A study of radar elevation-angle errors due to atmospheric refraction

Fannin, B. M.; Jehn, K. H.

doi:10.1109/tap.1957.1144468

Cited by 13 publications

(3 citation statements)

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“…In general, many studies on target detection performance have been investigated considering RCS fluctuations with clutters [19], multipath effects [20], regional environments [21], and refractive profiles [22][23][24]. In this research, we calculate the probability of the target detection using thresholds derived from the free-space path loss levels to examine the target detection performance.…”

Section: Target Detection Performance In Abnormal Atmospherementioning

confidence: 99%

Analysis of the Target Detection Performance of Air-to-Air Airborne Radar Using Long-Range Propagation Simulation in Abnormal Atmospheric Conditions

Lim

Seo

et al. 2020

Applied Sciences

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In this paper, we propose the analysis of the target detection performance of air-to-air airborne radars using long-range propagation simulations with a novel quad-linear refractivity model under abnormal atmospheric conditions. The radar propagation characteristics and the target detection performance are simulated using the Advanced Refractive Effects Prediction System (AREPS) software, where the refractivity along the altitude, array antenna pattern, and digital terrain elevation data are considered as inputs to obtain the path loss of the wave propagation. The quad-linear model is used to approximate the actual refractivity data, which are compared to the data derived using the conventional trilinear refractivity model. On the basis of the propagation simulations, we propose a detection performance metric in terms of the atmosphere (DPMA) for intuitively examining the long-range propagation characteristics of airborne radars in air-to-air situations. To confirm the feasibility of using the DPMA map in various duct scenarios, we employ two actual refractive indices to observe the DPMA results in relation to the height of the airborne radar.

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Section: Target Detection Performance In Abnormal Atmospherementioning

confidence: 99%

Analysis of the Target Detection Performance of Air-to-Air Airborne Radar Using Long-Range Propagation Simulation in Abnormal Atmospheric Conditions

Lim

Seo

et al. 2020

Applied Sciences

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“…It is co mmon in ray Lracing s tudies to assume that the rcfracLi,:e indcx ofLlle aLmospllere is sph erically traLlfl ccl With respect to th e surface of th(' earLh [1,2,3,4,5].2 Thus, 1,ll e eHect of refractive index changes in th e horizontal diroction is normally not consid er ed, although recenLly \ Vong [6] ha s considered th e effect of matb emaLicaliy smooLb h orizontal changes in airbo rne propagation probl('ms.…”

Section: Introductionmentioning

confidence: 99%

Effect of atmospheric horizontal inhomogeneity upon ray tracing

Bean¹,

Cahoon²

1959

J. RES. NATL. BUR. STAN. SECT. D. RAD. PROP.

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The tracing of radio rays is normally carried out under the ass umpt ion that t h e r efr active index varies only in t he vertical direction. Although this assumption appears to be quite reasonable in the average or climatic sense, it is seldom satisfi ed under actu al conditions a nd is strongl y violated by horizontal airm ass changes occ urrin g near frontal and land-sea interfaces. This lattcr casc is investigated by tracin g rays t hrough two i nstances of obser ved marked h orizontal variation of t h c refractive ind cx. The bending for t hese ray paths was t hcn co mpa red wIth valucs obtflin cd und er t h e no rmal ass umption of hori zontal homogeneity .Although at 1 kilom ctcr and abo\'c t hcse horizontal changcs appear to have littl e cffect !"a.VS emitted at low clcvation a nglcs a rc se nsitive t o cxtrcme horizontal variation s of th~ atmosphere nea r t he s urface, such as those assoc iaLed with ducLing con di tion s. H O" 'cver sin ce it ap pea,rs that s uch conditions occur lcs t ha n]5 p erce nt of t he t im e at most locations' t hc m a jority of r ay-pat h calcu la.lions may b e ca.rried Oll t under thc norma l assl.l mp Lion o·r hori zo ntal straLifi cation of the r cfrflct ivc ind ex.

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“…이를 보상하기 위해서는 대류권 및 전리층까지의 전파 전달 특성에 대해서 알아야 하고, 이와 같은 연구들은 예 전부터 많은 연구가 진행되고 있었다 [1], [2] . 앞에서 이야기했듯이, 대기의 굴절에 의해서 레이다로 부터 표적까지의 거리 정보, 정확하게는 표적의 고도 정 보에는 오차가 발생하게 된다.…”

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Mathematical Modeling of Wave Propagation Considering the Atmospheric Effects and Its Application

이태승¹,

최상혁²,

전주환³

et al. 2016

The Journal of Korean Institute of Electromagnetic Engineering

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In this paper, we propose a method that represents a mathematical form of wave propagation by using the fact the refractive index determining wave propagation characteristic is a function of altitude. Proposed method uses Snell's law that expresses relationship between incident angle and refraction angle when incident wave passes medium having a different refractive index. We present the simulation results about wave propagation by setting the square of refractive index in the form of the polynomial for altitude and show that it is possible to estimate the coefficients of the polynomial through the angle information from vertical axis of multiple radar systems.

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A study of radar elevation-angle errors due to atmospheric refraction

Cited by 13 publications

References 0 publications

Analysis of the Target Detection Performance of Air-to-Air Airborne Radar Using Long-Range Propagation Simulation in Abnormal Atmospheric Conditions

Analysis of the Target Detection Performance of Air-to-Air Airborne Radar Using Long-Range Propagation Simulation in Abnormal Atmospheric Conditions

Effect of atmospheric horizontal inhomogeneity upon ray tracing

Mathematical Modeling of Wave Propagation Considering the Atmospheric Effects and Its Application

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