Real-time scene generation infrared radiometry

Real-time scene and signature generation for ladar and imaging sensors

“…In general, the process of calculating radiometry for real-time ladar scene generation is similar to infrared scene generation and readers are referred to our previous publication. 2 Passive background radiation collected by the sensor carries no information about the range to the target and is distractive for the formation of the range image. In order to reduce the amount of background radiation an optical bandpass filter is usually present in ladar systems.…”

“…The angular dependence of both the reflectance and emissivity can be calculated from the Fresnel equations and tabulated or fitted to a simple functional form in order to aid real-time calculations. 2 In the past, some researchers have used a statistical approach or have implemented texture maps on the sea surface to represent emission and reflection from waves, especially at the capillary level. In contrast, VIRSuite embodies a high fidelity real-time dynamic simulation of the ocean surface from close-range to the horizon, covering wavelengths from several millimetres up to a few kilometres (as described in Section 2.2.1).…”

“…The maritime motion model is comprised of three principal elements: (1) the time propagation of ocean waves; (2) boat and ship dynamics, and (3) simulation of local water disturbances such as boat wakes and spray. Real-time ocean surface simulation is supported by VIROcean.…”

“…[1][2][3][4][5][6] It is designed to provide closed-loop dynamic simulations of complex scenarios that include moving objects, composite backgrounds, sources of radiation and precise radiometry. The main simulation scenarios may be classified into the following three groups: (1) air scenario with aircrafts and backgrounds, (2) maritime scenario with boats, ships and ocean waves, and (3) land scenario with land objects in composite terrain environments.…”

“…VIRSuite is a real-time scene generator, designed to provide closed-loop dynamic simulation of complex scenarios that may be classified into the following three groups: (1) air scenario with aircraft and backgrounds, (2) maritime scenario with boats, ships and ocean waves, (3) land scenario with land objects in composite terrain environments. [1][2][3][4][5][6] Initially, VIRSuite was developed for generating imagery for aircraft scenarios in the MWIR band only. It was later extended to generate MWIR, LWIR, visual scenery and range imagery for LADAR scene generation.…”