Rapid Acquisition of P(Y) Code Signals Using Electro-Optic Signal Processing

Period of Performance: 03/11/1998 - 06/11/2000


Phase 2 SBIR

Recipient Firm

Navsys Corp.
14960 Woodcarver Road Array
Colorado Springs, CO 80921
Principal Investigator

Research Topics


Modern GPS receivers adopt a digital architecture to facilitate signal processing using high speed VHDL electronics. NAVSYS has developed a buffered digital receiver architecture (the TIDGET [TM]-Plus) that optimized the GPS search and acquisition process by operationg in the frequency domain. The Rapid Acquisition FFT (RAFFT) approach was developed by NAVSYS initially to speed high dynamic C/A code Acquisition. This technique has since been extended, to be applied for direct P(Y) code acquisition.The effectiveness of the NAVSYS RAFFT algortihm is dictated by the speed of the FFT implementation. High speed DSPs can perform a 1024 point FFT sin less than 128 usecs. The performance of the RAFFT approach can be dramatically improved by using an electro-optic correlator. Digital Spatial Light Modulators (SLM) are under development that can perform 1000 x1000 2-dimensional correlations at kHz rates, which is equivalent to over 10(6) parallel correlators.Under this SBIR effort an EO-RAFFT design and demonstration system will be developed and tested to demonstrate the massive parallelism possible using modern electro-optic correlator will be developed using Smart Pixel Array (SPA) technology to demonstrate direct P(Y) code acquisition with a GPS receiver.