Loran-C receiver performance in the presence of carrier-wave interference

Article Abstract:

Carrier Wave Interference (CWI) has been shown to be a serious problem which affects the operation of all Loran-C receivers in Europe, and aviation and land mobile receivers in the US and Canada. The designers of Loran-C systems for use in Europe have been obliged to pay considerable attention to CWI in predicting their coverage. This paper contains a unified analysis of the effects of the phase-coding of the signals and integration in receivers in CWI, and it provides a quantitative assessment of receiver performance under CWI conditions. The analysis includes synchronous, near-synchronous and asynchronous interference. It shows that synchronous and near-synchronous CWI, in contrast to asynchronous, are attenuated by phase-decoding and integration within periods of 2GRI and that longer periods of integration do not improve performance. Front-end filtering is incorporated into the analysis by considering not only the attenuation of interference which it provides, but also the delay and distortion it causes to Loran-C signals. Both the phase-tracking and the cycle-selection functions of receivers are examined and their relative sensitivities to interference are compared. The results of the analysis, which have also been confirmed by computer simulation, are presented in a form that will be of direct use to the designers of both receivers and systems. (Reprinted by permission of the publisher.)

Bandwidth, Scientific Research, Signal Processing, Bandwidth Technology

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An advanced LORAN-C receiver structure

Article Abstract:

In this paper, a new LORAN-C receiver structure is proposed that is capable of reducing the influence of multipath and interference. In addition, it has the advantage of fast acquisition, since all the estimation processes are performed simultaneously instead of sequentially. A brief explanation is given of the theory behind the new structure, followed by a discussion of how to implement it. Finally, some simulation results demonstrate the considerable improvements that can be obtained. (Reprinted by permission of the publisher.)

Product introduction, Digital signal processors, New Technique, Signal Propagation, Digital Signal Processor

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