Name 

Description 

AFGLAMOS 

Returns the value of the AFGLAMOS night turbulence profile given altitude above sea level in meters. 

AFRLDE_Atmos 

Returns model data for absorption and scattering coefficients, and temperature as a function of altitude h for a given wavelength and atmospheric condition. Models were developed for 0 km to 11 km altitude, but can be extended to higher altitudes. COIL analysis was performed for 1.31521 microns wavelength (see reference below). 

AIRS 

Return model data interpolated from Atmospheric InfraRed Sounder (AIRS) measurements. 

ApparentGravity 

Returns the value of the apparent gravity profile given altitude above sea level in meters and latitude. This function will generate the slight changes in gravity with altitude. It is valid from the surface to 86 km above mean sea level. 

AtmModels 

Currently supported models:

• Cn2:
  • AFGL AMOS Cn2 = AFGLAMOS(h)
  • Clear1Night Cn2 = Clear1Night(h)
  • Clear2Night Cn2 = Clear2Night(h)
  • DLRmodHV57 Cn2 = DLRmodHV57(h,meanRefract)
  • dynamicPiecewiseMaritimeAIRS Cn2 = dynamicPiecewiseMaritimeAIRS( ... h,[Cn2_0],[locale],[ht],[Cn2_ht]);
  • GreenwoodCn2 Cn2 = GreenwoodCn2(h)
  • Hufnagel-Valley Cn2 = HufnagelValley(h,V,A)
  • Hufnagel-Valley (5/7) Cn2 = HV57(h)
  • LEEDRAtmos* Cn2 = LEEDRAtmos(h,'C')
  • Maui 3 Cn2 = Maui3Cn2(h)
  • Modified Hufnagel-Valley Cn2 = ModHufnagelValley(h)
  • Random Cn2 Cn2 = RandCn2(h,x,dx,'model',Params)
  • SLC Day Cn2 = SLCDay(h)
  • SLC Night Cn2 = SLCNight(h)
  • Uniform Cn2 Cn2 = UniformCn2(h,C0)
  • WMSR Cn2 Cn2 = WSMRCn2(h,ModelType,GroundAlt)
  • NSLOT Cn2... more 

AverageAtm 

Computes the average values of the input model over the specified phase screen slabs. Can be used with any model type. 

BoundaryAtm 

Maps input altitudes in the interval [hInt(1),hInt(2)] into altitudes in the interval [hhInt(1) hhInt(2)] before calling the atmospheric model 'BaseModel' with altitude hh given parameters p1,...,pN.
Intended to facilitate using atmospheric models in the earth's boundary layer where certain altitudes should be referenced to ground level, and other altitudes should be referenced to sea level. Generally, hInt(2) = hhInt(2) = boundary-layer altitude limit. However, code will accept other inputs and use them accordingly. Altitudes in interval hInt are set according to: hh = hhInt(1)+(diff(hhInt)/diff(hInt)).*(h-hInt(1)); Input altitudes less than hInt(1) are set to hhInt(1). 

Bufton 

Returns value of the Bufton wind model for input altitude h. This model was originally used for wind profiles from the Maui Space Surveillance Site on Haleakala and as such, the altitude corresponding to z = 0 is 3048 meters above MSL when using the default values for vg, hpk, hscale, and vt - see reference 2 below. 

CalcHRange 

Calculates horizontal range HRANGE for MODTRAN and FASCODE based on altitude. 

ChangeAtm 

Function to change parameters of an existing Atm structure. Any of the allowed atmospheric models from AtmStruct can be changed, in addition to geometry, number of screens, maximum altitude, turbulence multiplier alpha when a Cn2 model is present, and wavelength in extinction models. For a change in wavelength to work properly, a wavelength string must be the third input to the model function. Additionally, multipliers of other profiles can be specified with the input 'alpha[model]' for the parameter name. To change turbulence multiplier, specify either 'alphaCn2' or 'alpha.' 

Clear1Night 

Returns the value of the CLEAR-1 night turbulence profile given altitude above sea level in meters. CLEAR-1 night is only defined from 1230 m to 30 km altitude, however, this function will return values for altitudes lower than 1230 m and higher than 30 km. The values below 1230 m are an extrapolation of the model form between 1230 m and 2130 m. The values above 30 km are an extrapolation of the model form between 10.34 km and 30 km. 

Clear2Night 

Clear 2 Night turbulence profile. Profile is based on data taken above White Sands Missile Range. Data-based profile function is defined for 1230 m <= h <= 30 km. Ground level of model is h = 1216 m, and for numerical convenience we define Cn2 below 1230 m to be equal to the model value at 1230 m. For h > 30 km, returned values are an extrapolation of the data-based function. 

Clear2Wind 

Value of Clear-2 wind model. 

dewPt2RH 

Converts a dew point temperature to a relative humidity given the air temperature. 

DLRmodHV57 

Returns the value of the DLR-modified Hufnagel-Valley (5/7) turbulence profile given altitude above sea level in meters 

dynamicPiecewiseMaritimeAIRS 

Computes Cn2 using AFIT's dynamic piecewise model based on AIRS maritime observations. 

DynamicViscosity 

Returns the dynamic viscosity as a function of temperature. 

EdlenOwens67 

Compute the refractive index modulus for a given lambda based on work published by Owen. 

EqualCn2Screens 

Calculates path-normalized phase screen positions and thicknesses for equal strength phase screens. This function first calculates the plane wave coherence length, $r_0^{-5/3}$, and divides by Nscreens so that each segment will have the same strength. This function discretizes the calculation by breaking the path into n segments per meter and integrating $C_n^2$ to reach the desired strength per phase screen. If Atm.MaxAlt is not infinite, output screen positions are over the path where altitude is less than Atm.MaxAlt as assumed by AtmStruct. 

FAS_TAPE6 

This function is used with function FASCODE to extract the output of FASCODE from the TAPE6 file. 

FASCODE 

This function runs FASCODE and return a structure that has the output. The output includes the trans. and extinction coefficient. FASCODE is not distributed with ATMTools. The user must obtain a version of FASCODE and install in ATMTools/OTT/FASCODE. 

GADSAtmos 

Generates absorption and scattering coefficients as well as temperature and pressure using the Global Aerosol Data Set (GADS) and LEEDR/ExPERT meteorological data. It will generate the proper structure for use in LEEDRAtmos based on the provided inputs. 

GreenwoodCn2 

Returns the value of the Greenwood turbulence profile given altitude above sea level in meters. 

HufnagelValley 

Returns the value of the Hufnagel-Valley turbulence profile given altitude above sea level in meters. Defaults to HV (5/7) if v and A are not passed. Can also compute and use v and A if wavelength, r0, and theta0 are provided. 

HV57 

Returns the value of the Hufnagel-Valley (5/7) turbulence profile given altitude above sea level in meters. 

InnerScale 

Function for computing inner scale as a function of altitude using a physical model. 

LEEDRAtmos 

Generates model data at specified altitudes, h, based on precomputed LEEDR data generated using the buildLEEDRAtmos function. 

LEEDRWxCube 

Generates model data at specified altitudes (AGL), h, based on precomputed LEEDR Wx Cube data generated using the buildLEEDRWxCube function. To convert between MSL (used by SHaRE and ATMTools) and AGL, use TerrainAtm (requires DTED data from http://earthexplorer.usgs.gov/ - see bilLoad). If the weather cube was generated using buildLEEDRWxCube, there is an option to also generate the terrain elevation data for the cube (provided the DTED data is available). If DTEDdir is true or if DTEDdir specifies a directory with the necessary DTED data, terrain elevation data will be computed if it doesn't already exist and elevation.h5 file... more 

LogScaling 

Returns $y = A*{base}^{-(h/B)}$, to be used for generic altitude-dependent, logarithmically-decreasing atmospheric models with surface value A and scale height B. 

LUTAtm 

General LUT function for extrapolating atmospheric data. The specified Matlab data file must contain a vector Altitude and a vector for the desired data. 

Maui3Cn2 

Maui 3 Turbulence profile as defined in standard literature. This is the most recent (vintage Feb 2003) model for propagation above Maui's Mt. Haleakala. It is considered more correct than the old AFGL AMOS model for matching median propagation quantities. Maui 3 has been designated the official Maui-site model for the Active Track program. Data-based profile values are defined for h > 3050 m. Ground level is h = 3038 m, and for numerical convenience we define Cn2 below 3050m to be equal to Cn2(3050m). 

MIEV0 

Computes Mie scattering and extinction efficiencies; asymmetry factor; forward- and backscatter amplitude; scattering amplitudes vs. scattering angle for incident polarization parallel and perpendicular to the plane of scattering; coefficients in the Legendre polynomial expansions of either the unpolarized phase function or the polarized phase matrix; some quantities needed in polarized radiative transfer; and information about whether or not a resonance has been hit. This MATLAB code is a transcription of the original FORTRAN code by Wiscombe (see references). Where possible, vectorization has been implemented. MOST input and internal variables and names have been preserved. NOTE : S1, S2, SFORW, SBACK,... more 

MOD_TAPE6 

This function is used with function MODTRAN to extract the output of MODTRAN from the TAPE6 file. 

MODFAS 

Returns model data for absorption and scattering coefficients as a function of altitude h for a given wavelength and atmospheric condition determined by parameters used in MODTRAN and FASCODE. Lookup table data is from 0 to 50 km altitude (Returns zero for altitudes outside the available data). See inputs for list of supported wavelengths. 

ModHufnagelValley 

Returns the value of the Modified Hufnagel-Valley turbulence profile given altitude above sea level in meters 

MODTRAN 

This function runs MODTRAN and returns a structure that has the output. The output includes the molecular and aerosol extinction coefficients. MODTRAN is not distributed with ATMTools. The user must obtain MODTRAN separately from Spectral Sciences, Inc (www.spectral.com/) and install in ATMTools/OTT/MODTRAN. 

NSLOT_v2 

Bulk model for computing surface-layer scaling parameters, and the refractive index structure parameter from mean values of meteorological quantities measured near the ocean surface. The wind speed, air temperature and air humidity must be measured between 1 and 50 m above the ocean surface. The model will still run if either the pressure or pressure measurement height inputs are bad (data_flag <= 3). In such cases the pressure is defaulted to 1013.25 mb and the pressure measurement height is defaulted to 10 m. The model will not run if any other inputs besides the pressure and/or pressure measurement height are... more 

OceanAtmos 

Generates absorption and scattering coefficients as well as temperature and pressure using the LEEDR oceanic database and the Advanced Navy Aerosol Model (ANAM) or the Navy Aerosol Model (NAM). It will generate the proper structure for use in LEEDRAtmos based on the provided inputs. 

OuterScale 

Function for computing outer scale as a function of altitude. Specifying OuterScale(h) is the same as OuterScale(h,'Physical'). 

PathDisp 

Computes displacement of 2 beams (designated beam 1 and beam 2) along propagation path based upon the input displacement type 'DispType' and accompanying parameters. Specified separations should be thought of as applied to beam 2, and reported displacement vector is from beam 1 to beam 2. That is, if vector r1 locates beam 1 and r2 locates beam 2, then r1 + d = r2. 

processAIRShdf 

Download AIRS data, save to HDF file and optionally process and save to a MAT file. Data can also be downloaded from http://mirador.gsfc.nasa.gov/. Using this function to download data requires functions that are not distributed with ATMTools. 

RandCn2 

Returns a random Cn2 profile based on the input Cn2 model, baseModel, with the values specified by fixParam constrained to be equal to the computed values from the baseModel profile. 

RefIndex 

Given an altitude vector h this function computes the refractive index and the derivative of the refractive index at the heights specified in the h vector for the particular lambda provided. 

ReverseAtm 

Reverses the input atmosphere and geometry making the target position and velocity the platform position and velocity and vice versa. 

SLCDay 

Returns the value of the SLC daytime turbulence profile given altitude above sea level in meters 

SLCNight 

Returns the value of the SLC nighttime turbulence profile given altitude above sea level in meters 

SOR2miAtm 

Returns an atmospheric modeling (Atm) structure containing Cn2 modeling data with 10 path segments for specified conditions. Based upon differential-tilt turbulence profiler measurements made Sep 2004 at Starfire Optical Range, Kirtland AFB, NM for propagation from SOR to the "2 mile" test site. Atm structure will have Atm.Cn2 values for the specified conditions, and Atm.Cn2Eval = 'NoEval'. Also returns the ECF geometry structure for specified path as an optional second output. 

SORWind 

Starfire Optical Range (SOR) wind profile as a function of altitude and time of year. 

SpeedOfSound 

Returns the speed of sound as a function of temperature. It is also possible to input a G structure or an Atm structure to evaluate the speed of sound at various altitudes. The temperature at these altitudes is assumed to be modeled by US_Standard76, unless otherwise specified by Atm.TempEval. 

TerrainAtm 

This function returns the value of an atmospheric model evaluated for screen altitude above ground level. Must have the necessary DTED files downloaded for bilLoad. 

UniformAtm 

Returns the value of a uniform (constant) model over a propagation path given input ModelValue for an arbitrary atmospheric characteristic. UniformAtm is a function of altitude h to work with ATMTools framework, and returns a vector Model of size(h). However, the value returned is constant with respect to altitude variation. May be used to represent any atmospheric characteristic that does not vary over a propagation path. 

UniformCn2 

Returns the value of a uniform (constant) Cn2 value over a propagation path given an input value C0, or given a specified atmospheric parameter, its value, and the wavelength, range, and (if applicable) the set of discrete turbulence phase screens for which the parameter value was calculated. UniformCn2 is a function of altitude h to work with ATMTools framework, and returns a Cn2 vector the size(h), but the Cn2 value returned is constant with respect to altitude variation. 

US_Standard76 

This function calculates the Temperature, Pressure, or Density at given altitudes. 

VTP2VLLA 

Converts velocity in the target TP coordinate frame defined in a plane perpendicular to the propagation to an LLA velocity based on the platform and target locations. Can specify an alternate vector for projection of the zenith onto the plane perpendicular to the propagation, upDir, for an arbitrary rotation of the TP coordinate frame. One can also specify that the platform be used as the basis for the TP coordinate frame. This option should be used if the user wants to analyze the reverse geometry but does not want to change the relationship between TP/XY and the propagation direction. 

WSMRatm 

Returns an atmospheric modeling (Atm) structure containing Cn2 modeling data with 10 path segments for specified conditions. Based upon differential-tilt turbulence profiler measurements made May-Aug at White Sands Missile Range for propagation between North Oscura Peak (NOP) and the Beck test site. Atm structure will have Atm.Cn2 values for the specified conditions, and Atm.Cn2Eval = 'NoEval'. Also returns the ECF geometry structure for specified path as an optional second output. Range of dates to be used and range of hours on those dates can be specified. Nature of the output is determined by input OutputType (see options below) 

WSMRCn2 

Returns the value of the WSMR turbulence profile given altitude above ground level in meters. If input altitude is specified as meters above sea level, the ground altitude can optionally be specified. The model identified as '80%WorstSpring' is the 80th percentile worst Cn2 for springtime measurements collected between 1000-1400 local time at WSMR. 

WSMRWind 

Returns the value of the White Sands Missile Range wind profile. 

WSMRWindHeading 

Returns the value of the White Sands Missile Range wind heading profile.