CSSR: a 2FOR1 Compressive Sensing Software Receiver with combined correlation for GPS-CA and Galileo-OS signals

摘要

This is a 2for1 receiver because it acquires both GPS and Galileo signals at less than 50% of the complexity and processing time required by a Matched Filter acquisition receiver. CSSR is a new implementation of a dual-GNSSsignal Software Receiver using, for the first time, the Compressive Sensing technique to process the two signals at the same time (in this implementation, GPS C/A code and Galileo OS code signals are used). This paper indorses that Compressive Sensing can be effectively used to acquire GNSS signals with its information-band sampled at below the Nyquist rate. This paper describes this implementation, focusing on: (a) how we remove the subcarrier frequency effect from the Galileo signal, and combine it with the GPS signal; (b) how we pre-process this combined signal to generate the non-Doppler shift vectors that compensates for the matching measurements in the acquisition; and finally (c) how we acquire both signals simultaneously by combining their dictionaries/correlators. CSSR has been simulated using various actual signal conditions/scenarios. The results are compared to those obtained from running the same tests on 3-other matched filter receivers. CSSR achieves similar probability of detection to the others, and has a higher frequency resolution of 10Hz for the same 4ms dwell time. With Application processors on-board Smartphones getting more powerful and cheaper, and with 60% of the 3.1 billion dual GNSS offering on-board current Smartphones are based on side-by-side implementations, we believe that CSSR is a good candidate to saving cost and valuable battery energy when implemented on-board Smartphones.