Interference Analysis for Compatibility between 5G system and Aeronautical Radio Altimeter

Son, Ho-Kyung; Chong, Young‐Jun

doi:10.1109/ictc49870.2020.9289432

Cited by 9 publications

(5 citation statements)

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“…In total, the number N can be changed up to eighty times in the Δ𝐻 range. In the height range towards the lower height 𝐻 − Δ𝐻, the number For each radio altimeter, it is possible, based on the parameter-the total frequency lift ∆ f , to calculate its methodological error ∆H according to the mathematical relation (7). In the case of the measured radio altimeter, this is the mentioned value of 0.75 m.…”

Section: Analysis Of Results Of Measurement Of Methodological Errormentioning

confidence: 99%

“…The 5G network is open for licensing from December 2020. This issue is currently the subject of research and more studies, and no specific conclusions have yet been drawn, only recommendations [ 6 , 7 ]. However, the results presented in the report [ 3 ] reveal a major risk that 5G telecommunications systems will cause interference to onboard radar altimeters on all types of civil aircraft (commercial airplanes, business jets, regional aircraft, and general aviation airplanes and both transport and general aviation helicopters.…”

Section: Introductionmentioning

confidence: 99%

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The Method of Evaluation of Radio Altimeter Methodological Error in Laboratory Environment

Kurdel

Češkovič

Gecejová

et al. 2022

Sensors

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The presented article is focused on the evaluation of aviation radio altimeter (ALT) methodological error in order to increase air traffic safety. It briefly explains the background of methodological error at the theoretical level and offers practical conclusions to understand the issue. A radio altimeter provides information on an aircraft or helicopter’s instantaneous (radar) altitude or UAV to the pilot and another assistance system, such as an autopilot or an anticollision system. The height measurement of the most common used ALTs is realized with an accuracy of from ±0.30 m to ±0.75 m. This error rate corresponds to and is caused by the radio altimeter’s methodological error (ΔH). The ALT operating parameters are defined by carrier frequency, modulation frequency, and frequency lift. The methodological error of ALT can be obtained in three ways—calculated on a theoretical level, simulated in a suitable simulation environment, or evaluated in laboratory conditions. The ambiguity of ALT methodological error measurement causes bias in its presentation. This often leads to an incorrect determination of measurement inaccuracy (too optimistic statement of error value). The article’s primary goal is to present a new method for determining the value of the methodological error and its effect on the resulting error of measurement of the radio altitude (radar altitude). It presents a new experimental laboratory method for measuring ΔH and the resulting accuracy of height measurement with a radio altimeter. Thanks to this method, it can be verified that the information obtained by measuring the height above the ground corresponds to the standard specified by the manufacturer.

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Section: Analysis Of Results Of Measurement Of Methodological Errormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Method of Evaluation of Radio Altimeter Methodological Error in Laboratory Environment

Kurdel

Češkovič

Gecejová

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…Rather than using a set or pre-defined locations for these stations, the approach incorporates an element of randomness, positioning the 5G BSs arbitrarily within the operational coverage area of the radar altimeter. The coverage area of a radar altimeter, shown in Figure 4, is visualized as a circular region, with its area reducing as the aircraft altitude decreases (Son & Chong, 2020). The cumulative probability of the interference power received at the radar altimeter is then calculated for various altitudes and 5G BSs emission levels.…”

Section: Interference Analysis and Methodologymentioning

confidence: 99%

Airborne Safety in the Age of 5g: Assessing the Potential Interference Between C-Band and Aeronautical Radar Altimeter

Elsayem,

Elghamrawy,

Massoud

et al. 2023

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. The recent deployment of 5G technology in the C-band frequency range has raised concerns regarding potential interference with aeronautical radar altimeters. 5G technology utilizes the C-band in the range of 3.7–3.98 GHz, which partially overlaps with the frequency range used by radar altimeters operating in the range of 4.2–4.4 GHz, resulting in an increased possibility of interference between the two systems. In this study, a comprehensive methodology was employed to conduct an interference analysis, investigating the compatibility between 5G wireless systems and radar altimeters. This involved implementing a realistic scenario that replicated the operational interaction between radar altimeters and 5G systems, with the goal of identifying the impact of 5G networks on radar altimeter performance. This paper outlines the scenarios leading to interference, and suggests feasible methods to overcome this issue.

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“…Radar altimeters are the sole indicators of altitude above a terrain. Spectrally adjacent 5 G cellular bands pose significant risks of jamming altimeters 1,2 and impacting flight landing and take-off. As wireless technology expands in frequency coverage 3,4 and utilises spatial multiplexing 5 (Fig.…”

Section: Introductionmentioning

confidence: 99%

A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency

Zhang,

Lederman,

Ferreira de Lima

et al. 2024

Light Sci Appl

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Radio-frequency interference is a growing concern as wireless technology advances, with potentially life-threatening consequences like interference between radar altimeters and 5 G cellular networks. Mobile transceivers mix signals with varying ratios over time, posing challenges for conventional digital signal processing (DSP) due to its high latency. These challenges will worsen as future wireless technologies adopt higher carrier frequencies and data rates. However, conventional DSPs, already on the brink of their clock frequency limit, are expected to offer only marginal speed advancements. This paper introduces a photonic processor to address dynamic interference through blind source separation (BSS). Our system-on-chip processor employs a fully integrated photonic signal pathway in the analogue domain, enabling rapid demixing of received mixtures and recovering the signal-of-interest in under 15 picoseconds. This reduction in latency surpasses electronic counterparts by more than three orders of magnitude. To complement the photonic processor, electronic peripherals based on field-programmable gate array (FPGA) assess the effectiveness of demixing and continuously update demixing weights at a rate of up to 305 Hz. This compact setup features precise dithering weight control, impedance-controlled circuit board and optical fibre packaging, suitable for handheld and mobile scenarios. We experimentally demonstrate the processor’s ability to suppress transmission errors and maintain signal-to-noise ratios in two scenarios, radar altimeters and mobile communications. This work pioneers the real-time adaptability of integrated silicon photonics, enabling online learning and weight adjustments, and showcasing practical operational applications for photonic processing.

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Interference Analysis for Compatibility between 5G system and Aeronautical Radio Altimeter

Cited by 9 publications

References 0 publications

The Method of Evaluation of Radio Altimeter Methodological Error in Laboratory Environment

The Method of Evaluation of Radio Altimeter Methodological Error in Laboratory Environment

Airborne Safety in the Age of 5g: Assessing the Potential Interference Between C-Band and Aeronautical Radar Altimeter

A system-on-chip microwave photonic processor solves dynamic RF interference in real time with picosecond latency

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