Airborne Radar Motion Compensation Techniques -- Evaluation of DPCA
NAVAL RESEARCH LAB WASHINGTON DC
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Coherent signal processing in an airborne radar is highly dependent upon methods used to compensate for platform e.g., airplane motion. Platform motion causes returns to have doppler shifts which vary with the angle between the velocity vector of the platform and that of the target or scatterer. Because of the finite antenna beamwidth and the finite transmitted pulse length, radar returns from many scatterers are received simultaneously from different angles. Therefore, these returns combine to give a spectrum of doppler frequencies which must be corrected. Displaced Phase Center Antenna DPCA is a technique which compensates for the component of motion which is perpendicular to the axis of the beam. This report evaluates DPCA in terms of its improvement to airborne moving target indicator MTI performance. It is shown that MTI performance is improved significantly with DPCA. However, since DPCA does not completely compensate for this motion, MTI performance can be limited by this technique under certain conditions.
- Electrical and Electronic Equipment
- Active and Passive Radar Detection and Equipment