Using of spirent GPS/Galileo HW simulator for timing receiver calibration

Grunert, U.; Thoelert, Steffen; Denks, Holmer; Furthner, Johann

doi:10.1109/plans.2008.4570009

Cited by 8 publications

(10 citation statements)

References 1 publication

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“…The uncertainty of receiver calibration is mainly caused by antenna, cable, software and measurement repeatability. And it is usually within 2 ns [19,20]. So the inherent delay of the receiver is (41 ± 2) ns, which is less than 0.05' in angle.…”

Section: Gps Receiver's Time Delaymentioning

confidence: 99%

Online Calibration Method for Current Sensors Based on GPS

Shuang¹,

Li²,

Li³

2019

Energies

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At present, most sensor calibration methods are off-line calibration, which not only makes them time-consuming and laborious, but also causes considerable economic losses. Therefore, in this study, an online calibration method of current sensors is proposed to address the abovementioned issues. The principle and framework of online calibration are introduced. One of the calibration indexes is angular difference. In order to accurately verify it, data acquisition must be precisely synchronized. Therefore, a precise synchronous acquisition system based on GPS timing is proposed. The influence of ionosphere on the accuracy of GPS signal is analyzed and a new method for measuring the inherent delay of GPS receiver is proposed. The synchronous acquisition performance of the system is verified by inter-channel synchronization experiment, and the results show that the synchronization of the system is accurate. Lastly, we apply our online calibration method to the current sensor; the experimental results show that the angular difference and ratio difference meet the requirements of the national standard and the accuracy of the online calibration system can be achieved to 0.2 class, demonstrating the effectiveness of the proposed online calibration method.

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Section: Gps Receiver's Time Delaymentioning

confidence: 99%

Online Calibration Method for Current Sensors Based on GPS

Shuang¹,

Li²,

Li³

2019

Energies

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“…Nevertheless the proper ratio of both systems noise contribution must be more closely studied. In u B , 2 we have included the calculated uncertainty of the GPS link, and the final uncertainty for the GPS-calibrated TWSTFT link is summarized in Table 4.…”

Section: Twstft Link Calibrationmentioning

confidence: 99%

“…The first is carried out by GPS signal simulators [1,2], and although some new developments have been used during the last decade, it still is complex and not widely used. The latter has been the one used e.g.…”

Section: Introductionmentioning

confidence: 99%

A GPS calibration trip experience between ROA and PTB

Esteban

Palacio

Galindo

et al. 2009

2009 IEEE International Frequency Control Symposium Joint With the 22nd European Frequency and Time Forum

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For a GPS calibration campaign between ROA and PTB a GTR50 time and frequency transfer receiver from ROA was chosen. The operation performance of GTR50 type receivers has been validated in long term operation during the last years. The travelling GTR50 was also tested in a sequence of shutdowns and restarts to detect time jumps and malfunctions just after the restart and during the following days of operation.In September 2008, the receiver was shipped to PTB and then was operated there for eleven days. One week after it had returned back at ROA, the common-view data showed only a 100 ps difference with respect to the same configuration carried out one week before the trip.In this paper we will present the calibration results of this GPS link, and an evaluation of its type A and B uncertainty. The time transfer results were achieved by using C/A, P3 and also carrier phase PPP comparison techniques. We finally extrapolate these results in order to calibrate the two-way satellite time and frequency transfer (TWSTFT) link between ROA and PTB, using one month of data, and involving one GTR50 from ROA and one Ashtech Z-12T from PTB.We show that a TWSTFT link can be calibrated by means of GPS time comparisons with an uncertainty below 2 ns, and that potentially even sub-nanosecond uncertainty can be achieved.

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“…sliding window method and discrete wavelet method are introduced in this paper. The results of calculation indicate that discrete wavelet transform can decrease the error caused by GPS time receiver j itter effectively.The main factor to influence synchronization between time transmission receiver and ground atomic clock is: Doppler frequency excursion, ionosphere, troposphere and the receiver itself [2][3][4] . So it has time transmit error in the receiver.…”

mentioning

confidence: 99%

“…The main factor to influence synchronization between time transmission receiver and ground atomic clock is: Doppler frequency excursion, ionosphere, troposphere and the receiver itself [2][3][4] . So it has time transmit error in the receiver.…”

mentioning

confidence: 99%

GPS time transfer smooth using discrete wavelet

Huang¹,

Zu²

2009

2009 International Conference on Mechatronics and Automation

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Time service is the precondition of precise navigation in radio navigation system, the cesium atomic clock of high stability is used in this system as frequency reference and GPS time receiver is used. To solve the problem of system synchronize error caused by satellite movement , Doppler frequency shift, ionosphere refraction, etc. sliding window method and discrete wavelet method are introduced in this paper. The results of calculation indicate that discrete wavelet transform can decrease the error caused by GPS time receiver j itter effectively.The main factor to influence synchronization between time transmission receiver and ground atomic clock is: Doppler frequency excursion, ionosphere, troposphere and the receiver itself [2][3][4] . So it has time transmit error in the receiver. Discrete wavelet is used to deal with the time difference measured by the time counter in this paper, using signal decompose and destruction treat the difference between atomic clock and time transmission receiver to decrease system position error caused by GPS time receiver. II. SYST EM CONSTITUTION Ind ustria l Computer IOMllz Cesi um atomic clock Sig na l ge nerator l PPS IPPS Cou nter PM668 1 Hig h speed compara tor GPS time receiver , --_ _-----, IPI'S , -----, Fig. I Structure of time synchronization partTime synchronization trigger is a tim e synchronization equipment in the navigation system, the equipment is connected with the GPS time receiver and atomic clock, the main function of the equ ipment is to choose time synchronization standard, the trigger generate two channel signals of the same frequency and steep rising edge pulse through trigger circuit according to the PPS from time synchronization standard. One of the channel is connect to atomic clock for synchronization, the other is connected to the high speed counter in order to measure the synchronize difference between the atomic and the time standard.Because each synchronized atomic clock and GPS receivers are at the different location and work in the different environment, after the GPS receiver time transferring, the The synchronization part structure in radio navigation system shows in Fig.l. The GPS receiver PPS signal is used as time standard in the synchronization part and the GPS pulse signal is disposed to a steep rising edge pulse through the synchronization trigger, then connected with atomic clock synchronization port, providing precise time standard to the system. Sate llite /Ĩ . INTRODUCTIONThe position of receiver is derived by its distances to different transmitting stations and the distances are measured by the delays between the transmitting stations and the receiver of the radio signals in radio navigation system. In reality the delay times are derived by the signal phase difference after propagation from different transmitting stations. Radio wave transmits at the speed of light that means one nanosecond synchronization error in transmitting station will equivalent to 0.3 meter distance measuring error in the receiver. Therefore time synchroniz...

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Using of spirent GPS/Galileo HW simulator for timing receiver calibration

Cited by 8 publications

References 1 publication

Online Calibration Method for Current Sensors Based on GPS

Online Calibration Method for Current Sensors Based on GPS

A GPS calibration trip experience between ROA and PTB

GPS time transfer smooth using discrete wavelet

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