Add Radar simulation

2024-05-09 16:48:41 +08:00
parent c57d8588e3
commit 392f83b068
29 changed files with 409 additions and 56 deletions
@@ -0,0 +1,47 @@
+function velocity = get_velocity(s_T, s_R, origin_velocity)
+    global T_r delta_t c f_c max_t slow_len;
+    freq_s_T = 1 / T_r;
+
+    slow_freqs = ((0:slow_len - 1) * (1 / T_r)) / slow_len;
+    range_t_slow = 1:slow_len;
+
+    num_slow = max_t / T_r;
+    s_R_slow = zeros(1, slow_len);
+    k = floor(T_r / delta_t);
+
+    idx = 1;
+
+    while abs(s_R(idx)) == 0
+        idx = idx + 1;
+    end
+
+    for i = 0:num_slow - 1
+
+        while abs(s_R(idx + i * k)) == 0
+            idx = idx + 1;
+        end
+        s_R_slow(i + 1) = s_R(idx + i * k);
+    end
+
+    s_R_fft = fft(s_R_slow);
+    [~, max_index_s_R] = max(s_R_fft);
+    freq_s_R = slow_freqs(max_index_s_R);
+
+    % figure(2);
+    % subplot(2, 1, 1);
+    % plot(range_t_slow, abs(s_R_slow));
+    % title(sprintf('s_R'));
+    % subplot(2, 1, 2);
+    % plot(slow_freqs, abs(s_R_fft));
+    % title(sprintf('s_R_fft, freq = %E', freq_s_R));
+    % xlabel('频率 (Hz)');
+
+    f_d = freq_s_T - freq_s_R;
+    velocity = (c * f_d) / (2 * f_c);
+
+    fprintf("predict velocity: %f\n", velocity);
+    fprintf("origin velocity: %f\n", origin_velocity);
+    fprintf("err = %f\n", velocity - origin_velocity);
+    fprintf("\n");
+
+end