| 摘要 |
PURPOSE: To attain spread spectrum processing with high precision by facilitating data modulation/demodulation, detection of a Doppler frequency and discrimination of correlation with a simple circuit configuration. CONSTITUTION: A modulator 23 modulates data into a transmission pseudo noise signal, which is used to allow a spread device 22 to apply a 1st intermediate frequency signal, and when correlation is taken by an inverse spread device 33, a correlation output circuit 43, a data discrimination circuit 44 and a Doppler detection circuit 45 conduct simultaneously discrimination of correlation, data demodulation and detection of a Doppler frequency from the 1st intermediate frequency signal detected by an I-Q demodulation circuit 41 based on a 2nd intermediate frequency signal. |
