Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-07-24
1981-02-03
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 77, G01S 728, G01S 1352
Patent
active
042491797
ABSTRACT:
A circuit for a pulse Doppler radar receiver in which a measuring signal for determining the mean frequency of disturbing low frequency received clutter signals is obtained from which there is determined a control signal for operating a circuit that precedes the clutter filter and serves to displace the clutter spectrum into the blocking ranges of the fixed clutter filter particularly for radar devices having a non-constantly scanning antenna and wherein the circuit for determining the mean change in the clutter phase is in parallel with a delay device which has a delay that extends over a number of radar periods and wherein the circuit for determining the mean change in the clutter phase is preceded by an adjustable phase shift device which is followed by an accumulator for the addition of phase change and wherein continuous adjustment of an adjustable phase shift device is accomplished with a return loop and in which a switch is provided between the circuit for determining the mean change in the clutter phase and the accumulator which is closed at the end of each radar period for the transmission of measuring values.
REFERENCES:
patent: 3742500 (1973-06-01), Freedman
patent: 3962704 (1976-06-01), Evans
patent: 4042924 (1977-08-01), Evans et al.
patent: 4093949 (1978-06-01), Evans
patent: 4132990 (1979-01-01), Di Domizio et al.
patent: 4137533 (1979-01-01), Briechle et al.
R. Voles, Effects of Noise in Clutter-Locking MTI Systems, Proc. IEE, vol. 122, No. 7, Jul. 1975, pp. 689-692.
R. Voles, Losses Due to the Error in Estimating the Velocity in Clutter-Locking MTI Systems, IEEE Trans. on Aerospace & Electronics, Nov. 1973, pp. 950-953.
V. G. Hansen et al.; Adaptive Digital MTI Signal Processing, IEEE Eascon Conference Record, Sep. 1973, pp. 170-176.
R. Roy et al., Velocity Adaptive MTI Filter, IEEE Trans. on Aerospace and Electronic Systems, Mar. 1973, pp. 324-326.
Siemens Aktiengesellschaft
Tubbesing T. H.
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