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Aiming at the problem of how to make use of the atomic clocks offered by Micro-PNT to make Global Navigation Satellite System (GNSS) receivers fulfill fast positioning with the recovery of the satellite navigation signal, this paper discusses the fast positioning method which omits the step of frame synchronization and proposes a constellation-triangle selecting algorithm based on high-precision clock...
According to such problems as acquisition terminal and smart meter's real-time deviation is large which has lead to TOU power price and ladder power price policy difficult to successfully implement in electricity information acquisition system, this paper has applied GPS clock synchronization technology and PTP clock synchronization technology in electricity information acquisition system's simulation...
The time synchronization system which uses the BeiDou and GPS as double clock source can receive GPS and the BeiDou satellite signal. The system built-in constant temperature crystal clock or rubidium clock utilizes the "BeiDou bidirectional synchronization method" technology and advanced control algorithm. The core control processor using STM32 chip with high performance, which can achieve...
We performed and succeeded in the time synchronization through the experimental satellite for communication, WINDS using PTP [1]. PTP is the protocol for time synchronization which is also called IEEE 1588. It is said that PTP is more accurate than NTP which is popular for us as the time synchronization protocol because of their synchronization algorithm. WINDS is the communication satellite launched...
TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) opens a new era in spaceborne radar remote sensing [1]. A single-pass SAR interferometer with adjustable baselines in across- and in along-track directions is formed by adding a second (TDX), almost identical spacecraft to TerraSAR-X (TSX) and flying the two satellites in a closely controlled formation. With typical across-track baselines...
This paper recalls the essential elements of the joint TerraSAR-X and TanDEM-X ground segment. It elaborates on some topics which are usually not in the primary focus from a pure SAR technical point of view, e.g. the flight formation. Both commissioning and early routine phase results from operating the joint TerraSAR-X and TanDEM-X ground segment are given.
TanDEM-X is a high-resolution interferometric radar mission with the main goal of providing a global digital elevation model (DEM) of the Earth surface by means of single-pass X-band SAR interferometry. It is, moreover, the first genuinely bistatic spaceborne SAR mission, and, independently of its usual quasi-monostatic configuration, includes many of the peculiarities of bistatic SAR. An experimental,...
After the recent launch of the TanDEM-X satellite, the twin of TerraSAR-X, its demanding commissioning phase has started. On the one hand, it has to ensure the same monostatic operation performance as TerraSAR-X. On the other hand, the bistatic aspects have to be verified, which are essential for the acquisition of the global digital elevation model (DEM). This has to be done in a limited time period...
This paper is focused on the measurement and evaluation of the relative timing characteristics of GPS (global positioning system) timing receivers for time synchronization application. I-Lotus M12M oncore timing modules optimized for the timing applications were utilized as tested timing modules. These modules represent the next generation of the low cost GPS timing receivers which expect accuracy...
For Global Navigation Satellite System (GNSS) technology, the accuracy of navigation signals (time reference signal) is very important. To improve the accuracy of the navigation signals, exact time control of the satellite and highly accurate clock synchronization between satellites and ground stations are required. JAXA plans to conduct a time synchronization experiment for future global navigation...
A novel 50% duty-cycle corrector (DCC) of digital signal processing (DSP) systems, designed with a purely digital phase-blending technique, is presented in this paper. The novel features of the proposed DCC includes a higher reliability against process, voltage and temperature variation due to the use of the synchronous mirror delay (SMD) technique, no-skew output clock, and a much faster duty-cycle...
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