Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
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Inside Unmanned Systems
Thought Leadership Series
Thinking Aloud • Spring 2008

Persuasive Arts

Formation of the National Space-Based Positioning, Navigation, and
Timing Executive Committee (PNT ExCom) three years ago occurred under
circumstances as awkward as its interminable name.

Set up under the direction of a new presidential policy announced at the end of 2004, the ExCom and its National Coordination Office (NCO) emerged into an environment of proliferating user groups from every field of endeavor — all demanding service provision and protection for their unique PNT applications.

New Builds • April 15, 2008

NovAtel Offers GL1DE Technology for Precision Ag Guidance

NovAtel Inc. has launched its new GL1DE technology, the latest enhancement to the Calgary, Alberta, Canada–based company’s high-precision OEMV GNSS product line.

GL1DE is a relative pseudorange/delta-phase filter enhancement available in the coompany’s OEMV 3.400 firmware. The new technology is targeted for agricultural guidance applications in which pass-to-pass repeatability and elimination of position “jumps” is critical.

New Builds • April 14, 2008

Hemisphere GPS Announces Eclipse Developer Kit

Hemisphere GPS has released an OEM development kit for its Eclipse dual-frequency GPS receiver technology.

Development kits allow product designers and system integrators to more easily access and test all of the available features on an Eclipse board, simplifying the effort needed to reach a proof of concept and shortening the time required to bring a product to market.

Ventures • April 11, 2008

IfEN Receives ESA EGNOS-Related Contract

The European Space Agency (ESA) has awarded a contract to IfEN GmbH to develop a “New Generation” receiver breadboard for use at the European Geostationary Navigation Overlay Service (EGNOS) Ranging and Integrity Monitoring Stations (RIMS).

The RIMS New Generation breadboard will be capable of receiving the new L2C and L5 signals, the Galileo E1, E5ab, and E6 signals and the GLONASS L1 signal in addition to GPS L1 and L2P signals.

Inside GNSS • Spring 2008

U.S. PNT Initiative: E Pluribus Unum?

The GNSS world has gotten pretty complicated.

European nations and industry often comment enviously on the U.S. advantage of having a single political entity in charge of its GNSS program. They contrast the sole “ownership” of the Global Positioning System with Galileo’s dependence on consensus among the 25 member nations of the European Union and the 17 national space agencies represented in the European Space Agency.

But the closer one gets to the “unitary” American polity and GPS policy and management, the more fragmented it appears.

Inside GNSS • Spring 2008

The Art of ARTUS–A Second-Generation Galileo/GPS Receiver

Creation of new global navigation satellite systems and modernization of existing ones is introducing many new signals across a wide swath of RF spectrum now and in the near future. These developments are accompanied by a growing need to design new GNSS receivers that can work with new signal structures on an increasing number of frequencies.

Europe’s Galileo program has supported a number of activities intended to promote innovations in receiver design, such as prototype Galileo user equipment, reference receivers, and so on.

Inside GNSS • Spring 2008

Double Estimator–A New Receiver Principle for Tracking BOC signals

For the current civilian GPS C/A code transmission with which people
are most familiar, each GNSS satellite transmits an individual periodic
code employing the principle of code division multiple access (CDMA).

The code itself is modulated onto a carrier using a phase shift keying or PSK(fC) technique where fC is a code rate.

The aim of signal processing design, then, is to estimate the relative
delay in each incoming satellite signal, in order to compute the
location of the receiver.

Inside GNSS • Spring 2008

Less Is More–The Potential of Partial IMUs for Land Vehicle Navigation

GPS provides reliable long-term navigation information but requires a direct line of sight between the GPS receiver and GPS satellites. On the other hand, an inertial measurement unit (IMU) offers continuous autonomous navigation information, but its accuracy degrades over time due to the cumulative errors of the inertial sensors.

The integration of GPS’s long-term stable accuracy with the continuous but short-term accuracy of an inertial navigation system (INS) can provide accurate and uninterrupted positioning for many difficult navigation scenarios.

New Builds • April 6, 2008

Texas Instruments Launches GPS/Bluetooth/FM Chip

Texas Instruments’s (TI’s) announcement of its NaviLink 6.0 (NL5500) with integrated GPS, Bluetooth, and FM may presage the company’s expanded focus for application markets beyond cell phone handsets.

New Builds • April 6, 2008

Spirent Launches GLONASS L2 Capability in Simulator Series

UK-based Spirent Communications will introduce its new GSS8000 series of GNSS constellation simulators with GLONASS L2 capability at the Moscow International Satellite Forum April 7–8 and the European Navigation Conference–GNSS 2008 in Toulouse, France, April 22–25.

China Satellite Navigation Conference
Jammer Dectector
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