CN109543321A - Time window generating method and device - Google Patents
Time window generating method and device Download PDFInfo
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- CN109543321A CN109543321A CN201811443434.3A CN201811443434A CN109543321A CN 109543321 A CN109543321 A CN 109543321A CN 201811443434 A CN201811443434 A CN 201811443434A CN 109543321 A CN109543321 A CN 109543321A
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Abstract
The application provides a kind of time window generating method and device.The described method includes: obtaining the object longitude and object latitude value of target object；Obtain current longitude of the substar at current time of satellite, current latitude value；Judge current target object whether in default observation area according to the object longitude, the object latitude value, the current longitude and the current latitude value；Determine that satellite in-flight can be to the time range that target object is observed around ground according to multiple moment points of the target object in the default observation area.Scheme described in the embodiment of the present application determines the time range that can observe target object according to the position of target object and the position of each moment point substar, and therefore, the embodiment of the present application can greatly improve computational efficiency, saves and calculates the time.
Description
Technical field
This application involves satellite imagery technical fields, in particular to a kind of time window generating method and device.
Background technique
Calculate satellite to the observation time window of object ground object when, often first calculate the imaging region of satellite
Coordinate and target object range coordinate, it is then that imaging region and target object identical latitude moment that comes into existence is straight
Do not have in the time span between the identical latitude moment to imaging region and target object, imaging region whether coverage goal object
Body judges whether the period is access time window.
In the prior art, this mode for obtaining observation time window needs to calculate each moment in each calculate
Then the coordinate of point imaging region judges the period that target object may be covered by imaging region, later again in this time
The relationship between each coordinate between the coordinate position and imaging region and target object of imaging region is calculated in section again, because
This, this calculation is computationally intensive, low efficiency.
Summary of the invention
In order to overcome above-mentioned deficiency in the prior art, the application's is designed to provide a kind of time window generation side
Method, which comprises
Obtain the object longitude and object latitude value of target object；
Obtain current longitude of the substar at current time of satellite, current latitude value；
According to the object longitude, the object latitude value, the current longitude and the current latitude value judgement
Whether current target object is in default observation area；
Determine that satellite in-flight may be used around ground according to multiple moment points of the target object in the default observation area
With the time range observed target object.
Optionally, the method also includes in-flight can be to the time that target object is observed around ground according to satellite
Range obtains the image including target object.
Optionally, the substar for obtaining satellite is wrapped in the step of current longitude, current latitude value at current time
It includes:
The initial longitude of acquisition initial time substar and initial latitude value；
According to the substar of the initial longitude and the initial latitude acquisition satellite relative to zero degree warp in longitude
First operation angle of direction operation and the second operation angle run relative to zero degree weft in latitude direction；
The current longitude of current time substar is calculated according to first operation angle and second operation angle
Value and current latitude value.
Optionally, described according to the initial longitude and the initial latitude obtains the substar of satellite relative to zero degree
The first operation angle and the second operation angle run relative to zero degree weft in latitude direction that warp is run in longitudinal
The step of spending include:
Obtain the orbit inclination angle of current time satellite；
Obtain total operation angle of the current time satellite with respect to initial time；
Described the is calculated according to the initial longitude, the initial latitude, total operation angle and the orbit inclination angle
One operation angle and second operation angle.
Optionally, the method also includes:
The speed of service of satellite is calculated according to the orbit radius of satellite；
The orbital period of satellite is calculated according to the speed of service of satellite and the orbit radius；
It is described obtain current time satellite with respect to initial time total operation angle the step of include:
Total operation angle is calculated according to the orbital period of satellite and at the time of at current time point.
Optionally, described according to the object longitude, the object latitude value, the current longitude and described current
Latitude value judges whether the step in default observation area includes: current target object
Judge the difference of longitude of the object longitude and the current longitude whether in the first preset range, the object
Whether the difference of latitude of body latitude value and the current latitude value is in the second preset range；
If the difference of longitude is in the first preset range and the difference of latitude is in the second preset range, current time
The target object is in default observation area.
Optionally, it is described according to multiple moment points of the target object in the default observation area determine satellite around
The step of ground in-flight can be to the time range that target object is observed are as follows:
Judge whether there is multiple continuous moment points of the target object in default observation area；
If it is present determining satellite around ground in-flight according to the time between two endpoints of the continuous moment point
It can be to the time range that target object is observed.
The another object of the application is to provide a kind of time window generating means, and described device includes: the first acquisition mould
Block, second obtain module, judgment module and time determining module；
The first acquisition module is used to obtain the object longitude and object latitude value of target object；
The second acquisition module is used to obtain current longitude of the substar at current time of satellite, current latitude
Value；
The judgment module is used for according to the object longitude, the object latitude value, the current longitude and institute
Whether state current latitude value judges current target object in default observation area；
The time determining module is for multiple moment points according to the target object in the default observation area
Determine that satellite in-flight can be to the time range that target object is observed around ground.
Optionally, described device further includes control module, and the control module is used for in-flight can be with around ground according to satellite
The time range control image capture device observed target object obtains the image including target object.
The second acquisition module includes the first acquisition submodule, the second acquisition submodule and computing module；
First acquisition submodule be used for obtain initial time substar initial longitude and initial latitude value；
Second acquisition submodule is used to be obtained according to the initial longitude and the initial latitude under the star of satellite
The first operation angle that point run relative to zero degree warp in longitudinal and relative to zero degree weft in the operation of latitude direction
The second operation angle；
The computing module is used to calculate current time according to first operation angle and second operation angle
The current longitude of substar and current latitude value.
In terms of existing technologies, the application has the advantages that
Current longitude and current latitude value of the embodiment of the present application by the substar of calculating current time satellite, then
Target object is judged according to the object longitude and object latitude value of current longitude and current latitude value and target object
Whether in the default observation area of current time satellite, to judge whether the moment can observe target object, then
The time range of target object can be observed according to multiple moment point determinations of the object in the observation area.In the process
In, due to only needing to calculate the longitude and latitude of target object Yu each moment substar, so calculation amount greatly reduces, thus
The formation efficiency of time window can be greatly improved.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the schematic block diagram of time window generating device provided by the embodiments of the present application；
Fig. 2 is the flow diagram one of time window generating method provided by the embodiments of the present application；
Fig. 3 is the flow diagram two of time window generating method provided by the embodiments of the present application；
Fig. 4 is the flow diagram provided by the embodiments of the present application for obtaining current longitude, current latitude value；
Fig. 5 is the flow diagram of first operation angle of calculating provided by the embodiments of the present application, the second operation angle；
Whether Fig. 6 judges target object in the flow diagram for presetting observation area to be provided by the embodiments of the present application；
Fig. 7 is the schematic diagram of the time window of determining observable target object provided by the embodiments of the present application；
Fig. 8 is the track schematic diagram of substar provided by the embodiments of the present application；
Fig. 9 is the result schematic diagram provided by the embodiments of the present application for generating time window；
Figure 10 is the structural block diagram one of time window generating means provided by the embodiments of the present application；
Figure 11 is the structural block diagram two of time window generating means provided by the embodiments of the present application.
Icon: 100- time window generating device；110- processor；120- memory；130- communication unit；The 200- time
Window generating means；210- first obtains module；220- second obtains module；230- judgment module；240- time determining module；
The first acquisition submodule of 221-；The second acquisition submodule of 222-；223- computing module.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments herein provided in the accompanying drawings is not intended to limit below claimed
Scope of the present application, but be merely representative of the selected embodiment of the application.Based on the embodiment in the application, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model of the application protection
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
Term " first ", " second ", " third " etc. are only used for distinguishing description, are not understood to indicate or imply relatively heavy
The property wanted.
In the description of the present application, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in this application.
Referring to Figure 1, Fig. 1 is time window generating device 100 provided by the embodiments of the present application, and the equipment includes processing
Device 110 and memory 120, the memory 120 are stored with executable instruction, and the processor 110 can with the memory 120
Interactive connection, for executing the executable instruction.
In the present embodiment, the time window generating device 100 can also include communication unit 130, the communication unit
130 can interconnect respectively with the processor 110, the memory 120.
In the time window generating device 100 of the present embodiment, the memory 120 be may be, but not limited to, and be deposited at random
Access to memory 120 (Random Access Memory, RAM), read-only memory 120 (Read Only Memory, ROM), can
Program read-only memory 120 (Programmable Read-Only Memory, PROM), erasable read-only memory 120
(Erasable Programmable Read-Only Memory, EPROM), 120 (Electric of electricallyerasable ROM (EEROM)
Erasable Programmable Read-Only Memory, EEPROM) etc..Wherein, memory 120 is executable for storing
Instruction, the processor 110 execute the instruction after receiving executable instruction.
Fig. 2 is referred to, Fig. 2 is the time window generation side provided by the embodiments of the present application that can be applied on the above-described equipment
The flow diagram of method, the method includes the steps S110- step S140.
Step S110 obtains the object longitude and object latitude value of target object.
The longitude (object longitude) and target object that the present embodiment is used to obtain target object position are in place
The latitude value (object latitude value) set.Specifically, object longitude and object latitude value can be the longitude that has been stored with and
Latitude value is also possible to be got by satellite position and the calculating of its acquired image.
Fig. 3 is referred to, optionally, in the present embodiment, after step S110, the method also includes step S210- steps
S220。
Since the orbit radius of satellite is known, therefore in the present embodiment, step S210, according to the orbit radius meter of satellite
Calculate the speed of service of satellite.
Specifically, when calculating the operation speed v of satellite, flight speed can be calculated according to Formula of Universal Gravitation in the present embodiment
V is spent, the calculation formula of v is as follows:
Wherein, G is the universal gravitational constant of the earth, and M is the quality of satellite, and R is the radius of the earth, and h is the flight of satellite
Highly.
Step S220 calculates the orbital period of satellite according to the speed of service of satellite and the orbit radius.
The present embodiment is used to calculate the orbital period P of satellite, calculates the calculation formula of the orbital period P of satellite are as follows:
In the present embodiment, step S210- step S220 can also be carried out before step S110.
Step S120 obtains current longitude of the substar at current time of satellite, current latitude value.
The present embodiment for when calculating current time, the longitude (current longitude) of the substar of satellite and satellite
The latitude value (current latitude value) of substar.
Fig. 4 is referred to, optionally, in the present embodiment, step S120 includes sub-step S121-S123.
Step S121, the initial longitude of acquisition initial time substar and initial latitude value.
For example, the time is indicated with t, if the t=0 moment is initial time, then where the substar of t=0 moment satellite
The longitude i.e. initial longitude of the moment substar, under latitude value i.e. moment star where the substar of t=0 moment satellite
The initial latitude value of point.When t=0, the latitude and longitude coordinates (w of substar0, h0)。
Step S122 calculates the first operation angle and the second operation angle of substar.According to the initial longitude and
The initial latitude obtains the first operation angle and phase that the substar of satellite is run relative to zero degree warp in longitudinal
The second operation angle run for zero degree weft in latitude direction.
Fig. 5 is referred to, optionally, step S122 includes sub-step S1221- step S1223 in the present embodiment.
Step S1221 obtains the orbit inclination angle of current time satellite.
In the present embodiment, the orbit inclination angle of satellite can be known.
Step S1222 obtains total operation angle of the current time satellite with respect to initial time.Current time satellite is relatively just
Begin the moment total operation angle, that is, t moment satellite relative to initial position operation angle β.The calculation formula of β are as follows:
The π of β=2 t/P
Step S1223 calculates first operation angle and second operation angle.The present embodiment is used for according to
Initial longitude, the initial latitude, total operation angle and the orbit inclination angle calculate first operation angle and described
Second operation angle.
The present embodiment is used to calculate the substar of satellite in substar position of the t moment with respect to initial time satellite in longitude
Direction and latitude direction have been separately operable how many radian.
Wherein, the calculation formula of the first operation angle and the second operation angle of t moment substar are as follows:
Wherein, (wt,ht) t moment substar latitude and longitude coordinates.α be certain known satellite orbit inclination angle (orbit plane with
The angle of equatorial plane), β is t moment satellite relative to initial position operation angle (namely under the star of earth surface satellite
Point is in the radian that t moment is operation described in opposite initial time), T indicates the maximum value of t, that is, set as needed sentences
Whether disconnected target object is in the end time point for presetting observation area.
Step S123, the current longitude of calculating current time substar and current latitude value.The present embodiment is used for basis
The current longitude and current latitude of first operation angle and second operation angle calculating current time substar
Value.
The present embodiment is used to for the first operation angle of t moment and the second operation angle being transformed into and limit in numberical range:
Wherein, (w't,h't) be t moment substar latitude and longitude coordinates conversion value.For example, can be by t moment substar
Calculation of longitude & latitude numerical value is transformed into [0,360] respectively, [- 90,90].
In the present embodiment, the first operation angle of t moment and the second operation angle are transformed into and limited in numberical range, energy
Whether enough target objects that quickly and easily calculates are in default observation area.
Please continue to refer to Fig. 2, step S130, judge current target object whether in default observation area.
Specifically, this implementation is for according to the object longitude, the object latitude value, the current longitude and institute
Whether state current latitude value judges current target object in default observation area.
The present embodiment is for judging whether target object is at the observable region (default observation area) of satellite.
For example, can be using the image capture device on satellite as observation point.Using the observation point and the substar of satellite as axis, the sight
Measuring point is fixed point one cone of setting, then using the region on the inside of the cone as Observable region.At this point, satellite can
Observation area is border circular areas.
Fig. 6 is please referred to, optionally, in the present embodiment, step S130 includes sub-step S131- sub-step S132.
Whether step S131 judges the difference of longitude of the object longitude and the current longitude in the first preset range
It is interior.Whether the difference of latitude of the object latitude value and the current latitude value is in the second preset range.
Specifically, it can be determined that whether within a preset range.
When default observation area be include all areas in certain longitude range and certain dimensional extent when, can also lead to
Following formula mode is crossed to judge.
Δ=360 (R+h) tan φ/(2 π R)
σtIt is 01 variables, the expression of σ (t)=1 can observe earth's surface target observation object, and the expression of σ (t)=0 cannot be seen
Earth's surface target observation object is measured, wherein φ is that (observation point of satellite is formed by taper observation area for the view angle of satellite
Maximum angle), wd, hdLatitude (object latitude where longitude (object longitude) where respectively indicating target object and target object
Value)
Sub-step S132, if the difference of longitude is in the first preset range and the difference of latitude is in the second preset range
Interior, then target object described in current time is in default observation area.
For example, can execute step S120- step S130 since the t=0 moment in the present embodiment, execute step every time
After rapid S120- step S130, current time point is updated, t=t+1 is made, then repeats step S120- step S130 again, until
To preset stop condition is met, for example, reaching preset dwell time point T.
Please continue to refer to Fig. 2, step S140, determine that satellite in-flight can be to the time that target object is observed around ground
Range.The present embodiment is used to determine satellite around ground according to multiple moment points of the target object in the default observation area
It in-flight can be to the time range that target object is observed.
Fig. 7 is please referred to, optionally, in the present embodiment, step S140 includes sub-step S141- step S142.
Step S141 judges whether there is multiple continuous moment points of the target object in default observation area.
Step S142, if it is present determining satellite according to the time between two endpoints of the continuous moment point
It in-flight can be to the time range that target object is observed around ground.
This step can make the value between two endpoints of continuous moment point after obtaining a series of continuous moment point
It can observe the time range (time window) of target object for one.
Optionally, the method also includes step S150.Please continue to refer to Fig. 3, step S150, according to the acquisition time
The image of window acquisition target object.That is, according to satellite around ground can in-flight observe target object when
Between range obtain include target object image.
Illustrate the scheme of the present embodiment with a specific example for generating time window below.
The orbit altitude of LEO satellite is set as 998.95 kilometers, the orbit inclination angle (being expressed as α) of satellite is 85 °, initial to pass through
Latitude coordinate is (0 °, 0 °), and satellite Observable inclination angle is φ=27 °.According to above-mentioned steps, acquire in [0,5760] time range
The latitude coordinates of various time points substar are drawn in stipulated time range T, the trace of substar, as shown in Figure 8.In Fig. 8,
10 target objects, are plotted as color triangle symbol, are generated at random within Chinese territory, and 10 target object longitudes and latitudes are sat
It is designated as shown in table 1.
The latitude and longitude coordinates of 1 10 target object of table
| Observed object | Latitude and longitude coordinates (unit °, °) |
| 1 | (83,35) |
| 2 | (78,24) |
| 3 | (93,7) |
| 4 | (128,44) |
| 5 | (88,48) |
| 6 | (78,5) |
| 7 | (128,13) |
| 8 | (77,4) |
| 9 | (131,47) |
| 10 | (90,1) |
Please refer to Fig. 9, the time window in the present embodiment of the position Fig. 9.
Fig. 9 is please referred to, the another object of the application is to provide a kind of time window generating means 200, and time window is raw
Time window life can be stored in the memory 120 in the form of software or firmware or be solidificated in by including one at device 200
Software function module in the operating system (operating system, OS) of forming apparatus.Described device includes: the first acquisition mould
Block 210, second obtains module 220, judgment module 230 and time determining module 240.
The first acquisition module 210 is used to obtain the object longitude and object latitude value of target object.
In the present embodiment, the first acquisition module 210 can be used for executing step S110, about retouching for the first acquisition module 210
It states, please refers to step S110.
The second acquisition module 220 is used to obtain current longitude of the substar at current time of satellite, current latitude
Angle value.
In the present embodiment, the second acquisition module 220 can be used for executing step S120, about retouching for the second acquisition module 220
It states, please refers to step S120.
The judgment module 230 be used for according to the object longitude, the object latitude value, the current longitude and
Whether the current latitude value judges current target object in default observation area.
In the present embodiment, judgment module 230 can be used for executing step S130, and the description as described in judgment module 230 please refers to
Step S130.
The time determining module 240 is for multiple moment according to the target object in the default observation area
Point determines that satellite in-flight can be to the time range that target object is observed around ground.
In the present embodiment, time determining module 240 can be used for executing step S140, about retouching for time determining module 240
It states, please refers to step S140.
Figure 10 is please referred to, optionally, described device further includes control module, and the control module is used for according to satellite around ground
In-flight the image including target object can be obtained to the time range control image capture device that target object is observed.
The second acquisition module 220 includes the first acquisition submodule 221, the second acquisition submodule 222 and calculating mould
Block 223.
First acquisition submodule 221 be used for obtain initial time substar initial longitude and initial latitude value.
In the present embodiment, the first acquisition submodule 221 can be used for executing step S121, about the first acquisition submodule 221
Description, please refer to step S121.
Second acquisition submodule 222 is used to obtain the star of satellite according to the initial longitude and the initial latitude
The first operation angle and transported relative to zero degree weft in latitude direction that lower point is run relative to zero degree warp in longitudinal
The second capable operation angle.
In the present embodiment, the second acquisition submodule 222 can be used for executing step S122, about the second acquisition submodule 222
Description, please refer to step S122.
When the computing module 223 is used to calculate current according to first operation angle and second operation angle
Carve substar current longitude and current latitude value.
In the present embodiment, computing module 223 can be used for executing step S123, and the description as described in computing module 223 please refers to
Step S123.
In conclusion current longitude and current latitude of the embodiment of the present application by the substar of calculating current time satellite
Then angle value judges according to current longitude and the object longitude and object latitude value of current latitude value and target object
Whether target object is in the default observation area of current time satellite, to judge whether the moment can observe object
Body, then multiple moment point determinations according to object in the observation area can observe the time range of target object.
In this process, due to only needing to calculate the longitude and latitude of target object Yu each moment substar, so calculation amount is significantly
Reduce, so as to greatly improve the formation efficiency of time window.
In embodiment provided herein, it should be understood that disclosed device and method, it can also be by other
Mode realize.The apparatus embodiments described above are merely exemplary, for example, the flow chart and block diagram in attached drawing are shown
According to device, the architectural framework in the cards of method and computer program product, function of multiple embodiments of the application
And operation.In this regard, each box in flowchart or block diagram can represent one of a module, section or code
Point, a part of the module, section or code includes one or more for implementing the specified logical function executable
Instruction.It should also be noted that function marked in the box can also be attached to be different from some implementations as replacement
The sequence marked in figure occurs.For example, two continuous boxes can actually be basically executed in parallel, they sometimes may be used
To execute in the opposite order, this depends on the function involved.It is also noted that each of block diagram and or flow chart
The combination of box in box and block diagram and or flow chart can be based on the defined function of execution or the dedicated of movement
The system of hardware is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the application can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application shall be subject to the protection scope of the claim.
Claims (10)
1. a kind of time window generating method, which is characterized in that the described method includes:
Obtain the object longitude and object latitude value of target object；
Obtain current longitude of the substar at current time of satellite, current latitude value；
It is current according to the object longitude, the object latitude value, the current longitude and the current latitude value judgement
Whether moment target object is in default observation area；
Determine that satellite in-flight can be right around ground according to multiple moment points of the target object in the default observation area
The time range that target object is observed.
2. time window generating method according to claim 1, which is characterized in that the method also includes,
In-flight the image including target object can be obtained to the time range that target object is observed around ground according to satellite.
3. time window generating method according to claim 1, which is characterized in that the substar for obtaining satellite is being worked as
The step of current longitude at preceding moment, current latitude value includes:
The initial longitude of acquisition initial time substar and initial latitude value；
According to the substar of the initial longitude and the initial latitude acquisition satellite relative to zero degree warp in longitudinal
First operation angle of operation and the second operation angle run relative to zero degree weft in latitude direction；
According to first operation angle and second operation angle calculate current time substar current longitude and
Current latitude value.
4. time window generating method according to claim 3, which is characterized in that it is described according to the initial longitude and
The initial latitude obtains the first operation angle and phase that the substar of satellite is run relative to zero degree warp in longitudinal
The step of the second operation angle run for zero degree weft in latitude direction includes:
Obtain the orbit inclination angle of current time satellite；
Obtain total operation angle of the current time satellite with respect to initial time；
First fortune is calculated according to the initial longitude, the initial latitude, total operation angle and the orbit inclination angle
Row angle and second operation angle.
5. time window generating method according to claim 4, which is characterized in that the method also includes:
The speed of service of satellite is calculated according to the orbit radius of satellite；
The orbital period of satellite is calculated according to the speed of service of satellite and the orbit radius；
It is described obtain current time satellite with respect to initial time total operation angle the step of include:
Total operation angle is calculated according to the orbital period of satellite and at the time of at current time point.
6. time window generating method according to claim 1, which is characterized in that it is described according to the object longitude,
The object latitude value, the current longitude and the current latitude value judge whether current target object is seen default
Survey region in step include:
Judge the difference of longitude of the object longitude and the current longitude whether in the first preset range, the object latitude
Whether the difference of latitude of angle value and the current latitude value is in the second preset range；
If the difference of longitude is in the first preset range and the difference of latitude is in the second preset range, described in current time
Target object is in default observation area.
7. time window generating method according to claim 1-6, which is characterized in that described according to the target
Multiple moment points of the object in the default observation area determine that satellite can in-flight observe target object around ground
Time range the step of are as follows:
Judge whether there is multiple continuous moment points of the target object in default observation area；
If it is present determining that satellite in-flight can be with around ground according to the time between two endpoints of the continuous moment point
The time range that target object is observed.
8. a kind of time window generating means, which is characterized in that described device include: the first acquisition module, second obtain module,
Judgment module and time determining module；
The first acquisition module is used to obtain the object longitude and object latitude value of target object；
The second acquisition module is used to obtain current longitude of the substar at current time of satellite, current latitude value；
The judgment module is used for according to the object longitude, the object latitude value, the current longitude and described works as
Whether preceding latitude value judges current target object in default observation area；
The time determining module is used for multiple moment points according to the target object in the default observation area and determines
Satellite in-flight can be to the time range that target object is observed around ground.
9. time window generating means according to claim 8, which is characterized in that described device further includes control module,
The control module is used to in-flight adopt the time range control image that target object is observed according to satellite around ground
Collect equipment and obtains the image including target object.
10. time window generating means according to claim 9, which is characterized in that described second, which obtains module, includes, the
One acquisition submodule, the second acquisition submodule and computing module；
First acquisition submodule be used for obtain initial time substar initial longitude and initial latitude value；
Second acquisition submodule is used to obtain the substar phase of satellite according to the initial longitude and the initial latitude
The first operation angle run for zero degree warp in longitudinal and run relative to zero degree weft in latitude direction
Two operation angles；
The computing module is used to be calculated under current time star according to first operation angle and second operation angle
The current longitude of point and current latitude value.
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