Measurement and Analysis of the Direct Train to Train Propagation Channel in the 70 cm UHF-Band

Abstract

Abstract. In this paper we present first analyses and results of a comprehensive measurement campaign investigating the propagation channel in case of direct (base station free) communication between railway vehicles. The measurements cover urban, suburban and rural environments along a multifaceted regional railway network in the south of Bavaria. Beside different operational conditions like front, rear, and flank approaches of trains, we investigated several topological scenarios on both, single and double track sections along the line. We will also discuss the observed characteristic changes in narrow band signal attenuation and Doppler spectra for passages through forests, hilly areas, stations and a tunnel.

A Measurement-Based Stochastic Model for High-Speed Railway Channels

“…We can see that the mean value of received signal of the two-ray model is reasonably close to the measurements, and the pattern compensation using (18) improves the prediction considerably. However, note that the reasonableness of the concluded two-ray model is affected by the accuracy of the pattern compensation, as previously discussed.…”

“…Extensions to frequencies other than this band could build on the work reported in [25] and [45], which quantify an increase in path loss with the carrier frequency and cover a frequency band from 150 MHz to 6 GHz. A more detailed channel model at 2.35 GHz can be found in [20] and [21], and a train-to-train channel model at 400 MHz can be found in [18] and [19]. 2) Antenna: Since we use a very particular directional BS antenna in the measurements, there would be some errors if our radio channel model is directly used for a system with different antenna patterns.…”

“…2. The total vertical antenna gain G v is therefore dependent on the distance and can be expressed as (18), shown at the bottom of the page, where G v,TX (·) and G v,RX (·) are the vertical gain of the TX and RX antennas, θ is the inclination angle of the BS antenna, and Δh is the height difference between the TX and RX antennas. Equation (3) is therefore rewritten as…”

“…In [17], a channel model for railways at 320 MHz is developed based on the field strength measurements in nine different cells in the rural eastern part of India. In [18] and [19], a train-to-train channel model at 400 MHz is developed for train collision avoidance. Some measurements have been conducted at a higher frequency, e.g., 2.4 GHz, which are relevant for offering broadband wireless access to passengers on HSRs.…”

Performance Analysis of ITS-G5 for Dynamic Train Coupling Application

“…As observed from measurement in VHF band [7], the T2T channel might be different to the C2C channel. Due to the lack of T2T channel characterization at 5.9 GHz we consider in this report, a simple pathloss model for radio propagation.…”