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tracking_code.py
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tracking_code.py
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import numpy as np
import dish
import time
import threading
import takespec
import dish_synth
from os import sys
import ephem
#generate lists of pointings in terms of galactic coords
b_list = [-20., -18., -16., -14., -12., -10., -8., -6., -4., -2., 0., 2., 4., 6., 8., 10., 12., 14., 16., 20.]
b_coord = []
l_coord = []
for i in range(20, 160, 8):
l = i
for k in range(0, len(b_list), 1):
b = b_list[k]
b_coord.extend([b])
l_coord.extend([l])
for n in range(200, 230, 8):
m = n
for j in range(0, len(b_list), 1):
b = b_list[j]
b_coord.extend([b])
l_coord.extend([m])
np.savetxt('gal_lat_b.gz', b_coord)
np.savetxt('gal_long_l.gz', l_coord)
#determining alt,az for pointing
def gal_to_eq(b_lat, l_long):
open('alt_list.txt', 'w')
open('az_list.txt', 'w')
R = np.zeros([3,3])
R[0] = [-0.054876, -0.873437, -0.483835]
R[1] = [0.494109, -0.444830, 0.746982]
R[2] = [-0.867666, -0.198076, 0.455984]
trans_R = np.transpose(R)
x = np.zeros([3,480])
x[0] = np.cos(b_lat)*np.cos(l_long)
x[1] = np.cos(b_lat)*np.sin(l_long)
x[2] = np.sin(b_lat)
A = np.dot(trans_R, x)
obs = ephem.Observer()
obs.lat = 37.8732*np.pi/180
obs.long = -122.2573*np.pi/180
obs.date = ephem.now()
lst = obs.sidereal_time()
R_1 = np.zeros([3,3])
R_1[0] = [np.cos(lst), np.sin(lst), 0]
R_1[1] = [np.sin(lst), -1*np.cos(lst), 0]
R_1[2] = [0,0,1]
B = np.dot(R_1, A)
lat = 37.8732*np.pi/180
R_2 = np.zeros([3,3])
R_2[0] = [-1*np.sin(lat), 0, np.cos(lat)]
R_2[1] = [0, -1, 0]
R_2[2] = [np.cos(lat), 0, np.sin(lat)]
C = np.dot(R_2, B)
alt = np.arctan2(C[1], C[0])
az = np.arcsin(C[2])
alt_list = alt*(180/np.pi)
az_list = az*(180/np.pi)
return (az_list,alt_list)
#np.savetxt('alt_list.txt', alt_list)
#np.savetxt('az_list.txt', az_list)
def data_taker():
#update date
date = 'Apr_30'
d = dish.Dish(verbose=True)
s = dish_synth.Synth()
obs = ephem.Observer()
obs.lat = 37.832*np.pi/180
obs.long = -122.2573*np.pi/180
#d.home()
b_lat = np.loadtxt('gal_lat_b.gz')
l_long = np.loadtxt('gal_long_l.gz')
for i in range (0, len(l_long), 1):
#update log name
sys.stdout = open('obs_log_Apr_30_6_to_10pm.txt', 'a')
b = b_lat[i]
l = l_long[i]
#lower LO frequency
s.set_freq(1272.4)
s.set_amp(10.0)
try:
az, alt= gal_to_eq(b_lat[i], l_long[i])
d.point(az, alt, validate=True)
except ValueError:
print 'invalid pointing, skipping point'
continue
#if pointing fails, will move on to the next pointing (go back to for loop)
while True:
try:
d.point(az, alt)
break
except:
print 'Pointing failed, trying again'
while True:
try:
d.noise_off()
break
except:
print "Turning noise off failed, trying again"
obs.date = ephem.now()
LST = obs.sidereal_time()
takespec.takeSpec('spec_low_freq_noise_off_%s_%s_%s_%s.gz' % (b, l, LST, date), numSpec=120)
print 'low freq noise off spectra done, b = %s, l = %s' % (b, l)
while True:
try:
d.noise_on()
break
except:
print "Turning noise on failed, trying again"
obs.date = ephem.now()
LST = obs.sidereal_time()
takespec.takeSpec('spec_low_freq_noise_on_%s_%s_%s_%s.gz' % (b, l, LST, date), numSpec=40)
print 'low freq noise on spectra done, b = %s, l = %s' % (b, l)
#higher LO frequency
s.set_freq(1268.4)
s.set_amp(10.0)
try:
az, alt= gal_to_eq(b_lat[i], l_long[i])
d.point(az, alt,validate=True)
except ValueError:
print "invalid pointing, skipping point"
continue
while True:
try:
d.point(az, alt)
break
except:
print "Pointing failed, trying again"
while True:
try:
d.noise_off()
break
except:
print "Turning noise off failed, trying again"
obs.date = ephem.now()
LST = obs.sidereal_time()
takespec.takeSpec('spec_up_freq_noise_off_%s_%s_%s_%s.gz' % (b, l, LST, date), numSpec=120)
print 'upper lo freq noise off spectra done, b = %s, l = %s' % (b, l)
while True:
try:
d.noise_on()
break
except:
print "Turning noise on failed, trying again"
obs.date = ephem.now()
LST = obs.sidereal_time()
takespec.takeSpec('spec_up_freq_noise_on_%s_%s_%s_%s.gz' % (b, l, LST, date), numSpec=40)
print 'upper lo freq noise on spectra done, b = %s, l = %s' % (b, l)
######
time.sleep(5)
data_taker()
sys.stdout.close()