gpsutils

package
v0.28.0-rc0 Latest Latest
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 Go to latest Published: May 23, 2024 License: AGPL-3.0 Imports: 26 Imported by: 0

Documentation

Overview

Package gpsutils contains GPS-related code shared between multiple components. This file describes data structures used to configure reading from NMEA devices.

Package gpsutils implements a GPS NMEA component. This file contains ways to read data from a PMTK device connected over the I2C bus.

Package gpsutils implements necessary functions to set and return NTRIP information here.

Package gpsutils contains code shared between multiple GPS implementations. This file is about how to interact with a PMTK device (a device which gets data from GPS satellites) connected by a serial port.

Package gpsutils implements functions that are used in the gpsrtkserial and gpsrtkpmtk.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func ConnectToVirtualBase 

func ConnectToVirtualBase(ntripInfo *NtripInfo,
	logger logging.Logger,
) (*bufio.ReadWriter, error)

ConnectToVirtualBase is responsible for establishing a connection to a virtual base station using the NTRIP protocol.

func ContainsGGAMessage 

func ContainsGGAMessage(data []byte) bool

ContainsGGAMessage returns true if data contains GGA message.

func GetGGAMessage 

func GetGGAMessage(correctionWriter io.ReadWriteCloser, logger logging.Logger) ([]byte, error)

GetGGAMessage checks if a GGA message exists in the buffer and returns it.

func HasVRSStream added in v0.24.0 

func HasVRSStream(sourceTable *Sourcetable, mountPoint string) (bool, error)

HasVRSStream returns the NMEA field associated with the given mountpoint and whether it is a Virtual Reference Station.

Types

type CachedData 

type CachedData struct {
	// contains filtered or unexported fields
}

CachedData allows the use of any MovementSensor chip via a DataReader.

func NewCachedData 

func NewCachedData(dev DataReader, logger logging.Logger) *CachedData

NewCachedData creates a new CachedData object.

func (*CachedData) Accuracy 

func (g *CachedData) Accuracy(
	ctx context.Context, extra map[string]interface{},
) (*movementsensor.Accuracy, error)

Accuracy returns the accuracy map, hDOP, vDOP, Fixquality and compass heading error.

func (*CachedData) AngularVelocity 

func (g *CachedData) AngularVelocity(
	ctx context.Context, extra map[string]interface{},
) (spatialmath.AngularVelocity, error)

AngularVelocity returns the sensor's angular velocity.

func (*CachedData) Close 

func (g *CachedData) Close(ctx context.Context) error

Close shuts down the DataReader feeding this struct.

func (*CachedData) CompassHeading 

func (g *CachedData) CompassHeading(
	ctx context.Context, extra map[string]interface{},
) (float64, error)

CompassHeading returns the heading, from the range 0->360.

func (*CachedData) LinearAcceleration 

func (g *CachedData) LinearAcceleration(
	ctx context.Context, extra map[string]interface{},
) (r3.Vector, error)

LinearAcceleration returns the sensor's linear acceleration.

func (*CachedData) LinearVelocity 

func (g *CachedData) LinearVelocity(
	ctx context.Context, extra map[string]interface{},
) (r3.Vector, error)

LinearVelocity returns the sensor's linear velocity. It requires having a compass heading, so we know which direction our speed is in. We assume all of this speed is horizontal, and not in gaining/losing altitude.

func (*CachedData) Orientation 

func (g *CachedData) Orientation(
	ctx context.Context, extra map[string]interface{},
) (spatialmath.Orientation, error)

Orientation returns the sensor's orientation.

func (*CachedData) ParseAndUpdate 

func (g *CachedData) ParseAndUpdate(line string) error

ParseAndUpdate passes the provided message into the inner NmeaParser object, which parses the NMEA message and updates its state to match.

func (*CachedData) Position 

func (g *CachedData) Position(
	ctx context.Context, extra map[string]interface{},
) (*geo.Point, float64, error)

Position returns the position and altitide of the sensor, or an error.

func (*CachedData) Properties 

func (g *CachedData) Properties(
	ctx context.Context, extra map[string]interface{},
) (*movementsensor.Properties, error)

Properties returns what movement sensor capabilities we have.

func (*CachedData) ReadFix 

func (g *CachedData) ReadFix(ctx context.Context) (int, error)

ReadFix returns Fix quality of MovementSensor measurements.

func (*CachedData) ReadSatsInView 

func (g *CachedData) ReadSatsInView(ctx context.Context) (int, error)

ReadSatsInView returns the number of satellites in view.

type DataReader 

type DataReader interface {
	Messages() chan string
	Close() error
}

DataReader represents a way to get data from a GPS NMEA device. We can read data from it using the channel in Messages, and we can close the device when we're done.

func NewI2cDataReader 

func NewI2cDataReader(config I2CConfig, bus buses.I2C, logger logging.Logger) (DataReader, error)

NewI2cDataReader constructs a new DataReader that gets its NMEA messages over an I2C bus.

func NewSerialDataReader 

func NewSerialDataReader(config *SerialConfig, logger logging.Logger) (DataReader, error)

NewSerialDataReader constructs a new DataReader that gets its NMEA messages over a serial port.

type I2CConfig 

type I2CConfig struct {
	I2CBus      string `json:"i2c_bus"`
	I2CAddr     int    `json:"i2c_addr"`
	I2CBaudRate int    `json:"i2c_baud_rate,omitempty"`
}

I2CConfig is used for converting Serial NMEA MovementSensor config attributes.

func (*I2CConfig) Validate 

func (cfg *I2CConfig) Validate(path string) error

Validate ensures all parts of the config are valid.

type NmeaParser 

type NmeaParser struct {
	Location   *geo.Point
	Alt        float64
	Speed      float64 // ground speed in m per sec
	VDOP       float64 // vertical accuracy
	HDOP       float64 // horizontal accuracy
	SatsInView int     // quantity satellites in view
	SatsInUse  int     // quantity satellites in view

	FixQuality     int
	CompassHeading float64 // true compass heading in degree
	// contains filtered or unexported fields
}

NmeaParser struct combines various attributes related to GPS.

func (*NmeaParser) ParseAndUpdate 

func (g *NmeaParser) ParseAndUpdate(line string) error

ParseAndUpdate will attempt to parse a line to an NMEA sentence, and if valid, will try to update the given struct with the values for that line. Nothing will be updated if there is not a valid gps fix.

type NtripConfig 

type NtripConfig struct {
	NtripURL             string `json:"ntrip_url"`
	NtripConnectAttempts int    `json:"ntrip_connect_attempts,omitempty"`
	NtripMountpoint      string `json:"ntrip_mountpoint,omitempty"`
	NtripUser            string `json:"ntrip_username,omitempty"`
	NtripPass            string `json:"ntrip_password,omitempty"`
}

NtripConfig is used for converting attributes for a correction source.

type NtripInfo 

type NtripInfo struct {
	URL string

	MountPoint         string
	Client             *ntrip.Client
	Stream             io.ReadCloser
	MaxConnectAttempts int
	// contains filtered or unexported fields
}

NtripInfo contains the information necessary to connect to a mountpoint.

func NewNtripInfo 

func NewNtripInfo(cfg *NtripConfig, logger logging.Logger) (*NtripInfo, error)

NewNtripInfo function validates and sets NtripConfig arributes and returns NtripInfo.

func (*NtripInfo) Connect 

func (n *NtripInfo) Connect(ctx context.Context, logger logging.Logger) error

Connect attempts to initialize a new ntrip client. If we're unable to connect after multiple attempts, we return the last error.

func (*NtripInfo) ParseSourcetable 

func (n *NtripInfo) ParseSourcetable(logger logging.Logger) (*Sourcetable, error)

ParseSourcetable gets the sourcetable and parses it.

type PmtkI2cDataReader 

type PmtkI2cDataReader struct {
	// contains filtered or unexported fields
}

PmtkI2cDataReader implements the DataReader interface for a PMTK device by communicating with it over an I2C bus.

func (*PmtkI2cDataReader) Close 

func (dr *PmtkI2cDataReader) Close() error

Close is part of the DataReader interface. It shuts everything down.

func (*PmtkI2cDataReader) Messages 

func (dr *PmtkI2cDataReader) Messages() chan string

Messages returns the channel of complete NMEA sentences we have read off of the device. It's part of the DataReader interface.

type SerialConfig 

type SerialConfig struct {
	SerialPath     string `json:"serial_path"`
	SerialBaudRate int    `json:"serial_baud_rate,omitempty"`

	// TestChan is a fake "serial" path for test use only
	TestChan chan []uint8 `json:"-"`
}

SerialConfig is used for converting Serial NMEA MovementSensor config attributes.

func (*SerialConfig) Validate 

func (cfg *SerialConfig) Validate(path string) error

Validate ensures all parts of the config are valid.

type SerialDataReader 

type SerialDataReader struct {
	// contains filtered or unexported fields
}

SerialDataReader implements the DataReader interface (defined in component.go) by interacting with the device over a serial port.

func (*SerialDataReader) Close 

func (dr *SerialDataReader) Close() error

Close is part of the DataReader interface. It shuts everything down, including our connection to the serial port.

func (*SerialDataReader) Messages 

func (dr *SerialDataReader) Messages() chan string

Messages returns the channel of complete NMEA sentences we have read off of the device. It's part of the DataReader interface.

type Sourcetable 

type Sourcetable struct {
	Streams []Stream
}

Sourcetable struct contains the stream.

func (*Sourcetable) HasStream 

func (st *Sourcetable) HasStream(mountpoint string) (Stream, bool)

HasStream checks if the sourcetable contains the given mountpoint in it's stream.

type Stream 

type Stream struct {
	MP             string   // Datastream mountpoint
	Identifier     string   // Source identifier (most time nearest city)
	Format         string   // Data format of generic type (https://software.rtcm-ntrip.org/wiki/STR#DataFormats)
	FormatDetails  string   // Specifics of data format (https://software.rtcm-ntrip.org/wiki/STR#DataFormats)
	Carrier        int      // Phase information about GNSS correction (https://software.rtcm-ntrip.org/wiki/STR#Carrier)
	NavSystem      []string // Multiple navigation system (https://software.rtcm-ntrip.org/wiki/STR#NavigationSystem)
	Network        string   // Network record in sourcetable (https://software.rtcm-ntrip.org/wiki/NET)
	Country        string   // ISO 3166 country code (https://en.wikipedia.org/wiki/ISO_3166-1)
	Latitude       float32  // Position, Latitude in degree
	Longitude      float32  // Position, Longitude in degree
	Nmea           bool     // Caster requires NMEA input (1) or not (0)
	Solution       int      // Generated by single base (0) or network (1)
	Generator      string   // Generating soft- or hardware
	Compression    string   // Compression algorithm
	Authentication string   // Access protection for data streams None (N), Basic (B) or Digest (D)
	Fee            bool     // User fee for data access: yes (Y) or no (N)
	BitRate        int      // Datarate in bits per second
	Misc           string   // Miscellaneous information
}

Stream contrains a stream record in sourcetable. https://software.rtcm-ntrip.org/wiki/STR

Source Files

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