High accuracy survey positioning employs two different techniques. The most common survey technique is Real-Time Kinematic (RTK), where a base station (located at a know point) transmits station position and observations to a rover that then estimates its position relative to the base station. Precise Point Positioning (PPP) is an absolute positioning technique where the user/rover receives a correction stream and estimates the survey objects position.
RTK and PPP has evolved from using only GPS observations to now using: GLONASS, Galileo, BeiDou and QZSS data. The addition of the more recent constellations has increased the number of satellites observed from 10 to as many as 30-40. New constellations also broadcast measurement signals at new frequencies.
GNSS survey antennas now must support all constellations and signals. Calian offers a broad range of economical high performance antennas multi constellation and multiband antennas, employing its Accutenna®, VeroStarTM and VeraPhase® technologies.
Calian’s antennas provide:
- More accurate positioning of assets
- Superior performance in urban canyons or high reflection environments since Calian’s antennas provide superior multi-path rejection
- Multi-constellation (GPS, GLONASS, Galileo, and BeiDou) coverage to maximize availability of satellite signals
- Range of sizes from very compact to mid-sized to suit most every application
- Low current models to address applications requiring the use of battery powered receivers
- Wide voltage range to work with virtually every receiver on the market
- Models for Iridium™ use
- Strong electrostatic discharge immunity
- Optional pre-filters to enhance out-of-band signal rejection (such as the 700 MHz band)
- Embedded versions to use in your own housing