Questions tagged [radar]
Anything related to RADAR (RAdio Detection And Ranging) systems, their operations and circuits. RADAR systems are used to detect and locate a target by sweeping a beam of microwaves across a region of space and detecting echo signals reflected by the target.
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Numbers in Generating Phase Coherent Electronic Systems
I am reading the following paper 'Störmer’s numbers in generating phase coherent electronic systems' written in 1969.
More or less I understand that
in microwave applications there is clearly a use ...
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Active RF signal repeater
I have two stations, A and B.
Station A broadcasts a pure 10MHz sinusoidal signal on air. A ...
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Phase array for long waves
Can I make phase array for waves that are much longer than the array? For instance, I am looking at 1m array for waves of up to 100m. is it possible?
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SAR and ISAR sampling time
I'm seeking insight into the typical values of sampling times or refresh rates in radar systems. Specifically, I want to understand the time interval a radar operator must wait to receive new output ...
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Radar's radiation inside air traffic control tower [closed]
As a person working in a tower cab on which a ground movement radar is installed, I am curious what the typical power flux density would be inside the cab due its proximity. The frequency of the radar ...
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How to determine the Doppler radar frequency required to measure an object moving at a given speed
I'm trying to build a DIY tool to measure the speed of something moving very fast in a straight line, e.g. a bullet exiting the barrel of a rifle, based on the Doppler effect.
I've looked for several ...
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Do solid state phased arrays need isolated power supplies?
Non-isolated DC/DC supplies could have higher power density but it seems that high power solid state phased arrays utilize mostly isolated DC/DC converters to power each of their amplifiers.
Why are ...
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What kind of antennas does a modern AESA (e.g. AN/APG-81) use?
The AN/APG-81 has been used on F-35 airplanes. The Wikipedia page give some details about it, including its predecessor and successor. From the image on Wikipedia page, and that for the predecessor AN/...
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Skills to build an airborne radar [closed]
I am currently working on a project to develop an airborne ground penetrating radar - a payload to be put on a drone - we are aiming to develop a synthetic aperture ground penetrating radar of this ...
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Keysight vs Tektronix: AWG+RT SigAn or VSG+RT Oscilloscope?
I'm evaluating some new RF hardware for one of my university's research labs, for antenna testing. We are between a Keysight vector signal generator and a real-time oscope versus a Tektronix AWG and a ...
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Radar received RF signal phase-shifted by 90 to obtain I/Q signals
I am trying to get idea how marine radar works before start any repairing process. And this part confused me, most articles that i saw explain that in mixing stage we obtain I/Q signals using LO ...
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Advice on measuring relative speed and position of an active transmitting and reveiving object
Using multiple transmitter/receiver stations on ground and the doppler shift to measure relative velocity and position of an airborne active receiver/transmitter in low altitude (0-2 km).
I want to ...
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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 ...
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Chirp pulse compression as described in Stimson's book
I reference the below diagram, from Stimson's Airborne Radar, 2nd Ed. In the text he discusses how the frequency increases linearly throughout the duration of tau. The sketch of the frequency x time ...
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LED limit to short pulse and high power
I’m studying the viability of a small footprint distance detector that relies on a LED, a photodetector and some lenses. It’s meant for a distance above 150m, where the light beam travel time is ...
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