�1����
Introduction������
������� 1.1����
Daily
meteorological operations������
������� 1.2����
Monitoring
climate change��
������� 1.3����
Defence
use�����������
������� 1.4����
Other
users
�2����
Characteristics
of radiosonde operation����
�3����
Radio-frequency
spectrum used in WMO operations��������
������� 3.1����
Results
from WMO survey
������� 3.2����
Radio-frequency
spectrum occupied in Europe�������
������� 3.3����
Radio-frequency
spectrum occupied in the United States of America����������
�4����
Operational
requirements�
�5����
Future
trends����
������� 5.1����
Very
strong upper winds����
������� 5.2����
Manpower
efficiency resulting from highly automated systems���������
������� 5.3����
Low
radiosonde cost���������
������� 5.4����
Independence
from international NAVAID systems
��� ����5.5����
Possible
improvements to spectrum occupation from improved radiosondes
�6����
Radiocommunication
characteristics of current radiosonde systems�����������
������� 6.1����
Transmitter
characteristics��
������� 6.2����
Ranging
signal��������
������� 6.3����
Receiving
antennas���� �����