Universal Software Assured Position, Navigation and Timing (USAPNT) Receiver

We propose to develop a universal software assured position, navigation and timing (USAPNT) receiver, implement the design on an existing testbed, and field-test the system in Phase I. The existing testbed has two units, each containing 7 synchronous and coherent radio channels (a combination of 14) that can be software-programmed on the fly to acquire and track all GNSS signals and signals of opportunity (SOOP) of interest to this program. Each signal can be I/Q-sampled continuously at 25 MHz in 14 bits or 50 MHz in 8 bits (maximum 100 MHz complex samples non-sustainable) and then saved for post-processing. Software receivers have been developed for GPS, DTV (ATSC-8VSB), GSM, CDMA in cellular and PCS bands and will be extended to further include GLONASS, Galileo, Beidou and LTE and other signals in Phase I. Innovations of the proposed receiver designs include high sensitivity for protection against jamming and spoofing detection and mitigation for GNSS signals and an agile architecture with optimized tracking loops against urban mobile fading for SOOP. Furthermore, a technologically mature channelized RF front-end is considered for optimal spectrum control and signal-adaptive power management for highly miniaturized and tightly integrated systems. More importantly, the synergy between GNSS signal processing and SOOP fusion will be exploited for mutual aiding so as to improve PNT assurance level. Computationally efficient implementations on FPGA will be studied with our transitioning partner toward a preliminary design of the prototyping approach for Phase II.