Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1987-08-11
1989-04-25
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342165, G01S 1332
Patent
active
048252140
ABSTRACT:
The radar includes a linearly frequency-modulated microwave frequency signal generator (1), a transmitter-receiver antenna (2) and coupling means (3, 6; 48) in order to sample a local oscillation signal and an echo signal and in order to transmit these two signals to the inputs of a mixer (5) which provides at its output a subtractive beat signal between these two signals. The line lengths are adjusted in order to produce a static adjustment of the phase between the local oscillation signal and the interference antenna reflection signal. A phase control loop including an amplifier (36) and a low-pass filter (37) is connected between the output of the mixer and an input of a phase-shifting circuit (35; 54) placed in the local oscillation channel; the closed control loop cut-off frequency is just below the frequency of the subtractive beat signal.
REFERENCES:
patent: 2147810 (1939-02-01), Alford
patent: 2520553 (1950-08-01), Lawson
patent: 3229286 (1966-01-01), Samuel et al.
patent: 3256520 (1966-06-01), Blitz
patent: 3605094 (1971-09-01), Peperone
patent: 3735402 (1973-05-01), Mosher
patent: 4682175 (1987-07-01), Lazarus
Skolnik, "Introduction to Radar Systems", 1980, McGraw-Hill, pp. 72-73.
Hellner Mark
Kraus Robert J.
Tarcza Thomas H.
U.S. Philips Corporation
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