BS EN 13848-2:2006

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Track recording vehicle
  5.1 General description
  5.2 Environmental conditions
      5.2.1 Introduction
      5.2.2 Climatic conditions
      5.2.3 Operating conditions
  5.3 Track features input
  5.4 Data localisation
  5.5 Measuring system/device
      5.5.1 General
      5.5.2 Sensors
      5.5.3 Signal transmission
      5.5.4 Signal processing
  5.6 Data processing
      5.6.1 General requirements
      5.6.2 Parameter generation
      5.6.3 Parameter analysis
      5.6.4 Preparation for output interfaces
  5.7 Data output
      5.7.1 Visualisation
      5.7.2 Output of analysis results
      5.7.3 Data transmission
  5.8 Data storage
6 Testing of track geometry recording system
  6.1 Introduction
  6.2 Compliance with EN 13848-1
  6.3 Calibration
  6.4 Validation by field tests
      6.4.1 Overview
      6.4.2 Test conditions
      6.4.3 Comparison between different runs
      6.4.4 Cross check
      6.4.5 Field tests
Annex A (informative) Transfer and coherence functions
  A.1 General description
      A.1.1 Transfer function
      A.1.2 Coherence function
  A.2 Practical calculation
  A.3 Applications within this standard
      A.3.1 Comparison between two runs
      A.3.2 Cross check
Annex B (informative) Principles of measurement
  B.1 General descript
  B.2 Longitudinal level and alignment
      B.2.1 Chord measuring system
      B.2.2 Inertial measuring system
  B.3 Gauge
  B.4 Cant
  B.5 Twist
Annex C (normative) Description of field tests: values
                    to be respected
  C.1 General
  C.2 Repeatability
      C.2.1 Statistical analysis of parameter data
      C.2.2 Statistical analysis of standard deviations
      C.2.3 Frequency analysis
  C.3 Reproducibility
      C.3.1 Statistical analysis of parameter data
      C.3.2 Statistical analysis of standard deviations
      C.3.3 Frequency analysis
  C.4 Cross check
      C.4.1 General
      C.4.2 Transfer function
      C.4.3 Coherence function
Bibliography

Specifies the minimum requirements for measuring principles and systems in order to produce comparable results.

This European Standard specifies the minimum requirements for measuring principles and systems in order to produce comparable results. It applies to all measuring equipment fitted on dedicated recording vehicles, or on vehicles specifically modified for the same purpose, after the coming into force of the standard. It also defines the requirements of measurement.