--- title: "GET /udl/passiveradarobservation" method: GET path: "/udl/passiveradarobservation" tags: ["Observation"] --- # GET /udl/passiveradarobservation `GET /udl/passiveradarobservation` ## Request - Base URL: `https://unifieddatalibrary.com` - URL: `https://unifieddatalibrary.com/udl/passiveradarobservation` - Auth: none declared Service operation to dynamically query data by a variety of query parameters not specified in this API documentation. See the queryhelp operation (`/udl//queryhelp`) for more details on valid/required query parameter information. ## Query parameters - `obTime` string, date-time, required - `firstResult` integer - `maxResults` integer ## Response `200` OK - PassiveRadarObservationAbridged[] - `id` string: Unique identifier of the record, auto-generated by the system. - `classificationMarking` string, required: Classification marking of the data in IC/CAPCO Portion-marked format. - `obTime` string, date-time, required: Ob detection time in ISO 8601 UTC with microsecond precision. - `idOnOrbit` string: Unique identifier of the target satellite on-orbit object. This ID can be used to obtain additional information on an OnOrbit object using the 'get by ID' operation (e.g. /udl/onorbit/{id}). For example, the OnOrbit with idOnOrbit = 25544 would be queried as /udl/onorbit/25544. - `satNo` integer: Satellite/Catalog number of the target on-orbit object. - `origObjectId` string: Optional identifier provided by observation source to indicate the target onorbit object of this observation. This may be an internal identifier and not necessarily a valid satellite number. - `idSensor` string: Unique identifier of the reporting surveillance sensor. This ID can be used to obtain additional information on a sensor using the 'get by ID' operation (e.g. /udl/sensor/{id}). For example, the sensor with idSensor = abc would be queried as /udl/sensor/abc. - `origSensorId` string: Optional identifier provided by observation source to indicate the sensor identifier which produced this observation. This may be an internal identifier and not necessarily a valid sensor ID. - `idRFEmitter` string: Unique identifier of the transmitter. This ID can be used to obtain additional information on an RFEmitter using the 'get by ID' operation (e.g. /udl/rfemitter/{id}). For example, the RFEmitter with idRFEmitter = abc would be queried as /udl/rfemitter/abc. - `idSensorRefReceiver` string: Unique identifier of the reference receiver sensor. This ID can be used to obtain additional information on a sensor using the 'get by ID' operation (e.g. /udl/sensor/{id}). For example, the sensor with idSensor = abc would be queried as /udl/sensor/abc. - `extObservationId` string: Optional external observation identifier provided by the source. - `taskId` string: Optional identifier to indicate the specific tasking which produced this observation. - `trackId` string: Unique identifier of a track that represents a tracklet for this observation. - `obPosition` string: The position of this observation within a track (FENCE, FIRST, IN, LAST, SINGLE). This identifier is optional and, if null, no assumption should be made regarding whether other observations may or may not exist to compose a track. - `uct` boolean: Boolean indicating this observation is part of an uncorrelated track or was unable to be correlated to a known object. This flag should only be set to true by data providers after an attempt to correlate to an on-orbit object was made and failed. If unable to correlate, the 'origObjectId' field may be populated with an internal data provider specific identifier. - `azimuth` number, double: Line of sight azimuth angle in degrees and topocentric frame. - `azimuthUnc` number, double: One sigma uncertainty in the line of sight azimuth angle measurement, in degrees. - `azimuthBias` number, double: Sensor azimuth angle bias in degrees. - `azimuthRate` number, double: Rate of change of the line of sight azimuth in degrees per second. - `elevation` number, double: Line of sight elevation in degrees and topocentric frame. - `elevationUnc` number, double: One sigma uncertainty in the line of sight elevation angle measurement, in degrees. - `elevationBias` number, double: Sensor elevation bias in degrees. - `elevationRate` number, double: Rate of change of the line of sight elevation in degrees per second. - `delay` number, double: The time difference, in seconds, between the signal collected at the surveillance site (after being reflected from the target) and the reference site (direct path line-of-sight signal). - `delayUnc` number, double: One sigma uncertainty in the delay measurement, in seconds. - `delayBias` number, double: Delay bias in seconds. - `bistaticRange` number, double: Target bistatic path distance in kilometers. This is the transmitter-to-target-to-surveillance site distance. - `bistaticRangeUnc` number, double: One sigma uncertainty in bistatic range in kilometers. - `bistaticRangeBias` number, double: Sensor bistatic range bias in kilometers. - `bistaticRangeRate` number, double: Rate of change of the bistatic path, in kilometers per second. - `bistaticRangeRateUnc` number, double: One sigma uncertainty in rate of change of the bistatic path, in kilometers per second. - `bistaticRangeAccel` number, double: Bistatic range acceleration, in kilometers per second squared. - `bistaticRangeAccelUnc` number, double: One sigma uncertainty in the bistatic range acceleration measurement, in kilometers per second squared. - `doppler` number, double: Doppler measurement in hertz. - `dopplerUnc` number, double: One sigma uncertainty in the Doppler measurement in hertz. - `coning` number, double: Coning angle in degrees. - `coningUnc` number, double: One sigma uncertainty in the coning angle measurement, in degrees. - `tof` number, double: Time of flight (TOF) in seconds. This is the calculated propagation time from transmitter-to-target-to-surveillance site. - `tofUnc` number, double: One sigma uncertainty in time of flight in seconds. - `tofBias` number, double: The Time of Flight (TOF) bias in seconds. - `accel` number, double: The target Acceleration measurement, in kilometers per second squared, for this observation. - `accelUnc` number, double: The target Acceleration uncertainty measurement, in kilometers per second squared, for this observation. - `ra` number, double: Line of sight right ascension in degrees and J2000 coordinate frame. - `declination` number, double: Line of sight declination angle in degrees and J2000 coordinate frame. - `lat` number, double: WGS-84 target latitude sub-point at observation time (obTime), represented as -90 to 90 degrees (negative values south of equator). - `lon` number, double: WGS-84 target longitude sub-point at observation time (obTime), represented as -180 to 180 degrees (negative values west of Prime Meridian). - `alt` number, double: The target altitude relative to WGS-84 ellipsoid, in kilometers for this observation. - `xvel` number, double: X velocity of target, in kilometers per second, in J2000 coordinate frame. - `yvel` number, double: Y velocity of target, in kilometers per second, in J2000 coordinate frame. - `zvel` number, double: Z velocity of target, in kilometers per second, in J2000 coordinate frame. - `senReferenceFrame` 'J2000' | 'EFG/TDR' | 'ECR/ECEF' | 'TEME' | 'ITRF' | 'GCRF': The reference frame of the observing sensor state. If the senReferenceFrame is null, it is assumed to be J2000. - `senx` number, double: Sensor x position, in kilometers, at obTime (if mobile/onorbit) in the specified senReferenceFrame. If senReferenceFrame is null, then J2000 should be assumed. - `seny` number, double: Sensor y position, in kilometers, at obTime (if mobile/onorbit) in the specified senReferenceFrame. If senReferenceFrame is null, then J2000 should be assumed. - `senz` number, double: Sensor z position, in kilometers, at obTime (if mobile/onorbit) in the specified senReferenceFrame. If senReferenceFrame is null, then J2000 should be assumed. - `rcs` number, double: Radar cross section in meters squared for polarization principal. - `rcsUnc` number, double: One sigma uncertainty in principal polarization Radar Cross Section, in meters squared. - `orthogonalRcs` number, double: Radar cross section, in meters squared, for orthogonal polarization. - `orthogonalRcsUnc` number, double: One sigma uncertainty in orthogonal polarization Radar Cross Section, in meters squared. - `snr` number, double: Signal to noise ratio, in decibels. - `timingBias` number, double: Sensor timing bias in seconds. - `transactionId` string: Optional identifier to track a commercial or marketplace transaction executed to produce this data. - `descriptor` string: Optional source-provided and searchable metadata or descriptor of the data. - `createdAt` string, date-time: Time the row was created in the database, auto-populated by the system. - `createdBy` string: Application user who created the row in the database, auto-populated by the system. - `source` string, required: Source of the data. - `origin` string: Originating system or organization which produced the data, if different from the source. The origin may be different than the source if the source was a mediating system which forwarded the data on behalf of the origin system. If null, the source may be assumed to be the origin. - `origNetwork` string: The originating source network on which this record was created, auto-populated by the system. - `sourceDL` string: The source data library from which this record was received. This could be a remote or tactical UDL or another data library. If null, the record should be assumed to have originated from the primary Enterprise UDL. - `dataMode` 'REAL' | 'TEST' | 'SIMULATED' | 'EXERCISE', required: Indicator of whether the data is REAL, TEST, EXERCISE, or SIMULATED data: REAL: Data collected or produced that pertains to real-world objects, events, and analysis. TEST: Specific datasets used to evaluate compliance with specifications and requirements, and for validating technical, functional, and performance characteristics. EXERCISE: Data pertaining to a government or military exercise. The data may include both real and simulated data. SIMULATED: Synthetic data generated by a model to mimic real-world datasets. - `type` string: Read only enumeration specifying the type of observation (e.g. OPTICAL, RADAR, RF, etc). ## Other responses - `400`: Bad Request - `401`: Invalid/Missing User Credentials - `403`: User Is Not Authorized - `405`: Method Not Allowed - `406`: MediaType Not Accepted by Request Headers - `429`: Rate of Requests Exceeds Allowed Limit - `500`: Internal Server Error ## Changes > 12 revisions in range; 1 could not be searched. - **2026-04-09** `bd17bc53681e`: 4 info - added the optional property `items/senReferenceFrame` to the response with the `200` status - added the optional property `items/senx` to the response with the `200` status - added the optional property `items/seny` to the response with the `200` status - added the optional property `items/senz` to the response with the `200` status - **2025-05-29** `4e1cbc17e814`: 2 info - added the new optional `query` request parameter `firstResult` - added the new optional `query` request parameter `maxResults` - **2025-04-16** `75f764c843a9`: 2 info - api operation id `findAll_88` removed and replaced with `` - the endpoint scheme security `BasicAuth` was removed from the API [Operation history](https://skmtc.dev/bluestaq/apis/unified-data-library-services-api/changes/udl/passiveradarobservation/get.md) --- [API](https://skmtc.dev/bluestaq/apis/unified-data-library-services-api.md) - [All operations](https://skmtc.dev/bluestaq/apis/unified-data-library-services-api/llms.txt) - [OpenAPI document](https://skmtc.dev/bluestaq/apis/unified-data-library-services-api/revisions/bd17bc53681e?raw)