Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1984-06-26
1986-09-23
Tarcza, Thomas H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 766
Patent
active
046138625
ABSTRACT:
A method is described which provides automatic self synchronization (in time) between multiple pulse repetition frequency (PRF), pulse doppler radars. The synchronization technique time aligns data within a coherent look transmission (a group of pulses--typically milliseconds). This technique substantially eliminates sensitivity losses associated with blanking false alarms or detection from interfering radars transmitting (in time) at pulse repetition intervals (PRI) different than the host radar. An implementation of this method for a 2 PRF radar waveform is described although the technique may be extended to more than 2 PRF's. The technique provides an alternative approach to pulse shaping or multiple (different) frequencies to control MI but may be used in conjunction with these techniques to minimize sensitivity losses due to interference blanking. For applications where wide angular antenna beams are required and/or multiple simultaneous radar operation is required (e.g., airborne close aircraft formations or closely spaced ground warning radars), this technique is especially useful for MI control. This is especially true for a defensive radar system such as an active missile warning radar.
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K. H. Chase and J. L. Pierzga, Reducing Mutual Radar Interference, Electronics, Jul. 10, 1959, pp. 39-43.
Donahue Richard J.
Hayes, Jr. Donald E.
Singer Donald J.
Tarcza Thomas H.
The United States of America as represented by the Secretary of
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