The envelope of the individual pulses could be used to establish a receiver's internal timing within the 10-second pattern. However, it was the phase of the received signals within each pulse that was used to determine the transit time from transmitter to receiver. Using hyperbolic geometry and radionavigation principles, a position fix with an accuracy on the order of 5 - 10 km was realizable over the entire globe at any time of the day. Omega employed hyperbolic radionavigation techniques and the chain operated in the VLF portion of the spectrum between 10 and 14 kHz. Near the end of its service life of 26 years, Omega evolved into a system used primarily by the civil community. By receiving signals from three stations, an Omega receiver could locate a position to within 4 nmi using the principle of phase comparison of signals.
Omega was approved for development in 1968 with eight transmitters and the ability to achieve a 4 mi accuracy when fixing a position. Each Omega station transmitted a sequence of three very low frequency (VLF) signals (10.2 kHz, 13.6 kHz, 11.333... kHz in that order) plus a fourth frequency which was unique to each of the eight stations. The duration of each pulse (ranging from 0.9 to 1.2 seconds, with 0.2 second blank intervals between each pulse) differed in a fixed pattern, and repeated every ten seconds; the 10-second pattern was common to all 8 stations and synchronized with the carrier phase angle, which itself was synchronized with the local master atomic clock. The pulses within each 10-second group were identified by the first 8 letters of the alphabet within Omega publications of the time.
Due to the success of the Global Positioning System, the use of Omega declined during the 1990s, to a point where the cost of operating Omega could no longer be justified. Omega was shut down permanently on 30 September 1997. Several of the towers were then soon demolished.
Omega stations used very extensive antennas to transmit at their very low frequencies (VLF). This is because wavelength is inversely proportional to frequency (wavelength in metres = 299,792,458 / frequency in Hz), and transmitter efficiency is severely degraded if the length of the antenna is shorter than 1/4 wavelength. They used grounded or insulated guyed masts with umbrella antennas, or wire-spans across both valleys and fjords. Some Omega antennas were the tallest constructions on the continent where they stood or still stand.
News of the outbreak of civil war in East Pakistan was reported in Peace News in March 1971 by Roger Moody. In the June issue, Moody first announced the formation of Operation Omega: a small group of Londoners...sailing supplies into East Bengal, regardless of the consequences to the participants...The project would bear obvious similarities to nonviolent interventions of the recent past - especially the Phoenix Voyages by a Quaker Action Group in 1967-68 The Phoenix Voyages were a series of humanitarian trips made to relieve the famine in Biafra following the civil war there. Paul Connett had been a key player in the American response to the Biafran crisis, working as the coordinator the American Committee to Keep Biafra Alive. In 1971, Connett co-founded Operation Omega with Roger Moody.
In October 1998, with the Chevrolet Omega B, General Motors do Brasil ceased local production in favour of a rebadged version of the Holden Calais (VT) sedan imported from Australia (as would be the case for Middle East bound models, instead badged Chevrolet Lumina).
Opel was planning to upgrade its flagship Omega model with powerful GM LS1 V8 engine used in Chevrolet Corvette. Unlike V8.com which was the concept car, this model was intended to go into the serial production. Omega V8 was shown publicly for the first time at 70th Geneva Motor Show (March 2–12, 2000). The V8 engined version was to be put on sale autumn 2000.
This Omega also inherited a larger differential from Holden's Commodore with a 45% LSD, whereas the gearbox was a six speed manual ZF gearbox fitted to the Corvette ZR1. The tyres were custom made by Goodyear, and can be recognised by the small Greek letter Ω (Omega) on the side. These were required as this car could reach 280 to 300 km/h, which made this Omega the world's fastest production sedan at the time.
Following the demise of Omega Red, a secret organization known as "The White Sky" which is specialized in growing and programming unique assassins to meet all their clients' expectations, were hired to create three "clones" from the remains of the original Omega Red. Each of these clones have different abilities from each other and they passionately hate X-Force just for the fact they were implanted with false memories to believe that X-Force members had killed their father.
On 18 May 2001, GM announced that the Omega CD would now be based on the VX Calais, designed and manufactured in Australia. Although based on the Holden Calais, the Brazilian model instead featured the boot lid from VX series base models (whose tail lamps did not extend into the boot lid).
The next update was announced by GM on 28 April 2003, with the Omega CD now based on the VY Calais, again in a single "CD" specification.
GM announced a final update of Omega B on 9 March 2005, now based on the Holden VZ series, powered by the new 3.6-liter Alloytec V6 engine. It was again sold in a single "CD" specification-specification CD model, this time based on the VZ Berlina with some extra equipment from the VZ Calais. Sales ended in 2007 with the arrival of the new Omega C.
Based on the Opel Omega A, the Chevrolet Omega A debuted in Brazil in 1992 with a choice of two engines—a 2.0-liter four-cylinder (GLS and GL trim) and 3.0-liter six-cylinder (CD trim). From 1995, following the discontinuation of Omega A in Germany, the engines were upgraded to a 2.2-liter four (GLS) and a 4.1 L Chevrolet straight-six engine (CD) as used in the previous GM Opala albeit tuned by Lotus and with electronic multiport fuel injection added. Both sedan and station wagon (called Omega Suprema) body styles were available. The station wagon shared the exact powertrain configuration and trim options with the sedan versions. Some funeral parlor owners chose the Omega Suprema as the preferred car for hearse-based modifications.
In addition to the bigger engines, suited to local petrol quality, General Motors do Brasil had also deemed it necessary to beef up the suspension of the Omega to deal with Brazilian road conditions. The CD version was offered the availability of the 4L30-E automatic transmission as an option.
Operation Omega was supported by Peace News and by War Resisters' International.
For the third generation Chevrolet Omega C, General Motors again looked to Holden. The new model was announced on 4 July 2007, was now based on a rebadged Holden Berlina (VE). It was again powered by the 3.6-liter Alloytec V6 engine. Due to the global financial crisis, imports ceased in 2008.
In October 1989, the Omega 3000 received an optional new engine with 24 valves, two overhead camshafts, and a variable intake manifold (Opel Dual Ram system). It also used a more advanced engine control unit. Power increased to 204 PS, which increased top speed to 240 km/h, and 0–100 km/h time dropped to 7.6 seconds. At the same time, output of the catalyzed two-valve version increased to 177 PS, the same as the uncatalyzed original.
In 1989, Opel sanctioned a high performance version of the Omega built in cooperation with Lotus. This version was named the Lotus Omega or Lotus Carlton depending on whether the base car was sold as an Opel Omega or Vauxhall Carlton in their respective European markets. The car was built using a variety of parts from other GM suppliers and manufacturers. The engine was based on Opel's standard 3.0 litre 24 valve, which was handed to Lotus to modify.
The reasons for cancelling production plans were concerns about whether the engine was vollgasfest (German, "Full throttle resistant"). There was fear the engine might overheat and be damaged if driven flat out on the Autobahn for long periods of time. Holden did equip its Commodore (which was a re-engineered Omega for Australian market) with the same engine. A version of this platform was used for the Holden Monaro which was marketed in the United States as the fourth generation Pontiac GTO, and in the United Kingdom as the Vauxhall Monaro.
The Omega Clan is composed by: