Accession Number : ADD012552

Title :   Adaptive Mutual Interference Suppression Method.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : O'Donnell,Bernard N

Report Date : 23 Sep 1986

Pagination or Media Count : 14

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 as an active missile warning radar. (Author)

Descriptors :   *PATENTS, *DOPPLER RADAR, *RADIOFREQUENCY INTERFERENCE, *PULSE RATE, *SUPPRESSORS, SYNCHRONIZATION(ELECTRONICS), RADAR SIGNALS, ADAPTIVE SYSTEMS, REPETITION RATE, FORMATION FLIGHT, AIRCRAFT, AIRBORNE, TRANSMITTANCE, FREQUENCY, SYNCHRONISM, WAVEFORMS, LOSSES, COHERENCE, APPROACH, DETECTION, SENSITIVITY, CONTROL, TIME, SHAPE, AUTOMATIC, PULSES

Subject Categories : Active & Passive Radar Detection & Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE