GPS

Evaluating the Performance of Navigation Payloads

Evaluating the Performance of Navigation Payloads

As a navigation satellite transmits multiple signals on single frequency (e.g., Open Service and Restricted Service over L5 Band), these are combined on a common carrier to comprise a composite signal. This composite signal passes through navigation payload subsystems such as an up-converter, traveling wave tube amplifier (TWTA), filters, and so on. These subsystems may introduce adverse effects on the signal, such as amplitude and phase distortion, nonlinear effects, gain imbalance, IQ imbalance, and phase noise.

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By Inside GNSS
Higher Aspirations for GNSS

Higher Aspirations for GNSS

GPS Space Service Volume (SSV) Requirements/Performance Parameters

New space missions such as the robotic repair and recovery of damaged or errant communication satellites may become possible with the aid of an emerging class of receivers that is able to use GPS signals for navigation in orbits thousands of kilometers above the middle Earth orbit (MEO) GPS constellation itself.

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By Dee Ann Divis
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First GPS III Launch Slips to FY17
November 14, 2014

First GPS III Launch Slips to FY17

GPS III core structure at Lockheed Martin facility. Lockheed Martin photo

The launch of the first GPS III satellite could slip to as late as March 2017, further delaying a modernization program that already has been pushed back repeatedly by budget cuts and technical problems.

“The first GPS III launch is tentatively considered for the first half of FY17, based on booster availability and Air Force launch priorities,” a spokesman for the Space and Missile Systems Center told Inside GNSS.

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By Inside GNSS
Topcon Engineers Track New GLONASS Signal

Topcon Engineers Track New GLONASS Signal

Implementation of code-Phase structures for GLONASS signals ?/?, L2C and L3

Topcon Positioning Group has announced that its latest GNSS reference receiver has tracked a new signal from the GLONASS constellation.

The GLONASS-M 55 satellite was launched in June and is equipped
with an experimental payload capable of transmitting CDMA signals in the
Russian GNSS system’s L3 frequency band centered at 1202.025 MHz. According to the company, Topcon engineers successfully tracked the signal using the NET-G5
receiver during a series of recent tests at the Topcon Technology Center
in Moscow, Russia.

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By Inside GNSS
Tallysman Launches Smart GPS-GLONASS Antenna
November 6, 2014

Tallysman Launches Smart GPS-GLONASS Antenna

Tallysman has introduced the TW5340 “smart” antenna that pairs Tallysman‘s Accutenna technology with STMicroelectronics’ Teseo II GNSS receiver.

The TW5340 is a multi-constellation GNSS antenna that provides simultaneous GPS/GLONASS/SBAS reception and is designed for use in professional grade applications such as precision timing, network synchronization, or low-current  and tracking/positioning applications.

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By Inside GNSS
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Airbus GNSS Engineers Win Top ESNC 2014 Prize

Airbus GNSS Engineers Win Top ESNC 2014 Prize

The European Satellite Navigation Competition (ESNC) has gone Big Time.

Unlike past years, when product designers and engineers from small- and medium-sized enterprises (SME) have walked away with the top prize, this year’s overall winner was Airbus Defence & Space (Airbus DS GmbH), a division of the Airbus Group (formerly EADS). Headquartered in France and generating annual revenues of €14 billion, Airbus DS was established last year by the merger of the parent company’s Airbus Military, Astrium, and Cassidian units.

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By Inside GNSS
KCS Launches OEM TraceME Tracking Module
October 29, 2014

KCS Launches OEM TraceME Tracking Module

KCS TM-202LAR GPS/RF/GSM module

KCS bv, based in Dordrecht, The Netherlands, has introduced the newest OEM addition to its family of TraceME products, the TM-202LAR, a GPS/RF/GSM module intended for incorporation into products and systems used for tracking people, vehicles, and objects.

Measuring 46x21x6.5 millimeters and weighing seven grams, the low-power TM-202LAR incorporates a 48-channel CSR SiRFstar-IV GSD4e GPS L1 receiver, GPRS/GSM modem (QUAD band version) for RF connectivity up to two kilometers (1.2 miles), and a 3D magnetic compass and 3D accelerometer the operates at up to 16g.
 

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By Inside GNSS
8th GPS IIF Satellite Begins Transmitting Nav Signals

8th GPS IIF Satellite Begins Transmitting Nav Signals

[Updated December 15, 2014] The eighth GPS Block IIF navigation satellite launched on October 29 has completed its operational checkout and was set to healthy and usable on Friday (December 12, 2014). This brings the number of satellites transmitting the L2C signal to 15 and those transmitting the L5 signal to 8.  The next GPS-IIF satellite, IIF-9/SVN-70 is tentatively scheduled for launch in March of 2015.

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By Inside GNSS
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