| 摘要 |
In an IRST system, a determination of the range and type of a detected target may be made as follows. Atmospheric transmittance and background spectral radiance is estimated from available meteorological data and then, at each of consecutive scans, the contrast irradiance in the direction of a target is measured as well as the azimuth and elevation of said target. A target type is selected from a library of target types storing signatures of the target types considering the measured contrast irradiance as well as the measure of the contrast irradiance at the previous scan (if any). The range of the target is calculated considering the selected target type, the estimated atmospheric parameters and the measured contrast irradiance. Where the target has other than a radially inbound trajectory the trajectory of the target is estimated and the target type selected from the library, considering the estimated trajectory. The range of the target is estimated considering the selected target type, the angular movement of the target, and the range estimate for the target made during the last scan. Given two range estimates, the estimates are combined.
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