Products

LOCATE is a suite of integrated products which can be utilised to deploy a complete HF monitoring and SIGINT system, or used individually to replace elements within an existing system.

Sarsen Antenna  

A broadband, omni-directional antenna designed for reception of HF signals between 1-30MHz.

The robust, self-supporting design consists of a combined monopole with crossed loops which provides excellent coverage over the entire upper hemisphere. This passive antenna offers simultaneous reception of vertical, right-handed and left-handed circular polarisations, and has integral matching transformers to permit direct connection to 50Ω systems.

Antenna Control Unit  

The Antenna Control Unit (ACU) provides configuration and calibration of an antenna array.

The polarisation of up to nine Sarsen antennas can be controlled by a single ACU, and a built-in continuous wave source is available for calibration and to transmit a test tone to check the integrity of the equipment in the receive chain. The ACU is fully controlled using TCP/IP over Ethernet and multiple units can be interconnected for larger systems.

MCDWR16  

The MCDWR16 offers multichannel monitoring and combines a maximum of nine DWR16 receivers into a convenient 2U package.

The receivers can be configured to provide up to 36 simultaneous, independently tuned, narrowband frequency channels. Alternatively, Direction Finding (DF) is supported over a maximum of four simultaneous frequency channels. Two MCDWR16 units can be connected together for larger systems.

Windows® based monitor software for control and data analysis is available for both the DWR16 and MCDWR16. Spectrum and waterfall displays of the HF band are available, as well as four Digital Drop Receiver (DDR) spectrums. Tuning and demodulation information can be handed off to the SRDF & E-Copy application in an integrated monitoring and DF system.

DWR16  

The DWR16 offers simultaneous monitoring of four HF channels and periodic snapshots of the full HF spectrum.

The narrowband variant has four 32kHz channels; the wideband variant has a single 2MHz channel with narrowband channels derived in software.

Windows® based monitor software for control and data analysis is available for both the DWR16 and MCDWR16. Spectrum and waterfall displays of the HF band are available, as well as four Digital Drop Receiver (DDR) spectrums. Tuning and demodulation information can be handed off to the SRDF & E-Copy application in an integrated monitoring and DF system.

SRDF & E-copy Software  

SRDF & E-Copy server software interfaces with the MCDWR16 receivers to control their operation in an adaptive array system.

Using the MUSIC super-resolution DF algorithm, the software processes the coherent receiver data to estimate the directions of multiple co-channel signals.

Geolocation Manager Software  

The Geolocation Manager software for Windows® PCs provides command and control of the LOCATE system.

Comprehensive world mapping is provided using the industry standard ESRI ArcGIS libraries. Multiple DF sites are networked using Geolocation Manager so that signal bearings estimated at the different sites can be overlaid on the map. Triangulation techniques are implemented so that signal Position Fixing (PF) is achieved. To help match up signals from the different sites, correlation methods are available to compare the recorded E-Copy data, thus ensuring a correct PF.