CN102281095A - Task return method - Google Patents
Task return method Download PDFInfo
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- CN102281095A CN102281095A CN2011102142427A CN201110214242A CN102281095A CN 102281095 A CN102281095 A CN 102281095A CN 2011102142427 A CN2011102142427 A CN 2011102142427A CN 201110214242 A CN201110214242 A CN 201110214242A CN 102281095 A CN102281095 A CN 102281095A
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Abstract
A task return method comprises the following steps: (1) acquiring a measurement and control window; (2) calculating a return time length Ti of each return task; (3) setting a solid memory queue and a return queue, wherein the solid memory queue is a result of ordering all the return tasks according to a priority level and the initial return queue is empty; (4) carrying out accumulation to the Ti and starting from a head of the solid memory queue, and calculating a total return time length Tsum which satisfies the following formula: Tsum=sigma Ti; (5) determining whether the Tsum exceeds the Twindow when a new task is added, and entering into a step (6) if the Tsum does not exceed the Twindow and otherwise entering into the step (7); (6) adding the new added task to an end of the return queue, returning to the step (4), continuing to add till the solid memory queue is traversed and entering into the step (8), wherein the return queue of this time is the final return queue; (7) deleting the new added task and the tasks which are after the new added task and possess the same priority in the solid memory queue, returning to the step (4) and continuing to add; (8) emptying the solid memory queue and downloading the final return queue.
Description
Technical field
The invention belongs to spacecraft task scheduling field, relate to a kind of method of arranging the task of returning.
Background technology
Remote sensing satellite, particularly high-resolution earth observation satellite, its duration of work will produce a large amount of valid data.But, being limited by the restriction of aspects such as satellite volume, quality, power consumption, the amount of capacity that is used for preserving the solid-state memory (be called for short and deposit admittedly) of data on the star is subjected to strict restriction.Write when full when solid deposit data, satellite can't carry out data record again, also just lose its using value.Therefore, making satellite utilize ground station observing and controlling interval to carry out the data passback, discharge or empty and deposit the space admittedly, is one of critical function of remote sensing satellite.Through the construction of many decades, China has had a plurality of ground control stations at present, plays an important role in aerospace industry.But it is domestic that these ground stations all are distributed in China, and its observing and controlling interval range is subjected to certain restriction.And remote sensing satellite mostly is sun-synchronous orbit, move about 14 circles around the earth every day, can enter the circle time about half had only of China ground station observing and controlling interval range, each operational passback time window is the longest 10～15 minutes only, and the time window resource is very nervous.The solid deposit data of magnanimity and relatively low data passback speed allow this problem seem more outstanding especially.Because a variety of causes, satellite also can often be required to carry out some other task or action and can not return in these passback time windows, and this has aggravated the problem that passback is pressed for time with regard to further.
In order to satisfy the demand of satellite big data quantity task passback, should find the solution this from many aspects.Except adopting the emission repeater satellite, build overseas ground station, developing the rigid means of reinforcement passback abilities such as high-speed digital transmission antenna, also should adopt the available strategy of making rational planning for, make full use of the interval time window of observing and controlling, improve passback efficient as far as possible.
The existing task passback of satellite mode is that being arranged in the passback formation of task is arranged with the time sequencing of data record, promptly claps earlier earlier to pass.But under the condition that current satellite remote sensing technology is maked rapid progress, the remote sensing effect becomes more and more important, some data on the satellite, it is ageing perhaps even more important than data itself, the right that should have preferential passback, but wasted valuable time, lost its using value opportunity thereby cause missing because of being absorbed in very long passback formation wait process.In addition, whole valid data that existing task retransmission method is normally preserved observation mission carry out the integral body passback as a unit, and in the passback formation, task data amount size is not done differentiation, this can cause only having returned a big data quantity task in former instinct is carried out the time window of a plurality of small data quantity task passbacks.Use for satellite remote sensing, this is a kind of means of comparatively poor efficiency, can't fully satisfy the satellite remote sensing demands of applications.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, the method for the arrangement passback task of a kind of task efficiency of transmission height, convenient and flexible operation is provided.
Technical solution of the present invention is: a kind of retransmission method of task, and step is as follows:
(1) obtains the window time span T that satellite is about to the ground station observing and controlling interval of process
Window
(2) the passback time span T that each required by task is wanted in all N the passback tasks of the current satellite storage of calculating
i, i=1,2,3......N, computing formula is T
i=M
i/ S, wherein M
iBe i the shared amount of capacity of depositing admittedly of passback task, S passes the transmission speed of antenna for the satellite number;
(3) be provided with respectively and deposit formation and passback formation admittedly, wherein deposit formation admittedly and be the result of N passback task after according to the sequencing arrangement of priority, the task that priority is high comes the front, the needed passback time span of task T when priority is identical
iThe short front that comes, passback formation initial condition be a sky;
(4) begin successively to returning the passback time span T that required by task is wanted from the head of the queue of depositing formation admittedly
iAdd up, calculate total passback time span T
Sum=∑ T
i
(5) calculate when always returning time span, whenever increase a task newly, just judge T one time
SumWhether surpass T
WindowIf do not surpass, then enter step (6), otherwise enter step (7);
(6) that task that will increase newly in the time of will adding up adds the end of passback formation, returns step (4) then and proceeds to add up, and till all tasks in the formation of depositing admittedly all travel throughs, passback formation at this moment was final passback formation, enters step (8);
(7) that task that will increase newly in the time of will adding up and depositing admittedly comes after this task and all tasks deletions identical with the priority of this task in the formation, return step (4) then and proceed to add up;
(8) empty and deposit formation admittedly, simultaneously the task in the final passback formation is passed to the satellite data transmission subsystem successively, after satellite enters ground station observing and controlling interval, be back to ground station successively.
The present invention's advantage compared with prior art is: the method for this arrangement passback of the present invention task, to utilize the interval time window length of ground station's observing and controlling to carry out that data return efficiently be target as far as possible to satisfy, attributes such as the priority height for the treatment of passback task itself in depositing admittedly and passback time span have been taken into full account, according to the priority that does not return task in depositing admittedly, the length of required passback time, admittedly deposit formation and passback formation and the queue operation rule relevant by being provided with these two formations, under the prerequisite that satisfies priority and short passback time span, admittedly the task of depositing is reasonably screened and lined up, make the priority height, the short task of passback time span is given priority in arranging for as much as possible.By continuous adjustment queue sequence, obtain suitable passback formation arrangement result, made full use of ground station's passback window simultaneously, reach higher passback formation and arranged efficient.This method makes full use of the passback time span in observing and controlling interval, can guarantee under the condition of the priority of task passback of satisfying high priority and short passback time span, can allow satellite utilize the whole time in observing and controlling interval to carry out the data passback as far as possible efficiently, method is simple, amount of calculation is little, is fit to online real-time tracking and calculates.
Description of drawings
Fig. 1 is the FB(flow block) of the inventive method.
Embodiment
As shown in Figure 1, be the FB(flow block) of the inventive method, details are as follows for concrete steps:
(1) obtains the passback time window
Be about to parameters such as the ground control station latitude and longitude coordinates of process, minimum elevation angle threshold value according to orbit elements of satellite and satellite, can obtain to be used to carry out interval time started of observing and controlling, concluding time and the window time span T of data passback
WindowParameters such as (hereinafter to be referred as the passback windows).For satellite in orbit, this parameter uploads on the satellite in advance by ground station after being calculated by satellite orbit designer process usually.
(2) calculate the passback time span that each does not return required by task
Admittedly all N in depositing for current satellite do not return task (hereinafter to be referred as depositing task admittedly), calculate each successively and deposit the passback time span that required by task is wanted admittedly.Computing formula is:
T
i＝M
i/S(i∈1～N)
Wherein, T
iBe i and deposit the passback time span that required by task is wanted, M admittedly
iBe i and deposit the shared amount of capacity of depositing admittedly of task admittedly that S passes the following biography bit rate of antenna for the satellite number;
(3) be provided with deposit admittedly formation with the passback formation
Being provided with and depositing formation and the purpose that returns formation admittedly, is in order better passback to be dispatched and to arrange.By the execution to rule, the task of constantly will depositing is admittedly transferred to the passback formation from depositing formation admittedly according to a definite sequence, and particular content is embodied in step (4)～(7) of back.
In this step, according to priority setting of depositing task itself admittedly and required passback time span, the task of depositing is admittedly ranked.Priority is determined according to factors such as the data content of depositing task admittedly, application demands by satellite user unit, is generally artificial setting.Passback time span T
iIn step (2), calculate gained.The task of depositing of consolidating that priority is high comes the front, will return time span T when priority is identical
iThe short task of depositing of consolidating comes the front.This formation is called deposits formation admittedly.
An empty queue is set in addition, is called the passback formation;
(4) add up and ask total passback time span
To sequencing the task of depositing of consolidating of team, from depositing formation admittedly, successively its needed passback time span is added up to first opening the beginning, calculate total passback time span T
Sum(this process is hereinafter to be referred as adding up).Computing formula is:
T
sum＝∑T
i
The purpose that adds up be for judgement in step (5) admittedly the task of depositing return the needed time and whether surpass the length T of passback time window
WindowIt should be noted that in whole iterative process when entering step (4) for the first time, the counting of the action that adds up is started from scratch and added up; And from for the second time entering step (4), the counting that moves of adding up is not to start from scratch but total passback time span T of obtaining from last iteration
SumBeginning;
(5) judge to add up with whether overtime
In step (4), whenever add up once, just once judge, judge total passback time span T
SumWhether surpass passback time window T
WindowIf do not surpass, then enter step (6), otherwise, enter step (7);
(6) task of will depositing is admittedly transferred to the passback formation from depositing formation admittedly
That that will just carry out adding up in step (4) deposited the end that task adds the passback formation admittedly, from depositing this task of deletion the formation admittedly, constitutes new consolidating and deposits formation simultaneously.Like this, just realized the task of depositing is admittedly transferred to the operation of passback formation from depositing formation admittedly, and consolidating in the current passback formation deposited total passback time span T of required by task
SumCan not surpass passback time window T
Window
Formation substitution step (4) is deposited in new consolidating, the operation of proceeding to add up, the iterative process of repeating step (4)～(7), up to the operation that adds up arrive deposit admittedly the formation tail of the queue, all consolidate the task of depositing and all traveled through till.During this period, the task of depositing of consolidating that meets step (5) Rule of judgment is all transferred to the passback formation from depositing formation admittedly.Admittedly deposit the formation tail of the queue when the operation that adds up arrives, when iteration is finished, the passback formation of this moment is final passback formation.Enter step (8);
(7) deletion causes adding up and the overtime task of depositing of consolidating the formation from depositing admittedly
Cause at last from depositing the formation deletion admittedly that Rule of judgment is not inconsistent in the step (5), T
SumOvertime that deposited task admittedly.Because can't being transferred in the passback formation certainly, this task goes.Simultaneously, deposit the formation deletion admittedly and deposit identical all of the priority of task admittedly with this and deposit task admittedly, constitute new consolidating and deposit formation from remaining.Adopt this operation former because: admittedly deposit formation be according to priority from high to low, when priority is identical by depositing required by task passback time T admittedly
iArrange by few mode at the most.Therefore, if some tasks of depositing admittedly add up overtime, then depositing all identical with its priority in the formation follow-up tasks of depositing admittedly admittedly all affirms overtime, thereby can all delete from depositing the formation admittedly, directly change over to and next priority is deposited the operation that adds up of task admittedly (next priority is deposited task admittedly, admittedly deposit in the queue sequence former, come deleted back of depositing task admittedly).
Formation substitution step (4) is deposited in new consolidating, and the iterative process of repeating step (4)～(7) is finished until iteration, obtains final passback formation, enters step (8);
(8) carry out the data passback according to the passback formation
After above-mentioned iterative process is finished, obtained final passback formation.With the data transmission subsystem that the task of depositing passes to satellite successively of consolidating in the passback formation, passback successively after satellite enters ground station observing and controlling interval.
Embodiment
Consider that one is the satellite in Sun-synchronous orbit of 10:30 operate in 691km height, southbound node local time.Admittedly the observation mission of existing 11 needs passback in depositing on the star.According to the method described in the present invention, according to task priority and required passback time these 11 tasks are ranked earlier, admittedly deposited formation, and then it transferred in the passback formation one by one, up to the task passback formation that obtains passing to the most at last the satellite data transmission subsystem according to rule.
Suppose that simulated conditions is as follows:
Zero-time is: on 07 26th, 2009 00:00:00.
Satellite orbit parameter: semi-major axis of orbit: 7051203.012m, eccentricity: 0, orbit inclination angle: 97.308688 °, right ascension of ascending node: 249.784 °, argument of perigee: 0 °, latitude argument: 0 °;
Ground control station information: east longitude: 116.388 °, 39.9062 ° of north latitude
Number descends biography bit rate: 100MB/s
Admittedly the task of depositing: be provided with the task of depositing of consolidating of 11 needs passbacks altogether, its attribute is as shown in the table:
During table 1 is deposited admittedly not passback consolidate the task of depositing
| Mission number | Priority | Task data size (MB) |
| 82 | 8 | 30000 |
| 31 | 3 | 10000 |
| 74 | 7 | 15000 |
| 42 | 4 | 3000 |
| 51 | 5 | 5000 |
| 72 | 7 | 9000 |
| 81 | 8 | 20000 |
| 41 | 4 | 2000 |
| 71 | 7 | 8000 |
| 73 | 7 | 10000 |
| 52 | 5 | 6000 |
(1) obtains the passback window
According to satellite orbit parameter and ground control station information, can try to achieve the time window information in the observing and controlling interval of ground station.In this example, the interval zero-time of observing and controlling is 00:32:52, and the concluding time is 00:43:48, and the total time window is: T
Window=656s.
(2) calculate the passback time span
According to formula:
T
i＝M
i/S(i∈1～11)
Known each deposit the size of data of task and number admittedly to pass bit rate be S=100MB/s, can calculate each and deposit the passback time span that required by task is wanted admittedly.Concrete time span value sees the following form.As seen 11 tasks of depositing admittedly all descend biography to need 1180s altogether, but the passback window T of ground station
Window656s is only arranged, can not all return depositing task admittedly
(3) be provided with deposit admittedly formation and the passback formation
According to priority setting of depositing task itself admittedly and required passback time span, the task of depositing is admittedly ranked.The task of depositing of consolidating that priority is high comes the front, will return the short task of depositing of consolidating of time span when priority is identical and come the front.This formation is called deposits formation admittedly, as shown in the table:
Formation is deposited in consolidating after table 2 queuing
| Admittedly deposit formation sequence number (i) | Mission number | Priority | Required passback time span (T i，s) |
| 1 | 81 | 8 | 300 |
| 2 | 82 | 8 | 200 |
| 3 | 71 | 7 | 80 |
| 4 | 72 | 7 | 90 |
| 5 | 73 | 7 | 100 |
| 6 | 74 | 7 | 150 |
| 7 | 51 | 5 | 50 |
| 8 | 52 | 5 | 60 |
| 9 | 41 | 4 | 20 |
| 10 | 42 | 4 | 30 |
| 11 | 31 | 3 | 100 |
Simultaneously, an empty queue is set, is called the passback formation, as shown in the table:
The blank passback formation that table 3 is set
| Passback formation sequence number (i) | Mission number | Priority | Required passback time span (T i，s) |
(4) add up and ask total passback time span
To sequencing the task of depositing of consolidating of team, from depositing formation admittedly, successively its needed passback time span is added up to first opening the beginning, calculate total passback time span T
SumIn first time iteration, T
SumCount from zero, can get:
T
sum(1)＝0+T
1＝300s
And from for the second time, enter step (4) when carrying out iteration, T
SumWill since the last time obtain the counting, can get:
T
sum(2)＝T
sum(1)+T
2＝500s
T
sum(3)＝T
sum(2)+T
3＝580s
T
sum(4)＝T
sum(3)+T
4＝670s
The rest may be inferred.
(5) judge to add up with whether overtime
In step (4), whenever add up once, just once judge, judge total passback time span T
SumWhether surpass passback time window T
WindowIf do not surpass, then enter step (6), otherwise, enter step (7);
From step (4) as can be seen, at the T of first three time accumulation calculating gained
Sum, its value is respectively 300s, 500s, 580s, does not all surpass passback time window T
Window=656s.Therefore after adding up at every turn, first three time all will enter step (6) from step (5).
And the T of the 4th accumulation calculating gained
Sum, its value is 670s, surpasses passback time window T
Window=656s.Therefore after adding up for the 4th time, will enter step (7) from step (5).
(6) task of will depositing is admittedly transferred to the passback formation from depositing formation admittedly
That that will just carry out adding up in step (4) deposited the end that task adds the passback formation admittedly, from depositing this task of deletion the formation admittedly, constitutes new consolidating and deposits formation simultaneously.
Time add up with first three of carrying out in the step (4) and to be operating as example and to describe:
After adding up for the first time, No. 81 tasks of depositing admittedly in the formation are transferred to the passback formation from depositing formation admittedly, and No. 81 tasks are deleted from depositing the formation admittedly, constitute new consolidating and deposit formation.Entering step (4) proceeds to add up.
After adding up for the second time, No. 82 tasks of depositing admittedly in the formation are transferred to the passback formation from depositing formation admittedly, and No. 82 tasks are deleted from depositing the formation admittedly, constitute new consolidating and deposit formation.Entering step (4) proceeds to add up.
After adding up for the third time, No. 71 tasks of depositing admittedly in the formation are transferred to the passback formation from depositing formation admittedly, and No. 71 tasks are deleted from depositing the formation admittedly, constitute new consolidating and deposit formation.Entering step (4) proceeds to add up.
Add up at above-mentioned three times, after transfer and the deletion action, admittedly it is as shown in the table with the passback formation to deposit formation:
Table 4 is deposited formation and passback formation through consolidating after three iteration
At this moment, the passback total time of three required by task in the passback formation is 580s, does not surpass the passback window T of ground station
Window。
(7) deletion causes adding up and the overtime task of depositing of consolidating the formation from depositing admittedly
Cause at last from depositing the formation deletion admittedly that Rule of judgment is not inconsistent in the step (5), T
SumOvertime that deposited task admittedly.Because can't being transferred in the passback formation certainly, this task goes.Simultaneously, deposit the formation deletion admittedly and deposit identical all of the priority of task admittedly with this and deposit task admittedly, constitute new consolidating and deposit formation from remaining.
Add up with the 4th time of carrying out in the step (4) and to be operating as example and to describe:
After adding up for the 4th time, because T
SumSurpass T
Window, No. 72 tasks in the formation of therefore will depositing admittedly are from deleting from depositing the formation admittedly, and 73, No. 74 tasks that simultaneously will be identical with 72 task priorities are also deleted from depositing the formation admittedly simultaneously, constitute new consolidating and deposit formation.Entering step (4) proceeds to add up.
After the above-mentioned deletion action, admittedly deposit formation with the passback formation as shown in the table:
Table 5 is deposited formation and passback formation through consolidating after the 4th iteration
| Admittedly deposit formation sequence number (i) | Mission number | Priority | Required passback time span (T i，s) |
| 1 | 51 | 5 | 50 |
| 2 | 52 | 5 | 60 |
| 3 | 41 | 4 | 20 |
| 4 | 42 | 4 | 30 |
| 5 | 31 | 3 | 100 |
| 1 | 81 | 8 | 300 |
| 2 | 82 | 8 | 200 |
| 3 | 71 | 7 | 80 |
At this moment, the passback total time of three required by task in the passback formation is 580s, does not surpass the passback window T of ground station
Window
(8) carry out the data passback according to the passback formation
Iterate according to method described in step (4)～(7), arrive after tail of the queue, all tasks of depositing admittedly deposit formation admittedly all travel throughs up to the operation that adds up, admittedly deposit formation and return formation as shown in the table:
Consolidating after the whole iteration of table 6 are finished deposited formation and passback formation
At this moment, be cleared admittedly deposit formation, originally 11 not passback consolidate the task of depositing, have 6 in step (4)～(7), to be deleted from depositing the formation admittedly, remaining 5 are shifted in order and are arranged in the passback formation.The passback total time length of these 5 required by task is 650s, does not surpass the passback window T of ground station
Window
The passback formation of this moment is final passback formation.With the data transmission subsystem that the task of depositing passes to satellite successively of consolidating in the passback formation, passback successively after satellite enters ground station observing and controlling interval.
That is to say that satellite adopts the aforementioned calculation method, can finish the passback of the task of depositing admittedly on the star and arrange work.
The content that is not described in detail in the specification of the present invention belongs to those skilled in the art's known technology.
Claims (1)
1. the retransmission method of a task is characterized in that step is as follows:
(1) obtains the window time span T that satellite is about to the ground station observing and controlling interval of process
Window
(2) the passback time span T that each required by task is wanted in all N the passback tasks of the current satellite storage of calculating
i, i=1,2,3......N, computing formula is T
i=M
i/ S, wherein M
iBe i the shared amount of capacity of depositing admittedly of passback task, S passes the transmission speed of antenna for the satellite number;
(3) be provided with respectively and deposit formation and passback formation admittedly, wherein deposit formation admittedly and be the result of N passback task after according to the sequencing arrangement of priority, the task that priority is high comes the front, the needed passback time span of task T when priority is identical
iThe short front that comes, passback formation initial condition be a sky;
(4) begin successively to returning the passback time span T that required by task is wanted from the head of the queue of depositing formation admittedly
iAdd up, calculate total passback time span T
Sum=∑ T
i
(5) calculate when always returning time span, whenever increase a task newly, just judge T one time
SumWhether surpass T
WindowIf do not surpass, then enter step (6), otherwise enter step (7);
(6) that task that will increase newly in the time of will adding up adds the end of passback formation, returns step (4) then and proceeds to add up, and till all tasks in the formation of depositing admittedly all travel throughs, passback formation at this moment was final passback formation, enters step (8);
(7) that task that will increase newly in the time of will adding up and depositing admittedly comes after this task and all tasks deletions identical with the priority of this task in the formation, return step (4) then and proceed to add up;
(8) empty and deposit formation admittedly, simultaneously the task in the final passback formation is passed to the satellite data transmission subsystem successively, after satellite enters ground station observing and controlling interval, be back to ground station successively.
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| CN2011102142427A CN102281095A (en) | 2011-07-28 | 2011-07-28 | Task return method |
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|---|---|---|---|
| CN2011102142427A CN102281095A (en) | 2011-07-28 | 2011-07-28 | Task return method |
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|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393951A (en) * | 2014-10-21 | 2015-03-04 | 北京空间飞行器总体设计部 | Queuing based remote sensing load universal data processing system |
| CN107291566A (en) * | 2017-06-15 | 2017-10-24 | 北京京东尚科信息技术有限公司 | The method and apparatus that delay task is performed |
| CN111443868A (en) * | 2020-03-24 | 2020-07-24 | 北京市遥感信息研究所 | Remote sensing satellite solid memory erasing method and device |
| WO2024027466A1 (en) * | 2022-08-03 | 2024-02-08 | 中国电信股份有限公司 | Data sequential transmission method, system, network side device and application function entity |
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| CN102479085A (en) * | 2010-11-30 | 2012-05-30 | 中国人民解放军国防科学技术大学 | Agile satellite task planning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6931641B1 (en) * | 2000-04-04 | 2005-08-16 | International Business Machines Corporation | Controller for multiple instruction thread processors |
| CN102479085A (en) * | 2010-11-30 | 2012-05-30 | 中国人民解放军国防科学技术大学 | Agile satellite task planning method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393951A (en) * | 2014-10-21 | 2015-03-04 | 北京空间飞行器总体设计部 | Queuing based remote sensing load universal data processing system |
| CN104393951B (en) * | 2014-10-21 | 2017-11-17 | 北京空间飞行器总体设计部 | A kind of remote sensing load general data processing system based on queuing |
| CN107291566A (en) * | 2017-06-15 | 2017-10-24 | 北京京东尚科信息技术有限公司 | The method and apparatus that delay task is performed |
| CN107291566B (en) * | 2017-06-15 | 2020-06-05 | 北京京东尚科信息技术有限公司 | Method and device for delaying task execution |
| CN111443868A (en) * | 2020-03-24 | 2020-07-24 | 北京市遥感信息研究所 | Remote sensing satellite solid memory erasing method and device |
| WO2024027466A1 (en) * | 2022-08-03 | 2024-02-08 | 中国电信股份有限公司 | Data sequential transmission method, system, network side device and application function entity |
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Application publication date: 20111214 |