Absolute Calibration of an Ashtech Z12-T GPS Receiver

Petit, Gérard; Jiang, Z.; White, J.; Beard, Ronald; Powers, Edward

doi:10.1007/pl00012865

Cited by 34 publications

(19 citation statements)

References 2 publications

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“…Each measurement for different technique has done 50 times. The uncertainty of absolute delay measurement using oscilloscope observation [11] [12][13] is 1.46ns. The uncertainty of absolute delay measurement using proposed technique is 0.115ns.…”

Section: Simulationmentioning

confidence: 99%

“…The group delay measurement technique for frequency translation devices can't be used [6] [7][8] [9]. The technique of delay calibration employed in GPS receiver channel is the observation method based on high oscilloscope [10] [11][12] [13]. Based on the principles of communication system a fall of BPSK (Binary Phase Shift Keying) signal amplitude occurs near the chip code phase converting point via band-limited channel.…”

Section: Introductionmentioning

confidence: 99%

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Delay calibration algorithm for BOC channel of RNSS using partial correlation

Xiaozhun

Hu²,

Chen

2012

2012 IEEE 14th International Conference on Communication Technology

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The delay caused by navigation signal transmission equipment of RNSS (Radio Navigation Satellite System) is a part of the whole link delay and must be subtracted in the application of positioning and timing. The absolute calibration of the transmission channel is affected the positioning and time transfer accuracy. The proposed delay measurement technique of BOC (Binary Offset Carrier) navigation signal transmission channel is based on digital signal processing. The BOC signal of navigation satellite and the 1PPS (1 Pulse Per Second) generated by navigation time keeping system are sampled in synchronization.The BOC signal data is processed using carrier-phase acquisition. The integral time is less than a period of the PRN (PseudoRandom Noise) sequence. The start point of the PRN sequence is obtained and the absolute delay of BOC channel is calculated. The absolute uncertainty with the proposed algorithm is less than 0.2ns when the sampling frequency is 10 GSa/s.

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Section: Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Delay calibration algorithm for BOC channel of RNSS using partial correlation

Xiaozhun

Hu²,

Chen

2012

2012 IEEE 14th International Conference on Communication Technology

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“…One of the advantages for time metrology laboratories is the computation of the antenna phase centre coordinates by the IGS at the cm level. For the TSA at OP, the latest results are: X = 4 202 777,3831 m Y = 171 367,9881 m Z = 4 778 660,1844 m The delays of the ensemble formed by the Z12-T, the TSA, and the RF cable was differentially calibrated by the BIPM Z12-T travelling receiver, which has been calibrated in an absolute sense [6]. Three differential calibration campaigns have been undertaken by the BIPM: one in March 2001, one in February 2003 and one in June 2004.…”

Section: A Implementation Of the Gps P3 Technique At Opmentioning

confidence: 99%

Recent time and frequency transfer activities at the Observatoire de Paris

Aclikar

Ubrich

Merck

et al. 2005

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.

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Important investigations in the time and frequency transfer have been done during the last four years at the Observatoire de Paris (OP). The goal was twofold: improvement of the GPS comparison technique by the use of dual frequency GPS multi-channel receivers in common-views (GPS P3) and the development of a full two-way satellite time and frequency transfer (TWSTFT) station in the Ku-Band.The advantage of the GPS P3 technique is the compensation of the ionospheric delays. The GPS P-Code is transmitted simultaneously on both carriers L1 and L2, and the dualfrequency multi-channel GPS receiver Ashtech Z12-T allows for the so-called P1 and P2 measurements. A simple linear combination gives the ionosphere free P3 measurements. The software developed by the Observatoire Royal de Belgique [1] builds from the geodetic RINEX files such P3 data in the CGGTTS format, and the Common-View method is applied. Due to the availability of several simultaneous Common-Views, a selection can be made which improves the short term frequency stability of the results. A typical result on European baselines gives an Allan Time Deviation σ x (τ) below 200 ps over an analysis period lower than 1 d between H-Masers.The TWSTFT technique, a direct comparison between ground clocks through a communication satellite, is a wellknown technique independent from GPS. In this field, OP developed a full Ku-band two-way station with a dual offset antenna, active up/down-converters and a SATRE modem. The station, calibrated in relative mode in 2004, is officially used for TAI since January 2005. A complete uncertainty budget on the two-way measurement has been evaluated giving a combined uncertainty of only 1 ns. Moreover, the realization of a satellite simulator based on an original design [2] is in progress. Such a simulator will permit mainly an absolute difference delay calibration of a two-way station. During the Primary Frequency Standard comparison done in 2004 over 27-days measurement period, it was observed that H-Masers can be reached at only 0,6 d, with a σ x (τ) = 80 ps on the OP-PTB two-way link.

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“…Several variations in the CVGPS technique exist, and the magnitude of the error components depends upon the type and quality of the GPS equipment in use and the way that the data are processed. 11 For example, the differential ionospheric delay can be nearly eliminated by receiving both the L1 and L2 carrier frequencies, certain types of receivers are less sensitive to environmental changes, and certain types of antennas are more effective than others at mitigating multipath. The most sophisticated techniques and equipment can reduce the time uncertainty to a few nanoseconds or less, but the incremental performance gains are relatively small.…”

Section: Cvdo Theory Of Operationmentioning

confidence: 99%

A common-view disciplined oscillator

Lombardi

Dahlen

2010

Review of Scientific Instruments

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This paper describes a common-view disciplined oscillator (CVDO) that locks to a reference time scale through the use of common-view global positioning system (GPS) satellite measurements. The CVDO employs a proportional-integral-derivative controller that obtains near real-time common-view GPS measurements from the internet and provides steering corrections to a local oscillator. A CVDO can be locked to any time scale that makes real-time common-view data available and can serve as a high-accuracy, self-calibrating frequency and time standard. Measurement results are presented where a CVDO is locked to UTC(NIST), the coordinated universal time scale maintained at the National Institute of Standards and Technology in Boulder, Colorado.

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Absolute Calibration of an Ashtech Z12-T GPS Receiver

Cited by 34 publications

References 2 publications

Delay calibration algorithm for BOC channel of RNSS using partial correlation

Delay calibration algorithm for BOC channel of RNSS using partial correlation

Recent time and frequency transfer activities at the Observatoire de Paris

A common-view disciplined oscillator

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