What type of radar that detects a SART?
What type of radar that detects a SART?
9 GHz X-band
A SART will only respond to a 9 GHz X-band (3 cm wavelength) radar. It will not be seen on S-band (10 cm) or other radar.
What is the purpose of radar in functioning of SART?
These signals are known as homing signals. The response is usually displayed on radar screens as a sequence of dots on an X band-radar, which helps rescuers reach the vessels in time.
How do I maximize SART range?
To achieve the maximum detectable range the SART should be mounted vertically at least 1 m above sea level. Increasing the height of the SART will increase its detectable range. This is because the radio waves it transmits use line of sight transmission.
What is the frequency of SART?
9200 to 9500 MHz
Specifications / Components
| FREQUENCY RANGE | 9200 to 9500 MHz |
|---|---|
| TEMPERATURE RANGE | Operating : -20degC to +55degC Ambient : -30degC to +65degC |
| ANTENNA BEAMWIDTH | Vertical : ± 12.5 relative to the horizontal plane of the SART |
| Azimuth | Omnidirectional |
On what frequencies does SART uses?
A SART operates in the 9 GHz (3 cm or ‘X-band’) radar frequency band and, on receiving a signal from a ship or aircraft radar, transmits a series of response (homing) signals. The SART can be activated manually or automatically (in some cases) so that it will thereafter respond when interrogated.
What type of antenna is used in SART?
These arcs increase in size if the vessel gets closer. If the rescue vessel is very close, the SART will be activated permanentely by the side lobes of the radar antenna. The signal of the SART will then be visible as twelve complete circles on the radar screen.
What is SART standby mode?
If no radar pulse is detected for a period of approximately 15 seconds, the SART automatically returns to the standby mode to await further interrogation. Most SART models are also equipped with a light and buzzer that will activate when interrogated alerting you that it has picked up a radar pulse and is responding.
How is SART activated?
The SART is activated manually and hence response only when interrogated. When activated in distress situation SART response to a radar interrogation by transmitting a signal which generates 12 blips on the radar and turns into concentric circles as the range between the two reduces .
What does SART signal look like?
A SART has a receiver that detects the signals from X-band radars (9.2 – 9.5 GHz). If the SART detects a signal it immediately transmits twelve pulses on the same frequency. This signal is seen by the radar as “echoes” and will be displayed on the screen as a serie of twelve dots with a gap of 0.6 miles between them.
How many types of SART are there?
(2)
They are designed to be used on board any vessel; ship, boat, or survival craft. There are (2) types of Search and Rescue Transponders, the “Radar SART” and the “AIS SART.” We will be discussing the Radar SART since it is the most common found on board smaller as well as non-commercial vessels.
What is a Sart on a radar?
On a radar, SARTs change their appearance as you get closer to them. Initially, a SART will be a series on 12 dots, spaced about 0.6M apart. The echo closest to the centre of the screen is the true location of the SART, and the echos extending away from it are the additional, generated echos.
What is not a good radar reflector?
Some obstacles are not good radar reflectors, such as plastics, dry wood, or objects with large flat surfaces that can reflect signals away from the radar antenna. Possible obstacle detection ranges for a radar-based proximity warning system vary from less than a meter to 30 m or more.
When to use X-band radar for detection of Sarts?
When the range is such that only the slow sweep responses are seen (range approximately greater than 1 n mile), the first dot of the SART response displayed will be as much as 0.64 n miles beyond the true position of the SART. IMO Safety of Navigation Circular 197 provides guidance on using X-band radar for the detection of SARTs.
What is an active radar reflector?
Active radar reflectors are increasingly fitted to small vessels to replace passive radar reflectors. They have the advantage of being small in size and of low weight, and so are easily positioned towards the highest point of the vessel, including the mast-top of a yacht.
