We introduce and analyze the first data from an array of closely spaced Global Positioning System (GPS) scintillation receivers established in the auroral zone in late 2013 to measure spatial and temporal variations in L-band signals at... more
We introduce and analyze the first data from an array of closely spaced Global Positioning System (GPS) scintillation receivers established in the auroral zone in late 2013 to measure spatial and temporal variations in L-band signals at 100-1000 meters and sub-second scales. The seven receivers of the Scintillation Auroral GPS Array (SAGA) are sited at Poker Flat Research Range (PFRR), Alaska. The receivers produce 100-s scintillation indices and 100 Hz carrier phase and raw in-phase and quadrature-phase samples. SAGA is the largest existing array with baseline lengths of the ionospheric diffractive Fresnel scale at L-band. With an initial array of five receivers, we identify a period of simultaneous amplitude and phase scintillation. We compare SAGA power and phase data with collocated 630.0 nm all-sky images of an auroral arc and incoherent scatter radar electron precipitation measurements, to illustrate how SAGA can be used in multi-instrument observations for sub-kilometer scale studies.
This paper deals with the hardware implementation of base band (acquisition and tracking) modules of a GPS receiver using system generator 9.2 has been tried out. The implementation will be tested on Lyrtech (small form factor-software... more
This paper deals with the hardware implementation of base band (acquisition and tracking) modules of a GPS receiver using system generator 9.2 has been tried out. The implementation will be tested on Lyrtech (small form factor-software defined radio) platform which consists of 3 layers. The upper layer is the radio frequency (1 GHz) layer, middle layer is the ADACMasterIII layer and the last is digital processing (DSP) layer. The data transfer between the FPGA Virtex-4SX35 and DSP module is done using a TMS320DM6446 Davinci processor. Generation of 17MHz Intermediate frequency has been done. The acquisition module based on parallel code phase search acquisition algorithm has been tried out. The results are being tested for correctness and accuracy. After this the tracking module will be implemented. The results will lead to the development of indigenous GPS receivers with single and multiple channels within the same hardware with reconfiguration
В статті проаналізовано GNSS–спостереження отримані в рамках проведення першої GNSS-кампанії у Північному регіоні. Розглянуто вплив DOP фактора та ефекту багатошляховості на результати. Analysis of GNSS-observations in the Northern... more
В статті проаналізовано GNSS–спостереження отримані в рамках проведення першої GNSS-кампанії у Північному регіоні. Розглянуто вплив DOP фактора та ефекту багатошляховості на результати.
Analysis of GNSS-observations in the Northern region of Ukraine
The article analyzes the GNSS-observations obtained in the framework of first GNSS-campaign in the North region. The effect of DOP factor and multipath effect on the results.
