CN110795146A - Medium and low orbit satellite in-orbit software reconstruction method based on ground software real-time control - Google Patents
Medium and low orbit satellite in-orbit software reconstruction method based on ground software real-time control Download PDFInfo
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Abstract
The invention discloses a method for reconstructing in-orbit software of a medium and low orbit satellite based on real-time control of ground software, and relates to the field of software defined satellite load processing. The system consists of a ground side reconstruction control unit and a satellite side reconstruction processing unit, wherein the ground side reconstruction control unit realizes dynamic simulation and real-time monitoring of an actual storage area of the satellite side reconstruction processing unit by taking a sector as a basic unit, meets the reconstruction requirements of medium and low orbit satellite breakpoints and outage, and realizes the segmented multi-orbit transmission of large files; and the satellite side reconstruction processing unit realizes the read-write operation of the target file on the actual storage area. The method is particularly suitable for in-orbit software reconstruction of the medium and low orbit satellite system, and realizes the function software definition of the medium and low orbit satellite.
Description
Technical Field
The invention relates to a method for reconstructing in-orbit software of a medium and low orbit satellite based on real-time control of ground software, belonging to the field of on-satellite processing of satellite communication systems.
Background
In recent years, with the rapid development of satellite communication, the medium and low earth orbit satellite receives more and more attention from people due to its low cost, rapidness and flexibility, but the medium and low earth orbit satellite has limited satellite resources due to short transit time, and cannot meet the reconstruction requirements of breakpoints and power failure of large target files. The patent uses the design idea of defining a satellite network by software for reference, realizes a more complex reconstruction check algorithm by ground reconstruction control software, takes the sector of an on-satellite actual memory as a basic unit, simulates and monitors the on-satellite reconstruction state in real time, and meets the transmission requirements of medium and low orbit satellite breakpoints and power failure.
Disclosure of Invention
The invention aims to provide a method for reconstructing in-orbit software of a medium and low orbit satellite based on real-time control of ground software, which avoids the defects in the prior art. Meanwhile, the ground reconstruction control software takes the sector as a basic unit to realize real-time monitoring on the satellite reconstruction result and the reconstruction state.
The technical scheme adopted by the invention is as follows:
a method for reconstructing in-orbit software of a medium and low orbit satellite based on real-time control of ground software comprises the following steps:
(1) the ground side reconstruction control software selects the model consistent with the satellite side reconstruction processing unit;
(2) and the ground side reconstruction control software simulates and displays the actual storage area of the satellite side reconstruction processing unit in the simulated display area of the satellite-mounted memory of the ground side reconstruction control software. At the moment, all sectors of the actual storage area of the satellite-side reconstruction processing unit displayed in the analog display area of the on-board memory of the ground-side reconstruction control software are in a sector non-reconstruction state;
(3) the ground side reconstruction control software loads a target file and simulates cache according to the storage state of the target file in the actual storage area of the satellite side reconstruction processing unit by taking a sector as a basic unit; the method comprises the following steps that a simulation display area of a satellite memory of ground-side reconstruction control software marks a sector to be actually reconstructed of a satellite-side reconstruction processing unit memory as a sector to-be-reconstructed state;
(4) the ground side reconstruction control software adopts ping-pong operation to sequentially upload the cached target files of the sectors in the sector to-be-reconstructed state or the sectors in the sector reconstruction error state to the satellite side reconstruction processing unit in a plurality of data frames, wherein the first data frame of each sector target file is provided with a sector erasure mark;
(5) after receiving the data frames of the target file, the satellite-side reconstruction processing unit respectively caches the data frames and erases the corresponding sectors according to the identifier of the first data frame of the target file;
(6) after the sector is erased, the satellite side reconstruction processing unit writes a single sector target file uploaded by the ground side reconstruction control software into a corresponding sector, immediately reads the target file of the same sector and issues the target file to the ground side reconstruction control software;
(7) the ground side reconstruction control software compares and verifies a single sector target file issued by the satellite side reconstruction processing unit; if the comparison and verification results are completely the same, displaying the corresponding sector position of the analog display area of the on-board memory of the ground reconstruction control software as a sector reconstruction correct state; if the comparison results are not completely the same, or the ground side reconstruction control software does not receive the target file issued by the satellite side reconstruction processing unit within the specified time, or the ground side reconstruction control software only receives part of the target file issued by the satellite side reconstruction processing unit within the specified time, displaying the corresponding sector position of the analog display area of the on-board memory of the ground side reconstruction control software as a sector reconstruction error state, and returning to the step (4);
(8) after all sectors in the to-be-reconstructed state of the sectors in the simulation display area of the on-board memory of the ground side reconstruction control software are changed into a sector reconstruction correct state, the ground reconstruction control software requests an on-board reconstruction processing unit to issue all sector target files, the sector target files are sequentially compared with all sector target files cached by the ground reconstruction control software, and if the comparison results are completely the same, the reconstruction of the whole file is proved to be successful;
and finishing the whole reconstruction process.
Wherein, the step (7) specifically comprises the following steps:
(701) after receiving a single sector target file issued by a satellite side reconstruction processing unit, ground side reconstruction control software compares the single sector target file with the same sector target file cached by the ground side reconstruction control software;
(702) if the comparison results are completely the same, the sector reconstruction is successful, and the corresponding sector position of the analog display area of the on-board memory of the ground-side reconstruction control software is displayed as a sector reconstruction correct state; if the comparison result is different, the sector reconstruction fails, and the corresponding sector position of the analog display area of the on-board memory of the ground-side reconstruction control software is displayed as a sector reconstruction error state; if a certain sector in the simulation display area of the on-satellite memory of the ground reconstruction control software only receives part of the target files of the same sector sent by the satellite reconstruction processing unit within a specified time or does not receive the target files of the same sector sent by the satellite reconstruction processing unit, the sector reconstruction fails, and the position of the corresponding sector in the simulation display area of the on-satellite memory of the ground reconstruction control software is displayed as a sector reconstruction error state;
(703) and (4) judging whether a sector in a sector reconstruction error state exists in the simulation display area of the on-board memory of the ground reconstruction control software, if so, returning to the step (4), otherwise, executing the step (8).
Compared with the background technology, the invention has the following advantages:
1. the invention supports breakpoint and power-off reconstruction and meets the requirement of multi-track transmission of large files;
2. the method supports the real-time simulation of the ground-side reconstruction control software on the actual storage area of the satellite-side reconstruction processing unit, and realizes the real-time control on the on-satellite reconstruction state;
3. the method is particularly suitable for in-orbit software reconstruction of the medium and low orbit satellite, and realizes the function software definition of the medium and low orbit satellite;
4. the invention supports FPGA as the processing unit of the load equipment, and the on-board processing is simple.
Drawings
FIG. 1 is a star-to-earth reconfiguration protocol process flow diagram of the present invention.
Fig. 2 is a design diagram of the ground-side reconfiguration control software of the present invention.
Detailed Description
The invention will be further described with reference to fig. 1 and 2 and the following detailed description.
The invention discloses a method for reconstructing in-orbit software of a medium and low orbit satellite based on ground software real-time control, which comprises the following steps as shown in figure 1:
(1) the ground side reconstruction control software selects the model consistent with the satellite side reconstruction processing unit;
the ground side reconfiguration control software is a general ground software, and can support satellite storage models of various models, as shown in figure 2.
(2) And the ground side reconstruction control software simulates and displays the actual storage area of the satellite side reconstruction processing unit in the simulated display area of the satellite-mounted memory of the ground side reconstruction control software. At the moment, all sectors of the actual storage area of the satellite-side reconstruction processing unit displayed in the analog display area of the on-board memory of the ground-side reconstruction control software are in a sector non-reconstruction state;
(3) the ground side reconstruction control software loads a target file and simulates cache according to the storage state of the target file in the actual storage area of the satellite side reconstruction processing unit by taking a sector as a basic unit; the method comprises the following steps that a simulation display area of a satellite memory of ground-side reconstruction control software marks a sector to be actually reconstructed of a satellite-side reconstruction processing unit memory as a sector to-be-reconstructed state;
the operations of the ground side reconstruction control software such as the upper note, the comparison and the verification of the target file all take the sector as a basic unit.
(4) The ground side reconstruction control software adopts ping-pong operation to sequentially upload the cached target files of the sectors in the sector to-be-reconstructed state or the sectors in the sector reconstruction error state to the satellite side reconstruction processing unit in a plurality of data frames, wherein the first data frame of each sector target file is provided with a sector erasure mark;
and the satellite side reconstruction processing unit deletes each sector according to the first data frame identifier of the sector.
(5) After receiving the data frames of the target file, the satellite-side reconstruction processing unit respectively caches the data frames and erases the corresponding sectors according to the identifier of the first data frame of the target file;
the processing mode of the satellite-side reconstruction processing unit is the same no matter the sector target file uploaded in the state of the sector to be reconstructed in the analog display area of the memory on the satellite of the ground-side reconstruction control software or the sector target file uploaded in the error state of sector reconstruction.
(6) After the sector is erased, the satellite side reconstruction processing unit writes a single sector target file uploaded by the ground side reconstruction control software into a corresponding sector, immediately reads the target file of the same sector and issues the target file to the ground side reconstruction control software;
(7) the ground side reconstruction control software compares and verifies a single sector target file issued by the satellite side reconstruction processing unit;
(701) after receiving a single sector target file issued by a satellite side reconstruction processing unit, ground side reconstruction control software compares the single sector target file with the same sector target file cached by the ground side reconstruction control software;
(702) if the comparison results are completely the same, the sector reconstruction is successful, and the corresponding sector position of the analog display area of the on-board memory of the ground-side reconstruction control software is displayed as a sector reconstruction correct state; if the comparison result is different, the sector reconstruction fails, and the corresponding sector position of the analog display area of the on-board memory of the ground-side reconstruction control software is displayed as a sector reconstruction error state; if a certain sector in the simulation display area of the on-satellite memory of the ground reconstruction control software only receives part of the target files of the same sector sent by the satellite reconstruction processing unit within a specified time or does not receive the target files of the same sector sent by the satellite reconstruction processing unit, the sector reconstruction fails, and the position of the corresponding sector in the simulation display area of the on-satellite memory of the ground reconstruction control software is displayed as a sector reconstruction error state;
(703) judging whether a sector in a sector reconstruction error state exists in a simulation display area of a memory on the satellite of the ground side reconstruction control software, if so, returning to the step (4), otherwise, executing the step (8);
(8) after all sectors in the to-be-reconstructed state of the sectors in the simulation display area of the on-board memory of the ground side reconstruction control software are changed into a sector reconstruction correct state, the ground reconstruction control software requests an on-board reconstruction processing unit to issue all sector target files, the sector target files are sequentially compared with all sector target files cached by the ground reconstruction control software, and if the comparison results are completely the same, the reconstruction of the whole file is proved to be successful;
in order to further ensure the reconstruction correctness of the target file, a mode of verifying and comparing all the files again is adopted.
And through the 8 steps, the reconstruction of the whole target file is completed.
As shown in fig. 2, the analog display area of the satellite memory of the ground reconstruction control software of the present invention can realize real-time simulation of the reconstruction state of each sector of the actual memory of the satellite reconstruction processing unit, and perform reconstruction operations with the sector as a basic unit. The ground side reconfiguration control software has the following characteristics:
a ground-side reconstruction control software on-satellite memory simulation display area displays 4 different reconstruction states of each sector of a satellite-side reconstruction processing unit actual memory in a differentiated manner (the 4 different reconstruction states are a sector to-be-reconstructed state, a sector non-reconstructed state, a sector reconstruction correct state and a sector reconstruction error state respectively, and the 4 different simulation sector states can be displayed in the ground-side reconstruction control software on-satellite memory simulation display area in a differentiated manner through different colors);
for example: the actual memory of the target file to be reconstructed of the satellite-side reconstruction processing unit consists of 100 sectors, 100 simulation sectors are correspondingly displayed in the simulation display area of the memory on the satellite of the ground-side reconstruction control software, and the 100 simulation sectors are divided into 4 states (namely a sector to be reconstructed state, a sector not reconstructed state, a sector reconstruction correct state and a sector reconstruction error state respectively). Assuming that the target file needs to be reconstructed to the first 40 sectors of the actual memory corresponding to the satellite-side reconstruction processing unit, 4 state jumps of the sector simulated by the on-board memory simulation display area of the ground-side reconstruction control software are as follows:
① when the ground reconstruction control software only selects the type of the on-board memory and no target file is loaded, the 100 simulation sectors are all in a sector non-reconstruction state at the moment;
② when the ground reconstruction control software loads the target file, the front 40 simulation sectors of the satellite memory simulation display area of the ground reconstruction control software are in the state to be reconstructed at the moment, and the other simulation sectors are all displayed in the state that the sectors are not reconstructed;
③ if the comparison result between the sector 1 target file cached by the ground reconstruction control software and the sector 1 target file issued by the satellite reconstruction processing unit actual storage area is completely the same, the sector 1 in the ground reconstruction control software on-board memory simulation display area is displayed as the sector reconstruction correct state, and the rest sectors are analogized in turn;
④ if the comparison result between the sector 1 target file cached by the ground reconstruction control software and the sector 1 target file issued by the satellite reconstruction processing unit is not completely the same or the sector 1 in the analog display area of the on-board memory of the ground reconstruction control software does not receive the target file of the corresponding sector issued by the satellite reconstruction control software within the specified time or only receives part of the target file, then the sector 1 in the analog display area of the on-board memory of the ground reconstruction control software is displayed as a sector reconstruction error state, and the rest sectors are analogized in turn;
the ground side reconfiguration control software can be realized on a common PC, the satellite side processing unit can be realized on FPGA series products produced by Xilinx factories, and the satellite side storage equipment can adopt Flash memories of various models.
Claims (2)
1. A method for reconstructing in-orbit software of a medium and low orbit satellite based on real-time control of ground software is characterized by comprising the following steps of:
(1) the ground side reconstruction control software selects the model consistent with the satellite side reconstruction processing unit;
(2) the ground side reconstruction control software displays the actual storage area of the satellite side reconstruction processing unit in a simulated display area of a satellite-borne memory of the ground side reconstruction control software in a simulated manner, and at the moment, all sectors of the actual storage area of the satellite side reconstruction processing unit displayed in the simulated display area of the satellite-borne memory of the ground side reconstruction control software are in a sector non-reconstruction state;
(3) the ground side reconstruction control software loads a target file and simulates cache according to the storage state of the target file in the actual storage area of the satellite side reconstruction processing unit by taking a sector as a base unit; the method comprises the following steps that a simulation display area of a satellite memory of ground-side reconstruction control software marks a sector to be actually reconstructed of a satellite-side reconstruction processing unit memory as a sector to-be-reconstructed state;
(4) the ground side reconstruction control software adopts ping-pong operation to sequentially upload the cached target files of the sectors in the sector to-be-reconstructed state or the sectors in the sector reconstruction error state to the satellite side reconstruction processing unit in a plurality of data frames, wherein the first data frame of each sector target file is provided with a sector erasure mark;
(5) after receiving the data frames of the target file, the satellite-side reconstruction processing unit respectively caches the data frames and erases the corresponding sectors according to the identifier of the first data frame of the target file;
(6) after the sector is erased, the satellite side reconstruction processing unit writes a single sector target file uploaded by the ground side reconstruction control software into a corresponding sector, immediately reads the target file of the same sector and issues the target file to the ground side reconstruction control software;
(7) the ground side reconstruction control software compares and verifies a single sector target file issued by the satellite side reconstruction processing unit; if the comparison and verification results are completely the same, displaying the corresponding sector position of the analog display area of the on-board memory of the ground reconstruction control software as a sector reconstruction correct state; if the comparison results are not completely the same, or the ground side reconstruction control software does not receive the target file issued by the satellite side reconstruction processing unit within the specified time, or the ground side reconstruction control software only receives part of the target file issued by the satellite side reconstruction processing unit within the specified time, displaying the corresponding sector position of the analog display area of the on-board memory of the ground side reconstruction control software as a sector reconstruction error state, and returning to the step (4);
(8) after all sectors in the to-be-reconstructed state of the sectors in the simulation display area of the on-board memory of the ground side reconstruction control software are changed into a sector reconstruction correct state, the ground reconstruction control software requests an on-board reconstruction processing unit to issue all sector target files, the sector target files are sequentially compared with all sector target files cached by the ground reconstruction control software, and if the comparison results are completely the same, the reconstruction of the whole file is proved to be successful;
and finishing the whole reconstruction process.
2. The in-orbit software reconstruction method for the medium and low orbit satellite based on the ground software real-time control as claimed in claim 1, wherein: the step (7) specifically comprises the following steps:
(701) after receiving a single sector target file issued by a satellite side reconstruction processing unit, ground side reconstruction control software compares the single sector target file with the same sector target file cached by the ground side reconstruction control software;
(702) if the comparison results are completely the same, the sector reconstruction is successful, and the corresponding sector position of the analog display area of the on-board memory of the ground-side reconstruction control software is displayed as a sector reconstruction correct state; if the comparison result is different, the sector reconstruction fails, and the corresponding sector position of the analog display area of the on-board memory of the ground-side reconstruction control software is displayed as a sector reconstruction error state; if a certain sector in the simulation display area of the on-satellite memory of the ground reconstruction control software only receives part of the target files of the same sector sent by the satellite reconstruction processing unit within a specified time or does not receive the target files of the same sector sent by the satellite reconstruction processing unit, the sector reconstruction fails, and the position of the corresponding sector in the simulation display area of the on-satellite memory of the ground reconstruction control software is displayed as a sector reconstruction error state;
(703) and (4) judging whether a sector in a sector reconstruction error state exists in the simulation display area of the on-board memory of the ground reconstruction control software, if so, returning to the step (4), otherwise, executing the step (8).
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