Using the GPS System for Accurate Computer Time
Time is referenced to Universal Coordinated Time (UTC), which is the same worldwide and does not vary with time zones. The GPS satellites continuously transmit precise time information. GPS time is not affected by leap seconds and is currently 14 seconds ahead of UTC time. GPS time can easily be adjusted to provide UTC time for computer network time synchronisation. The GPS satellites broadcast a very weak low-power radio signal. The signal has two frequencies, L1 and L2. L1 is intended as a civilian GPS band broadcast at 1575.42 MHz. L2 should provide stronger signal transmissions in the future. The signal travels in a straight line and can pass through clouds, glass and plastics but is blocked by objects such as metal and brickwork. Therefore, ideally, a GPS antenna requires a good view of the sky. The ideal location for a GPS antenna is on rooftop with a good view of the sky. If it is impractical to locate a roof-mounted antenna, installation on the side of a building can be adequate.
The GPS system provides a subscription-free accurate timing resource. Many computer networks utilise the GPS clock as an accurate timing reference for computer synchronisation. Precise GPS NTP server systems utilise GPS reference clocks as an external synchronisation source. The GPS system can supply highly precise time and frequency information accurate to a couple of nanoseconds. This accuracy is generally more than enough for most computer network timing applications.
Most GPS receivers transmit time and positioning information in a serial format using the standard NMEA protocol. Information is transmitted as sentences of character strings. Additionally, a highly accurate timing pulse is generated which marks the beginning of each second. This timing pulse can be converted to a RS232 signal level and fed into a RS232 control line interrupt to provide a precise timing reference. When the timing pulse is combined with the NMEA output sentences, a very accurate timing reference becomes available for use by NTP servers or computer timing equipment.
By: David Evans
About the Author:
David Evans is an expert in the field of computer time synchronisation solutions and provides a technical authoring service to the time and frequency industry. Click here to find out more about GPS NTP server solutions.
GPS – a Valuable Tool in Navigation
Put away your compass and don’t bother with your maps, a GPS tracking system will take care of all your navigation needs. Quite simply, a GPS system is the most effective navigation tool on the market today. Using satellite systems around the world, a GPS navigation system is able to locate your exact position in the world, no matter where you are.
GPS is a satellite-based radionavigation system developed and operated by the U.S. Department of Defense. GPS allows land, sea, and airborne users to determine their position, velocity, and time 24 hours a day, in all weather, anywhere in the world with a precision and accuracy far better than other systems available today or in the foreseeable future.
GPS has become a widely used program used for map-making, commerce, land surveying, hunting, and scientific research. Not only is it used for civilian purposes, it is also used for military and naval exercises. Most importantly, what is trusted by the military and navy is now available to the average person. With technological advances and improvements in on-screen maps, there has never been a better time to use a GPS navigation system.
Developed by the Department of Defense in the United States, GPS is officially known as the NAVSTAR GPS. The satellite constellation is managed by the United States Air Force and has been used as navigation tool for quite some time.
A GPS receiver calculates its position by measuring the distance between itself and three or more GPS satellites. By measuring the time delay between transmission and reception of each GPS microwave signal, the GPS calculates the distance based on the time delay.
GPS receivers come in a variety of formats and, due to the increase in technological advancements with regards to GPS, can be integrated into cars, phones, and even watches. GPS systems have become easy to use and easy to care for – people all across the world are taking the time to understand the benefits the GPS navigation system can bring to one’s life.
Because the GPS system is owned completely by the government, the GPS will be free as stated in the Presidential Decision Document of 1996 – which indicates that the U.S. will continue to provide the GPS Stand Positioning Service for peaceful civil, commercial and scientific use on a continuous, worldwide basis, free of direct user fees.
Who would use a GPS system? There are many different uses for GPS devices:
Farming – For navigation during the night time on tractors
Balloon Tracking – to identify your location while high in the sky
Cell Phone Tracking – Used by 911 emergency assistants to locate the whereabouts of a missing person with a cell phone
Roadside assistance – to tell the towing company exactly where you are
Hunting – to track your location and your hunt
Boating – to help you find your location whenever fog rolls into your area
Consider asking yourself why you don’t have a GPS navigation system. And by considering all the benefits of GPS systems, you may begin to realize how a GPS navigation system could improve your life.
RESOURCE BOX:
By: Barry Jenkins
About the Author:
BLJ’s Enterprises is a top provider of self defense tools, including GPS systems, in the United States. At their website, http://bljsselfdefense.com/index.php, you will find quality products as well as free in-depth information regarding personal protection. Because BLJ’s Enterprises is dedicated to matching everyone with the right self defense method, customer comments and questions can be directed to the owner, Barry Jenkins himself, at blj@bljsselfdefense.com.
Double Din Car DVD Player GPS Navigation 7inch touch screen and TV+RDS+IPOD+Auw-in special for Peugeot 307
Contact info:
iCQ: 497307366
MSN: playerav (at) hotmail com
Yahoo: szutility (at) yahoo com cn
Skype: suavcardvd
AOL: suav2009
E mail : sales6 (at) szutility com
Website: www suav net cn
Product Description
Model No.: CAV-8065PG
Double din car DVD player special design for Peugeot 307 car
Selling points:
1) Special design for Peugeot 307
2) GPS+Bluetooth+USB+SD+RDS+IPOD+Aux-in+AM+FM+TV
3) Dual zone function: driver can listen to music while viewing the map
4) 3D interface Three colors (Blue, Red, and Green).
5) Game features, built-in four games
6) Easy installation: exactly the same dimension with the original car DVD, no modification needed
Specifications:
1) 6.5inch touch screen TFT panel
2) Built-in stereo AM/FM/RDS
3) IPOD control
4) Buit in stereo bluetooth
5) Built-in GPS system (Wince 5.0)
6) With USB port,double SD card slots and AUX-IN
7) Easy installation: exactly the same dimension with the original car DVD, no modification needed
Special cable connector for the original car Same style with the car9) One channel AUX Video input, two channel Video output
10) Parking Rear view camera input interface
11) 45W*4 MAX power output
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SUAV INDUSTRIAL CO., LIMITED with totally 5000sqm workshop coverage, two factories ( one for car electronics, another for popular consumer digital items),Our monthly productivity reaches over 100,000 units/pcs and still increasing,We offer both potential and long-standing clients a complete supply solution.
SUAV INDUSTRIAL CO., LIMITED mainly produce the following products:
1, latest design multifunctional car DVD player TV GPS
( headrest/sun visor DVD player with game, double din DVD, in-dash DVD, car TV, etc. )
2, unique video glasses private cinema
3, various latest design MP3 MP4 MP5 player
4, portable mini DVD player
We can do the product as our customer”s idea. From outlook, PCB design to complete production.ODM and OEM orders are welcom.Welcoming interested companies to cooperate with us, we look forward to having the opportunity of working with companies around the world for joint growth and mutual success. Please feel free to contact us at any time.
Our aim for the customer solution is not merely the product quantity and quality, but also through the supply chain, using the information technology to become customer’s production line truly, to constantly optimize the product on aspect of technology, speed, cost, timing and so on, to promptly satisfy the request in customer”s changes, to realize value transfer, to enhance the competitive strength on market, to achieve the goal of long-term cooperation and mutual development.
Based on the idea of “base on sincerity, reputation first”, our company takes unity, practice, exploitation, innovation as the company philosophy, and service consciousness as the company policy. Depending on the outstanding product quality and the perfect service, with years of hard-work, our products have been sold all over the world, gaining consistent high praise from partners.
By: car dvd gps
About the Author:
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Car DVD GPS TV IPOD navi tv rds bluetooth 7inch touch screen Special for Volkswagen PASSAT B5,Golf,POLO,Pora old models
Contact info:
iCQ: 497307366
MSN: playerav (at) hotmail com
Yahoo: szutility (at) yahoo com cn
Skype: suavcardvd
AOL: suav2009
E mail : sales6 (at) szutility com
Website: www suav net cn
Product Description
Model No.: CAV-8070PL
1) 7-inch monitor touch screen double-Din complete car entertainment system
2) Compatible with DivX,MP4,MP3,multiple regions DVD, VCD, CD and CD-R/CD-RW
3) Built-in GPS function and Bluetooth for hands free call (play CD/DVD/FM while watching GPS navigation image)
4) Keys with touch sensor
5) OSD menu with graphical user interface
6) USB port and SD slots
7) Built in TV tuner,PAL/NTSC or SECAM compatible
Built in FM/AM tuner,OS: WIndows CE 5.0————————————————————-
SUAV INDUSTRIAL CO., LIMITED mainly produce the following products:
1, latest design multifunctional car DVD player TV GPS
( headrest/sun visor DVD player with game, double din DVD, in-dash DVD, car TV, etc. )
2, unique video glasses private cinema
3, various latest design MP3 MP4 MP5 player
4, portable mini DVD player
For more details about video glasses, please visit our webpage at:
http://www.szutility.com or http://www.suav.net.cn
ODM and OEM are welcomed!
———————————————————–
SUAV INDUSTRIAL CO., LIMITED mainly produce the following products:
1, latest design multifunctional car DVD player TV GPS
( headrest/sun visor DVD player with game, double din DVD, in-dash DVD, car TV, etc. )
2, unique video glasses private cinema
3, various latest design MP3 MP4 MP5 player
4, portable mini DVD player
—————————————————————–
SUAV INDUSTRIAL CO., LIMITED mainly produce the following products:
1, latest design multifunctional car DVD player TV GPS
( headrest/sun visor DVD player with game, double din DVD, in-dash DVD, car TV, etc. )
2, unique video glasses private cinema
3, various latest design MP3 MP4 MP5 player
4, portable mini DVD player
By: car dvd gps
About the Author:
Audi A3 dvd gps,car dvd gps,auto dvd gps,dvd,car dvd,dvd gps,car gps,rds,tmc,tomtom gps system,audi dvd gps special,car tmc,office systems,car dvd tv,touch screen car dvd,audi dvd gps ,in dash dvd,two din car dvd,specail dvd audi,car dvd rds,car dvd play,6.5inch car dvd, 7inch car dvd, auto dvd, auto dvd gps navigation, auto dvd navi, auto dvd player, auto dvd players, auto dvd systems, auto dvd video, auto gps navigation, auto gps reviews, auto gps systems, auto navigation, auto navigation gps, auto navigation system, auto navigation systems, automobile gps navigation system, automobile gps navigation systems, automobile gps review, automobile navigation, automotive gps, automotive gps navigation system, automotive gps review, automotive gps systems, best car gps, best car gps system, best gps navigation, best gps navigation system, best gps navigation systems, best gps systems, best navigation system, best portable gps, bluetooth gps, car dvd, car dvd for mazda 6, car dvd navi for mazda 6, car dvd players, car gps, car gps navigation review, car gps navigation system, car gps reviews, car gps system, car gps systems, car navigation, car navigation gps, car navigation system, car navigation systems, car satellite navigation system, cheap gps navigation, cheap gps systems, compare gps, compare gps features, compare gps navigation systems, compare gps system, compare gps systems, compare navigation system, dash car dvd, dash dvd, dash gps navigation system, dvd, dvd for prado, dvd for toyota prado, dvd for toyota
TOYOTA VIOS Special Fit Double-din Car DVD Video Player and GPS navigation TV bluetooth RDS IPOD touch screen 7inch
Contact info:
iCQ: 497307366
MSN: playerav (at) hotmail com
Yahoo: szutility (at) yahoo com cn
Skype: suavcardvd
AOL: suav2009
E mail : sales6 (at) szutility com
Website: www suav net cn
Product Description
Model No.: CAV-8070VS
1) Double-Din Multi-media player
2) 7inch or 7inch 16:9 high-resolution TFT LCD touch screen
3) Multiple zone in and out
4) Full function remote control
5) Adjustable auto-save and resume
6) Parameter and position
7) Built-in TV tuner and GPS optional
Multiple system (auto PAL/NTSC) option SECAM9) Wide application and strong compatibility
12) OSD menu instruction AV input/output
11) Special built-in reverse video input while backing the car
12) Built-in anti-shock system: mechanical and electronic
13) Built-in Dolby and DTS 5.1 digital and Dolby
14) Prologic II decoder
15) Maximum output power: 4 x 50W
16) 5.1 RCA line out: front, rear, center and subwoofer
17) Power supply: 12 to 16V DC
18) AM/FM stereo receiver
19) 30 preset stations 18FM, 12AM
20) Auto memory storage/preset scan
—————————————————————–
SUAV INDUSTRIAL CO., LIMITED mainly produce the following products:
1, latest design multifunctional car DVD player TV GPS
( headrest/sun visor DVD player with game, double din DVD, in-dash DVD, car TV, etc. )
2, unique video glasses private cinema
3, various latest design MP3 MP4 MP5 player
4, portable mini DVD player
For more details about video glasses, please visit our webpage at:
http://www.szutility.com or http://www.suav.net.cn
ODM and OEM are welcomed!
By: car dvd gps
About the Author:
Audi A3 dvd gps,car dvd gps,auto dvd gps,dvd,car dvd,dvd gps,car gps,rds,tmc,tomtom gps system,audi dvd gps special,car tmc,office systems,car dvd tv,touch screen car dvd,audi dvd gps ,in dash dvd,two din car dvd,specail dvd audi,car dvd rds,car dvd play,6.5inch car dvd, 7inch car dvd, auto dvd, auto dvd gps navigation, auto dvd navi, auto dvd player, auto dvd players, auto dvd systems, auto dvd video, auto gps navigation, auto gps reviews, auto gps systems, auto navigation, auto navigation gps, auto navigation system, auto navigation systems, automobile gps navigation system, automobile gps navigation systems, automobile gps review, automobile navigation, automotive gps, automotive gps navigation system, automotive gps review, automotive gps systems, best car gps, best car gps system, best gps navigation, best gps navigation system, best gps navigation systems, best gps systems, best navigation system, best portable gps, bluetooth gps, car dvd, car dvd for mazda 6, car dvd navi for mazda 6, car dvd players, car gps, car gps navigation review, car gps navigation system, car gps reviews, car gps system, car gps systems, car navigation, car navigation gps, car navigation system, car navigation systems, car satellite navigation system, cheap gps navigation, cheap gps systems, compare gps, compare gps features, compare gps navigation systems, compare gps system, compare gps systems, compare navigation system, dash car dvd, dash dvd, dash gps navigation system, dvd, dvd for prado, dvd for toyota prado, dvd for toyota
Initial GPS, Where Do You Find Them
Initial GPSes are some of the most hard-to-find GPS brands in the market. Perhaps this might be due to the fact that Initial Technology, the company making them, is actually a business geared towards making entertainment devices. This seems to show in a couple of Initial GPS devices, but in a good way. These models, the Initial GPS GD-72, (which costs $449.99), the Initial GPS GD-71, (which costs $469.99), and the Initial GPS GM-410, (which costs $229.99), are the only GPS units that actually offer built-in DVD players. The Initial GPS GD-72 and the Initial GPS GD-71 even look like portable DVD players. The Initial GPS GM-410, on the other hand, has an appearance typical to most GPS units.
As far as navigational capabilities, Initial GPSes are no different than any other type of GPS. The above-mentioned Initial GPS GD-72 and Initial GPS GD-71 along with the other non-DVD Initial GPSes, (including the $199.99 GM-350 GPS Receiver and the $379.99 GM-501 GPS Receiver), are pretty much the same when it comes to navigation. Their interface consists of colorized touch screens and Bluetooth technology for hands-free telephone calls. The devices include preloaded U.S. maps and 2 million points of interest. As far as directions, they are voiced, a feature common in many famous brands available on the market.
Initial GPS models offer a unique choice for those looking for more affordable GPS options. Not only are they pretty much standard when it comes to GPS navigation, but many of them even have DVD players. Such a feature allows one to save even more money, since portable DVD players by themselves can be hundreds of dollars. Truly, these types of Initial GPS models can almost be considered an all-in-one device, since they provide both GPS capabilities as well as DVD capabilities. The only challenge one will face if they do want to purchase an Initial GPS is where to buy one. The Initial Technology site doesn’t even offer the products for sale, and of the few sites that do, the more interesting Initial GPS GD-71 and Initial GPS GD-72 models tend to not be in stock. Even the average shopping comparison site seems barren when one tries to search for Initial GPSes. However, you will find that Target stores carry a full line of Initial GPS receivers. Another good source is the Internet and auction sites like eBay. No matter where you find them Initial GPS systems are easy to use and reliable.
By: Jim Kesel
About the Author:
