Operational Data Sharing (ODS)
Operational data sharing is enabling dynamic spectrum sharing with satellite networks. In an effort to mitigate radio frequency interference of radio telescopes on Earth from satellites that beam RF toward Earth, this service provides information about current and near-future observations of participating radio telescopes, such as where their antennas are pointing and at what frequencies they are observing. Satellite operators can dynamically query for this information in order to reconfigure any satellites that may interfere with the observations.
Response
200 Successful Operation – Returns array of JSON objects with these attributes:
| Attribute | Type | Format | Example | Description |
|---|---|---|---|---|
| site_id | string | Wf | Identifier of the observatory/instrument. For Westford, this would be “Wf”. | |
| site_lat_deg | number | decimal-degrees +/– DDD.D | 42.61294894 | the latitude of the observatory/instrument |
| site_lon_deg | number | decimal-degrees +/– DDD.D | –71.49379705 | the longitude of the observatory/instrument |
| site_el_m | number | decimal-meters | 86.765 | the elevation of the observatory/instrument |
| src_id | string | J1056+7011 | identifier of source/target observed during time interval | |
| src_is_pulsar_bool | boolean | false | true = src is a pulsar, false = src is not a pulsar | |
| corr_integ_time_sec | number | decimal-seconds | 3 | correlator integration time in seconds (if ‘src_is_pulsar_bool’=false) |
| src_ra_j2000_deg | number | decimal-degrees | 70.88181332916666 | right ascension of the source/target |
| src_dec_j2000_deg | number | decimal-degrees | 34.68518446944444 | declination of the source/target |
| src_radius | number | decimal-degrees | 0.0034 | radius of beam around the source/target |
| src_start_utc | date-time | 2023-08-16T15:23:47.000541 | start time of this observing interval | |
| src_end_utc | date-time | 2023-08-16T15:26:16.000723 | end time of this observing interval | |
| slew_sec | number | decimal-seconds | 130.8 | the time taken for the array to reach the source (counted from ‘src_start_utc’) |
| trk_rate_dec_deg_per_sec | number | decimal-degrees per second | 0 | declination tracking rate of src (if not sidereal) |
| trk_rate_ra_deg_per_sec | number | decimal-degrees per second | 0 | right ascension tracking rate of src (if not sidereal) |
| freq_lower_hz | number | decimal-Hz | 2000000000 | lower limit frequency used during this interval |
| freq_upper_hz | number | decimal-Hz | 14000000000 | upper limit frequency used during this interval |
| notes | string | inAdv:True | notes that add context to the data |
Error Responses
- 404 Resource Not Available
- 500 Internal Server Error
Contact: Chester Ruszczyk
Acknowledgments
The National Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
The ODS system was developed by NRAO with support from National Science Foundation’s SII NRDZ: Dynamic Protection and Spectrum Monitoring for Radio Observatories (AST- 2232159) and SWIFT-SAT (AST-2332422) grants. This work is a collaboration with NSF, NRAO, SETI, HCRO, UC-Berkeley and CU-Boulder with the support of the NSF Hat Creek Radio Observatory National Radio Dynamic Zone (HCRO-NRDZ) project, NSF award #2139964; and the NSF SII-NRDZ: Radio Astronomy Dynamic Satellite Interference-Mitigation and Spectrum Sharing (RADYSISS) project, NSF award #2232368.
The work at MIT Haystack Observatory was partially supported under NASA contract 80GSFC20C0078.