07-04-2012, 10:58 AM
GPS SEMINAR
[attachment=19669]
How does GPS work?
GPS units are radio receivers. They do not transmit.
•receive signals from satellites
•Receives many satellites at the same time
•The more satellites received, the better the accuracy
•Reception can be compromised by trees and buildings.
•Generally need line of sight to the satellite.
•Need at least 3 satellites locked for a 2D fix, more for a 3D fix.
•SA (Selective availability) removed in May 2002. Accuracy now
down to 20 feet or less
http://www.youtubewatch?v=wi_3XwkA8cQ&NR=1
Where
is it?
What is
around
me?
What
time is
it?
Where
am I?
How do
I get
there?
Usage Fees
No Usage fees
No license fees
Unlike celluar phones……..there are ….
Type of units:
1: Automotive
a. Removable (add on accessory) or built into car
b. May or may not have battery
c. Removable type uses suction cup to windshield or dash
(Windshield use illegal in California)
d. Can block vision if improperly installed.
e. Newer types are Bluetooth enabled for audio and cell
phone operation
f. Powered internally or plugs into cigarette lighter socket
g. Some have built in speakers to assist in routing to your
destination
h. Some units have provision for external antenna
connection for better reception.
i. Most popular screen size is 4.3 inches, although 3.5” is
widely available
j. Battery use if available, is limited to a couple of hours
depending on backlight level on LCD screen
k. Most come with USB support but lack serial port
input/output
Serial Port
Data I/O
Type of units:
2: Handheld
a. Smaller means pocket sized
b. Batteries last 5 hours to 24 hours depending on backlight
c. May come with or without street maps.
d. May have memory slot or not for adding/changing maps
e. If using disposable batteries, usually 2 AA batteries
f. Smaller screen, held closer to face
g. Usually built rugged, water resistant or water proof for
camping and other outdoor use.
Serial Port
Data I/O
Serial Port
Data I/O supported
h. Most come without serial data input/output but have
USB connections to computer for map upgrading
i. Some smaller units are available to be worn on the wrist
as a watch. Short battery life.
j. Most manufacturers have accessories to make a handheld
unit work in an automobile
Serial Port
Data I/O
Type of units:
3: PDA
a. Personal Data Assistant (HP IPAQ, PALM organizers)
b. Good street level mapping of North America
c. Multi-purpose and tasking handheld computer and GPS
d. Usually has USB but no serial input/output capabilities
e. Most manufacturers have accessories that allow a PDA
unit to be used in an automobile.
f. Some units may be embedded into cell phones
HP 5910
Windows Mobile Computer
And GPS
Uses
Aircraft
Marine
Automobile (emergency response,OnStar)
Geocaching (treasure hunt)
Surveying
Fishing
Hunting
Search & Rescue (Saanich Emerg. Pgrm)
Hiking
Get Directions
Ham radio experiments with APRS
Points of Interest
Fleet Management & tracking
Golfing (golf carts calculate distance)
http://www.youtubewatch?v=flsZVs4l3gU
•GPS works best in line of sight locations
Avoid trees, tall buildings
•Earlier units are less sensitive than recently manufactured
units. Look for the name SiRF3 on the package
•Can start at <$100 to over $800
•Special units are made for motorcycles (bright screen, waterproof,
operate with gloves on)
•Screens can vary. Some are better than others in direct sunlight.
•Power consumption goes up with brighter screens. Battery life
can be shortened drastically.
•Units vary greatly in size and weight.
Pricing Features & Limitations
•Some units have built in maps which are not upgradeable
•Other units use memory cards. You can buy mapping software
to download to the card.
•Some units have optional pre-formatted cards with maps for a
price.
•Some units have serial port I/O to work with other laptop
mapping programs such as Ozzie Explorer or MS Streets and
trips
•Some units have built in antennas inside the case, others have
swing up antennas, and others have removable antennas or have
external antenna connectors for optional rooftop antennas.
Some units have voice output and input, while others only have
output.
•Most units have touchscreen, but some only have buttons.
•Most units formatted with maps for North America do not show any
map information, coastal outlines outside of the region.
[attachment=19669]
How does GPS work?
GPS units are radio receivers. They do not transmit.
•receive signals from satellites
•Receives many satellites at the same time
•The more satellites received, the better the accuracy
•Reception can be compromised by trees and buildings.
•Generally need line of sight to the satellite.
•Need at least 3 satellites locked for a 2D fix, more for a 3D fix.
•SA (Selective availability) removed in May 2002. Accuracy now
down to 20 feet or less
http://www.youtubewatch?v=wi_3XwkA8cQ&NR=1
Where
is it?
What is
around
me?
What
time is
it?
Where
am I?
How do
I get
there?
Usage Fees
No Usage fees
No license fees
Unlike celluar phones……..there are ….
Type of units:
1: Automotive
a. Removable (add on accessory) or built into car
b. May or may not have battery
c. Removable type uses suction cup to windshield or dash
(Windshield use illegal in California)
d. Can block vision if improperly installed.
e. Newer types are Bluetooth enabled for audio and cell
phone operation
f. Powered internally or plugs into cigarette lighter socket
g. Some have built in speakers to assist in routing to your
destination
h. Some units have provision for external antenna
connection for better reception.
i. Most popular screen size is 4.3 inches, although 3.5” is
widely available
j. Battery use if available, is limited to a couple of hours
depending on backlight level on LCD screen
k. Most come with USB support but lack serial port
input/output
Serial Port
Data I/O
Type of units:
2: Handheld
a. Smaller means pocket sized
b. Batteries last 5 hours to 24 hours depending on backlight
c. May come with or without street maps.
d. May have memory slot or not for adding/changing maps
e. If using disposable batteries, usually 2 AA batteries
f. Smaller screen, held closer to face
g. Usually built rugged, water resistant or water proof for
camping and other outdoor use.
Serial Port
Data I/O
Serial Port
Data I/O supported
h. Most come without serial data input/output but have
USB connections to computer for map upgrading
i. Some smaller units are available to be worn on the wrist
as a watch. Short battery life.
j. Most manufacturers have accessories to make a handheld
unit work in an automobile
Serial Port
Data I/O
Type of units:
3: PDA
a. Personal Data Assistant (HP IPAQ, PALM organizers)
b. Good street level mapping of North America
c. Multi-purpose and tasking handheld computer and GPS
d. Usually has USB but no serial input/output capabilities
e. Most manufacturers have accessories that allow a PDA
unit to be used in an automobile.
f. Some units may be embedded into cell phones
HP 5910
Windows Mobile Computer
And GPS
Uses
Aircraft
Marine
Automobile (emergency response,OnStar)
Geocaching (treasure hunt)
Surveying
Fishing
Hunting
Search & Rescue (Saanich Emerg. Pgrm)
Hiking
Get Directions
Ham radio experiments with APRS
Points of Interest
Fleet Management & tracking
Golfing (golf carts calculate distance)
http://www.youtubewatch?v=flsZVs4l3gU
•GPS works best in line of sight locations
Avoid trees, tall buildings
•Earlier units are less sensitive than recently manufactured
units. Look for the name SiRF3 on the package
•Can start at <$100 to over $800
•Special units are made for motorcycles (bright screen, waterproof,
operate with gloves on)
•Screens can vary. Some are better than others in direct sunlight.
•Power consumption goes up with brighter screens. Battery life
can be shortened drastically.
•Units vary greatly in size and weight.
Pricing Features & Limitations
•Some units have built in maps which are not upgradeable
•Other units use memory cards. You can buy mapping software
to download to the card.
•Some units have optional pre-formatted cards with maps for a
price.
•Some units have serial port I/O to work with other laptop
mapping programs such as Ozzie Explorer or MS Streets and
trips
•Some units have built in antennas inside the case, others have
swing up antennas, and others have removable antennas or have
external antenna connectors for optional rooftop antennas.
Some units have voice output and input, while others only have
output.
•Most units have touchscreen, but some only have buttons.
•Most units formatted with maps for North America do not show any
map information, coastal outlines outside of the region.