.2 Cal.Sig.Freq Data type: Unsigned fixed-point .3 Cal.Sig.Ampl Data type: Float .4 Reserved (for future use) Table A5: Calibration metadata parameters description Name Content Meas. Unit: Cal.Last.Cal.Date The time stamp of the last calibration. It is denoted as a basic reference time value. Seconds since midnight (UTC) of January 1, 1970 absolute time. s Cal.Self.Cal.Flag This is set to “1” if the sensor performs a periodical self-calibration procedure. Otherwise it is set to “0” if the self-calibration is performed after a user request. ----- Cal.Sig.Freq Frequency of the internal calibration source. If the SD is not equipped with an internal calibration source this parameter is set to the default value 0. Hz Cal.Sig.Ampl Amplitude of the internal calibration source. If the SD is not equipped with an internal calibration source this parameter is set to the default value 0. dB SDR Metadata SDR metadata contains information about SD computing hardware specifications as given by the manufacturer. The definition of each parameters and the related unit of measurements are reported in table A6. Metadata name: SDR Meas. Unit: -------- Data type: Cluster ID: 006 Size: Variable Desc.: List of SDR parameters according to manufacturer specifications. .0 SDR.Manufacturer Data type: String .1 SDR.Model Data type: String .2 SDR.Firmware Data type: String .3 Reserved (for future use) Table A6: SDR metadata parameters description Name Content Meas. Unit: SDR.Manufacturer SD manufacturer ----- SDR.Model SD model ----- SDR.Firmware Current firmware version ----- Host Metadata Host metadata contains information about the host controller of the SD. The host controller can be included in SD hardware or cab an external device that control and drives the sensor. The definition of each parameters and the related unit of measurements are reported in table A7. Metadata name: Host Meas. Unit: -------- Data type: Cluster
Metadata name: Timestamp Meas. Unit: s, s Data type: Cluster ID: 013 Size: 2 Desc.: It is the time instant in which the SD has completed the acquisition. It is denoted as a basic reference time value. Seconds since midnight (UTC) of January 1, 1970. .0 Timestamp.s Data type: Unsigned integer .1 Timestamp.us Data type: Unsigned integer Scanned Time This metadata denotes the amount of time that the SD has employed to perform the sensing operation in a channel or set of channels. Metadata name: Scan.Time Meas. Unit: ms Data type: Unsigned fixed-point ID: 014 Size: 1 Desc.: It denotes the amount of time that the SD has employed to perform the sensing operation in a channel or set of channels. Range (min/resolution/max) 0 ms 1 ms (232–1) ms Data Typology This metadata denotes the description of the received data domain. Metadata name: Data.Typology Meas. Unit: -------- Data type: Enumeration ID: 015 Size: 1 Desc.: Unique identification of the possible data typology of the received data. Enumerator I/Q.Time Value: 0 Enumerator FFT Value: 1 Enumerator PSD Value: 2 Enumerator I/Q.Freq Value: 3 Enumerator Time.sample Value: 4 Enumerator Occupied Value: 5 Note: FFT stands for Fast Fourier Transform and PSD stands for Power Spectral Density. I/Q.Time and I/Q.Freq denote the I/Q sample in time domain and the spectrum of the I/Q component, respectively. Time.sample is the acquired signal and occupied is used if the output is Boolean variable (the SD has scanned only one channel) or an array of Boolean variables (the SD has scanned more than one channel). “1” means that the scanned channel is occupied “0” otherwise. Sensing Technique It denotes the sensing technique currently adopted by the SD. Metadata name: Sens.Algorithm Meas. Unit: -------- Data type: Enumeration ID: 016 Size: 1 Desc.: Unique identification of the sensing technique currently adopted by the SD. Enumerator Cyclostationarity Value: 0 Enumerator Energy.detection Value: 1
Enumerator Custom Value: 2 Priority Priority denotes the scheduling scheme used for incoming request. Metadata name: Priority Meas. Unit: -------- Data type: Enumeration ID: 017 Size: 1 Desc.: Unique identification of the priority criterium currently employed by the SD. Enumerator FCFS Value: 0 Enumerator RR Value: 1 Enumerator Custom Value: 2 Note: FCFS stands for First Come First Served and RR stands for Round Robin. Timing Timing metadata denotes how the SD currently manages the sensing request that it receives. Metadata name: Timing Meas. Unit: -------- Data type: Enumeration ID: 018 Size: 1 Desc.: Unique identification of the timing criterium currently employed by the SD. Enumerator On.Demand Value: 0 Enumerator Timed.with.periodicity Value: 1 Compression Compression metadata denotes the compression algorithm used in order to reduce the amount of data to transmit. Metadata name: Compression Meas. Unit: -------- Data type: Enumeration ID: 019 Size: 1 Desc.: Unique identification of the compression algorithm used by the SD in order to reduce the amount of data to transmit. Enumerator LZ Value: 0 Enumerator DEFLATE Value: 1 Note: LZ is the Lempel-Ziv compression method. Format Format metadata denotes data transmission format used for data transmission by the SD. Metadata name: Format Meas. Unit: -------- Data type: Enumeration ID: 020 Size: 1 Desc.: Unique identification of the data transmission format used for data transmission by the SD. Enumerator Little.Endian Value: 0 Enumerator Big.Endian Value: 1