CN105281822A - Hardware framing telemetry arrangement method for different downloading period fixation channel position requirement - Google Patents
Hardware framing telemetry arrangement method for different downloading period fixation channel position requirement Download PDFInfo
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Abstract
The invention provides a hardware framing telemetry arrangement method for different downloading period fixation channel position requirement. The method comprises the steps: determining importance level of each telemetry parameter; calculating the difference between a main channel byte and an important parameter byte, and putting the most important parameters to a main channel and the rest important parameters to an auxiliary channel; by adopting a data reuse arrangement method for the rest important parameters in the auxiliary channel, improving downloading rate of the important parameters and finishing arrangement of ground telemetry frames; during in-orbit operation, software obtaining on/off states of the same kind of single-machine main back-up products; and according to the on/off states of the products and the priority of the products, the software autonomously carrying out judgment and using a time division multiplexing method, downloading the parameters, of which the priority is the highest, in the same channel, and giving time division multiplexing identification for ground decoding. The method ensures downloading period requirement of each telemetry parameter, improves telemetry downloading efficiency, and realizes autonomous adjusting of telemetry parameter downloading.
Description
Technical field
The present invention relates to satellite telemetry, be specifically related to a kind of difference and pass down the hardware framing remote measurement aligning method that the cycle fixes radio frequency channel status requirement.
Background technology
Along with the progressively development of satellite technology, the function of satellite also from strength to strength, be also on the increase, and this has higher requirement to the design of telemetry by the data class that satellite can provide and quantity.The efficiency how improving data down transmission is the problem that many design of satellites engineers will consider, and the ability that passes down improving data is most important to the diagnosis of satellite health, control, rescue and maintenance.
The packet telemetry standard of CCSDS definition has become the main stream approach of current satellite telemetering data formal definition now, and it carries out layering dynamic management in the mode of subpackage to data, completes the Programmed PCM Telemetry system of multiple source multi-user telemetry data transmission.NASA (NASA) all have employed packet telemetry on many aircraft such as Hubble Telescope, GAMMA detector, solar orbit station, interplanetary flight task (MARS), Jia Lilve.ESA also uses packet telemetry at European data relay satellite, geodetic satellite, You Lika etc.In recent years, the satellite telemetering data formal definition of China also more and more uses packet telemetry, to the theoretical research of packet telemetry and practical application also more and more ripe.
At present, China's satellite uses more packet telemetry to be unified remote measurement that is a kind of and PCM remote measurement compatibility, i.e., on the basis of CCSDS standard, reduce and increase partial content.But the design of domsat is due to the restriction of many factors, remote measurement speed is general not high, and especially under USB TT & C architecture, remote measurement speed is generally no more than 8192bps.Therefore, how when remote measurement rate-constrained by reasonably designing measuring and control data structure and form uses packet telemetry, become our urgent problem with the demand meeting actual task.
Summary of the invention
The present invention is intended to propose a kind of difference and passes down the hardware framing remote measurement aligning method that the cycle fixes radio frequency channel status requirement, can improve the efficiency that remote measurement passes down, again by the autonomous adjustment that telemetry parameter passes down, improve the ability of satellite automated operation.
In order to reach above-mentioned purpose, the invention provides a kind of difference and passing down the hardware framing remote measurement aligning method that the cycle fixes radio frequency channel status requirement, comprising the steps:
1) importance information of each telemetry parameter is determined;
2) add up the gap between main channel byte and important parameter byte, be positioned in main channel by most important parameter, remaining important parameter is positioned in complementary wave road;
3) aligning method by being reused by residue important parameter usage data in complementary wave road, improves the biography speed down of important parameter, completes the arrangement of ground telemetering frame;
4), time in orbit, software obtains the on-off state of the active and standby part product of same type unit;
5) according to the on-off state of product and the priority of product, soft ware autonomously carry out judging and use time-multiplexed method, in same radio frequency channel, passing down the high parameter of priority, and providing time-multiplexed mark for ground decoding;
6) repeat step 4, realize continuously remote measurement in-orbit and independently adjust.
Further, above-mentioned steps 1) in, the important telemetry parameter of reflection platform normal function comprises: time a, distant control chain circuit state b, busbar voltage c, electric current d, Satellite Angle speed e on star; Reflect that the important telemetry parameter of the main application function of whole star comprises: control system state f, battery charging and discharging electric current g, Shunt Voltage h.
In some embodiments, in described step 5), for active and standby part unit of same type, its on-off state and priority are that software is retrievable, and can not open in the most of the time simultaneously, therefore can improve lower transfer efficiency by time-multiplexed method; Software is autonomous according to the active and standby on-off state of part unit and the priority of each unit in-orbit, in same radio frequency channel, the high telemetry parameter of current time priority is passed down by predetermined Design Rule, in same frame, provide time-multiplexed mark, when decoding for ground simultaneously.
Tool of the present invention has the following advantages: compared with prior art, the present invention passes under the cycle fixes the FPGA hardware framing remote mode of radio frequency channel status requirement under difference, employ data reusing and time-multiplexed method simultaneously, and time-multiplexed method is carried out judgement voluntarily by software on star first and is used, both ensure that the biography cycle requirement down of each telemetry parameter, turn improve the efficiency that remote measurement passes down, thus realize the autonomous adjustment that telemetry parameter passes down, improve the ability of satellite automated operation.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the flow chart embodiment of the present invention different biography cycle down fixing the hardware framing remote measurement aligning method of radio frequency channel status requirement;
Fig. 2 is the flow chart of embodiment of the present invention data reusing method;
Fig. 3 is the flow chart of embodiment of the present invention time-division multiplexing method.
Embodiment
See the accompanying drawing that the embodiment of the present invention is shown, hereafter in more detail the present invention will be described.But the present invention can realize in many different forms, and should not be construed as by the restriction in the embodiment of this proposition.
Description is described a kind of difference of the present invention in detail and is passed down the hardware framing remote measurement aligning method that the cycle fixes radio frequency channel status requirement, and as shown in Figure 1, concrete steps are as follows:
1. determine the importance information of each telemetry parameter
Important telemetry parameter mainly comprises biography interval down and is respectively the telemetry parameter of 0.5s etc., and this kind of telemetry parameter reflection platform feature and the main application function of whole star, need to pass under higher speed.The important telemetry parameter of reflection platform normal function comprises: time a, distant control chain circuit state b, busbar voltage c, electric current d, Satellite Angle speed e etc. on star.Reflect the important telemetry parameter of the main application function of whole star, comprising: the telemetry parameters such as control system state f, battery charging and discharging electric current g, Shunt Voltage h.
General telemetry parameter mainly comprises biography interval down and is respectively the telemetry parameter of 2s, 8s, 32s etc., these telemetry parameters are the slow time variant voltage signal of whole star, the Temperature Quantity etc. of slow change mainly, mainly comprises secondary power supply voltage, state, the Temperature Quantity of each product unit of whole star.
2. design needs the parameter being positioned over main channel and complementary wave road
Because the biography cycle down of main channel is 0.5s, and pass under the telemetry parameter in complementary wave road and be spaced apart 2s, 8s etc., and the important telemetry parameter of the limited inadequate satellite of the byte-sized of main channel is all put into.Therefore, consider through priority, the most important telemetry parameter that main channel is put in design is as follows:
Time a, distant control chain circuit state b, busbar voltage c, electric current d, Satellite Angle speed e, control system state f on star.
By remaining general important parameter: battery charging and discharging electric current g, Shunt Voltage h etc. put into complementary wave road.
3. the method that usage data is reused arranges residue important parameter
As shown in Figure 2, after remaining general important parameter puts into complementary wave road, the cycle that passes under the fastest remote measurement also only has 2s, under 2s, therefore pass the biography speed down that method that in the radio frequency channel in cycle, usage data is reused improves general important parameter.Method is as follows:
A) in the 2s cycle radio frequency channel of the first frame, data g, h is put into;
B) in the 2s cycle radio frequency channel of the 3rd frame, data g, h is put into;
C) in the 2s cycle radio frequency channel of the 5th frame, put into data g, h, in odd number frame, put into g, h by that analogy.Because the crossing under the remote measurement of hardware of 2s cycle is 4 frame one circulation, therefore in this way, the biography renewal frequency down that g, h realize 1s in the cycle radio frequency channel of biography down of 2s is achieved.
4., time in orbit, software obtains the active and standby product on-off state of same type unit
Satellite in orbit time, whole star software obtains active and standby part on-off state of same type unit.Active and standby part unit of known a certain type has 3 to be respectively I, II, III, and corresponding telemetry parameter has m, n, o.Because time in-orbit, three units seldom can be started shooting simultaneously, also be m, n, o tri-telemetry parameters have the situation simultaneously exporting data hardly, but when remote measurement arranges, parameter m, n, o is all needed to be arranged in the large table of remote measurement, otherwise the data that will can't see when unit is started shooting.
5. soft ware autonomously to judge, and use time-division multiplexing method down-transmitting data
From the 4th, as passed m, n, o all down in the large table of the remote measurement of same frame, then in the most of the time, have the unit of backup not start shooting, then the telemetry parameter of its correspondence is nonsensical, wastes the resource of remote measurement.
As Fig. 3, by the judgement of software to 3 units I, II, III on-off state, and known unit priority-level is as follows: unit I > unit II > unit III, what then software can be autonomous uses time-multiplexed method according to the priority of on-off state and product, in same radio frequency channel, pass down the high parameter of current time priority, radio frequency channel resource can be saved.Concrete grammar is as follows:
A) two radio frequency channel resources are only arranged to unit I, unit II, unit III;
B) when only have unit I to start shooting only have unit II to start shooting or unit I, unit II are started shooting or all do not start shooting or all start shooting when, pass m, n two parameters under radio frequency channel;
C) when only having unit III to start shooting or unit I, unit III are started shooting, m, o two parameters under radio frequency channel, are passed;
D) when only having unit II, unit III is when starting shooting, and passes o, n two parameters under radio frequency channel.
E), after the parameter passed under needs judged by software according to above principle, in status word, the mark that this passes down radio frequency channel parameter is passed down.Under provide sign 1 when passing m, n parameter, under pass m, o parameter time provide sign 2, under pass m, o parameter time provide sign 3.
F) software on ground is according to passing 1,2,3 of mark down, uses different desorption coefficients to decoding data respectively.
6. skip to step 4 to continue to judge
Repeat step 4, realize the autonomous in-orbit telemetry parameter adjustment of software, improve the efficiency that remote measurement passes down, also improve the automatic operating ability of satellite.
Compared with prior art, its advantage and beneficial effect are:
1) pass in radio frequency channel slow, the method that usage data is reused, pass speed under some important parameters are improved, meet the needs that ground telemetering is observed, solve simultaneously and pass the limited problem of radio frequency channel size soon;
2) time in orbit, carried out voluntarily judging and using time-multiplexed method by software on star first, the high parameter of current time priority is passed down in same radio frequency channel, improve the efficiency that remote measurement passes down, also achieve the autonomous adjustment that telemetry parameter passes down, improve the ability of satellite automated operation.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.
Claims (5)
1. difference passes down the hardware framing remote measurement aligning method that the cycle fixes radio frequency channel status requirement, it is characterized in that, comprises the steps:
1) importance information of each telemetry parameter is determined;
2) add up the gap between main channel byte and important parameter byte, be positioned in main channel by most important parameter, remaining important parameter is positioned in complementary wave road;
3) aligning method by being reused by residue important parameter usage data in complementary wave road, improves the biography speed down of important parameter, completes the arrangement of ground telemetering frame;
4), time in orbit, software obtains the on-off state of the active and standby part product of same type unit;
5) according to the on-off state of product and the priority of product, soft ware autonomously carry out judging and use time-multiplexed method, in same radio frequency channel, passing down the high parameter of priority, and providing time-multiplexed mark for ground decoding;
6) repeat step 4, realize continuously remote measurement in-orbit and independently adjust.
2. the autonomous remote measurement aligning method of hardware framing according to claim 1, it is characterized in that, in described step 1), the important telemetry parameter of reflection platform normal function must fast under pass, this comprises: time a, distant control chain circuit state b, busbar voltage c, electric current d, Satellite Angle speed e on star; Reflect that the important telemetry parameter of the main application function of whole star comprises: control system state f, battery charging and discharging electric current g, Shunt Voltage h.
3. the autonomous remote measurement aligning method of hardware framing according to claim 1, is characterized in that, described step 2) in, the biography cycle down of main channel is 0.5s, passes and be spaced apart 2s, 8s under the telemetry parameter in complementary wave road.
4. the autonomous remote measurement aligning method of hardware framing according to claim 3, is characterized in that, in described step 3), general important parameter is put into complementary wave road, and the biography cycle down in complementary wave road is fixing, passes under being solidified the framing realized by hardware FPGA.
5. the autonomous remote measurement aligning method of hardware framing according to claim 1, it is characterized in that, in described step 5), for active and standby part unit of same type, its on-off state and priority are that software is retrievable, and can not open in the most of the time simultaneously, therefore can improve lower transfer efficiency by time-multiplexed method; Software is autonomous according to the active and standby on-off state of part unit and the priority of each unit in-orbit, in same radio frequency channel, the high telemetry parameter of current time priority is passed down by predetermined Design Rule, in same frame, provide time-multiplexed mark, when decoding for ground simultaneously.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106094587B (en) * | 2016-06-23 | 2018-07-24 | 中国空间技术研究院 | A kind of satellite frame telemetry channel determines system and method |
| CN113193899A (en) * | 2021-03-04 | 2021-07-30 | 上海航天控制技术研究所 | Time division multiplexing satellite telemetry method and apparatus |
| CN113364511A (en) * | 2021-05-11 | 2021-09-07 | 上海卫星工程研究所 | Equilibrium transfer computing method and system based on CCSDS packet telemetry |
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| US6973037B1 (en) * | 2000-05-04 | 2005-12-06 | Nortel Networks Limited | System and method for dynamically varying integrated services digital network (isdn) interface bandwidth |
| CN103582147A (en) * | 2012-08-03 | 2014-02-12 | 上海航天测控通信研究所 | Dynamic virtual channel dispatcher based on FPGA and dispatching method thereof |
| CN103874214A (en) * | 2014-04-10 | 2014-06-18 | 重庆大学 | Near space self-adaptive dynamic bandwidth allocation method |
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Cited By (3)
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| CN106094587B (en) * | 2016-06-23 | 2018-07-24 | 中国空间技术研究院 | A kind of satellite frame telemetry channel determines system and method |
| CN113193899A (en) * | 2021-03-04 | 2021-07-30 | 上海航天控制技术研究所 | Time division multiplexing satellite telemetry method and apparatus |
| CN113364511A (en) * | 2021-05-11 | 2021-09-07 | 上海卫星工程研究所 | Equilibrium transfer computing method and system based on CCSDS packet telemetry |
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