Link Information - VOACAP
Provides the user with additional link information Report Elements. These are report elements that pertain to the sky-wave propagation path direction rather than the straight-line path direction. The report elements associated from the transmit antenna through the propagation channel and to the receive antenna should be utilized in typical OTH HF link budgFets reporting (e.g. transmit angles/gains, propagation loss/ranges, receive angles/gains).NOTE: When using the VOACAP model, there are several Link Information Data Provider report elements which are of little importantance. These include Xmtr Azimuth, Xmtr Elevation, Xmtr Gain, Free Space Loss, Rcvr Azimuth, Rcvr Elevation, Rcvr Gain, Range. These are considered "Straight-line path" report elements and are of little use for over the horizon (OTH) analysis.
Rather than using these "straight-line path" report elements in your reports, you can consider using the "Skywave path" versions, which are located below. They are called Transmit Azimuth, Transmit Elevation, Transmit Gain, Skywave Free Space Loss, Receive Azimuth, Receive Elevation, Receive Gain, Skywave Range.
The Link Information Data Provider's report element called Free Space Loss is reported as zero because the Skywave Free Space Loss is included in the calculation of total propagation loss as reported by the PropLoss report element.
Available for these objects: Access
Type: Time-varying data.
Availability: Reports | Graphs | Dynamic Displays | Strip Charts
Data Provider Elements
| Name | Dimension | Type | Description |
|---|---|---|---|
| Time | Date | Real Number or Text | Time step of the simulation |
| Sunspot Number | Unitless | Real Number | The number of sunspots, which you can take from space weather data. |
| Solar Flux | Unitless | Real Number | The solar flux at the location of the vehicle, a measure of the energy impinging the spacecraft from the Sun. The reported value does not consider any eclipsing. |
| Skywave Range | Distance | Real Number | Range of the Skywave signal path |
| VOACAP Loss | Ratio | Real Number | The loss reported by VOACAP (includes freespace loss and antenna gains). |
| Skywave Loss | Ratio | Real Number | propagation loss for the Skywave signal path (doesn’t include FSL) |
| Skywave Free Space Loss | Ratio | Real Number | The free space loss for the range associated with the Skywave signal path. |
| Skywave Prop Delay | SmallTime | Real Number | Propagation delay for the Skywave signal path |
| Skywave Mode | Unitless | Text | The most reliable mode of signal propagation. See MODE for more detail. |
| Reliability | Percent | Real Number | The circuit reliability. |
| Reliable Frequency | Frequency | Real Number | The most reliable frequency |
| Skywave Transmit Elevation | Angle | Real Number or Text | Transmit elevation angle of the Skywave signal path. |
| Skywave Transmit Azimuth | Angle | Real Number or Text | Transmit azimuth angle of the Skywave signal path. |
| Skywave Transmit Gain | Ratio | Real Number | Transmit gain in the Skywave direction. |
| Skywave Receive Elevation | Angle | Real Number or Text | Receive elevation angle of the Skywave signal path. |
| Skywave Receive Azimuth | Angle | Real Number or Text | Receive azimuth angle of the Skywave signal path. |
| Skywave Receive Gain | Ratio | Real Number | Receive antenna gain in the Skywave direction. |
| Skywave Doppler-Primary (Xm-Sky-Rc) | Frequency | Real Number | The Skywave Doppler-Primary shift is the offset in frequency between the transmitted frequency and the received frequency for the signal path from the transmitter, off the ionosphere, and traveling directly to the receiver. This path could include one or more hops. |
| Skywave Doppler-Secondary (Xm-SkyGnd-Rc) | Frequency | Real Number | The Skywave Doppler-Secondary shift is the offset in frequency between the transmitted frequency and the received frequency for the signal path from the transmitter, off the ionosphere, off the ground close to the receiver,and then to the receiver. This path could include one or more hops. |
| FDOA | Frequency | Real Number | Frequency difference of arrival |