About Furuno-Marine-RadarWhat Everyone Ought to Know About Furuno-Marine-Radar RADAR is an acronym for RAdio Detection And Ranging. Radar can be defined as a method of locating the presence of a target, and calculating the range and angular position with respect to the radar transmitter. For closing landfalls, navigating channels and poor visibility, radar units make navigation a lot easier. There are some very confused attitudes around that see radar as redundant with the GPS. Radar indicates where things are, and GPS indicates where you are. As a navigational aid, radar offers many very useful functions: 1. Position fixing from geographical points. 2. Positions of other vessels. 3. Positions of buoys. 4. Land formations when trying to make a landfall in poor visibility. 5. Rain and squall locations. 6. Collision avoidance at night and in poor visibility. What Everyone Ought to Know About Furuno-Marine-Radar Radar transmits a pulse of Radio Frequency (RF) energy. This is radiated from a highly directional rotating transmitter called the scanner. Any reflected energy is then received and processed to form an image. The time interval between transmission of the signal and reception of reflected energy can be processed to give target distance and bearing. The subject of radar reflection theory is complex and is covered extensively elsewhere. It is essential that behaviour of radar signals on varying target materials be understood if radar is to be fully utilised. What Everyone Ought to Know About Furuno-Marine-Radar In practice the longer the scanner the narrower the beam width, which gives better target discrimination. Of the two main scanner types, beamwidths of enclosed scanners are always larger than open types. This factor is one of the trade-offs that has to be considered when selecting a radar unit. If it can be accommodated, an open scanner is far more preferable in terms of performance. The are two physical scanner types in common. What are the Scanner Types? Enclosed array type scanners are commonly installed. There are two basic types of antenna elements in use: 1. Printed Circuit Board. Printed circuit board phased antenna arrays are commonly fitted to enclosed scanners. The antenna is on a circuit board instead of the more expensive slotted waveguides. 2. Slotted Waveguide. Center fed slotted waveguide arrays are normally used on open array antennas and on larger range radomes.
The latest edition of The Marine Electrical and Electronics Bible is out now, fully revised and updated with all the latest technology
Need more information? then why not go to Amazon and get one of my books to keep on board for easy reference, why not try one of the easy Understanding Electronics or Understanding Communications
Click on this link to find out more about Yachting and Sailboats All About Marine Electronics and all you need to know. |