CN110474673B - Dynamic on-orbit thermal updating method supporting breakpoint continuous transmission - Google Patents
Dynamic on-orbit thermal updating method supporting breakpoint continuous transmission Download PDFInfo
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- H04L9/3239—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using cryptographic hash functions involving non-keyed hash functions, e.g. modification detection codes [MDCs], MD5, SHA or RIPEMD
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Abstract
The invention discloses a dynamic on-orbit thermal updating method supporting breakpoint continuous transmission, which comprises the following basic steps of: the first step is as follows: remotely controlling the upstream injection patch data packet; the second step is as follows: checking the integrity and the validity of the data of the upper patch package; the third step: generating a new check file; the fourth step: generating an MD5 check value file corresponding to the on-track hot update patch package data file; the fifth step: modifying the newly generated on-track hot update patch package data file and the MD5 check value file name; a sixth step: and informing the corresponding process to restart or remap the function information in the hot updating patch package. The invention aims at the satellite-borne software system which is based on the operating system and runs in the virtual address space, can carry out dynamic hot update on the functions of the satellite-borne software module or a single function, and has great expandability and convenience.
Description
Technical Field
The invention relates to the technical field of satellite-borne embedded software, in particular to a dynamic on-orbit thermal updating method supporting breakpoint continuous transmission.
Background
With the function complication of the satellite-borne integrated electronic system, the satellite-borne system software mode developed by the traditional 'bare engine' becomes very popular, the development of the satellite-borne software by using a real-time embedded operating system is the trend of the satellite-borne integrated electronic system at present and in the future, and after the satellite-borne embedded operating system is used, numerous functional modules and complex program logic are brought, so that all functional modules cannot be completely covered when the satellite-borne system software is tested and verified on the ground, functional defects still exist after the satellite-borne system software is in orbit, the logic flow does not accord with the design intention and needs to be corrected, even the functions of some modules are not completely realized, and after the in-orbit data is complete, corresponding supplement and improvement are carried out, namely the satellite-borne system software needs to be expanded in-orbit.
After the satellite operates in orbit, when the satellite can not be verified by a ground experiment, the program in the storage device or the file system is directly replaced through the serial port or the network port, and the program is reloaded and executed. For an on-orbit satellite system, the ground can only change the behavior of the on-orbit satellite system through remote control uplink injection data, and an on-orbit programming method is characterized in that the on-orbit thermal updating and function upgrading maintenance of the software function of the satellite-borne system are realized through taking the remote control uplink injection data as the excitation of the on-orbit satellite system, so that the on-orbit service life and the reliability of the satellite are greatly improved.
The in-orbit programming technology is widely applied to the existing aerospace engineering, and in the prior art, the in-orbit programming implementation method comprises the following steps: 1. the method comprises the steps of performing lookup type replacement aiming at a set replacement function, namely specifying functions needing on-track programming before the last day of satellite-borne software, filling the functions into an on-track programming table, searching the table to determine whether on-track updating content exists or not when a program needs to access the corresponding functions, if so, using the on-track updating content, and otherwise, calling and executing the original content; 2. and modifying instruction jump on any address needing to be updated, and realizing modification of any statement. However, for the method 1, because the content of the on-track programming must be specified in advance, the flexibility of software implementation is reduced, the significance of the on-track programming is greatly reduced, and when the software defect occurs in an unspecified function sequence, the on-track programming cannot function; although the method 2 is flexible to implement and can modify and jump for any statement, the method is only available in a real address mode, and for application software running on an operating system in a virtual address, the operation of the method can cause failure of on-track hot update, so that the expected purpose cannot be achieved.
Disclosure of Invention
Aiming at the problem that the application software running on the real-time embedded operating system in the virtual address space can not jump randomly, the embodiment of the invention provides a dynamic on-track hot updating method supporting breakpoint continuous transmission by utilizing the dynamic loading characteristic provided by the embedded operating system so as to solve the problems that the existing on-track replacement of a set function module can only be carried out on the track, the application program running in the virtual address space can not realize random address jumping, the on-track programming data injected after the system is powered off can not be recovered and the like, thereby further improving the flexibility of software design of the satellite-borne system and the on-track upgradability and maintainability.
The embodiment of the invention provides a dynamic on-orbit thermal updating method supporting breakpoint continuous transmission, which comprises the following steps: the first step is as follows: the satellite-borne software receives all on-orbit hot updating patch packet data from the ground in a remote control uplink injection mode and sends the on-orbit hot updating patch packet data to an on-orbit hot updating module; the second step is as follows: after all the on-track hot update patch package data are received, performing MD5 verification on the on-track hot update patch package, and if the verification is correct, entering a third step; the third step: firstly, storing in-orbit hot update patch packet data injected in a remote control uplink manner in a memory, then generating a file in a main partition of a NorFlash file system, and writing the patch packet data in the memory into the file; the fourth step: generating MD5 check value files corresponding to a plurality of patch package files under the directory where the on-track hot updating patch package data files are located; the fifth step: respectively modifying the names of the newly generated on-track hot update patch package data file and the corresponding MD5 check value file into the names of the file needing to be hot updated and the corresponding MD5 check value file; a seventh step of: and according to the information in the on-track hot update patch package, sending a signal to the process to which the patch package belongs, informing the process to perform corresponding processing, and performing process reset or remapping operation on functions in the on-track hot update patch package.
Preferably, in the second step, if the verification is incorrect, the ground determines the lost patch packet data through remote measurement, and remotely injects the lost packet data upstream.
Preferably, after the fifth step, a sixth step is further included: according to the method from the third step to the fifth step, the file to be updated and the corresponding MD5 check value file, the on-track hot update patch package data file and the corresponding MD5 check value file are backed up to the same file system as the partition, and the file name is consistent with the name of the corresponding file in the main partition.
Preferably, after the seventh step, an eighth step is further included: and the ground judges whether the on-orbit thermal updating is successful according to the downlink remote measurement and the memory unloading function, and if the on-orbit thermal updating is unsuccessful, the ground can organize the remote control command with a corresponding format and return to the previous version or the initial safe version.
Preferably, the patch package data format is different from other remote control packages, including: the first MD5 check value, the hot update process ID, the hot update file number and the hot update data, wherein the first MD5 check value is obtained by ground calculation aiming at a newly generated file and is used for checking when complete patch package data is received on a satellite.
Preferably, the integrity check in the second step has two layers of checks, including: firstly, each packet of remote control data contains verification, which can be used for ensuring the integrity of the packet of remote control data; and secondly, performing MD5 value calculation on the received patch packet data stored in the memory to obtain a second MD5 check value, and comparing the second MD5 check value with a first MD5 check value generated on the ground to ensure the integrity of all patch packet data injected in the remote control uplink.
Preferably, the NorFlash is divided into two regions: a primary partition and a redundant partition.
Preferably, the fifth step further comprises: characters are added after the names of the file which needs to be updated at this time and the corresponding MD5 check value file respectively so as to keep the original file, and the original file can be used as the basis for version rollback after the hot update fails.
Preferably, the remote control packet format organized when reverting to the previous version or the initial secure version includes: a process ID of the rollback, a file number of the rollback.
Preferably, when the in-orbit hot update patch packet requiring remote control uplink injection is large, if the in-orbit hot update patch packet cannot be completed in the period of one-orbit or two-orbit satellite injection, the in-orbit hot update patch packet can be divided into multiple in-orbit hot update patch packets until all the patch packet data requiring in-orbit hot update are injected.
The embodiment of the invention can provide the on-orbit hot updating method for the operating system satellite-borne application software of the operating ground virtual address space, has positive reference significance for improving the on-orbit operation reliability and maintainability of the satellite-borne system software, and has better practical engineering application value in the aerospace field.
Drawings
FIG. 1 is a flowchart illustrating a dynamic on-track hot-update method supporting breakpoint resumption according to an embodiment of the present invention;
FIG. 2 is a functional structure diagram of a dynamic on-track hot-update method supporting breakpoint resumption according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a dynamic on-track hot update process supporting breakpoint resumption according to an embodiment of the present invention.
Detailed Description
The following provides a detailed technical solution of the embodiment of the present invention with reference to the accompanying drawings.
Referring to fig. 1-3, the method for dynamically programming an intelligent on-track thermal update according to the present invention includes the following steps:
first step S1: the satellite-borne software receives all on-orbit hot updating patch packet data from the ground in a remote control uplink injection mode and sends the patch packet data to an on-orbit hot updating module; before the on-orbit hot updating patch packet data is injected into the satellite-borne software in a remote control uplink mode, firstly, the ground semi-physical simulation platform verifies and completes the whole process of the on-orbit hot updating, and then the data is organized according to the on-orbit hot updating patch packet data format by the ground to carry out remote control uplink injection;
the on-orbit hot patch package from the ground is different from other remote control packages, is specially used for on-orbit hot updating and comprises a first MD5 check value, a hot updating process ID, a hot updating file number and hot updating data, wherein the first MD5 check value in the patch package is obtained by calculation of the ground aiming at a newly generated file and is used for checking when complete patch package data is received on the satellite.
Second step S2: after all the on-track hot update patch package data are received, performing MD5 verification on the on-track hot update patch package, and if the verification is correct, entering a third step S3; if the verification is incorrect, the patch packet data on the on-orbit hot updating is incomplete, the ground judges the lost patch packet data through remote measurement, and the lost data packet is injected in a remote control uplink mode;
here, MD5 checks have two layers of checks, including: firstly, each packet of remote control data contains verification, which can be used for ensuring the integrity of the packet of remote control data; and secondly, performing MD5 value calculation on the received patch packet data stored in the memory to obtain a second MD5 check value, and comparing the second MD5 check value with a first MD5 check value generated on the ground to ensure the integrity of all patch packet data injected in the remote control uplink.
Third step S3: firstly, storing in-orbit hot update patch packet data injected in a remote control uplink manner in a memory, then generating a file in a main partition of a NorFlash file system, and writing the patch packet data in the memory into the file; in this embodiment, the name of the file may be a name of a file that needs to be updated by hot, and then a character "0" or other characters may be added;
fourth step S4: generating MD5 check value files corresponding to a plurality of patch package files under the directory where the patch package files are located;
in the embodiment, after the patch file is generated, the 3 parts of the MD5 check value files corresponding to the patch file are generated, and when the patch file is operated, the consistency of the patch file can be checked by using the 3 parts of the check value files, so that the data in NorFlash is prevented from being modified due to single event upset, and the consistency of the file is further influenced.
Fifth step S5: respectively modifying the names of the newly generated patch package file and the corresponding MD5 check value file into the names of the file needing to be updated by heat and the corresponding MD5 check value file; meanwhile, characters are added after the names of the file which needs to be updated at the time and the corresponding MD5 check value file respectively so as to keep the original file, and the original file can be used as the basis for version rollback after the hot update fails;
sixth step S6: according to the method from the third step to the fifth step, files needing to be updated and the corresponding MD5 check value files, on-track hot update patch package data files and the corresponding MD5 check value files are backed up to the same file system as the partition, and the file names are consistent with the names of the corresponding files in the main partition;
here, the NorFlash is divided into two regions: the system comprises a main partition and a redundant partition, wherein the two partitions are two different physical areas, and all application program files, dynamic library files and important configuration files are stored in each partition to keep the reliability and the robustness of the system.
Seventh step S7: according to the information in the on-orbit hot updating patch package, sending a signal to the process to which the patch package belongs, informing the process to perform corresponding processing, and performing process resetting or remapping operation on functions in the patch package;
eighth step S8: and the ground judges whether the on-orbit thermal updating is successful according to the downlink remote measurement and the memory unloading function, and if the on-orbit thermal updating is unsuccessful, the ground can organize the remote control command with a corresponding format and return to the previous version or the initial safe version.
In this embodiment, the format of the remote control packet organized when the previous version or the initial security version is returned to includes: a process ID of the rollback, a file number of the rollback. And the on-track hot updating module updates the file names and the MD5 check value file names of the files corresponding to the process numbers in the main partition and the redundant partition according to the two pieces of information, deletes the currently used file and the corresponding MD5 check value file, sends a signal to the corresponding process, actively informs the process of finishing the rollback of the version, makes a specific action by the process, and performs process reset or remapping operation on functions in the patch package.
The method has the function of breakpoint continuous transmission, when the in-orbit hot update patch packet needing to be injected is large, the in-orbit hot update patch packet cannot be injected in the period of one orbit or two orbits of a satellite, the multi-orbit hot update can be divided into multiple orbits until all patch packet data needing to be subjected to in-orbit hot update are injected, and in the injecting process, if a plurality of packet data are lost due to a channel or a transmission reason, all data packets do not need to be injected again, the number of the lost packets is judged only according to downlink telemetering, and according to the information, only the lost packet needs to be injected, and one-time in-orbit hot update operation can be completed.
The design principle and the design idea of the embodiment of the invention mainly comprise the following three parts:
(1) by using the dynamic loading characteristic and the file system provided by the operating system, the modules which have the on-orbit hot update requirement, relatively independent functions and capability of decoupling are independently made into dynamic link library files or an independent application program, and then are linked into the main program or the main program is used for starting the independent application process. If the dynamic library file form is adopted, when the function in the dynamic library file is required to be called and executed, the function in the dynamic library file is respectively mapped to the process space (by using a standard interface provided by posix), and when the specific function is required to be called, the mapped pointer is called, so that the function in the dynamic library file is called and executed; if the data is compiled into a single application program, corresponding data interaction is completed by an interprocess communication means;
(2) when the on-track module needs to be updated hot, the newly generated dynamic library link library file needs to be suffixed with ". so" or an application program file generated independently, a standard remote control package is generated by using tool software without suffixes, the remote control package comprises a module index to be replaced, a process index to which the module belongs, and an MD5 code of the on-track hot update file at this time, the integrity of data verification and the reliability of on-track hot update are ensured by the information, and the packet data format content of the on-track hot update is noted as shown in table 1:
| means of | …… | Remote control packet sequence number | …… | File data |
| Number of bytes | …… | 2 (tundish) | …… | 247 |
TABLE 1
At a certain determined moment, a dynamic library file used in an application program or a started application program is determined, but the on-orbit hot update can be performed in an on-orbit hot updated dynamic library file or application program according to the function and task requirements, aiming at the dynamic library file or application program with function defects or function expansion upgrading, so that the robustness and reliability of the on-board software system are ensured. The MD5 check code in the remote control package of the upper note can ensure the integrity of the upper note file, when the check fails, the function repair and the function expansion of the current time can be abandoned, and the old version is still used, so that the satellite-borne software system can be prevented from system crash caused by wrong on-orbit hot update patch packages, and the satellite loses control. After the on-orbit hot update module is checked, a new module file is generated, and according to information provided in the on-orbit hot update module first package data file, a corresponding process is actively informed in a semaphore naming mode; after receiving the corresponding signal, the process maps the function in the new dynamic library file to the process space of the process according to the selected mode, or restarts the corresponding application program to start a new function;
(3) the module that completes the on-track hot update may be rolled back to the previous version or the initial safe version according to the remote command. When on-orbit hot update is carried out on a certain module, a newly injected on-orbit hot update patch package is regenerated into a file, and a mode of modifying the file name is utilized, so that not only is the newly injected patch package replaced by the currently used file name, but also the mode of modifying the original file into the existing file name and adding suffix is realized, the original version is reserved, the condition that the on-orbit hot update fails at this time due to abnormity can be ensured, a certain correct version can be returned, and controllability is realized. In addition, after the replacement is successful, if the system is started again after power failure, the patch package which is updated on the track newly is still used, but the previous version is not used continuously.
In summary, on one hand, the embodiment of the present invention can perform dynamic on-track hot update on a functional module or an application program of a satellite-borne embedded system that enables an MMU component and uses an operating system as a running platform, and has strong flexibility and self-maintainability; on the other hand, the version is supported to be returned to the version before the current on-track hot update, and the method has stronger expandability; moreover, function expansion or defect repair can be easily realized based on a dynamic library or an application program, and the method is not limited by the size of space, so that the maintainability of the satellite-borne software is greatly improved. Compared with the traditional on-orbit programming implementation mode of the satellite-borne software, the on-orbit programming method has the advantages of being easy to implement, reliable, flexible and the like, and has a strong engineering practice value.
The above description is only exemplary of the present invention, but the scope of the present invention is not limited thereto, and any modification, replacement, or improvement made by those skilled in the art within the spirit and principle of the present invention should be included in the protection scope of the claims described in the present invention.
Claims (6)
1. A dynamic on-orbit hot updating method supporting breakpoint continuous transmission is characterized by comprising the following steps:
the first step is as follows: the satellite-borne software receives all on-orbit hot updating patch packet data from the ground in a remote control uplink injection mode and sends the on-orbit hot updating patch packet data to an on-orbit hot updating module;
wherein, the patch package data format is different from other remote control packages, and comprises: the method comprises the steps that a first MD5 check value, a hot updating process ID, a hot updating file number and hot updating data are obtained, wherein the first MD5 check value is obtained by ground calculation aiming at a newly generated file and is used for checking when complete patch package data are received on a satellite;
the second step is as follows: after all on-orbit hot updating patch packet data are received, performing MD5 verification on the on-orbit hot updating patch packet, if the verification is incorrect, judging lost patch packet data through remote measurement on the ground, and remotely controlling uplink injection of lost data; if the verification is correct, entering a third step; wherein, the integrality check has two layers of checks, include: firstly, each packet of remote control data contains verification, which can be used for ensuring the integrity of the packet of remote control data; performing MD5 value calculation on the received patch packet data stored in the memory to obtain a second MD5 check value, and comparing the second MD5 check value with a first MD5 check value generated on the ground to ensure the integrity of all patch packet data injected in the remote control uplink;
the third step: firstly, storing in-orbit hot update patch packet data injected in a remote control uplink manner in a memory, then generating a file in a main partition of a NorFlash file system, and writing the patch packet data in the memory into the file;
the fourth step: generating MD5 check value files corresponding to a plurality of patch package files under the directory where the on-track hot update patch package data files are located, and checking the consistency of the patch files through a plurality of MD5 check files to prevent data in NorFlash from being modified due to single event upset;
the fifth step: respectively modifying the names of the newly generated on-track hot update patch package data file and the corresponding MD5 check value file into the names of the file needing to be hot updated and the corresponding MD5 check value file;
a sixth step: according to the method from the third step to the fifth step, files needing to be updated and corresponding MD5 check value files, on-track hot update patch package data files and corresponding MD5 check value files are backed up to a redundant partition of the file system, and the file names are consistent with the names of the corresponding files in the main partition;
a seventh step of: and according to the information in the on-track hot update patch package, sending a signal to the process to which the patch package belongs, informing the process to perform corresponding processing, and performing process reset or remapping operation on functions in the on-track hot update patch package.
2. The dynamic on-track hot-update method supporting breakpoint resume according to claim 1, further comprising, after the seventh step, an eighth step of: and the ground judges whether the on-orbit thermal updating is successful according to the downlink remote measurement and the memory unloading function, and if the on-orbit thermal updating is unsuccessful, the ground can organize the remote control command with a corresponding format and return to the previous version or the initial safe version.
3. The dynamic on-track hot-update method supporting breakpoint resume according to claim 1, wherein the NorFlash is divided into two regions: a primary partition and a redundant partition.
4. The dynamic on-track hot-update method supporting breakpoint resume according to claim 1, wherein in the fifth step, the method further comprises: characters are added after the names of the file which needs to be updated at this time and the corresponding MD5 check value file respectively so as to keep the original file, and the original file can be used as the basis for version rollback after the hot update fails.
5. The dynamic on-track hot-update method supporting breakpoint resume according to claim 2, wherein the remote control packet format organized when rolling back to the previous version or the initial secure version comprises: a process ID of the rollback, a file number of the rollback.
6. The method as claimed in claim 1, wherein when the in-orbit hot update patch packet to be remotely injected in uplink is large, if the in-orbit hot update patch packet cannot be injected in one or two orbit of the satellite, the method can be divided into multiple in-orbit hot update packets until all the patch packet data to be updated in-orbit hot are injected.
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