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China Urges Sweden to Heed Concern Over Tourists Ejected From Hotel

BEIJING (Reuters) - China on Monday urged Sweden to take seriously its concern over the removal by police of three Chinese citizens from a hotel in Stockholm, after the incident sparked uproar on Chinese social media and an unusually strong response from Beijing.

Police forcibly ejected a Chinese man surnamed Zeng and his parents from a hotel in Stockholm in the early hours of Sept. 2 after they arrived a day before their booking and were asked to leave, according to Chinese state media.

China has lodged representations with Sweden about the incident and has asked for an immediate response to the complaint, China's foreign ministry spokesman Geng Shuang told a regular briefing.

"We again urge Sweden to take China's concerns seriously, and to take practical measures to protect the security and legitimate interests of Chinese tourists," he said.

Sweden had not yet responded to China's requests for an update on the investigation, which was not in accord with diplomatic convention, Geng added.

Swedish prosecutor Mats Ericsson told the Aftonbladet daily that no preliminary investigation had been initiated because "we made the assessment that no crime on the part of the police had been committed".

A Swedish government source, who declined to be identified, said Sweden believed that China was exaggerating the incident because Sweden had spoken out over the case of a Swedish citizen detained in China.

"We think it's related to Gui Minhai," said the Swedish government source, referring to a Swedish, Hong Kong-based bookseller who has been held by Chinese authorities since 2015 after he was abducted in Thailand.

"Sweden and the EU have repeatedly called for his release and Chinese authorities don't like that." An official newspaper of the ruling Chinese Communist Party, the People's Daily Overseas Edition, earlier accused Sweden of hypocrisy.

"Some Western nations, including Sweden, always praise themselves for their human rights, freedom and equality. But when it comes to China's people and issues, they seem to often show a different face, a different set of standards." A video clip of the tourists wailing and crying as they sat on the ground outside the hotel door has drawn mixed reactions from Chinese internet users.

Some blamed the Swedish police for mistreating the tourists, but many lambasted the travellers, saying their behaviour was unseemly and embarrassing.

"I really find these types of people too infuriating. Could they please not make a spectacle of themselves and give the motherland some face?" said one user wrote on the Weibo social media platform.

China Urges Sweden to Heed Concern Over Tourists Ejected From Hotel 1

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Problems of Phased Array Ground Penetrating Radar Detection System
Although GPR has been widely used in hydrology, engineering, environment and other fields, many basic theoretical and technical problems have not been fundamentally solved, so the real advantages of GPR have not been brought into full play.The main problems existing in GPR technology include:1) The detection depth is shallow, and the contradiction between detection depth and resolution cannot be overcome. Increasing detection depth means sacrificing detection resolution;2) Multiple spread and other clutter jamming are serious, and there has been no good elimination method, which exists in radars at home and abroad;3) The influence of medium unevenness is great and can not be eliminated, resulting in difficulty in obtaining necessary velocity data;4) The data collection method of single sending and single receiving can provide limited information for post-processing and interpretation.The above problems are fatal defects for GPR. Although many geophysicists, electromagnetic experts and geophysical workers have done a lot of research and improvement on radar antenna design, signal processing and underground target imaging, these works are only partial modifications to the existing GPR system. In order to develop GPR technology, we must update our ideas and solve the problems from the fundamental principle.In view of this situation, experts proposed to develop a new GPR system - phased array GPR detection system in 1999.The basic research idea is to replace the current monopole radar antenna with the phased array radar antenna by using the relatively mature military phased array radar technology. Its purpose is to gather the electromagnetic wave into a narrow beam to transmit underground (or detection object) through the phased array technology, and receive the radar echo signal reflected by the target by using the multi-channel acquisition technology, The advanced data processing is carried out, and finally the three-dimensional image of the internal structure of the detection object is given.Development prospect of ground penetrating radar technologyIt is worth noting that at present, similar products have appeared in the market, such as RIS antenna array series of a company, but these products simply combine multiple monopole antennas into array antennas, which is essentially different from the idea of phased array ground penetrating radar.Because the phased array radar converges the electromagnetic wave into a narrow beam by controlling the phase delay of each channel, the energy is concentrated and the wave front diffusion is small. Therefore, the detection depth of the phased array radar is much larger under the condition of the same frequency and transmission power; On the contrary, under the same detection depth, phased array radar can improve the transmission power, so its resolution is much higher than the existing radar. In addition, since the spherical wave transmission is changed to beam transmission, the influence of medium heterogeneity is much smaller.Secondly, the phased array radar works in a continuous scanning mode and can scan in multiple directions. Therefore, the amount of information is much larger than that of the existing ground penetrating radar. For some special detection work, such as the quality detection of embankment cut-off wall, its role is unmatched by the existing ground penetrating radar (monopole antenna radar can not detect the joints, forks and other defects of embankment cut-off wall at all).Because phased array radar is a multi-channel received signal, multi-channel superposition can be carried out, just like the multiple coverage technology of reflection seismic exploration. Therefore, multiple interference can be greatly eliminated, which is difficult for existing radars. The antenna of high frequency (600mhz-1ghz) phased array ground penetrating radar can be made smaller, and its advantages are unmatched by the existing ground penetrating radar in shallow detection.At present, the system prototype has been completed. The carrier free pulse working system with center frequency of 900MHz is adopted, and the transmitting and receiving antennas are separated. 16 (4 × 4) Transmit channel forming, beam aggregation and scanning 16 (4) × 4) The channel receives the echo, and the optional scanning angles are - 36 °, - 24 °, - 12 °, 0 °, 12 °, 24 ° and 36 °.The software part of the system has rich data processing functions. The main conventional processing includes filtering, gain adjustment, static and dynamic correction, deconvolution, complex signal analysis, time-frequency analysis, etc., and multi-channel data processing, such as velocity analysis, superposition technology, coherence analysis technology, array signal processing, etc. And weak signal extraction, target automatic recognition and inversion interpretation under various clutter interference. A large number of field experiments on concrete detection in Yichang Three Gorges dam are carried out. The experimental results show that the spotlight scanning function of phased array radar has been realized, the penetration depth is greater than 1.5m and the resolution is higher than that of ordinary radar.Editing: hfy
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