Anti Collision Research Articles

Sposób wykorzystania matematycznych modeli do przygotowania i weryfikacji automatycznie sterowanego manewru omijania ruchomych przeszkód

A relevant identification of significant factors affecting the process of anti collision manoeuvre computation in case of moving obstacles, is necessary for getting results reliable enough and describing a proposed trajectory of such a manoeuvre as well as its realisation. The requirement for the appropriate separation, the airplane to obstacle distance, is treated as the relevant index for verification of the course of passing by manoeuvre. Subject matter of this work is the appropriate selection of mathematical models for the subsequent phases of preparation of flight trajectory passing by the obstacles. The impact of selected simplifications of mathematical model on the shape of flight trajectory and the distance between the airplane and obstacles have been studied. Considerations have been illustrated by the results of selected computer simulations of an airplane while carrying out an obstacle avoiding manoeuvre.

Wpływ dynamiki samolotu i jego stanu lotu na bezpieczeństwo wykonania manewru ominięcia ruchomych przeszkód

The exact identification of essential factors affecting the course of evasive manoeuvre, that has been computed to avoid a collision with moving obstacles, is necessary to ensure a safe passing by a moving obstacle. At the same time, during the evasive manoeuvre the pre-defined separation between the airplane and obstacles is required. The matter of presented work is defined as the analysis of influence of factors on execution of anti collision manoeuvre taking into account deformation of flight trajectory and changes of time histories of distance from the airplane to detected obstacles. Attention has been focused on internal interactions, resulting from the essential changes of the airplane’s behaviour. Discussion has been illustrated by selected results of computer simulations, executed for typical manoeuvres performed to avoid obstacles, while affected by adverse impacts of selected factors. The appropriate guidelines have been proposed, that should counteract these adverse effects on realisation of computed manoeuvre.

Design and Construction of a Vehicle Anti–Collision System

Design and Construction of a Vehicle Anti–Collision System

A Lifi Based Data Transmission for Anti Collision System

Abstract A new way of data transmission between two vehicles using light fidelity technology is proposed in this paper. A best way of avoiding accidents can be achieved by the communication between the vehicles. This system can be simplified by using LED bulbs for data transmission. The previously used data transmission technology can be overcome by the newly proposed LIFI technology. The major objective of this system is to achieve reliable communication between the vehicle using a transmitter and a receiver. The communication methods and the operations are presented in detail.

Inter intra vehicular communication

CAN communication based transmission system in vehicle is used to implement an anti-collision system for vehicles that includes a speed sensor for sensing the speed of the vehicle, an ultrasonic sensor for measuring the distance of the vehicle from an object, a system for computing a anti collision distance to the object, an alarm actuated by the system when the sensed distance of the object is equal to or less than the anti collision distance compared by the system, and a brake light actuated upon the actuation of said alarm, and an alert system for driver’s to shift gear of vehicle when the ideal speed is reached, and cornering head light for the vehicle. The data will be transmitted over CAN bus and will be displayed on LCD.

Food Safety Tag Anti-collision Control Based on Collision Detection

In the food safety traceability process, need according to the material label quantities read food labels technique for identifying, batch and measurement with the complexity and irregularity and lead to label information collision, the need for anti collision control. The traditional food safety tracking tag anti-collision control method using symbol frame format sweep of Radio Frequency Identification technology (RFID) to achieve the conflict shunt control purposes, in the expansion of loss was mutation attenuation, resulting in a collision of fault tolerant control effect is not good. Put forward a kind of food safety label conflict detection based anti collision control method. To label bulk read level data fusion, describes the conflict signal generation model of food safety labels, analysis of ultra wide band characteristics of food safety traceability label conflict signal, the realization of the food (food) safety control of planting, breeding, processing, packaging, storage, transportation, sale and consumption activities and food safety label the technology of Radio Frequency Identification (RFID) conflict shunt control, to achieve the purpose of anti collision control. Simulation results show that speed up the anti-collision recognition efficiency, reduces the probability of anti-collision, improves the anti collision detection efficiency, improve food safety identification tag throughput rate, avoid the waste of resources at the same time, it can improve the food safety tracing efficiency and accuracy, it has good application value in the field of food safety monitoring.

Discussing On RFID Tag Conflict Problem

This paper introduces the basic concept, development process, key technology of RFID and related theory. And in view of the key technology of RFID, anti collision algorithm is analyzed. Tag collision algorithm is to solve the reading and writing implement effective communications within the scope of multiple tags at the same time, speaking, reading and writing for communication problems. Under the condition of keep a certain complexity and cost, minimize the search time, improve the efficiency of recognition, is the direction and trend of algorithms. Through the comparison of several kinds of algorithm for collision, clear the necessity of the collision algorithm is improved. The author select dynamic frame ALOHA algorithm, introduces in detail the improved algorithm, and apply it to the system, to improve the recognition efficiency.

Anti Collision and Secured Level Crossing System

road and rail accidents are increasing with the advancement of human errors. Majority of the level crossing positions are not guided by any accident preventive mechanism and even not accompanied by a skilled person. This paper presents an automatic rail gate control system at level crossing positions and accident prevention mechanism. Two vibration sensors are used to control the open and close state of the gate at level crossing position. An ultrasonic sensor is positioned to detect an unauthorized object on the track. Open and Close status of the gate and unauthorized object on the track will be communicated with the central control room using wireless communication protocol. The experimental results proved the proposed mechanism is a prudent approach to safeguard the human and to curtail the train accidents.

Research on Anti-Collision Algorithm of Short Distance Data Communication Based on Binary-Tree Disassembly

This paper puts forward adaptive anti collision algorithm based on two fork tree decomposition. New search algorithm built on the basis of binary-tree algorithm, using the uniqueness of the label EPC, to estimate the distribution of label by slot allocation, the huge and complicated two fork tree is decomposed into several simple binary-tree by search the collision slots for binary-tree, so, it can simplifies the search process. The algorithm fully considers4 important performance parameters of the reader paging times, transmission delay, energy consumption and throughput label, the simulation results show that, the improved anti-collision algorithm is obviously improved performance than other two fork tree algorithm, it is more suitable for RFID anti-collision protocols.

Research on Deep Sea Sonar in Marine Navigation of the Ship Anti Collision

in view of the current situation of ship has collision with sea mountain , design and develop the sonar of ship collision avoidance system based on PLC.its main purpose is to remind the crew in front of mountains and ship automatic collision avoidance. The design is based on the minimum distance of ship and mountain, put forward the system scheme: measure the two objects distance by sonar , using this system as the control core , the information is analyzed and calculated by this system. When the distance between ship and mountains is less than the minimum safe distance.so this system will alarm crews and as deceleration avoidance .

Improved Auto Brake and Avoidance

Abstract: Aiming at the shortage of "ultrasonic ranging vehicle anti-collision alarm system design" , because the anti collision system just avoid having collision in front of the car, without considering the back of the car, in order to avoid hitting the car before and after ,so according to the above problem ,we improve the system.

Four-ary query tree splitting with parallel responses for RFID tag anti-collision

In a radio frequency identification (RFID) system, tags can be identified by a reader when they are within the interrogation zone of the reader. Collisions occur when tags using backscatter technology report their IDs to the reader at the same carrier frequency simultaneously. The performance of tag identification is degraded by collisions, so it is important to address the tag collision problem. Several anti–collision protocols have been proposed for reducing tag collisions. They can be categorised into two classes: ALOHA–based and tree–based protocols. This paper proposes a 4–ary query tree–based anti–collision protocol, namely the parallel response query tree (PRQT) protocol, to improve the performance of tag identification. In the PRQT protocol, the tags with the ID prefix matching either the reader's request bit string or the complementary of the string are arranged to respond in two subcarriers in parallel. The PRQT protocol is analysed, simulated and compared with related ones to demonstrate its advantages.

Energy consumption evaluation framework for passive RFID tag anti-collision algorithms

In passive RFID systems, tag receives energy for communication from the reader, in the absence of on-chip energy source. Hence, a good amount of energy is needed to be transmitted by the transceiver circuit to provide energy to the transponder. Hence, circuit-level energy consumption cannot be ignored in the total energy consumption evaluation of passive RFID systems. Previously, energy consumption evaluation for passive tag anti collision algorithm has been done ignoring circuit-level energy consumption values. This may provide inaccurate results. Here in this paper, an energy consumption evaluation framework for EPC class 1 Gen 2 (passive) based tag anti-collision algorithm has been proposed. This proposed framework includes energy consumed by transceiver and transponder circuits, in total energy consumption estimation for better accuracy.

Automatically Controlled Anti-Collision Manoeuvre and its Numerical Simulation with Disturbances

The article presents the discussion focused on specific features of the problem of flying objects motion when performing an example of anti collision manoeuvre. To realise this task, the structure of automatic control system with appropriate control laws are proposed. The nature of discussed manoeuvre needs the appropriate numerical method for computing desired values of state variables for subsequent phases of objects motion. These values are obtained adequately for their roles in several phases of motion. Numerical simulations are completed for the aircraft performing the anti collision manoeuvre consisted in abrupt change of yaw. Objects behaviour was tested in case of motion affected by disturbances. The analysis of results obtained by numerical simulations makes possible conclusions on stability of objects motion and control system robustness to assumed kind and level of disturbances.

The Design of Ultrasonic Ranging Car Collision Prevention Alarm System

This article in view of the situation of highway automobile rear-end collision accident frequency, designed and developed based on the ultrasonic ranging car anti collision warning system, its main purpose is to get the driver more parking time, thereby reducing the occurrence of accident. The design on the basis of the minimum safety distance model, and puts forward the system solution: by ultrasound to measure the distance of the two cars, using this system as the control core, for the analysis of all kinds of information, when driving distance less than the minimum safety distance control will alarm and stop the car.

Dynamic Frame Sizing with Grouping Slotted Aloha for UHF RFID Networks

Tag collision in a radio frequency identification system (RFID) is an important parameter that affects the overall system performance. Different algorithms have been proposed to efficiently utilize the slots during data transmission between reader and tags that need to be identified. Dynamic Frame slotted Aloha is a widely used anti collision algorithm that can be further divided into two main categories depending upon how the frame selection is performed. It has been found that dynamic frame sizing with grouping yields highly efficient results. In this study, the proposed algorithm modifies the mechanism used for dynamic grouping as implemented in the EPC global class 1 generation 2 algorithm and results have been presented showing improvement in the number of slots utilization and iterations required to successfully detect different number of tags. General Terms Algorithms, RFID Anti collision

Research on Anti Collision Scheme of Main Pier of Chongqing Huanghuayuan Jialing River Bridge

On the basis of summing up the characteristics of water level and the channel where the bridge is located of Huanghuayuan Jialing River Bridge of Chongqing City, the risk of ship collision and structural characteristics were analyzed with the advanced risk analysis methods of AASHTO method and integral path methods with three probability parameters. The pier protection measures raised on this basis include that P1 pier is designed with anti collision pier and in the design of P2 pier, the floating anti collision box programs based on the highest water level and the anti collision pier program are raised and a comparatively studied. These conclusions provide some references for the anti collision design of bridges under similar environments.

Development of an Anti - Collision Model for Vehicles

The Anti Collision device is a detection device meant to be incorporated into cars for the purpose of safety. As opposed to the anti collision devices present in the market today, this system is not designed to control the vehicle. Instead, it serves as an alert in the face of imminent collision. The device is intended to find a way to implement a minimum spacing for cars in traffic in an affordable way. It would also achieve safety for the passengers of a moving car. The device is made up of an infrared transmitter and receiver. Also incorporated into it is an audio visual alarm to work in with the receiver and effectively alert the driver and/or the passengers. To achieve this design, 555 timers coupled both as astable and monostable circuits were used along with a 38 KHz Square Pulse generator. The device works by sending out streams of infrared radiation and when these rays are seen by the other equipped vehicle, both are meant to take the necessary precaution to avert a collision. The device would still sound an alarm even though it is not receiving infrared beams from the oncoming vehicle. This is due to reflection of its own infrared beams. At the end of the design and testing process, overall system was implemented with a constructed work, tested working and perfectly functional.

The Research of Clothing Identification Based on RFID Technology of IOT

Radio frequency identification (RFID) technology is a kind of the non-contact automatic identification technology. Clothing identification has many and complex characteristics, the existing clothing identification method have many defects. In order to adapt to the mass production demands of modern clothing enterprise, this paper puts forward the new clothing identification method based on RFID. And the anti collision algorithm is the key and prerequisite technology to identify targets correctly. Thus, based on the study of the existing anti collision algorithms, we discuss the problem of tags’ collision, analysis and contrast the existing algorithms. And then, the paper proposes the new anti collision algorithm. According to the improved algorithm, the labels are divided into several groups, and then identified correctly by the group identification algorithm. By the results of recognition result, we can estimate the number of the labels in the appointed area, and adjust the algorithm corresponding. The simulation results show that the algorithm is much better than the traditional anti ones.

Bit Shuffling Query Tree Algorithm for Secure Communication in RFID Network

RFID uses radio frequency waves to track and identify objects. RFID system consists of tags and readers. Passive RFID tags are more popular now days due to its simpler circuitry, lower weight and lower cost. Generally passive tags are attached with an object for unique identification. A tag contains information about the particular product, to which it is attached. RFID reader is used to interrogate the tag to get the identity of the product attached with. RFID has numerous applications such as inventory management, asset tracking, library management etc. One of the major problems with RFID system is that whenever a reader interrogates a tag, all the tags residing in the read zone of the reader responds to the reader, which results in a collision at the reader‟s side. Thus makes it impossible to read the tags in time. To minimize the problem of collision at the reader side several anti collision algorithms has been proposed, but none of the algorithm concerns about the security aspect. Security is another major problem of RFID system. RFID tag discloses its identity to any reader which interrogates the tag, so any illegitimate reader can obtain the information contained in the tag. Now a day‟s situation is much worse because not only unique identification number but also user information such as name, address, phone number and other relevant information‟s of consumer are stored in the tag. There are different manufacturers of tags who provide tags with 1kb memory, which is large enough to store such kind of consumer information without pointing to backend database. In such cases security concern is much more as eavesdropping may lead to disclose some personal data, which is a big threat for consumer. Implementing cryptographic algorithm is not a feasible solution for the RFID system, as this may result in complex circuitry, and which in turn may raise size and cost of the passive tags. Here in this paper we have combined both the problem of collision and security together to find a suitable solution which solves both the problems. Taking into consideration of simpler circuitry and lower price of passive tags, here we propose a solution which modifies existing anti collision protocol to make it secure so that any illegitimate reader cannot read the information contained in the tag thus protecting tags from malicious reading.