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RADAR

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    RADAR RADAR Presentation Transcript

    • Radar SEMINAR ON RADAR Swayoni Bandopadhyay CAMELLIA INSTITUTE OF TECHNOLOGY STREAM- ECE , 3rd YEAR BATCH- 2011- 2015
    • INDEX Introduction The Range Range Measurement Atmospheric Effect Types of Radar Applications Conclusion Bibliography
    • What is Radar? RADAR (Radio Detection And Ranging) is a way to detect and study far off targets by transmitting a radio pulse in the direction of the target and observing the reflection of the wave. It’s basically radio echo
    • RADAR RAdio Detection And Ranging Radar observables: • Target range • Target angles (azimuth & elevation) • Target size (radar cross section) • Target speed (Doppler) • Target features (imaging) Antenna Transmitted Pulse Target Cross Section Propagation Reflected Pulse (“echo”)
    • The Range In general v=d/t and d=vt The range is just a distance Since radio waves travel at the speed of light (v = c = 300,000 km/sec ) range = c•time/2
    • Radar Range Measurement Transmitted Pulse Reflected Pulse Range Target • Target range = cτ 2 where c = speed of light τ = round trip time
    • Atmospheric Effects
    • • Atmospheric attenuation • Reflection off of earth’s surface • Over-the-horizon diffraction • Atmospheric refraction Radar beams can be attenuated, reflected and bent by the environment Radar beams can be attenuated, reflected and bent by the environment
    • Radar Types
    • Primary Type Of Radar Continuous wave radar Continuous-wave radar is a type of radar system where a known stable frequency continuous Wave radio energy is transmitted and then received from any reflecting objects Two broad categories of continuous wave radar are Modulated and Unmodulated radar Pulse wave radar Pulsed radar transmits high power, high-frequency pulses toward the target. Choice of pulse repetition frequency decides the range and resolution of the radar. Two broad categories of pulsed radar are Moving Target Indicator MTI and Pulse Doppler Radar.
    • Fields of Applications Military applications, security, surveillance etc. Weather observation Air Traffic Control Radar speed meters Collision Avoidance Radars Inspection of Construction work Road maintenance
    • MILITARY Important Part of Air Defence System, Operation of offensive Missiles &Other Weapons. Target Detection, Target Tracking & Weapon Control. Tracks the targets, directs the weapon to an intercept and assess the effectiveness of engagement. Also used in area, ground &air surveillance.
    • AIR TRAFFIC CONTROL Used to safely control Air Traffic in the vicinity of the airports and enroute. Ground vehicular traffic & aircraft taxing. Mapping of regions of rain in the vicinity of airports & weather.
    • DAY TO DAY APPLICATIONS A LIFE SAVER Livermore engineering technologist used a micro power impulse radar sensor attached to an extender to search for trapped people through rubble at ground zero of world trade center following the September 11,2001 terrorist attacks. ROAD MAINTAINANCE The HERMES (high performance electromagnetic roadway mapping and evaluation system) Bridge inspector is a Radar based sensing system mounted in a trailer. This image shows a area where a delamination in the concrete may have occurred.
    • TUNNEL WALL INSPECTIONTUNNEL WALL INSPECTION MINE INSPECTIONMINE INSPECTION LOCATING UNDER GROUND PIPESLOCATING UNDER GROUND PIPES LOCATING GRAVELOCATING GRAVE
    • CONCLUSION RADAR is used to find velocity, range and position of the object. Advantage of RADAR is that it provide superior penetration capability through any type of weather condition. LIDAR is advanced type of radar which uses visible light from laser.
    • BIBLIOGRAPHY M. Kulkarni, “Microwave and Radar Engineering”, 3rd edition, Umesh Publication, 2003, pp. 493 – 536 Merri.I.skolnik, “Intoduction to Radar System”, 3rd edition, Tata McGraw Hill, 2003 “Types of Radar”, Engineers Garage,2012[online]. Available: http://www.engineersgarage.com/articles/type-of-radars [accessed: September 2012] References http://en.wikipedia.org/wiki/Radar http://www.radartutorial.eu/01.basics/rb01.en.htm