Fringe fitting and group delay determination for geodetic VLBI observations of DOR tones

Han, Songtao; Nothnagel, A.; Zhang, Zhongkai; Haas, Rüdiger; Zhang, Qiang

doi:10.1016/j.asr.2018.11.018

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Taking session rd1601 (OCEL09) as an example, Figure 5 shows the quasar used for calibration and sky plot of station Onsala for the schedule file. [44], and a refreshed version "fourfit-DOR" is developed which extends the fringe fitting algorithm of "fourfit" to allow for processing of DiFX correlation output of DOR tones [45]. △DOR theorem and application are widely discussed [15,46]; in OCEL, geodetic observations with different systematic frequency altered each half an hour, and the change in channel parameter caused delay offsets.…”

Section: Ocel Projectmentioning

confidence: 99%

Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight

Han

Zhang

Sun

et al. 2019

Advances in Astronomy

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China Chang’E-3 performed soft landing at the plains of Sinus Iridum on lunar surface on December 14th 2013 successfully; it opened a new window for observing lunar surface with radiometric tracking which many lunar scientific researchers always pursue for. Since July 2014, OCEL (Observing Chang’E-3 Lander with VLBI) project has been conducted jointly by IVS (International VLBI Service of Geodesy and Astrometry) and BACC (Beijing Aerospace Control Center), a global IVS R&D network augmented with two China Deep Space Stations configured for OCEL. This paper presents the current status and preliminary result of the OCEL and mainly focuses on determination of the lander position, which is about 7 meter in height and 14 meter in plane of lunar surface with respect to LRO (Lunar Reconnaissance Orbiter). Based on accuracy analysis, further optimized OCEL sessions will make use of this target-of-opportunity, the Chang’E-3 lunar lander, as long as it is working. With higher accurate radiometric observables, more prospective contribution to earth and lunar science is expected by combining with LLR.

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Section: Ocel Projectmentioning

confidence: 99%

Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight

Han

Zhang

Sun

et al. 2019

Advances in Astronomy

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“…Klopotek et al (2019) adopted the DiFX to estimate the position of the Chang'E-3 lunar lander by analyzing the geodetic VLBI observations of DOR tones. Han et al (2019) introduced the 4 https://voyager.jpl.nasa.gov/mission/status. fourfit-DOR algorithm to improve fringe fitting of DOR tones.…”

Section: Introductionmentioning

confidence: 99%

Local correlation of delta-DOR signals with low signal-to-noise ratio and severe radio frequency interference

Ma¹,

Li²,

Tong³

et al. 2021

Meas. Sci. Technol.

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The Chinese very long baseline interferometry net (CVN) has applied the delta differential one-way ranging (delta-DOR) radiometric tracking technique to determine the orbit of a lunar and a deep-space spacecraft. In the past observations, CVN had sometimes encountered a difficult observation situation that the DOR signals were extremely weak or severely interfered. The CVN FX correlator, usually cannot process these extremely weak DOR signals. In order to enhance the weak signal processing capability of CVN, here we report an alternative method called 'local correlation'. By this method, the distinct DOR signals structure features of the narrow bandwidth sinusoidal tone and their coherent phase, are used to extract the exact frequency and phase of each tone. We have adopted the method on the weak signal case, then compared with the results obtained from CVN FX correlator. Analysis result shows the local correlation method can process DOR tone at lower signal-to-noise ratios such as 1 dBHz. The method also has advantages of high anti-interference, low computation cost and high efficiency. Furthermore, the delta-DOR delay obtained from local correlation can improve the orbit accuracy and reduce the arc length required by the orbit determination after the trajectory course maneuver.

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The correlation process in Very Long Baseline Interferometry

Nothnagel

2019

Int J Geomath

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Fringe fitting and group delay determination for geodetic VLBI observations of DOR tones

Cited by 7 publications

References 12 publications

Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight

Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight

Local correlation of delta-DOR signals with low signal-to-noise ratio and severe radio frequency interference

The correlation process in Very Long Baseline Interferometry

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