Bug fixes (tropo coeff data block and time offset)

- The number of parameters to be consider in zdb023 is the number of orders (i.e., the maximum order + 1) and not the number of coefficients.
- the time offset in zdf057 is defined exactly by zdf057 and not plus 1

src/ssrz_blocks.py

@@ -1560,7 +1560,7 @@ def __init__(self, msg, unpacked_bits, zdf107_bit0=False):
         n_coeff_triangle = compute_ncoeff_from_order_triangle(self.m_hor)
         self.n_coeff = (self.m_hgt + 1) * n_coeff_triangle
         # Compressed coefficients block definition of regional tropo component
-        self.blk = zdb023(msg, unpacked_bits, self.n_coeff)
+        self.blk = zdb023(msg, unpacked_bits, self.m_hor + 1)
         unpacked_bits = self.blk.unpacked_bits
         # Separated compressed coeff block per height
         if zdf107_bit0:

src/ssrz_fields.py

@@ -478,11 +478,11 @@ def zdf056(msg, unpacked_bits):
 
 def zdf057(msg, unpacked_bits):
     """ SSR update interval offset of an SSR update interval.
-        T_offset = ZDF057 + 1
+        T_offset = ZDF057
     """
     [pr_code, num, bits_zdf057] = prefix_coding(msg, 6, 0,
                                                 unpacked_bits=unpacked_bits)
-    t_offset = num + 1
+    t_offset = num
     return [t_offset, bits_zdf057]