Open-loop tracking of rising and setting GNSS radio-occultation signals from an Airborne Platform: Signal model and statistical analysis

Wang, K.-N; Muradyan, Paytsar; Garrison, James L.; Haase, Jennifer S.; Murphy, Brian J.; Acikoz, Ulvi; Lulich, T.

doi:10.1109/igarss.2013.6723550

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…[], rather than determining the Doppler shift from the signal itself. The method has been implemented in a software receiver and adapted to the signal dynamics of the airborne system [ Lulich et al ., ; Wang et al ., ]. We applied this open loop tracking to the raw 10 MHz RF data recorded by the GRS in postprocessing mode.…”

Section: Resultsmentioning

confidence: 99%

“…Open loop tracking was developed to replace the traditional feedback loop with a method that tracks the signal using an a priori estimate of Doppler shift, as described in Beyerle et al [2006], rather than determining the Doppler shift from the signal itself. The method has been implemented in a software receiver and adapted to the signal dynamics of the airborne system Wang et al, 2013]. We applied this open loop tracking to the raw 10 MHz RF data recorded by the GRS in postprocessing mode.…”

Section: 1002/2013gl058681mentioning

confidence: 99%

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First results from an airborne GPS radio occultation system for atmospheric profiling

Haase

Murphy

Muradyan

et al. 2014

Geophysical Research Letters

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Global Positioning System (GPS) radio occultation (RO) from low Earth-orbiting satellites has increased the quantity of high-vertical resolution atmospheric profiles, especially over oceans, and has significantly improved global weather forecasting. A new system, the Global Navigation Satellite Systems Instrument System for Multistatic and Occultation Sensing (GISMOS), has been developed for RO sounding from aircraft. GISMOS also provides high-vertical resolution profiles that are insensitive to clouds and precipitation, and in addition, provides greater control on the sampling location, useful for targeted regional studies. The feasibility of the system is demonstrated with a flight carried out during development of an Atlantic tropical storm. The data have been evaluated through a comparison with dropsonde data. The new airborne RO system will effectively increase by more than 50% the number of profiles available for studying the evolution of tropical storms during this campaign and could potentially be deployed on commercial aircraft in the future.

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Section: Resultsmentioning

confidence: 99%

Section: 1002/2013gl058681mentioning

confidence: 99%

First results from an airborne GPS radio occultation system for atmospheric profiling

Haase

Murphy

Muradyan

et al. 2014

Geophysical Research Letters

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“…We deployed two next‐generation dual‐frequency Multi‐GNSS phase locked loop tracking receivers to sample the cold sector and mid‐to‐upper levels in the AR. The receivers have an internal sampling rate of 100 Hz which is sufficient to track the phase accurately for relatively low expected atmospheric Doppler variations of ∼6 Hz (Wang et al., 2016, 2017) in the absence atmospheric multipath, which limits the ability to track into the lowest troposphere. The full GISMOS open‐loop tracking system is anticipated to be available for future deployments to facilitate sampling lower levels, but was not operating in this campaign.…”

Section: Ar Recon 2018 Measurement Campaignmentioning

confidence: 99%

“…Theoretical estimates of error sources have been modeled for airborne (Xie et al., 2008) and spaceborne systems (Kursinski et al., 1997). Statistical properties of ARO profiles have been studied for conventional (Murphy et al., 2015) and open‐loop tracking receiver systems (Wang et al., 2016, 2017) using dropsonde, radiosonde and model analyses for comparisons. Dropsonde and radiosonde comparisons in previous studies in tropical regions yielded typical standard deviation of 2% refractivity difference compared to ARO, from about 4 km to flight level.…”

Section: Aro Data Quality Assessmentmentioning

confidence: 99%

Multi‐GNSS Airborne Radio Occultation Observations as a Complement to Dropsondes in Atmospheric River Reconnaissance

et al. 2021

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GNSS radio occultation soundings from commercial off-the-shelf receivers on board balloon platforms

Nelson¹,

Xie²,

Chan³

et al. 2023

Atmos. Meas. Tech.

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Abstract. The Global Navigation Satellite System (GNSS) radio occultation (RO) technique has proven to be an effective tool for Earth atmosphere profiling. Traditional spaceborne RO satellite constellations are expensive with relatively low sampling density for specific regions of interest. In contrast, in-atmosphere RO platforms can provide much higher spatial and temporal sampling of ROs around regional weather events. This study explores the capability of a low-cost and scalable commercial off-the-shelf (COTS) GNSS receiver on board high-altitude balloons. The refractivity retrievals from balloon-borne RO payloads obtained from two flight campaigns (World View and ZPM-1) are presented. The balloon-borne RO soundings from the World View campaign show refractivity profiles between 6 and 19 km, with overall near-zero median difference from colocated ECMWF ERA5 reanalysis data and variability comparable to spaceborne RO missions (∼ 2.3 % median absolute deviation or MAD). Soundings from the ZPM-1 campaign show a relatively large positive refractivity bias (∼ 2.5 %). In summary, low-cost COTS RO payloads on board balloon platforms are worth further engineering and study in order to provide capabilities for dense, targeted atmospheric soundings that can improve regional weather forecasts via data assimilation.

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Open-loop tracking of rising and setting GNSS radio-occultation signals from an Airborne Platform: Signal model and statistical analysis

Cited by 3 publications

References 8 publications

First results from an airborne GPS radio occultation system for atmospheric profiling

First results from an airborne GPS radio occultation system for atmospheric profiling

Multi‐GNSS Airborne Radio Occultation Observations as a Complement to Dropsondes in Atmospheric River Reconnaissance

GNSS radio occultation soundings from commercial off-the-shelf receivers on board balloon platforms

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