CN111367311B - Method for realizing backup measurement and control channel of spacecraft operation and control channel - Google Patents
Method for realizing backup measurement and control channel of spacecraft operation and control channel Download PDFInfo
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- CN111367311B CN111367311B CN202010098870.2A CN202010098870A CN111367311B CN 111367311 B CN111367311 B CN 111367311B CN 202010098870 A CN202010098870 A CN 202010098870A CN 111367311 B CN111367311 B CN 111367311B
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- 238000002347 injection Methods 0.000 description 2
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/10—Simultaneous control of position or course in three dimensions
- G05D1/101—Simultaneous control of position or course in three dimensions specially adapted for aircraft
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a method for realizing backup measurement and control channels of a spacecraft operation control channel, which specifically comprises information source identification, data distribution paths and safety control; the information source identification: searching a data source capable of bearing measurement and control uplink data in the operation and control uplink data; the data distribution path: finding a distribution path in the operation control uplink data processing module and the remote control uplink data processing module, and distributing the data of the operation control uplink channel to the measurement and control uplink data processing module when the operation control uplink processing is performed; the safety control: and safety control is carried out on the measurement and control uplink data. The method can achieve the purpose of backup of the uplink channel and enhance the safety of the satellite under the conditions that the existing hardware resources are not changed and the software is not powered down to restart.
Description
Technical Field
The invention belongs to the technical field of measurement and control communication of spacecrafts, and particularly relates to a method for realizing backup measurement and control channels of a spacecraft operation control channel.
Background
The spacecraft is generally composed of a platform and a load, wherein a measurement and control channel of the platform is generally used for distance measurement, telemetry and remote control information transmission of satellites; the uplink and downlink channels of the load are usually used for transmitting the load service data, and the uplink and downlink information of the load and the downlink information of the load are usually divided into clear steps, and no backup and intersection exists.
The remote control uplink data is uploaded through a measurement and control channel, and is indispensable to a ground control satellite; however, under the condition that failure risks exist in the measurement and control channels of the in-orbit satellites, how to add a backup function to the uplink channels, and whether the direct relation satellites can continue to work effectively; or under the condition of limited resources, how to add backup for an uplink channel under the condition of not adding hardware investment is related to satellite safety.
Based on the design of the navigation satellite constellation, at the beginning of the design, the navigation satellite constellation and the navigation satellite constellation have no backup relationship. However, after the satellite is transmitted into orbit, the backup function is lost under certain conditions of measuring and controlling the uplink channel, so that the satellite is restarted without power failure on the basis of not changing hardware resources. The purpose of backup measurement and control of the uplink channel of the operation control channel is achieved by selecting the existing information link of the operation control channel.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for realizing backup measurement and control channels of a spacecraft operation control channel, so that the satellite can achieve the purpose of backup of an uplink channel and enhance the safety of the satellite under the conditions that the existing hardware resources are not changed and the software is not powered down to restart.
The technical scheme of the invention is as follows:
the method specifically comprises information source identification, data distribution path and safety control;
the information source identification: searching a data source capable of bearing measurement and control uplink data in the operation and control uplink data;
the data distribution path: finding a distribution path in the operation control uplink data processing module and the remote control uplink data processing module, and distributing the data of the operation control uplink channel to the measurement and control uplink data processing module when the operation control uplink processing is performed;
the safety control: and safety control is carried out on the measurement and control uplink data.
Further, the operation control uplink data of the invention meets the following conditions:
(a) Scalable information source class code distance can be supported: the information source type code distance can distinguish the new uplink remote control data from the original service data;
(b) Has certain bearing capacity: the capacity Ly byte of the business data used for bearing the business, presume the information source identification code length is Lh byte, the maximum length of the remote control data is Lc byte; when the remote control data is not unpacked, ly > =lh+lc is satisfied, and if unpacked, 2Lx (Ly-Lx-Lh) > =lc should be satisfied assuming that the sequence field length is Lx;
(c) With a certain bandwidth margin: the selected original business data source is non-periodic uplink, and has a rich bandwidth allowance.
Further, the data distribution path selection according to the present invention should satisfy the following conditions:
(a) The method comprises the following steps of: if the two processing modules are located on different hardware devices, the two devices need to be provided with hardware links;
(b) The method comprises the following steps: the method has a corresponding application layer data transmission path or is maintained and opened through a software module.
Further, the invention provides a method for safely controlling measurement and control uplink data, which comprises the following steps of
(a) And (3) data verification: the method comprises checksum setting and length verification;
(b) Classification control of instructions: for dangerous forbidden instructions, the control channel is generally refused to be uplifted;
(c) Large ring comparison function: for dangerous forbidden instructions, the dangerous forbidden instructions are really forwarded, large-loop comparison is performed, after the ground is downloaded through uplink, the ground is confirmed, and after the confirmation instructions are sent, the data links are distributed.
Advantageous effects
Firstly, the invention realizes the reconstruction of software under the condition of not changing the existing hardware configuration, and realizes the purpose of backing up, measuring and controlling and remotely controlling the uplink channel of the operation control channel.
Secondly, the invention realizes the operation control backup measurement and control expectation through the actual in-orbit injection test verification, the instruction uplink is correct, and the original operation control uplink and downlink service logic is not affected.
Drawings
FIG. 1 is an uplink path distribution diagram;
FIG. 2 is a flow chart of the remote control uplink process of the operation control channel supporting the measurement and control channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
On the premise of constraint, the satellite-borne computer software of the navigation satellite has the capability of module maintenance, and meanwhile, the measurement and control uplink data link has a junction place.
The invention provides a method for realizing backup measurement and control channels of a spacecraft operation control channel, which is realized by a method for reconstructing the backup measurement and control channels of the operation control channel under the condition of no power failure and restarting by software.
Identifying and selecting availability of the on-board mutual backup channels:
and identifying uplink channels existing on the satellite, wherein the uplink channels comprise an L-frequency band operation control uploading channel and an S-frequency band measurement and control uploading channel. Functionally, the traffic channel is typically used to transmit load traffic data; the measurement and control channel is generally used for distance measurement and telemetry of satellites and remote control information transmission.
The space-borne computer software for analyzing the navigation satellite has the capability of module maintenance, and meanwhile, the measurement and control and operation control uplink data links have the junction, so that the hardware condition for mutual backup of two uplink channels is provided.
Multiplexing transmission information identification and coding design
And identifying the information source, and finding a data source from the operation control uplink data so that the data source can bear the measurement and control uplink data. The analysis information source should have the following characteristics:
(a) Scalable information source class code distance can be supported: the information source type code distance can distinguish new uplink remote control data from original service data, and has certain uplink identification capability;
(b) Has certain bearing capacity: the capacity Ly byte of the business data used for bearing the business, presume the information source identification code length is Lh byte, the maximum length of the remote control data is Lc byte; the remote control data, when not unpacked, satisfies:
Ly>＝Lh+Lc。
if unpacking, assuming the sequence field length is Lx, then:
2Lx(Ly-Lx-Lh)>＝Lc；
(c) With a certain bandwidth margin: the selected original service data source should be generally non-periodic uplink, and have a relatively rich bandwidth allowance.
And changing an uplink protocol of the operation control channel, and adding remote control uplink support in an application layer protocol of the operation control channel. In order to support any length of remote control uplink data, unpacking processing logic of remote control packets is provided in an application layer protocol. Let the borrowed uplink segment data length be L. The protocol logic after modification is:
in order to maximize the utilization of the original transmission resources, the protocol is designed with as few fields as possible, considering the limited data length of the original service. The protocol mainly comprises two fields, and the instruction head has two functions: i.e. to distinguish the new protocol from the original protocol, and if it is a new protocol, to distinguish the unpacking type at the same time.
When the transmitted packet is a dependent packet, it involves the use of an unpacking sequence count for packet reassembly. Indicating that the currently uploaded packet is the sequence number in the entire disassembled packet, the sequence count range is 0,1,2,3, ….
The maximum uplink remote control data length supported by the method is 256 x (L-2) bytes.
Information distribution path selection and security control
1) The data distribution path is designed as shown in fig. 1.
2) Safety control
Safety control is realized through three steps
(a) And (3) data verification: the method comprises the steps of checksum setting, length checking and the like;
(b) Classification control of instructions: for dangerous forbidden instructions, the control channel can be refused to ascend, and limiting measures are added in the distribution path;
(c) Large ring comparison function: for dangerous instructions, the function of forwarding is really performed, large-loop comparison is performed, after the ground is downloaded through uplink, the ground is confirmed, and after the confirmation instruction is sent, the data link is distributed.
Information reception recognition and decoding process
(1) If it is an independent packet, a head packet, a tail packet or a middle packet:
(a) And counting according to the unpacking sequence, taking out the instruction content, and carrying out remote control instruction uplink package grouping.
(b) A remote control data header, a length field checksum, etc. are obtained from the new packet. Checking the remote control data module, and sending the remote control data module to the remote control data module if the remote control data module is successful; otherwise, the packet is discarded.
(2) Otherwise, the processing is carried out according to the original operation control business processing logic.
The multiplexed information decoding flow is shown in detail in fig. 2.
By means of the upstream data packet of the operation control channel, the length of the data packet is 36 bytes, and the maximum length of the remote control instruction is 512 bytes.
| Sequence number | Identification mark | Identification value | Remarks |
| 1 | Independent bag | 0xc0 | |
| 2 | First bag | 0xc5 | |
| 3 | Tundish | 0xCa | |
| 4 | Tail bag | 0xcc |
The software maintenance adopts module level maintenance and is realized by an on-orbit injection mode.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The method for realizing the backup measurement and control channel of the spacecraft operation control channel is characterized by comprising the steps of information source identification, data distribution path and safety control;
the information source identification: searching a data source capable of bearing measurement and control uplink data in the operation and control uplink data;
the data distribution path: finding a distribution path in the operation control uplink data processing module and the remote control uplink data processing module, and distributing the data of the operation control uplink channel to the measurement and control uplink data processing module when the operation control uplink processing is performed;
the safety control: and safety control is carried out on the measurement and control uplink data.
2. The method for realizing backup measurement and control channels of the spacecraft operation control channel according to claim 1, wherein the operation control uplink data meets the following conditions:
(a) Scalable information source class code distance can be supported: the information source type code distance can distinguish the new uplink remote control data from the original service data;
(b) Has certain bearing capacity: the capacity Ly byte of the business data used for bearing the business, presume the information source identification code length is Lh byte, the maximum length of the remote control data is Lc byte; when the remote control data is not unpacked, ly > =lh+lc is satisfied, and if unpacked, 2Lx (Ly-Lx-Lh) > =lc should be satisfied assuming that the sequence field length is Lx;
(c) With a certain bandwidth margin: the selected original business data source is non-periodic uplink, and has a rich bandwidth allowance.
3. The method for implementing backup measurement and control channels of a spacecraft operation control channel according to claim 1, wherein the data distribution path selection should satisfy the following conditions:
(a) The method comprises the following steps of: if the two processing modules are located on different hardware devices, the two devices need to be provided with hardware links;
(b) The method comprises the following steps: the method has a corresponding application layer data transmission path or is maintained and opened through a software module.
4. The method for implementing backup measurement and control channels of a spacecraft operation control channel according to claim 1, wherein the performing safety control on measurement and control uplink data comprises
(a) And (3) data verification: the method comprises checksum setting and length verification;
(b) Classification control of instructions: for dangerous forbidden instructions, the control channel is generally refused to be uplifted;
(c) Large ring comparison function: for dangerous forbidden instructions, the dangerous forbidden instructions are really forwarded, large-loop comparison is performed, after the ground is downloaded through uplink, the ground is confirmed, and after the confirmation instructions are sent, the data links are distributed.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932049A (en) * | 2012-10-24 | 2013-02-13 | 北京空间飞行器总体设计部 | Information transmission method of spacecraft |
| CN107579889A (en) * | 2017-09-29 | 2018-01-12 | 北京迈特力德信息技术有限公司 | A kind of data transmission system and method |
| CN107817019A (en) * | 2017-10-06 | 2018-03-20 | 廖忠民 | LEO constellation disaster-proof monitoring systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004107185A1 (en) * | 2003-05-27 | 2004-12-09 | Macdonald, Dettwiler And Associates Ltd. | Satellite communications system for providing global, high quality movement of very large data files |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932049A (en) * | 2012-10-24 | 2013-02-13 | 北京空间飞行器总体设计部 | Information transmission method of spacecraft |
| CN107579889A (en) * | 2017-09-29 | 2018-01-12 | 北京迈特力德信息技术有限公司 | A kind of data transmission system and method |
| CN107817019A (en) * | 2017-10-06 | 2018-03-20 | 廖忠民 | LEO constellation disaster-proof monitoring systems |
Non-Patent Citations (1)
| Title |
|---|
| 杨永安,李建成,骆永进,冯祖仁,汪波.航天测控资源应用现状及综合利用研究.飞行器测控学报.2005,(第02期),全文. * |
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