Update README.md

README.md

@@ -1,37 +1,39 @@
-# This program code is solely for study and communication purposes #
+# **MAIN FUNCTION INTRODUCTION**
 
-# Main function introduction：
-
-1.Reads the specified observation data and navigation data.
-2.Calculate and document the longitude and latitude coordinates and height of the satellite at each epoch time.
-3.With the help of PyGMT, the output document information is processed and the satellite ground track map is drawn.
-4.With the help of MatLab tool, the satellite position is calculated and the station position is obtained by simultaneous solution, 
-  and the precision is evaluated by comparing with the coordinates of the precise station.
+* Reads the specified observation data and navigation data.
+* Calculate and document the longitude and latitude coordinates and height of the satellite at each epoch time.
+* With the help of PyGMT, the output document information is processed and the satellite ground track map is drawn.
+* With the help of MatLab tool, the satellite position is calculated and the station position is obtained by simultaneous solution,   
+  and the precision is evaluated by comparing with the coordinates of the precise station.  
 
 # MAIN NOTICE
 
-## program notice
-  ### about main calculate
-  1.Due to the lack of program writing experience, 
-    the ease of file reading is not perfect, 
-    if you need to read other observation files and navigation files, 
-    you can make changes in the main.c file.
-  ### about PyGMT
-  1.I have improved the drawing part of PyGMT 
-    to ensure that the output data can be used independently.
-  ### about Matlab
-  1.When the new station data is needed for calculation, 
-    two parts of parameters in the Matlab source file need to be corrected, 
-    the first is the exact coordinates of the station in the file header, 
-    and the second is the longitude, latitude and elevation information of the station in the file header
+## Program notice
+  ### About main calculate
+  * Due to the lack of program writing experience,   
+    the ease of file reading is not perfect,   
+    if you need to read other observation files and navigation files,   
+    you can make changes in the ***main.c*** file.  
+  ### About PyGMT
+  * I have improved the drawing part of PyGMT     
+    to ensure that the output data can be used independently.    
+  ### About Matlab
+  * When the new station data is needed for calculation,     
+    two parts of parameters in the Matlab source file need to be corrected,   
+    the first is the exact coordinates of the station in the file header,   
+    and the second is the longitude, latitude and elevation information of the station in the file header  
 
 ## Project notice
-1.Due to my limited programming level, PyGMT drawing used too miscellaneous judgment statements, 
+* Due to my limited programming level, PyGMT drawing used too miscellaneous judgment statements,   
   resulting in slow drawing or debugging errors, please forgive me.
-2.When writing the code, with the help of the existing open source code results, 
-  and different degrees of reference, here one by one mark and express thanks:
+* When writing the code, with the help of the existing open source code results,   
+  and different degrees of reference, here one by one mark and express thanks:  
   
-  ||****|| https://blog.csdn.net/why1472587?type=blog               ||****||
-  ||****|| https://zhuanlan.zhihu.com/p/416072448                   ||****||
-  ||****|| https://www.pygmt.org/latest/index.html                  ||****||
-  ||****|| https://blog.csdn.net/FrankXCR/article/details/135438701 ||****||
+  | https://blog.csdn.net/why1472587?type=blog               
+  | https://zhuanlan.zhihu.com/p/416072448                   
+  | https://www.pygmt.org/latest/index.html                  
+  | https://blog.csdn.net/FrankXCR/article/details/135438701
+
+  
+  
+### *This program code is solely for study and communication purposes* ###