ISRO General News and Updates

[indiatester]

Missed the launch today. Was in a meeting I could not avoid (set it myself so....).
Video links please....

 

[Neeraj Mathur]

Missed the launch today. Was in a meeting I could not avoid (set it myself so....).
Video links please....

here you go
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[indiatester]

here you go
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Thanks man. Much appreciated.
Launch was perfect, but as usual coverage was pedestrian.
The Hindi commentator was horrible. May be ISRO should disband this team altogether and let us hear either silence or the update announcements.

 

[sorcerer]

Thanks man. Much appreciated.
Launch was perfect, but as usual coverage was pedestrian.
The Hindi commentator was horrible. May be ISRO should disband this team altogether and let us hear either silence or the update announcements.

Command center chatter will do..thats something awesome to hear.

 

[Skdas]

This sat is mainly for use by the IAF, that's why. So now we have an AWACS in space too!!

I heard the sat will be used to linkup AWACS and other air force assets

This satellite will gives the IAF to dedicate multiple real-time uplink/downlink for all its airborne and static assests. The dream of "One Targets, Other Shoots" is going to be reality soon. Once the birds are updated, everyone will have unified air picture with multiple nodes updating the with there own sensor suits.

Hopefully in future, there could be a possibility of a kill chain comprising of an AWACS locating a bogey, passing on its info to the nearest SU30 MKI. All done without a squek on the radios.

 

[Advaidhya Tiwari]

The problem with communication with GSAT 7A is that it is located in Geosynchronous Orbit which is 36000km from Earth's surface. So, the signal to go to the satellite and then come back, 0.35 seconds is needed (0.22 seconds is travel time and 0.13 seconds is reception, retransmission and processing time). This can cause significant degradation in the responsiveness of systems which work in very high speed environment.

Radars typically work in the precision of 1microsecond whereas the response time of 350 milliseconds can be harmful. The radars can't be fully integrated by GEO satellites but can be only partially integrated. Where general division of resources are needed, where the speed factor is not important, only in those areas these satellites can help.

In case of drones, the delay of 0.35 seconds can result in misfiring of missiles. So, the satellite link can be used only for monitoring the "autopilot" mode of the drones and not fully control the drones. The drones will need to have its own Fly-By-Wire and auto-firing mechanism based on inputs from satellites for them to work.

Overall, the GSAT-7A does enhance the operationality of Indian radars and air based assets but is not the ultimate solution that can control everything with precision.

 

[Skdas]

In case of drones, the delay of 0.35 seconds can result in misfiring of missiles. So, the satellite link can be used only for monitoring the "autopilot" mode of the drones and not fully control the drones. The drones will need to have its own Fly-By-Wire and auto-firing mechanism based on inputs from satellites for them to work.

True, the drones will still need waypoint navigation for its flight plan. The sat comm link will "update" the waypoints to modify the flight plan. A high speed uplink channel from the drone will be dedicated for the EO sensor suit data. The human operator can choose a target and instruct the drone to fire upon it. All the necessary fire solution calculations will be done onboard the drone to utilising the real-time information. Latter the EO sensor data would help in damage assessment by the human operator.

 

[cobra commando]

Chandrayaan-2 on track, 32 missions next year: ISRO

 

[Indx TechStyle]

Dec 20, 2018
The first orbit raising manoeuver of GSAT-7A satellite has been successfully carried out today (20th December) by firing the Liquid Apogee Motor (LAM) engine of the satellite at 0916 Hrs IST for a duration of 3895 seconds.

 

[rishivashista13]

The problem with communication with GSAT 7A is that it is located in Geosynchronous Orbit which is 36000km from Earth's surface. So, the signal to go to the satellite and then come back, 0.35 seconds is needed (0.22 seconds is travel time and 0.13 seconds is reception, retransmission and processing time). This can cause significant degradation in the responsiveness of systems which work in very high speed environment.

Radars typically work in the precision of 1microsecond whereas the response time of 350 milliseconds can be harmful. The radars can't be fully integrated by GEO satellites but can be only partially integrated. Where general division of resources are needed, where the speed factor is not important, only in those areas these satellites can help.

In case of drones, the delay of 0.35 seconds can result in misfiring of missiles. So, the satellite link can be used only for monitoring the "autopilot" mode of the drones and not fully control the drones. The drones will need to have its own Fly-By-Wire and auto-firing mechanism based on inputs from satellites for them to work.

Overall, the GSAT-7A does enhance the operationality of Indian radars and air based assets but is not the ultimate solution that can control everything with precision.

If this is the case..... Then what's the solution?? Satellite in LEO can't be used for this purpose and any satellite placed in GEO will take such time to process...

Sent from my Redmi 4A using Tapatalk

 

[happylion]

The first orbit raising manoeuver of #GSAT7A satellite has been successfully carried out today by firing the Liquid Apogee Motor engine for a duration of 3895 seconds.

 

[Advaidhya Tiwari]

If this is the case..... Then what's the solution?? Satellite in LEO can't be used for this purpose and any satellite placed in GEO will take such time to process...

Sent from my Redmi 4A using Tapatalk

Drones are best operated by military communication towers with direct line of sight or radio communication like mobile phones

 

[Chinmoy]

GSLV-F11 Lift-off and Onboard Camera View

https://www.isro.gov.in/gslv-f11-gsat-7a-mission/gslv-f11-lift-and-onboard-camera-view

 

[Chinmoy]

If this is the case..... Then what's the solution?? Satellite in LEO can't be used for this purpose and any satellite placed in GEO will take such time to process...

Sent from my Redmi 4A using Tapatalk

Had you ever powered on a radio set in vintage days?

Now a days there is always the RJ chattering non stop on FM channels. But have you ever switched on your radio set and tuned into Vividh Bharti to hear the nostalgic voice of Ameen Sayani? Well if you have done that, you might have noticed that before the program starts we could hear static noise on the channel. No what is that?

In satellite communication the connection establishment in between ground transceiver and satellite is always present. You could compare it with a cable connection for internet provided to your home. With GSAT series we are simply increasing the bandwidth for data transfer. With a high throughput the amount of data transmit and receive does increase exponentially which increases the work efficiency.

Example being some remote sessions which we take in PCs. In a slow internet connection the page load up itself take awfully more time. But the same remote session works fine with high bandwidth throughput. Same way, the amount of data transmission in between different air asset would increase manyfold which would mean more realtime information gathering and sharing. Same goes with drones.

 

[Indx TechStyle]

ISRO Says Placing Heavier Satellites Aboard GSLVs Next Challenge

 

[Indx TechStyle]

Year of many new beginnings for Indian space sector

"There will be two IDRSS satellites of which one is targeted to be flown next year," Sivan said.

The IDRSS satellites will be placed in geostationary orbit, enabling satellite to satellite communication is crucial for a manned space mission as there cannot be a risk of being without a without a connection and data relay.

IDRSS = Indian Data Relay Satellite System

Somanath said in 2019, about eight PSLV, two GSLV Mk II and two GSLV Mk III, two SSLV and one test GSLV Mk III for Gaganyaan project will be flown.

14 orbital launches means close to Russia & only behind US & China.

 

[Indx TechStyle]

So,
2019

PSLV C44/EMISat with new tech of utilizing used stage
PSLV C45/RISAT-2B
PSLV C46/CartSat-3, Nemo AM
PSLV C47/RISAT 2BR1
PSLV C48/SPADEX (SPAce Docking EXperiment) vital for space station things
PSLV C49/IRNSS 1J
PSLV C50/IDRSS-1 Communication system for IHSP
PSLV C51/IDRSS-2

GSLV Mk2 F12/GISAT-1 GEO series versions of CartoSats
GSLV Mk2 F13/GSAT-32

GSLV MkIII M01/Chandrayaan-2
GSLG MkIII M02/Unmanned Crew Module

SSLV D1/??
SSLV D2/??

 

[Indx TechStyle]

Dec 24, 2018

After the launch of GSAT-7A on December 19, 2018, four orbit maneuvering operations have been performed successfully on GSAT-7A satellite using onboard Propulsion system. At present, the satellite is placed in an orbit with a perigee (nearest point to earth) of 35,800 km and Apogee (nearest point to earth) of 36,092 km with 0.2 deg inclination which is very close to the its final orbit.

https://www.isro.gov.in/update/24-dec-2018/latest-update-gsat-7a

 

[Chinmoy]

Dec 24, 2018

https://www.isro.gov.in/update/24-dec-2018/latest-update-gsat-7a

Unbelievable mistake done by ISRO. :biggrin2::biggrin2::biggrin2:

 

[Indx TechStyle]

Unbelievable mistake done by ISRO. :biggrin2::biggrin2::biggrin2:

LOL, what?
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