Radar Beacon Systems Explained

Radar beacon systems are used for navigation and surveillance, and they work by transmitting a signal that is received and interpreted by a radar system. This signal is typically a series of pulses that are emitted at regular intervals.

The frequency of these pulses can be adjusted to suit different applications, such as air traffic control or maritime navigation. Radar beacons can be used to provide precise location information, even in areas with limited visibility.

Radar beacons are often used in conjunction with other navigation systems, such as GPS, to provide a more accurate and reliable location. This is especially important in areas where GPS signals may be weak or unreliable.

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The principle of operation for Enhanced RACON is to further modulate the first dash with digital information.

This digital information can either identify the RACON uniquely or its position.

The unique identification would enable enhanced RADAR positioning by correlating the radar response with the known position of the RACON.

This can be achieved through an associated AIS signal representing the same object with the same identifier.

In the future, this information could also be derived from electronic navigational charts in the emerging S-100 format.

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Racon systems used by the USCG are frequency agile, designed to measure the frequency of every incoming radar pulse.

All racons operate over the frequency range 9300-9500 MHz marine radar band (X-band), and most also operate in the 2900-3100 MHz marine radar band (S-band).

The Morse-encoded response from a racon is encoded such that the length of one dash is equal to that of three dots, and the length of one dot equals that of one space.

Racon range is approximately line-of-sight, normally over 15 nautical miles, but actual range depends on factors like mounting height and atmospheric conditions.

S-band racon antennas should be suitable for responding to radars using both horizontal and vertical polarization.

X-band racons should respond to radars using horizontal polarization only.

X-band antenna vertical divergence ranges from about 8 degrees for fixed installations, to 18 degrees for installation on buoys.

S-band antenna vertical divergence is 22 degrees.

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Radiated power from a racon is 600 milliwatts.

Receiver sensitivity is about -35 dbm.

Older racons, no longer used by the USCG, operate in a slow sweep mode, slowly sweeping through the 9300-9500 MHz band every 1 to 2 minutes.

The response from most slow sweep racons is visible on a radar display for only about 5% of the time.

Racon is a radar transponder that receives and transmits data using Morse code, making it a valuable tool for mariners to identify the location of fixed or floating Aids to Navigation.

The IMO refers to Racon as radar transponders, and they are used by ports and harbour authorities to help mariners easily identify the location of critical assets such as lighthouses or large navigational buoys, landfall and obstructed coastlines, offshore platforms and structures, and leading lines.

Racon transmission is extremely accurate and of great assistance to mariners on approach, appearing alongside other radar signals on the bridge of the ship to help the mariner make navigational decisions.

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The primary benefit of using Racon is its availability, transmitting in almost any type of weather, unaffected by fog or poor weather and sea conditions.

Racon range is line-of-sight, typically greater than 15NM, and is substantially longer than your typical Aid to Navigation.

The technical parameters of a Racon are the antenna, receiver, transmitter, and response, including delay after receipt, identification coding (Morse letter), and duration.

A Racon is normally battery powered (12V) and recharged by solar panels, and is easy to program onsite via connection to the RS232 communication port using a laptop computer.

Here are the technical parameters of a Racon:

Racon is a highly responsive, single piece device that transmits to the more common X-band (10GHz) and/or S-band (3GHz) frequencies for more specialized applications.

Radar beacons have specific requirements to ensure they function correctly and provide accurate information to vessels.

The RACON must be an FCC-accepted RACON or a similar type.

To transmit a signal, the RACON must be able to radiate at least 250 milliwatts of power in an omnidirectional pattern, polarized in the horizontal plane.

The RACON must also transmit a two-element or more Morse code character that doesn't exceed 25 percent of the radar range expected to be used by vessels in the area.

Frequency agile RACONs must respond at least 40 percent of the time, but not more than 90 percent of the time, with a response-time duration of at least 24 seconds.

All RACONs used by the USCG are frequency agile type, designed to measure the frequency of every incoming radar pulse and transmit a response back to the radar on that frequency.

The Morse-encoded response is encoded such that the length of one dash is equal to that of three dots, and the length of one dot equals that of one space.

Here are the key technical characteristics of RACONs:

The RACON must also be located at a minimum height of 15 feet above the highest deck of the platform, and the structure of the platform or equipment mounted on it should not obstruct the signal propagation in any direction.