| 摘要 |
PURPOSE: To evaluate the influence of phasing, estimated propagation and antenna directivity as well in a comparatively short time. CONSTITUTION: A non-modulated carrier wave from a signal generating part 23 is received by a receiver 31, the received output is orthogonally detected, those IQ data are recorded by a recorder 45 and at the same time, the moving speed signal of the moving receiver 31 or signal generating part 23 at that time is recorded as well. These recorded data are stored in a data base 48 and read out of the data base 48 by a work station 47 when testing a modulator 43. While referring to the speed signal for the IQ data, the phasing data at a desired Doppler frequency are prepared, these data are phased by performing orthogonal product modulation to a signal from a transmitting part 41 corresponding to phasing data 42, and that output is supplied to the demodulator 43 to be evaluated. |
