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MCRDS Data Format. May 3, 2006. File Type Header. Data file type 32 byte string (“Data-MCRDS”) terminated with null character ‘\0’. Characters after termination undefined. 2 bytes unsigned short representing year 1 byte unsigned character representing subyear version 5 bytes reserved.

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file type header
File Type Header
  • Data file type
    • 32 byte string (“Data-MCRDS”) terminated with null character ‘\0’. Characters after termination undefined.
    • 2 bytes unsigned short representing year
    • 1 byte unsigned character representing subyear version
    • 5 bytes reserved
data header block
Data Header Block

struct HeaderBlock

{

int dataType;

double sampFreq; % 120 MHz

int prfCount; % PRF = 1/(prfCount*1e-7)

int numAve; % # of hardware integrations (i.e. coherent averages)

int rxAtten[8][2][4];

int rxBlank[8][1][4];

char calModeEn; % always false

char numWaveforms;

char pad[2]; % reserved

int calNumOfPnts; % not used during data collection

double calStartFreq; % not used during data collection

double calStopFreq; % not used during data collection

double calDelay; % not used during data collection

double calDuration; % not used during data collection

};

fields of interest rx mode
Fields of interest: Rx mode
  • rxAtten and rxBlank
    • Each of the eight receivers are loaded with 4 different modes. The modes for each receiver are independent of one another.
      • E.g. mode 1 for receiver 2 can be different than mode 1 for receiver 3.
    • A mode is defined by the settings of the two digital step attenuators and the blank delay line selection.
      • The receiver has a single blanking switch, but two different control lines that can be selected.
    • During any given pulse period, all receivers must be in the same mode number.
      • I.e. the radar does not allow receiver 2 to be in mode 1 while receiver 3 is in mode 2.
fields of interest waveforms
Fields of interest: Waveforms
  • The radar system transmits a set of waveforms defined by the radar operator.
  • The radar loads this sequence of waveforms into the system. For example:
    • 3 us linear FM chirp, radar mode 0
      • Receiver gain settings are set to allow capture of the surface echo and both transmit amplifiers are enabled.
    • 10 us linear FM chirp, radar mode 1
      • Receiver gain settings set to maximize dynamic range while keeping the lowest noise figure possible and satisfying our A2D dithering req. Transmit antenna one enabled.
    • 10 us linear FM chirp, radar mode 2
      • Receiver gain settings set to maximize dynamic range while keeping the lowest noise figure possible and satisfying our A2D dithering req. Transmit antenna five enabled.
  • When the radar is enabled, each of the waveforms and radar modes is run in sequence.
    • E.g. With three waveforms the effective PRF of an individual waveform becomes PRF/3
waveform headers part of data header block
Waveform Headers (part of data header block)
  • struct WaveformHeaderBlock
  • {
  • double startFreq; % 20 MHz (USB mixing with 120 MHz LO to 140 MHz)
  • double stopFreq; % 40 MHz (USB mixing with 120 MHz LO to 160 MHz)
  • double pulseDuration; % arbitrary (but most likely 1 us, 3 us or 10 us)
  • double calFreq; % 0 (disabled during data collection)
  • double calDelay; % unused
  • double calDuration; % unused
  • char bandSelect; % 0 for 150 MHz band, 1 for 450 MHz band
  • char zeroPiMod; % 0 for no modulation, 1 for zero-pi modulation
  • char txMult; % unused
  • char rxMode; % 0, 1, 2, or 3
  • char txAmpEn[2]; % [0] control tx amp 0, [1] controls tx amp 1
  • char pad[2];
  • int mod0Count; % transmitter blanking control line
  • int mod1Count; % transmit amplifier blanking control line
  • int numSam[4]; % number of samples for each DAQ to capture (4 daqs, each with 2 channels)
  • int sampleDelayCount[4]; % delay for DAQ begins capturing
  • char recordEn[8]; % per channel record enable
  • int recordDelay[8]; % per channel recording window start sample
  • int recordNumSam[8]; % per channel recording number of samples
  • int blankDelay0Count; % receiver blank control line 0
  • int blankDelay1Count; % receiver blank control line 1
  • };
  • COUNTS ARE DEFINED AS 10 MHz clock cycles (0.1 us) and are relative to the AWG trigger. The transmit waveform is delayed by 1 us. Therefore “zero-time” has a count of 10.
awg block
AWG Block
  • For predistortion and non-ideal linear FM chirps
    • We are not using this data block for May 06.
data block
Data Block
  • 4 byte integer for data type (data type is 2 for data blocks)
  • 8 bytes for computer time stamp
    • 4 bytes for seconds since epoch (Jan 1, 1970)
    • 4 bytes for microseconds
  • 8 bytes for radar time (free-running 10 MHz counter on the radar board)
    • Used to precisely synchronize to the 1 pps provided by the Wallop’s Flight Facility group.
  • 4 bytes for DAQ errors
    • 1 byte per DAQ
    • Byte is zero when there is no error
    • Most common error is a FIFO error which causes a reset of the FIFOs and a few dropped records
  • Binary data follows (2 byte unsigned samples)
    • 12 bit DAQ, 64 integrations = 18 bits
    • 2 bits dropped = 16 bit sample
overview
Overview

File Type

Data Header

Data Block 0

Datatype (=2)

Waveform 0

Sample 0

Computer Time

Data Block 1

Waveform 1

Sample 1

Radar Time

Data Block 2

Waveform 2

Sample 2

DAQ Error Bytes

DAQ 0

DAQ 1

DAQ 2

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