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Net_Diff

Net_Diff is a software for GNSS Download, Positioning and Analysis.

It supports functions of SPP/PPP/DSPP/DPPP/RTK/PPP-RTK, it can also applied in SPP/PPP with BeiDou augmentation information.

It supports data analysis, including coordinate plotting, positioning error comparison, satellite number, PDOP, satellite skyview, satellite visibility, cycleslip, troposphere, ionosphere, observation minus correction, positioning residuals and so on.

It provides IGS data and products download.

It can also support orbit simulation.

It also provides some useful tools such as time and coordinate system transfer, RINEX edit, RTCM3 and raw data convert, RTCM3 receiving.

How to install:

  1. Install gzip

    Click gzip-1.3.12-1-setup.exe and install gzip. 

For example, after install it, gzip.exe is under C:\Program Files (x86)\GnuWin32\bin\

  2. Install Net_Diff

    a) If you have installed MATLAB R2017a or MATLAB Runtime version 9.2 (R2017a) in your computer.

    Open /for_redistribution_files_only/ and click Net_Diff.exe

    b) If not.

    Open /for_redistribution/ and click Net_Diff_Installer_web.exe to install MATLAB Runtime and Net_Diff.exe

Please keep your computer connected to internet while installing.

It will take a few minutes to download MATLAB Runtime, please be patient.

If error occurs in downloading MATLAB Runtime 9.2, please download or update it by hand from:        
https://ww2.mathworks.cn/products/compiler/matlab-runtime.html

After finish installing, you can find the execute file from the installed program directory, like C:\Program Files\Net_Diff\application\. 

!!!!!!!If your Windows OS is under C:\, Net_Diff may can’t read and write files under C:\. In this case, it is recommended to copy C:\Program Files\Net_Diff\application\ to other drive!!!!!!!!!

  3. Complete Full Installation

Copy C:\Program Files (x86)\GnuWin32\bin\gzip.exe to the directory of Net_Diff GUI.

  • When use the software, please open it from execute file, not from Windows Start.

  • As for the use of Net_Diff, please refer to the guide document "A guide to use Net_Diff.pdf".

  • Source code is under the src branch.

If you have any questions or problems in using Net_Diff, please contact me: zhyize@163.com



Revision History:

V1.0

2018/07/24

  1. Modify GUI in Analysis panel

  2. Modify RTK fix and hold mode

  3. Change GLONASS satellite number from 24 to 27

2018/07/25

  1. Modify ISB model in PPP

  2. Fix bugs of BeiDou PCO

2018/07/26

  1. Fix bugs in GUI

2018/08/09

  1. Modify GUI

  2. Change selecting reference satellite method

  3. Change settings in long baseline RTK

2018/08/17

  1. Use traditional KF algorithm in long baseline RTK and change some settings

  2. Modify Galileo F/Nav and I/Nav broadcast ephemeris selection

  3. Add GLONASS in RTK float solution

2018/08/21

  1. Change default ratio from 3 to 2

  2. Fix bug of static long baseline RTK

2018/08/22

  1. Fix bugs in GUI

2018/08/24

  1. Change coordinate variance to 60m, modify outliers detection

  2. Change troposphere constraint in long baseline RTK

2018/08/26

  1. Modify partial AR

2018/08/27

  1. Change settings for long baseline RTK

2018/08/30

  1. Change selection of reference satellite in RTK

  2. Improve outlier detection in RTK

  3. Change Galileo max satellite number from 31 to 36

2018/09/03

  1. Modify GUI

2018/09/06

  1. Fix bugs in GUI

  2. Add GPS L2C observation

V1.1

2018/09/13

  1. Fix bugs when there are too few satellites while cycle slip in RTK

  2. Support Doppler selection in GUI

2018/09/16

  1. Support RINEX editing in GUI, modify GUI

2018/09/18

  1. Support Time and Coordinate Transfer in GUI.

  2. Support command line file input function for Net_Diff.

V1.2

2018/09/28

  1. Fix bugs in static SPP

  2. Fix bugs in GUI

  3. Support multi-GNSS tight combined RTK

  4. Support posfile output available for RTKPLOT.

  5. Support Coordinate.txt appended after Control.txt

2018/09/29

  1. Fix bugs in BDS WADS PPP mode

  2. Modify GUI

2018/10/12

  1. Fix bug in BeiDou PCO of C13 for gbm

  2. Modify tightly combined RTK

  3. Modify GUI

V1.3

2018/10/17

  1. Support GLONASS AR in tightly or loosely combined RTK

  2. Modify tightly combined RTK

  3. Support Android raw data convert to RINEX

  4. Modify GUI

2018/10/20

  1. Fix bugs in non-L1L2 combination when using clock from sp3 file

  2. Fix bugs tightly combined RTK

2018/11/08

  1. Fix bugs of single system SPP when ISB setting is true

  2. Fix bugs of SPP for outlier detection

  3. Fix bugs of PCV correction for Galileo and QZSS

  4. Fix bugs of loosely combined GLONASS RTK

  5. Change maximum time difference of RTK to 30s

  6. Modify GUI

V1.4

2018/11/16

  1. Support mix-frequency combination on each satellite system (only available in GUI)

  2. Support mix-observation combination on each satellite system (only available in GUI)

  3. Support PPP-AR (only available in GUI)

  4. Support undifferenced uncombined PPP (only available in GUI)

  5. Add output of ionosphere correction in uncombined PPP

  6. Add phase windup correction in RTK

  7. Reduce matrix size to improve processing efficiency

  8. Changeable cycle slip detection threshold

  9. Fix bug in LAMBDA

  10. Fix bug of Galileo PCO correction

  11. Modify GUI

2018/11/19

  1. Support triple-frequency undifferenced uncombined PPP (only available in GUI)

  2. Change ionosphere initial value of undifferenced uncombined PPP

  3. Fix bug of ionosphere correction when frequency combination is L2L3

  4. Fix bug when cycle slip method is only LLI in RTK

  5. Modify GUI

V1.5

2018/12/14

  1. Support PPP-RTK (CLAS) (Authorized)

  2. Change output file name for better parallel computing

  3. Change threshold of outlier detection

  4. Fix bug of IRNSS frequency

  5. Modify GUI

2018/12/26

  1. Support triple-frequency ionosphere-free PPP (only available in GUI)

  2. Support Android dual-frequency multi-GNSS raw data converted to RINEX

  3. Fix bug of BDS PCO using new atx file in triple frequency PPP

  4. Turn off time restriction of BSX file

2018/12/27

  1. Change maximum BeiDou satellite PRN to 37

  2. Fix bug of satellite orbit value in sp3 file when it is 0.000

V1.6

2019/01/25

  1. Support new signal of BDS (B1c/B2a) and GLONASS (G3), Galileo(E6), QZSS(L6)

  2. Fix bug of doppler aided SPP/PPP

2019/02/04

  1. Support user self-named file selection in GUI

  2. Fix bug of GLONASS AR

  3. Speed up efficiency of matrix inversion and least square solution.

2019/02/14

  1. Add SNR depended stochastic model

  2. Change elevation depended stochastic model in RTK, change phase noise from 1cm to 3mm

  3. Fix bug of doppler aided RTK

  4. Modify GUI

V1.7

2019/02/25

  1. Support network PPP solution (Authorized)

  2. Support loosely coupled PPP/INS and RTK/INS (Authorized)

  3. Add threshold of success rate in AR

  4. Add data-based and model-based combined AR

  5. Fix bug of DCB correction for different frequency combination

2019/02/27

  1. Add ionosphere compensate in long baseline RTK

  2. Use I/Nav when F/Nav is unavaliable for Galileo

2019/03/08

  1. Modify stochastic model of observations

  2. Add DCB correction of L2C observation

2019/03/13

  1. Add forward and backward combined RTK

  2. Fix bug of GLONASS velocity calculation

  3. Add ionosphere process noise setting in long baseline RTK

  4. Fix bug of GBM products download error

  5. Fix bug of uncombined PPP

2019/03/20

  1. Modify tightly combined RTK

  2. Modify elevation depended stochastic model

  3. Fix bug of GNSS product downloading

2019/03/26

  1. Modify BDS3 PPP

  2. Fix bug of RTK

  3. Fix bug of BDS3 DCB correction

2019/04/04

  1. Fix bug of GLONASS IFB estimation in PPP

  2. Modify EOP value selection and polar tide correction model

  3. Change time difference tolerance of navigation ephemeris

  4. Add WL elevation cutoff setting in RTK

  5. Change ionosphere constraint and initial covariance in long baseline RTK

  6. Modify GUI

2019/04/07

  1. Change code and phase raw measurement noise to 0.3/0.003m

  2. Improve PPP performance in severe environment

2019/04/09

  1. Add QZSS code DISB estimation

  2. Correct QZSS 1/4 cycle bias for Trimble receiver

  3. Don't estimate GLONASS phase DISB when not fix GLONASS ambiguity

V1.8

2019/04/15

  1. Support SSR correction in SPP/PPP

  2. Support receive RTCM message from Ntrip (Adapt from goGPS)

  3. Support dump RTCM SSR and conversion of various type of raw data to RINEX (Adapt from RTKLIB)

  4. Change satellite velocity in ECEF

2019/05/16

  1. Fix bug of receiver type checking

  2. Fix bug of non-GPS non-L1L2 frequency DCB correction

  3. Fix bug of real-time broadcast ephemeris downloading

  4. Fix bug of using Wuhan ultra-rapid multi-GNSS products

  5. Fix bug of GLONASS IFB estimation in multi-GNSS PPP

2019/05/22

  1. Fix error of BDS observation data in RINEX 3.04 for JAVAD receiver

2019/06/07

  1. Change BDS-3 PCO value

  2. Fix bug of undifferenced uncombined PPP in troposphere variance setting

  3. Outtput total slant ionosphere delay rather than ionosphere correction

  4. Resort broadcast ephemeris and delete dumplicated BDS ephemeris

2019/06/20

  1. Change PCO value of BDS GEO satellites when using new antenna file

  2. Fix bug in reading RINEX 2 observation file

  3. Change ionosphere covariance in single frequency SPP or Graphic PPP

2019/07/05

  1. Fix bug of triple-frequency PPP

2019/07/18

  1. Fix bug of Kalman Filter in RTK

  2. Delete incorrect BDS ephemeris

V1.9

2019/07/28

  1. Support DCB estimation

  2. Surport barycentric based net solution

  3. Fix bug of PPP-RTK(CLAS)

  4. Support CLASLIB

2019/10/19

  1. Seperate GPS and QZSS in RTK

  2. Fix bug of satellite velocity in SSR based PPP

  3. Change BDS PCO

  4. Fix bug of PPP ambiguity re-initialization in outlier detection

  5. Fix bug of cycle slip detection in P1L1 method

  6. Fix bug of initial coordinate error in Bancroft

  7. Fix bug of ionosphere estimation when only psudo-range observation

2019/11/22

  1. Fix bugs of tgd correction in using BDS B1c and B2a signal

  2. Fix bug of reading RINEX observation data when clock offset is larger than 0.01 s

  3. Fix bug of BDS satellite type classification

  4. Change BDS maximum satellite PRN to 38

  5. Change QZSS PCO when using gbm products

  6. Fix bug of ionosphere output

  7. Fix bug of receiving RTCM message

V1.10

2019/12/07

  1. Support satellite orbit simulation

  2. Surport ublox for PPP-RTK(CLAS) (Tolerance of time difference and Galileo E5b)

  3. Fix bugs of plotting

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Net_Diff is a software for GNSS Download, Positioning and Analysis.

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