Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt
Blattenberger

... single-
handedly
redefining
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

Data Acquisition System - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: Data Acquisition System
Posted: Tue Aug 31, 2010 10:01 pm 
 
Lieutenant

Joined: Sun Jul 11, 2010 1:16 pm
Posts: 2
Hey guys,

Not sure if this is the best place to ask this question since this is kind of 'software' related. But since it is for an RF application and you guys might have had experience with it, I am hoping you can help me out.

I am just starting out as a student and as part of my project work, I am supposed to complete a Data Acquisition System for a commercially available digital receiver, all in Linux. I completed the driver development part for the digital receiver. But I am still struggling with the rest - the actual data acquisition program, what do headers mean, what information they convey, how are they supposed to be programmerd, how to build a GUI and a software scope for the data. I have no prior experience in coding for any of these requirements. Kindly help me out - I do not want any direct answers or cookbook recommendations but a general direction in which I should proceed and the concepts I need to learn to eventually be able to complete the task.

Thanks!


 
   
 
 Post subject: Re: Data Acquisition System
Posted: Wed Sep 01, 2010 11:43 am 
 
Colonel

Joined: Tue Apr 11, 2006 8:13 pm
Posts: 39
Hi Sandeep,

Without knowing much about the application, here are some things that you would want to look at. From your description, it looks like you are building a software interface to communicate with and acquire digitized data from some source.

Here are some things that I would look to do before you start writing code:

1. Write down all the functions you need the software to perform. Once you identify the functions, does there have to be a sequence for these functions, or are they user (or event) driven.

2. Is there a control signal that is used to start/stop acquisition. If so, where does that signal originate - is it a user input or is it from another piece of hardware. If it is hardware, does your code have to control that piece as well.

3. Identify the outputs you need to display. And the source of these outputs. What is the type of display you need for each data type.

Create a flow chart and identify as many pieces of the process as you can. Identify the relationships between different sections if any. That should get you started. Once you have that figured out, then you can look at implementing each block of the flowchart probably as modules and tie them all together, reusing as many blocks as you can.

To answer your question on the header, in a lot (most) of cases, the header section of the data packet consists of information that is needed to parse the rest of the packet. Headers can contain start bits (or characters/sequences of characters) to identify start of a packet, number of bytes being transferred, timestamps, etc. There is no fixed definition for headers, unless your packet structure conforms to a particular protocol. If you are defining your own packet structure, the header is up to you.


Karthik


 
   
 
 Post subject: Re: Data Acquisition System
Posted: Wed Sep 01, 2010 8:48 pm 
 
Lieutenant

Joined: Sun Jul 11, 2010 1:16 pm
Posts: 2
Thanks Karthik!

That helps! I will get started on that and post updates and if necessary ask further questions!





Posted  11/12/2012
A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel