def encode(plain_string, base=3):
bit_string = ''.join(
[format(c, 'b').zfill(8) for c in plain_string.encode('utf8')])
# split bit_string into chunks the length of base
chunks = [bit_string[::-1][i:i + 8] for i in range(0, len(bit_string), 8)]
# reverse list of chunks AND every chunk itself.
chunks = [chunk[::-1].zfill(base) for chunk in chunks[::-1]]
result = []
tmp = []
# CRTCode Object is used for error correction
code = CRC.CRTCode([1, 2, 3, 5, 7])
# encode each chunk with error correction
for chunk in chunks:
# Encode with error correction
m = CRC.Message(m_binary=chunk)
code.encode(m)
tmp.extend(code.getVals())
# split bit_string into chunks the length of 3
for x in tmp:
result.append(format(x, '0' + str(base) + 'b'))
assert len(result) == len(tmp)
return result
def findPossibleMessages():
segmentLength = 0.2 #Seconds
f = open("data.bin", "r")
Input = np.fromfile(f, dtype=np.int16)
Input = Input[10**4:]
messageList=[]
for segment in range(0,numSeconds/segmentLength):
print(segment)
InputSegment=Input[2*segmentLength*Fs*segment:2*segmentLength*Fs*(segment+1)]
#Strip out the I and Q
I = InputSegment[0::2].astype(float)
Q = InputSegment[1::2].astype(float)
m = np.sqrt(I**2+Q**2)
messages = PreambleDetection.findPreambles(m,threshold,'8D')
for messageStart in messages:
Time = (acquisitionTime-startTime)+(segment*segmentLength)+messageStart/Fs
bitString,confidenceArray = decodeMessage(m,messageStart)
hexString = CRC.bin2hex(bitString)
if hexString[0:2] == '8D':
messageList.append((Time,hexString))
return(messageList)
def findPossibleMessages():
segmentLength = 0.2 #Seconds
f = open("data.bin", "r")
Input = np.fromfile(f, dtype=np.int16)
Input = Input[10**4:]
messageList = []
for segment in range(0, numSeconds / segmentLength):
print(segment)
InputSegment = Input[2 * segmentLength * Fs * segment:2 *
segmentLength * Fs * (segment + 1)]
#Strip out the I and Q
I = InputSegment[0::2].astype(float)
Q = InputSegment[1::2].astype(float)
m = np.sqrt(I**2 + Q**2)
messages = PreambleDetection.findPreambles(m, threshold, '8D')
for messageStart in messages:
Time = (acquisitionTime -
startTime) + (segment * segmentLength) + messageStart / Fs
bitString, confidenceArray = decodeMessage(m, messageStart)
hexString = CRC.bin2hex(bitString)
if hexString[0:2] == '8D':
messageList.append((Time, hexString))
return (messageList)
def polarcodes(n, rate, snr, channel_con, decode_method, decode_para,
information_pos, frozen_bit, crc_n):
N = 2**n
information_num = int(N * rate)
# 信息-information_bit生成
information_bit = np.random.randint(0, 2, size=(1, information_num))
if crc_n == 0:
pass
else:
informationbit = information_bit.copy()
informationbit.resize(information_num, )
information_bit_list = list(informationbit)
crc_info = CRC.CRC(information_bit_list, crc_n)
crc_information_bit = crc_info.code
crc_information_bit = np.array(crc_information_bit)
crc_information_bit.resize(1, information_num + crc_n)
# 编码前序列-u生成
u = np.ones((1, N)) * frozen_bit
j = 0
#print(u.size)
#print(information_bit.size)
if crc_n == 0:
for i in information_pos:
u[0][i] = information_bit[0][j]
j += 1
else:
for i in information_pos:
u[0][i] = crc_information_bit[0][j]
j += 1
#print(information_pos)
# 生成矩阵-G生成
G = function.generate_matrix(n)
# 编码比特-x生成
x = u * G
x = np.array(x % 2)
# 经过信道生成y
y = function.channel(x, channel_con, snr, rate)
# y进入译码器生成u_d
u_d = decoder.decoder(y, decode_method, decode_para, information_pos,
frozen_bit, channel_con, snr, rate, crc_n)
#print(u_d)
# 计算错误数
information_pos = information_pos[0:information_num]
information_bit_d = u_d[information_pos]
error_num = int(np.sum((information_bit_d + information_bit) % 2))
if error_num != 0:
decode_fail = 1
else:
decode_fail = 0
r_value = np.array([error_num, decode_fail])
return r_value
def scf_decoder(y_llr, information_pos, frozen_bit,decode_para,crc_n):
# 第一次用SC译码的过程
N = y_llr.size
n = int(np.log2(N))
u_d_1_list = sc_decoder(y_llr,information_pos,frozen_bit)
u_d_1_llr=u_d_1_list[1].copy()
u_d_1=u_d_1_list[0].copy()
u_d_1 = np.array([0 if u_d_1[i] == 0 else 1 for i in range(u_d_1.size)])
u_d_1_info=u_d_1[information_pos]
u_d_1_llr_info=u_d_1_llr[information_pos]
#print(u_d_1_llr_info)
u_d_1_info=list(u_d_1_info)
#print(u_d_1)
crc_c = CRC.CRC(u_d_1_info, crc_n)
flag = crc_c.detection()
#print(flag)
flip_info_pos1 = list(np.argsort(np.abs(u_d_1_llr_info)))
flip_info_pos = flip_info_pos1[0:decode_para[0]]
information_pos_array=np.array(information_pos)
flip_pos=information_pos_array[flip_info_pos]
#print(flip_pos)
if flag == 0:
T=1
while T <= decode_para[0]:
#print(T)
u_d_2_list=sc_flip1_decoder(y_llr,information_pos,frozen_bit,flip_pos[T-1])
u_d_2_llr = u_d_2_list[1].copy()
u_d_2 = u_d_2_list[0].copy()
u_d_2 = np.array([0 if u_d_2[i] == 0 else 1 for i in range(u_d_2.size)])
u_d_2_info=u_d_2[information_pos]
u_d_2_info=list(u_d_2_info)
crc_c = CRC.CRC(u_d_2_info, crc_n)
flag1 = crc_c.detection()
if flag1 == 1:
u_d = np.array(u_d_2)
#print('The scf decoder flip: ',T,' times and it works.')
break
else:
T += 1
u_d = np.array(u_d_1)
else:
#print('no flip and success')
u_d=np.array(u_d_1)
return u_d
def process_data(self, Data):
data = ""
for x in Data:
crc = CRC.CRC(x, 4)
for y in crc.code:
if y == 1:
data += "1"
else:
data += "0"
return data
def packet(data, seq, ack_field): ## chunk, seq, '00'
flag = "7E"
seq_string = str(seq)
print("Frame num: ", seq_string)
print("Data: ", data)
crc = CRC.calc_checksum(data)
print(
"Checksum (frame) ", seq_string, ": ", crc
) # when the server does a checksum on this chunk, should yield same result - send ack
data = str(data)
header = flag + "-" + seq_string + "-" + ack_field
trailer = crc + "-" + flag
packet = header + "-" + data + "-" + trailer
return str(packet)
def newFrame(buffer, next_frame_to_send, nBuffered, frame_expected, MAX_SEQ):
from_network_layer(buffer, next_frame_to_send, nBuffered)
# 帧属性
info = buffer[next_frame_to_send] # 待发送的信息
seq = next_frame_to_send # 序列号
ack = (frame_expected + MAX_SEQ) % (MAX_SEQ + 1) # ACK号
print("Cur Seq: ", seq)
print("Cur Ack: ", ack)
crc = CRC.generateCRC(info) # 生成校验和
data = crc.copy() # 整合后的数据
data.insert(0, ack)
data.insert(0, seq)
return data
def encoder(bin_path, out_path, time_lim, width=960, highth=960):
time_lim = int(time_lim)
fra = 10
pixel_size = 20
bin_in = dec2bin(bin_path)
x = len(bin_in)
row_num = int(highth / pixel_size) - 1
col_num = int(width / pixel_size / 8)
y = int(x // (row_num * col_num)) # 生成的图片数
if (y > time_lim * fra):
y = time_lim * fra
for i in range(y):
m = i * row_num * col_num
n = (i + 1) * row_num * col_num
bin_slice = bin_in[m:n]
list_CRC = for_CRC(bin_slice)
crc = CRC.CRC(list_CRC, 32)
#n=crc.code_list
#m=CRC.check(n)
#print(m)
c = form_CRC(crc)
img = np.zeros((highth + 12 * pixel_size, width + 12 * pixel_size),
dtype=np.uint8)
for j in range(row_num):
img[j * pixel_size + 120:(j + 1) * pixel_size + 120,
120:width + 120] = made_row(
bin_slice[j * col_num:(j + 1) * col_num], pixel_size,
width)
img[1060:1080, 120:1080] = c
img[100:1100, 100:120] = 255
img[100:1100, 1080:1100] = 255
img[1080:1100, 100:1100] = 255
img[100:120, 100:1100] = 255
im = Image.fromarray(img)
im.save(str(i) + ".png")
ff = FFmpeg(inputs={'': '-f image2 -r ' + str(fra) + ' -i %d.png'},
outputs={out_path: '-vcodec mpeg4'})
print(ff.cmd)
ff.run()
return y
if ("101010101010" in data) == False:
# not corrupted
isValid = True # valid for the moment - not corrupted
print"Expected sequence number is ", correct_seq, ", got sequence number ", int(ack_seq)
# -- start error-checking the data -- #
if correct_seq != int(ack_seq): # error has occurred - send a nack to request retransmission
isValid = False
print"Incorrect sequence number - the original packet was dropped"
dropped = True
nack_packet = packet.packet(bytes(payload), correct_seq, "01")
connectionSocket.send(bytes(nack_packet)) # NACK
else: # we have the correct sequence num - continue error-checking
print"Correct sequence number"
# print"CRC received: ", crc_recvd
chk = CRC.calc_checksum(bytes(payload))
if chk != crc_recvd:
isValid = False # request a resend
print"CRC fields do not match"
else:
isValid = True
print"CRC correct"
else:
# packet corrupt
print"Corrupt packet!"
isValid = False
if isValid == True: # no errors - ACK frame
ack_packet = packet.packet(bytes(payload), correct_seq, '10')
connectionSocket.send(bytes(ack_packet))
print"Sent the ack frame (",ack_packet ," ) for seq ", correct_seq, " back to the client"
t1 = Time
if msg0 != '' and msg1 != '':
if abs(t0 - t1) < 10:
decodedPositions = decoder.get_position(msg0, msg1, t0, t1)
if decodedPositions != None and len(decodedPositions) > 0:
points.append(decodedPositions)
return (np.asarray(points))
messageCount = 0
print('Generating plane dict')
f = open('Syd.txt', 'r')
planeDict = {}
for line in f:
Time, Message = line[:-1].split(' ')
isvalid = CRC.computeChecksum(Message)
addr = decoder.get_icao_addr(Message)
tc = decoder.get_tc(Message)
if tc >= 9 and tc <= 18:
rawmsg = Message
if isvalid == False:
isvalid, Message = CRC.correctBitError(rawmsg)
'''
if isvalid==False:
isvalid,Message = CRC.correct2BitError(rawmsg)
'''
if isvalid == True:
messageCount += 1
addr = decoder.get_icao_addr(Message)
if addr not in planeDict.keys():
counter += 1
if (counter == wielkoscPakietu): # pakiet po 8 bitow
packets.append(packet) # tworzy liste pakietow
packet = []
counter = 0
if (
len(packet) > 0
): # mozliwe tworzenie pakietow wiekszych niz 8 bitow. po prostu ostatni pakiet, bedzie malutki
packets.append(packet)
# DODANIE BITU PARZYSTOSCI DO KAZDEGO Z PAKIETOW
tmr = TMR()
hamming = Hamming()
crc = CRC()
parity = ParityBit()
channel = Channel(prawdopodobienstwoBSC, channelS0, channelS1, channelP01,
channelP10)
# print(packets)
packetsWithParityBit = []
for pack in packets:
pack = tmr.codeTMR(pack) # DODANIE TMR
pack = parity.addParityBit(pack) # DODANIE PARITY BIT
# pack = hamming.codeHamming(pack) # DODANIE Hamminga
# pack = crc.addCRC(pack) # DODANIE CRC
packetsWithParityBit.append(pack)
# print(packetsWithParityBit)
event = event.decode("utf-8")
event = [int(x) for x in list(event)] # 类型转换
event = delHeadTail(event) # 去掉头尾
curSeq = event[0]
curACK = event[1]
curInfo = event[2:]
print("Frame expected:", frame_expected)
print("Got Seq: ", curSeq)
print("Got Ack: ", curACK)
print('{:10}\t{}'.format("Receive frame:", event))
if frameLost == False:
# 验证CRC
if CRC.verifyCRC(curInfo.copy()) == False: # CRC 错误
print("Frame CRC error")
else: # CRC 正确
if curSeq == frame_expected: # 接收到对应的帧
frame_expected = inc(frame_expected)
while between(ack_expected, curACK, next_frame_to_send):
nBuffered -= 1
timer[ack_expected] = 0 # 停止已接收帧的计时
ack_expected = inc(ack_expected)
print("Timer:", t[0], t[1], t[2], t[3], t[4], t[5], t[6], t[7])
cnt += 1
# 循环结束
if cnt == 21:
def bp_decoder(y_llr,information_pos,frozen_bit,decode_para,crc_n):
N = y_llr.size
n = int(np.log2(N))
if decode_para[1] == 'max_iter':
bp_max_iter=int(decode_para[0])
#初始化左传播和右传播矩阵
left_matrix=np.zeros([N,n+1])
right_matrix=np.zeros([N,n+1])
left_matrix[:,n]=y_llr
temp_value=(1-2*frozen_bit)*np.infty
temp=[temp_value if i not in information_pos else 0 for i in range(N)]
right_matrix[:,0]=temp
for iter in range(bp_max_iter):
for i in range(n):
left_matrix[:,n-i-1]=function.bp_update_left(left_matrix[:,n-i],right_matrix[:,n-i-1],n-i)
for i in range(n):
right_matrix[:,i+1]=function.bp_update_right(left_matrix[:,i+1],right_matrix[:,i],i+1)
u_d_llr=left_matrix[:,0]+right_matrix[:,0]
u_d=[0 if u_d_llr[i] >= 0 else 1 for i in range(N)]
u_d=np.array(u_d)
elif decode_para[1] == 'g_matrix':
# 初始化左传播和右传播矩阵
left_matrix = np.zeros([N, n + 1])
right_matrix = np.zeros([N, n + 1])
left_matrix[:, n] = y_llr
temp_value = (1 - 2 * frozen_bit) * np.infty
temp = [temp_value if i not in information_pos else 0 for i in range(N)]
right_matrix[:, 0] = temp
flag=0
iter_num=1
while flag == 0 and iter_num <= decode_para[0]:
for i in range(n):
left_matrix[:, n - i - 1] = function.bp_update_left(left_matrix[:, n - i], right_matrix[:, n - i - 1],n - i)
for i in range(n):
right_matrix[:, i + 1] = function.bp_update_right(left_matrix[:, i + 1], right_matrix[:, i], i + 1)
u_d_llr = left_matrix[:, 0] + right_matrix[:, 0]
u_d = [0 if u_d_llr[i] >= 0 else 1 for i in range(N)]
x_d_llr = left_matrix[:, n] + right_matrix[:, n]
x_d = [0 if x_d_llr[i] >= 0 else 1 for i in range(N)]
G = function.generate_matrix(n)
x_g = u_d * G
x_g = np.array(x_g % 2)
#print(x_g)
cor = [0 if x_g[0][i]==x_d[i] else 1 for i in range(N)]
if sum(cor) == 0:
flag = 1
else:
flag = 0
iter_num += 1
u_d = np.array(u_d)
elif decode_para[1] == 'crc_es':
# 初始化左传播和右传播矩阵
left_matrix = np.zeros([N, n + 1])
right_matrix = np.zeros([N, n + 1])
left_matrix[:, n] = y_llr
temp_value = (1 - 2 * frozen_bit) * np.infty
temp = [temp_value if i not in information_pos else 0 for i in range(N)]
right_matrix[:, 0] = temp
flag = 0
iter_num = 1
while flag == 0 and iter_num <= decode_para[0]:
for i in range(n):
left_matrix[:, n - i - 1] = function.bp_update_left(left_matrix[:, n - i], right_matrix[:, n - i - 1],n - i)
for i in range(n):
right_matrix[:, i + 1] = function.bp_update_right(left_matrix[:, i + 1], right_matrix[:, i], i + 1)
u_d_llr = left_matrix[:, 0] + right_matrix[:, 0]
u_d = np.array([0 if u_d_llr[i] >= 0 else 1 for i in range(N)])
u_d_info = u_d[information_pos]
u_d_info = list(u_d_info)
crc_c=CRC.CRC(u_d_info,crc_n)
flag=crc_c.detection()
# if flag == 1:
# print('It work!',iter_num)
iter_num += 1
u_d = np.array(u_d)
else:
print('This is not a early stopping method of BP decoder or s have not added it to the endecoder.bp_decoder !')
quit()
return u_d
def scl_decoder(y_llr, information_pos, frozen_bit, decode_para, crc_n):
N = y_llr.size
n = int(np.log2(N))
llr_matrix = np.ones((n + 1, N))
llr_matrix[llr_matrix == 1] = float('nan')
bit_matrix = llr_matrix.copy()
llr_matrix[0] = y_llr
list_max= decode_para[0]
pm_method=decode_para[1]
split_pos=information_pos #采用传统的方法，在所有信息位分裂，未裁剪和减复杂度
llr_list = [llr_matrix]
bit_list = [bit_matrix]
#print(llr_list)
#print(bit_list)
pm_list = [0]
split_loc=0
split_len=len(split_pos)
l_now=1
while split_len-1 >= split_loc:
for i in range(l_now):
llr_matrix_temp = llr_list[i]
bit_matrix_temp = bit_list[i]
pm_temp = pm_list[i]
matrix_temp = sc_stepping_decoder(llr_matrix_temp, bit_matrix_temp, information_pos, frozen_bit,
split_pos[split_loc])
llr_list[i] = matrix_temp[0]
bit_list[i] = matrix_temp[1]
right_pm_update = function.get_pm_update(
matrix_temp[0][n][split_pos[split_loc - 1] + 1:split_pos[split_loc] + 1],
matrix_temp[1][n][split_pos[split_loc - 1] + 1:split_pos[split_loc] + 1], pm_method)
pm_list[i] = pm_temp + right_pm_update
llr_list.append(matrix_temp[0].copy())
bit_matrix_wrong = matrix_temp[1].copy()
bit_matrix_wrong[n][split_pos[split_loc]] = 1 - bit_matrix_wrong[n][split_pos[split_loc]]
bit_list.append(bit_matrix_wrong.copy())
wrong_pm_update = function.get_pm_update(
matrix_temp[0][n][split_pos[split_loc - 1] + 1:split_pos[split_loc] + 1],
bit_matrix_wrong[n][split_pos[split_loc - 1] + 1:split_pos[split_loc] + 1], pm_method)
pm_list.append(pm_temp + wrong_pm_update)
if l_now > list_max/2:
pm_list_arg=np.argsort(pm_list)
del_list_arg=pm_list_arg[list_max:]
#删减多余的列表分支
pm_list = [pm_list[i] for i in range(len(pm_list)) if i not in del_list_arg]
llr_list = [llr_list[i] for i in range(len(llr_list)) if i not in del_list_arg]
bit_list = [bit_list[i] for i in range(len(bit_list)) if i not in del_list_arg]
l_now = len(pm_list)
split_loc += 1
if split_pos[-1] != N-1:
for i in range(l_now):
llr_matrix_temp = llr_list[i]
bit_matrix_temp = bit_list[i]
pm_temp = pm_list[i]
matrix_temp = sc_stepping_decoder(llr_matrix_temp, bit_matrix_temp, information_pos, frozen_bit,N-1)
llr_list[i] = matrix_temp[0]
bit_list[i] = matrix_temp[1]
right_pm_update = function.get_pm_update(
matrix_temp[0][n][split_pos[split_loc - 1]+1:N],
matrix_temp[1][n][split_pos[split_loc - 1]+1:N], pm_method)
pm_list[i] = pm_temp + right_pm_update
#接下来提取list中的译码值经过crc校验,采取的是排序pm，从最小的开始经过CRC，第一个通过CRC的即作为译码值输出
pm_argsort=np.argsort(pm_list)
for i in pm_argsort:
u_d_temp=bit_list[i][n]
u_d_temp = np.array([0 if u_d_temp[i] == 0 else 1 for i in range(u_d_temp.size)])
u_d_temp_info = u_d_temp[information_pos]
u_d_temp_info = list(u_d_temp_info)
crc_c = CRC.CRC(u_d_temp_info, crc_n)
flag = crc_c.detection()
if flag == 1:
u_d=u_d_temp
break
elif flag == 0 and i == pm_argsort[-1]:
u_d_temp=bit_list[pm_argsort[0]][n]
u_d_temp = np.array([0 if u_d_temp[i] == 0 else 1 for i in range(u_d_temp.size)])
u_d=u_d_temp
return u_d
def decoder(video_path,
bin_path,
error_path,
highth=960,
width=960,
row_num=6,
col_num=47):
ff = FFmpeg(inputs={video_path: None}, outputs={'': '%d.png'})
print(ff.cmd)
ff.run()
k = 2
while (1 == 1):
image_dire = str(k) + ".png"
if cut(image_dire) == 0:
k = k + 1
else:
a = np.zeros((col_num, row_num), dtype=np.uint8)
image = cv2.imread(image_dire, 0)
v_pixel_size = image.shape[0] // col_num
h_pixel_size = image.shape[1] // (row_num * 8)
re_image = cv2.resize(image, (highth, width))
#print(re_image.shape)
cccc = list()
for i in range(col_num):
for j in range(row_num):
a[i][j], strr = arr2byte(
re_image[i * 20:(i + 1) * 20, j * 160:(j + 1) * 160],
20, 20)
cccc.append(strr)
#print(a.shape)
ccccc = for_CRC(cccc)
cccc = arr2CRC(re_image[940:960, 0:960])
for g in cccc:
ccccc.append(g)
flag = CRC.check(ccccc)
if flag == 0:
with open(error_path, 'ab') as f:
a3 = np.zeros((col_num, row_num), dtype=np.uint8)
a3[0:col_num, 0:row_num] = 255
f.write(a3)
else:
with open(error_path, 'ab') as f:
a4 = np.zeros((col_num, row_num), dtype=np.uint8)
a4[0:col_num, 0:row_num] = 0
f.write(a4)
with open(bin_path, 'ab') as f:
f.write(a)
break
k = k + 5
z = 0
while (1):
image_dir = str(k + 6 * z) + ".png"
#print(image_dir)
image_dir_next = str(k + 6 * z + 6) + ".png"
d = is_same_frame(image_dir, image_dir_next)
if (d == 1):
break
cut(image_dir)
#print(image_dir)
a = np.zeros((col_num, row_num), dtype=np.uint8)
image = cv2.imread(image_dir, 0)
v_pixel_size = image.shape[0] // col_num
h_pixel_size = image.shape[1] // (row_num * 8)
re_image = cv2.resize(image, (highth, width))
ccc = list()
for i in range(col_num):
for j in range(row_num):
a[i][j], strr = arr2byte(
re_image[i * 20:(i + 1) * 20, j * 160:(j + 1) * 160], 20,
20)
ccc.append(strr)
#print(a.shape)
cc = for_CRC(ccc)
ccc = arr2CRC(re_image[940:960, 0:960])
for g in ccc:
cc.append(g)
flag = CRC.check(cc)
if flag == 0:
with open(error_path, 'ab') as f:
a1 = np.zeros((col_num, row_num), dtype=np.uint8)
a1[0:col_num, 0:row_num] = 255
f.write(a1)
else:
with open(error_path, 'ab') as f:
a2 = np.zeros((col_num, row_num), dtype=np.uint8)
a2[0:col_num, 0:row_num] = 0
f.write(a2)
with open(bin_path, 'ab') as f:
f.write(a)
z = z + 1
msg1=msg
t1=Time
if msg0!='' and msg1!='':
if abs(t0-t1)<10:
decodedPositions = decoder.get_position(msg0, msg1, t0, t1)
if decodedPositions != None and len(decodedPositions)>0:
points.append(decodedPositions)
return(np.asarray(points))
messageCount=0
print('Generating plane dict')
f = open('Syd.txt','r')
planeDict={}
for line in f:
Time,Message = line[:-1].split(' ')
isvalid = CRC.computeChecksum(Message)
addr = decoder.get_icao_addr(Message)
tc = decoder.get_tc(Message)
if tc>=9 and tc<=18:
rawmsg=Message
if isvalid==False:
isvalid,Message = CRC.correctBitError(rawmsg)
'''
if isvalid==False:
isvalid,Message = CRC.correct2BitError(rawmsg)
'''
if isvalid==True:
messageCount+=1
addr = decoder.get_icao_addr(Message)
