| 摘要 |
PURPOSE:To attain the measurement of multi-path at a high speed even under the measuring environment where a change in the multi-path is frequent by applying complex correlation detection to a pseudo random code series in an input spread spectrum signal. CONSTITUTION:The input spread spectrum signal enters multipliers 11, 12, where the signal is multiplied with outputs of a voltage controlled oscillator 29 and a 90 deg. phase shifter 30 and the result is converted into an orthogonal base band signal and given to correlation devices 13, 14 for detecting correlation. Adders 15, 16, frame memories 17, 18 and weighting circuits 19, 20 constitute a cyclic integration circuit over one frame of the input spread spectrum signal and selects the weight coefficient to set the S/N improvement quantity of the output of the correlation devices 13, 14 optionally. The output of the frame memories 17, 18 is converted into a signal of the polar coordinate by square devices 21, 22, an adder 24, a root circuit 25 and an arc tangent function device 23 and the result is outputted as the amplitude and phase component of the multi-path signal. |
