%0 Journal Article %1 Ledvina2005a %A Ledvina, B. M. %A Psiaki, M. L. %A Powell, S. P. %A Kintner, P. M. %D 2005 %J Proc. of the 18th ION GNSS Conf. %K GPS, satnav softwareReceiver, tracking %P 1598-1610 %T Real-Time Software Receiver Tracking of GPS L2 Civilian Signals using a Hardware Simulator %X A dual-frequency civilian L1/L2 GPS receiver has been tested that runs 12 tracking channels in real time using a software correlator. This work is part of an effort to develop flexible receivers that can use the new GPS L2 CM/CL signals as they become available on L2 without the need for new correlator hardware. The receiver consists of an RF front end, a system of shift registers, a digital data acquisition (DAQ) system, and software that runs on a 3.4 GHz PC. An analog mixing RF front end composed of separate L1 and L2 signal channels converts the L1 C/A code and L2 CM/CL code signals into two 2-bit digital data streams sampled at 5.714 MHz. The shift registers parallelize the two 2-bit data streams, which the DAQ reads into the PC's memory using direct memory access. The PC performs baseband mixing and PRN code correlations in a manner that directly simulates a hardware digital correlator. It also performs the usual signal tracking and navigation functions, under the control of a real-time Linux operating system. The main contributions of this work are a design for an inexpensive dual-frequency GPS civilian L1/L2 RF front end and demonstration of GPS civilian L1/L2 software receiver running on a GPS signal simulator. This RF front end uses two commercially-available GPS RF front ends designed for the L1 C/A code signal. To accommodate the L2 CM/CL code signal, a synthesizer and mixer are located upstream of the RF front end and are used to up-convert the L2 signal to the L1 frequency minus roughly 6 kHz. The successful operation of the receiver while connected to a hardware simulator indicates that the receiver should function when the first civilian L2 signals become available.The GPS civilian L1/L2 software receiver tracks 12 channels in real time and has a navigation accuracy of 1-3 meters. It requires 81% of the processing capabilities of a 3.4 GHz Intel Pentium 4 PC.

@article{Ledvina2005a, abstract = {A dual-frequency civilian L1/L2 GPS receiver has been tested that runs 12 tracking channels in real time using a software correlator. This work is part of an effort to develop flexible receivers that can use the new GPS L2 CM/CL signals as they become available on L2 without the need for new correlator hardware. The receiver consists of an RF front end, a system of shift registers, a digital data acquisition (DAQ) system, and software that runs on a 3.4 GHz PC. An analog mixing RF front end composed of separate L1 and L2 signal channels converts the L1 C/A code and L2 CM/CL code signals into two 2-bit digital data streams sampled at 5.714 MHz. The shift registers parallelize the two 2-bit data streams, which the DAQ reads into the PC's memory using direct memory access. The PC performs baseband mixing and PRN code correlations in a manner that directly simulates a hardware digital correlator. It also performs the usual signal tracking and navigation functions, under the control of a real-time Linux operating system. The main contributions of this work are a design for an inexpensive dual-frequency GPS civilian L1/L2 RF front end and demonstration of GPS civilian L1/L2 software receiver running on a GPS signal simulator. This RF front end uses two commercially-available GPS RF front ends designed for the L1 C/A code signal. To accommodate the L2 CM/CL code signal, a synthesizer and mixer are located upstream of the RF front end and are used to up-convert the L2 signal to the L1 frequency minus roughly 6 kHz. The successful operation of the receiver while connected to a hardware simulator indicates that the receiver should function when the first civilian L2 signals become available.The GPS civilian L1/L2 software receiver tracks 12 channels in real time and has a navigation accuracy of 1-3 meters. It requires 81% of the processing capabilities of a 3.4 GHz Intel Pentium 4 PC.}, added-at = {2011-05-30T10:41:10.000+0200}, author = {Ledvina, B. M. and Psiaki, M. L. and Powell, S. P. and Kintner, P. M.}, biburl = {https://www.bibsonomy.org/bibtex/21204ae55a647b4632a1bf63429818f44/bmuth}, groups = {private}, interhash = {f16f329816c378eda21d01b0ee4b8192}, intrahash = {1204ae55a647b4632a1bf63429818f44}, journal = {Proc. of the 18th ION GNSS Conf.}, keywords = {GPS, satnav softwareReceiver, tracking}, owner = {bmuth}, pages = {1598-1610}, timestamp = {2014-08-11T22:37:44.000+0200}, title = {{Real-Time Software Receiver Tracking of GPS L2 Civilian Signals using a Hardware Simulator}}, username = {bmuth}, year = 2005 }