HF arrangement

Details HF arrangement HF arrangement

1985-01-11

1987-07-21

Tubbesing, T. H.

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

With particular circuit

For pulse modulation

331 2, 331 5, 331172, G01S 728, H03B 910, H03L 724

Patent

active

046821783

ABSTRACT:
The invention relates to a coherent radar comprising a magnetron (10), a modulator (12) for pulsed driving if the magnetron, a stable local oscillator (22) and mixer (20) for producing an intermedicate frequency signal of incoming echoes and an intermediate frequency oscillator (28) and phase sensitive detector (26) for detecting the echo pulses in order to generate a so called bipolar video signal. According to the invention a HF-signal derived from the stable oscillator (22) is fed to the tuning cavities of the magnetron (10), so called priming, at least in the transmission moment, and furthermore the modulator (12) and the intermediate frequency oscillator (28) are mutually time controlled in such manner that the leading edge of the modulator pulse and thereby of the magnetron pulse always appears in a given phase position of the output signal from the intermediate frequency oscillator, for example a zero passage.

REFERENCES:
patent: 2586028 (1952-02-01), Grayson et al.
patent: 2901707 (1959-08-01), Kline et al.
patent: 2977589 (1961-03-01), Gutton
patent: 3020539 (1962-02-01), Gruenberg
patent: 4072944 (1978-02-01), Bianco et al.
patent: 4079378 (1978-03-01), Hulderman
Jordan, Comparison of Two Major Classes of Coherent Pulsed Radar Systems, IEEE Trans on Aerospace and Electronic Systems, vol. AES-11, No. 3, May 1975, pp. 363-371.
Radar Techniques, Sweden, 1978, p. 8-11, FIGS. 8, 9.

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