The SBS-2M is a multilateration system that consists of 4 or more SBS-2M units and a target processing unit. Each SBS-2M unit is based around a 19" rack-mounted professional 1090 MHz Mode-A/C/S and ADS-B receiver with remote antenna modules that capture transmissions from transponder equipped aircraft and derives positional data based on Time Difference of Arrival (TDOA). Multilateration allows you to triangulate on the position of any Mode-A/C/S aircraft. Ideal for non-radar airfields and large inhospitable areas or as a backup system for SSR, the SBS-2M provides cost-effective situational awareness.

The SBS-2M can be purchased with a 1030MHz receiver, dual-redundancy package and full maintenance services. The units can also be integrated into our P.U.M.A.S. systems (Portable Unit for Multilateration Awareness System) for placement in all-terrain environments.

The SBS-2M is designed to be used with OEM software applications but a special version of the Basestation software called Obelix is available designed specifically for the SBS-2M.

To download the SBS-2M Product Specification click here

The SBS-2M comprises of the professional SBS-2 chassis system in a network configuration, with the option of remote external antenna modules connected to the host by radio, microwave or fibre optic links. The SBS-2M can be configured for Terminal Area or Wide Area Multilateration Surveillance.

Each receiver processes Mode A/C and Mode-S SSR replies (on 1090 MHz), and Mode-S squitter transmissions, including extended squitter messages (ADS-B). Each receiver module decodes and timestamps the transponder reply signals and squitter messages it receives, before transmitting the data to the SBS-2M Target Processor (TP). The advanced target processing software then compares the reports from the various receiver modules to derive target positions based on Time Difference of Arrival (TDOA) of the signal at the different antennas.

Additional decoded data available from Mode S / ADS-B transmissions includes:

Precise UTC date and time signal was received (using GPS synchronisation)

Date/Time of last position update

Signal strength

Navigational Uncertainty Category (NUC)

24-bit aircraft address

Aircraft ID

Mode-S download format (DF)

Aircraft Category

Position report derived from aircraft?s on board navigation system

Mode 3/A 4096 code (Squawk)

Altitude reported (Flight level)

Squitter status

Altitude AMSL (calculated using pressure sensor)

Transponder capability

Horizontal and Vertical velocity

Single antenna flag (SAF)

Selected Altitude/Heading

Surveillance status (SPI, alert)

Mode A/C signals provide timestamp and signal strength plus Mode A 4096 code or Mode C altitude data, together with the multilaterated position information.

The SBS-2M TP is housed in a 19" card frame unit with auto-ranging power supply, touch screen, keyboard, mouse and front panel annunciators. The unit can be connected to a host system via Ethernet and provides a range of possible outputs including raw Mode A/C, Mode S and ADS-B data, processed aircraft data and a CAT 20 and 21 compliant data stream. There are number of user-selectable options at order time and the SBS-2M is fully retro-gradable. The SBS-2M TP is highly versatile in deployment and configuration and allows full access to real-time Mode-A/C/S and ADS-B data for processing, or logging of the data to hard disk for later retrieval.

SBS-2M Customisation is available.

Click here for technical specifications.