介绍了某直接序列扩频、QPSK调制系统接收通道中四相Costas 载波跟踪环的原理及其基于 DSP+FPGA 的实现-Introduced a direct-sequence spread spectrum, QPSK modulation system, receive path Costas carrier tracking loop four-phase principle and its implementation based on DSP+ FPGA

该程序使用verilog语言，编写了QPSK-DSSS系统的发端，主要模块包括对同相分量和正交分量的扩频，通过根升余弦滤波器，以及与载波相乘等模块。-The program uses the verilog language, written QPSK-DSSS system, the originator, the main modules include in-phase and quadrature components of the spectrum, through the root

完成对干涉数据光谱反演的一系列操作：FFT及相位对齐参数的计算。-Completion of the interference spectrum inversion of the data series of operations: FFT and phase alignment parameter calculations.

Constituting the modulated signals of different frequencies, Channelized receiver based on multi-phase structure, Rotating machinery 2-d holographic spectrum calculation.