Aeronautical channel modeling at VHF-band

Hoeher, Peter Adam; Haas, E.

doi:10.1109/vetecf.1999.797280

Cited by 40 publications

(22 citation statements)

References 8 publications

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“…Air-to-ground measurements are expensive and logistically challenging, hence models have been relied on extensively, for example [5]- [7]; see [8] for a review and further references. Measurements have been performed from tall buildings to estimate air-to-ground pathloss and other characteristics [9].…”

Section: A Related Workmentioning

confidence: 99%

Measurement and Characterization of Low-Altitude Air-to-Ground MIMO Channels

Willink

Squires

Colman

et al. 2016

IEEE Trans. Veh. Technol.

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To support the development of high-capacity airto-ground links for range extension, measurements of the lowaltitude air-to-ground channel were made at 915 MHz. Two transmit antennas were mounted on a UAV, which was flown in loops at an altitude of approximately 200 m above ground level. The received signals were recorded at each of eight antenna elements mounted on a van, at locations outside and inside the flight loop. Analysis of the measurements shows that there are regions where the spatial diversity is significant, despite the sparse multipath environment, indicating spatial decorrelation at both the ground and air terminals. The variations in spatial correlation across the receiver array indicate the presence of nonplanar wavefronts produced by the signals' interaction with objects in the array near-field, in particular, the measurement vehicle. A similar effect is probable at the UAV, and it is expected that more significant near-field effects would arise on a more conventional air platform. These support significant reductions in outage probability at both receiver locations: with appropriate signalling strategies, an airborne platform could provide a viable relay or broadcast node for high capacity communications using MIMO.

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Section: A Related Workmentioning

confidence: 99%

Measurement and Characterization of Low-Altitude Air-to-Ground MIMO Channels

Willink

Squires

Colman

et al. 2016

IEEE Trans. Veh. Technol.

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“…r RF Channel: direct link or VHF ATC channel [28]; thanks to the envelope-detector and low-pass filter in the RF section of the receiver, Doppler shift has no effect, and the fading effect is reduced, giving results which we found similar to a simple AWGN channel. r The five parameters of the V/U segmentation algorithm (Section 3.2) have been varied in order to achieve the best performance (optimization procedure).…”

Section: Work Hypotheses and Simplifying Assumptionsmentioning

confidence: 59%

A secure radio communication system based on an efficient speech watermarking approach

Fantacci

Menci

Micciullo

et al. 2008

Security Comm Networks

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This paper deals with an efficient secure communication system based on a speech watermarking approach. The main goal of the system is to efficiently support air traffic control (ATC) communications by improving safety and security of the existing ATC equipment embedding digital side information into speech signals in order to allow an automatic identification of the talker. An implementation based on the use of the well known LPC (linear predictive coding) principle is discussed. The LPC residual is split up into voiced and unvoiced segments; while the voiced segments cross the system unmodified, the watermarking data are embedded into the unvoiced segments, spectrally similar to a white noise. The watermark signal is decoded by a very similar scheme. We provide also a statistical analysis on the unvoiced parts of the ATC communications that demonstrates the system feasibility. In addition to this, an optimization of the entire system has been also performed to increase performance. The obtained results highlight that the watermark data are nearly imperceptible and provide a data channel with rate from 2000 to 5000 kbits/s, with high robustness to channel noise; the system requires only modular, low-cost and easy-to-install encoders and decoders, maintaining compatibility with legacy RF DSB-AM transceivers. Moreover, it is well suited both for the actual 25 kHz RF channels and for the new 8.33 kHz European RF channels.of network security attacks [1]. In particular, after the 11 September terroristic attack, these requirements have become of paramount importance for ATC (air traffic control) communications.Almost all tactical ATC communications are handled using DSB-AM radio systems. DSB-AM voice channels are allocated sector-wise and their SECURE RADIO COMMUNICATIONS BASED ON SPEECH WATERMARKING 307 ‡ Mean opinion score is an evaluation scale commonly adopted for the subjective measurement of voice quality [23,24]; the scale goes from 1 (bad quality) to 5 (best quality), and is evaluated through extensive campaigns involving a sufficiently high number of listeners, each one giving his or her opinion on the audio quality. SECURE RADIO COMMUNICATIONS BASED ON SPEECH WATERMARKING 311 Segmentation ResultsAfter completing the optimal system parameters setting and assumed a Voicing Threshold value of 0.35 we investigated the influence of the ATC channel on the system performance. The segmentation is assumed performed differently at the embedder and the decoder

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“…The channel model in [1] follows this approach and proposes different parameters for parking, taxiing and take-off/landing scenarios. In the tapped delay line model proposed in [2,3], the changes in the multipath characteristics are considered by modeling the tap persistence behavior.…”

Section: Introductionmentioning

confidence: 99%

Scatterer based airport surface channel model

Gligorevic

Jost

Walter

2009

2009 IEEE/AIAA 28th Digital Avionics Systems Conference

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Based on measurements at Munich airport and the observation of the spreading function, this paper analyzes different types of scatterers which occur in the spreading function and their temporal behavior. The scatterer analysis reveals the non-stationary character of the airport surface channel and is useful for stochastic modeling. The proposed geometrybased, stochastic channel modeling approach may be realized by either randomly placing reflecting objects based on the scatterer analysis or utilizing an appointed airport environment. The proposed channel model yields a spreading function characteristic for the apron area.

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Aeronautical channel modeling at VHF-band

Cited by 40 publications

References 8 publications

Measurement and Characterization of Low-Altitude Air-to-Ground MIMO Channels

Measurement and Characterization of Low-Altitude Air-to-Ground MIMO Channels

A secure radio communication system based on an efficient speech watermarking approach

Scatterer based airport surface channel model

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