Questions tagged [communication-satellite]

Questions about satellites designed to aid in communications, such as phone, TV and Internet satellites.

Filter by
Sorted by
Tagged with
1
vote
1answer
88 views

How much did the cheapest communications satellite cost?

Satellite communication is becoming bigger and better, and I wanted to find out more.
2
votes
1answer
74 views

Could you theoretically launch your own satellite and transmit satellite phone signals to it?

This is a RF and Space question mix, and I am new here and didn’t know where else to ask, so I asked here! This is in the United States btw.
11
votes
2answers
1k views

What does “clearing of C-band spectrum” mean and why will it cost Intelsat a billion dollars?

From "Intelsat files for bankruptcy" One of the primary catalysts for restructuring the balance sheet now is Intelsat’s desire to participate in the accelerated clearing of C-band spectrum under ...
3
votes
1answer
122 views

Determine envelopes for the payloads?

I am a mechanical engineer who is trying to expand my domain knowledge in aerospace and am currently reading a book to increase my understanding of it. I am mostly interested in studying the design of ...
4
votes
0answers
37 views

Curiosity / MRO UHF connection and weak signal modulation

In the case of MRO and Curiosity communications via UHF, an active feedback system was implemented in which Curiosity monitored the quality/SNR of the connection and commanded Curiosity to increase / ...
2
votes
1answer
55 views

How to calculate azimuth and elevation angle between aircraft and GEO satellite (in aircraft coordinates)

Given a fixed ground station, it is known how to calculate the azimuth and elevation. If changing it to an aircraft which is changing its data (location, altitude, angles) and working with same ...
4
votes
0answers
47 views

Any commercial communication satellite in GEO Orbit that supports 25 KW Power?

As I understand, EchosTAR-11, built by Space systems Loral, was the first 20KW Commercial satellite. (Reference: Recent Successful satellite systems- Visions for future by D.K.Sachdev).
2
votes
1answer
59 views

UHF transceiver for cubesats network

I already asked things related to this topic. But this time I will try to divide it by points to make it more understandable. Features of my cubesats: Would have 8 cubesats 3U in Earth's orbit The ...
3
votes
1answer
84 views

How do I calculate what antenna I need for my cubesat?

If I want to make a communication satellite, like MarCO, what formulas do I need to calculate the perfect antenna? Is there a difference between the X-Band and the classic UHF? If the cubesat is ...
5
votes
0answers
73 views

Where can I find data on satellite orbits?

I'm an enthusiast who'd like access to satellite orbital data to simulate / plot trajectories of manmade satellites (of any kind) on my home computer. Where's the best place for me to find this kind ...
3
votes
1answer
119 views

Will Optical communications be possible between Columbus' Ka-band (COLKa) Terminal at the ISS and EDRS?

The BBC's British radio antenna to arrive at space station says: The new fridge-sized terminal will route video, voice and data to the ground through satellites that are actually higher in the sky ...
0
votes
0answers
30 views

Which regulatory agencies involved in approving GMDSS providers are staffed with people from Inmarsat?

NASA Spaceflight's Iridium marks major milestone with maritime safety, breaks monopoly says: Since its implementation, Inmarsat has held a monopoly over the GMDSS. But that has now changed. ...
3
votes
2answers
137 views

Why do orbits in the Iridium constellation have an inclination of 86.4°?

Wikipedia's Iridium_satellite constellation; In-orbit spares says that Iridium satellites have an inclination of 86.4°: Significant orbital inclination changes are normally very fuel-intensive, but ...
2
votes
0answers
625 views

How to see Iridium Flares (if possible) in 2020 and beyond?

On December 27th, 2019, Iridium 97 burned up in the atmosphere and there was a "#Flarewell" celebration. However, according to this website which seems to be VERY detailed, there are still 5 ...
2
votes
2answers
134 views

Can communication satellite carry payload other than it's own boards?

Can we attach payload to communication satellite and detach it in space after having gained a specific altitude? What is probability that it will fail?
4
votes
1answer
163 views

Has FCC jurisdiction for all the world for SpaceX's Starlink position?

These days, you can read in the news that SpaceX requested FCC for permission to change the orbit of the Starlink satellites already in orbit. Now... from my understanding, the Starlink satellites ...
11
votes
1answer
2k views

Will Curiosity and the Mars 2020 rover be able to communicate with each other via a Mars orbiter?

Curiosity's UHF antenna on sol 2439 Could Curiosity and the Mars 2020 rover communicate with each other via the MRO orbiter ? And would it have advantages ? (Like: " I just saw a meteorite, and it'...
1
vote
0answers
44 views

Satellite Launch Aprroval: what is the role of ITU, FCC, and other international standards / regulators?

Seeking confirmation for the following assumption: Satellites used for non-communication applications (military surveillance, weather monitoring etc.) are launched without specific prior approval from ...
7
votes
1answer
222 views

How has the brightness of SpaceX's Starlink constellation changed since May?

Shortly after the launch, before full orientation of the solar panels and raising of the orbits, the Starlink satellites were surprisingly bright and easily seen with the naked eye. Back then, I heard ...
1
vote
1answer
82 views

Point Ahead Angle Calculation between LEO-GEO Satellite (ISL Scenario)

So, I have got two reference TLE from 2 different Satellite in LEO-GEO, which are as follows: (1st TLE for LEO, 2nd TLE for GEO) ...
1
vote
0answers
44 views

Velocity Vector Transformation for Point Ahead Angle and Doppler Shift Calculation for Inter-Satellite Link

So, I have the Radial and Tangential Velocity Vector (like in Figure 1) and also the Cartesian coordinate of 3D velocity vector. For reference, you can see in this link. Where, $o_{dot}$ vector matrix ...
1
vote
2answers
191 views

Point Ahead Angle and Doppler Shift Frequency Changes Calculation with the tangential/radial velocity component for Inter-Satellite Link

While calculating the Point Ahead Angle we work with Tangential Velocity vector component and to calculate the Doppler shift i.e changes in frequencies, we work with Radial Velocity Vector component. ...
2
votes
0answers
60 views

Does Surrey Satellite's Pathfinder lunar communications relay have customers lined up, or is it “If you build it, they will come”?

After about 24:00 in the BBC podcast Do We Need More Space Stations? BBC reporter Marnie Chesterton talks with Charles Cranston, the project manager for lunar ...
3
votes
1answer
316 views

How were the 100+ antennas around Telstar 1 and 2 configured?

Telstar 1 and 2 demonstrated routing of telephone, television and other communications types between continents. The Smithsonian Air and Space Museum pages below contain images of the satellites. ...
2
votes
0answers
174 views

When did they stop routing long-distance phone calls through satellites? What was the maximum volume at its peak?

I have read that in the early 1960's Telstar 1 and 2 were the first satellites to route long distance telephone calls. I seem to remember that long, long ago, long distance (overseas?) phone calls ...
1
vote
1answer
114 views

Understanding line of sight between two satellite with oblate Earth using “scaling k-component”

I have been doing some reading on accuracy of determining line-of-sight between two satellites give a WGS84 oblate earth. The paper Rapid Determination of Satellite Visibility Periods (Alfano, Negron ...
3
votes
2answers
148 views

How does a Hall effect ion thruster have a sea-level Isp of 800? Operates at 1 atmosphere?

Astronatix's SPT-100 lists the following: Stechkin electric rocket engine. Used on Meteor and Gals satellites. In Production. 1.35 kW Hall thruster. Thrust variable 2 to 20 kgf. ...
1
vote
0answers
50 views

How does a “hybrid orbital raising system” based on R-4D (N2O4/MMH) + SPT-100 (Hall effect) work exactly? (Intelsat 38 & 39)

Astronatix's Intelsat 39 lists the two engines SPT-100 Stechkin 1.35 kW Hall thruster. R-4D Marquardt N2O4/MMH rocket engine. 490 N. Question: Why is this combination on Intelsat 39 called "hybrid" ...
7
votes
2answers
318 views

Why do these satellite antennas look so weird? (strangely shaped with little white dots…)

The NASA Spaceflight article Arianespace press onward with dual-passenger Ariane 5 launch shows a photo of Intelsat 39 during testing. The dish reflectors are strangely shaped: rather than being ...
1
vote
1answer
45 views

Video standard used on Intelsat 1 (Early Bird)

I was watching a documentary on Intelsat 1 (also known as Early Bird) and some of the first live television sent over it. Was there any particular video format or modulation used, special for the ...
1
vote
1answer
129 views

Impact of having two antennas on link budget calculations

I'm working on link budget of a cubesat mission that needs to have two dipole antennas that are perpendicular to each other. I want to know if having two antennas affect the link budget? losses, and ...
2
votes
0answers
86 views

What is a “critical mass” equivalent of number of satellites on LEO that would initiate chain reaction of destruction if 2 of them collide?

If a satellite is destroyed and blown to multiple small pieces of debris, each one of these pieces has tiny probability of destroying another satellite, creating more debris which now will have even ...
0
votes
0answers
42 views

Relation between beamwidths of E-plane and H-plane

Is there any relation between E-plane and H-plane beamwidths of an antenna when steering in azimuth and elevation directions?
1
vote
1answer
53 views

Data Rates and Radios with Satellites [closed]

I am new to using radios and was wondering why do data rates matter when you use a radio to pull info from somewhere else. Also what does it mean when a satellite sends a wide band signal. Thank you ...
3
votes
2answers
434 views

What is meant by “a high-energy geostationary orbit”? (SpaceX Arabsat 6A)

The Teslarati article SpaceX’s April 7th Falcon Heavy launch a step toward new commercial markets says: While there is some inherent uncertainty surrounding the (once again) fairly new rocket, ...
3
votes
1answer
462 views

What is OneWeb's constellation's “progressive pitch” and how does it avoid interference with Ku-band satellites in GEO everywhere on Earth?

The Wikipedia article section OneWeb satellite constellation; Design characteristics tells us: The satellites will operate in the Ku band, communicating in the microwave range of frequencies in the ...
0
votes
1answer
1k views

What is considered a good SNR for satellites?

When performing a link budget for satellite communications, a key component is defining an acceptable signal-to-noise-ratio in order to obtain the necessary bit-rate. How does one determine what the ...
1
vote
0answers
41 views

How much of the piggybacked Aireon system rely on its Iridium Next hosts?

The NBC News article Next-generation satellites gave federal officials key data in Boeing 737 Max investigation says: The Federal Aviation Administration, or FAA, grounded Boeing's 737 Max ...
1
vote
1answer
254 views

How do Inmarsat 5 F4's beams correspond to all of these antennas and feeds?

note: This is an old-style @uhoh question meaning that it is a bit on the long side. In this case I think it really needs to be since the question is a bit complex; I'm trying to understand how all ...
2
votes
1answer
149 views

What is the lowest power signal that the DSN can detect?

It is said that the Deep Space Network can detect low-power signals sent from Voyager in the range of 10^-16 W. I can't seem to find any sources that indicate what the minimum power requirement of a ...
3
votes
0answers
188 views

Have the Starlink precursor Tintin satellites been talking to each other? If so, how?

Tintin A and B are the first two exploratory and testing spacecraft for SpaceX's Starlink program. It looks like they are in very similar orbits in both space and time, and are probably that way so ...
2
votes
1answer
364 views

Is it possible to capture geostationary satellites with DSLR?

DSLR is to be mounted on a tripod and pointed at sky with a zoom lens. Would a sufficiently long duration of exposure reveal these non-moving satellites as bright "stars" amongst the streaks caused ...
1
vote
2answers
581 views

How to lease a transponder on a GEO satellite?

I have an interesting question. I was thinking about it a year ago when the es'Hailsat 2 was not launched. There was an organization called "Outernet" that promissed to broadcast files (including ham ...
3
votes
2answers
340 views

What is a satellite trap?

I keep hearing about satellite traps, which have something to do with receiving and transmitting satellite communications, but I can't seem to find a definition. The securityaffairs.co blogpost Hack ...
3
votes
1answer
289 views

How often does a geostationary satellite enter into a Lunar shadow?

Is there a chance for the many geostationary satellites to enter into the moon’s shadow? If so, how frequently do such eclipses happen and how long do they typically last? Are such eclipses pre-...
17
votes
1answer
2k views

What is carrier lock and bit lock?

I'm not sure if this question belongs here or in Amateur Radio, but during the acquisition of signal from New Horizons on New Year's Day, I heard the controllers call out "carrier lock", "symbol lock",...
3
votes
1answer
154 views

Satellites around outer planets that act like amplifier to signals from voyager like objects

One issue of deep space exploration is that once the object (like Voyager) is far out in the solar system the physical distance is so great that the signal reaching Earth is very weak. I was wondering ...
4
votes
2answers
83 views

How close will the cubesats be when numerous of them are launched simultaneously?

Checking the onboard video of PSLV C43 gives a feel like the CubeSats are released in very proximity. Does this mean that these CubeSats will be orbiting in such very close proximity through out ...
6
votes
1answer
927 views

How low is VLEO? (FCC's newest approval for SpaceX)

Engaget's SpaceX gets FCC approval to deploy thousands more internet satellites says SpaceX's plan to build a global, high-speed wireless internet network using satellites has taken another step ...
2
votes
0answers
664 views

What technology will SpaceX's StarLink satellites most likely use for sat-to-sat linking?

The question How does SpaceX plan to make money with StarLink Broadband? has got me thinking about how the satellites will link to each other. Wikipedia says it's something greater than 10,000 GHz ...