Lockheed Martin is developing an innovative and adaptable optical telescope comprised of an array of nine identical afocal sub-telescopes. Inherent in the array design is the ability to perform high-resolution broadband imaging, Fizeau Fourier transform spectroscopy (FTS) imaging, and single exposure multi-spectral and polarimetric imaging. Additionally, the sensor suite's modular design integrates multiple science packages for active and passive sensing from 0.4 to 14 microns. We describe the opto-mechanical design of our concept, the Multiple Instrument Distributed Aperture Sensor (MIDAS), and a selection of passive and active remote sensing missions it fulfills.
After successful testing at the Raytheon facility in Danbury, Connecticut, the completed SAAO adaptive optical system has been shipped to the AEOS site on Haleakala, Maui, Hawaii. The system is undergoing final integration with the AEOS observatory. This paper describes the adaptive optics system design, including an overview of al major subsystems, the electronics, and the software. We discuss the design trades and system engineering that led to the final configuration. Also included is a review of opto-mechanical aspects of the system.
The optical design and the expected performances of a multi- band imaging system are presented. The instrument is to be operated in a low earth orbit in a pushbroom scanning mode. It has 15 spectral bands with the wavelength range extending from 0.45 micrometer to 10.7 micrometer. The instrument comprises a single mechanically cooled focal plane, a 36 cm aperture, wide field of view off-axis three mirror anastigmatic telescope, and an on-board calibration subsystem. The design has near diffraction limited performance for all spectral bands from visible to long wavelength infrared (IR). It has high throughput and low polarization sensitivity. To minimize the background noise at long wavelength infrared (LWIR) a cold stop is located at the exit pupil to achieve 100% cold shielding.
Hughes Danbury Optical Systems (HDOS) has developed several concepts for hyperspectral remote sensing of the earth and major and minor planets. The basic instrument is an imaging prism spectrometer located on an orbiting platform. The spectrometer slit is imaged by a telescope on the planetary surface and pushbroom scanned across it. The prism spectrometer disperses the observed slit image and reimages it in the multiple spectral bands onto a 2D focal plane array. Extensive use is made of Application Specific Integrated Circuits (ASICs) for signal processing in order to reduce power and weight. The baselined focal plane array is a 320 (image) X 210 (spectral) InSb detector. This detector provides high quantum efficiency for photons spanning the spectral range from the band gap limit of 5.4 micrometers to the ultraviolet. Various spectral ranges and spectral resolutions may be selected by appropriate choice of the prism and design of the spectrometer optics. These concepts for a spaceborne imaging prism spectrometer rely heavily on HDOS's HYDICE heritage. HYDICE (HYperspectral Digital Imaging Collection Experiment) is a prism imaging spectrometer being developed by HDOS for the Naval Research Laboratory. HYDICE will fly in a Convair aircraft and pushbroom scan the earth in 210 spectral colors between 0.4 micrometers and 2.5 micrometers . The heritage for the miniaturized electronics in the HDOS Miniature Star Tracker program.