面向复杂环境的自适应GNSS接收机设计

Design of Adaptive GNSS Receiver for Complex Environment

无处不在的导航要求在所有时间、所有环境和所有方式下及时、不间断、准确地估计接收机的位置,并且高度依赖卫星可用性、几何结构和准确的定位估计。然而,在高度动态的环境中,由于阻塞、衰落和多径等原因,全球导航卫星系统(Global Navigation Satellite System,GNSS)的可用性、连续性及准确性会受到严重影响。这将导致定位信息不准确、不可靠甚至不可用。为此,本文介绍GNSS系统基本情况和GNSS接收机性能评估方法,基于环境检测和特征描述,提出一种面向复杂环境的自适应GNSS接收机设计方案。该接收机方案能够满足高动态多径或非视距环境的应用要求。

Ubiquitous navigation requires timely, uninterrupted and accurate estimation of the position of the receiver at all times,in all environments and in all modes of transportation, and is highly dependent on satellite availability, geometry and accurate positioning estimation. However, in a highly dynamic environment, the availability, continuity and accuracy of Global Navigation Satellite System(GNSS) will be seriously affected due to congestion, fading and multipath. This leads to inaccurate, unreliable and even unavailable positioning information. This paper first introduces the basic situation of GNSS system and the performance evaluation method of GNSS receiver, and then proposes an adaptive GNSS receiver design scheme for complex environment based on environment detection and feature description. The receiver scheme can meet the application requirements of high dynamic multipath or non line of sight environment.