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Report Style: Link Budget - Detailed

This Access report provides the detailed information for a communications link budget. Each line of the report conforms to a single time step (user specified) of the dynamic link. The link budget information flow in each line of the report follows the signal path. The link starts from a transmitter RF source and goes through the modulator, transmitter antenna, propagation through the RF environment, such as atmosphere, rain, fog, atmospheric scintillation, etc. The signal arrives at the receive antenna, passing through cables, low noise amplifies (LNA), and is finally demodulated at the receiver. The report provides the link information such as signal powers, RF propagation losses, environmental noise, and link performance at each stage of the signal propagation. The link performance parameters, C/N, Eb/No, and Bit Error Rate (BER), show the signal status without the presence of any interfering signals as well as under the presence of the interfering (jamming) signals.

Data Provider:Link Information

Type: Time-varying data.

Availability: Reports | Dynamic Displays

Column Listing

Column	Column Name	Element	Type	Dimension	Description
1	Time	Time	Real Number or Text	Date	Time.
2	Xmtr Power	Xmtr Power	Real Number	Power	The RF power output of the transmitter as measured at the input to the antenna. This is a user selectable value.
3	Xmtr Gain	Xmtr Gain	Real Number	Ratio	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.
4	EIRP	EIRP	Real Number	Power	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.
5	Free Space Loss	Free Space Loss	Real Number	Ratio	Loss due to propagation through free space.
6	Atmos Loss	Atmos Loss	Real Number	Ratio	Loss calculated by the selected atmosphere model.
7	Rain Loss	Rain Loss	Real Number	Ratio	Loss calculated by the selected rain model.
8	CloudsFog Loss	CloudsFog Loss	Real Number	Ratio	Loss calculated by the Clouds and Fog model.
9	TropoScintill Loss	TropoScintill Loss	Real Number	Ratio	Loss calculated by the troposphere Scintillation model.
10	Prop Loss	Prop Loss	Real Number	Ratio	The total propagation loss computed across all enabled propagation models.
11	Freq. Doppler Shift	Freq. Doppler Shift	Real Number	Frequency	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.
12	Rcvd. Frequency	Rcvd. Frequency	Real Number	Frequency	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.
13	Rcvd. Iso. Power	Rcvd. Iso. Power	Real Number	Power	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.
14	Flux Density	Flux Density	Real Number	PowerFluxDensity	The power from the desired transmitter crossing a unit area normal to the direction of wave propagation.
15	Rcvr Gain	Rcvr Gain	Real Number	Ratio	Receiver Gain is the antenna gain (in dBi) of the receiver which is dependent on the antenna type used.
16	Tatmos	Tatmos	Real Number	Temperature	Tatmos is the antenna noise temperature component attributed to the gaseous absorption model.
17	Train	Train	Real Number	Temperature	Train is the antenna noise temperature component attributed to the rain model.
18	TcloudsFog	TcloudsFog	Real Number	Temperature	The noise temperature from the Cloud and Fog model.
19	TtropoScintill	TtropoScintill	Real Number	Temperature	The noise temperature from the Troposhperic Scintillation model.
20	Tsun	Tsun	Real Number	Temperature	Tsun is the antenna noise temperature component attributed to the sun.
21	Tearth	Tearth	Real Number	Temperature	Tearth is the antenna noise temperature component attributed to the earth. This is applicable only to receivers not on the ground.
22	Tcosmic	Tcosmic	Real Number	Temperature	Tcosmic is the antenna noise temperature component attributed to the cosmic background. This is applicable only to receivers not on the ground.
23	Tantenna	Tantenna	Real Number	Temperature	Tantenna is the antenna noise temperature which is the sum of all the noise source components.
24	Tequivalent	Tequivalent	Real Number	Temperature	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.
25	g/T	g/T	Real Number	GainTempRatio	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.
26	C/No	C/No	Real Number	SpectralDensity	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).
27	Bandwidth	Bandwidth	Real Number	Bandwidth	Bandwidth is the Receiver Bandwidth.
28	Bandwidth Overlap	Bandwidth Overlap	Real Number	Ratio	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.
29	C/N	C/N	Real Number	Ratio	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.
30	Eb/No	Eb/No	Real Number	Ratio	The energy per bit to noise ratio (Eb/No) where Eb is the energy per bit and No = kT (Boltzmann's constant * system temperature).
31	BER	BER	Real Number	Unitless	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.