Phase instability of ionospheric propagation and its influence on HF Doppler radar remote sensing
Abstract
Theoretical and experimental progress toward operational use of decametric radar in an ionospherically propagated mode to obtain sea state and surface wind data is reviewed. Estimates are made of the expected Doppler radar contamination from data gained during the JASIN experiment involving one hop CW transmissions into the sporadic E layer. Shipboard propagation and receiving were found to yield data accurate to the degree of sea surface roughness. Further tests during the MARSEN trials, which featured a 5 MHz for multihop F-mode propagation from the emitter 700 km to an area where the sea truth was known, and then on to a land platform. A one-hop mode displayed a Doppler spread of 10 dB at the 0.05-0.1 Hz. Theoretical consideration of the problem indicated radar sea-echo spectra Doppler spreads of 0.1 Hz rms, acceptable for deducing wave-height spectra. Statistical analyses with a larger data base is recommended.
- Publication:
-
2nd International Conference on Antennas and Propagation
- Pub Date:
- 1981
- Bibcode:
- 1981icap.conf..249S
- Keywords:
-
- Doppler Radar;
- Ionospheric Propagation;
- Multipath Transmission;
- Phase Deviation;
- Radar Echoes;
- Sea States;
- Continuous Wave Radar;
- Decametric Waves;
- Doppler Effect;
- High Frequencies;
- Pulse Doppler Radar;
- Radar Scanning;
- Radar Transmission;
- Remote Sensing;
- Communications and Radar