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Summary. This paper presents a new method of cooperative localization for multiple robots utilizing correlation between GPS errors of common mode in shared workspace. Assuming that GPS data of individual robot are correlated strongly as the distance between robots are close, we utilize the differential position data between the robots to refine robot's position data. Under artificial environment for simulation with imposed model error to robot motion and GPS sensor data error, it is confirmed that the proposed method provides improved localization accuracy [9]. In addition, we present a practical solution to accumulated position error in traveling long distance. IntroductionMobile robots require capability to estimate their position in order to navi gate autonomously in their work space. Consequently, localization by sen sor-based method has been researched as one of the most essential prob lems in mobile robotics. In previous researches, a number of works on lo calization of single robot have been reported [1,2]. However recently, many robotic applications require that robots work in collaboration in common workspace to perform a task. In such tasks as multiple robots op erate in close, we need more precise absolute localization or relative local ization of multiple robots in order to avoid collisions with each other. The multiple robot system, in comparison with the single robot system, has the advantages of collecting and integrating multiple sensor data from dif ferent robots. Accordingly, the system can obtain better localization per formance and increase the robustness of the localization accuracy for each

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In this paper, we have proposed a methodology which can test and evaluate on system level in development phase of command guided missile system. Test and evaluation play a significant role in the development of weapon system, providing the means for determining to what extent the weapon system satisfies its requirements, whether it functions normally in the operational environment. In case of command guided missile having seeker, the missile communications link provides data to allow the missile to fly an efficient trajectory toward target. Therefore, it is very important to test and evaluate for data link between missile and radar on whole system aspect. we introduce the concept and devices for system level test and evaluation of command guided missile system.

In this paper we present the mechanical/electrical design of half-sized outdoor patrol robot CALEB I. The robots are designed to be operated by both remote control mode and autonomous mode. To patrol around buildings efficiently and safely, we implemented navigation algorithms based on GPS and odometer, and obstacle avoidance and traversal as well as posture stabilization. The robot offers autonomous surveillance for outdoor environments, which is proved by a set of experiments in outdoor environment.