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#!/usr/bin/env python
#
# Copyright 2003,2004,2005 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
import Numeric
import math
import ephem
import time
#
# Simple class for allowing local definition of a calibration function
# for raw samples coming from the RA detector chain. Each observatory
# is different, and rather than hacking up the main code in usrp_ra_receiver
# we define the appropriate function here.
#
# For example, one could calibrate the output in Janskys, rather than
# dB.
#
#
def calib_default_total_power(data):
r = 10.0*math.log10(data)
return(r)
def calib_numogate_ridge_observatory_total_power(data):
me = ephem.Observer()
#
# PyEphem wants lat/long as strings, rather than floats--took me quite
# a long time to figure that out. If they don't arrive as strings,
# the calculations for sidereal time are complete garbage
#
me.long = str(-76.043)
me.lat = str(44.967)
me.date = ephem.now()
sidtime = me.sidereal_time()
foo = time.localtime()
if not "calib_prefix" in globals():
pfx = "./"
else:
pfx = globals()["calib_prefix"]
filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
foo.tm_mon, foo.tm_mday, foo.tm_hour)
rainbow_file = open (filenamestr+".tpdat","a")
r = (data / 409.6)
flt = "%6.3f" % r
#r = calib_default_total_power(data)
inter = globals()["calib_decln"]
rainbow_file.write(str(ephem.hours(sidtime))+" "+flt+" "+str(inter)+"\n")
rainbow_file.close()
return(r)
def calib_numogate_ridge_observatory_fft(data,l):
me = ephem.Observer()
#
# PyEphem wants lat/long as strings, rather than floats--took me quite
# a long time to figure that out. If they don't arrive as strings,
# the calculations for sidereal time are complete garbage
#
me.long = str(-76.043)
me.lat = str(44.967)
me.date = ephem.now()
sidtime = me.sidereal_time()
foo = time.localtime()
if not "calib_prefix" in globals():
pfx = "./"
else:
pfx = globals()["calib_prefix"]
filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
foo.tm_mon, foo.tm_mday, foo.tm_hour)
now = time.time()
if not "calib_then" in globals():
globals()["calib_then"] = now
delta = (l/1024)*5
if (now - globals()["calib_then"]) >= delta:
globals()["calib_then"] = now
rainbow_file = open (filenamestr+".sdat","a")
r = calib_default_fft(data,l)
inter = globals()["calib_decln"]
rainbow_file.write("data:"+str(ephem.hours(sidtime))+" "+str(inter)+" "+str(r)+"\n")
rainbow_file.close()
return(r)
return(data)
def calib_default_fft(db,l):
return(db)
#
# We capture various parameters from the receive chain here, because
# they can affect the calibration equations.
#
#
def calib_set_gain(gain):
globals()["calib_gain_setting"] = gain
def calib_set_integ(integ):
globals()["calib_integ_setting"] = integ
def calib_set_bw(bw):
globals()["calib_bw_setting"] = bw
def calib_set_freq(freq):
globals()["calib_freq_setting"] = freq
def calib_set_avg_alpha(alpha):
globals()["calib_avg_alpha"] = alpha
def calib_set_interesting(inter):
globals()["calib_is_interesting"] = inter
def calib_set_decln(dec):
globals()["calib_decln"] = dec
def calib_set_prefix(pfx):
globals()["calib_prefix"] = pfx
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