Abstract
Abstract. When statistical inversion of a lag profile is used to determine an incoherent scatter target, the posterior variance of the estimated target can be used to determine how well a set of transmission codes perform. In this work we present an incoherent scatter radar transmission code optimization search method suitable for different modulation types, including binary phase, polyphase and amplitude modulation. We found that the combination of amplitude and phase modulation provides better performance than traditional binary phase coding, in some cases giving better accuracy than alternating codes.
Highlights
Incoherent scatter radar lag profile measurements can be deconvolved using statistical inversion with arbitrary range and time resolution as shown by Virtanen et al (2008b)
In this work we present an incoherent scatter radar transmission code optimization search method suitable for different modulation types, including binary phase, polyphase and amplitude modulation
We found that the combination of amplitude and phase modulation provides better performance than traditional binary phase coding, in some cases giving better accuracy than alternating codes
Summary
Incoherent scatter radar lag profile measurements can be deconvolved using statistical inversion with arbitrary range and time resolution as shown by Virtanen et al (2008b). The radar transmission envelope plays an important part in determining the variance of the target autocorrelation function estimates. As the inversion is a statistical problem with a linear model, determining an optimal radar transmission waveform, i.e. one that minimizes variance, is a typical problem of optimal statistical experiment design (Pukelsheim, 1993). We found using an optimization algorithm that a combination of amplitude and arbitrary phase modulation can achieve very close to optimum coding (in most cases 1% worse than optimal in terms of normalized variance). In this study we apply a similar optimization method to find transmission codes that minimize the variance of incoherent target autocorrelation function estimates. The ranges will be defined as round-trip time for the sake of simplicity
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