A Detailed Analysis of GPS Live-Sky Signals Without a Dish

York, Johnathan; Joplin, Andrew J.; Bratton, Michael; Munton, David

doi:10.1002/navi.69

Cited by 4 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We are leveraging the High Rate Tracking Receiver (HRTR) to serve as both an advanced software-defined GNSS receiving system and a general purpose L-band receiver (York et al 2012(York et al , 2014. It directly digitizes voltage from the receiver in a range of 1 to 2 GHz at a rate of 2 gigasamples per second.…”

Section: A Microwave Technique For Vlbi/gnss Tie Measurementsmentioning

confidence: 99%

A Concept of Precise VLBI/GNSS Ties with Micro-VLBI

Petrov,

York,

Skeens

et al. 2023

International Association of Geodesy Symposia

Self Cite

View full text Add to dashboard Cite

We present here a concept of measuring local ties between collocated GNSS and VLBI stations using the microwave technique that effectively transforms a GNSS receiver to an element of a VLBI network. This is achieved by modifying the signal chain that allows to transfer voltage of the GNSS antenna to a digitizer via a coaxial cable. We discuss the application of this technique to local tie measurement. We have performed observations with a GNSS antenna and FD-VLBA radiotelescope and detected a strong interferometric signal from both radiogalaxies and GNSS satellites.

show abstract

Section: A Microwave Technique For Vlbi/gnss Tie Measurementsmentioning

confidence: 99%

A Concept of Precise VLBI/GNSS Ties with Micro-VLBI

Petrov,

York,

Skeens

et al. 2023

International Association of Geodesy Symposia

Self Cite

View full text Add to dashboard Cite

show abstract

“…(2011), York et al. (2012, 2014). The HRTR is a software‐defined GNSS receiving system that provides direct sampling of the L‐band at approximately 2 Gigasamples per Second (GSPS), followed by real‐time direct digital down conversion inside of a Field Programmable Gate Array (FPGA).…”

Section: The Gnss‐radio Telescope Interferometermentioning

confidence: 99%

First Observations With a GNSS Antenna to Radio Telescope Interferometer

Skeens,

York,

Petrov

et al. 2023

Radio Science

View full text Add to dashboard Cite

We describe the design of a radio interferometer composed of a GNSS antenna and a VLBI radio telescope. Our eventual goal is to use this interferometer for geodetic applications including local tie measurements. The GNSS element of the interferometer uses a unique software‐defined receiving system and modified commercial geodetic‐quality GNSS antenna. We ran three observing sessions in 2022 between a 25 m radio telescope in Fort Davis, Texas (FD‐VLBA), a transportable GNSS antenna placed within 100 meters, and a GNSS antenna placed at a distance of about 9 km. We have detected a strong interferometric response with a Signal‐to‐Noise Ratio (SNR) of over 1000 from GPS and Galileo satellites. We also observed natural radio sources including Galactic supernova remnants and Active Galactic Nuclei (AGN) located as far as one gigaparsec, thus extending the range of sources that can be referenced to a GNSS antenna by 18 orders of magnitude. These detections represent the first observations made with a GNSS antenna to radio telescope interferometer. We have developed a novel technique based on a Precise Point Positioning (PPP) solution of the recorded GNSS signal that allows us to extend integration time at 1.5 GHz to at least 20 minutes without any noticeable SNR degradation when a rubidium frequency standard is used.

show abstract

“…The most popular use of BSP is to track encrypted signals by exploiting similarities in the navigation signal structures in order to estimate signal parameters that are relevant for positioning, such as the delay, Doppler, or carrier phase (Betz & Cerruti, 2020;O'Driscoll & Curran, 2016;Woo, 1999). Other applications include signal analysis by timely deconvolution of spreading code sequences to raise the signal above the noise floor (York et al, 2014). A very direct method of blind processing is the use of a high-gain dish antenna, which directly raises the signal above the noise floor and thus reveals the signal structure.…”

mentioning

confidence: 99%