The invention relates to an antenna with high safety. The antenna comprises a main body, a rain shielding mechanism, a fixing box and a storage mechanism. The storage mechanism comprises a buffer plate, a lifting box, a damping assembly, a control assembly, two lifting assemblies and a plurality of springs. The damping assembly comprises two elastic ropes and two damping units. Each damping unit comprises a damping rod, a piston, an air cylinder and an air rod. The control assembly comprises a moving block, a control switch and two moving units. Each moving unit comprises a moving box, a moving plate, a moving rod and a connecting pipe; the rain shielding mechanism comprises two rain shielding assemblies. The rain shielding assembly comprises a supporting rod and a baffle. According to thehigh-safety antenna, the storage mechanism is arranged and thus the function of accommodating the main body during an earthquake is realized, so that the probability that the main body is broken anddamaged due to collision is reduced, the safety of equipment is improved; the function of shielding rain for the main body is realized through the rain shielding mechanism, the main body is preventedfrom being corroded by rainwater, the service life of the antenna is prolonged, and the practicability of the equipment is improved.

Antenna with high safety

There are few uniform models for networks in the real world. This article selects the communication network for study. Usually, when the communication base station exceeds its capacity, a common measure is to transfer the overloaded part of the node to relieve the communication system. This paper introduces the logistic function as the probability function of node failure and develops a cascading failure model with the features of the communication network. Based on the wireless mesh network (WIN) also known as multi-hop mesh network (MHMN) technique to transfer the overloaded part, a new measure which is expanding the node capacity to impact the network vulnerability is discussed. Case study demonstrates the existence of a threshold value for node capacity expansion factor keeping a good balance between cost and network vulnerability and proves the threshold value in the communication network in the real world.

A cascading failure model of communication network with logistic function and node capacity expansion strategy

The invention discloses a satellite large-scale MIMO (Multiple Input Multiple Output) wide-coverage precoding transmission method, which utilizes precoding to generate a wide-coverage power pattern and can solve the power coverage problem of large-scale MIMO public signal transmission of a low earth orbit satellite. The method comprises the following steps: calculating an angle range covered by apower pattern based on a triangular geometrical relationship by utilizing information such as the height of a satellite above the sea level and the average radius of the earth; constructing an optimization problem by taking the minimum and maximum improved Cramer-Rao bound as a target and taking the equal transmitting power of each antenna as a constraint condition; and solving a precoding matrixbased on a non-monotonic conjugate gradient method on the manifold. According to the invention, the capacity of the satellite power amplifier can be fully utilized, and the average receiving power andthe minimum receiving power in the coverage range are high.

Satellite large-scale MIMO wide-coverage precoding transmission method

The utility model relates to the technical field of road locomotives, and discloses a locomotive radio station antenna mounting base, which comprises a fixed seat, a mounting seat and a radio stationantenna body, the fixing base is arranged to be of a groove type structure A plurality of groups of damping springs are arranged at the inner bottom of the fixed seat in a rectangular shape; the topof the damping spring is elastically connected with a group of mounting seats; eight groups of threaded rods are equidistantly mounted on four sides of the top of the fixed seat; a stop lever is sleeved on the threaded rod; the threaded rod positioned on the upper side of the stop lever is in threaded connection with a locking nut; a vertical sliding rod is fixedly installed in the center of the top of the installation base and sleeved with a sliding sleeve, transverse connecting blocks are symmetrically connected to the left side and the right side of the sliding sleeve, hydraulic rods parallel to the sliding rod are fixedly installed at the bottoms of the connecting blocks, and hydraulic cylinders fixed into the installation base are arranged at the bottoms of the hydraulic rods The utility model has the advantages of convenient disassembly and assembly, high stability and adjustable height

Locomotive radio station antenna mounting base

The invention discloses a multi-beam high-throughput satellite communication system based on MIMO and an implementation method thereof. The satellite system comprises a plurality of gateway stations,the gateway stations are bidirectionally connected to satellites through feeder line links, the satellites are bidirectionally connected to user terminals through user links, the information interaction path comprises that the gateway stations are transmitted to the user terminals through the satellites and the user terminals are transmitted to the gateway stations through the satellites, and thegateway stations are connected to a core network; feed multi-beam bands of a plurality of gateway stations are aggregated, the required bandwidth is increased by utilizing frequency multiplexing, high-throughput satellite communication is realized by utilizing a multipoint beam structure, and higher service flexibility is achieved.

Multi-beam high-throughput satellite communication system based on MIMO and implementation method thereof

In order to establish a high-quality cascading failure model of communication network, the influence of load parameters, capacity parameters and network evolution step size on the invulnerability of network cascading is analyzed by numerical simulation under the load capacity nonlinear model and load local priority redistribution principle. A communication network model based on cascading failure is proposed. The experimental results show that each parameter has an optimal value under the standardized failure node number measure and the objective function measure considering performance and cost. Under the condition of fixed load parameters, the optimal combination of capacity parameters is obtained, which makes the network have the strongest cascading invulnerability, which has certain reference value for the design of cascading failure model of actual combat network.

An analysis of the invulnerability for communication networks base on Cascading failure model

In order to improve the information sharing and connectivity of Space-based Information Networks, satellite laser communication has become the preferred communication mode of the next generation space transmission network. Besides, which is also an important direction of future satellite research, and it has become a key technology for the construction of large-capacity data relay satellite system. In this paper, based on Erlang relay theory, the relay capability of GEO three-satellite structure relay satellite system with laser links and large longitude interval is simulated and analyzed, and resource scheduling algorithm and LEO constellation supplement are proposed to improve the relay performance of the system.

Jing Feng

Papers

Locomotive radio station antenna mounting base

Multi-beam high-throughput satellite communication system based on MIMO and implementation method thereof

An analysis of the invulnerability for communication networks base on Cascading failure model

Research on Access Capability of Laser Link GEO Data Relay Satellite System Based on Erlang Relay Theory