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gnss-converters 0.3.9 → 0.3.10

raw patch · 2 files changed

+131/−1 lines, 2 files

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gnss-converters.cabal view
@@ -1,5 +1,5 @@ name: gnss-converters-version: 0.3.9+version: 0.3.10 cabal-version: >=1.22 build-type: Simple license: BSD3@@ -19,6 +19,7 @@ library     exposed-modules:         Data.RTCM3.SBP+        Data.RTCM3.SBP.Ephemerides         Data.RTCM3.SBP.Observations         Data.RTCM3.SBP.Positions         Data.RTCM3.SBP.Time
+ src/Data/RTCM3/SBP/Ephemerides.hs view
@@ -0,0 +1,129 @@+{-# LANGUAGE NoImplicitPrelude #-}++-- |+-- Module:      Data.RTCM3.SBP.Ephemerides+-- Copyright:   Copyright (C) 2016 Swift Navigation, Inc.+-- License:     LGPL-3+-- Maintainer:  Swift Navigation <dev@swiftnav.com>+-- Stability:   experimental+-- Portability: portable+--+-- RTCMv3 to SBP Ephemerides Conversions.++module Data.RTCM3.SBP.Ephemerides+  ( converter+  ) where++import BasicPrelude+import Control.Lens+import Data.Bits+import Data.Conduit+import Data.RTCM3+import Data.RTCM3.SBP.Time+import Data.Word+import SwiftNav.SBP++--------------------------------------------------------------------------------+-- GNSS RTCM observation reconstruction utilities++-- | Produce GPS time from RTCM time (week-number % 1024, tow in seconds, scaled 2^4).+-- Stateful but non-side-effecting. The week number is mod-1024 - add in the base+-- wn from the stored wn masked to 10 bits.+toGpsTimeSec :: MonadIO m => Word16 -> Word16 -> m GpsTimeSec+toGpsTimeSec wn tow = do+  wn' <- view gpsTimeNano_wn <$> currentGpsTime+  return GpsTimeSec+    { _gpsTimeSec_tow = 16 * fromIntegral tow+    , _gpsTimeSec_wn  = wn' `shiftR` 10 `shiftL` 10 + wn+    }++-- | Validate IODE/IODC flags. The IODC and IODE flags (least significant bits) should be+-- equal. IODC is Word16 while IODE is Word8, so we shift IODC to drop the most significant bits.+-- We return a 1 if valid, 0 if invalid.+validateIodcIode :: Word16 -> Word8 -> Word8+validateIodcIode iodc iode =+  bool 0 1 $ iodc' == iode+  where+    iodc' = fromIntegral $ iodc `shiftL` 8 `shiftR` 8++-- | Convert between RTCM/GPS URA ("User Range Accuracy") index to a number in meters.+-- See section 2.5.3, "User Range Accuracy", in the GPS signal specification.+-- Indices 1, 3, and 5 are hard-coded according to spec, and 15 is hard-coded according+-- to SBP/Piksi convention.+uriToUra :: Double -> Double+uriToUra uri+  | uri < 0 = -1+  | uri == 1 = 2.8+  | uri == 3 = 5.7+  | uri == 5 = 11.3+  | uri == 15 = 6144+  | uri <= 6 = 2 ** (1 + (uri / 2))+  | uri > 6 && uri < 15 = 2 ** (uri - 2)+  | otherwise = -1++-- | Decode SBP 'fitInterval' from RTCM/GPS 'fitIntervalFlag' and IODC.+-- Implementation adapted from libswiftnav/ephemeris.c.+fitInterval :: Bool -> Word16 -> Word32+fitInterval fitInt iodc+  | not fitInt = 4 * 60 * 60+  | iodc >= 240 && iodc <= 247 = 8 * 60 * 60+  | (iodc >= 248 && iodc <= 255) || iodc == 496 = 14 * 60 * 60+  | (iodc >= 497 && iodc <= 503) || (iodc >= 1021 && iodc <= 1023) = 26 * 60 * 60+  | iodc >= 504 && iodc <= 510 = 50 * 60 * 60+  | iodc == 511 || (iodc >= 752 && iodc <= 756) = 74 * 60 * 60+  | iodc == 757 = 98 * 60 * 60+  | otherwise = 6 * 60 * 60++-- | Construct an EphemerisCommonContent from an RTCM 1019 message.+toGpsEphemerisCommonContent :: MonadIO m => Msg1019 -> m EphemerisCommonContent+toGpsEphemerisCommonContent m = do+  toe <- toGpsTimeSec (m ^. msg1019_ephemeris ^. gpsEphemeris_wn) (m ^. msg1019_ephemeris ^. gpsEphemeris_toe)+  return EphemerisCommonContent+    { _ephemerisCommonContent_sid = GnssSignal16+      { _gnssSignal16_sat  = m ^. msg1019_header ^. gpsEphemerisHeader_sat+      , _gnssSignal16_code = 0 -- there is an L2P status flag in msg 1019, but I don't think that applies+      }+    , _ephemerisCommonContent_toe          = toe+    , _ephemerisCommonContent_ura          = uriToUra (fromIntegral $ m ^. msg1019_ephemeris ^. gpsEphemeris_svHealth)+    , _ephemerisCommonContent_fit_interval = fitInterval (m ^. msg1019_ephemeris ^. gpsEphemeris_fitInterval) (m ^. msg1019_ephemeris ^. gpsEphemeris_iodc)+    , _ephemerisCommonContent_valid        = validateIodcIode (m ^. msg1019_ephemeris ^. gpsEphemeris_iodc) (m ^. msg1019_ephemeris ^. gpsEphemeris_iode)+    , _ephemerisCommonContent_health_bits  = m ^. msg1019_ephemeris ^. gpsEphemeris_svHealth+    }++--------------------------------------------------------------------------------+-- RTCM to SBP conversion utilities: RTCM Msgs. 1002 (L1 RTK), 1004 (L1+L2 RTK),+-- 1005 (antenna position), 1006 (antenna position).++-- | Convert an RTCM 1019 GPS ephemeris message into an SBP MsgEphemerisGps.+converter :: MonadIO m => Msg1019 -> Conduit i m [SBPMsg]+converter m = do+  common <- toGpsEphemerisCommonContent m+  toc    <- toGpsTimeSec (m ^. msg1019_ephemeris ^. gpsEphemeris_wn) (m ^. msg1019_ephemeris ^. gpsEphemeris_toc)+  let pi'    = 3.1415926535898+      p ## x = (2 ** p) * fromIntegral x+      m'     = MsgEphemerisGps+                 { _msgEphemerisGps_common   = common+                 , _msgEphemerisGps_tgd      =       (-31) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_tgd)+                 , _msgEphemerisGps_c_rs     =        (-5) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_c_rs)+                 , _msgEphemerisGps_c_rc     =        (-5) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_c_rc)+                 , _msgEphemerisGps_c_uc     =       (-29) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_c_uc)+                 , _msgEphemerisGps_c_us     =       (-29) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_c_us)+                 , _msgEphemerisGps_c_ic     =       (-29) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_c_ic)+                 , _msgEphemerisGps_c_is     =       (-29) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_c_is)+                 , _msgEphemerisGps_dn       = pi' * (-43) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_dn)+                 , _msgEphemerisGps_m0       = pi' * (-31) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_m0)+                 , _msgEphemerisGps_ecc      =       (-33) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_ecc)+                 , _msgEphemerisGps_sqrta    =       (-19) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_sqrta)+                 , _msgEphemerisGps_omega0   = pi' * (-31) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_omega0)+                 , _msgEphemerisGps_omegadot = pi' * (-43) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_omegadot)+                 , _msgEphemerisGps_w        = pi' * (-31) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_w)+                 , _msgEphemerisGps_inc      = pi' * (-31) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_i0)+                 , _msgEphemerisGps_inc_dot  = pi' * (-43) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_idot)+                 , _msgEphemerisGps_af0      =       (-31) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_af0)+                 , _msgEphemerisGps_af1      =       (-43) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_af1)+                 , _msgEphemerisGps_af2      =       (-55) ## (m ^. msg1019_ephemeris ^. gpsEphemeris_af2)+                 , _msgEphemerisGps_iodc     =                 m ^. msg1019_ephemeris ^. gpsEphemeris_iodc+                 , _msgEphemerisGps_iode     =                 m ^. msg1019_ephemeris ^. gpsEphemeris_iode+                 , _msgEphemerisGps_toc      = toc+                 }+  yield [SBPMsgEphemerisGps m' $ toSBP m' 61440]