how remove unwanted angle of arrivals for four channel microphone drone detection system

I need gudance for removing those frames which contain unwanted angle of arrivals i.e refelction from grounds, blue color are pure drone sound angle of arrivals,

how can i create an boolean array to filter out unnecessary Angle of arrivals, I used "eframe' to do framing and apply GCCPHAT for getting delays of sounds for each frames and finally calculate angles of sound source to microphone, now red color signals are due to reflection i want remove them, please researchers guide me.

angleNum = length(tau1);

angles = zeros(angleNum, 2);

for i = 1:angleNum

[theta, varphi] = angleGet(tau1(i), tau2(i), tau3(i));

angles(i, 1) = theta;

angles(i, 2) = varphi;

end

figure(5);

scatter(angles(:, 1), angles(:, 2));

[Amjad Iqbal]

angle_select = zeros(686,2);

for i = 1:686

if angles(i,2) >-90

angle_select(i,:) = angles(i,:);

end

end

angle_select(all(angle_select == 0,2),:) = [];

figure(6);

scatter(angle_select(:, 2), angle_select(:, 1));

index_angle = find(angles(:,2)>-90);

index_frame = index_angle+1;

T_select = T(index_frame);

Is this right way for removing those frames which contain unwanted angle of arrivals??