correlation in TDOA LOCALIZATION

function [ reliability ] = corr_reliability( correlation )

%corr_reliability calculates reliability 0..1 of the correlation result

% Looks for 2nd highest outstanding PEAK (not sample!) and returns "1 - amplitude percentage in comparison to main peak"

% e.g. main peak 10, 2nd peak 3 -> output: 0.7

[corr_max, idx] = max(correlation);

correlation_temp = correlation;

correlation_temp(idx) = 0;

bin_right_old = corr_max;

for ii=idx+1:1:length(correlation) % delete all decreasing values on right side

if (correlation_temp(ii) < bin_right_old)

bin_right_old = correlation_temp(ii);

correlation_temp(ii) = 0;

else

break;

end

end

bin_left_old = corr_max;

for ii=idx-1:-1:1 % delete all decreasing values on left side

if (correlation_temp(ii) < bin_left_old)

bin_left_old = correlation_temp(ii);

correlation_temp(ii) = 0;

else

break;

end

end

peak2 = max(correlation_temp); % look for 2nd (real) peak

reliability = 1-(peak2 / corr_max);

end

this is a function.i want to know what this function is actually doing.