Geoconnect is a specialist GNSS Dealer and offers Rugged Computing and Software Solutions

What is Carrier Phase?

What is Carrier Phase ?

Ashtech offers the possibility to use carrier-phase techniques to achieve higher accuracy (centimetre level). This method counts the exact number of cycles of the carrying frequency between the GPS satellites and the receiver’s antenna.

The process requires an initial observation time to resolve the carrier-phase ambiguity. This period varies depending on the number of satellites available, the quality of the constellation, the baseline length (distance between base station and rover) and the technique used (On-the-fly Realtime Kinematics, Post-processed Static or Semi-kinematics, etc).

Ashtech History


Sercel an electronics company in France starts the radiopositioning business using land based UHF transmiters at the time.

NAVSTAR (Navigation System with Timing And Ranging), now known as GPS (Global Positioning System), launched by U.S. Department of Defense.

What is Blade

What is BLADE?
Ashtech invests heavily in the development of cutting-edge technology to further strengthen its position as a leading designer and developer of precision positioning technology. Recent developments have produced greater product integration and progressive augmentations to GPS/GNSS. These advances are apparent in the latest line of professional products including the new Ashtech BLADE™ Technology.

Archer SD & CF Sizes

Maximum SD and CF card height (length)

July 2007

Secure Digital (SD) CardsThe standard SD card height is 32 millimeters, which is recommended for cards that are to be used under the standard top cap of the Archer Field PC. If an SD card exceeds this height, use a taller cap to avoid damage to the Archer or to the card, and to maintain the water-tight seal. Below is a list of the maximum SD card height for each of the Archer caps.

What is Rugged?

Explaining the ruggedness testing standards

Handheld computers are becoming increasing popular for use outside the office. Their versatility makes them useful tools for public safety, law enforcement, field service, and construction, as well as utility, forestry and military applications.

What is Glonass?

GLONASS (RussianГЛОНАСС, abbreviation of ГЛОбальная НАвигационная СпутниковаяСистема; tr.GLObal’naya NAvigatsionnaya Sputnikovaya Sistema; “GLObal NAvigation SatelliteSystem” in English) is a radio-based satellite navigation system, developed by the former Soviet Union and now operated for the Russian government by the Russian Space Forces.

It is an alternative and complementary to the United States‘ Global Positioning System (GPS), the Chinese COMPASS Navigation System, and the planned Galileo positioning system of the European Union (EU).

Development on the GLONASS began in 1976, with a goal of global coverage by 1991. Beginning on 12 October 1982, numerous rocket launches added satellites to the system until the constellation was completed in 1995. Following completion, the system rapidly fell into disrepair with the collapse of the Russian economy. Beginning in 2001, Russia committed to restoring the system, and in recent years has diversified, introducing the Indian government as a partner, and accelerated the program with a goal of restoring global coverage by 2009.[1]

What is Geotagging?

Geotagging is the process of adding geographical identification metadata to various media such as photographs, video, websites, or RSS feeds and is a form of geospatial metadata. These data usually consist of latitude and longitude coordinates, though they can also include altitudebearing, accuracy data, and place names.

Geotagging can help users find a wide variety of location-specific information. For instance, one can find images taken near a given location by entering latitude and longitude coordinates into a Geotagging-enabled image search engine. Geotagging-enabled information services can also potentially be used to find location-based news, websites, or other resources.[1]

Less commonly, this process has been called geocoding (ie. a geocoded photograph), a term that more often refers to the process of taking non-coordinate based geographical identifiers, such as a street address, and finding associated geographic coordinates (or vice versa for reverse geocoding), or to the use of a camera that inserts the coordinates when making the picture, for example using its built in GPS receiver.

Source: Wikipedia.

GPS signals (L1, L2, L5)

Global Positioning System (GPS) satellites broadcast radio signals to enable GPS receivers to determine location and synchronized time.

GPS signals include ranging signals, used to measure the distance to the satellite, and navigation messages. The navigation messages include ephemeris data, used to calculate the position of the satellite in orbit, and information about the time and status of the satellite constellation.