LAD Loran LRS IIID

Autonomous operation
Simultaneous 9-chain (40 station) monitoring
Quantitative signal parameters
Complete PC interface/control
12 automatic interference cancellers
Software selectable clock and monitoring outputs
Accepts 1, 5, or 10 MHz Cesium clock input
46 cm (18”) antenna
High-performance OCXO

Locus’ LRS IIID is the most sophisticated Loran monitoring receiver in the world, and was specially designed to meet USCG specifications. It can track over 40 stations simultaneously, and replaces as many as five other monitoring receivers. The U.S. and Canadian Coast Guards use LRS IIID to monitor and control and North American Loran transmissions. LRS IIIDs have also been recently installed by the Japanese Coast Guard.

The LRS IIID is a computerized automatic receiver incorporating digital signal processing (DSP) technology. This greatly enhances its monitoring performance, including local phase code interval (LPCI) resolution. The LRS IIID receives and processes Loran-C data into both Time of Arrival and Time Differences. The LRS IIID has complete PC interface and control to support remote data acquisition, operation and diagnostics. Manual controls are eliminated, increasing reliability.

Antenna
The low profile (~18”) of Locus’ patented LRS IIID active antenna and preamp with integral band-pass filter does not limit its sensitivity or performance. In fact, its RF immunity is 500% better than that of non-tuned preamps. The LRS IIID antenna includes an automatic 36dB attenuation that allows it to operate in close proximity to Loran-C transmitters.

Modern Receiver Technology
LAD receiver technology offers a 3 dB S/N advantage over hard limited receivers. Extensive quantitative signal parameters are available to the user. The patented ensemble-averaging architecture provides rapid cycle detection and is virtually immune to cycle slip. Acquisition time is 10 times faster than conventional receivers.

The LRS IIID offers true multichain acquisition and tracking (9 chains/40 stations), and crossrate lockout with ensemble averaging improves signal-to-noise 15 dB. ECD and position stability are also significantly improved versus legacy receivers.

Locus' proprietary notch filter technology eliminates notch filter effects on ECD, SNR and sky waves. They are full band automatic notch filters with software override.

Inputs and Outputs
The LRS IIID includes a high-performance OCXO and accepts external clock inputs. It provides analog outputs of the Loran-C signal before (Raw RF) and after (Scope) notch filters and gain, as well as oscilloscope trigger and tracking outputs.

The LRS IIID System
The LRS IIID system includes the LRS IIID receiver, the LRS IIID antenna, one end-user software license, external lightning protection, antenna cable and user documentation.

Applications
· Loran-C monitoring and control systems
· Precise time and frequency reference (Cs synchronized)
· Aviation, marine and terrestrial navigation

Technical Specifications Table