MTI Radar adaptable to different environmental conditions

Details MTI Radar adaptable to different environmental conditions MTI Radar adaptable to different environmental conditions

1981-07-08

1985-01-29

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 177R, 343 18E, G01S 1352

Patent

active

044969490

ABSTRACT:
A radar of the MTI type has a transmitter connected to a source of outgoing pulses whose carrier frequency is variable under the control of a mode selector for selective operation with fixed frequency, frequency diversity or frequency agility, depending on detected environmental conditions. A multiweight Doppler filter serves for the detection of mobile targets in each of these three modes. With frequency-agility operation, samples of echoes of an outgoing pulse received during a given sweep are stored in a memory in accordance with the carrier frequency used for that pulse, this frequency changing in random fashion from one pulse to the next among a certain number of predetermined values. A timer selecting the outgoing frequency also controls a multiplexer which during each sweep delivers to the Doppler filter up to m correlated samples of the same frequency stored in the memory during the last n sweeps, with n>m determined by the width of the antenna beam to ensure that the samples concurrently evaluated by the filter come from the same target.

REFERENCES:
patent: 3716859 (1973-02-01), Webb et al.
patent: 3725926 (1973-04-01), Ares
patent: 4038659 (1977-07-01), Hamer et al.
patent: 4339604 (1982-07-01), Petitjean
patent: 4339754 (1982-07-01), Hammers et al.
Paul W. Howells, "Explorations in Fixed and Adaptive Resolution at GE and SURC", IEE Transactions on Antennas and Propagation, vol. Ap-24, No. 5, Sep. 1976, pp. 575-584.

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