介绍采用微波混频器的上变频特性实现宽带平方电路的设计方法与具体实现，主要用于高码速率QPS K信号的载波恢复。
An introduction of the design and implementation of a broad-band square circuit is given, which is used to recover the carrier of the high speed QPSK signal.
阐述巴克码识别器的设计与FPGA的实现。
Elaborates the Barke code recognizer's design and FPGA realization.
本文的研究工作主要围绕着读码器的设计与实现展开，文中阐述了读码器硬件部分的设计；
The primary work of this thesis is about designing and realization of Preventing-Forgery Code Reader. It includes the hardware system designing;
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