Urban canyon definition

Urban canyon means a scenario reproducing the satellite visibility conditions in urban areas; in which the GNSS signals are affected by buildings, trees, etc. making them difficult to reach the GNSS receiver.

Examples of Urban canyon in a sentence

  • Urban canyon environments are not conducive to utilization of satellite-based communication for over-the-horizon (OTH) communication.

  • DeploymentArea of interest: Segment of a street, 200 m long, 3 lanesin each direction (6 lanes in total)Lane width: 2.75 m Sidewalk width: 3m Total street width: 22.5m Propagation: Urban canyon, street is surrounded by con- crete buildings of 30 m heightRadio partEnvironment: Air, T = 296 K and 1.8% of water vaporFrequency: 300 GHz Bandwidth: 10 GHz Tx power: 0 dBmTx antenna gain: 30 dBRx antenna gain: 30 dBAntennas: In front and rear bumpers (0.2 m altitude).

  • Urban canyon plot.Attenuation: Tests results are considered satisfactory if horizontal coordinates errors obtained with all AECD samples do not exceed 40 m in urban canyon conditions at confidence level 0.95.Cold start time to first fix test.

  • It can use this information to search for satellite but will then need to demodulate the ephemeris data from acquired signals;Cold Start: receiver has no almanac, ephemeris or approximate position information to achieve a position fix.TTFF measured in Urban canyon condition for different GPS modules70 60 50 40 30Receiver AReceiver B Receiver C20 10 0Cold startWarm startHot startTTFF [seFigure 7 shows the results from testing 3 different receivers over many repeated tests in urban areas.

  • Urban canyon scenario in a 3-d ray-tracing simulator with vehicles of distinct sizes randomly positioned.

  • Urban canyon noise may obscure the precise time and location of a modal interface; however, map-matching to the actual physical location of subway entrances and bus stops can subsequently resolve the most likely modal interface location.The research included a series of processing steps beginning with the preparing the data for analysis and concluding with the development of an algorithm.

  • Table 2.1: Urban canyon geometry of the three primary measurement sites.

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