Spectral analysis of timing jitter effects on the cyclostationary PPM format

Elmirghani, Jaafar M. H.; Cryan, R.A.; Clayton, F.M.

doi:10.1016/0165-1684(95)00005-x

Cited by 8 publications

(1 citation statement)

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“…[2], which is suitable for low-cost UAVs remotely controlled from land. It is well known that clock recovery timing jitter impairs PPM format [3]. Besides, in a typical situation the UAV control signal receiver operates in the presence of several undesired signals that may jam desired control signal.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of direct sequence spread spectrum scheme for an unmanned aerial vehicle PPM control signal

Todorović

2010

FACTA U EE

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Binary pulse-position modulated (PPM) control signal is widely used in remotely controlled unmanned aerial vehicles. It consists of data frames, which contain a synchronizing pulse followed by a number of shorter pulses equal to the number of channels N. In this paper we present analysis and optimization of direct sequence spread spectrum (DS-SS) scheme for PPM control signal protection. That scheme uses (N+1) pseudonoise (PN) sequences: one of them (PN0) is assigned to the synchronizing pulse while the each of the remaining N sequences (PN1,PN2, . . . ,PNN) corresponds to the appropriate channel. At the receiving side, the set of (N+1) passive correlators is used to detect respective PN sequences and to reconstruct data. Onelevel and two-level detection are considered. Threshold settings optimization is based on the Neyman-Pearson procedure. As an additional performance measure we introduce probability of corruptive false alarms. Numerical results are presented.

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Section: Introductionmentioning

confidence: 99%