First commit after changed file framework

pyat/cscore.py

@@ -0,0 +1,32 @@
+import numpy as np
+
+
+# 函数
+def dis_mats(m, d):  # 以线阵为例
+    dis = np.zeros((m, m))
+    for i in range(m):
+        D = np.arange(0, m * d, d) - d * int(i) * np.ones(m)
+        dis[i] = D
+    dis = np.triu(dis)
+    dis += dis.T - np.diag(dis.diagonal())
+
+    return dis   # 所有阵元的间距的集合
+
+
+def pn_funcs(f, c, dis):  # 所有阵元的噪声相关性
+    k = 2 * np.pi * f / c
+    # pn = np.sinc(k * dis)
+    a = np.sin(k * dis)
+    b = k * dis
+
+    pn = np.divide(a, b, np.ones_like(a), where=b != 0)  # sin0/0=1
+
+    return pn
+
+
+def ag_funcs(m, pn):
+    ps = np.power(m, 2)
+    ag_s = ps / np.sum(pn)  #
+    ag = 10 * np.log10(ag_s)
+
+    return ag