pysbf

A Python module to read "Septentrio Binary Format" (SBF) files generated by Septentrio receivers.

Dependencies

Required:

A C compiler (GCC preferred).
Python 2.7+ (Make sure your C compiler can find the Python API "Python.h" header file)

Optional:

Cython v0.19-dev+

Installation

A Python distutils setup.py script is included. Run this script with the Python interpreter you would normally use.
For example,

python2 setup.py build
python2 setup.py install

Release Notes

Up to 100x times faster parsing (than pure Python, thanks to Cython). Python module is written in C and complied for C-like speeds.
All blocks documented in documentation v1.13.0 are now supported.

Usage

The basic function of this module is to parse every block inside a SBF file into a map. Therefore, the dict built-in Python object is used to represent each block.

Functions

`load(f_obj, limit=-1, blocknames=set())`:

Returns a iterator/generator of SBF blocks.
f_obj should be a file object.

By default every type of block is generated, however most of the time only certain types of blocks are needed. This can be accomplished by providing a set of block names to the blocknames parameter.

limit limits the number of blocks generated.

Examples

Print the block name for the first 100 blocks:

import pysbf
    
with open('./dummy.sbf') as sbf_fobj:
 for blockName, block in pysbf.load(sbf_fobj, limit=100):
  print blockName

Print the azimuth & elevation for each visible satellite using the first 100 SatVisibility blocks:

import pysbf
    
with open('./dummy.sbf') as sbf_fobj:
 for blockName, block in pysbf.load(sbf_fobj, limit=100, blocknames={'SatVisibility'}):
  for satInfo in block['SatInfo']:
   print satInfo['SVID'], satInfo['Azimuth'], satInfo['Elevation']

Combine with matplotlib & numpy for plots. A simple plot of CPU load vs time using the first 100 ReceiverStatus blocks:

import matplotlib.pyplot as plt
import numpy as np
import pysbf as sbf
    
with open('./dummy.sbf') as sbf_fobj:
 cpuload = ( '{} {}\n'.format(b['TOW'], b['CPULoad']) for bn, b in sbf.load(sbf_fobj, 100, {'ReceiverStatus_v2'}) )
 data = np.loadtxt(cpuload)
 plt.xlabel('Time (ms)')
 plt.ylabel('CPU Load (%)')
 plt.plot(data[:,0], data[:,1])
 plt.show()

Issues/Errors

File a issue on github @ https://github.com/jashandeep-sohi/pysbf

jashandeep-sohi/pysbf