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  2. Spectral phase interferometry for direct electric-field ...

    en.wikipedia.org/wiki/Spectral_phase_interferome...

    The spectral shear is typically generated by sum-frequency mixing the test pulse with two different quasi-monochromatic frequencies (usually derived by chirping a copy of the pulse itself), although it can also be achieved by spectral filtering or even with linear electro-optic modulators for picosecond pulses.

  3. Pulse-repetition frequency - Wikipedia

    en.wikipedia.org/wiki/Pulse-repetition_frequency

    The pulse-repetition frequency (PRF) is the number of pulses of a repeating signal in a specific time unit. The term is used within a number of technical disciplines, notably radar. In radar, a radio signal of a particular carrier frequency is turned on and off; the term "frequency" refers to the carrier, while the PRF refers to the number of ...

  4. AN/TPQ-53 Quick Reaction Capability Radar - Wikipedia

    en.wikipedia.org/wiki/AN/TPQ-53_Quick_Reaction...

    The radar is specifically designed to locate the firing positions of both rocket and mortar launchers. The AN/TPQ-53 has a maximum detection range of 38 miles / 60 km and has an operating frequency of 2 - 4 GHz.

  5. Ionosonde - Wikipedia

    en.wikipedia.org/wiki/Ionosonde

    A high frequency (HF) radio transmitter, automatically tunable over a wide range. Typically the frequency coverage is 0.5–23 MHz or 1–40 MHz, though normally sweeps are confined to approximately 1.6–12 MHz. A tracking HF receiver which can automatically track the frequency of the transmitter.

  6. NEXRAD - Wikipedia

    en.wikipedia.org/wiki/NEXRAD

    NEXRAD or Nexrad (Next-Generation Radar) is a network of 159 high-resolution S-band Doppler weather radars operated by the National Weather Service (NWS), an agency of the National Oceanic and Atmospheric Administration (NOAA) within the United States Department of Commerce, the Federal Aviation Administration (FAA) within the Department of Transportation, and the U.S. Air Force within the ...

  7. Frequency agility - Wikipedia

    en.wikipedia.org/wiki/Frequency_agility

    No matter how quickly the jammer responds, there will be a delay before it can switch and broadcast on the active frequency. During this period of time the aircraft is unmasked, allowing detection. [3] In its ultimate incarnation, each radar pulse is sent out on a different frequency and therefore renders single-frequency jamming almost impossible.

  8. The #1 Nutrient to Help You Sleep When You’re Traveling ...

    www.aol.com/lifestyle/1-nutrient-help-sleep...

    Getty Images. EatingWell design. When you’re flying across time zones or staying up late exploring new destinations, lack of sleep can leave you feeling groggy and irritable.

  9. Frequency-resolved optical gating - Wikipedia

    en.wikipedia.org/wiki/Frequency-resolved_optical...

    FROG extends this idea by measuring the spectrum of the signal at each delay (hence “frequency-resolved”), instead of just the intensity. This measurement creates a spectrogram of the pulse, which can be used to determine the complex electric field as a function of time or frequency as long as the nonlinearity of the medium is known.

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