共查询到19条相似文献,搜索用时 171 毫秒
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SINS/CNS/GNSS组合导航系统具有全自主、抗干扰能力强、高精度等优点,对导航计算机性能要求高。从组合导航系统对导航计算机的需求出发,本文基于DSP和FPGA设计了高精度、高可靠性、小型化、低成本、低功耗的导航计算机系统。本文首先给出了导航计算机的原理结构框图,并详细介绍了主要功能单元;其次介绍了程序设计的基本思路;最后根据GJB/Z299C-2006提供的数据和方法,计算了导航计算机的可靠性指标MTBF。实际应用结果表明,该导航计算机的处理速度、处理精度、可靠性、成本、体积、功耗等指标均达到组合导航系统要求。 相似文献
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共轴式无人驾驶直升机导航系统的设计 总被引:1,自引:0,他引:1
分析了某型号共轴式无人驾驶直升机的导航系统的设计原理和硬软件实现。导航系统利用PC104系统作为导航计算机,分别利用GPS信号和捷联惯导系统进行组合导航,能够满足无人机的导航要求,而且体积小,重量轻、可靠性高。在实际飞行中,导航系统成功的完成了导航任务,结果令人满意的。 相似文献
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基于 SINS/CNS/GNSS 组合导航计算机,提出了一种容错设计的组合导航计算机。 首先,介绍了组合导航计算机容错设计的主要目的和设计思路,提出了容错组合导航计算机结构原理;其次,基于硬件元件功耗不同,设计了不同的硬件容错方法;然后,在硬件容错方法基础上设计了 N 版本程序方法和恢复块方法,实现了软件容错;最后,从导航源利用情况和组合导航计算机可用性两个方面对设计的容错导航计算机和传统导航计算机进行比较。实际应用结果表明,相对于传统导航计算机,设计的容错组合导航计算机可以有效检测隔离故障,提高组合导航计算机的可靠性和可用性。 相似文献
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前文已对所需导航性能概念-按导航精度划分类型所建立的分级判据进行了叙述。本文将围绕空域规划、航路设计所需导性能的完善性和可用性进行叙述。最后举例波音747/737飞机上如何通过组合导航和FMC软件来实现,并举列IATA建议我的在太平洋海域航路实现RNP的计划。 相似文献
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基于DSP和单片机的双CPU导航计算机设计 总被引:6,自引:0,他引:6
结合现代导航技术发展的特点,以DSP作为算法实现核心处理器,以单片机作为数据采集处理器,设计了双CPU结构的导航计算机.文中给出系统整体组成结构的同时,还论述了软、硬件设计中的关键技术.实验证明,强大的数据采集及处理能力,使其可作为纯捷联惯导或是INS/GPS组合导航的实现平台.同时体积的减小、功耗和成本的大大降低,拓展了导航技术的应用领域,对导航系统的微型化具有重要意义。 相似文献
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为适应组合导航计算机系统的微型化、高性能度的要求,拓宽导航计算机的应用领域,文中设计了一种基于PC104和可编程逻辑阵列器件协同合作的导航计算机系统。系统主要包括数据采集模块和数据解算模块两部分,给出了PC104与FPGA的片内接收模块进行通信的设计方案。为提高FPGA与工控机之间的数据传输速度,设计了通过共享双端口RAM的方式,实现了工控机与FPGA之间的高速数据交换。从硬件结构和软件设计方面说明了系统各模块的功能以及模块间的通信。 相似文献
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为了采集到高精度、低差错率的导航参数,采用了高精度的A/D转换器件AD677和TI的TMS320F2812来实现对微机械陀螺、加速度计和温度传感器采样过程的控制,同时利用TMS320F2812的eCAN模块来实现与主控计算机的数据通讯和地面测试。首先介绍了导航计算机信息处理系统的总体设计,然后分析了CAN报文帧格式、整个系统软件设计的流程图、AD677采集软件的设计、CAN报文发送程序设计以及CAN总线通讯测试界面的设计。 相似文献
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A path tracking control system developed for autonomous mobile robots driven by wheels is described. In conventional approaches, the path is usually planned by smooth curves with curvature-continuity and a path tracking controller is independently designed to compensate the path error occurring in the navigation. However, smooth path planning is difficult to execute on-line due to the computational burden. In addition, the conventional path tracking algorithm often causes unpredictable tracking motion when large path error occurs. In previous work, the present authors presented a bang-bang path tracking algorithm by which smooth and stable tracking motion could be obtained even for the path given by simple combination of straight lines or circles and its effectiveness was proven via preliminary simulation studies. However, there still remained the problem that the design parameter called landing coefficient could not be optimally chosen and performance verification through real system application was not accomplished. In this study, we improve the algorithm which can determine the design parameters analytically and verify its performance by implementing the algorithm in an actual mobile robot control system designed using a personal computer. To investigate the performance of the control system, a series of path tracking experiments was conducted for a two-wheel driven robot developed in the laboratory. 相似文献
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一种北斗联合低轨星座的导航增强方法研究 总被引:1,自引:0,他引:1
单纯依靠北斗导航系统提供定位导航授时服务,存在卫星信号落地功率低、易受遮蔽和阻断的不足。针对此问题,研究了一种北斗联合低轨星座实现导航增强的系统架构;提出了一种新的适应严重遮蔽或干扰条件下,基于到达时间(TOA)和到达频率(FOA)联合观测的定位解算算法;对高中低轨混合星座条件下的覆盖特性和精度衰减因子进行了仿真分析。分析结果表明,用户可见星数平均增加了64.2%,位置精度衰减因子(PDOP)平均改善了28.7%。研究结果可为下一代北斗的论证设计与研制建设提供参考借鉴。 相似文献
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In the design of a BeiDou navigation satellite system(BDS) receiver, the carrier loop is largely influenced by the loop filter, and the selection of loop filter parameters is crucial to the performance of the carrier loop. In this paper, by analyzing the relationship between the parameters of the loop filter transfer function of the BDS receiver's fourth-order carrier loop system and the time-domain index of the system, the loop filter transfer function parameters of the fourth-order system are obtained when the dynamic performance is best optimized under the condition that the maximum steady-state error is limited. The relationship between the phase margin, magnitude margin of the system and the parameters of the system transfer function is obtained through simulation experiment and theoretical derivation. The simultaneous equations of deriving the loop system transfer function parameters are given under the following conditions:the optimal phase margin and magnitude margin of the system are settled. These research results have important reference significance for the design of a high-performance BDS receiver. 相似文献
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Land-vehicle navigation using GPS 总被引:14,自引:0,他引:14
Abbott E. Powell D. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1999,87(1):145-162
The Global Positioning System (GPS) has made navigation systems practical for a number of land-vehicle navigation applications. Today, GPS-based navigation systems can be found in motor vehicles, farming and mining equipment, and a variety of other land-based vehicles (e.g., golf carts and mobile robots). Each of these applications is discussed and the reader is introduced to some of the issues involved with each one. One particular technical aspect of navigation for land vehicles is discussed. Specifically, the research discussed in this paper presents a quantitative examination of the impact that individual navigation sensors have on the perfomance of a land-vehicle navigation system. A range of navigation sensor performance levels and their influence on vehicle positioning accuracy are examined. Results show that, for a typical navigation system, positioning error is dominated by the accuracy of the position fixes provided by the GPS receiver when GPS position fixes are available and by the rate gyro's bias drift when GPS position fixes are not available. Furthermore, results show that the accuracy of the GPS position fixes has a significant impact on the relative contributions that each dead-reckoning navigation sensor error makes. The implications of these results for navigation system design and sensor design are discussed 相似文献