Direction finding (DF), or radio direction finding (RDF), is the use of radio waves to determine the direction to a radio source. The source may be a cooperating radio transmitter or may be an inadvertant source, a naturally-occurring radio source, or an illicit or enemy system.

Established in 1981, Doppler Systems designs and manufactures fixed site and mobile radio direction finders and radio direction finding (RDF) systems. We provide RDF equipment and software for government, commercial, and amateur users.

RDF Products designs and manufactures professional-quality radio direction finding (RDF) equipment for land-mobile, fixed-site, vehicle tracking and location, shipboard, and airborne radio direction finding missions.

HuntMaster expert system has built-in artificial intelligence aided Radio Direction Finding signal filtering providing mission aware assistance features. Packed in an easy to operate GUI makes HuntMaster the best option for efficiently operating advanced high precision RDF networks.

This whitepaper discusses the basic principles behind radio direction finding and the most commonly-used direction finding methodologies: manual angle of arrival (AOA), Doppler, Watson-Watt, correlative interferometry (CI), time difference of arrival (TDOA), and hybrid methodologies.

2020年11月19日 · Direction Finding or radio direction finding (RDF) is the process of determining the direction and origin of an RF signal. This can be done for any mode of wireless communication such as radios, radar signals, drone remote controllers, monitoring (ELINT/SIGINT) etc.

The direction finder takes spatial and temporal samples from this wave front and estimates azimuth and elevation values for the most probable direction of the emitter. Understanding the factors that influence direction finding is important.

2020年6月30日 · Radio direction finders calculate the direction to a radio transmitter by analyzing the signal as it reaches the antenna. A single direction finder can determine a line of bearing toward the transmitter; multiple direction finders can …

2015年11月27日 · The Stealth DDF2020T/GPS is an economical but very sophisticated Doppler Direction Finder with GPS and can connect a PC or Laptop, to position and draw plots on GoogleEarthTM display window accompanied with “Navi 2020” plotting program.

2025年3月4日 · Recently, on Feb 21, we posted news about the release of some spectrum analysis and FM demodulator software from M. Khanfar. Now he has just released his latest software 'Khanfar Direction Finder' (scroll to the end of the page), a Windows radio direction finding tool for RTL-SDR dongles. Khanfar Direction Finder appears to work on the principle of …

The Hammerhead is an automatic radio direction finder, or RDF. It is the most sophisticted easiest to use direction finder for PLBs, EPIRBs and beacons transmitting 121.5MHz

This page collects various theory and projects related to Radio Direction-Finding, both antennas and other equipment. Directional Antennas for RDF discusses different types of antenna systems and what factors are most important when using them for direction-finding.

A radio direction finder allows users to pinpoint RF signal interference. To optimize reception, radio direction finders show the type and cause of the interference. Adjustments can then be made, reducing safety risks.

We design and manufacture radio direction finding antennas for finding missing aircraft, search and rescue, and amateur radio fox hunts.

We offer a mobile radio direction finder (RDF) covering frequencies from 100-1000 MHz. The mobile antenna uses roof-mounted summing units and four quarter wave vertical antennas. Our mobile radio direction finder is available as a packaged unit with everything needed for …

TRC 8210 MkII is a VHF / UHF direction finder that is capable for targets identification on radar display, search and rescue. It benefits from wide experience of THALES in radio direction finding for radio spectrum monitoring and electronic warfare.

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Tutorial on using radio direction finders to geolocate transmitters. For example, using single mobile, networked fixed sites, and mobiles. Error contours that result when 2 to 10 direction finders are located in a square coverage area.

How to know which direction to point your antenna? The TV Station Locator for Antenna Tool tool makes it incredibly easy to know which way to point your antenna to pick up the HDTV channel signals in your area.

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View a TV antenna tower map and technical signal information by zip code to determine signal strength and antenna selection. View a map of TV Antenna Towers and Transmitters in Oregon.