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A linear chirp waveform; a sinusoidal wave that increases in frequency linearly over time. 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]
When the frequency is a linear function of time, the phase is a quadratic function, and s(t) can be written ... (A linear chirp, on the other hand, has a nominally ...
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 advantages [4] of the Barker codes are their simplicity (as indicated above, a de-phasing is a simple sign change), but the pulse compression ratio is lower than in the chirp case and the compression is very sensitive to frequency changes due to the Doppler effect if that change is larger than .
Only when chirp time-bandwidth products are very high, say well over 2000, is it necessary consider a sweep-frequency law other than linear, to cope with Doppler frequency shifts. A Doppler tolerant characteristic is the linear-period (i.e. hyperbolic) modulation of the chirp, and this has been discussed by several authors, [ 19 ] [ 20 ] as was ...
Chirping, the act of signaling with chirps, signals in which the frequency increases / decreases with time Chirping, pulse compression by linear frequency modulation Trash-talk in ice hockey
Sweep generator in Lawrence Livermore National Laboratory, 1950. A sweep generator is a piece of electronic test equipment similar to, and sometimes included on, a function generator which creates an electrical waveform with a linearly varying frequency and a constant amplitude.
The chirp Z-transform ... the sequence b n from above is a complex sinusoid of linearly increasing frequency, which is called a (linear) chirp in radar systems. ...