Link information provides the link
budget for a single access between a transmitter and a
receiver.
| Name |
Dimension |
Type |
Description |
| Time |
DateFormat |
Real Number |
Time. |
| Strand Name |
Unitless |
Text |
The strand name. |
| Link Name |
Unitless |
Text |
The strand name listed as from the receiver to the
transmitter. |
| Beam ID |
Unitless |
Text |
Reports out the unique Beam ID assigned to each new
beam which can consist of any combination of characters. A default
ID will be assigned to a new beam when you insert one, as well as
to a copy that you create via duplication. |
| Xmtr Beam ID |
Unitless |
Text |
Reports out the unique Beam ID assigned to each new
beam of a multibeam type transmitter which can consist of any
combination of characters. A default ID will be assigned to a new
beam when you insert one, as well as to a copy that you create via
duplication. |
| Xmtr Power |
PowerUnit |
Real Number |
The RF power output of the transmitter as measured
at the input to the antenna. This is a user selectable value. |
| Xmtr Gain |
RatioUnit |
Real Number |
The antenna gain of the transmitter which is
dependent on the antenna type selected. For transmitter models that
do not have an antenna model, this is a user defined value. For the
simple source transmitter, 0 dB is reported since the simple source
transmitter is modeled as an isotropic radiator. When using a
Multibeam Transmitter with the Beam Selection Strategy set to
Aggregate Active Beams, the Xmtr Gain element represents an
effective (not aggregate) gain that weighs the contribution of each
beam in the link direction according to its transmitted power. |
| EIRP |
PowerUnit |
Real Number |
The effective isotropic radiated power in the link
direction. This value is the product of the transmitter power and
the transmitter gain in the link direction with the inclusion of
user defined post transmit gains and losses. |
| Xmtr EIRP
Intensity |
PowerUnit |
Real Number |
Equivalent to EIRP over 4PI. |
| IBO |
RatioUnit |
Real Number |
In a power amplifier, Input BackOff (IBO) is a
measure of how far you must reduce the input power in order to
receive the desired output linearity and power. |
| OBO |
RatioUnit |
Real Number |
Output BackOff (OBO) is the reduction in power
applied to a power amplifier to minimize the effect of any
intermodulation products created by modulated carriers. |
| COverIm |
RatioUnit |
Real Number |
The process of modulation creates higher order
intermodulation products. The Carrier to Intermod ratio (C/Im) is a
power ratio between the Carrier and Intermodulation
components. |
| Xmtr Azimuth |
LongitudeUnit |
Real Number |
The transmitter azimuth (Phi) is the angle between
the transmitter body +x axis and the x-y projection of the link
vector in the antenna coordinate system. |
| Xmtr Elevation |
AngleUnit |
Real Number |
The transmitter elevation (Theta) is the angle
between the transmitter antenna bore-sight vector and the link
vector in the antenna coordinate system. |
| Range |
DistanceUnit |
Real Number |
The range (i.e., distance between the primary and
secondary object) at the given time. |
| Free Space Loss |
RatioUnit |
Real Number |
Loss due to propagation through free space. |
| Atmos Loss |
RatioUnit |
Real Number |
Loss calculated by the selected atmosphere
model. |
| Urban Loss |
RatioUnit |
Real Number |
Loss calculated by the selected Urban and
Terrestrial model. |
| Rain Loss |
RatioUnit |
Real Number |
Loss calculated by the selected rain model. |
| CloudsFog Loss |
RatioUnit |
Real Number |
Loss calculated by the Clouds and Fog model. |
| TropoScintill
Loss |
RatioUnit |
Real Number |
Loss calculated by the troposphere Scintillation
model. |
| UserCustomA Loss |
RatioUnit |
Real Number |
Loss calculated by custom loss scripting plugin
model A (written in VBscript, Perl or MATLAB). |
| UserCustomB Loss |
RatioUnit |
Real Number |
Loss calculated by custom loss scripting plugin
model B (written in VBscript, Perl or MATLAB). |
| UserCustomC Loss |
RatioUnit |
Real Number |
Loss calculated by custom loss scripting plugin
model C (written in VBscript, Perl or MATLAB). |
| Prop Loss |
RatioUnit |
Real Number |
The total propagation loss computed across all
enabled propagation models. |
| Rcvr Azimuth |
LongitudeUnit |
Real Number |
The receiver azimuth (Phi) is the angle between the
receiver body +x axis and the x-y projection of the link vector in
the antenna coordinate system. |
| Rcvr Elevation |
AngleUnit |
Real Number |
The receiver elevation (Theta) is the angle between
the receiver antenna bore-sight vector and the link vector in the
antenna coordinate system. |
| Rcvd. Frequency |
FrequencyUnit |
Real Number |
The received frequency is the frequency that the
receiver is tuned to in order to communicate with the transmitter.
This frequency may be auto-tracked or entered by the user in the
receiver properties. |
| Freq. Doppler
Shift |
FrequencyUnit |
Real Number |
The frequency Doppler shift is the offset in
frequency between the transmitted frequency and the received
frequency. This value is zero for auto tracked receivers. |
| Bandwidth
Overlap |
RatioUnit |
Real Number |
The bandwidth overlap factor is the fraction
(between 0 and 1) of transmitted power which is contained within
the receiver's bandwidth. The amount of power received by the
receiver is equal to the transmitted EIRP multiplied by the
bandwidth overlap factor and taking into account any propagation
losses. |
| Rcvd. Iso. Power |
PowerUnit |
Real Number |
Received isotropic power is the power at the
receiver before the pre-receive gains/losses and the receiver
antenna gain added (in dBW). It is equal to the EIRP with all the
channel losses as well as the bandwidth overlap applied. |
| Carrier Power at Rcvr Input |
PowerUnit |
Real Number |
Carrier Power at Rcvr Input is the power at the
receiver after the receiver antenna gain added (in dBW). It is
equal to the EIRP with all the channel losses as well as the
bandwidth overlap and receiver gain applied. |
| Flux Density |
PowerFluxDensityUnit |
Real Number |
The power from the desired transmitter crossing a
unit area normal to the direction of wave propagation. |
| Rcvr Gain |
RatioUnit |
Real Number |
Receiver Gain is the antenna gain (in dBi) of the
receiver which is dependent on the antenna type used. |
| Rcvr Beam ID |
Unitless |
Text |
Reports out the unique Beam ID assigned to each new
beam of a multibeam type receiver which can consist of any
combination of characters. A default ID will be assigned to a new
beam when you insert one, as well as to a copy that you create via
duplication. |
| Tatmos |
Temperature |
Real Number |
Tatmos is the antenna noise temperature component
attributed to the gaseous absorption model. |
| TUrbanTerres |
Temperature |
Real Number |
The noise temperature from the Urban and
Terrestrial model. |
| Train |
Temperature |
Real Number |
Train is the antenna noise temperature component
attributed to the rain model. |
| TcloudsFog |
Temperature |
Real Number |
The noise temperature from the Cloud and Fog
model. |
| TtropoScintill |
Temperature |
Real Number |
The noise temperature from the Troposhperic
Scintillation model. |
| TuserCustomA |
Temperature |
Real Number |
TuserCustomA is the antenna noise temperature
component attributed to user defined custom loss model A. |
| TuserCustomB |
Temperature |
Real Number |
TuserCustomB is the antenna noise temperature
component attributed to user defined custom loss model B. |
| TuserCustomC |
Temperature |
Real Number |
TuserCustomC is the antenna noise temperature
component attributed to user defined custom loss model C. |
| Tsun |
Temperature |
Real Number |
Tsun is the antenna noise temperature component
attributed to the sun. |
| Tearth |
Temperature |
Real Number |
Tearth is the antenna noise temperature component
attributed to the earth. This is applicable only to receivers not
on the ground. |
| Tcosmic |
Temperature |
Real Number |
Tcosmic is the antenna noise temperature component
attributed to the cosmic background. This is applicable only to
receivers not on the ground. |
| Tantenna |
Temperature |
Real Number |
Tantenna is the antenna noise temperature which is
the sum of all the noise source components. |
| Texternal |
Temperature |
Real Number |
The noise temperature specified by the external
noise temperature file. |
| Tother |
Temperature |
Real Number |
Tother is the antenna noise temperature component
attributed to other antenna noise sources. |
| Tequivalent |
Temperature |
Real Number |
The equivalent system temperature is specified by
the user as a constant value or computed at each time step from the
receiver system temperature parameters defined by the user. |
| Pol. Rel. Angle |
AngleUnit |
Real Number |
The angle corresponding to the relative mismatch
between the transmitted signal polarization and the receiver
polarization. |
| Polarization
Effic |
RatioUnit |
Real Number |
The polarization match between the transmitted
signal polarization and the receiving antenna (or in case of Simple
and Medium models implied antenna) polarization. It is computed on
a scale of 0 - - 1. The value of 1.0 represents the perfect match
between the transmitter and the receiver polarizations. On the
opposite end of the scale, the value of 0.0 represents a perfect
mismatch. STK also provides an option to model Cross Polarization
Leakage value. The polarization mismatch value cannot drop below
the user specified Cross Pol Leakage value. |
| g/T |
GainTempRatioUnit |
Real Number |
G/T = (Receiver Gain)/(System Temperature at the
Receiver). The ratio of the receive antenna gain G to the total
system temperature T is the "figure of merit" for the receiver (in
dB/K). The figure of merit is independent of the point where it is
calculated. However, the gain and system temperature must be
specified at the same point. |
| C/No |
SpectralDensityUnit |
Real Number |
The carrier to noise density ratio (C/No) where C
is the carrier power and No = kT (Boltzmann's constant x system
temperature) is the noise density. It is equivalent to C/N with a
normalized Bandwidth (B=1). |
| C/No Tot. |
SpectralDensityUnit |
Real Number |
The composite value of the carrier to noise density
ratio (C/No) across all hops of an analog bent pipe communications
link where C is the carrier power and No = kT (Boltzmann's constant
x system temperature) is the noise density. Note that C/No is
equivalent to C/N with a normalized Bandwidth (B=1). |
| Bandwidth |
FrequencyUnit |
Real Number |
Bandwidth is the Receiver Bandwidth. |
| C/N |
RatioUnit |
Real Number |
The carrier to noise ratio (C/N) where C is the
carrier power and N = kTB (Boltzmann's constant x system
temperature x bandwidth) is the noise power. |
| C/N Tot. |
RatioUnit |
Real Number |
The composite value of the carrier to noise ratio
(C/N) across all hops of an analog bent pipe communications link
where C is the carrier power and N equals kTB (Boltzmann's constant
x system temperature x bandwidth) is the noise power. |
| Eb/No |
RatioUnit |
Real Number |
The energy per bit to noise ratio (Eb/No) where Eb
is the energy per bit and No = kT (Boltzmann's constant * system
temperature). |
| Eb/No Tot. |
RatioUnit |
Real Number |
The composite value of energy per bit to noise
ratio (Eb/No) across all hops of an analog bent pipe communications
link where Eb is the energy per bit and No = kT (Boltzmann's
constant * system temperature). |
| BER |
Unitless |
Real Number |
Bit Error Rate (BER) is the probability that a bit
is in error (i.e. a zero is transmitted but a one is received). The
BER is the number of bits in error divided by the total number of
bits sent. STK uses table lookup from a .mod file to extract a BER
given an Eb/No. STK interpolates the table as necessary to
determine the appropriate bit error rate for a particular bit
energy level. If the bit energy is smaller than the first value in
the table, the bit error rate for the first value is used. If the
bit energy is larger than the last value in the table, a default
bit error rate of 1.0e-30 is used to indicate no errors. |
| BER Tot. |
Unitless |
Real Number |
Bit Error Rate (BER) Total is the probability that
a bit is in error (i.e., a zero is transmitted but a one is
received) across all hops of an analog bent pipe communications
link or a digital repeater communications link. The BER is the
number of bits in error divided by the total number of bits sent.
STK uses table lookup from a .mod file to extract a BER given an
Eb/No. STK interpolates the table as necessary to determine the
appropriate bit error rate for a particular bit energy level. If
the bit energy is smaller than the first value in the table, the
bit error rate for the first value is used. If the bit energy is
larger than the last value in the table, a default bit error rate
of 1.0e-30 is used to indicate no errors. |
| log(BER) |
Unitless |
Real Number |
The logarithm base 10 of the probability that a bit
is in error (i.e., a zero is transmitted but a one is received).
The BER is the number of bits in error divided by the total number
of bits sent. STK uses table lookup from a .mod file to extract a
BER given an Eb/No. STK interpolates the table as necessary to
determine the appropriate bit error rate for a particular bit
energy level. If the bit energy is smaller than the first value in
the table, the bit error rate for the first value is used. If the
bit energy is larger than the last value in the table, a default
bit error rate of 1.0e-30 is used to indicate no errors. |
| log(BER) Tot. |
Unitless |
Real Number |
The logarithm base 10 of the probability that a bit
is in error (i.e., a zero is transmitted but a one is received)
across all hops of an analog bent pipe communications link or a
digital repeater communications link. The BER is the number of bits
in error divided by the total number of bits sent. STK uses table
lookup from a .mod file to extract a BER given an Eb/No. STK
interpolates the table as necessary to determine the appropriate
bit error rate for a particular bit energy level. If the bit energy
is smaller than the first value in the table, the bit error rate
for the first value is used. If the bit energy is larger than the
last value in the table, a default bit error rate of 1.0e-30 is
used to indicate no errors. |
| Link Margin |
RatioUnit |
Real Number |
The computed value that indicates by how much the
link meets, exceeds, or fails to meet the user’s link budget
requirements. |
| Link Margin Tot. |
RatioUnit |
Real Number |
The computed value that indicates by how much the
total end-to-end link meets, exceeds, or fails to meet the user’s
link budget requirements. If the link is a single hop, this will be
equivalent to the Link Margin. |
| Link Margin Type |
Unitless |
Text |
The user-selected type of link margin being
considered. Included in the data provider for your
convenience. |
| Link Margin
Value |
Unitless |
Real Number |
The user-selected threshold value of the link
margin being considered. Included in the data provider for your
convenience. Note: The dimension of the Link Margin Value depends
on the selected Link Margin Type. The dimensions for the Link
Margin Value are: BER - Unitless, C/N - RatioUnit, C/No -
SpectralDensityUnit, Eb/No - RatioUnit, Flux Density -
PowerFluxDensityUnit, RIP - PowerUnit, and Rcvd Carrier Power -
PowerUnit. |
| Propagation
Delay |
TimeUnit |
Real Number |
The amount of time required for a signal to
propagate through the physical link medium. This will vary
depending on the propagation distance and the type of medium. |
| Propagation
Distance |
DistanceUnit |
Real Number |
The distance of the physical link medium between a
transmitter and a receiver for which a signal will travel. |