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Instrumental and site errors

Instrumental and site errors

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Although this book is not primarily concerned with DF hardware, it is convenient at this point to summarise the physical sources of measurement errors arising from instrumental and site effects. Re-radiating objects in the vicinity of the receiving site are of particular interest here, because the rays from such objects add to the complexity of the wave-field to be resolved. The sources of error in DF can be broadly divided into four categories: (a) Instrumental errors, which can cause incorrect measurements in even the simplest situation, namely a single plane wavefront arriving at the DF array, (b) Site errors, i.e. distortions and deviations of the arriving wave-fronts caused by features in the neighbourhood of the receiving site such as re-radiating conductors, ground contours and gradients of ground conductivity, (c) Wave-interference errors, when the arrival of two or more rays produces swings in the indicated bearing. (d) Propagation errors, i.e. changes in ray direction produced by ionospheric tilts or magneto-ionic effects.

Inspec keywords: radio direction-finding; direction-of-arrival estimation; interference (wave); measurement errors; gradient methods

Other keywords: magneto-ionic effects; single plane wavefront; physical sources; ground conductivity; DF hardware; ionospheric tilts; site errors; reradiating conductors; DF array; incorrect measurements; measurement errors; wave-field; indicated bearing; wave-interference errors; propagation errors; site effects; receiving site; instrumental effects; gradients; ray direction; re-radiating objects; ground contours; instrumental errors; arriving wave-fronts

Subjects: Radionavigation and direction finding

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