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39 Cards in this Set
- Front
- Back
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Electromagnetic Spectrum |
Range of all possible EM radiation. All Em waves have a frequency, wavelength, and energy. |
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Wavelength Increases |
Frequency and Energy decrease. |
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Radio Wave |
Longest wavelength and lowest frequency. Primarily used for communication. Radio transmission, cell phone networks, and broadcast TV. |
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Microwaves |
Ranging between 1 millimeter and 1 meter in wavelength. Good for transmitting information. Ideal for data links and remote sensing such as its use in radar. |
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Infrared Light |
Far, mid (Intermediate) and near. Usually associated with thermal energy. Shorter wavelengths are used by TV remote controls. |
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Visible Light |
Only EM waves we can see. Individual waves as colors. |
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Ultraviolet Light |
Near UV, Middle UV, and Extreme UV. Sunburn. |
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X-Rays |
X-Rays light tends to act more like a particle than a wave. Wilhelm Conrad Roentgen discovered X-Rats in 1895. |
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Gamma-Rays |
Smallest wavelength. Radioactive and given off by nuclear explosions. Pass through most materials. Kill living cells. |
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RADAR Systems |
Are systems that use radio equipment in the generation, transmission, and reception of radio waves. |
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Heinrich R. Hertz |
Made the largest contribution to the conceivability of RADAR. Expanded in James C. Maxwell. |
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Continuous |
One antenna functions to transmit pulses. Other receives all the reflected energy. |
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Burst/Pulse |
Once the energy has left the antenna, the system switches to the receiver cycle, at which point it waits for and process any reflected energy. |
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Detection |
Act of receiving an RF energy return. |
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Azimuth |
The detection relative to the location of the RADAR. |
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Range |
Distance to the target in nautical miles. Between target and antenna. |
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Altitude |
The target's elevation above ground level. |
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Heading |
The direction the target is traveling. |
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Velocity |
Speed the target is traveling. |
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Radial Velocity |
The speed the target is traveling relative to the RADAR. |
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Range Resolution |
Distinguish separate targets flying close together. |
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Range Definition |
How accurately the RADAR can determine range. (Precise) |
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Pulse Modulation |
Taking generated RF signal and gating it on and off for specific amounts of time. |
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Pulse Duration (PD) |
Time that the RADAR set is transmitting. |
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Resting Time (RT) |
Period when the RADAR is not transmitting. Receiving any echo returns. |
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Pulse Repetition Time (PRT) |
Time period includes both pulse duration as well as resting time. PD + RT |
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Pulse Repetition Frequency (PRF) |
Number of PRTs per second. Measured in Hertz (Hz) |
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Pulse RADAR |
Transmit the necessary long duration, high-powered pulses needed to detect targets a great distance away. |
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Pulsed Doppler RADAR |
Transmit a series of pulses. Uses "Doppler Processing" to detect moving targets. Measurable difference indicated movement and is called a "frequency or Doppler" shift. |
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Synthetic Aperture RADAR |
Provides operators and commanders with a high-resolution, "photo-like" image if the area of interest. |
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Power Source |
Origin of any RADAR signal and operation. |
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Synchronizer |
It controls and times the operations. |
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Oscillator |
Resonates or oscillates at a specific frequency when struck by voltage. |
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Transmitter |
Amplifies the signal received from the oscillator. |
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Duplexer |
Single antenna to alternately transmit and receive. Found on mobile RADAR platforms. |
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Antenna |
Shapes the RF energy into a beam. |
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Receiver |
Amplifies the weak echo. |
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Indicator |
Digitized displays that can be visually interpreted. |
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Controller Computer |
Manages the operation of the RADAR set. |
