Global Navigation Satellite System (GNSS) Vector Correlator: Harnessing Satellite Direction Cosine Diversity for Robust Positioning

Abstract

The contractor investigated vector correlator as an alternative to the bank of parallel scalar correlators typically found in a conventional tracking receiver design. The vector correlator is different from vector tracking architectures by moving the correlation peak search into the physical domain: the three spatial dimensions and the additional time dimension. After the receivers navigation filter has produced an estimate of the next anticipated receiver state, differential offsets from this state are generated in all four dimensions and translated into pseudorange offsets via the receiver-satellite geometry. With external knowledge of the navigation data bit stream for each satellite, precise code and carrier replicas are generated for each differential offset, and a composite replica signal is used to correlate against the raw signal arriving from the receiver front-end. Results from this spatial correlation peak search are fed back to the navigation filter, closing the loop.

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Document Details

Document Type
Technical Report
Publication Date
May 07, 2019
Accession Number
AD1082220

Entities

People

  • Grace Xingxin Gao

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Aircrafts
  • Algorithms
  • Artificial Satellites
  • Cross Correlation
  • Data Sets
  • Estimators
  • Fixed Wing Aircraft
  • Global Navigation Satellite Systems
  • Global Positioning Systems
  • Government Procurement
  • Measurement
  • Navigation
  • Navigation Satellites
  • Position Finding
  • Spacecraft
  • Unmanned Aerial Systems

Readers

  • Image Processing and Computer Vision.
  • Positioning, Navigation, and Timing (PNT) Technology.

Technology Areas

  • Space
  • Space - Space Objects