Radar apparatus provided with a coherent clutter map
AssigneeHollandse Signaalapparaten B.V.
InventorsWietze J. H. Meijer, Petrus N. C. Nooy
Life of this patent
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Abstract
A radar apparatus provided with transmitter means (1), rotating antenna means (2) and receiver means (3) for the transmission per burst and the processing in a video processor of radar echo signals. The video processor includes moving target detection unit (4) provided with a doppler filter bank, for instance an FFT processor, and slow moving target detection unit (6), provided with coherent clutter maps, one map for each radar transmitter frequency used. The coherent clutter maps are also used for reducing the clutter strength of radar echo signals which are applied to the moving target detection unit (4), by subtracting the coherent clutter strengths stored in the clutter maps from the radar echo signals.
Claims12
A radar apparatus comprising:
- rotating antenna means;
- transmitter means connected to said rotating antenna means for generating and transmitting radar pulses;
- receiver means connected to said rotating antenna means for receiving, per transmitted pulse, a complex radar echo signal;
- a video processor connected to said receiver means, said video processor comprising a slow moving target detection unit provided with a clutter map divided into range-azimuth cells, means for measuring and storing complex clutter strengths corresponding to each range-azimuth cell of said clutter map, and comparison circuits for comparing a received complex radar echo signal for each range-azimuth cell with the measured complex clutter strength stored in the corresponding range-azimuth cell of said clutter map.
Dependencies are inferred from the claim text.