Messenger SSR System
Description of the radar set, tactical-technical characteristics
Figure 1: The S-1095 antenna on a marconi-tower
| Specifications | |
|---|---|
| frequency: | 1030 / 1090 MHz |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | |
| pulsewidth (τ): | |
| receive time: | |
| dead time: | |
| peak power: | up to 2 kW |
| average power: | |
| instrumented range: | |
| range resolution: | |
| accuracy: | |
| beamwidth: | |
| hits per scan: | |
| antenna rotation: | |
The S 1095 antenna is a large vertikal aperture antenna of open planar array construction. The antenna can either in be used on its own turning gear and tower, or co-mounted with primary radar antenna and has a gain of 29 dB.
The S 2101 interrogator-responser used in the Messenger- system, is a single rack mounted unit which includes the offboresight azimuth measurement system. The interrogator section uses solid-state devices throughout, including the output stages. The latter are modular in format, each module having a peak power of 500 W. Up to 4 modules may be used in an interrogator, the choice depending upon the required range performance and the length of coaxial cable between the antenna and the interrogator.
The decoder-extractor S 7204 used in Messenger is a hybrid hardware/firmware design whitch not only cannot be overloaded but also provides considerable functional flexibility by use of the bit-slice processing technique. The hardware element provides the basic real-time decoder, the firmware dealing with more complex corrupted replies.
The Messenger has been designed to be easily updated to the full Mode-S system and to fulfil ICAO and STANAG 5017 requirements.