Accurate and Rapid Broadcast Ephemerides for Beidou-Maneuvered Satellites

Qiao, Junfei; Chen, Wu; Ji, Shengyue; Weng, Duojie

doi:10.3390/rs11070787

Cited by 7 publications

(4 citation statements)

References 31 publications

(43 reference statements)

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“…In general, the actual maneuver period was about 30 min (Qiao et al, 2019), but the abnormal of broadcast ephemeris may last several hours. The total time span when the satellite has abnormal ephemeris is called the orbital maneuver period in this study.…”

Section: Estimation Of the Corrections Of Orbit Errors For The Maneuver Satellitementioning

confidence: 99%

Recover the abnormal positioning, velocity and timing services caused by BDS satellite orbital maneuvers

Zhang

et al. 2021

Satell Navig

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The BeiDou Navigation Satellite System (BDS) provides global Positioning, Velocity, And Timing (PVT) services that are widely used in various areas. The BDS satellites frequently need the orbit maneuvers due to various perturbations to keep satellites in their designed positions. During these maneuvers, PVT services may be abnormal if the data from a maneuvering satellite is used. In this paper we developed an approach to recover the abnormal PVT services. By using BDS observations from multiple tracking stations, the orbital errors of a maneuvering satellite can be in real time obtained and corrected, thereby avoiding any influence on the performance of PVT services. The tests show that the average precision of position, velocity and timing services are improved by 0.8 m, 0.1 mm/s and 0.16 ns, respectively, using the developed orbital maneuver recovery approach. In addition, the approach can also be used for the orbital maneuver detection and monitoring.

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Section: Estimation Of the Corrections Of Orbit Errors For The Maneuver Satellitementioning

confidence: 99%

Recover the abnormal positioning, velocity and timing services caused by BDS satellite orbital maneuvers

Zhang

et al. 2021

Satell Navig

View full text Add to dashboard Cite

show abstract

“…In a GNSS, GNSS navigation satellites need to be widely distributed and used as radiation sources. Among existing GNSSs [4][5][6][7], Global Positioning System (GPS) has been broadly recognized and acknowledged as an advanced and mature technology in target detection due to its wider coverage and shorter observation time compared to other GNSSs, such as the Beidou satellite system [8] and Golbal navigation satellite system (GLONASS). Generally, target detection is conducted using a single GPS as the radiation source [9].…”

Section: Introductionmentioning

confidence: 99%

Passive Detection of Moving Aerial Target Based on Multiple Collaborative GPS Satellites

et al. 2020

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Passive localization is an important part of intelligent surveillance in security and emergency applications. Nowadays, Global Navigation Satellite Systems (GNSSs) have been widely deployed. As a result, the satellite signal receiver may receive multiple GPS signals simultaneously, incurring echo signal detection failure. Therefore, in this paper, a passive method leveraging signals from multiple GPS satellites is proposed for moving aerial target detection. In passive detection, the first challenge is the interference caused by multiple GPS signals transmitted upon the same spectrum resources. To address this issue, successive interference cancellation (SIC) is utilized to separate and reconstruct multiple GPS signals on the reference channel. Moreover, on the monitoring channel, direct wave and multi-path interference are eliminated by extensive cancellation algorithm (ECA). After interference from multiple GPS signals is suppressed, the cycle cross ambiguity function (CCAF) of the signal on the monitoring channel is calculated and coordinate transformation method is adopted to map multiple groups of different time delay-Doppler spectrum into the distance–velocity spectrum. The detection statistics are calculated by the superposition of multiple groups of distance-velocity spectrum. Finally, the echo signal is detected based on a properly defined adaptive detection threshold. Simulation results demonstrate the effectiveness of our proposed method. They show that the detection probability of our proposed method can reach 99%, when the echo signal signal-to-noise ratio (SNR) is only −64 dB. Moreover, our proposed method can achieve 5 dB improvement over the detection method using a single GPS satellite.

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“…Passive target detection using satellite illumination is an important application in satellite systems, which utilizes signals to detect moving targets through signal processing technologies [4,5]. Most existing works on passive target detection makes a strong assumption of a single satellite, in which only signals for a single satellite need to be processed [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Using Heterogeneous Satellites for Passive Detection of Moving Aerial Target

et al. 2020

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Passive detection of a moving aerial target is critical for intelligent surveillance. Its implementation can use signals transmitted from satellites. Nowadays, various types of satellites co-exist which can be used for passive detection. As a result, a satellite signal receiver may receive signals from multiple heterogeneous satellites, causing difficult in echo signal detection. In this paper, a passive moving aerial target detection method leveraging signals from multiple heterogeneous satellites is proposed. In the proposed method, a plurality of direct wave signals is separated in a reference channel first. Then, an adaptive filter with normalized least-mean-square (NLMS) is adopted to suppress direct-path interference (DPI) and multi-path interference (MPI) in a surveillance channel. Next, the maximum values of the cross ambiguity function (CAF) and the fourth order cyclic cumulants cross ambiguity function (FOCCCAF) correspond into each separated direct wave signal and echo signal will be utilized as the detection statistic of each distributed sensor. Finally, final detection probabilities are calculated by decision fusion based on results from distributed sensors. To evaluate the performance of the proposed method, extensive simulation studies are conducted. The corresponding simulation results show that the proposed fusion detection method can significantly improve the reliability of moving aerial target detection using multiple heterogeneous satellites. Moveover, we also show that the proposed detection method is able to significantly improve the detection performance by using multiple collaborative heterogeneous satellites.

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Accurate and Rapid Broadcast Ephemerides for Beidou-Maneuvered Satellites

Cited by 7 publications

References 31 publications

Recover the abnormal positioning, velocity and timing services caused by BDS satellite orbital maneuvers

Recover the abnormal positioning, velocity and timing services caused by BDS satellite orbital maneuvers

Passive Detection of Moving Aerial Target Based on Multiple Collaborative GPS Satellites

Using Heterogeneous Satellites for Passive Detection of Moving Aerial Target

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