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In receiving antennas, sidelobes may pick up interfering signals, and increase the noise level in the receiver. The power density in the sidelobes is generally much less than that in the main beam. It is generally desirable to minimize the sidelobe level (SLL), which is measured in decibels relative to the peak of the main beam. The main lobe ...
Barker codes of length N equal to 11 and 13 are used in direct-sequence spread spectrum and pulse compression radar systems because of their low autocorrelation properties (the sidelobe level of amplitude of the Barker codes is 1/N that of the peak signal). [15]
For this result no weighting has been applied to the transmit pulse, but the full Hamming weighting has been applied in the compressor. As can be seen, the close-in sidelobe levels are consistent with the Hamming weighting (−42 dB), but further out, the sidelobe levels rise to a peak value of −45 dB at +/-T/2 each side of the main lobe. In ...
Figure 2: Windowing a sinusoid causes spectral leakage, even if the sinusoid has an integer number of cycles within a rectangular window. The leakage is evident in the 2nd row, blue trace. It is the same amount as the red trace, which represents a slightly higher frequency that does not have an integer number of cycles.
The "Cowboy Carter" collaborator is up for best new artist along with song of the year, best country song and best country solo performance for his smash hit "A Bar Song (Tipsy)" at the 2025 ...
Field Level Media. January 17, 2025 at 2:08 PM. May 1, 2023; New York City, New York, USA; Atlanta Braves relief pitcher A.J. Minter (33) follows through on a pitch against the New York Mets ...
With the help of magnets, metal detectors and magnifying lenses, investigators search for even the smallest pieces of evidence, such as fragments of molten machinery parts, match heads, glass and ...
[1] [2] [3] Particularly in the fields of fiber optics, lasers, and integrated optics, the term radiation pattern may also be used as a synonym for the near-field pattern or Fresnel pattern. [4] This refers to the positional dependence of the electromagnetic field in the near field, or Fresnel region of the source. The near-field pattern is ...