Because of the low transmitted power levels that are feasible in the extremely low frequency (ELF) band, it is essential to exploit such noise excision methods as are available to maximize communications signal‐to‐noise ratio (snr). A method that employs wideband clipping on ELF noise to match it to a linear matched filter has been evaluated with the use of noise data from northern latitude receiving sites. The analysis of month‐long samples of noise data from all seasons and nearly all times of day indicates that an improvement in snr of at least 10 dB can be realized nearly all the time with the use of one or two parallel, manually adjusted clippers whose clipping levels are set on the basis of seasonal mean noise level.
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J. Davis (1976) studied this question.
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