Quadrature phase processing

Details Quadrature phase processing Quadrature phase processing

1993-01-13

1994-11-15

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

324118, 342127, 342135, 327 3, 327238, G01S 1350

Patent

active

053651847

ABSTRACT:
A phase modulated signal is split into quadrature components Savg+SaSin(.phi.(t)+kx(t)) and Cavg+CaCos((.phi.(t)+kx(t)). The average value for each signal is compared with the signal to produce a data bit whose meaning is that the average value was exceeded at a sampling instant. The bits at successive times (t.sub.0 and t.sub.1) are separated by an interval set by the Nyquist rate on the peak rate of change of the phase for the signal. Four bits at two sample times t.sub.0 and t.sub.1 are processed to determine the phase quadrants modulo 360 degrees to determine the direction of the phase change. The determination is used to produce a counter enable signal, counter direction control signal (up/down) and optionally an error signal if the phase change during one clock period is more than plus or minus one quadrant. A tracking counter counts the number of quadrants of change from those signals.

REFERENCES:
patent: 3766555 (1973-10-01), Watt
patent: 3854133 (1974-12-01), Cabion
patent: 4238795 (1980-12-01), Schiek et al.
patent: 4475088 (1984-10-01), Beard
patent: 4477773 (1984-10-01), Margerum
patent: 4748348 (1988-05-01), Thong
patent: 4949364 (1990-08-01), Yukawa
patent: 5113191 (1992-05-01), Knepper et al.

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