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This paper introduces the design of a near realtime BDS/GPS time transfer method. A Beidou data communication module is assembled into a time transfer receiver. The clock difference computation procedure is modified and a customized protocol is designed for comparison data exchange. The time difference of zero-baseline common-clock by GPS and BDS is compared. The performance of this method is almost...
The Calibration Device is used to measure the time delay difference between the transmission and receiving paths inside Two-Way Satellite Time and Frequency Transfer (TWSTFT) earth station, it can improve the time comparison precision. A new calibration device for TWSTFT has been developed recently at Beijing Institute of Radio Metrology and Measurement (BIRMM). The signal paths inside calibration...
This paper describes a time transfer system that allows timing laboratories, including metrology institutes and other designated institutions, to compare the local realization of Coordinated Universal Time (UTC) with each other. The time transfer system could calculate the difference between the local time and GPS time, and the difference between the local time and BDS time. It stores the measurement...
This paper gives a test method of BeiDou timing receiver delay. A BeiDou System simulator and a time interval counter were used in the experiments. During the process, the most important step is to calibrate the delay of the simulator. The uncertainty of this method is analyzed to be less than 1.5ns. Using this method, some typical Chinese commercial timing receivers were tested, and the results are...
As one widely-used parallel-imaging method, Generalized Auto-calibrating Partially Parallel Acquisitions (GRAPPA) technique reconstructs the missing k-space data by a linear combination of the acquired data using a set of weights. These weights are usually derived from auto-calibration signal (ACS) lines that are acquired in parallel to the reduced lines. In this paper, a cross sampling method is...
A 2.4-GHz two-point modulation IEEE 802.15.4 (Zigbee) compliant transmitter is presented. This sigma-delta fractional-N PLL based transmitter is optimized for both low-power and low-cost purposes. A novel closed-loop calibration scheme is proposed to minimize the gain mismatch between two modulation points, which is the main source of error in two-point modulation. Fabricated in a 0.15-mum CMOS process,...
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