Les systèmes RADAR (CFAR)
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Cw and fm cw radar
This document discusses continuous wave (CW) radar and frequency modulated continuous wave (FMCW) radar. It defines radar as an electromagnetic device that can detect objects hidden from view using radio waves. Radar is classified into primary types including CW and modulated radar. CW radar uses the Doppler effect to detect moving targets based on changes in transmitted frequency. However, CW radar cannot determine range. FMCW radar modulates the transmitted frequency over time and compares the received frequency to determine both range and radial velocity of targets. Key applications of radar include military surveillance, weather monitoring, air traffic control and more.
Radar system
This document provides an overview of radar systems. It discusses the history, principle, basic design, and applications of radar. Radar was developed in the early 1900s and uses radio waves to detect and measure the range of objects. The basic components of a radar system include a transmitter, receiver, antenna, and display. Radar has military, air traffic control, remote sensing, and other applications. It has advantages such as ability to see through various mediums but also disadvantages like inability to distinguish close targets.
Military Radar
Radar stands for Radio Detection and Ranging. It is a system that transmits electromagnetic waves and analyzes the echoes from objects to detect and determine their range, altitude, direction or speed. The basic parts of a radar system include a transmitter, receiver, antenna and indicator. The radar equation describes the power returning to the receiving antenna based on factors like the transmitted power, antenna gains, radar cross section of the target, and distance. There are different types of radars like pulse radar, moving target indication radar, pulse Doppler radar and tracking radar used for various applications like air traffic control, missile guidance and ground surveillance.
Tracking Radar
Tracking radar continuously monitors the angle, range, and velocity of targets to determine their trajectory over time. There are several types, including single target trackers designed for high precision on guided missiles and air surveillance radars for lower precision air traffic monitoring. Tracking is achieved through angular measurements made by conical scanning, amplitude comparison monopulse, or phase comparison monopulse systems. Factors like glint, receiver noise, and servo errors can impact tracking accuracy.
Radar fundamentals
What is radar
Principle of radar
Block diagram
Radar functions
Electromagnetic spectrum
Coordinate system
Radar system
Basic and brief introduction of radar system with its basic working principle,classification,technology, component and application.
Recommandé
Cw and fm cw radar
This document discusses continuous wave (CW) radar and frequency modulated continuous wave (FMCW) radar. It defines radar as an electromagnetic device that can detect objects hidden from view using radio waves. Radar is classified into primary types including CW and modulated radar. CW radar uses the Doppler effect to detect moving targets based on changes in transmitted frequency. However, CW radar cannot determine range. FMCW radar modulates the transmitted frequency over time and compares the received frequency to determine both range and radial velocity of targets. Key applications of radar include military surveillance, weather monitoring, air traffic control and more.
Radar system
This document provides an overview of radar systems. It discusses the history, principle, basic design, and applications of radar. Radar was developed in the early 1900s and uses radio waves to detect and measure the range of objects. The basic components of a radar system include a transmitter, receiver, antenna, and display. Radar has military, air traffic control, remote sensing, and other applications. It has advantages such as ability to see through various mediums but also disadvantages like inability to distinguish close targets.
Military Radar
Radar stands for Radio Detection and Ranging. It is a system that transmits electromagnetic waves and analyzes the echoes from objects to detect and determine their range, altitude, direction or speed. The basic parts of a radar system include a transmitter, receiver, antenna and indicator. The radar equation describes the power returning to the receiving antenna based on factors like the transmitted power, antenna gains, radar cross section of the target, and distance. There are different types of radars like pulse radar, moving target indication radar, pulse Doppler radar and tracking radar used for various applications like air traffic control, missile guidance and ground surveillance.
Tracking Radar
Tracking radar continuously monitors the angle, range, and velocity of targets to determine their trajectory over time. There are several types, including single target trackers designed for high precision on guided missiles and air surveillance radars for lower precision air traffic monitoring. Tracking is achieved through angular measurements made by conical scanning, amplitude comparison monopulse, or phase comparison monopulse systems. Factors like glint, receiver noise, and servo errors can impact tracking accuracy.
Radar fundamentals
What is radar
Principle of radar
Block diagram
Radar functions
Electromagnetic spectrum
Coordinate system
Radar system
Basic and brief introduction of radar system with its basic working principle,classification,technology, component and application.
RADAR
RADAR is an electromagnetic detection system that works by transmitting electromagnetic waves and studying the echo or reflected back waves. It has applications in air traffic control, ship safety, military uses, and more. The maximum unambiguous range of a radar is determined by its pulse repetition frequency, beyond which targets will cause ambiguous echoes. MTI radar uses doppler filtering and pulse cancellation to remove stationary clutter and detect moving targets. Limitations include equipment instability, internal clutter fluctuations, and finite time observing targets while scanning. Noncoherent MTI detects moving targets using amplitude fluctuations rather than phase fluctuations as in coherent MTI radar.
RF and Microwave Engineering
This document provides information about RF and microwave engineering:
1. It defines radio frequency as any electromagnetic wave frequency between 3KHz to 300GHz, which includes frequencies used for communications and radar signals. Microwaves are defined as electromagnetic waves between 300MHz to 300GHz.
2. Microwave engineering deals with the design of communication, navigation, and other systems that operate in the microwave frequency range. Key applications discussed include microwave ovens, radar, satellite communication, and TV.
3. Analysis of microwave circuits differs from low frequency circuits as the physical length of components is larger than signal wavelengths. S-parameters are used to relate the amplitude of scattered waves to incident waves in microwave circuit analysis.
Radar presentation
Radar, which stands for radio detection and ranging, uses electromagnetic waves to detect distant objects such as aircraft, ships, motor vehicles, weather formations, and terrain. The document provides an overview of radar including its history, basic principles, components, types, factors affecting performance, applications, and advantages and disadvantages. It discusses how radar works by transmitting pulses of radio waves that bounce off objects and return to the radar receiver, enabling the determination of an object's range, altitude, direction, or speed.
Radio and Radar: Radar
Radar and secondary radar systems use radio waves to detect objects and provide essential information to operators. Radar works by transmitting radio waves that bounce off targets and are received, allowing calculation of range and position. Secondary radar requires aircraft to carry transponders that respond to interrogations by transmitting a coded reply signal carrying additional data like identification and altitude. This improves detection range and allows transmission of emergency information.
Components of a Pulse Radar System
Radar was invented in the early 1900s and applied during World War II to detect aircraft. The basic principles of radar involve transmitting electromagnetic signals that are reflected off targets and detected. A typical radar system includes a transmitter, antenna, receiver, and display. The radar range equation relates key variables such as transmitted power, wavelength, target radar cross-section, and system losses to the maximum detectable range. Integration of multiple radar returns can improve the signal-to-noise ratio and increase detection range.
introduction to radar
Radar was originally developed for military purposes during World War 2 to locate ships and airplanes. Scientists later discovered that radar could also detect precipitation, leading to its widespread use today in weather prediction and analysis. The document discusses the history and components of pulse transmission and continuous wave radars. It also covers different types of radars like search, tracking, air surveillance and weather radars as well as radar antenna types including reflector and array antennas. The performance of radar is influenced by factors like frequency bandwidth, antenna size, transmitter power and propagation effects which determine appropriate frequency bands for different radar applications and ranges.
Radar communication
The document discusses the history and components of radar systems. It describes how radar works by transmitting pulses that reflect off targets and return to the radar's receiver. Key radar observables are discussed like target range, angle, size, speed and features. The document also covers different types of radar including pulse and continuous wave, and various applications such as air traffic control, weather monitoring, and military uses. It concludes by discussing emerging radar technologies.
Radar Basics
Radar uses radio waves to detect objects and determine their range, direction, and speed. It works by transmitting pulses of radio waves and receiving the echoes bounced back from objects. The time delay between transmission and reception is used to calculate distances to targets. Doppler radar uses the Doppler effect of radio waves to detect how fast targets are moving based on changes in frequency of the echoes.
Small scale fading
Channel issues
Accuracy of Models
Large-scale: Path loss
Medium-scale: Shadowing
Small-scale: Multipath fading
Chapter 3- pulsed radar system and MTI
This document discusses different types of pulsed radar systems and moving target indication techniques. It describes coherent and non-coherent radar systems, with coherent systems able to use echo phase information to determine target range and velocity. It then focuses on phase processing moving target indication using a delay-line canceller. The canceller subtracts delayed and undelayed video signals, causing signals from stationary targets to cancel out while signals from moving targets remain. This allows the radar display to only show moving targets.
Two cavity klystron
A Klystron is a vacuum tube that can be used either as a generator or as an amplifier or as an oscillator, at microwave frequencies.The Klystron is a linear beam device; that is, the electron flow is in a straight line focused by an axial magnetic field.
Microwave engineering basics
The document summarizes key components and concepts in basic microwave engineering. It discusses waveguides and their operating frequencies based on dimensions. It also describes electric and magnetic fields in rectangular waveguides. Additional components summarized include coaxial to waveguide transitions, choke joints, coupling loops, phase shifters, junctions, tuners, mixers, isolators, circulators, directional couplers, and cavity resonators. Isolators, circulators, and directional couplers are multi-port devices that control the direction of signal propagation with differing levels of attenuation.
radar
The document discusses different types of radar systems and their components and principles of operation. It covers topics like pulse radar vs continuous wave radar, components of each type of system like transmitter, receiver, antennas, and how factors like pulse width, repetition frequency and power affect radar performance and capabilities. It also discusses modulation techniques, antenna beam formation, and different types of radar displays.
Moving target indicator radar (mti)
The document discusses radar clutter and techniques for eliminating it. Clutter refers to radar returns from stationary objects that are not of interest. Two main techniques for reducing clutter are discussed: moving target indication (MTI) radar, which detects Doppler shifts from moving targets, and delay line cancellers/transversal filters, which cancel out stationary clutter returns. MTI radars preserve phase coherence to differentiate stationary vs moving targets, while cancellers/filters use weighted signal delays and summing to attenuate clutter signals.
Study of Radar System PPT
This document summarizes Atul Sharma's training report on studying radar systems during an internship from June 16th to July 26th 2014. It introduces radar technology, explaining that radar uses radio waves to detect objects and determine their location, distance and direction. It then describes the basic principles of how radar works, including the radar range equation. It also outlines the main components of a radar system, such as the antenna, transmitter, receiver and display, and different types of radars like primary and secondary radar. Finally, it provides examples of specific radar sets used in India.
radar
The document discusses the components and basic principles of radar. It explains that radar works by transmitting short bursts of radio signals and measuring the time it takes for those signals to reflect off objects and return. It identifies the three major components of radar as the scanner, transceiver, and indicator. The scanner rotates and transmits the radio signals, while the transceiver contains the transmitter and receiver. The indicator displays the objects detected by radar to help with navigation and collision avoidance. Basic radar components include a power supply, modulator, transmitter, and antenna system.
Lec3
There are two basic types of radar: pulse transmission radar and continuous wave radar. Pulse transmission radar uses pulses of radio waves and measures the echo to determine characteristics like range, velocity, and direction of targets. Continuous wave radar transmits a continuous radio signal and detects frequency changes in the return echo to deduce such properties. The performance of radars is influenced by various factors related to the pulse shape, width, repetition frequency, power, and the receiver's bandwidth, sensitivity, and signal-to-noise ratio. Trade-offs exist between different performance characteristics like range accuracy, maximum range, and resolution.
Radar
RADAR (Radio Detection and Ranging) uses radio pulses transmitted in the direction of a target and observes the reflection to detect and study distant targets. It measures a target's range, angles, size, speed, and features. The major radar components are an antenna, transmitter, receiver and display. Radar operates at different frequency bands and is used for applications like air traffic control, weather monitoring, and navigation.
radar technology
This document provides an overview of radar systems. It discusses what radar is, the evolution of radar from its initial uses detecting objects with radio waves in the late 1800s. It then explains the basic principles of how radar works to detect objects using radio signal transmission and reflection. Key components of radar systems like transmitters, receivers, antennas and signal processing are described. Applications of radar systems include military, remote sensing, air traffic control, and navigation. The document also discusses radar modulators and antenna design considerations for radar.
Tracking
1. Angle tracking systems use antenna beam patterns and signal amplitude measurements to determine the direction of a target. Common tracking techniques include lobe switching, conical scanning, and monopulse.
2. Conical scanning nutates a single beam to produce amplitude modulated target returns that can be used to calculate the tracking error. Monopulse uses overlapping dual beams and a hybrid circuit to directly measure the tracking error from the amplitude ratio of the difference and sum channels.
3. Instrument landing systems apply the principles of monopulse tracking to provide lateral and vertical guidance for aircraft during low visibility landings.
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Tendances
RADAR
RADAR is an electromagnetic detection system that works by transmitting electromagnetic waves and studying the echo or reflected back waves. It has applications in air traffic control, ship safety, military uses, and more. The maximum unambiguous range of a radar is determined by its pulse repetition frequency, beyond which targets will cause ambiguous echoes. MTI radar uses doppler filtering and pulse cancellation to remove stationary clutter and detect moving targets. Limitations include equipment instability, internal clutter fluctuations, and finite time observing targets while scanning. Noncoherent MTI detects moving targets using amplitude fluctuations rather than phase fluctuations as in coherent MTI radar.
RF and Microwave Engineering
This document provides information about RF and microwave engineering:
1. It defines radio frequency as any electromagnetic wave frequency between 3KHz to 300GHz, which includes frequencies used for communications and radar signals. Microwaves are defined as electromagnetic waves between 300MHz to 300GHz.
2. Microwave engineering deals with the design of communication, navigation, and other systems that operate in the microwave frequency range. Key applications discussed include microwave ovens, radar, satellite communication, and TV.
3. Analysis of microwave circuits differs from low frequency circuits as the physical length of components is larger than signal wavelengths. S-parameters are used to relate the amplitude of scattered waves to incident waves in microwave circuit analysis.
Radar presentation
Radar, which stands for radio detection and ranging, uses electromagnetic waves to detect distant objects such as aircraft, ships, motor vehicles, weather formations, and terrain. The document provides an overview of radar including its history, basic principles, components, types, factors affecting performance, applications, and advantages and disadvantages. It discusses how radar works by transmitting pulses of radio waves that bounce off objects and return to the radar receiver, enabling the determination of an object's range, altitude, direction, or speed.
Radio and Radar: Radar
Radar and secondary radar systems use radio waves to detect objects and provide essential information to operators. Radar works by transmitting radio waves that bounce off targets and are received, allowing calculation of range and position. Secondary radar requires aircraft to carry transponders that respond to interrogations by transmitting a coded reply signal carrying additional data like identification and altitude. This improves detection range and allows transmission of emergency information.
Components of a Pulse Radar System
Radar was invented in the early 1900s and applied during World War II to detect aircraft. The basic principles of radar involve transmitting electromagnetic signals that are reflected off targets and detected. A typical radar system includes a transmitter, antenna, receiver, and display. The radar range equation relates key variables such as transmitted power, wavelength, target radar cross-section, and system losses to the maximum detectable range. Integration of multiple radar returns can improve the signal-to-noise ratio and increase detection range.
introduction to radar
Radar was originally developed for military purposes during World War 2 to locate ships and airplanes. Scientists later discovered that radar could also detect precipitation, leading to its widespread use today in weather prediction and analysis. The document discusses the history and components of pulse transmission and continuous wave radars. It also covers different types of radars like search, tracking, air surveillance and weather radars as well as radar antenna types including reflector and array antennas. The performance of radar is influenced by factors like frequency bandwidth, antenna size, transmitter power and propagation effects which determine appropriate frequency bands for different radar applications and ranges.
Radar communication
The document discusses the history and components of radar systems. It describes how radar works by transmitting pulses that reflect off targets and return to the radar's receiver. Key radar observables are discussed like target range, angle, size, speed and features. The document also covers different types of radar including pulse and continuous wave, and various applications such as air traffic control, weather monitoring, and military uses. It concludes by discussing emerging radar technologies.
Radar Basics
Radar uses radio waves to detect objects and determine their range, direction, and speed. It works by transmitting pulses of radio waves and receiving the echoes bounced back from objects. The time delay between transmission and reception is used to calculate distances to targets. Doppler radar uses the Doppler effect of radio waves to detect how fast targets are moving based on changes in frequency of the echoes.
Small scale fading
Channel issues
Accuracy of Models
Large-scale: Path loss
Medium-scale: Shadowing
Small-scale: Multipath fading
Chapter 3- pulsed radar system and MTI
This document discusses different types of pulsed radar systems and moving target indication techniques. It describes coherent and non-coherent radar systems, with coherent systems able to use echo phase information to determine target range and velocity. It then focuses on phase processing moving target indication using a delay-line canceller. The canceller subtracts delayed and undelayed video signals, causing signals from stationary targets to cancel out while signals from moving targets remain. This allows the radar display to only show moving targets.
Two cavity klystron
A Klystron is a vacuum tube that can be used either as a generator or as an amplifier or as an oscillator, at microwave frequencies.The Klystron is a linear beam device; that is, the electron flow is in a straight line focused by an axial magnetic field.
Microwave engineering basics
The document summarizes key components and concepts in basic microwave engineering. It discusses waveguides and their operating frequencies based on dimensions. It also describes electric and magnetic fields in rectangular waveguides. Additional components summarized include coaxial to waveguide transitions, choke joints, coupling loops, phase shifters, junctions, tuners, mixers, isolators, circulators, directional couplers, and cavity resonators. Isolators, circulators, and directional couplers are multi-port devices that control the direction of signal propagation with differing levels of attenuation.
radar
The document discusses different types of radar systems and their components and principles of operation. It covers topics like pulse radar vs continuous wave radar, components of each type of system like transmitter, receiver, antennas, and how factors like pulse width, repetition frequency and power affect radar performance and capabilities. It also discusses modulation techniques, antenna beam formation, and different types of radar displays.
Moving target indicator radar (mti)
The document discusses radar clutter and techniques for eliminating it. Clutter refers to radar returns from stationary objects that are not of interest. Two main techniques for reducing clutter are discussed: moving target indication (MTI) radar, which detects Doppler shifts from moving targets, and delay line cancellers/transversal filters, which cancel out stationary clutter returns. MTI radars preserve phase coherence to differentiate stationary vs moving targets, while cancellers/filters use weighted signal delays and summing to attenuate clutter signals.
Study of Radar System PPT
This document summarizes Atul Sharma's training report on studying radar systems during an internship from June 16th to July 26th 2014. It introduces radar technology, explaining that radar uses radio waves to detect objects and determine their location, distance and direction. It then describes the basic principles of how radar works, including the radar range equation. It also outlines the main components of a radar system, such as the antenna, transmitter, receiver and display, and different types of radars like primary and secondary radar. Finally, it provides examples of specific radar sets used in India.
radar
The document discusses the components and basic principles of radar. It explains that radar works by transmitting short bursts of radio signals and measuring the time it takes for those signals to reflect off objects and return. It identifies the three major components of radar as the scanner, transceiver, and indicator. The scanner rotates and transmits the radio signals, while the transceiver contains the transmitter and receiver. The indicator displays the objects detected by radar to help with navigation and collision avoidance. Basic radar components include a power supply, modulator, transmitter, and antenna system.
Lec3
There are two basic types of radar: pulse transmission radar and continuous wave radar. Pulse transmission radar uses pulses of radio waves and measures the echo to determine characteristics like range, velocity, and direction of targets. Continuous wave radar transmits a continuous radio signal and detects frequency changes in the return echo to deduce such properties. The performance of radars is influenced by various factors related to the pulse shape, width, repetition frequency, power, and the receiver's bandwidth, sensitivity, and signal-to-noise ratio. Trade-offs exist between different performance characteristics like range accuracy, maximum range, and resolution.
Radar
RADAR (Radio Detection and Ranging) uses radio pulses transmitted in the direction of a target and observes the reflection to detect and study distant targets. It measures a target's range, angles, size, speed, and features. The major radar components are an antenna, transmitter, receiver and display. Radar operates at different frequency bands and is used for applications like air traffic control, weather monitoring, and navigation.
radar technology
This document provides an overview of radar systems. It discusses what radar is, the evolution of radar from its initial uses detecting objects with radio waves in the late 1800s. It then explains the basic principles of how radar works to detect objects using radio signal transmission and reflection. Key components of radar systems like transmitters, receivers, antennas and signal processing are described. Applications of radar systems include military, remote sensing, air traffic control, and navigation. The document also discusses radar modulators and antenna design considerations for radar.
Tracking
1. Angle tracking systems use antenna beam patterns and signal amplitude measurements to determine the direction of a target. Common tracking techniques include lobe switching, conical scanning, and monopulse.
2. Conical scanning nutates a single beam to produce amplitude modulated target returns that can be used to calculate the tracking error. Monopulse uses overlapping dual beams and a hybrid circuit to directly measure the tracking error from the amplitude ratio of the difference and sum channels.
3. Instrument landing systems apply the principles of monopulse tracking to provide lateral and vertical guidance for aircraft during low visibility landings.
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Les systèmes RADAR (CFAR)
- 1. بسم الله الرحمن الرحيم
- 2. REPUBLIQUE ALGERIENNE DEMOCRATIQUE ET POPULAIRE MINISTERE DE L’ENSEIGNEMENT SUPERIEUR ET DE LA RECHERCHE SCIENTIFIQUE UNIVERSITE MOHAMED KHIDER- BISKRA FACULTE DES SCIENCES ET SCIENCES DE L’INGENIEUR DEPARTEMENT D’AUTOMATIQUE THEME DES DETECTEURS CA, OS et ML-CFAR DANS UN CLUTTER DE DISTRIBUTION WEIBULL ANALYSE DES PERFORMANCES Proposé et dirigé par : Latifa Abdou Présenté par : Achbi Med Said Abadli A/Moutaleb
- 3. Plan du travail Introduction La détection Radar La détection CFAR Analyse des détecteurs CA, OS et ML-CFAR Résultats et interprétation Conclusion
- 40. MERCI POUR VOTRE AIMABLE ATTENTION
- 41. Questions ?