TIÊU CHUẨN CHO PHẢN XẠ RADAR
PERFORMANCE STANDARDS FOR SEARCH AND RESCUE RADAR TRANSPONDERS
MSC.510(105)
1 INTRODUCTION
The search and rescue radar transponder (radar SART) carried on ships to meet the requirements of SOLAS regulations IV/7.2.1 or 7.3.1, in addition to meeting the requirements of the relevant ITU-R Recommendations and the general requirements set out in resolution A.694(17), should comply with the following performance standards.
2 GENERAL
2.1 The radar SART should be capable of indicating the location of a unit in distress on the assisting units’ radars by means of a series of 12 equally spaced dots.
2.2 The radar SART should: .1 be capable of being easily activated by unskilled personnel; .2 be fitted with means to prevent inadvertent activation; .3 be equipped with a means which is either visual or audible, or both visual and audible, to indicate correct operation and to alert survivors to the fact that a radar has triggered the radar SART; .4 be capable of manual activation and deactivation; provision for automatic activation may be included;* .5 be provided with an indication of the standby condition; .6 be capable of withstanding without damage drops from a height of 20 m into water; .7 be watertight at a depth of 10 m for at least 5 min; .8 maintain watertightness when subjected to a thermal shock of 45°C under specified conditions of immersion; .9 be capable of floating if it is not an integral part of the survival craft; .10 be equipped with a buoyant lanyard, suitable for use as a tether, if it is capable of floating; .11 not be unduly affected by seawater or oil; .12 be resistant to deterioration in prolonged exposure to sunlight;
.13 be of a highly visible yellow/orange colour on all surfaces where this will assist detection; .14 have a smooth external construction to avoid damaging the survival craft; and .15 be provided with a pole or other arrangement compatible with the antenna pocket in a survival craft in order to comply with paragraph 2.5, together with illustrated instructions. 2.3 The radar SART should have sufficient battery capacity to operate in the standby condition for 96 h and, in addition, following the standby period, to provide transponder transmissions for 8 h when being continuously interrogated with a pulse repetition frequency of 1 kHz.
2.4 The radar SART should be so designed as to be able to operate under ambient temperatures of -20°C to +55°C. It should not be damaged in stowage throughout the temperature range of -30°C to +65°C.
2.5 The height of the installed radar SART antenna should be at least 1 m above sea level.
2.6 The vertical polar diagram of the antenna and hydrodynamic characteristics of the device should permit the radar SART to respond to search radars under heavy swell conditions. The polar diagram of the antenna should be substantially omnidirectional in the horizontal plane. Horizontal polarization or circular polarization should be used for transmission and reception.
2.7 The radar SART should operate correctly when interrogated at a distance of up to at least five nautical miles by a navigational radar using unmodulated pulses and complying with resolutions MSC.192(79), A.477(XII) and A.222(VII), with an antenna height of 15 m above sea level. It should also operate correctly when interrogated at a distance of up to 30 nautical miles by an airborne radar with at least 10 kW peak output power at a height of 3,000 ft above sea level.
3 TECHNICAL CHARACTERISTICS
Technical characteristics of the radar SART should be in accordance with Recommendation ITU-R M.628.
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