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.Review
Article
45 sectionsContents
- 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
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.
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.