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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.
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 ).
In digital communications, chirp spread spectrum (CSS) is a spread spectrum technique that uses wideband linear frequency modulated chirp pulses to encode information. [1] A chirp is a sinusoidal signal whose frequency increases or decreases over time (often with a polynomial expression for the relationship between time and frequency).
The stationary phase method does not predict or deal with Fresnell ripples, so it is unable to offer any means by which these ripples can be minimized. As an example, the figure below shows a chirp spectrum with T. Δ F =250 obtained for a non-linear chirp aiming to match the Hamming window, using the methods described above. The figure shows ...
At the Three Oak Hill Drive crossroads, a track north-east points to Birch Copse (grid reference Duke's Vaunt Oak (grid reference is a notable tree approximately 1,000 years old. It was once hollow and 30 feet (9.1 m) in girth. In 1760 it had a door and a lock and was capable of sheltering "twenty boys". [19]
The Big Belly Oak (also known as The Big Bellied Oak) is an ancient oak tree in the Savernake Forest in Wiltshire, England. The Big Belly Oak is the oldest oak in the Savernake Forest; it was planted around the year 1000, making it approximately 1,000 years old. [ 1 ]
Electronics portal; This article is part of WikiProject Electronics, an attempt to provide a standard approach to writing articles about electronics on Wikipedia. If you would like to participate, you can choose to edit the article attached to this page, or visit the project page, where you can join the project and see a list of open tasks.
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