Topic
Guidance system
About: Guidance system is a research topic. Over the lifetime, 4282 publications have been published within this topic receiving 45964 citations.
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TL;DR: It is shown that for both lunar landing and atmosphere entry this guidance system, which uses a single nominal trajectory, and therefore requires minimum storage capacity, permits guidance to a selected landing site from a wide range of initial conditions.
Abstract: A guidance scheme based on linear perturbation theory has been investigated. An improved capability has been achieved by the proper choice of independent variable and by appropriate weighting of the guidance gains computed by linear theory. The capability of this scheme applied to the descent-to-hover phase of lunar landing is demonstrated for two different types of nominal trajectory: a constant-thrus t gravity turn maneuver, and a constant-thrust, constant-pitch-rate maneuver. To demonstrate the performance of this type of guidance scheme for atmosphere entry, it has been applied to the guidance of a vehicle entering the earth's atmosphere at parabolic velocity. Its capability is evaluated for entries from abort conditions, as well as for entries within the normal entry corridor, and effects of variations in life-drag ratio and atmospheric density are investigated. It is shown that for both lunar landing and atmosphere entry this guidance system, which uses a single nominal trajectory, and therefore requires minimum storage capacity, permits guidance to a selected landing site from a wide range of initial conditions.
13 citations
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11 Jun 1997
TL;DR: In this paper, an integrated guidance system for use in swath guidance applications combines the display of swath navigation information with swath guidance system information, and a processor receives information from an external positioning system such as a Global Positioning System receiver and generates course correction data derived from swath parameters selected by the user from a displayed menu of options using a control interface that is integrated with the display and processor or is located externally.
Abstract: An integrated guidance system for use in swath guidance applications combines the display of swath navigation information with swath guidance system information. A processor receives information from an external positioning system such as a Global Positioning System receiver and generates course correction data derived from swath parameters selected by the user from a displayed menu of options using a control interface that is integrated with the display and processor or is located externally. The swath navigation information is displayed graphically and numerically. The entire apparatus is compact and mountable within the operative view of the user as he operates the equipment to be guided, thereby reducing hazard and navigational error.
13 citations
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08 Dec 2008TL;DR: In this paper, a guidance system is configured to determine, with the aid of at least one current value of the aircraft and a ground-rolling trajectory, a yaw rate setpoint enabling the aircraft to follow the ground rolling trajectory by application of a Yaw rate command.
Abstract: A method and device automatically controls the driving of an aircraft along a ground path of an airport domain. A guidance system is configured to determine, with the aid of at least one current value of the aircraft and a ground rolling trajectory, a yaw rate setpoint enabling the aircraft to follow the ground rolling trajectory by application of a yaw rate command. The guidance system, with the aid of measured current values of parameters of the aircraft, the determined ground rolling trajectory and a speed profile that incorporates a variation of the longitudinal speed along the ground trajectory, a longitudinal speed setpoint that represents a longitudinal speed command to drive the aircraft along the ground trajectory, while complying with the speed profile. A piloting aid system calculates setpoints from the yaw rate command and applies the setpoints to control yaw motion of the aircraft.
13 citations
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TL;DR: In this article, the authors presented a detailed study of the two-dimensional (2D) differential geometric (DG) guidance problem, as well as its iterative solution and initial conditions.
Abstract: This paper presents a detailed study of the two-dimensional (2D) differential geometric (DG) guidance problem, as well as its iterative solution and initial conditions The DG guidance curvature command is transformed from an arc length system to the time domain using the classical DG theory Subsequently, an algorithm for commanded angle-of-attack is developed to formulate the DG guidance system, whose iterative solution is established based on Newton’s iterative algorithm Moreover, a flight control system is presented using the classical PID controller so as to form the DG guidance and control system Finally, a new necessary initial condition is deduced to guarantee the capture of a high-speed target Simulation results demonstrate that Newton’s iterative algorithm works well and accurately in DG guidance problems and the proposed DG guidance law exhibits similar performance to the proportional navigation guidance (PNG) law in the case of intercepting a non-maneuvering target However, the proposed method performs better than PNG in the case of intercepting a maneuvering target
13 citations
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01 Jan 1999
TL;DR: In this paper, a simple magnetic model for the study of the levitation and guidance forces produced by an electromagnet coupled with an iron rail is presented, which can better refer to the Japanese HSST than to the English BAMS.
Abstract: Electromagnetic levitated and guided systems are commonly used in the field of people transport vehicles, tool machines frictionless bearings and conveyor systems. In the case of low speed people transport vehicles, the electromagnetic levitation offers the advantage of a very silent motion and of a reduced maintenance of the rail. In the world there are actually two working low speed systems: the Japanese HSST ([1], [2]) and the English BAMS (Birmingham Airport MagLev System [3]). In both these magnetically levitated trains the guidance force needed to keep the vehicles on the track is obtained with the levitation electromagnets, thanks to particular shapes of the rails and to a clever placement of the electromagnets with respect to the rails ([4]). This paper shows a simple magnetic model for the study of the levitation and guidance forces produced by an electromagnet coupled with an iron rail. The rail and electromagnet shapes taken into consideration in this paper can better refer to the Japanese HSST than to the English BAMS. This paper will also deals with the study of the guidance force in the case of a vertical position control. The study shows that the guidance force can be stronger than in an open loop study.
13 citations