Policy on Intellectual Property Right (IPR)
1 Introduction
2 General principle
3 Usable frequency bands
4 The NAVDAT system
4.1 Orthogonal frequency
division multiplexing parameters
4.2 Channel bandwidth
4.3 Modulation
5 Components of the NAVDAT System
6 Propagation channel
6.1 Mode of propagation
for MF frequency band
6.1.1 Surface
wave propagation
6.1.2 Ionospheric
or sky wave propagation
6.2 Mode of propagation in
HF frequency band
6.2.1 Surface wave propagation
6.2.2 Sky wave
propagation
6.2.3 Near
vertical incidence sky wave propagation
7 Transmitter
7.1 Crest factor
7.2 Pre-correction
7.3 NAVDAT transmitter
performances and minimal specifications
7.3.1 Spectral
occupancy of RF signal
8 Transmitting antennas
8.1.1 MF antenna
500 kHz
8.1.2 Top-loaded
antenna
8.1.3 Theoretical calculations
8.1.4 Environmental
resistance
8.1.5 Impedance
matching unit
8.1.6 Artificial
ground plane
8.2 HF transmitting
antenna
8.2.1 Surface
wave propagation
8.2.2 Sky wave propagation
8.2.3 Near
vertical incident sky wave
9 Radio noise
9.1 Noise contribution
9.1.1 Estimated
man-made noise
9.1.2 NOISEDAT
OUTPUT 500 kHz examples
9.1.3 NOISEDAT
OUTPUT 4.2 MHz
9.1.4 NOISEDAT
OUTPUT 500 kHz
9.1.5 NOISEDAT OUTPUT 4.2 MHz
9.2 Fa and En calculations
9.3 Necessary RF field
level at the receive antenna
9.4 Example of observation
in field test
9.4.1 Operation
of the test system
9.4.2 Analysis of monitoring data
10 Receiving system on ships
10.1 The receiving antenna
10.1.1 Field
Antenna E
10.1.2 Field
antenna H
10.2 Environmental
performances of receiving antenna (refer to IEC standard 60945)
10.3 Technical specifications of a typical receiving antenna
10.4 Connection to receiver
11 Receiver
11.1 RF part
11.2 Digital part
11.3 Man – machine
interface
11.4 Sensitivity
11.5 Calculations
11.6 Necessary signal to
noise ratio
11.7 Signal to noise ratio
values used for calculations
11.8 Technical specifications
12 NAVDAT coverage calculations
12.1 Parameters
12.2 Factors affecting bit
error rate
12.3 Predictions coverage
methods
12.3.1 Coverage
calculation according ITU-R M.1467-1
12.3.2 GRWAVE
OUPUT vertical polarization 1 kW radiated power
13 Conclusion