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The equalizer takes care of global phase offsets

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David Protzman 2022-08-28 01:08:25 -04:00
rodzic 95bc95e236
commit fe761e9473
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matlab/updated_scripts/process_file.m
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@ -137,13 +137,9 @@ for burst_idx=1:size(bursts, 1)
% Calculate the frequency needed to correct the integer offset, then conver that to radians
integer_offset = ((fft_size * interp_rate / 2) - center_offset + 1) * 15e3;
radians = 2 * pi * integer_offset / (file_sample_rate * interp_rate);
% The initial radians measurement was taken well into the burst. Applying this as is would cause an absolute phase
% offset. The logic below is meant to prevent that problem.
radians_scalar = [0:length(burst) - 1];% - offset;
% Apply a frequency adjustment
burst = burst .* exp(1j * radians * radians_scalar);
burst = burst .* exp(1j * radians * [0:length(burst) - 1]);
% Downsample (filter and decimate) the burst samples
burst = resample(burst, 1, interp_rate);