Digital tracking filter-processor for processing Doppler signals of alternating SPEED

摘要

Tracking filter processor for processing Doppler velocity alternating signal for use in devices for contactless remote measurement of liquid flow rates and gas, as well as the diffusely reflecting solid objects. Filter processor comprises two quadrature channels for processing the input signals. Each quadrature channel consists of two mixers, a combiner output signals of mixers coupled to the low-pass filter connected to the series-connected device and sampling and storing the signal corresponding switch channel. The structure of a tracking filter also includes analog-to-digital converter connected with its input to the output switch, a tunable frequency quadrature generator, a microprocessor and an interface unit connected via a common bus to a microprocessor. The proposed device, due to the fact that in each quadrature channel additionally introduced second mixer and the adder, the measurement of Doppler velocity and its sign is produced in a wide frequency range, including the zero frequency.; The formula contains 1 independent claim 1, fig.