频偏与判决门限对数字匹配滤波器的捕获性能影响巨大,因此研究实现抗频偏算法及自适应门限调整策略对捕获有非常重要的意义。文章设计实现了适合FPGA实现的基于数字匹配滤波器的时频二维搜索算法和自适应门限调整策略并且在FPGA上实现。 Frequency offset and decision threshold have a great influence on the acquisition performance of digital matched filter. Therefore, it is very important to study the anti-frequency offset algorithm and adaptive threshold adjustment strategy to capture. The paper designs a time-frequency two-dimensional search algorithm and adaptive threshold adjustment strategy based on digital matched filter which is suitable for FPGA implementation and is implemented in FPGA.