Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Directional Finder(DF)

Directional Finder(DF)

Directional Finder(DF)

I wanna some information about how Directional finders
works. As I know Directional Finder is a kind of radar
that can find the direction of none-line-of-sight targets.


RE: Directional Finder(DF)

Suggestion: Visit
Essentially, it depends on nature of targets, what they transmit (if anything), etc. If it is a flying object without much of emission, then you need a radar to track and calculate its position. Some radars operate within the line-of-sight, others over the horizon. The latter one need to transmit and receive refletected waves. Visit
for more info on a troposcatter

RE: Directional Finder(DF)

You are right, it can seem as special radar and it just detect the direction only not the distance and range.

The operation theory is also not different than Radar. Most of the Radar transmits a narrow beam of energy to space and record the time when it bounces back. The direction information will be determined by the angle it transmit the energy. The DF may not have the transmitter or the transmitter is in the other unit or just passive receive.

Jbartos' web pages are very good to explain the passive receive DF. To work as a special application, some special technique can use for good performance DF than the traditional Radar design like use 4 antennas and compare the signals to get the direction information. You can find the antenna design in the web page from Jbartos as an example.

I just know the DF used in military like missile seeker, electronic warfare. May be you can use it in the commercial navigation system.

RE: Directional Finder(DF)

1. One frequent commercial application of the DF is locating someone in distress, e.g. ship, person, etc.
2. Other is a guidance.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close