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7 January 1999 DARPA unattended ground sensor systems: analysis of communication systems for internetting UGS systems
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Proceedings Volume 3577, Sensors, C3I, Information, and Training Technologies for Law Enforcement; (1999) https://doi.org/10.1117/12.336961
Event: Enabling Technologies for Law Enforcement and Security, 1998, Boston, MA, United States
Abstract
During May 1997 - October 1998, SPAWARSYSCEN Code D746, under the sponsorship of the Defense Advanced Research Projects Agency (DARPA), conducted several field tests using off-the-shelf (OTS) 900 MHz wireless modems in different operating environments, typical of those targeted by unattended ground sensor (UGS) applications. Using ground-based 12 inch (mounted on 3 inch base) 3dB onmidirectional antennas on both communication ends, the performance of three OTS modems was evaluated. By varying path lengths, baud rates, file sizes, RF environments, and degrees of line of sight (LOS), a comprehensive profile of each modem's performance was established. Because of the nature of ground-level communications (varied LOS) and the many environmental variables which can dramatically affect performance, this paper does not attempt to model performance or draw conclusions as to which modem is best suited for all UGS applications. However, based on the results of these field tests, the OTS modem using frequency hopping spread spectrum (FHSS) performed considerably better than the two other OTS modems using direct sequence spread spectrum. This certainly could be attributed to the poor quality of the two DSSS modems used in the field tests, and a more comprehensive side-by-side comparison is recommended. In addition, the paper does offer insight into the limitations of the OTS wireless modems, and demonstrates how greater degrees of LOS can tremendously boost their range and reliability.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Todd M. Hintz, Edward M. Carapezza, David B. Law, and Gerald D. Edwards "DARPA unattended ground sensor systems: analysis of communication systems for internetting UGS systems", Proc. SPIE 3577, Sensors, C3I, Information, and Training Technologies for Law Enforcement, (7 January 1999); https://doi.org/10.1117/12.336961
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