Differences

This shows you the differences between two versions of the page.

--- en:sim_earth [2017/12/03 17:28]
writer
+++ en:sim_earth [2018/01/26 18:33]
ashley
@@ Line 1: / Line 1: @@
 **Earth Simulator**
-The Earth's simulator is an Earth globe providing:
+The Earth's simulator is an Earth globe that provides:
-   *geometrically - scaled appearance of the Earth (with a diameter of 130 cm) visible from the satellite board.
+   *a geometrically-scaled appearance of the Earth (with a diameter of 130 cm) visible from the satellite board;
-   *the kinematics of the satellite's motion on the sub-satellite track along the equatorial orbit - either in real time, or using reasonable scaling (acceleration, deceleration of time) conditions for shooting of certain surface sectors are the same in the same terms as shooting real earth's surface by Earth remote probing satellites (time, orbital parameters, coordinates of the point, coordinates of the region);
+   *the kinematics of the satellite's motion on the sub-satellite track along the equatorial orbit, either in real time or using reasonable scaling (acceleration, deceleration of time) conditions for surveying certain surface areas. The kinematics are the same as shooting the actual earth's surface by remote sensing satellites (time, orbital parameters, coordinates of the point, coordinates of the region);
-   *conditions for communication with the "ground" (ground telemetry stations - GTSs) via a telemetry and telecommand radio link. When the ground station is in zone of geometric radio visibility of the board - the LEDs of the corresponding "ground station" are switched on;
+   *the conditions for communication with the "ground" (ground telemetry stations - GTSs) via a telemetry and telecommand radio link. When the ground station is in zone of geometric radio visibility of the board, the LEDs of the corresponding "ground station" are switched on;
-   *conditions for transferring data "to the ground" via a high-speed communication channel when a ground station is in zone of geometric radio visibility of the spacecraft.
+   *the conditions for transferring data "to the ground" via a high-speed communication channel when a ground station is in zone of geometric radio visibility of the spacecraft.
-The satellite "flies in a near-earth orbit" and in fact it [[pendant|hangs on a thread]] in a simulated "geomagnetic" field (inside the current frame) and rotates in a horizontal plane - either freely, or under the action of an on-board control system programmed by user - at that time as the Earth globe in front of it rotates, simulating the movement of the spacecraft along the equatorial orbit.
+The satellite "travels in a near-earth orbit," and in fact [[pendant|hangs on a thread]] in a simulated "geomagnetic" field (inside the current frame) and rotates in a horizontal plane - either freely or under the action of an on-board control system programmed by user - at the same time as the Earth globe in front of it rotates, thus simulating the movement of the spacecraft along the equatorial orbit. The part of the globe's surface near the globe's equator that is required for taking photos eventually appears in front of the suspended device. The task of the satellite control system is to orient and stabilize the satellite on the thread by this time, direct the camera's field of view with the necessary accuracy to the area of interest, take photos, and transmit the data to the user "on Earth" by orienting the laser pointer to the required "ground" receiving station.
-The part of the globe's surface near the globe equator required for taking photos eventually appears in front of the hung device. And the task of the satellite control system is to orient and stabilize the satellite on the thread by this time directing the camera's field of view with the necessary accuracy to the area of interest, to take photos and to transmit data "to Earth" to the user accompanying this possibility by orienting the laser pointer to the required "ground" receiving station.
-The Globe is controlled via PC USB port. PC tasks include controlling the rotation of the globe, the network of "terrestrial" (on the globe's surface) telemetry stations (GTSs) and "surface" centers for receiving high-speed information. These centers are located on the surface of the "Earth" in previously known, fixed and unchanging in time geographical points.
+The Globe is controlled via the PC USB port. The PC tasks include controlling the rotation of the globe, the network of GTSs (on the globe's surface), and "surface" centers for receiving high-speed information. These centers are located on the surface of the "Earth" in previously known, fixed, and unchanging geographical points in time.
-The conditions for communication with the "Earth" via telemetry and telecommand radio link are simulated by calculating when a particular GTS on the surface of the globe is in zone of geometric radio visibility with a board on the thread and issuing the appropriate command to turn on and off the radio receiver of this ground station. After switching on, the ground station is by default in the receive data ([[uhf_tx_subsys|telemetry]]) mode.
+The conditions for communication with the "Earth" via the telemetry and telecommand radio link are simulated by calculating when a particular GTS on the surface of the globe is in the zone of geometric radio visibility as the board suspended from the thread, and then issuing the appropriate command to turn on and off the radio receiver of this ground station. After switching on, the ground station is by default in the receive data ([[uhf_tx_subsys|telemetry]]) mode.
-The conditions for transferring data from the spacecraft to the Earth (a photodetector on the surface of the globe) via a high-speed communication channel are simulated by using a laser pointer illumination and holding a pointer of a given marker on the surface of a rotating globe. The fact that the photodiode is illuminated on the surface of the globe for a predetermined time interval is a sign of the normal orientation of the "board" to the "Earth", after which the data from the board are transmitted via the usual Wi-Fi channel all the time while  [[hf_tx_subsys|laser source]] highlights the required marker.
+The conditions for transferring data from the spacecraft to the Earth (a photodetector on the surface of the globe) via a "high-speed communication channel" (in our case, Wi-Fi) are simulated by using a photodiode illumination on the transmitter while maintaining connection with a given area on the surface of the rotating globe (receiver). The fact that the photodiode is illuminated on the surface of the globe for a predetermined time interval is a sign of the normal orientation of the "board" to the "Earth", after which the data from the board are transmitted via the usual Wi-Fi channel all the time while the [[hf_tx_subsys|transmitter]] highlights the required marker.
 {{ru:earth_model.png?200 |}}

Конструктор спутника "ОрбиКрафт"

User Tools

Site Tools

Differences

Page Tools