Navigation Systems

Kayton, Myron

doi:10.1201/9781420036879.ch13

Cited by 20 publications

(33 citation statements)

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“…The first group consists of constant or slowly time-varying fields generated by ferromagnetic structural materials in the proximity of the magnetometers. The field measurement errors resulting from such interferences are referred to as hard iron biases [7].…”

Section: Error Modellingmentioning

confidence: 99%

Calibration of Strapdown Magnetometers in Magnetic Field Domain

et al. 2006

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This paper presents an algorithm for calibrating strapdown magnetometers in the magnetic field domain. In contrast to the traditional method of compass swinging, which computes a series of heading correction parameters and, thus, is limited to use with two-axis systems, this algorithm estimates magnetometer output errors directly. Therefore, this new algorithm can be used to calibrate a full three-axis magnetometer triad. The calibration algorithm uses an iterated, batch least squares estimator which is initialized using a novel two-step nonlinear estimator. The algorithm is simulated to validate convergence characteristics and further validated on experimental data collected using a magnetometer triad.It is shown that the post calibration residuals are small and result in a system with heading errors on the order of 1 to 2 degrees.

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Section: Error Modellingmentioning

confidence: 99%

Calibration of Strapdown Magnetometers in Magnetic Field Domain

et al. 2006

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“…For a detailed overview of the history of DNSs development we refer to [31]. Detailed description of the Doppler navigation principles and DNS functionality can be found, e.g., in [2,[32][33][34].…”

Section: Doppler Navigation System Functions and Applicationsmentioning

confidence: 99%

“…The rapid development of radars leads not only to their integration, but also to the extension of their functionality and applicability [2]. Remote sensing of the water surface and of the near-surface wind appears one of the promising additional applications of airborne radars.…”

Section: Introductionmentioning

confidence: 99%

Sea Wind Measurement by Doppler Navigation System with X-Configured Beams in Rectilinear Flight

et al. 2017

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Abstract:We suggest a conceptual approach to the measurement of the near-surface wind vector over water using a Doppler navigation system, in addition to its standard navigation capabilities. We consider a Doppler navigation system with a track-stabilized antenna and x-configuration of its beams. For the measurement of the sea-surface wind, the system operates in the multi-beam scatterometer mode in rectilinear flight. The proposed conceptual design has been validated, and its accuracy for the wind vector measurement has been estimated using Monte Carlo computational simulations.

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“…서 론 초고주파(RF: Radio Frequency)를 이용하는 전파고도계 (RA: Radar Altimeter)는 플랫폼과 표적사이의 상대고도를 측정하기 위해 전파를 송신하고, 되돌아오는 반사파를 수 신하여 두 전파사이의 상호관계를 이용하여 고도를 측정 하는 시스템이다 [1] . 일반적으로 전파고도계에 널리 사용 되는 방식인 FMCW(Frequency-Modulated Continuous-Wave) 방식은 시간에 따라 주파수가 선형적으로 변하는 주 파수 변조(FM) 신호를 연속적으로 송신하고, 표적에 반 사되어 시간 지연된 신호를 수신하여, 송신 신호와 수신 신호와의 주파수 차(beat frequency)를 측정함으로써 표적 과의 거리를 계산한다 [2]～ [5] .…”

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Development of an FMCW Radar Altimeter Simulator Using Optical Delay Lines

Lee¹

2017

J. Korean Inst. Electromagn. Eng. Sci.

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This paper presents the design method of an FMCW(frequency-modulated continuous-wave) altitude simulator which generates propagation delay signals according to target distances to test the radar altimeter. To improve the conventional RF method for creating delay signals, the simulator is designed by the RF-optics-RF method using optical delay lines. In addition, it is designed to simulate the Doppler shift and jamming that may occur in actual flight environment. In order to evaluate the performance of the developed simulator, the integration tests have been conducted with the radar altimeter. Through the test, we successfully verified the performance of the simulator.

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Navigation Systems

Cited by 20 publications

References 0 publications

Calibration of Strapdown Magnetometers in Magnetic Field Domain

Calibration of Strapdown Magnetometers in Magnetic Field Domain

Sea Wind Measurement by Doppler Navigation System with X-Configured Beams in Rectilinear Flight

Development of an FMCW Radar Altimeter Simulator Using Optical Delay Lines

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