Design of Active Orthogonal Vector Detection System in Frequency Domain
Peng Wu · Electrical Measurement & Instrumentation · 2009
Based on FPGA and A/D chip,sin wave is generated to incite the system after power amplifier,with direct digital frequency synthesis(DDS) technology.Simultaneously,two orthogonal square waves as referential signals for PSDI and PSDII are produced to separate the real and imaginary components of the system response by using cross correlation.It realizes an orthogonal vector detection system.The theory and tested data prove that it can detect weak signal merged in noise,and have broad application prospects.