Performance evaluation of NIM GPS receivers in use for time transfer with PTB

Liang, Kun; Feldmann, Thorsten; Bauch, A.; Piester, D.; Zhang, Aimin; Gao, Xiaoxun

doi:10.1109/eftf.2010.6533694

Cited by 8 publications

(9 citation statements)

References 5 publications

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“…However, mode 1 was proved for NIM receivers to be better than mode 2 (see more details in [4]). In other words, the two receivers should be In terms of section 2, for the link calibration between NIM and PTB, the reference delays of TR at two timing labs will be measured by SRS SR620…”

Section: Modifications and Improvements Of The Calibration Methodsmentioning

confidence: 98%

“…So far, there are two kinds of operation modes for GPS timing receivers [4] , and in those calibration campaigns of the link between ROA and PTB [2] and the link between PTB and METAS [3] , GTR50 that is operated in mode 2 was used as TR for the link calibration. However, mode 1 was proved for NIM receivers to be better than mode 2 (see more details in [4]).…”

Section: Modifications and Improvements Of The Calibration Methodsmentioning

confidence: 99%

“…dependent on the relation between the reference 1PPS and 10MHz inputs [4] and thus will be changed from lab 1 to lab 2. The difference between GTR50 1PPS output that is coherent with or can be linked by some receiver output information to the receiver time scale and the reference 1PPS input is always measured by an internal TIC, and the receiver measurements are corrected by this difference reflecting the receiver internal delay.…”

Section: Either Of the Two Receivers' Internal Delays Ismentioning

confidence: 99%

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Time link calibration method using a homemade GPS traveling receiver

Liang

2011

2011 4th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

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A time transfer link calibration using a GPS traveling receiver is considered as a preferable economic choice for NIM having TWSTFT started. Some specific modifications and improvements of the method for a homemade Traveling receiver are proposed as well as the improved methods for some related measurements for lower uncertainty. Some link calibration results were obtained. MotivationIn order to contribute to the realization of TAI (Temps Atomique International), a calibration of the TWSTFT (Two-Way Satellite Time and Frequency Transfer) link between NIM and PTB is mandatory. At present, there are several kinds of methods for link calibration of TWSTFT. Nevertheless, for TWSTFT link calibration between Asia and Europe, only the methods such as by two TWSTFT portable stations together with two GPS (Global Positioning System) traveling receivers (TRs) [1] and by a GPS traveling receiver (TR) [2] can be considered. Because portable TWSTFT stations are hardly available and the method by GPS costs much less, we are motivated to implement the link calibration using GPS preferably that is demonstrated in the link calibration between ROA and PTB [2] and in the link calibration between PTB and METAS [3] . For the link calibration using GPS, one GPS traveling receiver need be used to do CCD (Common Clock Difference) experiments at two timing labs. Two self-developed NIM GPS receivers (IMEU, a Javad E_GGD board with JNSMARANT_GGD antenna and IMNV, a NovAtel OEMV3 board with 702GG antenna) for time transfer are available as TR.Study on the link calibration using the two receivers would be necessary. Concept of the link calibration by GPSIn this link calibration method [2,3] , firstly we do the CCD experiment with TR (including an antenna and an antenna cable) and the GPS receiver R1 that is used for time transfer at timing lab 1 in this link, both receivers are referenced to UTC(k1) and C1 is got.Likewise do we at timing lab 2 with TR and R2 both referenced to UTC(k2) and C2 is got. Meanwhile, the difference RDD between the reference delays R1 and R2 of TR separately at the different timing labs should be taken into account. Immediately after those the same CCD experiment at timing lab 1 as before that is called closure experiment would be done to verify the stability of the TR internal delay, and the instability will be added into the uncertainty evaluation. Figure 1 illustrates the concept. Supposed there is not any other change except the reference delay, the calibration value can be calculated from Equation (1) and (2).

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Section: Modifications and Improvements Of The Calibration Methodsmentioning

confidence: 98%

Section: Modifications and Improvements Of The Calibration Methodsmentioning

confidence: 99%

Section: Either Of the Two Receivers' Internal Delays Ismentioning

confidence: 99%

See 1 more Smart Citation

Time link calibration method using a homemade GPS traveling receiver

Liang

2011

2011 4th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

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show abstract

“…A self-developed traveling GPS (Global Positioning System) receiver of NIM, NIM acronym IMEU, which is based on a JAVAD E_GGD receiver has been assembled and operated as traveling GPS receiver (TR) at PTB and NIM in succession for that purpose. After the suitability for the purpose of the IMEU receiver had been verified [1], the method using it for link calibrations has been developed [2]. The operation mode of IMEU differs from that of the GTR50 receiver which was used in previous successful calibration campaigns [3,4].…”

Section: Forewordmentioning

confidence: 99%

“…The reference delays RD1 and RD2 of TR were measured by SR620 Time Interval Counters (TIC), the difference RDD of RD1 and RD2 that were calculated according to(1) and the corresponding standard deviations of the measurements are givenin TABLE II.…”

mentioning

confidence: 99%