Global Positioning System (GPS) Simulator Phase Calibration

"The need exists for a system capable of interfacing with the RF outputs of existing GPS simulators and measuring the phase delay for both L1 and L2 GPS frequencies across all the simulator channels. This must be accomplished at an operational power levelof approximately -163dBw.Under this SBIR effort, we propose to leverage our expertise with multi-element phase array GPS receivers and GPS simulator technology to deliver a low cost, Simulator Calibration (SIMCAL) PC-Based Test Set. This will provide the ability to make precise,unambiguous phase observations between multiple RF elements (L1 and L2) by recording and processing the GPS RF signals on each channel to calibrate for group-delay and phase offsets between the different channels.Under the Phase I effort we will develop a design for the simulator calibration process and assemble a prototype SIMCAL PC Test Set using in-house equipment. This will be used to collect a test data set to develop the SIMCAL calibration algorithms and todemonstrate the calibration performance. Under the Phase II effort, we propose to build and deliver a SIMCAL PC Test Set to the customer for maintenance of precise group-delay and carrier phase offset calibration data on their on-site GPS simulators. New DoD and Civil programs such as the Joint Precision Approach Landing System (JPALS), Wide Area Augmentation System (WAAS), Local Area Augmentation System (LAAS) and Navigation Warfare (Navwar) requir