Communications: directive radio wave systems and devices (e.g. – Clutter elimination – Mti
Patent
1983-10-17
1986-10-07
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
Mti
342194, G01S 1352, G01S 728
Patent
active
046162283
ABSTRACT:
A receiving section of a surveillance radar equipped with a power oscillator in its transmitting section comprises several registers for the storage of values, perferably in complex digital form, representing the starting phase of a continuous wave at the instant of transmission of an outgoing pulse, these values being used thereafter to establish coherence with an incoming echo pulse at a time when the power oscillator is no longer able to do so on account of unavoidable frequency drifts or because of intervention of a new recurrence period. Thus, the stored values permit the correct detection of targets at the far end of the range and/or the cancellation of second-time-around clutter echoes. The continuous wave may be generated by a coherent oscillator, phase-locked during each recurrence period by the outgoing pulse, or a separate crystal-controlled oscillator of highly stable frequency.
REFERENCES:
patent: 4021804 (1977-05-01), Dounce et al.
patent: 4119962 (1978-10-01), Lewis
patent: 4214242 (1980-07-01), Colin
patent: 4217584 (1980-08-01), Lombardi et al.
Galati Gaspare
Giaccari Ennio
Dubno Herbert
Hellner Mark
Ross Karl F.
Selenia - Industrie Elettroniche Associate - S.p.A.
Tubbesing T. H.
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