Device for eliminating low frequency noise from a transmission s

Details Device for eliminating low frequency noise from a transmission s Device for eliminating low frequency noise from a transmission s

1985-12-03

1987-11-24

Tubbesing, T. H.

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

With particular circuit

For pulse modulation

342192, 375 57, G01S 728

Patent

active

047092378

ABSTRACT:
Device for eliminating the noise in 1/f from a Doppler radar comprising in the HF emitting system, a phase coder introducing, at frequency PRF/2 a phase shift of 0 and .pi. alternately, and in the receiving system, after the receiver, a decoder, or gain inverter progrmmable between -1 and +1, acting, in the same manner as the coder, upon the receiving signal and comprising a low-pass filter downstream from the decoder for eliminating the noise in 1/f, that appears at PRF/2, the device being applied to a ground surveying radar.

REFERENCES:
patent: 3332077 (1967-07-01), Nard et al.
patent: 4404562 (1983-09-01), Kretschmer, Jr. et al.
patent: 4439766 (1984-03-01), Kobayashi et al.
M. Skolnik, Intro. to Radar Systems; pp. 290-291; (McGraw-Hill, 1980).
NASA Techbrief, No. NTN83-0333, 1983 Lyndon B. Johnson Space Center, Houston, Tex. U.S. "Pulsed Phase Shifter Improves Doppler Radar".

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