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2. Chirp - Wikipedia

   en.wikipedia.org/wiki/Chirp

   A chirp is a signal in which the frequency increases (up-chirp) or decreases (down-chirp) with time. In some sources, the term chirp is used interchangeably with sweep signal. [1] It is commonly applied to sonar, radar, and laser systems, and to other applications, such as in spread-spectrum communications (see chirp spread spectrum). This ...

3. Sonar signal processing - Wikipedia

   en.wikipedia.org/wiki/Sonar_signal_processing

   Sonar systems are generally used underwater for range finding and detection. Active sonar emits an acoustic signal, or pulse of sound, into the water. The sound bounces off the target object and returns an echo to the sonar transducer. Unlike active sonar, passive sonar does not emit its own signal, which is an advantage for military vessels.

4. Sonar - Wikipedia

   en.wikipedia.org/wiki/Sonar

   Modern versions of the net sounder, using multiple element transducers, function more like a sonar than an echo sounder and show slices of the area in front of the net and not merely the vertical view that the initial net sounders used. The sonar is an echo-sounder with a directional capability that can show fish or other objects around the vessel.

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   Costco, Walmart and Other Stores With Perks Retirees Need To Be Taking Advantage Of 8 Common Mistakes Retirees Make With Their Social Security Checks The Trump Economy Begins: 4 Money Moves ...

6. Here's what AOL readers are buying during the Cyber Monday ...

   www.aol.com/lifestyle/heres-what-aol-readers-are...

   Walmart is celebrating the finale to Black November — what we are affectionately referring to the many, many days and weeks of sales since early last month — with the final online-only ...

7. Chirp compression - Wikipedia

   en.wikipedia.org/wiki/Chirp_compression

   The chirp pulse compression process transforms a long duration frequency-coded pulse into a narrow pulse of greatly increased amplitude. It is a technique used in radar and sonar systems because it is a method whereby a narrow pulse with high peak power can be derived from a long duration pulse with low peak power.