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