Jammer Aided Communication and Autonomous Localization (JACAL)
Khiem Cai, Taehwan Kim, Jarrett Perry, James Landon, Raytheon Intelligence and Space
Alternate Number 3
JACAL is an alternative navigation technique developed by Raytheon for GPS denied environments that takes advantage of the high power transmissions from any three emitters (selectable, whether they are friendly, neutral or hostile) to obtain position. In this system, any User Equipment (UE) with 4 element antenna array can accurately measure the angle of arrival from such emitters, and with known emitters locations, UE can perform geolocation processing to locate itself, autonomously.
Simulation of the JACAL Position Navigation and Time (PNT) algorithm using a combination of eigen-signal processing, spectral and spatial processing demonstrated that the Differential Angle-of-Arrival (DAOA) could be measured to a small percentage of a degree. With this level of DAOA accuracy, the UE can calculate GPS accurate position while maintaining precise orientation.