Improve bin file reading logic
parent
fe6e4fd120
commit
0342f65f87
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@ -60,7 +60,6 @@ def main():
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# Parse input arguments
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parser = argparse.ArgumentParser(description="rfplot: plot RF observations", formatter_class=argparse.ArgumentDefaultsHelpFormatter)
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parser.add_argument("-p", "--path", help="Input path to parent directory /a/b/", type=str)
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parser.add_argument("-P", "--prefix", help="Filename prefix c in c_??????.bin", type=str)
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parser.add_argument("-s", "--start", type=int, default=0, help="Number of starting subintegration")
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parser.add_argument("-l", "--length", type=int, default=3600, help="Number of subintegrations to plot")
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parser.add_argument("-C", "--site", type=int, help="Site ID", default=4171)
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@ -84,11 +83,9 @@ def main():
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if not os.path.exists(args.catalog):
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print(f"TLE catalog not available under {args.catalog}")
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print(site, args.freqlist, args.catalog)
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# Read spectrogram
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if args.artifact is None:
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s = Spectrogram(args.path, args.prefix, args.start, args.length, args.site)
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s = Spectrogram(args.path, args.start, args.length, args.site)
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timestamps = [ x.replace(tzinfo=utc) for x in s.t]
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range_rate_base = [ 0 for x in timestamps]
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site_location = wgs84.latlon(site["lat"], site["lon"], site["height"])
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51
strf/rfio.py
51
strf/rfio.py
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@ -1,6 +1,8 @@
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#!/usr/bin/env python3
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import os
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import re
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import sys
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import glob
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import numpy as np
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@ -9,11 +11,27 @@ from datetime import datetime, timedelta
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class Spectrogram:
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"""Spectrogram class"""
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def __init__(self, path, prefix, ifile, nsub, siteid):
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def __init__(self, froot, ifile, nsub, siteid):
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"""Define a spectrogram"""
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path, prefix = extract_path_and_prefix(froot)
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# Read first file to get number of channels
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# Read matching filenames
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fnames = sorted(glob.glob(os.path.join(path, f"{prefix}_*.bin")))
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# Start filename
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fname = os.path.join(path, f"{prefix}_{ifile:06d}.bin")
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if not fname in fnames:
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# Exit on no matching files
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if fnames == []:
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print(f"Spectrogram is not available under {fname}")
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sys.exit(1)
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else:
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print(f"Spectrogram is not available under {fname}\nUsing {fnames[0]} instead")
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fname = fnames[0]
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ifile = int(fname.split("_")[1].replace(".bin", ""))
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# Read first header
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with open(fname, "rb") as fp:
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header = parse_header(fp.read(256))
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@ -29,12 +47,22 @@ class Spectrogram:
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while isub<nsub:
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# File name of file
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fname = os.path.join(path, f"{prefix}_{ifile:06d}.bin")
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# Exit on absent file
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if not os.path.exists(fname):
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break
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print(f"Opened {fname}")
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with open(fname, "rb") as fp:
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next_header = fp.read(256)
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while next_header:
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header = parse_header(next_header)
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t.append(header["utc_start"] + timedelta(seconds=0.5 * header["length"]))
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zs.append(np.fromfile(fp, dtype=np.float32, count=nchan))
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z = np.fromfile(fp, dtype=np.float32, count=nchan)
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# Break on incomplete spectrum
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if len(z) != nchan:
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break
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zs.append(z)
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next_header = fp.read(256)
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isub += 1
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ifile += 1
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@ -43,11 +71,28 @@ class Spectrogram:
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self.t = t
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self.freq = freq
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self.fcen = freq_cen
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self.bw = bw
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self.siteid = siteid
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self.nchan = self.z.shape[0]
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self.nsub = self.z.shape[1]
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print(f"Read spectrogram\n{self.nchan} channels, {self.nsub} subints\nFrequency: {self.fcen * 1e-6:g} MHz\nBandwidth: {self.bw * 1e-6:g} MHz")
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def extract_path_and_prefix(fname):
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basename, dirname = os.path.basename(fname), os.path.dirname(fname)
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pattern_with_extension = "_\d{6}.bin$"
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pattern_without_extension = "_\d{6}$"
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if re.findall(pattern_with_extension, basename):
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prefix, _ = re.split(pattern_with_extension, basename)
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elif re.findall(pattern_without_extension, basename):
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prefix, _ = re.split(pattern_without_extension, basename)
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else:
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prefix = basename
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return dirname, prefix
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def parse_header(header_b):
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header_s = header_b.decode('ASCII').strip('\x00')
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regex = r"^HEADER\nUTC_START (.*)\nFREQ (.*) Hz\nBW (.*) Hz\nLENGTH (.*) s\nNCHAN (.*)\nNSUB (.*)\nEND\n$"
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