Some new experimental research of HF backscatter propagation in CRIRP

This paper describes some new experimental research of HF backscatter propagation in CRIRP. This new experimental research includes the detecting of a target with two different polarization arrays using the Faraday rotation effects, the detecting of the HF Doppler spectrum of sea and land by an HF backscatter propagation experimental system (HF BPES) in CRIRP. Airplanes as far away as 2000 km are frequently successfully detected by the HF BPES with two different polarization arrays. The track points of the airplane were compared with that detected by VHF radar, and the difference of the two tracks is very small so that the square root difference is /spl sigma/=13 km. The illuminated range by HF BPES is from land, by land, the sea boundary, and the sea over a long distance. The HF Doppler spectrum of ground, the sea echo Doppler spectrum and the HF Doppler spectrum of sea boundary and land are probed. It indicates the identification of both sea and ground.