In the text,mainly introduce the numerical filter and the NCO of Cary Recovery COSTAS,and simply analyze the virtue and defect of FPGA chip so that the module can complete the function of Carry Recovery effectly.

• 主要对载波恢复COSTAS环法中的NCO与数字滤波器进行了介绍 ,并对FPGA芯片的优缺点进行了简单的分析 ,使该模块能有效的完成载波恢复功能。