Method of forming navigational satellite system

FIELD: space engineering; forming satellite systems for positioning objects on earth surface.

SUBSTANCE: proposed method includes injection of N artificial satellites into circular or other orbits which work in "n" planes (where "n" is integer which is more than 2) by mi (i=1, ...n) satellites (where n is integer) in each plane. Satellites are positioned in orbits of datum plane and in planes located symmetrically and in pairs relative to datum plane. These planes of orbits are positioned irregularly along terrestrial equator relative to datum plane at angles a priori not equal to 360°/n. Artificial earth satellites in orbits are positioned irregularly and symmetrically in pairs relative to base satellite.

EFFECT: reduced number of artificial earth satellites in navigational system with no impairment of system parameters at positioning of ground objects.

1 dwg, 1 tbl

 

The invention relates to space technology and can be used to create satellite positioning systems of objects on the earth's surface.

There is a method of earth observation from space, including the removal of artificial satellites on multiple geosynchronous orbit with an inclination of

where m, n are respectively the number of draconic orbital period of each of the satellites and the effective periods of the Earth's rotation in one period of the frequency of occurrence of the track of the satellite, receiving on Board images of ground objects in the bands review, proportional width (180°/m).

The known method provides besprovodnoy overview of the Earth's surface reduced the required number of satellites for a given width of the swath.

The disadvantage of this method is the relatively large required bandwidth of the review, which can be reduced while maintaining the other advantages of the method in a special position of satellites in orbits (USSR Author's certificate N297930, CL 64G 1/10, 1988.).

There is also known a method of earth observation from space, including the removal of artificial satellites on multiple geosynchronous orbit with an inclination of

where m, n are respectively the number of draconic the ski periods of treatment each of the satellites and the effective periods of the Earth's rotation in one period of the frequency of occurrence of the track of the satellite, getting on Board images of ground objects in the bands review, proportional width (180°/m), characterized in that, in order to reduce in proportion to the total number N of satellites required for each swath, while ensuring bezrobotnego mode observations of the Earth's surface, satellites make it to orbit, characterized by the simultaneous passage of the equator all satellites at distances from each other equal to

180°/(mN) if N 2K, 360°/(mN) when N2K+1,

where K is a natural number (see EN 2058917, CL 64G 1/10, 1996).

Known systems the position of the satellites in orbits for positioning objects on earth (US 6727850, G01S 5/14, 27.04.2004, CA 2439014, B60R 11/02, 11.03.2004, WO 200431909, G06F, 15.04.2004, TW 539865, G01S 1/00, 2003).

The closest in technical essence to the proposed method is a method of constructing an orbital system Galileo (European system), which carry out the launch of artificial satellites in three orbital planes with 10 satellites in each plane - 9 satellites are active and 1 is back. Active satellites are placed in 40 degrees in its orbit, while the backup data can be located anywhere on this orbit. When this orbital planes are spaced evenly along the equator (over 120 degrees). (Reasonable YU. inches orbital structures satellite systems periodic review M., Ed. Bauman, 2000, 104 S.).

The disadvantages of the above technical solutions is the necessity to have on the orbits of a significant number of artificial Earth satellites (AES).

The technical result of the proposed invention is to reduce the number of artificial satellites without degradation of the positioning system ground objects.

For this purpose, we propose a method orbital build navigation satellite system, which consists in introducing to a circular or other orbits of the N satellites, working in n dimensions (where n is an integer more than 2) for mii=1, ... n satellites (where n is an integer) in each plane, characterized in that the artificial Earth satellites have orbits on the reference plane and the planes which are symmetrical in pairs relative to the base plane, the plane of the orbits of artificial Earth satellites have relative to the base plane through the corners, not a priori equal to 360°/n, and artificial Earth satellites in orbits in planes have unevenly symmetrical in pairs relative to the base of an artificial Earth satellite.

Explain the features of the method of constructing a global navigation system.

Modern systems are mainly based on the rule (method) kinematically PRA is safe systems when in the initial moment of time satellites are located at the vertices of some symmetric lattice - GLONASS, Galileo. Theoretically, increasing the number of satellites characteristics of such a system should be improved, but there are examples where increasing the number of satellites, 0,0, From 11 to 12, 14 to 15 and 20 to 21 characteristics deteriorate. Thus, optimization of the orbital construction, produced in a limited variety within the selected class of structures does not lead to the optimization of building systems.

The claimed method of constructing a navigation system based on the ideas of differential calculus and mathematical programming, consisting in the sequential setting increments initial position of one or more satellite systems, to ultimately provide the best indicators of the quality of functioning of the system.

From theory it is known that to ensure ballistic stability of the orbits of all the satellites of the system should be of equal height and equal inclination. Otherwise, due to the influence of decentralist the Earth's gravitational field plane of the orbits will be precessional along the equator at different speeds. This will cause relative angular positions of the planes of the orbits will be constantly changing, and the system does not moreviolent target.

According to the proposed method is proposed to withdraw artificial satellite into orbit, located in planes spaced from the base plane at angles not equal to 360°/n, and symmetric (for example, when three planes two planes distant from the reference plane at equal angles not equal to 120°unlike system Galileo, where satellites are located in planes spaced from one another by 120°i.e. the plane evenly distributed). The claimed method involves not uniform along the Earth's equator the location of the planes of the orbits, and pairwise symmetric. To achieve target positioning terrestrial objects with uneven arrangement of the planes of the orbits of the location of the satellites within each plane of the orbits must also be uneven. According to the claimed method it is suggested to place satellites in pairs-symmetrically relative to the base satellite. To clarify terms such as "reference plane" and "core satellite" need to make a terminological clarification.

The reference plane is arbitrarily located the plane of the orbit of the satellite, relative to which are other planes of the orbits are pairwise-symmetric. If the number of planes of the orbits n is even, then the reference plane is virtual, i.e. a plane that does not contain a single satellite and servants of Asa center of symmetry for the other pairs of planes of the orbits.

Basic satellite - one of the satellites in orbit, relative to the other satellites of the satellite at the initial time is pairwise-symmetric. Basic satellite can be virtual, that represent some point in the orbital plane, which moves in an orbit like all satellite systems relative to other satellites in the initial moment of time are pairwise-symmetric. Basic satellite necessarily virtual, if the Central plane is virtual, i.e. if the number of planes of the orbits even. In addition, the satellite can be virtual, if the number of satellites in the plane even.

Figure 1 shows the location accordingly satellites in orbits in three dimensions. Method optimization orbital build a global satellite systems (mathematical apparatus) described in the magazine "Flight" No. 12, 2001, p.20-26.

The table below shows comparative data system Galileo and system according to the claimed method.

Table
NameFull-time optionNew option
The number of satellites3028
The number of launches of carrier rockets6 5
The number of planes of the orbits33
The number of satellites in the plane of the orbit10+10+1010+10+8
The number of redundant satellites in the plane1+1+11+1+1
The cost of creating the system100%93,33%
Relative accuracy characteristics100%96-97%
The relative reliability of the system100%109,5%

As the results of the research system in the claimed method requires less financial cost, more reliable and provides a specified level of quality (i.e. better than the known system the rate of price and quality).

The way orbital build navigation satellite system, which consists in introducing to a circular or other orbits of the N satellites, working in n dimensions (where n is an integer more than 2) for mii=1/... n satellites (where n is an integer) in each plane, characterized in that the artificial Earth satellites have orbits on the reference plane and the planes which are symmetrical in pairs relative to the base plane, the plane of the orbits of artificial JV is tikov Earth have unevenly along the equator of the Earth relative to the reference plane through the corners, a priori is not equal to 360°/n, and artificial Earth satellites in orbits in planes have unevenly symmetrical in pairs relative to the base of an artificial Earth satellite.



 

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