Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Transmitter
Patent
1980-08-29
1990-03-06
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Transmitter
342131, G01S 1324
Patent
active
049070002
ABSTRACT:
A transceiver system of a frequency-agile Doppler radar comprises a transmission-side and a reception-side oscillator circuit both connected to a frequency-agility controller for concurrently varying their operating frequencies. Each of these oscillator circuits includes a high-frequency generator coupled via a frequency divider and a frequency multiplier to a pair of auxiliary mixers in a control loop of an associated microwave generator, the loop further including another frequency divider between the two mixers. The step-down ratios of the two frequency dividers of each oscillator circuit is adjustable by the frequency-agility controller. The microwave generator of the transmission-side oscillator circuit emits an outgoing signal to a duplexer connected to the radar antenna while incoming echoes are fed by the duplexer to a first principal mixer receiving a heterodyning signal from the microwave generator of the reception-side oscillator circuit. The reception-side high-frequency generator has a fixed operating frequency while its transmission-side counterpart is voltage-controlled by a phase loop including a second and a third principal mixer in cascade with each other. The second principal mixer receives the output signals of the two frequency multipliers while the third principal mixer introduces a frequency-transposition signal from a Doppler oscillator into that phase loop; the Doppler oscillator is controlled by a frequency discriminator receiving the output signal of the first principal mixer through a narrow-band filter.
REFERENCES:
patent: 4071844 (1978-01-01), Hopwood et al.
"Thomson-CSF"
Dubno Herbert
Tubbesing T. H.
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