Digital loop filter

Details Digital loop filter Digital loop filter

1982-12-27

1985-12-31

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343442, 328167, 364724, G01S 130

Patent

active

045624372

ABSTRACT:
A digital loop filter is used in a phase-tracking circuit which is adaptable to a phase-comparison radio navigation system such as the DECCA (registered trademark) system. The digital loop filter includes a feedback circuit which receives a digital input signal from the digital loop filter and outputs a digital output signal and which feeds back and adds the digital output signal to the digital input signal after a predetermined delay. It also includes a feed-forward circuit which multiplies the digital input signal by a predetermined constant (B) and adds the resultant signal to the digital output signal of the feedback circuit to generate a digital output signal. A multiplier for multiplying the digital output signal of the feed-forward circuit by a second predetermined constant (C) to generate a digital output signal of the digital loop filter is also provided.

REFERENCES:
patent: 4027264 (1977-05-01), Gutleber
patent: 4032857 (1977-06-01), Lum
patent: 4086539 (1978-04-01), Gustafson et al.
patent: 4477919 (1984-10-01), Borras et al.
Proceedings of the IEEE, "Radar and Gold: Digital Filter Design Techniques", Feb. 1967, pp. 150-151.
IEEE Transactions on Acoustics, Speech and Signal Processing, Apr. 1975, pp. 238-239, Dec. 1975, pp. 560-561.

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