Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [satellite]

Circuit design for satellites differs because of the space environment, which includes designating for vacuum, large temperature swings, and radiation tolerance. Satellite circuits should be able to handle latch ups and Single Event Upsets (SEU's) from radiation that ionizes silicon channels and recover from faults.

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Current limiting solution for pocketqube satellite

A project I am working on requires a reliable current limiting solution for a pocketqube picosatellite. Currently a Texas TPS2553 is being employed which will cut power once the limit is hit. We are concerned that this could enter the power supply…
MIL-SPEC
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Radiation tolerance of MCUs

I'm working on a cubesat project intended to operate in low earth orbit. We're considering a few different options for our flight computer, ranging from Raspberry Pi to something like STM32L476. Despite being told repeatedly that "Raspberry Pis have…
crossroad
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How does satellite TV get through in rain?

How does satellite TV get through in rain? I read somewhere that satellites make use of KU band to transmit data, we have heavy rainfall in various times of the year but even during those times TV channels run smoothly without problem. How is it…
SeenUnseen
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What are the limitations of USB in aerospace (especially microsatellites)?

I have just joined a startup company that builds microsatellites. But I am quite new to the aerospace field. I noticed that to connect components with the onboard computer we use many electrical protocols such as SPI, I²C, RS-485, SpaceWire, etc.,…
LastStarDust
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Can anyone explain Phantom Power and, specifically, how it's used in satellite television systems?

Although I spent many years in the electrical field, I specialized in Electrical Metrology (a long time ago). Bearing this in mind, I really know very little about satellite television system theory. As we recently lost our ability to acquire…
Red Oak
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How do I move a motor to a desired angle using a motor encoder?

So I have this project, the goal is basically to be able to make a motor move to rotate a set of gears and move a panel attached to a hinge to a desired angle. I have a motor encoder attached to the motor:…
Keltq
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Why this grounding scheme?

The NASA technical book about grounding in spacecraft (NASA-HDBK-4001) (I believe the question may be relevant for any other terrestrial application) mentions this grounding scheme for subsystems: Each subsystem enclosure is grounded (connected to…
Joan
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Is this how cable networking works?

I am studying about how cable networks transmit data to various TV channels on our TV screen. It is fascinating to see how they work. After studying different articles online, I have made points as to how the process works. There is no single…
S.M.T
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Modulator in lasercom: from theory to practice

Hello everyone! We are working on a realisation of an optical modulator and have a doubt. Mr Noel Miller posted already a question, but it was suggested this community. I will repost his question because he have not an account here. PS I have…
Anna Koroleva
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Output back off of a high power amplifier (HPA)

We are selling S-band HPAs for satcom applications. A customer needs to obtain key RF characteristics of the S-Band HPA, specifically the wideband frequency response of carriers as a function of output level to understand out of band energy…
W.Dabbas
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How does the 4th satellite in GPS know the time offset?

Going through the working of GPS technology, I came to know that at least 4 satellites must be visible to solve for the location with considerable accuracy. Going through most of the resources, I can visualize how three coordinates of the location…
G-aura-V
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Where would be the best place to start looking for information on developing a bootloader using 2 microcontrollers for a CubeSat?

I am an engineering student who has just begun working on a CubeSat project for my design class. We are working on the OBC, specifically looking at developing a bootloader at this time. The OBC components have been selected by previous teams and an…
Nick Landrigan
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Source generator for Satellite Tuner input

I need to design a source generator for a TV factory. They want to automatize the functional tests by applying a test module to the TV's at the end of the production line. All the peripherals of the TV (USB HDMI Satellite Terrestrial etc) will be…
Alper91
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Computation Doppler shift in ppm

I am computing Doppler shift for different flying platforms and after my first presentation, it was suggested to revise in ppm. I compute always in Hz and have never heard even about this unit until the day of the presentation. What does the…
Aid22
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How is Doppler beam sharpening and synthetic aperture forming the same thing?

There's a quote here from Carl Wiley, the inventor of synthetic aperture radar: "I had the luck to conceive of the basic idea, which I called Doppler Beam Sharpening (DBS), rather than Synthetic Aperture Radar (SAR). Like all signal processing,…
Robbie Mallett
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