[논문]Performance Analysis of MLAT System Receiver for Aircraft Flight Control System

Yoo, Sang-Hoon; Oh, Jeong-Hun; Koh, Young-Mok; Kim, Su-Hong; Sung, Tae-Kyung

doi:10.11003/jpnt.2016.5.1.029

Performance Analysis of MLAT System Receiver for Aircraft Flight Control System 원문보기

Journal of Positioning, Navigation, and Timing, v.5 no.1, 2016년, pp.29 - 36

Yoo, Sang-Hoon (Department of Information and Communication Engineering, Chungnam National University) , Oh, Jeong-Hun (Department of Information and Communication Engineering, Chungnam National University) , Koh, Young-Mok (Technique research center of Woori-Byul) , Kim, Su-Hong (Technique research center of Woori-Byul) , Sung, Tae-Kyung (Department of Information and Communication Engineering, Chungnam National University)

Abstract ▼ AI-Helper

In this paper, performance on receivers of multilateration (MLAT) system that uses ADS-B signal, which is recently becoming popular, was analyzed to overcome shortcomings of existing aircraft flight control systems or reinforce the capabilities. A link budget was analyzed using a channel model in the airport environment with regard to Local Area Multilateration (LAM) for ground-controlled landing around the airport. In order to detect signals that arrived at the receiver successfully, sensitivity of receiver was analyzed using a signal-to-noise ratio (SNR) worksheet, and a method that improves accuracy of the distance measurement was proposed by adopting a peak estimation using sampling signals. Through simulations, optimum specifications of receivers were analyzed to have high precision positioning of LAM, and accuracy of LAM distance measurements was presented.

주제어

AI 본문요약
AI-Helper

제안 방법

In this paper, a method is proposed to acquire a measured value of distance with high precision in the receivers of the LAM system. In Section 2, a structure of the ADS-B signal transmitted by a transponder in the aircraft is analyzed and indoor channel model and link budget are analyzed in the airport environment.
Since the sampling timing and correlator peak are not exactly matched with each other, the accuracy of a distance measured value is degraded due to the limitation of distance resolution if direct distance measured value is calculated using a sampling measured value. In this paper, signal detection abilities are analyzed using the SNR worksheet to analyze the performance of the receiver and performance of the peak estimation method according to sampling frequency in the multi-path environment and accuracy of distance measured value are analyzed.
In this paper, the sensitivity of receivers used in the LAM system that assist aircraft taking off and landing as well as control of moving objects in the ground runway using ADS-B signals. A link budget was analyzed at the LAM transmitter using indoor distance channel model in the airport environment and the sensitivity of receiver was analyzed using a SNR worksheet to detect signals arrived at the receiver successfully.
In Section 2, a structure of the ADS-B signal transmitted by a transponder in the aircraft is analyzed and indoor channel model and link budget are analyzed in the airport environment. Next, sensitivity of receivers in the LAM system is analyzed through the SNR worksheet in order to detect signals at the receiver. In addition, a maximum likelihood (ML)-based peak estimation method is applied to minimize a distance error due to the digital sampling resolution.

데이터처리

6 m for each sampling frequency were verified and through these values, it was found that a position error reference shall use a sampling frequency larger than 50 MHz. The errors of all measured values obtained through simulations were compared with position error references thereby calculating a ratio of measured value that satisfied the position error reference as a probability, which is shown in Fig. 9.

이론/모형

The MET method requires a high sampling frequency to reduce the multipath error. In this paper, the ML-based peak estimation method is used to analyze distance estimation accuracy according to sampling frequencies in order to analyze the performance of peak estimation method according to a wide range of sample frequencies.
01 in the Poisson probability variable of tapped delay time in the TDL channel model. The ML method is used to perform peak estimation. Fig.
In this section, the sensitivity of the receiver is analyzed through the resolution error estimation when peak estimation is applied using four samples when a sampling frequency is set to 10 - 100 MHz. The aforementioned channel model was applied and this channel model consists of Hata model, which is a path loss model, and TDL channel model, which is a multipath model. λ was defined as 0.

성능/효과

In this paper, the sensitivity of receivers used in the LAM system that assist aircraft taking off and landing as well as control of moving objects in the ground runway using ADS-B signals. A link budget was analyzed at the LAM transmitter using indoor distance channel model in the airport environment and the sensitivity of receiver was analyzed using a SNR worksheet to detect signals arrived at the receiver successfully. The performance of ML-based peak estimation method was analyzed to measure a distance with high precision using sampling signals.
Assuming that a reference of distance measured value error is 2σ, errors of 18.2 m, 7.4 m, 4.4 m, 3.4 m, and 1.6 m for each sampling frequency were verified and through these values, it was found that a position error reference shall use a sampling frequency larger than 50 MHz
It was found that as sampling frequency became higher, the distance measured values became accurate. In particular, when peak estimation method was applied by sampling at 50 MHz or higher frequency, the position specification of the LAM system can be satisfied with 95% position accuracy. The study result in this paper can contribute to implementation of inexpensive receiver equipment at base stations.
The performance of ML-based peak estimation method was analyzed to measure a distance with high precision using sampling signals. It was found that as sampling frequency became higher, the distance measured values became accurate. In particular, when peak estimation method was applied by sampling at 50 MHz or higher frequency, the position specification of the LAM system can be satisfied with 95% position accuracy.
The Root Mean Square Error of the estimated delay time tau was 30.4 ns for 10 MHz, 12.6 ns for 20 MHz, 7.6 ns for 40 MHz, 5.9 ns for 50 MHz, and finally 2.7 ns for 100 MHz. When these are converted into distance errors, errors of 9.
A link budget was analyzed at the LAM transmitter using indoor distance channel model in the airport environment and the sensitivity of receiver was analyzed using a SNR worksheet to detect signals arrived at the receiver successfully. The performance of ML-based peak estimation method was analyzed to measure a distance with high precision using sampling signals. It was found that as sampling frequency became higher, the distance measured values became accurate.
8. The result confirmed that as sampling frequency became higher, delay time error became smaller.
9. Through the result, if a sampling frequency was larger than 50 MHz, it can satisfy the performance required by the LAM system. Under 2.
7 shows the probability distribution diagram of delay time estimation error according to sampling frequency. To obtain reliable probability distribution diagram, 10,000,000 times of simulations as per sampling frequency were conducted.
Through the result, if a sampling frequency was larger than 50 MHz, it can satisfy the performance required by the LAM system. Under 2.5 NM and 5 NM environments, additional performance evaluation was not carried out since not only layout of the base stations but also surrounding topography have to be considered in contrast with the runway environment.
7 ns for 100 MHz. When these are converted into distance errors, errors of 9.1 m, 3.7 m, 2.2 m, 1.7 m, and 0.8m for each sampling frequency can be obtained. These errors are shown in Fig.

후속연구

In particular, when peak estimation method was applied by sampling at 50 MHz or higher frequency, the position specification of the LAM system can be satisfied with 95% position accuracy. The study result in this paper can contribute to implementation of inexpensive receiver equipment at base stations.

참고문헌 (12)

Cho, T. H.; Song, I. S.; Jang, E. M., Yoon, W. O., & Choi, S. B. 2012, A Study on the improvement of the Multilateration data by emplying an IMM filter, Journal of The Korea Navigation Institute, 16, 578-585
Han, Y. H. 2012, A Design for a Model-Based Multipath Mitigation Method using Multi-Epoch, M.S Dissertation, Chungnam National University
ITU-R M.1225 1997, Guidelines for Evaluation of Radio Transmission Technologies for IMT-2000, January. 1997.
Johnson, J., Neufeldt, H., & Beyer, J. 2012, Wide Area Multilateration and ADS-B Proves Resilient in Afghanistan, in Proceedings of ICNS, pp.A6-1-A6-8
Kim, T. S., Jang, J. W., & Kim, S. W. 2012, Study on the Development Plan of the Aeronautical Surveillance System of Multilateration, KSAS, pp.1805-1810
Mantilla-Gaviria, I. A. 2013, New strategies to improve multilateration systems in the air traffic control, PhD Thesis, Universitat Politecnica de Valencia
Miyazaki, H., Koga, T., Ueda, E., Kakubari, Y., & Nihei, S. 2011, Development of High Performance WAM system, in Proceedings of ESAV, pp.237-240
Miyazaki, H., Koga, T., Ueda, E., Yamada, I., Kakubari, Y., et al. 2010, Evaluation Results of Multilateration at Narita International Airport, ENRI Int. Workshop on ATM/ CNS. Tokyo, Japan (EIWAC 2010), pp.41-46
Park, Y. W., Hong, E. K., & Choi, J. H. 2010, Fundamentals of Mobile Communication, 3rd ed. (Paju: Life&Power Press), p.182
Qi, Y. & Kohno, R. 2005, Mitigation of Sampling-induced Errors in Delay Estimation, in Proceedings of ICU, pp.402-407
RTCA SC-186 2009, Minimum Operational Performance Standards for 1090 MHz Extended Squitter Automatic Dependent Surveillance ？ Broadcast (ADS-B) and Traffic Information Services ？ Broadcast (TIS-B), December 2, 2009.
van Diggelen, F. 2009, A-GPS: Assisted GPS, GNSS, and SBAS (Boston, London: Artech House)

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Performance Analysis of MLAT System Receiver for Aircraft Flight Control System 원문보기

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Performance Analysis of MLAT System Receiver for Aircraft Flight Control System 원문보기

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