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Many broadcast protocols have been proposed in Vehicular ad-hoc Network (VANET) for safety applications and traffic efficiency. GeoBroadcast, which the sender sends information to the geographical area, has been standardized by the ETSI Technical Committee ITS. The routing protocol is a key technology satisfying communication requests of high reliability, low delay and universality for GeoBroadcast...
The synthetic aperture Altimeter (SARA) introduces synthetic aperture processing into the conventional radar altimeter (CRA) in the along-track dimension, so both the spatial resolution and precision of SARA are improved. The sub-looks alignment is a key technique in the SARA data processing. In this paper, a method for sub-looks alignment is proposed to correct the varieties of the satellite orbit...
HY-2 satellite, the first ocean dynamic satellite of China, was launched in August 2011, carrying a dual frequency (Ku band and C band) altimeter, to measure the global mean sea level [1]. To provide truly sea level measurements, in-orbit calibration is essential. This paper concerns the transponder in-orbit calibration method. A signal reconstructive transponder for HY-2 altimeter in-orbit calibration...
The traditional method for the extraction of phase calibration (PCAL) signal is inefficient when the number of PCAL tone is large. According to the special spectrum of the PCAL signal, an efficient method based on DFT is proposed for the multi-tones extraction. All the phases of the multi PCAL tones can be obtained in once DFT. The computation amount of the new method doesn't increase with the number...
DTNs are prone to congestion due to limited resource on each node and unpredictable end-to-end delay. We aim to develop an effective congestion control mechanism in this paper. For this purpose, we first identify a list of major congestion factors by analyzing the causes of congestion. We then model the congestion control as a multiple attribute decision making problem (MADM), in which the weight...
In Delay Tolerant Networks (DTNs), the connections between mobile nodes are intermittent and constant end-to-end paths rarely exist. In order to achieve high delivery ratio, most existing DTN routing algorithms favor the ``multi-hop forwarding'' fashion where a message can be forwarded by multiple relay nodes in the hope that one of the employed relay nodes can deliver the message to the destination...
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