Managing projector aliasing for tactical infrared imaging systems

Ronald Driggers, Mark Manzardo, Ellis E. Burroughs, Carl Halford, Richard Vollmerhausen

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


Resistor arrays are the leading technology for testing tactical imaging infrared sensors with a real-time Dynamic Infrared Scene Projector (DIRSP) system. The fundamental goal of a DIRSP system is to project "in-band" infrared imagery to a level of detail such that a Unit Under Test (UUT) perceives and responds to the synthesized scenes just as it would to the real world scenes. In the real world, these tactical scenes are continuous functions that contain both low and high spatial frequencies. Unfortunately, resistor arrays have a discrete number of elements requiring a sampled version of the scenario. The output of the DIRSP is a stepwise continuous radiance distribution that is projected through the DIRSP optics, the UUT optics, and onto the UUT detector array. In many sensors, the UUT detector array produces a sampled version of the irradiance. This continuous to digital to continuous to digital system requires careful analysis regarding the aliasing that may result. Results of such an analysis are presented here. Specifically, the aliasing issues are addressed with results obtained for the typical case of a slightly undersampled sensor (regarded in testing as "natural" aliasing.) The analysis indicates the scene projector's spatial frequency limit (i.e., its folding frequency) should exceed the average of the UUT sensor's cutoff spatial frequency and the spatial frequency cutoff of the scene pre-filter (or scene band limit if pre-filtering is not used). This constraint does not eliminate aliasing. Rather it provides for the natural aliasing present in the sensor while avoiding spurious effects from unnatural aliasing in the creation and projection of the synthetic tactical scenes. The scene projector requirement developed in this work is applicable for tactical imagers and imaging missile seekers.

Original languageEnglish (US)
Pages (from-to)317-327
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1997 Technologies for Synthetic Environments: Hardware-in-the-Loop Testing II - Orlando, FL, United States
Duration: Apr 21 1997Apr 23 1997


  • Aliasing
  • Infrared
  • Scene Projection
  • Testing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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