ITS Propagation Data Measurements - Phase 2 Data
FTP
ftp://flattop.its.bldrdoc.gov/propdata/phase_2/
access raw Phase 2 propagation measurements from FTP directories.
PHASE_2 data are spot measurements using frequencies that emphasize
the UHF band (300-3000MHz) and environments that emphasize irregular terrain.
One feature is that many of the paths appear in pairs:
- Open - mobile terminal has a clear, unobstructed foreground in the direction of the other terminal.
- Concealed - mobile terminal is immediately behind a grove of trees or a building.
- Alternate - the Alternate path, if one exists.
For each of the five measurement sets there are three data files:
- xxpars.txt - provides values for the pertinent parameters of the measurement system.
- xxpath.txt - gives coordinates of both terminals together with computed distance between them.
- xxdata.txt - provides the corresponding measured values.
- They are given as the observed "attenuation relative to
free space" (also called the "excess path loss"). If a space is
blank (or .0000) there was no corresponding measurement--often because of
equipment failure. If the signal was below system sensitivity
there is a different indication. The maximum attenuation that
would have been observable (less 5 dB to make a conservative
estimate) is computed, and then the value used is that computed
attenuation plus the number 500. For example, the value 560
means that the corresponding attenuation was unobservable but was
evidently greater than 60 dB.
The following data exists:
- McQuate, P. L., J. M. Harman, and A. P. Barsis (1968),
- Tabulations of propagation data over irregular terrain ...,
- Part I: Gunbarrel Hill receiver site, ESSA Tech. Report ERL 65-ITS 58.
- McQuate, P. L., J. M. Harman, M. E. Johnson, and A. P. Barsis (1968),
- Tabulations of propagation data over irregular terrain ...,
- Part II: Fritz Peak receiver site, ESSA Tech. Report ERL 65-ITS 58-2.
- McQuate, P. L., J. M. Harman, M. E. McClanahan, and A. P. Barsis (1970),
- Tabulations of propagation data over irregular terrain ...,
- Part III: North Table Mountain--Golden, ESSA Tech. Report ERL 65-ITS 58-3.
- McQuate, P. L., J. M. Harman, and M. E. McClanahan (1971),
- Tabulations of propagation data over irregular terrain ...,
- Part IV: Receiver site in grove of trees, OT/TRER 19.
- Hufford, G. A., and F. K. Steele (1991),
- Tabulations of propagation data over irregular terrain ...,
- Part V: Virginia, NTIA Report 91-282.