Data for NTIA Technical Memorandum TM-23-566

Examining the Effects of Resolution Bandwidth when Measuring Compound Radar Waveforms

Description

The data associated with NTIA TM-23-566 is contained in this repository. The data directories follow a format similar to the report with individual directories for the P0N, Q3N, and compound test cases. Each of these directories contains the measured spectrum data contained in the "Stepped" files and a folder containing all of the figures used in the Tech Memo. The data can be accessed by clicking the link under Releases on the right side of the Github repository page.

Data Files

P0N.zip

Data file P0N.zip contains 9 .mat files named WaveformXSteppedfileYY.mat where X is 1-9 corresponding to the Waveform Number column in Table 1 in TM-23-566 and YY is the sequential file number for files in this data set. P0N.zip also contains 3 .mat files corresponding to the equal power, unequal power, and rise/fall time measurements. P0N.zip contains a "Report Figs" folder with the figures produced from these .mat files used in TM-23-566.

Q3N.zip

Data file Q3N.zip contains 9 .mat files named WaveformXXSteppedfileYY.mat where XX is 10-18 corresponding to the Waveform Number column in Table 3 in TM-23-566 and YY is the sequential file number for files in this data set. Q3N.zip also contains 4 .mat files corresponding to the equal power and unequal power measurements where either the pulse width or chirp bandwidth were varied. Q3N.zip contains the filder "Report Figs" which contains the figures produced from these .mat files used in TM-23-566.

CompoundWfms19to30.zip CompoundWfms31-40.zip CompoundWfms41to50.zip

These .zip files contain the .mat files named WaveformXXSteppedfileYY.mat where XX is the 19-50 corresponding to the Waveform Number column in Table 5 in TM-23-566 and YY is the sequential file number for files in this data set. Some .mat files have _Rat1, _Rat100, or __Rat1000 inserted in the file name and correspond to waveforms where the P0N:Q3N ratio was either 1:1, 1:100, or 1:1000. These .zip files also contain "Report Figs" folders containing the figures produced from these .mat files used in TM-23-566.

Data Format

Stepped Measurement Files

The spectrum data is contained in Matlab files (.mat) that each contain the waveform number and the word 'Stepped' in the filename. The additional tests that were not given a waveform name will have text in the filename indicating which test case was associated with that file. Each RBW was collected as an "event" in the Stepped measurement file so there are a total of 12 "events" for each test case. A description of the Stepped measurement algoritm is provided in NTIA Technical Report 05-420.

The .mat files may be loaded into Matlab via the command:

Matlab load('path\to\file\filename.mat') % Windows Matlab load('path/to/file/filename.mat') % Mac/Linux

The variables contained within the measurement files follow this format: 1. CalPathandFileName: provides the directory and filename for the calibration file used to apply calibration corrections to the saved data as a single string. 1. Will be empty (‘ ‘) if calibration corrections were not applied to the data. 2. Ex. ‘C:\temp\Calfile1.mat’.

1. Comments: contains comments entered by the user using the edit menu in the Stepped measurement.

2. CompleteMeasMessage: String indicating how the measurement arrived at completion. There are three possibilities:

   1. ‘The measurement completed successfully’ – indicates that it ran and completed normally.
   2. ‘The measurement stopped prematurely due to error’ – indicates that a severe error occurred which required the measurement to stop.
      1. Data may not be saved properly.
      2. Most predictable errors are handled seamlessly by the measurement software, but some, such as instrument communication failures, can’t be dealt with.
   3. ‘The measurement was stopped prematurely by user’ – indicates that the user stopped the measurement before it was complete.
      1. All data up to the time the measurement was stopped will be saved however, there may be some preallocated variables that won’t contain information regarding sweeps that never got completed.

3. ErrorLog: (# of errors)x(2) cell array containing information regarding errors that occurred during the measurement.

   1. First column: MException object of the error, which contains a lot of information regarding the error.
   2. Second column: time and date stamp from the RSMS-5G computer indicating when the error occurred.

4. event: struct containing all of the data collected for each measurement event as specified in the event table. Each of the 12 events in the file is associated with a different resolution bandwidth.

   | Event # | Bandwidth | |:-------:|:---------:| |1 | 100 Hz | |2 | 300 Hz | |3 | 1 kHz | |4 | 3 kHz | |5 | 10 kHz | |6 | 30 kHz | |7 | 100 kHz | |8 | 300 kHz | |9 | 1 MHz | |10 | 3 MHz | |11 | 6 MHz | |12 | 8 MHz |

   1. Data for each event is indexed as such: event(<event number>).<Field Name>

      1. Fields:

         1. ManualAttenEnabled: vector of Booleans indicating whether or not the measurement was in manual attenuation mode or not for each corresponding step.
            1. This can be changed while an event is running so this keeps track.
         2. MeasNotes: a string containing the text entered into the measurement notes edit text box in the Stepped measurement GUI while the measurement was running.
         3. FreqMHz: the frequency vector, in MHz, for the specified event.
         4. UnCorrectedMagdBm: raw data, in dBm, without primary preselector or spectrum analyzer attenuation accounted for.
         5. AttenCorrectedMagdBm: data, in dBm, that has been corrected for primary preselector or spectrum analyzer attenuation level.
         6. ExceptionPoints: vector of Booleans that indicate whether or not a specific step had an error.
            1. Errors can be caused by zero-dynamic range problem (measurement unable to determine proper attenuation level) or overloads when no more attenuation is available or measurement is in manual attenuation mode.
         7. Atten: vector containing the primary preselector or spectrum analyzer attenuation used for each point, in dB.
         8. CompletionTime: time and date stamp from RSMS-5G computer indicating when the event completed.
         9. RawMagTraceMatrix: Contains a matrix of all the spectrum analyzer sweeps used to create the overall stepped measurement spectrum.
         10. CalCorrectedMag: data that has been corrected for primary preselector or spectrum analyzer attenuation level and calibration system gain data.

         11. PulseParamTraceData: struct containing data taken when the pulse parameter feature is used. It will be empty, [], if pulse data is not taken.

             1. Fields:

             2. If the measurement is unable to determine any of these fields, the affected field will contain the empty set, [].

5. EventParamIdx: struct with fields containing indices into EventTableData for each of its parameters.

   | Field | Index | |:---------------|------:| | fStartMHz | 1 | | fStopMHz | 2 | | RBWMHz | 3 | | VBWMHz | 4 | | Det | 5 | | SweepTimems | 6 | | NumPoints | 7 | | PreampOn | 8 | | AutoSteps | 9 | | NumSteps | 10 | | Presel1AntPort | 11 | | Presel1Path | 12 | | Presel2AntPort | 13 | | Presel2Path | 14 | | Presel2Atten | 15 |

6. EventTableData: (# events)x(10) cell array containing all the information in the event table of the Swept measurement.

   1. Row: event number (1-12).
   2. Columns follow this format:
      | Column # | Value | |:--------:|:-------------------------------------------------------------------------------------------------------| | 1 | start frequency (MHz) | | 2 | stop frequency (MHz) | | 3 | resolution bandwidth (MHz) | | 4 | video bandwidth (MHz) | | 5 | spectrum analyzer detector | | 6 | sweep time (ms) | | 7 | number of sweep points | | 8 | preamp state | | 9 | Auto steps state (when checked, the number of steps is automatically calculated from the span and RBW) | | 10 | number of steps | | 11 | primary preselector antenna port | | 12 | primary preselector filter type | | 13 | secondary preselector antenna port | | 14 | secondary preselector filter type | | 15 | secondary preselector static attenuation level |

7. FileNumber: a number assigned by the measurement to this saved data file (determined based on other existing Stepped data files in the same directory).

8. HardwareConfig: struct containing instrument IDs of all the connected instruments. Unused instrument fields will contain the string ‘None’. | Field | Description | |:-----------|:----------------------| | SpecAn | spectrum analyzer | | Presel1 | primary preselector | | Presel2 | secondary preselector | | YIGTracker | YIG tracker |

9. MeasStartTime: a string containing the time and date (from computer) that the measurement was started (ex. 05-Apr-2013 17:54:42).

10. MeasType: string indicating the type of measurement, ‘Stepped’.

11. NumEvents: number of events run by the measurement.

Sponsor

This report and associated data were sponsored by the NTIA Office of Spectrum Management (OSM). https://www.ntia.doc.gov/office/office-spectrum-management-osm.

References

• NTIA Technical Memorandum 23-566
• NTIA Technical Report 05-420

Contact

For questions, contact Geoff Sanders, (720) 552-7567, gesanders@ntia.gov