The HAL-3 airborne navigation radar

This correspondence describes the HAL-3 navigation radar which was designed specially for civil airplanes. The main technical functions of the radar have been extensively tested on Boeing 707 and Y-7A airplanes to the military standard on aeronautic airborne facilities. The test results (1985) are qualified by the Chinese Appraisal Committee of Aeronautics Facilities. The technical specifications of the radar are similar to those of the RDR-1F radar manufactured in the U.S. with several added operational functions. The radar includes 7 units: antenna, transceiver, servo unit, control box, two display units and power supply. Operational principles and functions of each unit are described briefly. The current research project for interfacing the radar to a fibre-optic gyroscope is in process and some initial experimental results are described.