Modeling the MTI electro-optic system sensitivity and resolution

In this work, a fast calculation method of the scattered radiance for scenario involving both the earth surface and the earth-limb regions is proposed. The single scattering equation of typical two-stream approximate is adapted to compute atmospheric radiative transfer under the spherical-parallel atmosphere assumption. With specified atmospheric profiles, spectral band and observation geometry, a two-dimensional (2-D) matrix of the scattered radiance varying with incident zenith and viewing zenith angles are then calculated. Finally, the earth disk images are generated for different spectral bands by interpolating the calculated radiance matrices. Simulation results of multispectral earth disk images for space-based earth observation sensors are presented to demonstrate the usefulness of the proposed technique for high fidelity scene generation where both the earth surface and the earth-limb regions are observed.

“…The sensor noise model follows the analysis methodology in reference [2], while the detection performance model follows reference [15]. We will not discuss in detail here.…”

Section: Signal Model For Ir Sensormentioning

confidence: 99%

Fast calculation of scattered radiance in multispectral imagery simulation

2015

“…Moreover, in the background radiation model, a random number is introduced to describe the influence of the surface roughness on the background radiation. The sensor noise model follows the analysis methodology in reference [7], while the detection performance model follows reference [8]. We will not discuss in detail here.…”

Section: Signal Model For Ir Sensormentioning

confidence: 99%

“…To evaluate the detection performance of a designed sensor, apparent contrast and signal to noise ratio (SNR) are most commonly parameters used 6,7 . In general, for a specified target, the detection performance of the designed sensor is determined by its spectral band.…”

Section: Introductionmentioning

confidence: 99%

Contrast analysis of space-based Earth observation infrared system

2014

In this work, we focus on developing the infrared (IR) sensor and performance analysis model for space-based IR systems which are designed for detection of space targets in the earth and the earth-limb background. Corresponding to the sensor observation geometry, a simplified transmittance calculation scheme applicable to large-scale scenes as well as a mathematical model for pixel-by-pixel irradiance calculation is proposed. By defining the apparent contrast of targets in simulated IR images, a model for detection performance analysis is developed for sensors operating in different spectral bands. Typical simulation examples are presented to validate the current model and methodology.

“…[5]. As illustrated in Fig.1, the NEFD op produced by optical system radiation consists of three main parts [1,5]: NEFD op,oc produced by optical components radiation, NEFD op,fs produced by field-stop radiation, and NEFD op,cs produced by coldshield radiation.…”

Section: Nefd Of Optical System Near-field Radiationmentioning

confidence: 99%

“…In this paper, by utilizing the corresponding parameters of the Multispectral Thermal Imager (MTI) [1] electro-optic sensor system, the impact of the optical cryogenic temperature on the performance of IR sensors in sensitivity and aperture size are studied for a point-source detection space-borne staring IR sensor system. The remainder of the paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Prediction of cryogenic temperature impact on the performance of space-borne IR sensors

Shi

2007

The sensitivity of a sensor system and its optical aperture size are two key parameters commonly used to characterize the performance of a remote sensing or space-borne surveillance system. In this work, a sensitivity model for space-borne staring IR sensor systems which are mainly used for point-source detection and identification is developed. Different noise components, including the photon noise from background radiation and near-field thermal radiation of optics, the electronic noise of sensors, as well as the nonuniformity noise of an infrared focal plane array (FPA), are considered. Based on the published parameters of the Multispectral Thermal Imager (MTI) electro-optic sensor system, the feasibility and validity of the model are demonstrated, with emphasis on the prediction of the cryogenic temperature impact on the sensor sensitivity and the optical aperture size requirement in a space-borne multispectral infrared (IR) system.