Add Example

2024-11-11 16:32:53 +08:00
parent a2cb6d1825
commit 29ae9585f9
56 changed files with 4029 additions and 0 deletions
@@ -0,0 +1,31 @@
+function [ echo_sFFT_mtx, angle_index ] = spatial_FFT(echo_mtx, d, lambda)
+% FFT for echo space domain
+%
+% Usage: 
+% [echo_sFFT_mtx, angle_index] = spatial_FFT(echo_mtx, d, lambda)
+%
+% Inputs:
+%   echo_mtx:     Matrix containing the echo data
+%   d:            Antenna spacing
+%   lambda:       Wave length
+%
+% Outputs:
+%   echo_sFFT_mtx:  Processed echo matrix
+%   angle_index:    True value of the angle
+
+
+    % parameters
+    [lenA, lenR, lenP] = size(echo_mtx);
+    
+    % calculate angle
+    angle_index = asin(-1 * (-1/2: 1/lenA: 1/2 - 1/lenA) * lambda / d) / pi * 180;
+    
+    % spatial FFT
+    echo_mtx = reshape(echo_mtx, [lenA, lenR * lenP]);
+    echo_sFFT_mtx = zeros(size(echo_mtx));
+    for i = 1: lenR * lenP
+        echo_sFFT_mtx(:, i) = fftshift(fft(echo_mtx(:, i))) ./ sqrt(lenA);
+    end
+    echo_sFFT_mtx = reshape(echo_sFFT_mtx, [lenA, lenR, lenP]);
+    
+end