Direction Finding Systems
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Direction Finding Systems Directions Finding (DF) Systems for all Search & Rescue (SAR) Missions SAR Requirements The location of persons in distress needs to be quickly and accurately determined in order to maximise the chance of rescue success regardless of the prevailing conditions or the theatre of operation. Despite the improvements made in the COSPAS/SARSAT system, Search and Rescue crews on-board aircraft still rely on Direction Finding (DF) equipment to guide them in the last miles of the search, and indeed for much greater distances should the survivor not have a GNSS-based beacon. The Solution: The 935- Series of Tactical Direction Finders provide a range of integrated solutions for bus-controlled (1553B) and stand-alone direction finding systems in both SAR and CSAR environments. The 938- Series of Civil Direction Finders provide solutions for SARonly requirements. The DFs in both families include an integral synthesised receiver (covering 30-470MHz for the 935series, and 88-470MHz for the 938 series), together with five Guard receivers to monitor pre-defined distress frequencies. Bearings are taken on all six receivers simultaneously. Data decoding is provided for COSPASSARSAT messages and for marine DSC messages via the associated Guard receivers. Stand-alone installations typically control the DF via RS422 using a Chelton-supplied CDU, but the commandinterface protocol is available for customers to interface their own control interface as required. The Chelton range of DF equipment utilises DSP (software defined) receiver technology and is designed for both military and civil use. The members of the DF family provide single box solutions, COSPAS/SARSAT compliant and compatible with the requirements of the Global Maritime Distress and Safety System (GMDSS). Chelton Limited has a policy of continuous development and stress that the information provided is a guide only and does not constitute an offer or contract or part thereof. Whilst every effort is made to ensure the accuracy of the information contained in this Data Sheet, no responsibility can be accepted for any errors or omissions. The copyright of antenna designs and images is copyright protected and owned by Chelton Limited. ©Chelton Limited. The Chelton Centre, Fourth Avenue, Marlow, Buckinghamshire, SL7 1TF, UK T: +44 (0)1628 472072 E: info@chelton.com W: chelton.com

Direction Finding Systems Directions Finding (DF) Systems for all Search & Rescue (SAR) Missions Combat SAR (CSAR): In Military applications, the DF is required to interface to a CSAR beacon interrogator that initiates transmission from the rescue beacon in order to facilitate covert rescue. The Chelton 935 DF is designed to interface to suitable interrogators and to be able to take bearings in the brief period of beacon response. CSAR beacon compatibility is available for typical beacons including PRC112G, PRC434 and URX3000. Civil SAR To respond to customers wishing to deploy DFs on civil...

Direction Finding Systems Directions Finding (DF) Systems for all Search & Rescue (SAR) Missions 935/938 Stand Alone SAR Solution 935/938 Stand Alone SAR Solution Chelton Dedicated CDU (715-40/718-40) Chelton Dedicated CDU (715-40/718-40) RS422 ARINC 429 ARINC 429 Bearing Frequency SARSAT Data Bearing Frequency ARINC Data SARSAT 407 ARINC 407 (Not in 938) AR Chelton 935/938 Series DF Chelton 935/938 Series DF MIL-BUS SAR Solution Available 935 CSAR Stand Alone Solution Chelton Dedicated CDU (CH935) Interrogator UHF Antenna ARINC 429 Bearing Frequency SARSAT Data CSAR Interrogator MIL-BUS...

Direction Finding Systems Directions Finding (DF) Systems for all Search & Rescue (SAR) Missions CONFIGURATION CAPABILITY * With associated CSAR Interrogator The Chelton Centre, Fourth Avenue, Marlo' Buckinghamshire, SL7 1TF, UK T: +44 (0)1628 472072 E: info@chelton.coml W:chelton.com Chelton Limited has a policy of continuous development and stress that the information provided is a guide only and does not constitute an offer or contract or part thereof. Whilst every effort is made to ensure the accuracy of the information contained in this Data Sheet, no responsibility can be accepted for...