radar

Also known as R.A.D.A.R., Radio Detection and Ranging

Radar is a system that uses radio waves to determine the distance (ranging), direction (azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations and terrain. The term RADAR was coined in 1940 by the United States Navy as an acronym for "radio detection and ranging". The term radar has since entered English and other languages as an anacronym, a common noun, losing all capitalization.

AI overview

Radar is a technology that uses radio waves to detect objects and determine how far away they are, where they're located, and how fast they're moving toward or away from you. It's widely used to track aircraft, ships, weather patterns, and other objects that need to be monitored from a distance.

AI-generated from the Wikipedia summary — may contain errors.

Research

11,993 papers

Towards Deep Radar Perception for Autonomous Driving: Datasets, Methods, and Challenges.ReviewSensors (Basel, Switzerland) · 2022Zhou Y, Liu L, Zhao H et al.DOI: 10.3390/s22114208
MmWave Radar and Vision Fusion for Object Detection in Autonomous Driving: A Review.ReviewSensors (Basel, Switzerland) · 2022Wei Z, Zhang F, Chang S et al.DOI: 10.3390/s22072542
Monitoring aerial insect biodiversity: a radar perspective.ReviewPhilosophical transactions of the Royal Society of London. Series B, Biological sciences · 2024Bauer S, Tielens EK, Haest BDOI: 10.1098/rstb.2023.0113
A Review on Radar-Based Human Detection Techniques.ReviewSensors (Basel, Switzerland) · 2024Buyukakkaslar MT, Erturk MA, Aydin MADOI: 10.3390/s24175709
State-of-the-Art Wearable Sensors and Possibilities for Radar in Fall Prevention.ReviewSensors (Basel, Switzerland) · 2021Argañarás JG, Wong YT, Begg R et al.DOI: 10.3390/s21206836
Radar-Based Heart Sound Detection.Scientific reports · 2018Will C, Shi K, Schellenberger S et al.DOI: 10.1038/s41598-018-29984-5
Radar-based contactless heart beat detection with a modified Pan-Tompkins algorithm.Biomedical physics & engineering express · 2024Thi Yen H, Tiep VT, Hoang VP et al.DOI: 10.1088/2057-1976/ad8c48
Weather radar utility in hazard detection and response.Journal of emergency management (Weston, Mass.) · 2024Benson MJ, Norby TP, Kabela ED et al.DOI: 10.5055/jem.0868

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Wikidata facts

Image: Ravenna, radar dell'aeroporto (04).jpg

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Stack Exchange tag: physics.stackexchange.com/tags/radar
Commons category: Radars
Commons gallery: Radar
name: radar

Sources (9)

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~69 min read

Article

45 sections

Contents

History
First experiments
Before World War II
During World War II
Applications
Principles
Radar signal
Illumination
Reflection
Radar range equation
Doppler effect
Polarization
Limiting factors
Beam path and range
Noise
Interference
Clutter
Jamming
Signal processing
Distance measurement
Transit time
Frequency modulation
Pulse compression
Speed measurement
Pulse-Doppler signal processing
Reduction of interference effects
Plot and track extraction
Engineering
Antenna design
Parabolic reflector
Types of scan
Slotted waveguide
Phased array
Frequency bands
Modulators
Coolant
Regulations
Configurations
See also
Notes and references
Bibliography
References
General
Technical reading
External links

A radar system consists of a transmitter producing electromagnetic waves in the radio or microwave domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. Radio waves (pulsed or continuous) from the transmitter reflect off the objects and return to the receiver, giving information about the objects' locations and speeds. This device was developed secretly for military use by several countries in the period before and during World War II. A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution.