRAM is an extended memory on the external bus of the four ADSP-TS201 DSPs, and the Flash chip is a program boot chip in the system, and provides External expansion memory function. The internal DRAM of ADSP-TS201 DSP is only 24Mbit, and it does not integrate on-chip ROM, so it needs to expand its external memory for storing application programs and data. In the present invention, one SDRAM may be shared by two ADSP-TS201 DSPs respectively. Optionally, the clock frequency of the SDRAM is greater than 80MHz. ADSP-TS201 DSP has an on-chip integrated SDRAM controller, which can provide all control signals for accessing SDRAM, and the external data bus of ADSP-TS201 is 64bit, which can be connected to two pieces of 32bit SDRAM, making the data storage rate of SDRAM up to 640MBps , the storage capacity reaches 512Mbits. A Flash chip can not only be used as a program boot chip, but also as an external memory. Optionally, the bit width of the Flash chip is 8 bits, and the capacity is 8 Mbits.

The large-frame remote sensing image real-time processing system for spaceborne cameras provided by the present invention can divide the large-frame remote sensing images into blocks and disperse processing by 4 ADSP-TS201 DSPs respectively, and use links between the 4 ADSP-TS201 DSPs. At the same time, the whole system has the characteristics of loose coupling and tight coupling. Four ADSP-TS201 DSPs can share intermediate processing data, and then combine the processing results of each digital processor and output them. It can reduce the difficulty of data flow control, maintain good scalability of the system, and realize real-time processing of large-format remote sensing images. The present invention uses a data input/output module composed of TLK2711 high-speed serial transceivers, and uses high-performance CPLD XC95288 as the control core of the system to realize the functions of image data input/output format conversion, data distribution and merging, and timing control. The miniaturized design of the image processing system is conducive to the practical engineering application of real-time high-speed processing of large-scale remote sensing images onboard. In addition, if the CPLD XC95288 and DPSRAM are directly used for the deserialization operation, it will consume a lot of internal resources, but in the present invention, the TLK2711 high-speed serial transceiver is used to realize the conversion between data signals, which is conducive to saving the internal resources of the control module and improving the The operating speed of the system.

Example 2

Embodiment 2 of the present invention provides a large-format remote sensing image real-time processing system for a spaceborne camera. FIG. 2 is a working flowchart of the large-format remote sensing image real-time processing system for a spaceborne camera provided by Embodiment 2 of the present invention. as shown in picture 2,

First, the receiving end of the input end TLK2711 high-speed serial transceiver in the data input/output module 20 receives the image digital signal sent by the remote sensing image acquisition system (ie, the spaceborne camera), wherein the image digital signal is usually 4 channels of serial LVDS digital image signals, the input terminal TLK2711 high-speed serial transceiver converts the 4 channels of serial LVDS digital image signals into 20 channels of parallel TTL digital image signals, and then takes the high 10-bit valid data to obtain the image data to be processed, The to-be-processed image data is sent to the input terminal DPSRAM.

Then, the CPLD XC95288 receives control commands (issued by the system user), and analyzes and determines the control commands.

When it is determined that the control command is an image processing mode command, the CPLD XC95288 controls the input end DPSRAM to send the image data to be processed to the data processing module 30, and sends the four ADSP-TS201 DSPs to each of the four ADSP-TS201 DSPs through the data bus. The link interface sends the to-be-processed image data in sequence. Data transmission adopts double data rate LVDS signal transmission. The 4 ADSP-TS201 DSPs process image data separately, and at the same time, the 4 ADSP-TS201 DSPs also exchange data. After completing the image processing of the image block, the double data rate LVDS signal format link port is still used to transmit back to the data bus. The processing result is sent to the output terminal DPSRAM, and the output terminal DPSRAM outputs the processing result of the system after format conversion of the processed image data.

Optionally, the output terminal DPSRAM is also used to receive the processed image data, and to cache and merge the processed image data; according to the control logic of the CPLD XC95288, the processed image data is sent to The output terminal is TLK2711 high-speed serial transceiver.

When it is determined that the control command is a pass-through mode command, the CPLD XC95288 controls the input DPSRAM to perform direct input and output of image data; at this time, the access enable signal of the input DPSRAM is enabled by the CPLDXC95288. The input DPSRAM is connected to the output TLK2711 high-speed serial transceiver, and the input DPSRAM sends the to-be-processed image data to the output TLK2711 high-speed serial transceiver; the output TLK2711 high-speed The serial transceiver converts the to-be-processed image data from 20-channel parallel TTL digital image signal format to 4-channel serial LVDS digital image signal and outputs it.

Example 3

Embodiment 3 of the present invention provides a large-format remote sensing image real-time processing system for a spaceborne camera. FIG. 3 is a structural block diagram of a large-format remote sensing image real-time processing system for a spaceborne camera provided by Embodiment 3 of the present invention. As shown in FIG. 3 , the large-format remote sensing image real-time processing system includes: a data input/output module 10, a control module 20, a data processing module 30, a storage module 40 and a peripheral circuit module 50;

The peripheral circuit module 50 includes a power supply module 501 and a voltage monitoring module 502;

The data input/output module 10 , the control module 20 , the data processing module 30 and the storage module 40 are all connected to the power supply module 501 . The power supply module 501 includes a PTH05010W power module to provide 1.2V voltage and an output current of up to 15A, and a PTH05000 power module to provide 2.5V, 1.6V, 3.3V voltage and an output current of up to 6A. The power consumption of the whole system mainly comes from 4 ADSP-TS201 DSPs. Considering the maximum power consumption and maximum current demand when the system is in the worst state, combined with the voltage requirements of each module, only two power modules are selected to supply power to the system, which can fully meet the power supply requirements of the system.

The voltage monitoring module is respectively connected with the data input/output module 10, the control module 20, the data processing module 30 and the storage module 40, and the voltage monitoring module 502 is used to monitor the voltage of each module in real time. Operating Voltage. The voltage monitoring module in the present invention is used to ensure that the system enters a normal working state, and at the same time, it plays a protective role when the system is abnormal. The module is mainly based on a MAX708 chip, and has the function of monitoring the working voltage of the data processing module 30 and the system voltage. .

The peripheral circuit module 50 further includes a watchdog reset module 503 , and the watchdog reset module 503 is connected to the data processing module 30 . Optionally, the watchdog in this module can choose ADM706R, which can not only complete the watchdog task, but also provide a good reset signal for the data processing module 30 driven by an external signal. A FLAG pin of ADSP-TS201 can be used as a dog feeding signal of the watchdog, and a button can be set in the system as a start signal input switch of the data processing module 30 .

It can be seen from the above embodiments that the real-time processing system for large-format remote sensing images for spaceborne cameras provided by the present invention at least achieves the following beneficial effects:

(1) The present invention adopts high-performance CPLD XC95288 to transmit image data to or receive image data from ADSP-TS201 through data bus through DPSRAM. The hardware implementation is simple and the reliability is high. The single link port of 4 ADSP-TS201 DSPs It can provide a one-way 500Mbytes/s data transmission speed, which fully meets the image data transmission requirements for real-time processing of large-format remote sensing images. And the 4 ADSP-TS201s are interconnected by link ports, and at the same time, they are interconnected through multi-processor buses, providing rich connection methods for the interaction of intermediate processing data.

(2) The present invention selects CPLD XC95288 and two DPSRAMs as the control modules of the system. CPLD XC95288 can construct digital integrated circuits with logic functions according to user requirements. It has flexible programming, high integration, short development cycle, wide application range, and manufacturing The cost is low, and it has good scalability for various remote sensing image real-time processing applications. CPLDXC95288 provides control signals, while DPSRAM is only used for data transmission. The structure of the control module is clear and highly changeable and controllable.

(3) The present invention uses TLK2711 as the receiver and transmitter in the data input/output module to convert between serial signals and parallel signals, instead of directly using the control module in the system to convert data signal formats. TLK2711 can provide a data throughput of up to 2.7Gbps, which can meet the image data input and output requirements of large-format remote sensing image real-time processing systems.

(4) The present invention combines the functions of image data input and output, format conversion, distribution and merging, and timing control into a data input/output module composed of a TLK2711 high-speed serial transceiver and a control module with CPLD as the processing control core In this paper, the miniaturized design of the hardware system is realized, which has significant promotion research and application significance.

Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are provided for illustration only and not for the purpose of limiting the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (8)

1. a large-format remote sensing image real-time processing system for spaceborne camera, is characterized in that, comprises: data input/output module, control module, data processing module and storage module; The control module is respectively connected with the data input/output module and the data processing module, and the control module includes one piece of CPLD XC95288 and two pieces of DPSRAM, and the CPLD XC95288 is respectively connected with the read-write control of the two pieces of the DPSRAM. The logic signals are connected, and the two pieces of the DPSRAM are respectively the input end DPSRAM and the output end DPSRAM; The CPLD XC95288 is used to send a write control signal to the input end DPSRAM, and the input end DPSRAM receives the to-be-processed image data after receiving the write control signal, and the CPLD XC95288 is also used to control the data processing The module reads the to-be-processed image data; The CPLD XC95288 is further configured to send a write-out control signal to the output end DPSRAM, and the output end DPSRAM sends the processed image data to the data input/output module after receiving the write-out control signal; The data input/output module includes two TLK2711 high-speed serial transceivers, and the two TLK2711 high-speed serial transceivers are respectively the input TLK2711 high-speed serial transceiver and the output TLK2711 high-speed serial transceiver; The input terminal TLK2711 high-speed serial transceiver is connected with the input terminal DPSRAM, and is used for receiving digital image signals, converting the digital image signals from serial LVDS digital image signal format to parallel TTL digital image signal format, and Extracting valid data to generate the image data to be processed, and sending the image data to be processed to the input terminal DPSRAM; The output terminal TLK2711 high-speed serial transceiver is connected to the output terminal DPSRAM for receiving the processed image data sent by the output terminal DPSRAM, and converting the processed image data into a parallel TTL digital image signal format. Convert to serial LVDS digital image signal and output; The data processing module is connected to the control module and the storage module respectively, and is used for reading the image data to be processed, and processing the image data to be processed to obtain the processed image data, wherein , The data processing module includes 4 ADSP-TS201 DSPs, and a link port is used between each ADSP-TS201 DSP and the other 3 ADSP-TS201 DSPs to form a set of point-to-point full-connected data links to achieve 4 The two ADSP-TS201 DSPs are loosely coupled in pairs, while the four ADSP-TS201 DSPs are tightly coupled and interconnected by sharing a 32-bit external bus, and the four ADSP-TS201 DSPs are connected in a 32-bit external bus. The address range of bit uniform addressing has its own memory space and broadcast access shared memory space; The storage module includes two pieces of SDRAM and one piece of Flash chip, wherein, the SDRAM is an extended memory on the external bus of the four ADSP-TS201 DSPs, and the Flash chip is a program guide chip and a program guide chip in the processing system. External expansion memory. 2. The large-format remote sensing image real-time processing system for on-board camera according to claim 1, is characterized in that, also comprises: peripheral circuit module; The peripheral circuit module includes a power supply module and a voltage monitoring module; the data input/output module, the control module, the data processing module and the storage module are all connected to the power supply module; The voltage monitoring module is respectively connected with the data input/output module, the control module, the data processing module and the storage module, and the voltage monitoring module is used to monitor the working voltage of each module in real time. 3. the large-format remote sensing image real-time processing system for spaceborne camera according to claim 2, is characterized in that, The peripheral circuit module further includes a watchdog reset module, and the watchdog reset module is connected with the data processing module. 4. the large-format remote sensing image real-time processing system for spaceborne camera according to claim 1, is characterized in that, The CPLD XC95288 is also used to receive a control command and analyze and determine the control command. When it is determined that the control command is an image processing command, the CPLD XC95288 controls the input DPSRAM to process the image data to be processed. sent to the data processing module; wherein, The input end DPSRAM sends the to-be-processed image data to the respective link ports of the four ADSP-TS201 DSPs sequentially through the data bus. 5. The large-format remote sensing image real-time processing system for spaceborne camera according to claim 1, is characterized in that, The CPLD XC95288 is also used to receive a control command, and analyze and determine the control command. When it is determined that the control command is a pass-through mode command, the CPLD XC95288 controls the input end DPSRAM to execute the straight-in and straight-out of the image data. ;in, The input end DPSRAM is connected with the output end TLK2711 high-speed serial transceiver, and the input end DPSRAM sends the to-be-processed image data to the output end TLK2711 high-speed serial transceiver; The output terminal TLK2711 high-speed serial transceiver converts the to-be-processed image data from a parallel TTL digital image signal format to a serial LVDS digital image signal and outputs it. 6. The large-format remote sensing image real-time processing system for spaceborne camera according to claim 1, is characterized in that, The output terminal DPSRAM is also used to receive the processed image data, and to cache and merge the processed image data; After combining the processed image data buffers, the output end DPSRAM sends the processed image data to the output end TLK2711 high-speed serial transceiver according to the control logic of the CPLD XC95288. 7. The large-format remote sensing image real-time processing system for on-board camera according to claim 1, is characterized in that, The clock frequencies of the two SDRAMs are both greater than 80 MHz, the bit widths of the two SDRAMs are both 32 bits, and the capacities of the two SDRAMs are both 512 Mbits. 8. The large-format remote sensing image real-time processing system for on-board camera according to claim 1, is characterized in that, The bit width of the Flash chip is 8 bits, and the capacity is 8 Mbits.

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