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We address delay calibration of phased array antennas with true time delay. We propose a delay difference estimation method between two elements through space. It is applicable to systems for which wired measurements are impossible. Additionally, phase measurement is not required. In this paper, we demonstrate feasibility of the proposed method in an actual array case and a limited measurement environment...
GNSS timing is currently used worldwide in critical real-time systems that require precise synchronisation or time-stamping at geographically dispersed sites, such as wireless telephone stations, electrical power grids and financial services. For applications where multiple timing equipment needs to be deployed, it is desirable to use low-cost, single-frequency receivers. Together with calibration...
VLBI (Very Long Baseline Interferometry) Terminal Device is a mixed analog and digital conversion system. Since the analog closed loop can't be built, the vector network analyzer can't be used to do delay calibration. In this paper, a delay calibration method of VLBI terminal device based on PCAL (Phase Calibration) signal is proposed. To solve the problem of low computational efficiency of PCAL signal...
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...
High precision of the inter-satellite ranging is very important for the realization of system function for the formation of satellite constellation. The delay of transmitter is a key parameter relating to range. A high accurate delay calibration algorithm of V-band transmitter is developed. The ranging signal and the 1PPS (1 Pulse Per Second) are sampling in synchronization. The sampling frequency...
In order to measure the inter-aircraft distance and their clock offset, we designed a precise ranging and time synchronization system. The system is based on dual one-way ranging (DOWR). In this paper, we first describe the basic fundamental and structure of the system. We then discuss the primary sources of ranging and time synchronization error. We also propose the in-system integrated delay test...
This paper analyzes high-speed source-synchronous network-on-chip data links in terms of yield loss due to delay variations. We show that statistical process variations can significantly reduce yield at high data rates and high bus widths. An on-chip delay calibration architecture for individual calibration of rise and fall delay times is proposed and analyzed on system level using Monte Carlo simulations...
The national metrology institute of France for time and frequency LNE-SYRTE has developed a new microwave satellite simulator to be used for the determination and monitoring of the delay difference in the Ku-band two-way satellite time and frequency transfer (TWSTFT) earth station. Such a device is more and more recommended by the CCTF working group on TWSTFT in order to better evaluate the time transfer...
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