diff --git a/RSP/parse_rinex.py b/RSP/parse_rinex.py
index 053da2f..ccad100 100644
--- a/RSP/parse_rinex.py
+++ b/RSP/parse_rinex.py
@@ -173,6 +173,7 @@ def _next_line(rinex_file: TextIOWrapper) -> list:
 
 def _extract_data(rinex_file: TextIOWrapper) -> dict:    
     ext_data = {}
+    nr_sat = 0
     while True:
         try:
             str_data = []
@@ -180,16 +181,19 @@ def _extract_data(rinex_file: TextIOWrapper) -> dict:
             for _ in range(8):
                 str_data.append(_next_line(rinex_file))
             
-            ex_data_l1 = _read_PRN_EPOCH_SV_CLK(str_data[0])
             
-            ext_data[str(ex_data_l1['PRN'])] = ex_data_l1
-            ext_data[str(ex_data_l1['PRN'])].update(_read_BROADCAST_ORBIT_1(str_data[1]))
-            ext_data[str(ex_data_l1['PRN'])].update(_read_BROADCAST_ORBIT_2(str_data[2]))
-            ext_data[str(ex_data_l1['PRN'])].update(_read_BROADCAST_ORBIT_3(str_data[3]))
-            ext_data[str(ex_data_l1['PRN'])].update(_read_BROADCAST_ORBIT_4(str_data[4]))
-            ext_data[str(ex_data_l1['PRN'])].update(_read_BROADCAST_ORBIT_5(str_data[5]))
-            ext_data[str(ex_data_l1['PRN'])].update(_read_BROADCAST_ORBIT_6(str_data[6]))
-            ext_data[str(ex_data_l1['PRN'])].update(_read_BROADCAST_ORBIT_7(str_data[7]))
+
+            ex_data_l1 = _read_PRN_EPOCH_SV_CLK(str_data[0])
+            key = f"{nr_sat}_{str(ex_data_l1['PRN'])}"
+            nr_sat += 1
+            ext_data[key] = ex_data_l1
+            ext_data[key].update(_read_BROADCAST_ORBIT_1(str_data[1]))
+            ext_data[key].update(_read_BROADCAST_ORBIT_2(str_data[2]))
+            ext_data[key].update(_read_BROADCAST_ORBIT_3(str_data[3]))
+            ext_data[key].update(_read_BROADCAST_ORBIT_4(str_data[4]))
+            ext_data[key].update(_read_BROADCAST_ORBIT_5(str_data[5]))
+            ext_data[key].update(_read_BROADCAST_ORBIT_6(str_data[6]))
+            ext_data[key].update(_read_BROADCAST_ORBIT_7(str_data[7]))
 
         except EndOfFile:
             print("End of file")
diff --git a/RSP/satpos.py b/RSP/satpos.py
index 9c45f8c..3dfc673 100644
--- a/RSP/satpos.py
+++ b/RSP/satpos.py
@@ -56,10 +56,10 @@ def calculate_satpos(sat_rinex: dict) -> tuple:
 def calculate_positions(sat_data: dict) -> dict:
     sat_pos = {}
 
-    for _, sat_rinex in sat_data.items():
+    for key, sat_rinex in sat_data.items():
         xk, yk, zk = calculate_satpos(sat_rinex)
 
-        sat_pos[str(sat_rinex['PRN'])] = {
+        sat_pos[key] = {
             'x': xk,
             'y': yk,
             'z': zk
diff --git a/example.py b/example.py
index 66c2513..cedba93 100644
--- a/example.py
+++ b/example.py
@@ -1,7 +1,7 @@
 from RSP.parse_rinex import read_rinex
-from RSP.satpos import calculate_positions
+from RSP.satpos import calculate_satpos, calculate_positions
 
 
-sat_data = read_rinex('./test/940779338I_1.17N')
+sat_data = read_rinex('./test/gmez0380.21n')
 sat_pos = calculate_positions(sat_data)
-print(sat_pos)
\ No newline at end of file
+print(sat_pos)