Applications Of Global Navigation Satellite System Information Technology Essay

Commercial usage of GPS has its roots in the predecessor plan, the Transit Satellite Navigation System. It was fielded by the U.S. Navy in the early 1960s and used by atomic pigboats to repair their places in the unfastened ocean. A orbiter came into position merely every 90 proceedingss ( about ) , so the system was non really utile to aircraft. Just as Navy ships were the primary users, big commercial vass besides became users as receiving system monetary values dropped. This bead was spurred by new emerging engineering and by the oil crisis of 1973. By so, equipment monetary values were in the $ 100.000 scope and could really be justified by big oil oilers as a cost beginning to wasted sand trap fuel caused by inaccurate pilotage. Then monetary values dropped even further, and big fishing vass became the turning market. This was accompanied by markets in land and ocean study.

When GPS constructs were being explored in the 1965-1973 clip frame as a solution for aircraft pilotage, US Congress demanded that in exchange for funding it, there would be two conditions: the GPS had to be a joint service plan and it had to hold a civil signal.

Equally shortly as there were GPS orbiters in the sky, there was a commercial market. The first orbiters were launched in the late seventiess and it became possible to happen one ‘s clip really accurately cognizing one ‘s location whenever a orbiter was seeable. With three orbiters in position, periods of planar placement and speed finding were possible. With four orbiters, this increased to three dimensions. As more orbiters were added, the day-to-day periods of good pilotage grew longer until full 24-hour coverage was achieved in the early 1990s. As GPS usage increased and engineering marched frontward, the monetary values of user equipment came down, fueling even greater use. The primary technological progresss that spurred this were large-scale incorporate circuits, massive microwave integrated circuits, heavy memory french friess, and microprocessors.

The first companies to offer commercial GPS merchandises were the same 1s developing military equipment ( e.g. Magnavox and Rockwell Collins ) . Magnavox developed the first GPS. It was a sequencing receiving system and could manage low flight kineticss. It was tested by NASA and the FAA. Another early civil GPS developer was Trimble Navigation. In Europe, THALES has a significant GPS concern that developed internally and from acquisitions that day of the month back many old ages.

The established, public, pure GPS commercial companies Trimble, NovAtel, and GARMIN were joined on the stock market in 2004 by SiRF, which has been developing GPS chipsets since 1995.

Marine Navigation

While non the largest market section, marine pilotage was the first to encompass satellite pilotage. Today the market is maturating. Along with wirelesss and radio detection and ranging, a GPS receiving system is a piece of standard equipment on any boat runing far from shore. There are about 20 million boats in North America, and 50 million worldwide. Of these, about 98 % are pleasance trade. Commercial coastal and inland vass comprise about 1 million possible platforms for GPS, and there are more than 90.000 registered merchandiser vass worldwide, most of which are involved in fishing.

The International Loran Association estimates that there are presently good over one million Loran-C receiving systems installed in North America entirely. Most of these are in ships and boats, and all, shipborne or non, are campaigners for replacing with GPS.

The US Coast Guard ‘s system of differential rectification broadcasts has been widely accepted, and other states have similar systems, peculiarly in the North Sea and Norse Waterss. These systems provide truth in the 1m – 3m scope within about 150 stat mis of a rectification beacon, and they yield velocity over land ( SOG ) truth of about tenth part of a knot. This can be a benefit to commercial fishermen in supplying the ability to supervise little alterations in velocity caused by a dragged cyberspace ‘s snagging, leting rapid response to forestall serious harm. There is besides obvious application in sailing boat and yacht racing for this sort of velocity truth. The combination of SOG with air current velocity and velocity through the H2O gives information about set and impetus and evident air current velocity and way. Accurate velocity of progress is besides available, helping the yachting tactician in happening the fastest path to the grade.

Ferries and sail lines are besides premier campaigners for accurate pilotage systems. There are about 1,000 ferries runing in North America and over 100 major sail ships. On any major sail ship you can normally see the span and see a overplus of GPS sailing masters, electronic chart shows, and other every bit impressive electronics. Since the foundation of the oil oiler Exxon Valdez in March 1989 and the ensuing oil-spill harm, there has been a time-tabled authorization to supply ADS capablenesss to all oil bearers utilizing the Port of Valdez in Alaska. Similar demands are found in other universe seaports. These systems derive a ship ‘s place from GPS and convey it via a wireless nexus to a control station on the shore. The ship ‘s place can so be monitored by the Coast Guard or other bureau and unsafe state of affairss can be alarmed and rectified. Because of the critical nature of this wireless nexus, and the development of new long-range communications engineerings, communications bearers such as INMARSAT are to a great extent involved in ADS systems and are the primary market for this placement engineering. Most of the universe ‘s 6,000 oil oilers are now fitted with GPS/ADS equipment.

Fisheries direction is a world-wide authorization necessitating fleet action by authoritiess when a sea boundary is intruded upon. Dwindling fish stocks have prompted the constitution of rigorous guidelines for fishermen and the closing of full evidences. The state of affairs is besides doing states that portion sea boundaries more and more sensitive to foreign fishing in their Waterss. These tensenesss engender the demand for accurate place finding and recording to turn out or confute a boundary misdemeanor. Many of the 40.000 North American-registered fishing vass, and those in most other states, are capable to compulsory ADS. Even where non mandated, the 45.000 vass that fish near international boundaries find it prudent to transport such cogwheel for their ain protection against false accusals.

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GPS can help in the berthing and moorage of big vass, by agencies of place, attitude, and heading mention systems. These installings use multiple aerials aboard the vas to find an accurate representation of the ship ‘s orientation. Combined with appropriate mention mapmaking, this can be an huge assistance in the handling of big vass in close quarters. The more than 800000 seagoing merchandiser vass worldwide are campaigners for this type of system. There is a market for highly accurate placement for seismal study and oil geographic expedition activities, every bit good as in dredging, buoy laying and care. There are about 2.500 dredges and 300 buoy stamps in operation around the universe. Dredge operators are paid based on the sum of stuff they remove from a seaport or transportation channel, so accurate measuring of place can optimise the operation, cut downing cost and wasted attempt.

The handiness of GPS and accurate DGPS has proven a blessing to the development of precise seismal maps and location of drill sites with regard to identified geologic construction, particularly in the offshore instance, where geographic expedition squads have paid important gross per twenty-four hours for accurate orbiter placement services. The handiness of such accurate systems for pilotage has enabled much resurveying of published marine chart information. A good part of the informations presently represented on Marine charts are more than 50 old ages old and hydrographic services are involved in the production of digital databases to an agreed-upon international format ( DX90 ) . This information is being used in a navigational assistance known as an Electronic Chart Display and Information System ( ECDIS ) . A typical ECDIS can be about $ 100.000 per installing and supply about independent operation of the vas. Simpler ECDIS installings bing from $ 4.000 to $ 10.000 are used chiefly as AIDSs to situational consciousness in concurrence with radio detection and ranging and ocular mentions. A 3rd category of Marine charting device is going really popular, due to really low unit cost. Sailing masters with simple constitutional or disc-updatable databases allow a vector map of a selected country to be drawn on a screen. These systems are first-class for supplying a grade of situational consciousness to a recreational leghorn, but in general are non certified for usage on commercial vass.

The rise of worldwide terrorist act has spurred the development of agencies of tracking of big container ships as they ply the seas. GPS plays an of import function in these sorts of systems, which besides rely on orbiter communications and electronic tagging.

Marine usage of GPS has been widely accepted, and differential services are good established. Recreational vass make good usage of basic GPS for pilotage, and the early credence of differential GPS bodes good for the wellness of that sector. The immense figure of vass and the value of GPS in marine pilotage, fishing, and waterway care, coupled with strong economic activity, will let steady growing to a degree of about $ 200 million yearly by 2008. This section, nevertheless, has a reasonably low growing rate due to the adulthood of the market.

Air Navigation

There are basically two sorts of markets and two governments of operation to see in the airborne country. There are 224.000 aircraft registered in the United States and Canada. The US-based Aircraft Owners and Pilots Association asserts that this represents 77 % of the universe aircraft population, so there would be an extra 67.000 in the remainder of the universe. These aircraft are in private owned by persons or companies for personal or corporate transit, or recreational flight. The 2nd class is the air bearer industry, which employs merely over 5.000 aircraft in North America and a similar figure worldwide. Both of these markets will hold a high demand for GPS as a long-range country pilotage system, since phaseout of current VOR and NDB pilotage AIDSs is slated to get down in 2010.

Loran-C provides effectual coverage over most of North America and coverage is turning in Northern Europe, the Middle East, and parts of Asia. Of class, none of these land-based systems can supply uninterrupted coverage over uninhabited or pelagic countries, as does GPS. For this government of pilotage, most transoceanic airliners presently rely on INS and GPS. GPS capableness is routinely installed in all new Boeing and Airbus aircraft.

In the GA aircraft market, Loran-C sailing masters used to rule, but incursion by GPS into this market is phenomenal, particularly as GPS-aided attack capabilities become standard at most landing fields.

GPS now provides commercial and GA airborne systems with sufficient unity to execute NPA. NPA is the most common type of instrument attack performed by GA pilots. The FAA has instituted a plan to implement NPA. This alleged sheathing plan allows the usage of a specially certified GPS sailing master in topographic point of a VOR or NDB receiving system to wing the conventional VOR or NDB attack. New NPA overlays that define waypoints independent of ground-based installations and that simplify the processs required to be flown are being put into service at the rate of about 500 to 1.000 attacks per twelvemonth and are about complete at the 5.000 public usage airdromes in the United States. Other states are implementing such processs, and there is about cosmopolitan credence of some kind of GPS attack capableness at most of the universe ‘s major airdromes.

In the executing of an NPA, the pilot or automatic pilot is given way to enable the aircraft to be maneuvered into the appropriate place for a descent toward the track. The descent is made with mention to an attack home base, which dictates minimal safe heights for each stage of the attack. Altitude information is provided by a separate instrument – a barometric altimeter. DGPS is required to supply the public presentation required for vertically guided attacks. Traditional class I, II, and III attacks involve counsel to the track threshold in all three dimensions. Local country differential corrections, broadcast from an airport-based GBAS mention station, are anticipated to run into all demands for even the most demanding ( category III ) attacks.

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In 2003, the FAA declared WAAS operational for instrument flight operations. WAAS broadcasts on the GPS L1 frequence, so signals are accessible to GPS receiving systems without the demand for a dedicated DGPS corrections communications link. The public presentation of this system is sufficient for NPA and new types of vertically guided attacks that are merely somewhat less rigorous than class I.

The GA market is seeing a rush of activity after publication of GPS NPA at the busiest airdromes and most of the others.

Land Navigation

By far, the most promising pilotage market for GNSS in footings of sheer size is for land pilotage merchandises. At the 2003 Civil GPS Service Interface Committee meeting, it was reported by the DOT that there are more than 420 million autos and 130 million trucks in the universe, with 150 million autos and 40 million trucks in North America. Initial usage of GPS engineering for land pilotage was for fleet trailing applications, but its usage for single vehicle pilotage is turning quickly. In 2004, there were about 8 million GPS receiving systems in cars in the United States. At that same meeting, it was forecast that safety betterments made via the application of GNSS engineerings will cut down the national one-year traffic decease rate to below 1 per 100 million stat mis driven, or about a 30 % decrease from current degrees.

The value of current fleet information provided by GNSS is apparent for bringing, exigency vehicle, and scheduled service fleet despatch and control. AVLS are being developed or installed in many of North America ‘s 10.3 million hauling and exigency fleets, presently affecting about a million vehicles in North America. Qualcomm Corp. is a innovator of fleet trailing, with over 500.000 trucks and other fleet vehicles tracked via its OmniTRACS System.Many of these are GPS equipped, chiefly outside of the United States and peculiarly in South America. Urban theodolite coachs are happening application of GPS for agenda care and safety sweetening. The thrust toward increasing the capacity of the bing transit substructure has spawned the emerging construct of intelligent transit systems ( ITS ) . These systems are meant to modify traffic flow harmonizing to demand and other factors. One manner to make this involves the monitoring of the advancement of vehicles that are conveying their place to a cardinal location. Traffic signals or rerouting marks can so be used to react to state of affairss where a peculiar investigation vehicle is non come oning as it should under optimal conditions. Another facet of ITS involves the automatic aggregation of main road and other tolls and duties. This eliminates the demand for vehicles to halt at province lines or at toll booths on toll roads and Bridgess if their place is being reported and appropriate accounting agreements are made between the tariff-collecting authorization and the vehicle ‘s operator. This is most appropriate for commercial operations, but it is non impossible that private cars could be capable to the same sort of system. It would be possible in early execution to supply a through lane at toll booths for suitably equipt vehicles. GPS is non cardinal to this sort of engineering. Since the location of the needed toll payment is ever known, the vehicle ‘s passing of a local codification reader would originate toll charge. Yet there are other possible duty systems where entire route use could be tracked and taxed instead than merely on given roadways, as is done now. While the United States is improbable to follow such a gross aggregation system, the EU may be more disposed to make so in order to raise gross from the usage of GALILEO.

In the United States, the Americans with Disabilities Act requires that municipal conveyance installations announce and show location information to riders with sight and hearing disablements. This requires that both hearable and ocular presentations be provided. Many theodolite systems do non to the full follow with this demand. Systems to supply this information automatically are attractive and low cost. GPS enables them.

Land pilotage chances for GPS are tremendous. The incorporation of traveling maps and databases into private rider vehicles will bring forth more demand for GPS merchandises than all other vehicle markets combined. Early land-based arrangers of the engineering, of class, are the fleet operators, who can derive important benefits from more efficient trailing and despatch operations with incorporate pilotage and communications installations. One construct employed is called geofencing, where a vehicle ‘s GPS is programmed with a fixed geographical country and alerts the fleet operator whenever the vehicle violates the prescribed “ fencing ” .

GNSS in Surveying, Mapping, and Geographical Information Systems

For several grounds, GPS receiving system engineering owes much to its early application in the concern of land surveying. The production of maps and charts and the georeferencing of informations utilizing GPS are natural branchs of the accurate and dependable techniques developed for the land-survey market.


The immense economic advantage of utilizing GPS in appraising applications drove the development of really sophisticated GPS equipment and tools to foretell GPS coverage and derive place with centimetre truth. Delaies in the launch of GPS orbiters caused by the Challenger catastrophe in 1986 farther strengthened the head start that appraising applications got over navigational utilizations of the system, and important polishs in the usage of carrier-phase, dual-frequency, station processed, differential places were made. Extreme truth is possible by using information on orbiter places available after the fact to the informations obtained in the field. The value of the engineering in the surveying concern stems from the handiness of absolute places with regard to a cosmopolitan co-ordinate system ( WGS-84 ) and from the fact that they can be determined with a much smaller study crew. A individual surveyor can roll up informations in the field, where it would take a two- or three-person crew to accomplish the same consequences utilizing some conventional methods. Collected informations can be processed to the needed truth utilizing cheap computer science installations, and the GPS equipment in the field can be used by the surveyor for unsmooth studies or the location of benchmarks or other characteristics. Differential and kinematic techniques can supply accurate real-time information in the field and rid of the demand for station processing the information, farther cut downing the cost of appraising operations. A great trade of edification has been brought to merchandises in this country, and to a big extent the market is mature, with a smattering of providers good entrenched. While the market for simple surveying by GPS may good be saturated, the usage of GPS as an assistance for position-based informations aggregation for geographical information systems ( GIS ) continues to fuel growing in the market for sophisticated receiving systems.

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A major early execution of GPS was in the proviso of land truthing, or orientation of aerial photogrammetry. Aircraft or ballistic capsule are used to snap big countries of the Earth ‘s surface. Index Markss are frequently surveyed on the land to supply mention locations on these exposures, which can be used in finding their graduated table and orientation. GPS can be used to study these mentions. Further, the usage of these mentions can be eliminated wholly if the place of the camera can be known accurately adequate at the precise minute it took the image. This engineering has been developed utilizing GPS augmented by accurate INS. Inertial systems have first-class short-run stableness but tend to float over clip and necessitate recalibration. By contrast, GPS has its built-in absolute citing capablenesss and can supply first-class augmentation for an INS. The two can be used together in this sort of application ; the INS to assist decide rhythm ambiguities inherent in the kinematic method of GPS usage and to transport positioning responsibilities over the short periods of GPS outage that may happen. The coevals of route maps, or any other sort of characteristic map, is now highly easy, achieved merely by entering a series of places as a receiving system is moved over the country to be mapped. Any grade of postprocessing necessary to accomplish desired truth is available. Specific locations recorded may be annotated with location-specific information, such as street reference, lift, or flora type. This type of informations aggregation is peculiarly utile for the edifice of informations for GIS.


Anyone charged with the duty of pull offing a distributed stock list, such as might be the instance with a public-service corporation, municipality, or steelyard, might appreciate the ability to turn up and place this stock list rapidly and accurately. This is the function played by GPS in concurrence with GIS. The last decennary has seen a proliferation of GIS package bundles and plans. Government bureaus and public-service corporations have been eager to follow this engineering, but find that the initial input of informations and timely updating thereof is a immense undertaking utilizing conventional agencies of informations aggregation. With GPS, it is possible to capture position-referenced informations in the field with a simple hand-held computing machine. The state of affairs is best illustrated by the illustration of the direction of a municipality ‘s street lamps. There may be a mix of fluorescent, Na, quicksilver, and candent visible radiations, with several assortments of each. The care applied scientist capable of acknowledging the types can be dispatched with a GPS-based information aggregator to log the location of each type of installing. This information can be loaded into a cardinal database, so that when care is necessary, the appropriate replacings can be ordered, stocked, and dispatched. Steel Millss store big measures of merchandise in immense paces, stacked in such a manner as to forestall warping. The tonss must be rotated sporadically, on a set agenda. Further, there are different types of merchandises that are identical from one another, except for the record of where each was put. The layout of these paces does non impart itself to physical marker, so accurate GPS can be used to turn up each stack and mention its contents to a cardinal database. The direction of other yard stock list points such as transporting containers or timber is similar, and GPS applications have been investigated here besides.

A quickly turning and extremely seeable enterprise is the direction of natural resources. Environmental impact surveies involve the aggregation of big sums of position-related informations, and GIS is prevailing here, excessively. GPS is instrumental in roll uping informations to supply input to animal population surveies and the similar.

Finally, a whole new subject, referred to as preciseness agriculture, or agriculture by the pes, has emerged. The application of pesticides, weedkillers, and fertilisers is going an progressively demanding scientific discipline. Many farm implement makers are bring forthing variable-rate application equipment that is controlled by sophisticated electronics coupled to a kind of GIS. It has been shown that stuff input costs can be reduced by 40 % , and output sweetenings of a similar magnitude can be expected. Furthermore, the harmful effects of the overflow of unnecessary fertilisers can be mitigated. It is possible that the variable application of fertilisers might be legislated for this ground. GPS of class is cardinal to the dirt function to find demands and to the control of application vehicles.

Several houses offer merchandises to steer airborne appliers of pesticides. These systems involve customized function modus operandis to direct the pilot of harvest dust storm swath by swath over a peculiar field. This allows the replacing of the flagperson, who would direct the pilot from the land ( a occupation in a really risky environment ) , with more accurate electronic counsel. This reduces the sum of overspray and can significantly diminish the sum of clip and stuff used.