update README_CN.md.

Signed-off-by: 葛峻恺 <202115006@mail.sdu.edu.cn>

README_CN.md

@@ -145,6 +145,19 @@ pip install -r requirements.txt
 
 步骤9: 运行 7_network_train.py    将时间域反演结果转换为深度域结果。
 
+
+### 🙏 Acknowledgements
+
+We sincerely thank the developers of the following open-source tools used in this project:
+
+- **gprMax**: An open-source electromagnetic wave simulation software widely used for Ground Penetrating Radar (GPR) modeling and research.  
+- **readgssi**: An open-source Python tool designed to read and process GPR data collected by GSSI equipment.
+
+Both gprMax and readgssi are licensed under the GNU General Public License v3 (GPL-3.0), a strong copyleft license approved by the Open Source Initiative (OSI), and widely used in global and Chinese open-source communities.
+
+We are grateful for their contributions to the scientific and open-source ecosystem.
+
+
 ### 📝 参考文献
 
 若您在研究中使用本代码，请引用以下文献：