GPS World, April 2011

COVER STORY GNSS DESIGN Future Wave 30 L1C Signal Performance and Receiver Design The new GPS L1C signal will be broadcast by the Block III satellites with first launches as early as 2014 L1C innovations significantly enhance PNT performance as well as interoperability with other GNSS signals The authors describe the benefits of its new features and how best to make use of each one By Thomas A Stansell Kenneth W Hudnut and Richard G Keegan OPINIONS DEPARTMENTS Out in Front 6 Dual Use Single Front By Alan Cameron EXPERT ADVICE OCX 8 The Next Gen GPS Ground Control System Interview with Robert Canty Raytheon VP and program manager for GPS OCX THE SYSTEM 12 First Overload Interference Desensitization to GPS Receivers Systems and Networks Report to FCC WAAS Official Again EGNOS SOL Operational Russian SBAS Satellite Passes Transponder Tests Save Our GPS Coalition Forms THE BUSINESS 18 Location Apps Popular in Japan Quakes Wake Trimble to Acquire OmniSTAR Assets SSTLs European GNSS Payload Passes Design Review NovAtel Updates Firmware Topcon GR 5 a Rugged Package in Compact Size Events more TRANSPORTATION Tamper Resistance 37 Security Considerations for GNSS Receivers Modern GNSS will provide in both civil and government domains access control to the signal through spreading code encryption and or authentication at the navigation data level This will require support within the receiver for secure cryptographic keys and the implementation of security functions This article reviews vulnerabilities of these security functions and reviews design considerations to mitigate these attacks By Oscar Pozzobon Chris Wullems and Marco Detratti April 2011 VOL 22 NUMBER 4 gpsworld com INNOVATION GLONASS 42 Developing Strategies for the Future A team of authors from Russian Space Systems a key developer of navigation and geospatial technologies in the Russian aerospace industry describes the new L3 CDMA signal to be broadcast by GLONASS K satellites and the progress to date in developing the SDCM augmentation system By Yuri Urlichich Valeriy Subbotin Grigory Stupak Vyacheslav Alexander Povalyaev and Sergey Karutin ON THE EDGE Application Challenge Making Peace 50 Surveyors GPS Device Serves as Mediator in Kenyan Land Dispute By Noah Kertich heslav Dvorkin n www gpsworld com April 2011 GPS World 3