| 摘要 |
<p>PURPOSE: To enhance analysis accuracy and to suppress the noise component by analyzing an input time wave based on combinations of a couple of orthogonal waveform components having plural element frequencies in the analysis of frequency and phase components included in a frame time length. CONSTITUTION: A received signal is demodulated into a base band signal by a local carrier, a frame signal Vt whose band width is limited by a filter is sampled into a digital quantity by a coder 1, a frame period expansion circuit 2 converts the digital signal into an expanded frame signal Vj and it is fed to a correlation device COR3, where correlation is processed by using the Vj and waveform information of full sine waves Ci of element frequencies stored in an arithmetic operation coefficient memory MEM5 to conduct correlation processing and to obtain arithmetic operation results UJ, VJ. On the other hand, the combination of unknowns Xj, Yj is obtained by an arithmetic unit QS4 based on a prescribed equation by the inter-correlation coefficient stored in the MEM5 and the Uj, Vj, resulting that power of the reception signal is not attenuated but detected as X. On the other hand, noise Yo subjected to band limit is discriminated at a high S/N by a receiver side discrimination circuit and the number of element frequencies is increased more, the S/N is more increased.</p> |
