A digital open-loop Doppler processing prototype for deep-space navigation

Jian, Nianchuan; Shang, Ke; Zhang, Sujun; Wang, Mingyuan; Shi, Xian; Ping, Jing; Yan, Jianguo; Tang, Geshi; Liu, JunZe; Qiu, Shi; Fung, Lai-Wo; Hua, Zhang; Wang, Zhen; Gou, Weiping

doi:10.1007/s11433-009-0283-y

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…Low signal-to-noise ratio (SNR) or large frequency dynamic range would lead to the phase loss-of-lock on the desired signal [6][7][8]. Specifically, some abrupt changes of frequency would cause the phase loss-of-lock in closedloop tracking measurement mode, for instance, in planetary atmospheric occultation and ring occultation [9,10] an open-loop Doppler measurement is preferable [11][12][13][14][15]. In this case, no real-time signal detection mechanism is typically present; the carrier signal or tone signal of the deep space probe is down converted, digitized, recorded, and analyzed to extract high accuracy open-loop Doppler observables.…”

Section: Introductionmentioning

confidence: 99%

“…Although PRIDE has been successfully and effectively utilized in several radio science experiments, the algorithm requires massive scale computing, due to PRIDE being designed to process the large wideband VLBI signal received by VLBI telescope. Currently, among the existing open-loop algorithms, some have the disadvantages of complicated algorithms and a huge amount of calculation [6,8], some require special hardware platforms for signal processing [19,20], and others utilize the PLL technique such as real-time PLL in closed-loop mode [10,12], in which the risk of loss-of-lock exists. The post-processing techniques of the open-loop Doppler may differ because different radio science or engineer teams develop their own software for signal processing and application.…”

Section: Introductionmentioning

confidence: 99%

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Retrieving Doppler Frequency via Local Correlation Method of Segmented Modeling

et al. 2021

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The high accuracy radio Doppler frequency is critical for navigating a deep space probe and for planetary radio science experiments. In this paper, we propose a novel method based on the local correlation of segmented modeling to retrieve Doppler frequency by processing an open-loop radio link signal from one single ground station. Simulations are implemented, which prove the validity of this method. Mars Express (MEX) and Tianwen-1 observation experiments were carried out by Chinese Deep Space Stations (CDSS). X-band Doppler frequency observables were retrieved by the proposed method to participate in orbit determination. The results show that the accuracy of velocity residuals of orbit determination in open-loop mode is from 0.043 mm/s to 0.061 mm/s in 1 s integration; the average accuracy of Doppler frequency is about 3.3 mHz in 1 s integration and about 0.73 mHz in 60 s integration. The Doppler accuracy here is better than that of the digital baseband receiver at CDSS. The algorithm is efficient and flexible when the deep space probe is in a high dynamic mode and in low signal to noise ratio (SNR). This will benefit Chinese deep space exploration missions and planetary radio science experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Retrieving Doppler Frequency via Local Correlation Method of Segmented Modeling

et al. 2021

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“…The Chinese lunar explorer Chang'E-1 also returned many splendid results [12][13][14][15][16][17][18][19] as did Chandrayaan-1 of India. A new era has arrived in both lunar science and in lunar exploration, that is, many countries can take part in these activities in addition to the USA and Europe.…”

Section: Resultsmentioning

confidence: 99%

Results obtained by geodetic instruments of SELENE (KAGUYA)

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Liu

Ping

et al. 2010

Sci. China Phys. Mech. Astron.

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Japanese lunar explorer SELENE (KAGUYA) was equipped with 14 instruments for various measurements of the Moon. Three of these instruments took geodetic measurements of the Moon. These were two sub-satellites and a laser altimeter. The main results obtained by the instruments are: (1) precise orbit determination with an accuracy of ten meters by Doppler and same-beam VLBI; (2) the first precise gravity fields on the lunar far side by 4-way Doppler measurements; (3) the first topography in latitudes higher than 86 degrees; (4) a global map of the gravity anomaly by using the global topography and the global gravity fields; (5) a global map of the lunar crustal thickness and (6) an illumination rate map in the north and south polar regions. SELENE, gravity field, lunar far side, topography, gravity anomaly, crustal thickness, illumination rate PACS: 96.12.Bc, 96.12.Qr, 95.10.Eg, 95.75.De SELENE was successfully launched in September 2007together with two sub-satellites. The SELENE mission has been proposed primarily to study the origin and evolution of the Moon by means of the global characterization of the lunar surface and investigations of its interior. A wide variety of observations by 14 instruments was carried out for about one year in order to perform these aims. These observations can be classified into five fields. Figure 1 shows relations among the observations by SELENE, scientific knowledge of the Moon to be obtained from the observations and our aims (lunar origin and evolution) [1]. The geodetic instruments among the 14 ones are two sub-satellites and a laser altimeter. Geodetic observations by them played the roles that are shown in the hatched blocks in Figure 1. Strategy in geodetic observations of SELENEThere are not so many methods to study the interior of a planet or the Moon. For example, observations of lunar rotation and moonquakes have revealed the Moon's internal structure. Lunar gravity fields enabled us to better under- Figure 1 Observations by SELENE and scientific knowledge to be obtained. The hatched blocks are items with relation to geodetic measurements.

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“…This mechanism allows an observer to directly reconstruct the sky frequency of parts of the detected signal that would be otherwise considered lost. For the post-processing of the open-loop Doppler, although it relies on the same main detection methods (PLL and FFT), there are various spectral analyses approaches that can be used (Lipa & Tyler 1979;Tortora et al 2002;Paik & Asmar 2011;Jian et al 2009). …”

Section: Introductionmentioning

confidence: 99%