A scan-phase multi-antenna diversity system is able to significantly improve reception performance of satellite digital audio radio systems (SDARS) in severe multipath propagation scenarios. The low hardware cost of such a system can only be achieved if a single level measurement circuitry is used for all antenna signals. In this paper the influences of switching between the antenna signals for level detection and the signal processing in the diversity system are studied for two different antenna diversity systems. A modification of the diversity hardware that avoids those influences is investigated. Measurements were performed to compare the modified and unmodified system in terms of audio availability.Test drives underneath dense foliage were conducted with a scan-phase antenna diversity system in combination with a diversity antenna set mounted on the dashboard of a car. This mounting position is of wide interest for example for convertibles, where the car roof is not available for the mounting of SDARS antennas. Measurement results show that the scan-phase antenna diversity system performs very well in such a disadvantageous antenna position. The diversity combination on the dashboard can compete with a roof-mounted patch antenna in the reception of geostationary satellite signals even with a closed roof.
Severalconcepts of antenna diversity for satellite digital audio radio systems (SDARS) are investigated. Acomparison is made regarding the improvement of reception quality.Special attention is paid to easy realisation in an automotive environment. Proof is shown that for critical reception scenarios for example underneath dense foliage or in multipath situations between high buildings an antenna diversity system yields asignificant reduction of the total duration of mutes. The concept of anew scan diversity and a combined scan/phase antenna diversity system are investigated, realised in hardwareand evaluated in real scenarios. Full diversityfunction is achieved with only minor or even without modifications of the receiver and no additional effort in mounting and required space for the antenna modules.Asinsingle arm reception systems only one tuner is used. There is only one antenna cable between antenna module and the receiver.
The reception of satellite digital audio radio services (SDARS) by vehicular receivers with a single antenna is usually only possible using a rooftop mounting position due to very strict specifications by the service provider. In cars where rooftop mounting is not an option alternative mounting positions have to be found. In most situations a single receiving antenna is not sufficient due to shadowing, attenuation, and strict size constraints leading to small ground planes in these positions.A single side mirror is used for mounting a diversity antenna set which is combined with a scan-phase diversity system in the work described in this paper. Signal recordings of such a scenario are analysed statistically and compared for test drive data of a shadowed and a non-shadowed antenna positioning due to the driving direction. Measurement results of the audio availability in real Rayleigh-fading scenarios show that the diversity system outperforms a single standard antenna on the rooftop of a car in this new configuration even though the car's shadowing of the antenna is considered.
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