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Integrated masts – The next generation design for naval masts
Posted on August 28, 2015 by N.R.P
SUMMARY
The best position for a sensor on a ship, is on top of the highest mast. Multiple sensors mean multiple antennas; hence ending up close together. Such an arrangement requires the need to switch one system off before another one can be used. As all sensor systems are installed separately on the ship, and then subsequently integrated and tested, they add considerably to the time and cost required for building a naval vessel.With recent development of integrated masts for warships, gone are the dozens of antennas and sensors found on practically every flat topside surface of a modern naval vessel.
These integrated masts allow the exploitation of modern materials and technology to improve sensor performance and coverage with pre-outfitting, leading to reduced cost of construction due to reduced time overruns. This article, by Commander Nitin Agarwala, who is now a contributing author for Defencyclopedia, explores the developments in integrated mast design for integration of electronic warfare (EW),communication and Radar and their future in warship construction.
INTRODUCTION
How does an antenna become designated for use in navigation, weapon fire control, communications, electronic countermeasures or for any other reason, and ultimately installed on board a Naval surface ship? The answer should be, it’s part of the antenna design procedure. Though the answer is simple, the process is not. There was a time, when this design procedure, referred to as dart-boarding, was based on an educated guess for the most feasible layout of the antennas, followed by experimental verification.
The multiple mast and cluttered antenna layout on a 1970’s era Soviet Kashin class destroyer
As the reliance on electronic systems such as communications, radar,navigation, gunfire control, friend-or-foe identification, electronic countermeasures, and aircraft operations increased, one realized that complex, intricate below-decks electronic equipment was virtually useless unless matched with satisfactory antenna performance. Hence former methods of antenna design and topside arrangements were no longer adequate and dart-boarding disappeared – to be replaced by careful scientific planning. These electronic systems divided the shipboard antennas into three broad groups.
Clustering of so many antennas in so little space,plus the necessity for simultaneous emission and reception together with the undesirable, but unavoidable, electromagnetic coupling to, and re-radiation from, a host of other shipboard metal objects, results in a most trying system integration problem for the ship. Strenuous efforts must be made to reach a compromise with all competing topside subsystems so as to provide the least degradation in overall performance.
TYPES OF MASTS
To meet the requirement of these sensors, the Naval Architects have hence used
Lattice masts
Mack ( Mast + Smokestack)
Pole masts
Tripod mast
Enclosed mast
The various types of masts have been a result of changing requirement of the navies and the developing technology used over the years. Of all these masts, a plated mast, even with a higher weight than a lattice mast, is preferred in most cases due to its advantages of lower radar cross-section, improved through life maintenance (due to enclosed structure), lesser vibration and ability to handle larger weight of modern equipment.
Note the blackening of the area around the radars on the mast
blems associated with ships.
Posted on August 28, 2015 by N.R.P
SUMMARY
The best position for a sensor on a ship, is on top of the highest mast. Multiple sensors mean multiple antennas; hence ending up close together. Such an arrangement requires the need to switch one system off before another one can be used. As all sensor systems are installed separately on the ship, and then subsequently integrated and tested, they add considerably to the time and cost required for building a naval vessel.With recent development of integrated masts for warships, gone are the dozens of antennas and sensors found on practically every flat topside surface of a modern naval vessel.
These integrated masts allow the exploitation of modern materials and technology to improve sensor performance and coverage with pre-outfitting, leading to reduced cost of construction due to reduced time overruns. This article, by Commander Nitin Agarwala, who is now a contributing author for Defencyclopedia, explores the developments in integrated mast design for integration of electronic warfare (EW),communication and Radar and their future in warship construction.
INTRODUCTION
How does an antenna become designated for use in navigation, weapon fire control, communications, electronic countermeasures or for any other reason, and ultimately installed on board a Naval surface ship? The answer should be, it’s part of the antenna design procedure. Though the answer is simple, the process is not. There was a time, when this design procedure, referred to as dart-boarding, was based on an educated guess for the most feasible layout of the antennas, followed by experimental verification.
The multiple mast and cluttered antenna layout on a 1970’s era Soviet Kashin class destroyer
As the reliance on electronic systems such as communications, radar,navigation, gunfire control, friend-or-foe identification, electronic countermeasures, and aircraft operations increased, one realized that complex, intricate below-decks electronic equipment was virtually useless unless matched with satisfactory antenna performance. Hence former methods of antenna design and topside arrangements were no longer adequate and dart-boarding disappeared – to be replaced by careful scientific planning. These electronic systems divided the shipboard antennas into three broad groups.
- Omni-directional antennas – used mainly for communications, air navigation, and passive reception. These satisfy the need of ships and aircraft to maneuver independently of each other and fixed radio stations.
- Directional antennas – used for transmitting and receiving spatially concentrated energy in one direction at a time. These are used for radar, gunfire control, and satellite communication to obtain information about or from remote objects.
- Directional antennas – used to determine bearing of incident radiation; and is used primarily for direction finding navigation and Electronic Countermeasures (ECM).
Clustering of so many antennas in so little space,plus the necessity for simultaneous emission and reception together with the undesirable, but unavoidable, electromagnetic coupling to, and re-radiation from, a host of other shipboard metal objects, results in a most trying system integration problem for the ship. Strenuous efforts must be made to reach a compromise with all competing topside subsystems so as to provide the least degradation in overall performance.
TYPES OF MASTS
To meet the requirement of these sensors, the Naval Architects have hence used
- Pole masts
- Tripod masts
- Lattice masts
- MACK (Mast-Stack) masts
- Enclosed masts
- Solid masts
Lattice masts
Mack ( Mast + Smokestack)
Pole masts
Tripod mast
Enclosed mast
The various types of masts have been a result of changing requirement of the navies and the developing technology used over the years. Of all these masts, a plated mast, even with a higher weight than a lattice mast, is preferred in most cases due to its advantages of lower radar cross-section, improved through life maintenance (due to enclosed structure), lesser vibration and ability to handle larger weight of modern equipment.
Note the blackening of the area around the radars on the mast
blems associated with ships.
