chirp

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chirp

[chərp]
(communications)
An undesirable variation in the frequency of a continuous-wave carrier when it is keyed.
The sound heard in a code receiver when the transmitted carrier frequency is increased linearly for the duration of a pulse code.
References in periodicals archive ?
In Section 4, we will inspect the inaccuracies of the elements on chirped pulse generation.
A chirp-free baseband pulse passed through a photonic microwave filter with a quadratic phase response can produce a chirped microwave pulse at the filter output [11].
N is the number of filter taps required for the generation of the chirped pulse and M is the number of antennas.
MN] representing the mean value of all MN wavelengths in Figure 2 and T representing the mean time period of the chirped pulse, [chi] could be chosen as follows:
IPR measurement, also known as time sidelobe measurement, is an effective method for verification of the performance of frequency chirped pulses and offers more detail and insight than either frequency vs.
NIST also employed a new, low-coherence interferometer method to determine the RGD of the chirped grating.
From the RGD data, the linear slope of the chirped grating was determined from data within the -3 dB reflectance bandwidth (determined from a robust method described in Appendix F) using a least-squares fit.
In this section a history of the center wavelength of each of the telecom gratings and the linear slope of the RGD of the chirped grating is given as a function of time.
Figure 8 shows the - 3 dB center wavelength versus time for the telecom chirped grating.
As shown in Figure 3, the chirped signal is present in the bandwidth of an information-bandwidth receiver for only a small fraction of the required time.
For example, assume that the information bandwidth is 10 kHz and that the signal is chirped across 10 MHz at a rate of one linear sweep per msec.
The vulnerability of chirped signals to detection is that their full signal power passes through every frequency within its chirp range.