Question

Write a two (2) page report on the recent space travel by NASA and SpaceX.
Explain any four electronics subsystems involved. (present in pdf or type)

Answer 1

On Tuesday, June 30th at 4:10 p.m. ET, 20:10 UTC, SpaceX's Falcon 9 successfully lifted off, carrying the Space Force's GPS III Space Vehicle 03 mission from Space Launch Complex 40 (SLC-40) at Cape Canaveral Air Force Station in Florida.

Following stage separation, SpaceX landed Falcon 9’s first stage on the “Just Read the Instructions” droneship, stationed in the Atlantic Ocean. The spacecraft deployed approximately 1 hour and 29 minutes after liftoff.

For the first time in history, NASA astronauts have launched from American soil in a commercially built and operated American crew spacecraft on its way to the International Space Station. The SpaceX Crew Dragon spacecraft carrying NASA astronauts Robert Behnken and Douglas Hurley lifted off at 3:22 p.m. EDT Saturday on the company’s Falcon 9 rocket from Launch Complex 39A at NASA’s Kennedy Space Center in Florida.

Falcon 9 is a reusable, two-stage rocket designed and manufactured by SpaceX for the reliable and safe transport of people and payloads into Earth orbit and beyond. Falcon 9 is the world’s first orbital class reusable rocket. Reusability allows SpaceX to refly the most expensive parts of the rocket, which in turn drives down the cost of space access.

  "This is a dream come true for me and everyone at SpaceX,” said Elon Musk, chief engineer at SpaceX. “It is the culmination of an incredible amount of work by the SpaceX team, by NASA and by a number of other partners in the process of making this happen. You can look at this as the results of a hundred thousand people roughly when you add up all the suppliers and everyone working incredibly hard to make this day happen.”

theese are news reports from NASA and SpaceX on Recent Space Travel..

Electronic Subsytems involved are,

• Magnetometer
• Sun sensors
• Earth horizon sensor
• GPS

Magnetometer

This device measures the strength of the Earth's magnetic field in one direction. For measurements on all three axes, the device would consist of three orthogonal magnetometers. The limitation of such a device is that in orbits far from Earth, the magnetic field is too weak and is actually dominated by the interplanetary field which is complicated and unpredictable.

GPS

  This sensor is simple in that using one signal many characteristics can be determined. A signal carries satellite identification, position, the duration of the propagated signal and clock information.this can be used for determining navigation, positioning, precise time, orbit, and attitude.

Sun sensors

This device works on the light entering a thin slit on top of a rectangular chamber that casts an image of a thin line on the bottom of the chamber, which is lined with a network of light-sensitive cells. These cells measure the distance of the image from a centerline and using the height of the chamber can determine the angle of refraction. The cells operate based on the photoelectric effect.

Earth horizon sensor

it can be divided into 2, that is static and scanning

Static

Static Earth horizon sensors contain a number of sensors and sense infrared radiation from the Earth’s surface with a field of view slightly larger than the Earth.

  Scanning

Scanning Earth horizon sensors use a spinning mirror or prism and focus a narrow beam of light onto a sensing element usually called a bolometer. The spinning causes the device to sweep out the area of a cone and electronics inside the sensor detect when the infrared signal from Earth is first received and then lost. The time between is used to determine Earth’s width. From this, the roll angle can be determined.

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