阅读说明：本技术 一种视频卫星在轨实时探测系统及其视频传输方法 (Video satellite on-orbit real-time detection system and video transmission method thereof ) 是由 李志军 徐安宏 吴国福 郭春辉 范才智 袁福 吴军 王杰 于 2021-07-14 设计创作，主要内容包括：本申请涉及一种视频卫星在轨实时探测系统及其视频传输方法。系统包括：视频成像载荷分系统、在轨数据处理分系统和地面数据接收应用分系统；视频成像载荷分系统包括多台视频相机,用于实时获取目标区域的超大数据量视频图像；在轨数据处理分系统包括路由单元、数传发射装置和多个压缩单元,用于实时压缩获取的目标区域超大数据视频图像,以及路由、存储和发射所述压缩后的视频图像；多台视频相机与多个压缩单元对应连接；地面数据接收应用分系统设置于地面,包括数传接收装置、多个实时解压缩装置和多个视频显示装置,用于实时接收、实时解压缩和显示视频图像。本发明能够解决超大数据量视频卫星在轨成像探测数据的地面实时获取问题。(The application relates to an on-orbit real-time detection system of a video satellite and a video transmission method thereof. The system comprises: the system comprises a video imaging load subsystem, an on-orbit data processing subsystem and a ground data receiving application subsystem; the video imaging load subsystem comprises a plurality of video cameras and is used for acquiring super-large data volume video images of a target area in real time; the on-orbit data processing subsystem comprises a routing unit, a data transmission transmitting device and a plurality of compression units, and is used for compressing the acquired target area super-large data video image in real time and routing, storing and transmitting the compressed video image; the plurality of video cameras are correspondingly connected with the plurality of compression units; the ground data receiving application subsystem is arranged on the ground and comprises a data transmission receiving device, a plurality of real-time decompression devices and a plurality of video display devices and is used for receiving, decompressing and displaying video images in real time. The method can solve the problem of ground real-time acquisition of the in-orbit imaging detection data of the ultra-large data volume video satellite.)

1. A video satellite in-orbit real-time detection system, the system comprising:

the system comprises a video imaging load subsystem, an on-orbit data processing subsystem and a ground data receiving application subsystem;

the video imaging load subsystem is carried on the video satellite and comprises a plurality of video cameras and is used for acquiring super-large data volume video images of a target area in real time;

the on-orbit data processing subsystem is carried on the video satellite and comprises a plurality of compression units, a routing unit and a data transmission transmitting device, and is used for compressing acquired target area super-large data video images in real time to obtain compressed video images and routing, storing and transmitting the compressed video images;

the plurality of video cameras are correspondingly connected with the plurality of compression units;

the ground data receiving application subsystem is arranged on the ground and comprises a data transmission receiving device, a plurality of real-time decompression devices and a plurality of video display devices and is used for receiving, decompressing and displaying the video images in real time.

2. The system of claim 1, wherein the camera detector of the video camera is 12000 x 4996 pixels large area video imaging, the output video frame rate is 10fps, the data bit width is 8 bits, and the data output rate of each video camera is 4.8 Gbps.

3. The system of claim 1, wherein the compression unit is connected to the video camera using a four-way TLK2711 interface chip;

the compression unit adopts an XC7VX980T chip of Xilinx company as a main control FPGA chip with a compression function to realize the functions of interface control, video compression and data multiplexing; the setting range of the compression ratio of each compression unit is 10: 1-70: 1.

4. The system of claim 1, wherein the routing unit sends the data to be downloaded to the data transmission device through the TLK2711 interface;

the routing unit is communicated with the integrated information management single machine through a CAN bus;

the routing unit is respectively communicated with the compression unit at a high speed through an internal 4-pair FGPA high-speed GTX interface;

the routing unit adopts 20 MT29F256G08AUCABH3 chips, and realizes the data storage capacity of 5Tbits and the read-write speed of 5 Gbps.

5. The system of claim 1, wherein the data transmission means employs 1 number of transmitters and 1 set of phased array antennas;

the data transmission transmitter adopts XC7VX690T-1FFG1930I chips to realize the ground data transmission capability of 300 Mbps;

the phased array antenna adopts an A3PE3000L chip to realize the automatic staring and pointing capability to the ground station.

6. The system of claim 1, wherein the data transmission receiving device is configured to implement real-time receiving and demodulating of the compressed video image, and output the demodulated data using a gigabit network.

7. The system according to claim 1, wherein the real-time decompression device adopts a TX2 chip + FPGA architecture, the TX2 chip GPU implements a real-time decompression function on the compressed video image, and the decompressed video image is output through ten-gigabit optical fiber split screen.

8. The system according to claim 1, wherein the video display device adopts a3 x 2-way display split screen display mode to realize real-time display of 12000 x 4996 pixel large-area array video images, and the display refresh frame rate reaches 10 fps.

9. The system of claim 1, further comprising: a satellite platform;

the satellite platform comprises a housekeeping subsystem, a measurement and control subsystem and a power supply subsystem;

the satellite affair management subsystem is used for realizing the function of video satellite management;

the measurement and control subsystem is used for realizing remote measurement and control functions with ground measurement and control equipment;

the power supply subsystem is used for guaranteeing the power supply energy requirement of the equipment on the video satellite.

10. A video satellite on-orbit real-time detection video transmission method is characterized by comprising the following steps:

acquiring a super-large data volume video image of a target area through a video imaging load subsystem, and sending the video image to an on-orbit data processing subsystem; the on-orbit data processing subsystem comprises a compression unit, a routing unit and a data transmitting device;

compressing and transmitting the video image in real time through the on-orbit data processing subsystem;

and receiving, decompressing and displaying the video image in real time through the ground data receiving application subsystem.

Technical Field

The application relates to the technical field of video satellite image processing, in particular to an in-orbit real-time detection system of a video satellite and a video transmission method thereof.

Background

The optical remote sensing detection satellite with large area array, large data volume and video imaging has become one of the development trends of earth observation satellites in the future. The video data contains more information than a static single image, the dynamic attribute of the target can be obtained, so that the occurrence of a dynamic event is detected, the super-resolution reconstruction can be performed on the basis of the sequence image in the video image to obtain an image with higher resolution, and the method is very suitable for detecting a hot spot region. The video imaging data with higher resolution ratio is utilized to realize the rapid detection, identification and rapid interpretation of the dynamic target in the designated area, and the method has stronger application value.

The existing video satellite in China currently adopts a mode that video image data are acquired by orbit imaging and then are stored in on-satellite storage equipment, and the ground video data are acquired in a mode that the satellite passes the border and then is played back. The method is mature, reliable and high in safety, and is a common data acquisition mode for remote sensing satellites. The defects are as follows: when the data are acquired on the ground through the method, the real-time performance is not high, the delay of tens of minutes to several hours usually exists, and the video imaging data of a sensitive area cannot be acquired in real time. Meanwhile, in order to obtain a target video image with higher resolution and larger width, a system usually adopts a large-area array video detector, so that the obtained video image has both spatial resolution and time dimension expansion, the data volume is increased explosively, and huge burden is brought to data downloading.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a video satellite in-orbit real-time detection system and a video transmission method thereof, which can realize real-time and fast display of high-data-rate and high-resolution in-orbit imaging data.

A video satellite in-orbit real-time detection system, the system comprising:

the system comprises a video imaging load subsystem, an on-orbit data processing subsystem and a ground data receiving application subsystem;

the video imaging load subsystem is carried on the video satellite and comprises a plurality of video cameras and is used for acquiring super-large data volume video images of a target area in real time;

the on-orbit data processing subsystem is carried on the video satellite and comprises a plurality of compression units, a routing unit and a data transmission transmitting device, and is used for compressing acquired target area super-large data video images in real time to obtain compressed video images and routing, storing and transmitting the compressed video images;

the plurality of video cameras are correspondingly connected with the plurality of compression units;

the ground data receiving application subsystem is arranged on the ground and comprises a data transmission receiving device, a plurality of real-time decompression devices and a plurality of video display devices and is used for receiving, decompressing and displaying the video images in real time.

In one embodiment, the system further comprises: the camera detector of the video camera is 12000 multiplied by 4996 pixel large-area array video imaging, the output video frame rate is 10fps, the data bit width is 8bit, and the effective data output rate of each video camera is about 4.8 Gbps.

In one embodiment, the system further comprises: the compression unit is connected with the video camera by adopting four paths of TLK2711 interface chips;

the compression unit adopts an XC7VX980T chip of Xilinx company as a main control FPGA chip with a compression function to realize the functions of interface control, video compression and data multiplexing; the compression ratio of each compression unit can be set through parameter configuration, and the range is 10: 1-70: 1.

In one embodiment, the system further comprises: the routing unit sends data to be downloaded to a data transmission transmitting device through a TLK2711 interface;

the routing unit is communicated with the integrated information management single machine through a CAN bus;

the routing unit is respectively communicated with the compression unit at a high speed through an internal 4-pair FGPA high-speed GTX interface;

the routing unit adopts 20 MT29F256G08AUCABH3 chips, and realizes the data storage capacity of 5Tbits and the read-write speed of 5 Gbps.

In one embodiment, the system further comprises: the data transmission transmitting device adopts 1 number of transmission transmitters and 1 set of phased array antenna;

the data transmission transmitter adopts XC7VX690T-1FFG1930I chips to realize the ground data transmission capability of 300 Mbps;

the phased array antenna adopts an A3PE3000L chip to realize the automatic staring and pointing capability to the ground station.

In one embodiment, the system further comprises: the data transmission receiving device is used for realizing real-time receiving and demodulation of the compressed video image and outputting demodulated data by adopting a ten-gigabit network.

In one embodiment, the system further comprises: the real-time decompression device adopts a TX2 chip + FPGA architecture, the TX2 chip GPU realizes the real-time decompression function of the compressed video image, and the decompressed video image is output through ten-gigabit optical fiber split screens.

In one embodiment, the system further comprises: the video display device adopts a3 multiplied by 2 display split screen display mode to realize the real-time display of 12000 multiplied by 4996 pixel large area array video images, and the display refresh frame rate reaches 10 fps.

In one embodiment, the system further comprises: a satellite platform;

the satellite platform comprises a housekeeping subsystem, a measurement and control subsystem and a power supply subsystem;

the satellite affair management subsystem is used for realizing the function of video satellite management;

the measurement and control subsystem is used for realizing remote measurement and control functions with ground measurement and control equipment;

the power supply subsystem is used for guaranteeing the power supply energy requirement of the equipment on the video satellite.

A video satellite in-orbit real-time detection video transmission method, the method comprising:

acquiring a super-large data volume video image of a target area through a video imaging load subsystem, and sending the video image to an on-orbit data processing subsystem; the on-orbit data processing subsystem comprises a compression unit, a routing unit and a data transmitting device;

compressing and transmitting the video image in real time through the on-orbit data processing subsystem;

and receiving, decompressing and displaying the video image in real time through the ground data receiving application subsystem.

The video satellite in-orbit real-time detection system and the video transmission method thereof acquire the ultra-large data volume video image of a target area through the video imaging load subsystem and send the video image to the in-orbit data processing subsystem; the on-orbit data processing subsystem comprises a compression unit, a routing unit and a data transmitting device; real-time compression and transmission are carried out on the video image through the on-orbit data processing subsystem; and receiving, decompressing and displaying the video image in real time through a ground data receiving and applying subsystem. Aiming at the problems of poor real-time performance, low data rate and the like of the current video image data downloading of the video satellite, the invention realizes the problems of on-orbit real-time imaging, real-time data transmission, real-time acquisition on the ground and real-time display of video images with super large data volume by adopting methods of on-orbit real-time compression, real-time routing data downloading, real-time ground receiving, decompression, display and the like of the video image data, greatly improves the timeliness of acquiring data by users, provides a solution for the on-orbit real-time detection of the video satellite with super large data volume, and provides a new way for timely acquiring space-based remote sensing information.

Drawings

FIG. 1 is a schematic block diagram of a video satellite in-orbit real-time detection system in one embodiment;

fig. 2 is a flowchart illustrating a video satellite in-orbit real-time detection video transmission method according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

A real-time in-orbit detection system for video satellite comprises

The system comprises a video imaging load subsystem, an on-orbit data processing subsystem and a ground data receiving application subsystem;

the video imaging load subsystem is carried on a video satellite and comprises a plurality of video cameras and is used for acquiring super-large data volume video images of a target area in real time;

the on-orbit data processing subsystem is carried on a video satellite and comprises a plurality of compression units, a routing unit and a data transmission and transmitting device, wherein the compression units, the routing unit and the data transmission and transmitting device are used for compressing the obtained video images with ultra-large data volume in real time to obtain compressed video images and routing, storing and transmitting the compressed video images;

the plurality of video cameras are correspondingly connected with the plurality of compression units;

the ground data receiving application subsystem is arranged on the ground and comprises a data transmission receiving device, a plurality of real-time decompression devices and a plurality of video display devices and is used for receiving, decompressing and displaying video images in real time.

The video imaging load subsystem and the on-orbit data processing subsystem are payload equipment additionally arranged on the conventional satellite platform; the ground data receiving application subsystem is ground auxiliary equipment used in cooperation with a satellite.

FIG. 1 is a schematic block diagram of an in-orbit real-time detection system for a very large data volume video satellite in an embodiment, which includes a video imaging load subsystem, an in-orbit data processing subsystem, and a ground data receiving application subsystem. The satellite platform comprises a housekeeping subsystem, a measurement and control subsystem and a power supply subsystem, and is a system commonly equipped on the conventional satellite platform. The video imaging load subsystem, the on-orbit data processing subsystem and the ground data receiving application subsystem form a channel for satellite video data space-based real-time detection acquisition, real-time downloading, ground real-time receiving, decompression and display. The satellite management subsystem carried by the satellite platform is used for realizing all management functions of the whole satellite, comprises task planning, data management, satellite uplink and downlink data link management, time management, effective load management and the like, and can receive working parameters submitted by various satellite-borne equipment on the satellite through a data bus; the remote measurement and control function can be realized through the measurement and control subsystem and the ground measurement and control equipment.

The satellite platform is provided with a measurement and control subsystem which mainly comprises a satellite-borne measurement and control transponder and an antenna, and is mainly used for receiving a telemetering subcarrier signal submitted by a satellite affair management subsystem and downloading the telemetering subcarrier signal to the ground through the measurement and control transponder and the antenna; meanwhile, a wireless remote control instruction uploaded by ground measurement and control equipment is received through a measurement and control transponder and an antenna, converted into a remote control subcarrier signal and submitted to the housekeeping subsystem.

The power supply subsystem on the satellite platform is responsible for guaranteeing the power supply energy requirements of all equipment of the satellite. The power supply subsystem can provide 28V bus primary power supply for each device, and can also provide 3.3V-12V secondary power supply for the device according to the requirement.

The video imaging load subsystem includes 2 video cameras. The camera is a large-area-array, high-frame-rate and high-resolution visible light video camera self-developed by a user, and video images of a specified target area are obtained in real time in an on-track manner through a built-in CMOS sensor; and simultaneously, the video data processing and transmitting functions are internally provided. Each video camera is connected with a compression unit in the on-orbit data processing subsystem through 4 completely consistent channels, and each channel adopts a TLK2711 interface chip to transmit video data; an imaging unit and a thermal control lower computer of the video camera adopt a CAN data bus interface to realize communication with the housekeeping subsystem; the camera detector adopts GMAX1205 produced by long-photostudio core company, can realize 12000 multiplied by 4996 pixel large-area array video imaging, the output video frame rate is 10fps, the data bit width is 8bit, and the data output rate of each camera is about 4.8 Gbps. The 2 video cameras can be configured with lenses with different focal lengths according to task requirements, the ground video imaging detection with different resolutions is realized, and the total effective data rate can reach 9.6 Gbps.

The on-orbit data processing subsystem comprises 2 compression units, 1 routing unit and 1 set of data transmission transmitting device. Each compression unit correspondingly receives video image data of 1 video camera, performs real-time compression processing on the video image data, and then sends the compressed data to the routing unit; the routing unit carries out various routing processing on the compressed video data, can route the compressed video data to a data transmission sending device in real time, downloads the data to the ground in real time, and can store the data and play back the data when necessary; the data transmission transmitting device comprises a data transmission transmitter and a phased array antenna, data can be transmitted to the ground at the rate of 300Mbps, and the phased array antenna has the function of staring at a ground data transmission receiving station. The 2 compression units and the 1 routing unit are installed inside a case in a board card mode, and all units inside the case realize data interconnection through GTX interfaces.

Each compression unit is connected with a video camera by adopting four TLK2711 interface chips to realize the receiving of video data; an XC7VX980T chip of Xilinx company is used as a main control FPGA chip with a compression function, so that functions of interface control, video compression, data multiplexing and the like are realized; each compression unit can realize the video compression function of single-channel video camera 4.8Gbps video data, and the compression ratio can be set to 10: 1-70: 1.

The routing unit sends the data to be downloaded to the data transmission transmitting device through the TLK2711 interface; communicating with the integrated information management single machine through a CAN bus; the internal 4-pair FGPA high-speed GTX interface is adopted to respectively carry out high-speed communication with the 2 compression units; and the data storage capacity of 5Tbits in storage capacity and 5Gbps in reading and writing speed is realized by adopting 20 MT29F256G08AUCABH3 chips.

The data transmission transmitting device adopts 1 number of transmission transmitters and 1 set of phased array antenna. The data transmission transmitter adopts XC7VX690T-1FFG1930I chip to realize the ground data transmission capability of 300 Mbps; the phased array antenna adopts an A3PE3000L chip to realize the automatic gaze pointing capability on a ground station.

The ground data receiving application subsystem comprises 1 set of data transmission receiving device, 2 real-time decompression devices and 2 sets of video display devices. The data transmission receiving device adopts a satellite measurement and control station to realize real-time receiving and demodulation of the downloaded compressed video data, and adopts a gigabit network to output the demodulated data; each real-time decompression device adopts a TX2 chip + FPGA architecture, a GPU (graphics processing unit) of a TX2 chip realizes the real-time decompression function of a compressed video, and decompressed video images are output in a screen-splitting mode through ten-gigabit optical fibers; each set of video display device realizes the real-time display of 12000 multiplied by 4996 pixel large area array video images by adopting a3 multiplied by 2 path display split screen display mode, and the display refresh frame rate reaches 10 fps.

In one embodiment, the video satellite in-orbit real-time detection system has 2 operation modes:

the working mode 1 is a video camera imaging real-time download display mode: the output image data of each video camera is 12000 multiplied by 4996 multiplied by 8bit multiplied by 10fps, the data rate is 4.8Gbps, and the total data rate of 2 video cameras is 9.6 Gbps; each camera data is correspondingly and respectively connected with 1 compression unit, the compression units are compressed by adopting a compression ratio of 40:1, and the total effective data rate after compression is 240 Mbps; according to the compression multiplexing efficiency of 80%, the total data rate after 2-path video compression is not more than 300Mbps, and the requirement of the data transmission transmitting device on the ground data transmission rate of 300Mbps is met. The satellite housekeeping subsystem controls the video camera to image in real time by configuring parameters of each device, and sends video data to the compression unit to be compressed in real time, meanwhile, the routing unit sends the compressed video data to the data transmission device in real time and transmits the data to the ground through a wireless link, the ground data receiving application device receives the data transmitted in real time and decompresses and displays the data in real time, and the function of detecting the ground real-time imaging of 12000 multiplied by 4996 multiplied by 8 bits multiplied by 10fps multiplied by 2 paths of video image data and transmitting the data to the ground to be displayed in real time can be realized. Through testing, the total time consumption of the system from the imaging of the video camera to the image data acquisition to the ground decompression display is less than 800ms, and the in-orbit real-time detection of the video satellite with the ultra-large data volume is realized.

The operation mode 2 is a video image data playback display mode: the routing unit manages the stored compressed video data according to files, indexes corresponding data files according to instructions sent by the housekeeping subsystem, plays back the data files to the data transmission transmitting device according to the data rate of 300Mbps, and plays back the data to the ground and decompresses and displays the data.

According to the in-orbit real-time detection system of the super-large data volume video satellite, the real-time in-orbit detection and ground analysis display of the video data with the original data rate of 9.6Gbps can be realized, and the problem of ground real-time acquisition of in-orbit imaging detection data of the super-large data volume video satellite can be solved.

In one embodiment, as shown in fig. 2, there is provided a video satellite in-orbit real-time detection video transmission method, including the following steps:

step 202, acquiring a super-large data volume video image of a target area through a video imaging load subsystem, and sending the video image to an on-orbit data processing subsystem.

The on-orbit data processing subsystem comprises a compression unit, a routing unit and a data transmitting device.

And step 204, compressing and transmitting the video image in real time through the on-orbit data processing subsystem.

Step 206, receiving, decompressing and displaying the video image in real time through the ground data receiving application subsystem.

The video satellite in-orbit real-time detection system and the video transmission method thereof acquire the ultra-large data volume video image of a target area through the video imaging load subsystem and send the video image to the in-orbit data processing subsystem; the on-orbit data processing subsystem comprises a compression unit, a routing unit and a data transmitting device; real-time compression and transmission are carried out on the video image through the on-orbit data processing subsystem; and receiving, decompressing and displaying the video image in real time through a ground data receiving and applying subsystem. Aiming at the problems of poor real-time performance, low data rate and the like of the current video image data downloading of the video satellite, the invention realizes the problems of on-orbit real-time imaging, real-time data transmission, real-time acquisition on the ground and real-time display of video images with super large data volume by adopting methods of on-orbit real-time compression, real-time routing data downloading, real-time ground receiving, decompression, display and the like of the video image data, greatly improves the timeliness of acquiring data by users, provides a solution for the on-orbit real-time detection of the video satellite with super large data volume, and provides a new way for timely acquiring space-based remote sensing information.

It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.