Aprs.UtilityHelpers (aprs v1.0.1)

Utility helpers for APRS parsing using binary pattern matching.

Summary

Functions

calculate_compressed_position_resolution()

Calculate compressed position resolution.

calculate_position_ambiguity(lat, lon)

Calculate position ambiguity based on leading spaces.

calculate_position_resolution(ambiguity)

Calculate position resolution based on ambiguity.

count_leading_braces(str)

Count leading braces (}) in a string.

count_spaces(str)

Count spaces in a string.

position_resolution(ambiguity)

Calculate position resolution in meters based on ambiguity level.

validate_position_data(latitude, longitude)

validate_timestamp(time)

Functions

calculate_compressed_position_resolution()

@spec calculate_compressed_position_resolution() :: float()

Calculate compressed position resolution.

calculate_position_ambiguity(lat, lon)

@spec calculate_position_ambiguity(String.t(), String.t()) :: integer()

Calculate position ambiguity based on leading spaces.

calculate_position_resolution(ambiguity)

@spec calculate_position_resolution(integer()) :: integer()

Calculate position resolution based on ambiguity.

count_leading_braces(str)

@spec count_leading_braces(String.t()) :: integer()

Count leading braces (}) in a string.

count_spaces(str)

@spec count_spaces(String.t()) :: integer()

Count spaces in a string.

position_resolution(ambiguity)

@spec position_resolution(integer()) :: integer()

Calculate position resolution in meters based on ambiguity level.

validate_position_data(latitude, longitude)

@spec validate_position_data(String.t(), String.t()) ::
  {:ok, {float(), float()}} | {:error, :invalid_position}

validate_timestamp(time)

@spec validate_timestamp(String.t()) :: integer() | nil