The invention provides a method and system for improving the communication rate of a LoRa network The method comprises the following steps: networking the LoRa network to obtain a networking network, scanning a network transmission rate channel in the networking network, obtaining a scanning result according to a preset signal strength threshold, setting the transmission rate of the networking network according to a scanning result, monitoring the networking network with the transmission rate adjusted in real time, processing abnormality when finding the same, and carrying out maintenance according to a preset maintenance period In the entire process, the transmission rate of the LoRa network is reasonably set according to the scanning result of the network transmission rate channel in the networking network, and the transmission rate of the LoRa network can be effectively improved

Method and system for improving communication rate of LoRa network

A multiple access method for improving data transmission reliability and stability comprises the following steps: 1) after initialization, a master communication node sends a broadcast network access message to a bus, and slave communication nodes on the bus make responses to access a network and enter a ready state; 2) the master communication node divides all the slave communication nodes that have accessed the network on the bus into N priorities, and carries out polling access to all the slave communication nodes on the bus according to the priorities; 3) when polled by the master communication node, each slave communication node chooses to send monitoring data or a network exiting application to the master communication node according to conditions; 4) after receiving response signals and processing the received signals, the master communication node sends the broadcast network access message for a second time, and the new or pending slave communication nodes that need to access the network can carry out new network access operation when the network access broadcast is monitored; and 5) after completion of the polling on all the slave communication nodes in the network, the master communication node determines priorities of the slave communication nodes for a next polling according to data volumes sent by all the slave communication nodes during the current polling. The method provided by the invention has the advantage that the data communication reliability and stability are improved.

Multiple access method for improving data transmission reliability and stability

In a wireless communication system, a wireless transmitter generates a TS packet that includes a PCR value based on a timer value for a time preceding an offset time from start time of a PCR time slot and transfers a wireless frame that includes the TS packet with the PCR value at start time of the PCR time slot. The wireless receiver receives the wireless frame that includes the TS packet with the PCR value at the PCR time slot, measures propagation time of the wireless frame between the start time of the PCR time slot and time when the wireless frame that includes the TS packet with the PCR value is received, obtains sum of the offset time and the propagation time as delay time of the PCR value, and adjusts its timer value based on the PCR value acquired from the wireless frame and the obtained delay time.

Wireless communication system, wireless communication device, and wireless communication method

The invention discloses a system and a method for wireless networking of modules inside a robot. The system comprises a main control unit, a servo control subsystem, a power supply management subsystem, a movement control subsystem and a wireless communication unit, wherein the movement control subsystem comprises an expression control subsystem. According to the system and the method for wireless networking of the modules inside the robot, a wireless communication technique of short distance and low power consumption is adopted to network the modules inside the robot, a communication mode of limited cables can be replaced, electric faults caused by long-term abrasion and bending of cables can be eliminated, and thus the security and the reliability of the robot can be improved. In addition, any nodes of the wireless network can perform data communication, and when modules are added or removed, the wireless network has an automatic remediation function and is short in network time delay, relatively high in response speed, low in power consumption, high in communication speed, good in reliability and high in security.

System and method for wireless networking of module inside robot

The invention provides an anti-collision method, an anti-collision system and an engineering machine. The anti-collision method is used for preventing the booms of a plurality of the engineering machines from being collided, and comprises the following steps: step S10, acquiring a distance d between the rotation centers of the booms of the first engineering machine and the second engineering machine in the plurality of the engineering machines; step S20, acquiring the attitude information of the booms of the first engineering machine and the second engineering machine; step S30, determining whether a collision risk exists or not according to the distance d and the attitude information of the booms of the first engineering machine and the second engineering machine, and if so, determining the collision range of the booms of the first engineering machine and the second engineering machine, and determining a shutdown range according to the collision range; and step S40, when the boom of the first engineering machine enters the shutdown range, stopping the boom of the first engineering machine. The technical scheme of the invention effectively solves the problem that collision easily occurs among cranes in the prior art.

Anti-collision method, anti-collision system and engineering machine

The invention discloses a hierarchical routing algorithm based on a distributed type wireless aggregation network. The algorithm comprises the following steps of clustering of a wireless information interactive network, wherein the clustering is characterized by comprising the steps of utilizing nodes in the network to build a plurality of clusters by a cluster strategy, enabling each cluster to contain multiple common nodes and a cluster main node, and carrying out cluster management and cluster interior information interaction under the control of the cluster main nodes; building of the distributed type wireless aggregation network, wherein the building is characterized by comprising the steps of on the basis of the clusters of the wireless information interaction network, utilizing a series of aggregation nodes to build a distributed type hierarchical wireless aggregation network, reducing the data throughput pressure of the cluster main nodes, providing support for the inter-cluster information interaction of the distributed type information interaction network, and managing and optimizing the whole network; and designing of a hierarchical routing algorithm based on the distributed type wireless aggregation network, wherein the designing is characterized by comprising the steps of providing a lightweight routing protocol based on the cluster strategy and the distributed type wireless aggregation network, obtaining a node route list in the whole network range in the process of adding nodes into the network by the protocol under the conditions of smaller channel bandwidth and controlled cost, carrying out route management on the network, and addressing and routing all nodes in the network.

Hierarchical routing algorithm based on distributed type wireless aggregation network

The invention discloses a design method for an efficient wireless information interaction network protocol. In particular, a wireless channel access protocol is designed by using an information interaction technology on the basis of the physical layer of a wireless self-organizing network. The method comprises self-organizing networking, a channel access control method and a back-off algorithm of a signal access protocol; meanwhile a network transmission rate dynamic control protocol based on automatic priority adjustment is provided, the network bandwidth is distributed reasonably by performing dynamic adjustment of different priorities on in-network nodes, and distributed detection of data information is realized by controlling the rates of different nodes as required, so that high adaptability and universality are achieved. According to the efficient wireless information interaction network protocol, efficient information interaction among nodes is realized, good service quality is ensured, and a complete framework structure is built for the wireless information interaction technology.

Design method for efficient wireless information interaction network protocol

The invention relates to an active safe operation method for a tower crane group. The active safe operation method comprises the following steps: setting conditions for an equal-altitude tower crane, an unequal-altitude tower crane, a high-altitude tower crane tower arm, a low-altitude tower crane drawbar and a movable arm tower crane to safely pass through a crossover area of the tower crane group according to operation characteristics of the tower crane group; taking the condition for the tower cranes to safely pass through the crossover area as a restraint, establishing a repulsive force potential field model and a gravity potential field model for active safe operation of the tower crane group; calculating negative gradient of the potential field models so as to obtain potential field gravity and potential field repulsive force of the tower cranes, decomposing and then synthesizing the potential field gravity and the potential field repulsive force of the tower cranes in an amplitude-varying direction, a revolving direction and a lifting direction of the tower cranes, thereby obtaining resultant force, in the amplitude-varying direction, the revolving direction and the lifting direction, of the tower cranes so as to carry out an active safe operation decision of the tower cranes. The active safe operation method has the beneficial effects that: the potential field gravity and the potential field repulsive force are changed according to relative positions of the tower cranes, so that movement directions of lifting, amplitude-varying and revolving mechanisms of the tower cranes are changed, and therefore, active safe operation of the tower cranes is realized, and operation efficiency of the tower crane group is improved.

Active safe operation method for tower crane group

The invention relates to a tower crane active safety operation method in a multi-obstacle environment. The method comprises: performing projection on all obstacles in operation range of a tower crane in the horizontal plane to be used as an original forbidding area of the tower crane, and based on operation characteristics of the tower crane, correcting the original forbidding area; and determining an operation buffering area of the tower crane for achieving that the tower crane can not enter the forbidding area due to inertia operation and can stop at a target point correctively, setting a relative position gravitational force potential field at the target point of the tower crane by taking a set of the forbidding area and the buffering area as a constraint condition, setting repulsive force potential fields at the obstacles, and calculating the negative gradient of a potential field function to obtain potential field gravitational force and potential field repulsive force applied on the tower crane, so that the tower crane can avoid the obstacles actively under the common action of the potential field gravitational force and the potential field repulsive force, the active safety operation of the tower crane is achieved, switching times of moving states of the tower crane can be reduced to the greatest extent, and technical requirements on a tower crane driver are reduced.

Huang Jianfeng

Papers

Hierarchical routing algorithm based on distributed type wireless aggregation network

Design method for efficient wireless information interaction network protocol

Active safe operation method for tower crane group

Tower crane active safety operation method in multi-obstacle environment