Railroad Operations

Railroad operations subjects GNSS systems to the most varied operating environments. Through the transit of a single train, the GNSS system is exposed to changing weather conditions, interfering RF signals, vibration and shock, as well as reduced exposures to the sky, to name a few. GNSS antennas must have the robustness to reliably operate in all environments; in particular protecting against intermodulation and saturation caused by high level cellular 700MHz signals.

With the growing availability of more Global Navigation Satellite Systems (GNSS), the proliferation of GNSS signals (including L2C and L5), and the lowering costs of precision, there is significant opportunity for railroad operators to increase the safety and reliability of their systems.

In the USA, Positive Train Control (PTC) and Positive Train Location (PTL) is taking advantage of the increasing precision of GNSS systems. GNSS provides the ability to determine direction a train is oriented, even while stopped, which track it is on, and speed of travel. All of these measures are essential for PTC and PTL. However, the roof of a locomotive is a less than ideal environment with various metal surfaces and other antennas operating in proximity to each other. Tallysman has the experience and tools to assist you in avoiding potential problems and select the ideal antenna for your situation.

Also complicating the situation is trains travel through the most varied environments. There is a growing number of geographic areas where inter-modulated cellular and other radio signals (such as the 700MHz band) have the potential to cause interference for GNSS systems. In response to this, Tallysman offers a range of robust GNSS antennas with pre-filters designed to mitigate the effects of such signals.

Robust pre-filtered antennas are available in single, dual, and triple band GNSS versions for all of the constellations. Additionally, these antennas are available in a variety of compact sizes and economical prices.

**NEW** Tallysman now offers NMO mount antennas!

Tallysman’s antennas provide:

  • More accurate positioning with Tallysman’s Accutenna® technology
  • Superior performance since Tallysman’s Accutenna® technology provides superior multi-path rejection
  • Multi-constellation (GPS, GLONASS, Galileo, and BeiDou) coverage to maximize availability of satellite signals
  • Multi-signal (L1/L2/L5, B1/B2/B3, G1/G2/G3, E15a+b, L-band)
  • Magnetic mount, Thru-hole mount or 5/8″ x11tpi mount antennas to suit your needs
  • Optional pre-filters to enhance out-of-band signal rejection (such as the 700 MHz band)
  • Robust enclosures
  • IGS and NGS calibrated antennas
  • Embedded models for incorporation in your housing
  • Wide voltage range to work with virtually every receiver on the market
  • Strong electro-static discharge immunity

There are a three distinct areas of operation where Tallysman offers improved performance for railroad operations:

A. Locomotives
The TW3000 family of antennas are compatible with commercially available rail systems which are mounted on locomotives and can be used in some cases as direct upgrades for antennas already on locomotives

Accutenna® antennas appear in red below.

ModelImageSignalsMountGain (dB)
TW3872TW38GPS L1/L2, GLONASSS G1/G2, Galileo E1, BeiDou B1Through Hole35
TW3972TW38GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B2 + L-BandThrough Hole37
TW7872GPS L1/L2, GLONASSS G1/G2, Galileo E1, BeiDou B1Magnet / Screw32
TW7972GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B2 + L-BandMagnet / Screw32

B. Base Stations
The TW3000 family of antennas offer centimeter (cm) level of PCV while the VP family of antennas offer PCV of ±1mm across all frequencies. The VP series of antennas are the highest performing GNSS antennas available offering accuracies unparalleled by other antennas.

ModelImageSignalsMountGain (dB)
TW3872TW38GPS L1/L2, GLONASSS G1/G2, Galileo E1, BeiDou B1Through Hole35
TW3972TW38GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B2 + L-BandThrough Hole37
VP6300GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B25/8” x 11tpi35 or 50
VP6000All GNSS Signals5/8” x 11tpi35 or 50

C. Timing
Tallysman’s offers GNSS antennas with pre-filters to mitigate against the growing proliferation of potentially interfering signals. Additionally, various mounting adapters are available for easy upgrading existing timing antennas and installing new locations. For further information please see: Timing

ModelImageSignalsMountGain (dB)
TW3442TW38GPS L1, GLONASS G1Through Hole40
TW3742TW38GPS L1, GLONASS G1, Galileo E1, BeiDou B1Through Hole40
TW3402TW38GPS L1, GLONASS G1Through Hole28
TW3712TW38GPS L1, GLONASS G1, Galileo E1, BeiDou B1Through Hole28

Railroad operations subjects GNSS systems to the most varied operating environments. Through the transit of a single train, the GNSS system is exposed to changing weather conditions, interfering RF signals, vibration and shock, as well as reduced exposures to the sky, to name a few. GNSS antennas must have the robustness to reliably operate in all environments; in particular protecting against intermodulation and saturation caused by high level cellular 700MHz signals.

With the growing availability of more Global Navigation Satellite Systems (GNSS), the proliferation of GNSS signals (including L2C and L5), and the lowering costs of precision, there is significant opportunity for railroad operators to increase the safety and reliability of their systems.

In the USA, Positive Train Control (PTC) and Positive Train Location (PTL) is taking advantage of the increasing precision of GNSS systems. GNSS provides the ability to determine direction a train is oriented, even while stopped, which track it is on, and speed of travel. All of these measures are essential for PTC and PTL. However, the roof of a locomotive is a less than ideal environment with various metal surfaces and other antennas operating in proximity to each other. Tallysman has the experience and tools to assist you in avoiding potential problems and select the ideal antenna for your situation.

Also complicating the situation is trains travel through the most varied environments. There is a growing number of geographic areas where inter-modulated cellular and other radio signals (such as the 700MHz band) have the potential to cause interference for GNSS systems. In response to this, Tallysman offers a range of robust GNSS antennas with pre-filters designed to mitigate the effects of such signals.

Robust pre-filtered antennas are available in single, dual, and triple band GNSS versions for all of the constellations. Additionally, these antennas are available in a variety of compact sizes and economical prices.

**NEW** Tallysman now offers NMO mount antennas!

Tallysman’s antennas provide:

  • More accurate positioning with Tallysman’s Accutenna® technology
  • Superior performance since Tallysman’s Accutenna® technology provides superior multi-path rejection
  • Multi-constellation (GPS, GLONASS, Galileo, and BeiDou) coverage to maximize availability of satellite signals
  • Multi-signal (L1/L2/L5, B1/B2/B3, G1/G2/G3, E15a+b, L-band)
  • Magnetic mount, Thru-hole mount or 5/8″ x11tpi mount antennas to suit your needs
  • Optional pre-filters to enhance out-of-band signal rejection (such as the 700 MHz band)
  • Robust enclosures
  • IGS and NGS calibrated antennas
  • Embedded models for incorporation in your housing
  • Wide voltage range to work with virtually every receiver on the market
  • Strong electro-static discharge immunity

There are a three distinct areas of operation where Tallysman offers improved performance for railroad operations:

A. Locomotives
The TW3000 family of antennas are compatible with commercially available rail systems which are mounted on locomotives and can be used in some cases as direct upgrades for antennas already on locomotives

Accutenna® antennas appear in red below.

ModelImageSignalsMountGain (dB)
TW3872TW38GPS L1/L2, GLONASSS G1/G2, Galileo E1, BeiDou B1Through Hole35
TW3972TW38GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B2 + L-BandThrough Hole37
TW7872GPS L1/L2, GLONASSS G1/G2, Galileo E1, BeiDou B1Magnet / Screw32
TW7972GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B2 + L-BandMagnet / Screw32

B. Base Stations
The TW3000 family of antennas offer centimeter (cm) level of PCV while the VP family of antennas offer PCV of ±1mm across all frequencies. The VP series of antennas are the highest performing GNSS antennas available offering accuracies unparalleled by other antennas.

ModelImageSignalsMountGain (dB)
TW3872TW38GPS L1/L2, GLONASSS G1/G2, Galileo E1, BeiDou B1Through Hole35
TW3972TW38GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B2 + L-BandThrough Hole37
VP6300GPS L1/L2/L5, GLONASSS G1/G2/G3 Galileo E1/E5a+b, BeiDou B1/B25/8” x 11tpi35 or 50
VP6000All GNSS Signals5/8” x 11tpi35 or 50

C. Timing
Tallysman’s offers GNSS antennas with pre-filters to mitigate against the growing proliferation of potentially interfering signals. Additionally, various mounting adapters are available for easy upgrading existing timing antennas and installing new locations. For further information please see: Timing

ModelImageSignalsMountGain (dB)
TW3442TW38GPS L1, GLONASS G1Through Hole40
TW3742TW38GPS L1, GLONASS G1, Galileo E1, BeiDou B1Through Hole40
TW3402TW38GPS L1, GLONASS G1Through Hole28
TW3712TW38GPS L1, GLONASS G1, Galileo E1, BeiDou B1Through Hole28