Framework for a Software-defined Global Positioning System (GPS) Receiver for Precision Munitions Applications

Report No. ARL-TR-5976
Authors: Mark Ilg
Date/Pages: April 2012; 34 pages
Abstract: Gun-launched munitions rely heavily on the global positioning system (GPS) receivers for position, velocity, and up-finding in their guidance, navigation, and control (GN&C) systems. These receivers account for substantial cost in the GN&C electronics due to the contractor intellectual property and non-recurring engineering (NRE) costs. Typically, the designs are not optimized for gun-launched munitions, but rather as general purpose receivers for missiles, unmanned aerial vehicles, aircraft, man-portable location systems, and vehicles. Due to the high launch dynamics, short time of flight, high spin rate, etc., the general purpose receivers have trouble acquiring and locking on the weak GPS signals. To address these challenges, software algorithms tailored to the flight dynamics can assist in the basic features of the receiver as well as provide jamming and spoofing immunity. In this report, a software-defined radio (SDR) approach is used for the development of global navigation satellite systems (GNSS) receivers. This approach provides an evaluation capability for algorithm development and evaluation that is nearly hardware agnostic.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2012