Illumination
The signals coming from GPS satellites. Inclination
One of the orbital parameters that describes the orientation of an orbit. It is the angle between the orbital plane and a reference plane. Index contour
A contour line on a topographic map that is labelled as to elevation; used as a reference. Infrared (IrDA)
Infrared data association. IrDA's goal is to establish standards for the exchange of data over infrared waves. Infrared technology would let devices "beam" information to each other in the same way that your remote control tells the TV to change the channel. You could, for example, beam a document to your printer instead of having to connect a cable. On handhelds, the most common use for infrared is the "beaming" of data to another handheld with an infrared port. The IrDA standard has been widely adopted by PC and consumer electronics manufacturers. Infrared port
An infrared port that facilitates the short range beaming of information between PDAs and other electronic devices such as printers, computers and televisions. Initialization
The first time a GPS receiver orients itself to its current location and collects almanac data. After initialization has occurred, the receiver remembers its location and acquires a position more quickly because it knows which satellites to look for. Also, entering such data as time, time off-set, approximate position, and antenna height into a receiver (cold start with no almanac) to help the unit find and track satellites. Input/Output (I/O)
Refers to data transfer from input devices (keyboard, mouse, scanner, etc.) to output devices (printer, screen, etc.).
Also, the two-way transfer of GPS information with another device, such as a navigation plotter, autopilot, or another GPS unit. I/O Address
Memory location for a particular device (disk drive, sound card, printer port, etc.). Two devices cannot share the same I/O address space. Integrity
A quality measure of GPS performance for critical applications such as civilian aviation. The ability of a system to supply timely warnings in the event of a loss of navigation solution, excessive noise, or other factors affecting measured position. A high level of integrity is sought for such applications. Interference
Any distortion of the transmitted signal that impedes the reception of the signal at the receiver (same as noise). Interferometric Differencing
A variation of phase differencing in which two different antennas sample the GPS signal wavefront at two locations and then feed the information into a single amplifier and mixer (interferometer) in which phase difference observations are made. Internet
The global computer network, composed of thousands of WANs and LANs that uses TCP/IP to provide world-wide communications to homes, schools, businesses and governments. The WWW runs on the Internet. Intranet
Computers linked through a network, usually within a single company's premises. Ionosphere
That layer of the atmosphere approximately 30-300 miles above the earth’s surface that contains electrically charged particles (ions). These charged particles interfere with or distort transmissions of electromagnetic signals through the layer, including the transmission of GPS radio waves. iPAQ Expansion Pack System
Allows you to personalize the appearance of your iPAQ H3000 or add extra functionality. iPAQ Style Packs offer a range of styles to customize your iPAQ, while Expansion Packs, such as the CF Card, or PC Card Expansion Pack, let you add extra features. Compaq iPAQ Expansion and Style Packs are designed to be easily slid on and off your Pocket PC without having to power off your Pocket PC first. iPAQ Navigator/Action Button
Allows you to scroll through a list (similar to pressing the arrow keys on a keyboard). In the list view of a program, you can use your iPAQ Navigator to scroll to the item you want to view. Can also be used as game buttons within a game application. The centre of the button can be used as an Action button to open a selected item. ISP (Internet Service Provider)
A company that provides access to the Internet. For a monthly fee, subscribers are provided with the necessary software, a username, password and access phone number. Using a modem or ISDN terminal adaptor they can then log on to the Internet, browse and download from the WWW and send and receive e-mail. An amount of free Web space is generally provided, allowing the subscriber to create a Web site and thereby have a presence on the Web. |
