Technical Article Archives - Page 8 of 12 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

January 23, 2013

Developing a GNSS Position and Timing Authentication Testbed

FIGURE 1: Characterization of interference from the user perspective

Increasing demand for ensuring the authenticity of satellite signals and position/velocity/time (PVT) calculations raises the need for tools capable of assessing and testing innovative solutions for verifying GNSS signals and PVT. Today’s civilian systems do not provide authentication at the system level, and a number of mitigation strategies have been developed in the last 10 years at user segment in order to protect receivers from interference and deception.

By Inside GNSS

November 25, 2012

Figures 2 & 3: LTE, Positioning, and the Implications for GNSS Over-the-Air Testing

FIGURE 1: (top) Device without case. (bottom) Device with case.

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By Inside GNSS

November 14, 2012

LTE, Positioning, and the Implications for GNSS Over-the-Air Testing

FIGURE 1: (top) Device without case. (bottom) Device with case.

Long Term Evolution (LTE) technology in mobile communications, often called 4G, is making its way into a host of consumer devices. It started with data-only modules for Internet connectivity but quickly made its mark on smartphones, automotive communication, and embedded modules that provide fast and reliable wireless data connectivity to the machine-to-machine (M2M) market.

By Inside GNSS

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September 3, 2012

Improving GNSS Attitude Determination

This article describes an integration of a single-frequency GNSS, two-antenna heading system with low-cost inertial and magnetic field sensors in order to improve the availability and reliability of pure GNSS attitude determination. This method calculates a redundant attitude solution in an error-state Kalman filter using different sensor setups. As a result, the process of carrier phase ambiguity resolution accelerates.

By Inside GNSS

July 27, 2012

Tables 4 & 5: INS Face Off

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By Inside GNSS

Tables 1, 2 & 3: INS Face Off

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By Inside GNSS

Figures 4, 5 & 6: INS Face Off

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By Inside GNSS

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Figures 1, 2 & 3: INS Face Off

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By Inside GNSS

July 5, 2012

INS Face Off

TOP PHOTO: Antenna configurations on trials vehicle: Dual GPS antennas for the INS under test and single GPS antenna for the CIMU; BOTTOM PHOTO: Commercial IMU/DGPS system used for reference (left), FOG-based INS configuration (middle), and MEMS-based INS configuration 2 (right)

The automobile versus the horse and buggy. Cloud computing opposite desktop software. The trend is predictable, yet it is always surprising when one technology takes over the market space of another. After all, television did kill off the radio star.

By Inside GNSS

May 28, 2012

Figures 1, 2 & 3: Demystifying GLONASS Inter-Frequency Carrier Phase Biases

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By Inside GNSS

May 25, 2012

Demystifying GLONASS Inter-Frequency Carrier Phase Biases

EQUATIONS 1 -11

GLONASS currently uses a frequency division multiple access (FDMA) technique to distinguish the signals coming from different satellites in the Russian GNSS constellation. The GLONASS L1 and L2 bands are divided into 14 sub-bands, and each satellite transmits in one of these.

The sub-bands are identified by frequency numbers k, from -7 to 6. The GLONASS L1 and L2 carrier frequencies, in hertz, at a frequency number k are defined by:

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By Inside GNSS