gnss

Documentation

Index

• Variables
• func ECEF2LLH(x, y, z float64, degrees bool) (latitude, longitude, height float64)
• func LLH2ECEF(latitude, longitude, height float64, degrees bool) (x, y, z float64)
• func SatAzEl(recX, recY, recZ, satX, satY, satZ float64) (azi, ele float64)
• func XYZ2NEU(refX, refY, refZ, x, y, z float64) (n, e, u float64)
• type System
  • func NewSystemFromChar(sysChar string) (System, error)
  • func ParseSystem(s string) (System, error)
  • func (sys System) Char() string
  • func (sys System) Int() int
  • func (s System) MarshalJSON() ([]byte, error)
  • func (s System) String() string
  • func (s *System) UnmarshalJSON(data []byte) error

Variables

var (
	SPEED_OF_LIGHT = 299792458.0
	// earth semimajor axis (m)
	RE_GRS80 float64 = 6378137.0
	RE_WGS84 float64 = 6378137.0
	// earth flattening
	FE_GRS80 float64 = 1.0 / 298.257222101
	FE_WGS84 float64 = 1.0 / 298.257223563
)

var SystemCodeTypes = map[System][]string{
	GPS: {

		"1C", "1S", "1L", "1X", "1P", "1W", "1Y", "1M", "1N", "1R",

		"2C", "2D", "2S", "2L", "2X", "2P", "2W", "2Y", "2M", "2N", "2R",

		"5I", "5Q", "5X",
	},
	GLONASS: {

		"1C", "1P",

		"4A", "4B", "4X",

		"2C", "2P",

		"6A", "6B", "6X",

		"3I", "3Q", "3X",
	},
	SBAS: {

		"1C",

		"5I", "5Q", "5X",
	},
	GALILEO: {

		"1A", "1B", "1C", "1X", "1Z",

		"5I", "5Q", "5X",

		"7I", "7Q", "7X",

		"8I", "8Q", "8X",

		"6A", "6B", "6C", "6X", "6Z",
	},
	BEIDOU: {

		"2I", "2Q", "2X",

		"1D", "1P", "1X",

		"1S", "1L", "1Z",

		"5D", "5P", "5X",

		"7I", "7Q", "7X",

		"7D", "7P", "7Z",

		"8D", "8P", "8X",

		"6I", "6Q", "6X",

		"6D", "6P", "6Z",
	},
	QZSS: {

		"1C", "1E", "1S", "1L", "1X", "1Z", "1B",

		"2S", "2L", "2X",

		"5I", "5Q", "5X", "5D", "5P", "5Z",

		"6S", "6L", "6X", "6E", "6Z",
	},
	IRNSS: {

		"1D", "1P", "1X",

		"5A", "5B", "5C", "5X",

		"9A", "9B", "9C", "9X",
	},
}

Map of GNSS systems to their valid code types

Functions

func ECEF2LLH

func ECEF2LLH(x, y, z float64, degrees bool) (latitude, longitude, height float64)

ECEF2LLH - Transform Earth-Centered, Earth-Fixed (ECEF) coordinates to Latitude, Longitude, and Height (LLH)

func LLH2ECEF

func LLH2ECEF(latitude, longitude, height float64, degrees bool) (x, y, z float64)

LLH2ECEF - Transform Latitude, Longitude, and Height (LLH) to Earth-Centered, Earth-Fixed (ECEF) coordinates

func SatAzEl

func SatAzEl(recX, recY, recZ, satX, satY, satZ float64) (azi, ele float64)

SatAzEl - Calculate satellite azimuth and elevation in degrees

func XYZ2NEU

func XYZ2NEU(refX, refY, refZ, x, y, z float64) (n, e, u float64)

XYZ2NEU - Calculate East, North, Up

Types

type System

type System int

System stores the GNSS constellation type

const (
	GPS System = iota
	GLONASS
	SBAS
	GALILEO
	BEIDOU
	QZSS
	IRNSS
)

Here we enumerate the current constellations

func NewSystemFromChar

func NewSystemFromChar(sysChar string) (System, error)

func ParseSystem

func ParseSystem(s string) (System, error)

func (System) Char

func (sys System) Char() string

Char returns the letter representing the system as a string

func (System) Int

func (sys System) Int() int

Int returns the integer representing the system as an int

func (System) MarshalJSON

func (s System) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface for System

func (System) String

func (s System) String() string

func (*System) UnmarshalJSON

func (s *System) UnmarshalJSON(data []byte) error

UnmarshalJSON implements the json.Unmarshaler interface for System