In this century, our dependence on satellites has grown exponentially, and this dependence will continue to grow as more communication, navigation, and other useful SATs are launched into orbit. Besides, space tech provides valuable information about our planet’s resources and helps advance science, which eventually affects all spheres of our daily life. And yet, despite the importance of spacecraft in our lives, few people pause to think about satellite components, their functions, or the complex operational logic behind this tech. Below, we’ll try to fix that, explaining the overall logic, main structural components, and, most importantly answering — what is the purpose of the essential parts of a satellite?
How does a satellite system work?
In essence, a spacecraft system is a combination of the satellite itself and the ground station, aka ground control, that exchanges data with this satellite — receives information the spacecraft collects and sends additional commands when necessary. The type of information collected largely depends on mission goals, but most SmallSats capture images in different light spectrums. Those could be either optical images we’re used to on Earth or infrared shots that detect heat waves (i.e., from volcano eruptions or wildfires) or radiation.
However, the actual satellite components list goes beyond a camera for taking images and a computer to communicate with the ground station. For starters, satellites must maintain their position in orbit or adjust it if necessary. Besides, space is a very extreme environment, with temperature fluctuations ranging from −220°C to +220°C, so satellites should also be equipped with thermal components to protect them from extreme heat and cold.
But there is more, so let’s jump to essential satellite components!
Main satellite components and functions
Most satellites, except CubeSats, have custom designs and components to accomplish their diverse mission goals. Any mission-specific equipment a spacecraft carries, be it an optical camera or an infrared sensor, is referred to as payload. Payloads necessary to fulfil specific mission tasks can vary, but a satellite also needs a set of standard components to operate in space. The essential satellite components always include:
Power supply
Spacecraft relies on electric power to perform its essential functions. Some carry batteries, while others are equipped with solar panels for continuous operations in space. The combination of both is also possible to ensure smooth operation in sunlight and dark hours. A power distribution unit (PDU) later transmits power to all other satellite components.
Thermal control
As already mentioned, space is prone to extreme temperature fluctuations, so without a thermal component, our tech would not be able to survive in orbit. Depending on the satellite mission and destination, spacecraft are equipped with advanced heating and cooling systems, subdivided into passive and active components. Passive components basically cover layers and shields to protect the spacecraft shell from extreme heat or cold. Active components are a more advanced system with sensors and wires delivering heat to the satellite area that needs temperature adjustment.
Attitude control
The ACS measures satellite positioning orbit and adjusts it if necessary. For this, it relies on two major components: sensors that detect satellite movement and actuators that determine its orientation. More specifically, actuators monitor where a satellite points to — for example, to take images of designated areas from designated attitudes.
Propulsion
Sometimes, a satellite needs to adjust its orbital position — for example, move to another orbital destination or deviate from its course to avoid collision with space debris. That’s where propulsion comes in — a critical component that relies on a combination of thrusters powered by electricity, plasma, solid or liquid fuel, or even cold gas and solar sales, depending on satellite design.
Data handling
The data handling component is essentially an onboard computer that manages satellite operation. It receives and, if necessary, generates commands, stores data and information, etc. — depending on satellite mission goals, as well as other design components.
Communication
As you already guessed, these crucial components ensure communication with ground stations. So, what are the elements of a satellite communication system? In space, those are antennas and transponders handling signal reception and transmission. However, ground equipment is also a part of satellite communication systems — usually, these are facilities with more transponders and antennas, routing equipment, user terminals, as well as other network infrastructure components.
Upcoming innovations from space agencies
As you can see, spacecraft components are already highly advanced systems, but major space agencies keep working on new advances to enhance tech functionality and potential. For example, the European Space Agency (ESA) is now developing quantum communication satellites — these should have unprecedentedly high levels of encryption to protect sensitive information from cyber threats.
NASA is currently incorporating artificial intelligence and machine learning components into its spacecraft systems to enhance their autonomous operation. For example, AI-powered space tech should be able to prioritize which data must be transmitted in case of a real-time emergency or process more information with less control from the ground stations.
Bottom line, space tech promises a lot of interesting updates soon, so stay tuned for more posts!
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