Doppler shift detector

Details Doppler shift detector Doppler shift detector

1997-12-18

1999-05-04

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

Determining velocity

Digital

342195, 367 90, 367 94, G01S 1316, G01S 702, G01S 1550

Patent

active

059008342

ABSTRACT:
A Doppler shift detector for determining the Doppler shift between a transmit signal and a receive signal uses clocked delay lines. The clocked delay lines count the number of edges in an applied signal thereto (e.g. the receive signal) at various positions in the delay line in accordance with a clock signal. Period detection logic ascertains the mean position of counted edges and thence the period of the applied signal. The Doppler shift is then calculated from the measured periods of the transmit signal and receive signal. The delay line for the receive signal is clocked by either the receive signal itself or the transmit signal.

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