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Image processing techniques for laser images

Image processing techniques for laser images

引用

Canadian conference on Electrical and Computer Engineering (CCECE)

作者： I. Saban S. Faibish RAFAEL Advanced Defense Systems Limited Haifa Israel Robotics and Automation Laboratory University of Toronto Toronto ONT Canada

This paper presents the signal processing method of laser images used for detection of small collinear obstacles in helicopter airborne applications. It is very difficult, if not almost impossible, for a regular passive imaging sensor based on CCD detectors to detect such small, remote objects. It was proved in the literature that the fusion of range and intensity data is needed for such a task. The paper presents a new and improved algorithm for real time image processing which enable detection of small tiny objects from sparse data, from a fast moving platform.

关键词： Image processing Cables Laser radar Object detection Signal processing algorithms Image edge detection Laser fusion Layout Signal processing Helicopters

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An improved, analog closed loop linearizer for W and Ka band FMCW

An improved, analog closed loop linearizer for W and Ka band...

引用

European conference on Microwave

作者： D Elad A Nahum D Adar S Zoref E Friedler A Madjar B Chiz RAFAEL Advanced Defense Systems Limited Haifa Israel

FMCW sensors are gaining more importance-in a wide variety of applications for measuring target range and relative velocity. In order to improve resolution of the sensor for measuring between two close, adjacent targets, one has to widen the bandwidth and to improve the linearity of the transmit chirp. In addition, improving the linearity increases the signal to noise ratio, and thus, the receiver sensitivity. In this paper we present a new analog, closed loop system, which pins the higher order VCO nonlinearity resulting in an overall linearity of 0.1%. The system is compact, cheap to implement, and free from spurious signals. Our theoretical analysis also identifies the important parameters which influence the linearity and sensitivity of the receiver.

关键词： Linearity Gain measurement Velocity measurement Signal resolution Bandwidth Chirp Signal to noise ratio Closed loop systems Pins Voltage-controlled oscillators

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A novel DDS based 94 GHz high linearity FMCW RE front end

A novel DDS based 94 GHz high linearity FMCW RE front end

引用

European conference on Microwave

作者： Asher Madjar Zvi Nativ Danny Adar Saul Zoref RAFAEL Advanced Defense Systems Limited Haifa Israel

FMCW millimeter wave sensors are very useful for both military and civilian applications, due to their low cost, simplicity and low transmitted power. In this paper we present a novel approach to the realization of linear FMCW chirp at a frequency of 94 GHz based on a DDS (Direct Digital Synthesizer). This is a much superior method compared to the common approach using a VCO with a linearization loop, the linearity of which is limited. Our approach enables realization of a relatively low cost, small size sensor with an extremely good linearity. We demonstrated an excellent range resolution of better than 0.5 meter at a range of 1 kilometer.

关键词： Linearity Chirp Clocks Assembly Costs Synthesizers Frequency control VHF circuits Millimeter wave technology Millimeter wave radar

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Design of a real-time co-operating system for multiprocessor workstations

Design of a real-time co-operating system for multiprocessor...

引用

Annual Hawaii International conference on System Sciences (HICSS)

作者： G. Krikor M.T. Raza D.B. Stewart Department of Elecrrical Engineering Institute for Advanced Computer Studies Institute for Systems Research University of Maryland College Park MD USA

We have designed a real-time co-operating system (RTCOS) for simultaneously supporting real-time and non-real-time activities on a workstation with two or more processors. The RTCOS is the software equivalent of a coprocessor, with a software architecture analogous to the hardware architecture that has been used in many workstations and personal computers. We discuss our first software prototype of the RTCOS, which co-exists with Solaris 2.4 on a four-processor Sun SPARCstation 20. We summarize the feasibility of our approach through an experimental characterization of Solaris 2.4. We address the technical issues involved and present the details of our design. The RTCOS is targeted towards real-time applications in the sensor-based control, process control, signal processing, multimedia, and manufacturing domains.

关键词： Real time systems Workstations Process control Coprocessors Software architecture Hardware Computer architecture Microcomputers Software prototyping Sun

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Rapid prototyping of chassis control systems

Rapid prototyping of chassis control systems

引用

IEEE International Symposium on Computer Aided Control System Design (CACSD)

作者： M.R. DePoyster J.F. Hoying K.N. Majeed Delphi Chassis Systems Dayton OH USA

The process of developing and testing chassis systems control algorithms has improved significantly from earlier methods. Previously, ideas were implemented in assembly language targeted for a fixed-point processor for real-time implementation in a vehicle controller. In this paper an example is presented that illustrates the use of rapid prototyping tools in the development of chassis control algorithms. The development of a new brake algorithm using a Simulink block diagram model is described. The multiprocessor development system employs a microprocessor-based brake controller acting as the master with a DSP-based dSPACE Autobox serving as a slave processor. The base braking algorithm resides in the microprocessor-based controller allowing utilization of all of the original brake system inputs and outputs. The advanced braking algorithm resides in the dSPACE Autobox. sensor inputs are read by the brake controller and passed to the Autobox over a high speed optical CAN bus. The Autobox performs the necessary computations and sends the results back to the brake controller which adjusts the outputs accordingly. The development control system architecture is described in detail in the paper. The advantages of rapid prototyping over previous methods are also outlined with estimated savings in development time given.

关键词： Prototypes Control systems Optical sensors System testing Assembly Vehicles Master-slave Optical control High speed optical techniques Computer architecture

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Low-cost, composite sensor array combining ultrasonic and infrared proximity sensors

Low-cost, composite sensor array combining ultrasonic and in...

引用

Proceedings of the 1995 IEEE/RSJ International conference on Intelligent Robots and systems. Part 3 (of 3)

作者： Sabatini, Angelo M. Genovese, Vincenzo Guglielmelli, Eugenio Mantuano, Anselmo Ratti, Giovannino Dario, Paolo Advanced Robotics Technology & Systems Pisa Italy

In this paper we describe our approach to the design of proximity sensor arrays. Each sensing element of the proximity sensor array is a composite sensor, i.e. a sensor which is composed of an in-air ultrasonic rangefinder and an infrared detector. This sensor arrangement is capable, in principle, to achieve a perception of the explored objects that is not necessarily limited to their geometrical properties (size, shape and location relative to the sensor);possibly, the perception can be extended to other relevant features. In this paper, we show that, in principle, a sort of perception of the surface reflectance (the color) is achievable. The concept of the proposed sensor array spans a wide range of potential applications in flexible industrial automation, service robotics and autonomous mobility. The system herein described, in particular, is intended for providing an advanced wheelchair with the navigational capabilities required for improving the driving skills of disabled users.

关键词： sensors

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System overview and applications of a panoramic imaging perimeter sensor

System overview and applications of a panoramic imaging peri...

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Proceedings of the 29th Annual 1995 International Carnahan conference on Security Technology

作者： Pritchard, Daniel A. Sandia Natl Lab Albuquerque United States

This paper presents an overview of the design and potential applications of a 360-degree scanning, multi-spectral intrusion detection sensor. This moderate-resolution, true panoramic imaging sensor is intended for exterior use at ranges from 50 to 1500 meters. This advanced Exterior sensor (AES) simultaneously uses three sensing technologies (infrared, visible, and radar) along with advanced data processing methods to provide low false-alarm intrusion detection, tracking, and immediate visual assessment. The images from the infrared and visible detector sets and the radar range data are updated as the sensors rotate once per second. The radar provides range data with one-meter resolution. This sensor has been designed for easy use and rapid deployment to cover wide areas beyond or in place of typical perimeters, and tactical applications around fixed or temporary high-value assets. AES prototypes are in development. applications discussed in this paper include replacements, augmentations, or new installations at fixed sites where topological features, atmospheric conditions, environmental restrictions, ecological regulations, and archaeological features limit the use of conventional security components and systems.

关键词： Image sensors

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Smart-pixel array processors based on optimal cellular neural networks for space sensor applications

Smart-pixel array processors based on optimal cellular neura...

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Proceedings of the 1995 IEEE International conference on Computer Design: VLSI in Computers & Processors

作者： Fang, Wai-Chi Sheu, Bing J. Venus, Holger Sandau, Rainer California Inst of Technology Pasadena United States

A smart-pixel cellular neural networks with hardware annealing capability, digitally programmable synaptic weights, and multisensor parallel interface has been under development for advanced space sensor applications. The smart-pixel CNN architecture is a programmable multi-dimensional array of optoelectronic neurons which are locally connected with their local neurons and associated active-pixel sensors. Integration of the neuroprocessor in each processor node of a scalable multiprocessor system offers orders-of-magnitude computing performance enhancements for on-board real-time intelligent multisensor processing and control tasks of advanced small satellites. The smart-pixel CNN operation theory, architecture, design and implementation, and system applications are investigated in details. The VLSI implementation feasibility was illustrated by a prototype smart-pixel 5×5-neuroprocessor array chip of active dimensions 1380 μm × 746 μm in a 2-μm CMOS technology.

关键词： Parallel processing systems

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DiveTracker: Characteristics and applications of an advanced dive mission control system

DiveTracker: Characteristics and applications of an advanced...

引用

OCEANS 95 MTS/IEEE conference on Challenges of Our Changing Global Environment

作者： Flagg, M DESERT STAR SYST MOSS LANDINGCA 95039

ISBN: (纸本)0933957149

DiveTracker, a highly versatile dive mission control system, is presented. DiveTracker offers an integrated solution for tasks ranging from diver, ROV, and AUV tracking and navigation to communication, telemetry, observation recording, sensor data acquisition, precision surveying and underwater computing tasks. It is a wireless system, relying on sonar for navigation and communication functions. The system is fully software programmable and is easily adapted to suit specialized requirements. This paper explores the DiveTracker architecture and characteristics. Performance parameters are reviewed and current installations and applications are explored.

关键词： Control systems

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Real-time digital adaptive tracking controller for a DC motor

Real-time digital adaptive tracking controller for a DC moto...

引用

conference Record of the 1995 IEEE Industry applications 30th IAS Annual Meeting. Part 3 (of 3)

作者： Hwang, Santai Purdue Univ Fort Wayne United States

The objective of this design is to implement an accurate and cost effective adaptive tracking controller for a DC motor using an 80C196kr microcontroller system. The on-chip embedded functions, optical quadrature encoder and a Pulse Width Modulated (PWM) waveform generator, are used to measure motor positions and generate DC voltages to drive a DC motor respectively. A homing routine that incorporates a photo electric sensor is used to position the motor at a reference point. Users communicate with the system through a 4×4 matrix keypad and 20×2 LCD display or through a PC. The experimental results have shown the validity of this simple microcontroller-based digital control system. This system is performed on a real-time basis, and the control law can be easily replaced by any advanced control laws without changing the hardware setup.

关键词： Digital control systems

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