Uplink - Revision history

Yash at 20:15, 5 February 2018

2018-02-05T20:15:15Z

Yash at 18:53, 1 February 2018

2018-02-01T18:53:18Z

Yash at 18:53, 1 February 2018

2018-02-01T18:53:01Z

Yash: Created page with "In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to..."

2018-01-24T10:15:52Z

Created page with "In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to..."

New page

In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to a satellite. Basically any signal from the ground to satellite can be known as Uplink. A space link is a communications link between a spacecraft and its associated ground system or between two spacecrafts. A space link protocol is a communications protocol designed to be used over a space link, or in a network that contains one or multiple space links. The basic data flow over a space link is made of Telemetry(TM) and Telecommand (TC) data. Telemetry generally translates to downlink and telecommand to uplink. <br \>
Telecommand can further be divided into two types:
# '''Direct commands for reconfiguration of spacecraft:''' These are commands that state the satellite to operate some pre-coded commands. A few of such commands are:
::* Kill command used to shutdown all systems permanently, done in case of the satellite transmitting out of frequency band
::* Reset command used to reset a particular subsystem or all subsystems back to initial state
::* Sleep command used to temporarily shutdown all electronics on the device, typically done in a few belts in orbit where radiation or other factors could harm satellite functioning
# '''Application specific commands:''' It involves commanding the satellite to start, end or enhance a particular functionality. Also these commands come with some data that can be input to the satellite to enhance a functionality. A few examples:
::* Control data can be uploaded to satellite to improve the stability of the satellite and make the control law of the satellite more effective
::* If high accuracy in time is required, even time is uploaded, since in space, clocks may behave differently
::* Imaging satellites may use tele commands to focus on imaging particular areas or change resolution of imaging
::* Commands to activate or deactivate a particular device
::* Command to change the polarity of the magnetorquers

If you are done reading this page, you can go back to [[Communications Subsystem]]

@@ Line 11: / Line 11: @@
 #* Commands to activate or deactivate a particular device
 #* Command to change the polarity of the magnetorquers
+----
 If you are done reading this page, you can go back to [[Communications Subsystem]]

@@ Line 1: / Line 1: @@
-In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to a satellite. Basically any signal from the ground to satellite can be known as Uplink. A space link is a communications link between a spacecraft and its associated ground system or between two spacecrafts. A space link protocol is a communications protocol designed to be used over a space link, or in a network that contains one or multiple space links. The basic data flow over a space link is made of Telemetry(TM) and Telecommand (TC) data. Telemetry generally translates to downlink and telecommand to uplink. <br \>
+In satellite telecommunication, a downlink is the link from a satellite down to one or more ground stations or receivers, and an uplink is the link from a ground station up to a satellite. Basically any signal from the ground to satellite can be known as Uplink. A space link is a communications link between a spacecraft and its associated ground system or between two spacecrafts. A space link protocol is a communications protocol designed to be used over a space link, or in a network that contains one or multiple space links. The basic data flow over a space link is made of Telemetry(TM) and Telecommand (TC) data. <ref>http://www.esa.int/Our_Activities/Space_Engineering_Technology/Onboard_Computer_and_Data_Handling/Telemetry_Telecommand</ref> Telemetry generally translates to downlink and telecommand to uplink. <br \>
 Telecommand can further be divided into two types:
 # '''Direct commands for reconfiguration of spacecraft:''' These are commands that state the satellite to operate some pre-coded commands. A few of such commands are:
@@ Line 13: / Line 13: @@
 ----
 If you are done reading this page, you can go back to [[Communications Subsystem]]

@@ Line 2: / Line 2: @@
 Telecommand can further be divided into two types:
 # '''Direct commands for reconfiguration of spacecraft:''' These are commands that state the satellite to operate some pre-coded commands. A few of such commands are:
-::* Kill command used to shutdown all systems permanently, done in case of the satellite transmitting out of frequency band
+#* Kill command used to shutdown all systems permanently, done in case of the satellite transmitting out of frequency band
-::* Reset command used to reset a particular subsystem or all subsystems back to initial state
+#* Reset command used to reset a particular subsystem or all subsystems back to initial state
-::* Sleep command used to temporarily shutdown all electronics on the device, typically done in a few belts in orbit where radiation or other factors could harm satellite functioning
+#* Sleep command used to temporarily shutdown all electronics on the device, typically done in a few belts in orbit where radiation or other factors could harm satellite functioning
 # '''Application specific commands:''' It involves commanding the satellite to start, end or enhance a particular functionality. Also these commands come with some data that can be input to the satellite to enhance a functionality. A few examples:
-::* Control data can be uploaded to satellite to improve the stability of the satellite and make the control law of the satellite more effective
+#* Control data can be uploaded to satellite to improve the stability of the satellite and make the control law of the satellite more effective
-::* If high accuracy in time is required, even time is uploaded, since in space, clocks may behave differently
+#* If high accuracy in time is required, even time is uploaded, since in space, clocks may behave differently
-::* Imaging satellites may use tele commands to focus on imaging particular areas or change resolution of imaging
+#* Imaging satellites may use tele commands to focus on imaging particular areas or change resolution of imaging
-::* Commands to activate or deactivate a particular device
+#* Commands to activate or deactivate a particular device
-::* Command to change the polarity of the magnetorquers
+#* Command to change the polarity of the magnetorquers
 If you are done reading this page, you can go back to [[Communications Subsystem]]