1991 Volume 1991 Issue 67 Pages 69-78
This paper describes the principle of the experimental ranging system and the result of the ranging experiment using the ETS-V. The ranging system uses multiplexed burst signals of sinusoidal tone and data with 0.5 sec duration. The distance between the ETS-V and ships is obtained by measuring the phase delay of the sinusoidal tone for fine ranging and the time delay of the data for ambiguity resolution in the ranging equipment.
The ranging experiment was carried out on the South China Sea and the Indian Ocean in 1989. Satellite elevation angles in these areas were 45° and 14°, respectively. The ranging accuracy of less than 50m rms could be obtained for the C/No of more than 42 dBHz and the characteristics of the ranging accuracy showed the degradation of about 2.5 dB in C/No compared with the theoretical value. The signal acquisition time of less than 193.3 msec could be obtained for the C/No of more than 42 dBHz at both elevation angles, but it varied widely for the C/No of less than 44 dBHz due to multipath fading when the elevation angle is 14°.
