Plot board for ground surveillance object selection from orbital space vehicle

FIELD: physics, space technology.

SUBSTANCE: plot board for ground surveillance object selection from orbital space vehicle refers to space technology. The plot board for ground surveillance object selection from orbital space vehicle includes flexible tape with the ground map printed on it, and semitransparent plate above the tape. Two halves of the space vehicle's orbit pass are drawn on the plate in such a way that the ascending node in the beginning of the first half of the orbit pass and the descending node in the beginning of the second half of the orbit pass are superimposed. The plot board also comprises a device for the tape map transport along the plate with orbit pass image; the transport device comprising two shafts that are spaced-apart and interconnected in parallel. The map printed on the tape has the equator beginning and ending points superimposed, and the tape is made in the form of a ring and pulled on the shafts so as to move along the map equator line. The distance between the shaft axes and size of the plate with the orbit pass image along the equator direction are equal to (L-d)/2, where L - is the map equator length; d - is absolute distance between passes measures in linear units along the map equator; shaft radius equals to d/(2π). The stated above gives the effect of decreased plot board size.

EFFECT: decreased size of plot board for ground surveillance object selection from orbital space vehicle.

2 dwgg

 

The invention relates to the field of space technology and can be used to identify and select objects on earth observations from aboard orbiting SPACECRAFT), moving in a near-circular orbit.

Known maps of the earth's surface: [1] communalisation map of the mission control Center (MCC) and maps of the sky [2], which can be used to identify and select geophysical and astronomical objects for observations performed with the AC. The lack of maps is that they do not have graphical information about the orbit of the SPACECRAFT.

The closest analogues adopted for the prototype is the tablet to identify and select objects geophysical observations aboard space stations [3], which contains two copies of a map of the earth surface deposited on a flexible tape mounted on the tape with a map of the translucent plate with the image of the spiral orbit from the ascending node and the device providing movement of the tape with the card along the plate with the image of the orbit of the two spaced apart and fastened together in parallel between the shafts, when this card is printed on the tape with the combined end point of the equator the first card and start point of the equator of the second card, and the tape is made of a closed ring and stretched over the shaft, with the possibility of krugalopmednia along the line of the equator cards.

Line shape round orbit specifies the track a SPACECRAFT to map the earth's surface and is determined by the inclination, orbit height and associated period of circulation of the SPACECRAFT around the Earth.

Tablet [3] is presented in figure 1. This tablet is used to MCC for planning geophysical observations from orbiting space stations (Salyut, Mir, international space station).

Working with the tablet as follows. With the help of the device providing movement of the tape with the card along the plate with the image of the spiral orbit connecting point of the ascending node of the orbit round, depicted on the plate, with the point of the equator of the map corresponding to the value of the longitude of the ascending node of the considered orbits orbit. In addition, the line of the route round the orbit shows on a map the route of this loop that allows you to define and select a point of the surface for observation at this stage orbit.

Tablet, taken as the prototype, has a major drawback - its dimensions are defined by the total length of the map the earth's surface, are quite large and can create difficulties during its operational use (for example, aboard manned SPACECRAFT).

The task of the proposed device is improved ergonomic characteristics of the tablet to select the ground object of observation with orbitalnega KA by reducing the size of the tablet.

This object is achieved in that the tablet to select the ground object observations from orbiting spacecraft includes a flexible tape with a map of the earth's surface, installed over her translucent plate with the image of the two halves of the spiral orbit of the spacecraft, made with a combination of ascending node of the orbit starting the first half revolution of the orbit, and the descending node of the orbit starting the second half revolution of the orbit, and the device providing movement of the tape with the card along the plate with the image of the revolution orbit of the two spaced apart and fastened together in parallel between the shafts, when this card is printed on the tape with a combination of the beginning and ending of the equator card and the tape is made of a closed ring and stretched over the shaft with a circular movement along the equator line cards, and the distance between the axes of the shafts and the size of the plate with the image of the spiral orbit along the equator is made equal to a value

(L-d)/2,

where L is the length of the equator of the map; d is the absolute value of the inter-turn distance, measured in linear units along the equator of the card;

and the radius of the shaft is made equal to the value of d/(2π).

In the proposed tablet, unlike tablet-prototype images of the two halves of the loop orbit plotted on a semi-transparent plate separation is about and posted the proposed way (combining began half round), on the tape with the card dealt only one card of the earth surface and placed the suggested way (with a combination of start points and end the equator of the map), and the radius of the shaft and the distance between the axes of the shafts device providing movement of the tape with the card along the plate with the image of the spiral orbit and the size of the plate with the image of the spiral orbit is made equal to the proposed values calculated by the proposed formulas as functions of the length of the equator and turn-to-turn distance.

The tablet is illustrated in figure 1 and 2. Given: figure 1 - tablet-prototype; figure 2 - proposed tablet.

In figure 2, which presents the proposed design of the tablet, introduced the notation:

1 - tape with a map of the earth's surface;

2 is a semi - transparent plate with the image of the spiral orbit;

3 is a curve of the first half of the round orbit;

4 is a curve of the second half of the round orbit;

5 - two parallel bonded rotating shaft;

6 - element design, the fastening axis of the shaft (5);

7 - element design, the locking position of the plate with the image of the spiral orbit over the shaft (5);

8 - equator line card;

9 - projection of the equator card on the plate with the image of a spiral orbit.

Working with the tablet as follows.

The rotation shaft (5) and per meshaut tape from the card (1) relative to the plate (2) to match the point of the earth's equator (8), corresponding to the value of the longitude of the ascending node of the considered orbits orbit, with the point of the ascending node of the orbit round the KA - start point of the curve line (3). In this case the curve line (3) will show on the map (1) the first half of the considered orbits orbit. Next fix the longitude of the point of the earth's equator (8), corresponding to the end of the curve (3). This point is the descending node of the orbit of the SPACECRAFT on the orbit. The rotation shaft (5) move the tape from the card (1) relative to the plate (2) to match the point of the earth's equator (8)corresponding to the fixed value of longitude, with the start point of the curve (4) (starting point of the curves (3) and (4), and point them all the same). In this case the curve (4) will show on the map (1) route the second half of the considered orbits orbit. On the obtained positions of the track loop orbit to map the earth's surface-defined and selectable objects on the earth's surface to perform their observations on a given turn of the orbit.

The device providing movement of the tape with the card along the plate with the image of the spiral orbit is made in the form of two spaced apart and fastened together in parallel between a rotating shaft (5), of the structural element (6), the fastening axis of the shaft (5), and the structural element (7), the locking position of the plate (2) over the shaft (5) (i.e. above the ribbon with the Arta (1)).

The angular turn-to-turn distance associated with the Earth coordinate system is negative and is determined by the formula (see [4], str):

where Δ Ω - the winding precession of the orbit in the inertial coordinate system; T - period of the SPACECRAFT around the Earth; ω - the angular velocity of the rotation of the Earth in inertial space; Re- Equatorial radius of the Earth; R - focal parameter of the orbit; i - inclination orbit; I2=-1082,2·10-6- the ratio of the potential of the gravitational field of the Earth.

Measure in linear units, the length L of the Equatorial scale longitude map [0,2π] and denote by d the absolute value of the inter-turn distance Δλmeasured in linear units along the equator of the map associated with Δλ and L ratio

Then the linear dimension of the half revolution of the orbit, measured in linear units along the equator of the map equal to

This value is equal to the length of the projection of the equator (9) and is the minimum possible value for the size of the plate (2) and the distance between the axes of the shafts (5)to the straight section of the tape with the card (1) affected line (3), (4). Since the minimum length of ribbon with a card (1) is equal to L, then the minimum size of the tablet on polulineinogo shaft (5) should be part of the tape with a map of length d/2. I.e. the radius of each of the shaft R is determined by the ratio:

or

Describe the technical effect of the invention.

The proposed device improves ergonomics of the tablet to select the ground object observations from orbiting SPACECRAFT by reducing the size of the tablet in the direction of the line of the equator card twice on the tablet prototype.

The technical result is achieved due to the separate images of the two halves of the loop orbit to the plate with the image of the orbit, use only one copy of the map and the proposed size of the radius of the shaft and the distance between the axes of the shafts device providing movement of the tape with the card along the plate with the image of the round orbit, and the proposed size of the plate with the image of a spiral orbit.

LITERATURE

1. Votyakov A.A. Theoretical geography-3. Map of a flat earth. - M: Sofia, 2002.

2. Map of the starry sky with the zodiac constellations. - M: DI EM BI, 2004.

3. Map tablet 17K-7988. RSC "Energia".

4. Engineering Handbook of space technology. Publishing house of the USSR, M., 1969.

The tablet to select the ground object observations from orbiting spacecraft, including a flexible tape with a map of the earth on top of the spine, set over her translucent plate with the image of the two halves of the spiral orbit of the spacecraft, made with a combination of ascending node of the orbit starting the first half revolution of the orbit, and the descending node of the orbit starting the second half revolution of the orbit, and the device providing movement of the tape with the card along the plate with the image of the revolution orbit of the two spaced apart and fastened together in parallel between the shafts, when this card is printed on the tape with a combination of start points and end the equator of the map, and the tape is made of a closed ring and stretched over the shaft with a circular movement along the equator line cards, and the distance between the axes of the shafts and the size of the plate with the image of the spiral orbit along the equator is made equal to a value

(L-d)/2,

where L is the length of the equator of the map; d is the absolute value of the inter-turn distance, measured in linear units along the equator card

and the radius of the shaft is made equal to the value of d/(2π).



 

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