Research Article
Spot-Centroid Determination Algorithms in Semiactive Laser Photodiodes for Artillery Applications
Table 1
Relationship angles between ideal and calculated spot center position.
| | Ideal (deg) | Method 1 (deg) | Method 2 (deg) | Method 3 (deg) | Method 4 (deg) |
| | — | — | Spot-detector ratio | | — | — | 0.25 | 0.50 | 0.75 | 1.00 | 0.25 | 0.50 | 0.75 | 1.00 | 0.25 | 0.50 | 0.75 | 1.00 | 0.25 | 0.50 | 0.75 | 1.00 | | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | 0.1 | 30.6 | 31.0 | 30.7 | 30.6 | 30.2 | 29.8 | 30.4 | 30.5 | 30.1 | 28.3 | 30.1 | 30.4 | 30.8 | 30.6 | 30.6 | 30.6 | 30.8 | | 0.1 | 60.1 | 59.8 | 60.0 | 60.1 | 60.6 | 60.9 | 60.3 | 60.2 | 60.6 | 62.5 | 60.7 | 60.4 | 59.9 | 60.2 | 60.1 | 60.1 | 59.9 | | 0.1 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | 0.2 | 30.6 | 32.1 | 30.9 | 30.7 | 29.7 | 26.7 | 29.8 | 30.3 | 29.7 | 19.3 | 28.3 | 29.6 | 30.9 | 30.7 | 30.6 | 30.6 | 31.0 | | 0.2 | 60.1 | 58.5 | 59.8 | 60.0 | 61.0 | 64.1 | 60.9 | 60.5 | 61.1 | 71.7 | 62.5 | 61.1 | 59.8 | 60.0 | 60.2 | 60.1 | 59.7 | | 0.2 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | 0.0 | 0.0 | 0.0 | | 0.3 | 30.6 | 36.0 | 31.4 | 30.1 | 29.3 | 0.0 | 28.7 | 29.1 | 29.1 | 0.0 | 25.0 | 28.0 | 30.9 | NaN | 30.5 | 30.1 | 31.3 | | 0.3 | 60.1 | 54.5 | 59.3 | 60.6 | 61.4 | 90.0 | 62.1 | 61.7 | 61.6 | 90.0 | 65.8 | 62.8 | 59.8 | NaN | 60.2 | 60.6 | 59.4 | | 0.3 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | 90.0 | 90.0 | 90.0 | | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | 0.0 | 0.0 | 0.0 | | 0.4 | 30.6 | 42.2 | 32.2 | 28.9 | 28.9 | 0.0 | 26.7 | 27.1 | 28.6 | 0.0 | 19.3 | 26.0 | 30.7 | NaN | 30.7 | 29.7 | 31.5 | | 0.4 | 60.1 | 48.2 | 58.5 | 61.9 | 61.8 | 90.0 | 64.1 | 63.7 | 62.2 | 90.0 | 71.6 | 64.9 | 60.0 | NaN | 60.0 | 61.0 | 59.2 | | 0.4 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | 90.0 | 90.0 | 90.0 | | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | 0.0 | 0.0 | 0.0 | | 0.5 | 30.6 | 45.0 | 33.4 | 28.3 | 28.6 | 45.0 | 22.7 | 25.5 | 27.9 | NaN | 9.1 | 23.9 | 30.3 | NaN | 34.2 | 29.9 | 31.8 | | 0.5 | 60.1 | 45.1 | 57.2 | 62.4 | 62.2 | 90.0 | 68.3 | 65.3 | 62.9 | 90.0 | 81.8 | 67.0 | 60.4 | NaN | 55.7 | 60.8 | 58.9 | | 0.5 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | 90.0 | 90.0 | 90.0 | | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | NaN | 0.0 | 0.0 | | 0.6 | 30.6 | 45.0 | 35.2 | 28.1 | 28.2 | 45.0 | 0.0 | 23.8 | 27.1 | NaN | 0.0 | 20.6 | 29.6 | NaN | NaN | 30.4 | 32.1 | | 0.6 | 60.1 | 45.0 | 55.3 | 62.7 | 62.6 | 45.0 | 90.0 | 67.1 | 63.7 | NaN | 90.0 | 70.3 | 61.2 | NaN | NaN | 60.3 | 58.6 | | 0.6 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | NaN | 90.0 | 90.0 | | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | NaN | 0.0 | 0.0 | | 0.7 | 30.6 | 45.0 | 38.1 | 28.1 | 27.9 | 45.0 | 0.0 | 21.3 | 26.1 | NaN | 0.0 | 15.0 | 28.3 | NaN | NaN | 32.0 | 32.4 | | 0.7 | 60.1 | 45.0 | 52.5 | 62.7 | 62.9 | 45.0 | 90.0 | 69.5 | 64.7 | NaN | 90.0 | 75.9 | 62.5 | NaN | NaN | 58.7 | 58.2 | | 0.7 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | NaN | 90.0 | 90.0 | | 0.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | NaN | NaN | 0.0 | | 0.8 | 30.6 | 45.0 | 40.9 | 28.5 | 27.6 | 45.0 | 0.0 | 17.2 | 24.9 | NaN | 0.0 | 5.7 | 26.1 | NaN | NaN | 45.0 | 32.9 | | 0.8 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | NaN | NaN | 45.0 | 45.0 | NaN | NaN | 45.0 | 45.0 | | 0.8 | 60.1 | 45.0 | 49.7 | 62.2 | 63.2 | 45.0 | 90.0 | 73.8 | 66.0 | NaN | 90.0 | 85.1 | 64.8 | NaN | NaN | 45.0 | 57.8 | | 0.8 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | NaN | NaN | 90.0 | | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | NaN | NaN | 0.0 | | 0.9 | 30.6 | 45.0 | 43.5 | 30.5 | 27.4 | 45.0 | 0.0 | 0.0 | 23.2 | NaN | 0.0 | 0.0 | 22.4 | NaN | NaN | NaN | 33.7 | | 0.9 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | NaN | NaN | 45.0 | 45.0 | NaN | NaN | 45.0 | 45.0 | | 0.9 | 60.1 | 45.0 | 47.0 | 60.1 | 63.5 | 45.0 | 90.0 | 90.0 | 67.7 | NaN | 90.0 | 90.0 | 68.6 | NaN | NaN | NaN | 57.0 | | 0.9 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | NaN | NaN | 90.0 | | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | NaN | NaN | NaN | NaN | | 1.0 | 30.6 | 45.0 | 45.0 | 33.8 | 27.3 | 45.0 | 0.0 | 0.0 | 20.7 | NaN | 0.0 | 0.0 | 15.4 | NaN | NaN | NaN | 37.9 | | 1.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | 45.0 | NaN | NaN | 45.0 | 45.0 | NaN | NaN | 45.0 | 45.0 | | 1.0 | 60.1 | 45.0 | 45.1 | 56.8 | 63.6 | 45.0 | 90.0 | 90.0 | 70.4 | NaN | 90.0 | 90.0 | 75.8 | NaN | NaN | NaN | 53.0 | | 1.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | 90.0 | NaN | NaN | NaN | NaN |
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