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The system design of the Advanced Exterior Sensor (AES), test data and Sandia National Laboratories' current work on the AES is described. The AES integrates three sensor technologies (thermal infrared waveband, visible waveband, and microwave radar) in a Remote Sensor Module communicating with three motion detection target trackers and a sensor fusion software module in the Data Processor Module to achieve higher performance than single technology devices. Wide areas are covered by continuously scanning the three sensors 360 degrees in about one second. The images from the infrared and visible detector sets and the radar range data are updated as the sensors rotate each second. The radar provides range data with approximately one-meter resolution. Panoramic imagery is generated for immediate visual assessment of alarms using the Display Control Module. There is great potential for site security enhancement using the AES, which was designed for low-cost, easy use and rapid deployment to cover wide areas beyond typical perimeters, possibly in place of typical perimeter sensors, and for tactical applications around fixed or temporary high-value assets. Commercial-off-the-shelf (COTS) systems have neither the three sensor technologies nor the imaging sensor resolution. Cost and performance will be discussed for different scenarios.