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Radar altimeter gets altitude information by bouncing a radio wave off the surface of the Earth and determines the aircrafts altitude by measuring the length of time it takes for the signal to return.
Barometric altimeters get altitude information by measuring the barometric air pressure outside the aircraft. Barometric pressure decreases as altitude increases.
Radar altimeters will give altitude above ground level while barometric altimeters give altitude above sea level.
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What is measured by an altimeter?
An altimeter does not actually measure altitude directly, but rather just atmospheric pressure. So an altimeter is actually a barometer created for a specific purpose. See related link The altimeter measures the height above the ground and has a pointer which is adjustable depending in which air field you are taking off on. it measures the pressure of the air as you get higher off the ground the pressure reduces therefore it is able to determine your height above ground.
What is the difference between radar identification and radar contact?
Radar identified refers to your aircraft's position presented on a ground based radar screen and by using a squawk code in the aircraft which corresponds to the ground based station your aircraft is then identified. Radar control refers to an aircraft already identified on the radar screen and flying in controlled airspace under an IFR flight plan and the ground based station would provide heading, speed and altitude you should fly at.
May non radar tower controller use radar separtion between departure aircraft?
No. They don't have a radar repeater. Strictly visual.
What is the difference between radar level measurement and ultrasonic level measurement?
Radar is based on Microwave and detects the change in dielectric constant where as Ultrasonic is based on Sound Wave at high frequency (Ultrasonic Wave) and detects change in density of medium. Based on performance and accuracy Radar is a better solution than Ultrasonic. However for lower range liquid application ultrasonic is a cost effective solution. hope this is useful for you!
What does Ka mean on a radar?
It is a carrier Frequency Band between 26.5GHz and 40GHz
