35results about How to "Reduce transmission interference" patented technology

The invention discloses an unmanned aerial vehicle tracking method based on an embedded platform. The problem that an occluded vehicle tracked by an unmanned aerial vehicle is lost in the prior art is solved. The method comprises the steps that 1 a vehicle classifier is trained and a map is marked; 2 an image is acquired, and a tracked target is initialized; 3 an image is acquired for target tracking; 4 the classifier is used to determine whether the target is occluded, and if so, the step 5 is carried out, otherwise the step 8 is carried out; 5 whether the target is in an occluded area of the map is determined, and if so, the step 6 is carried out, otherwise the step 7 is carried out; 6 target detection is carried out in the occluded area; the unmanned aerial vehicle hovers; and the step 9 is carried out; 7 the target location is predicted; 8 according to the target, the flight of the unmanned aerial vehicle is controlled; 9 whether the step is end is determined, and if so, tracking is ended, otherwise the step 3 is back. According to the invention, the occluded target can be detected and tracked; the tracking robustness is improved; and the method can be used to track vehicles on urban roads.

Biasing and scheduling transmission of data for access point transceivers. A transmission period of the transceivers is biased in adjacent cells into a plurality of time slots such that the biasing reduces interference among adjacent cells. The transceivers are then scheduled to transmit data packets during a selected time slot of the plurality of time slots that is distinct from each other.

The invention belongs to the technical field of wireless communication and discloses a delay tolerant network (DTN) routing strategy under light-weight infantry combat brigade scene and based on a messenger directly under data. The messenger directly under the data comprises a routing sequence and a transmission information sequence, the routing sequence represents a moving sequence and is composed of serial numbers of transmission nodes, and a first number and a last number of the routing sequence are only a source node. The transmission sequence represents information which a transmitted by digital distribution frame (DDF) to each node, when the DDF reaches one target node and after the DDF finishes transmitting the information which a given by a data source to the node, the information is removed from the information sequence, the data source controls the messenger directly under the data, the other nodes can not request the DDF to conduct independent transmission, the DDF moves according to the routing sequence provided by a list, and finally the DDF returns to the data source. The DNT routing strategy of the messenger directly under the data has the advantages of being high in transmission efficiency and little in transmission interference.

The invention provides a multi-point blasting system and working method based on optical fiber power supply, including optical fiber, laser, photovoltaic cell, pulse generator and detonation device. The pulse generator modulates and outputs a programmable pulse, and the subsequent laser receives the pulse. Pulse signal and output optical pulse signal, and then transmit to photovoltaic cell through optical fiber, photovoltaic cell converts optical pulse signal into electrical signal, transmits it to detonating device through wire, triggers detonating device to detonate explosives inside detonating device. The control of multiple detonating devices is accomplished through multiple optical fibers, thereby realizing multiple-point blasting. Because the optical fiber is resistant to electromagnetic interference, and the transmission interference between different optical fibers is low, blasting can be completed in special environments (such as anti-high-voltage electricity, strong magnetic field interference), and has strong anti-interference.

The invention discloses a vehicle tracking method for an unmanned aerial vehicle based on an embedded platform, which mainly solves the problem in the prior art that the unmanned aerial vehicle loses tracking when vehicle tracking is blocked. The implementation steps are: 1. Train the vehicle classifier and mark the map; 2. Get a frame of image and initialize the tracking target; 3. Get a frame of image for target tracking; 4. Use the classifier to judge whether the target is blocked, if so, Go to step 5, otherwise go to step 8; 5. Determine whether the target is in the occluded area of ​​the map, if yes, go to step 6, otherwise go to step 7; 6. Perform target detection in the occluded area and make the drone hover, go to step 9; 7. Predict the target position; 8. Control the flight of the UAV according to the target; 9. Determine whether it is over, if so, end the tracking, otherwise return to step 3. The invention can detect and track the blocked target, improves the tracking robustness, and can be used for tracking vehicles on urban roads.

The invention discloses a method and device for sending an enhanced physical downlink control channel. The method includes: determining the starting position of the ePDCCH in a subframe according to high-level signaling and / or preset rules; sending the pilot frequency and bearer of the ePDCCH Data on ePDCCH. Through the present invention, the interference between the ePDCCH and the downlink control channel is reduced, and the efficiency of downlink transmission is improved.

The invention discloses a wireless Internet of Things system and method for monitoring and regulating the humidity of corrugated paper transportation, including: an acquisition module collects water absorption humidity parameters of corrugated paper, video images of corrugated paper, stacking serial numbers of corrugated paper, and car space environment parameters; a wireless Internet of Things transceiver receives and The corrugated paper water absorption humidity parameter, the corrugated paper video image, the corrugated paper stacking number and the compartment space environment parameters are transmitted to the corrugated paper transportation control module; the corrugated paper transportation control module is based on the corrugated paper water absorption humidity parameter, the corrugated paper video The screen, the serial number of the stack of corrugated paper and the environmental parameters of the carriage space generate a control instruction; the carriage adjustment equipment group adjusts the environmental parameters of the carriage space of the target corrugated paper stack according to the control instruction. The system can comprehensively and accurately reflect the moisture content of corrugated paper in the transport compartment, and then regulate the equipment in the compartment according to the moisture content of the corrugated paper.

The invention discloses an anti-jamming channel switching method suitable for a wireless sensor network. Firstly, according to IEEE802.11 wireless channel distribution and IEEE802.15.4 wireless channel distribution, IEEE802.15.4-based wireless sensor network channels are classified. According to the classification results, different types of channel sets are reorganized. The wireless sensor network nodes are classified by the minimum repeated node negotiation method, and correspond to the above-mentioned different types of channel sets. The temporal superframe is divided into multiple time slots, and each time slot is divided into multiple sub-time slots. Network nodes perform wake-up monitoring in corresponding sub-time slots through pseudo-random algorithm or query schedule method. Finally, network nodes perform channel switching according to their own Latin square algorithm and initial channel in each time slot. The method of the invention is improved in end-to-end data average delay, data delay upper limit and delay jitter performance index.