Hi all, I'm doing a simple RF recording with a B200mini synchronized to an accurate GPS 1PPS. I'm attempting to determine which samples(most importantly the first one) fall on a 1PPS pulse. I'm using the File Meta Sink block in GRC to try and extract information from the recording. When I read the data from the header, here is what is shown:
fileName: 'X:\XXXXX.dat' ifileName: 'X:\XXXXX.idx' ioType: 'r' totalPulseCount: 11 sampleCount: 1000000 startTime: [0 0.1120] timestamp0: '1970-01-01 00:00:00.112' rx_rate: 1000000 rx_time: [0 0.1120] timestamp: '1970-01-01 00:00:00.112' rx_freq: 500000000 sampleType: 'float' typeFlag: 'double' vBit: 1 impediance: 50 samples: [] So, this is a 1 MSps recording with a center frequency at 500MHz and about 11 seconds in length, so the extracted information is definitely correct. But a couple of questions from the metadata: The "startTime" value is 0.1120. I realize that this is the time stamp of the first sample of the segment. However, does that mean that sample 112000 (1MSps*0.1120) is the first sample that falls on a PPS since the B200mini is synced to it? Second, the "samples" field is empty. I was attempting to populate it with sample numbers that fall on a 1PPS or a header. If the header is synchronized to the 1PPS, this will be fairly easy. If not, is there a way to determine which samples fall on the PPS? Thanks, Michael
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