CN116975504A - Rapid calculation method for satellite reconnaissance coverage area target - Google Patents
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Abstract
The invention discloses a rapid calculation method for a satellite reconnaissance coverage area target, which comprises the steps of utilizing a satellite maximum radius distance R_SateMaxAngle and a maximum margin maxR to carry out primary screening on a satellite coverage calculation range; secondary screening is carried out on the satellite coverage calculation range by utilizing the angle ZOP, the angle ZOA and the angle POP'; three times of screening are carried out on the satellite coverage calculation range by utilizing the target polygon and the satellite polygon; according to the method, the satellite coverage calculation range is subjected to primary screening, secondary screening and tertiary screening aiming at the large-area regional target, and the satellite coverage calculation range is greatly reduced when the regional target is calculated and analyzed, so that the satellite coverage calculation range has the purpose, and the satellite coverage calculation speed and the satellite coverage calculation precision can be improved under the condition of the regional target discrete point density requirement.
Description
Technical Field
The invention relates to the technical field of satellite reconnaissance target calculation, in particular to a rapid calculation method for a satellite reconnaissance coverage area target.
Background
The satellite reconnaissance coverage analysis is an analysis calculation method commonly used in the field of spatial information analysis, the common analysis method is to scatter boundary points of a regional target into a dense point set, calculate whether satellite reconnaissance can cover the target point set, and for a regional target with a large area, generally refer to a regional target with a longitude or latitude span of more than 10 degrees, a large number of discrete point sets are required to be arranged on the regional target, so that satellite coverage calculation times are increased, and calculation efficiency is affected; on the other hand, if the density of discrete points in the regional target is insufficient, the actual satellite can cover the regional target, but the condition of the regional target cannot be judged, the satellite coverage calculation method of the regional target generally needs a large amount of calculation, if the satellite coverage calculation area is too large, the satellite coverage calculation efficiency is low, and for a system with high real-time requirement, a new method is needed to improve the calculation efficiency and accuracy; how to better determine the boundary point area of the regional target, thereby ensuring that the satellite reconnaissance coverage calculation is only aimed at the range in the regional target boundary point, excluding irrelevant calculation areas, and improving the speed and accuracy of the satellite reconnaissance coverage calculation.
Patent document CN110276043B discloses a regional target access computing method based on boundary point access computation, which refers to regional target boundary points, but does not apply the boundary points to the rapid computation of satellite scout coverage targets.
Disclosure of Invention
The invention aims to provide a rapid calculation method for satellite reconnaissance coverage area targets, which solves the problems that when satellite coverage calculation is performed on large-area targets, the satellite coverage calculation range is large, so that the satellite calculates irrelevant areas, and the speed and the accuracy of satellite coverage area calculation are reduced.
The aim of the invention can be achieved by the following technical scheme: a rapid calculation method for satellite reconnaissance coverage area targets comprises the following steps:
s1, dividing regional target boundary points, determining regional target center points Z and regional target farthest boundary points A, calculating maximum edge distances maxR of the center points Z and the farthest boundary points A, calculating maximum radius distances R_SateMaxAngle of satellite ground coverage, and screening the calculated satellite coverage range once by using the maximum radius distances R_SateMaxAngle and the maximum edge distances maxR of the satellites;
s2, calculating an angle ZOP between a satellite position P and a center point Z and a maximum surrounding angle ZOA between the center point Z and a farthest boundary point A by taking a geocenter O as an origin, wherein the satellite position is an angle POP 'tangential to the surface of the satellite earth, and performing secondary screening on a satellite coverage calculation range by using the angle ZOP, the angle ZOA and the angle POP';
s3, respectively projecting boundary points of the regional target and boundary points of satellite ground coverage to a common plane to obtain a target polygon and a satellite polygon, and screening the satellite coverage calculation range for three times by using the target polygon and the satellite polygon.
Further: the step of obtaining the maximum radius distance R_SateMaxAngle comprises the following steps:
s11, acquiring semi-long axis and inclination angle parameters of a satellite, calculating a satellite remote point radius R_Apogee, and acquiring a satellite remote point position;
s12, calculating an included angle between the satellite remote site position and the earth surface, obtaining a maximum field half angle SateMaxHalfAngle of the satellite,
s13, calculating the maximum radius distance R_SateMaxAngle of the satellite ground coverage according to the maximum view field half angle SateMaxHalfAngle;
SateMaxHalfAngle = acos(R_Earth / R_Apogee)
R_SateMaxAngle = SateMaxHalfAngle * R_Earth
where R_Earth is the Earth radius and R_Apogee is the satellite Apogee radius.
Further: the conditions of the S1 primary screening are as follows:
the ground distance P 'Z_Earth of the satellite's point P 'from the zone's target center point Z,
when P '' Z_Earth > maxR+R_SateMaxAngle, it is determined that the satellite cannot cover the regional target.
Further: the S2 secondary screening conditions are as follows:
when the angle ZOP is less than ZOA plus the POP', judging that the satellite cannot cover the regional target.
Further: in the step S3, the process of three times of screening the satellite coverage calculation range by using the target polygon and the satellite polygon is as follows:
s31, establishing a normal plane B perpendicular to the satellite earth center vertical line;
s32, projecting boundary points of the regional target to a coordinate system of a normal plane planB to obtain a target polygon;
s33, converting boundary points of the satellite ground coverage range into a coordinate system of a normal plane planB to obtain a satellite polygon;
s34, three times of screening are carried out on the satellite coverage calculation range by utilizing the target polygon and the satellite polygon.
Further: the step of projecting the boundary point of the area target to the coordinate system of the plane b in S32 to obtain the target polygon further includes:
s321, adopting a J2000 coordinate system as a boundary point of the regional target;
s322, establishing a conversion matrix Mat1 of the J2000 coordinate system and the coordinate system of the normal plane B,
s323 converting the boundary Point1 of the region object into the coordinate system Point2 of the normal plane b,
then Point2 = Point1；
Wherein Mat1 is a transformation matrix of the J2000 coordinate system to the coordinate system of the normal plane B.
The invention has the beneficial effects that:
1. according to the method, the satellite coverage calculation range is subjected to primary screening, secondary screening and tertiary screening aiming at a large-area regional target, the satellite coverage calculation range is greatly reduced when the regional target is calculated and analyzed, and the operation speed is improved by layered screening, so that the satellite coverage calculation range has the purpose, and the satellite coverage calculation speed and the satellite coverage calculation precision can be improved under the condition of the regional target discrete point density requirement.
2. According to the invention, through a hierarchical optimization physical visible three-level screening algorithm, invisible satellite time periods are screened out, irrelevant satellite coverage calculation ranges are eliminated, high-frequency calling coordinate conversion can be avoided, the operation speed is high, satellite load coverage only considers projection points intersected with the earth, and whether the satellite load coverage is visible or not is judged in a geometric mode, so that the long calculation time caused by calculating north-south extreme crossing and overlarge regional targets can be avoided, and the algorithm efficiency can be improved to a greater extent.
3. The method and the device can define the satellite coverage calculation range by utilizing the maximum margin maxR from the central point Z of the regional target through one-time screening, can cover the whole regional target with the satellite coverage calculation range without missing the regional target calculation region, and ensure the reliability of satellite coverage calculation of the regional target.
4. The secondary screening adopts the maximum surrounding angle ZOA of the center point Z and the farthest boundary point A, and the satellite coverage calculation range is further confirmed by judging the direct intersection relation between the ZOA and the POP', so that the regional target range obtained by the primary screening can be further corrected, and the reliability of the satellite coverage calculation of the regional target is further ensured.
5. The three-time screening method adopts the projection of the boundary point of the regional target to the sitting target polygon of the plane B, the boundary point of the satellite ground coverage area is converted to the coordinate system of the plane B to obtain the satellite polygon, and the three-time screening is carried out on the satellite coverage calculation range by calculating the intersection of the target polygon and the satellite polygon, so that the regional target range can be further corrected, and the reliability of the satellite coverage calculation of the regional target is further ensured.
Drawings
FIG. 1 is a schematic view of the projection conversion of the primary screening area target and satellite load field of view according to the present invention;
FIG. 2 is a schematic view of the projection conversion of the secondary screening area target and satellite loading field of view according to the present invention;
FIG. 3 is a schematic view of three filtered field of view projection conversion of an area target and satellite loading in accordance with the present invention;
FIG. 4 is a second view of the three-pass filtered field of view projection conversion of the present invention;
FIG. 5 is a schematic diagram of the satellite loading range versus earth position according to the present invention;
fig. 6 is a view showing the effect of the ground projection of the 20-degree angle of view of the present invention at near and far locations.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar symbols indicate like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1-6, the invention discloses a rapid calculation method for satellite reconnaissance coverage area targets, which comprises the following steps:
s1, dividing regional target boundary points, determining regional target center points Z and regional target farthest boundary points A, calculating maximum edge distances maxR of the center points Z and the farthest boundary points A, calculating maximum radius distances R_SateMaxAngle of satellite ground coverage, and screening the calculated satellite coverage range once by using the maximum radius distances R_SateMaxAngle and the maximum edge distances maxR of the satellites;
s2, calculating an angle ZOP between a satellite position P and a center point Z and a maximum surrounding angle ZOA between the center point Z and a farthest boundary point A by taking a geocenter O as an origin, wherein the satellite position is an angle POP 'tangential to the surface of the satellite earth, and performing secondary screening on a satellite coverage calculation range by using the angle ZOP, the angle ZOA and the angle POP';
s3, respectively projecting boundary points of the regional target and boundary points of satellite ground coverage to a common plane to obtain a target polygon and a satellite polygon, and screening the satellite coverage calculation range for three times by using the target polygon and the satellite polygon.
As shown in fig. 1, the invention aims at a large-area regional target, the regional target is arranged along the curved surface of the earth and tends to have an irregular shape, the central point Z can adopt the area central point of the regional target, the maximum margin maxR of the central point Z and the furthest boundary point A is calculated, the circumferential range formed by the central point Z and the maximum margin maxR can cover all the regional targets, the omission of the calculation region of the regional target can not occur, and the reliability of satellite coverage calculation of the regional target is ensured.
As shown in fig. 6, when the satellite runs at the remote point radius r_apogee by using the maximum radius distance r_satemaxangle of the satellite, the area of the load coverage of the satellite is the largest and is larger than that of the load coverage of the satellite at any point of the orbit; when the satellite is operated at a remote point radius R_Apogee, solving a satellite maximum radius distance R_SateMaxAngle;
firstly, acquiring semi-long axis and inclination angle parameters of a satellite, calculating a satellite remote point radius R_Apogee, and acquiring a satellite remote point position;
then, calculating an included angle between the satellite remote site position and the earth surface, and obtaining a maximum view field half angle SateMaxHalfAngle of the satellite, as shown in a figure 1, wherein OP is a radius R_Apogee of the satellite at the remote site, and D' are projection points of a maximum boundary covered by the satellite at the earth;
specifically, as shown in fig. 1, the maximum half angle of field, satemaxhafangle=acos (r_earth/r_apogee), where r_earth is the Earth radius and r_apogee is the satellite Apogee radius, and the maximum half angle of field, satemaxhafangle, is expressed by adopting an angle of radian.
Calculating the maximum radius distance R_SateMaxAngle of the satellite in the satellite ground coverage;
R_SateMaxAngle = SateMaxHalfAngle * R_Earth。
the ground distance P 'Z_Earth of the satellite's point P 'from the zone's target center point Z,
when P '' Z_Earth > maxR+R_SateMaxAngle, it is determined that the satellite cannot cover the regional target.
The method performs primary screening on the satellite coverage calculation range, and considers the satellite maximum radius distance R_SateMaxAngle of the satellite and the maximum margin maxR of the regional target when the satellite remote point radius R_Apogee is considered, so that the reliability of the satellite coverage calculation of the regional target is ensured, but the covered satellite coverage calculation region is still larger, and secondary screening is needed.
Secondary screening as shown in fig. 2, the satellite coverage calculation region is subjected to secondary screening by adopting angle discrimination,
determining an angle ZOP of a satellite position P and a central point Z by taking a geocenter O as an origin, wherein the satellite position P is an angle POP ' of a tangent P ' of the satellite position P and the earth surface of the satellite, the central point Z and a furthest boundary point A maximally enclose an angle ZOA, and performing secondary screening on the satellite coverage calculation range by utilizing the angle ZOP, the angle ZOA and the angle POP ';
when the angle ZOP > ZOA+ POP 'is not covered by the satellite, no intersection exists between the visible coverage area of the satellite and the regional target, the intersection-free areas can be eliminated during satellite coverage calculation, the speed of satellite coverage calculation is improved, the satellite coverage calculation range is further confirmed through secondary screening through judging the intersection relationship between the angle ZOA and the angle POP', the satellite coverage calculation range is reduced, the reliability of satellite coverage calculation of the regional target can be guaranteed, the calculation range of the regional target cannot be omitted, the regional target range obtained through primary screening can be further corrected, and the reliability of satellite coverage calculation of the regional target is further guaranteed.
In order to further limit the range of satellite coverage calculation of the regional target, three times of screening adopt intersection calculation of the target polygon and the satellite polygon to finally determine the range of satellite coverage calculation required by the regional target.
As shown in fig. 5, the positional relationship between the loading field of view range of the satellite and the earth generally includes the conditions of full intersection, non-intersection, earth inclusion and partial intersection, and when calculating satellite coverage, the point set under the J2000 coordinate system of the loading field of view range intersecting with the earth is calculated without calculating the field of view boundary points outside the earth.
As shown in fig. 3 and 4, the boundary point of the regional target and the boundary point of the satellite ground coverage are respectively projected to a common plane to obtain a target polygon and a satellite polygon, and the range of satellite coverage calculation is screened three times by using the target polygon and the satellite polygon.
In particular, as shown in FIG. 4First, a normal plane planB perpendicular to the satellite earth center vertical line is established, and the Z axis of the normal plane planB is shown: can be usedA direction; x axis:×(++ (1, 1)); y axis:×the method comprises the steps of carrying out a first treatment on the surface of the The satellite polygon can be obtained by converting the boundary point of the satellite ground coverage range into the coordinate system of the normal plane planB, the boundary point of the regional target is projected to the coordinate system of the normal plane planB to obtain the target polygon, and the intersection relationship of the target polygon and the satellite polygon is utilized to screen the satellite coverage calculation range for three times.
The process of projecting the boundary points of the area target to the coordinate system of the normal plane b to obtain the target polygon may be adopted, as shown in fig. 4, and a J2000 coordinate system is adopted for the boundary points of the area target; firstly, a conversion matrix Mat1 of a J2000 coordinate system and a coordinate system of a normal plane planB is established, and a boundary Point Point1 of an area target is converted into the coordinate system of the normal plane planB by utilizing the conversion matrix Mat1 to become Point2, and Point 2=Point 1The method comprises the steps of carrying out a first treatment on the surface of the And realizing the rapid projection of the boundary point of the regional target to the coordinate system of the normal plane planB.
And performing intersection calculation on the projected target polygon and the satellite polygon, if the target polygon and the satellite polygon are not intersected, the satellite coverage range and the area target are not intersected, the areas can be removed, the satellite coverage calculation range is further reduced, meanwhile, the reliability of the satellite coverage calculation of the area target can be ensured, the calculation range of the area target cannot be omitted, the area target range obtained by secondary screening can be further corrected, and the reliability of the satellite coverage calculation of the area target is further ensured.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. A rapid calculation method for satellite reconnaissance coverage area targets is characterized by comprising the following steps: the method comprises the following steps:
s1, dividing regional target boundary points, determining regional target center points Z and regional target farthest boundary points A, calculating maximum edge distances maxR of the center points Z and the farthest boundary points A, calculating maximum radius distances R_SateMaxAngle of satellite ground coverage, and screening the calculated satellite coverage range once by using the maximum radius distances R_SateMaxAngle and the maximum edge distances maxR of the satellites;
s2, calculating an angle ZOP between a satellite position P and a center point Z and a maximum surrounding angle ZOA between the center point Z and a farthest boundary point A by taking a geocenter O as an origin, wherein the satellite position is an angle POP 'tangential to the surface of the satellite earth, and performing secondary screening on a satellite coverage calculation range by using the angle ZOP, the angle ZOA and the angle POP';
s3, respectively projecting boundary points of the regional target and boundary points of satellite ground coverage to a common plane to obtain a target polygon and a satellite polygon, and screening the satellite coverage calculation range for three times by using the target polygon and the satellite polygon.
2. A fast computing method for satellite reconnaissance coverage area targets as claimed in claim 1, wherein: the step of obtaining the maximum radius distance R_SateMaxAngle comprises the following steps:
s11, acquiring semi-long axis and inclination angle parameters of a satellite, calculating a satellite remote point radius R_Apogee, and acquiring a satellite remote point position;
s12, calculating an included angle between the satellite remote site position and the earth surface, obtaining a maximum field half angle SateMaxHalfAngle of the satellite,
s13, calculating the maximum radius distance R_SateMaxAngle of the satellite ground coverage according to the maximum view field half angle SateMaxHalfAngle;
SateMaxHalfAngle = acos(R_Earth / R_Apogee)
R_SateMaxAngle = SateMaxHalfAngle * R_Earth
where R_Earth is the Earth radius and R_Apogee is the satellite Apogee radius.
3. A fast computing method for satellite reconnaissance coverage area targets as claimed in claim 2, wherein: the conditions of the S1 primary screening are as follows:
the ground distance between the satellite lower point P 'and the regional target center point Z is P' Z_Earth,
when P '' Z_Earth > maxR+R_SateMaxAngle, it is determined that the satellite cannot cover the regional target.
4. A fast computing method for satellite reconnaissance coverage area targets as claimed in claim 1, wherein: the S2 secondary screening conditions are as follows:
when the angle ZOP is less than ZOA plus the POP', judging that the satellite cannot cover the regional target.
5. A fast computing method for satellite reconnaissance coverage area targets as claimed in claim 1, wherein: in the step S3, the process of three times of screening the satellite coverage calculation range by using the target polygon and the satellite polygon is as follows:
s31, establishing a normal plane B perpendicular to the satellite earth center vertical line;
s32, projecting boundary points of the regional target to a coordinate system of a normal plane planB to obtain a target polygon;
s33, converting boundary points of the satellite ground coverage range into a coordinate system of a normal plane planB to obtain a satellite polygon;
s34, three times of screening are carried out on the satellite coverage calculation range by utilizing the target polygon and the satellite polygon.
6. The method for rapid computation of satellite reconnaissance coverage area targets of claim 5, wherein: the step of projecting the boundary point of the area target to the coordinate system of the plane b in S32 to obtain the target polygon further includes:
s321, adopting a J2000 coordinate system as a boundary point of the regional target;
s322, establishing a conversion matrix Mat1 of the J2000 coordinate system and the coordinate system of the normal plane B,
s323 converting the boundary Point1 of the region object into the coordinate system Point2 of the normal plane b,
then Point2 = Point1；
Wherein Mat1 is a transformation matrix of the J2000 coordinate system to the coordinate system of the normal plane B.
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