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Police Hunt Suspect After Explosion in French City of Lyon

LYON, France (AP) - French police on Saturday hunted a suspect believed to have deposited a paper bag containing a device that exploded Friday, wounding 13 people on a busy pedestrian street in the city of Lyon.France's counter-terrorism prosecutor, Remy Heitz, said an investigation has been opened for "attempted murderer in relation with a terrorist undertaking" and "criminal terrorist association."He said no group has claimed responsibility for the explosion yet. Regional authorities said 13 people suffered mostly minor injuries but 11 were still in the hospital on Saturday morning.French President Emmanuel Macron called the explosion an "attack" during a live interview Friday about the European Parliament elections that run through Sunday.Heitz described video surveillance that showed the suspect heading toward the center of Lyon on a bike Friday afternoon. The man was seen arriving on foot, pushing his bike along the pedestrian-only Victor Hugo street, then leaving paper bag on a concrete block in the middle of the street near a bakery.The suspect immediately returned to his bike and left by the same path. One minute later, the explosion shattered the glass of a refrigerator in the bakery, Heitz said.Investigators at the scene have found screws, metallic balls, batteries, a triggering device that can be used remotely and plastic pieces that may come from the explosive device.Police issued an appeal for witnesses Saturday with a photo of the suspect from video surveillance. They described the man as "dangerous."Heitz said police will release more photos soon. The man was wearing a cap and sunglasses that partially hid his face.Local authorities said security has been enhanced in France's third-largest city, including with more police and military patrols.The women's World Cup soccer tournament is scheduled to start in France on June 7 and Lyon will host the semifinals and then the July 7 final. After the explosion, Interior Minister Christophe Castaner sent instructions for Lyon authorities to strengthen security for "public sites and sporting, cultural and religious events."On Victor Hugo street, police removed their cordon around the explosion area and the atmosphere Saturday was almost back to normal with people doing their shopping - except for the chalk lines drawn by forensics on the ground."It was scary," said Gisele Sanchez, owner of a cloth shop in front of the bakery. Large wood planks protected her shop window, which was impacted by the blast. Police found screws, metallic balls and batteries in her shop yet Sanchez was able to reopen on Saturday morning.France is jittery over a spate of attacks in recent years, some of them deadly, carried out by people ranging from extremist attackers to mentally unstable individuals. Five people were killed Dec. 11 in an attack on the Christmas Market in Strasbourg, in eastern France. The alleged killer, Cherif Chekatt - killed by police - had pledged allegiance to the Islamic State group.___Corbet reported from Paris.

Police Hunt Suspect After Explosion in French City of Lyon 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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