FACTOID # 8: Bookworms: Vermont has the highest number of high school teachers per capita and third highest number of librarians per capita.

 Home Encyclopedia Statistics States A-Z Flags Maps FAQ About

 WHAT'S NEW

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

(* = Graphable)

Encyclopedia > Ionospheric sounding

In telecommunication, an ionospheric sounding is a technique that provides real-time data on high-frequency ionospheric-dependent radio propagation, using a basic system consisting of a synchronized transmitter and receiver.

The time delay between transmission and reception is translated into effective ionospheric layer altitude. Vertical incident sounding uses a collocated transmitter and receiver and involves directing a range of frequencies vertically to the ionosphere and measuring the values of the reflected returned signals to determine the effective ionosphere layer altitude. This technique is also used to determine the critical frequency. Oblique sounders use a transmitter at one end of a given propagation path, and a synchronized receiver, usually with an oscilloscope-type display (ionogram), at the other end. The transmitter emits a stepped- or swept-frequency signal which is displayed or measured at the receiver. The measurement converts time delay to effective altitude of the ionospheric layer. The ionogram display shows the effective altitude of the ionospheric layer as a function of frequency.

Results from FactBites:

 Ionospheric sounding - Wikipedia, the free encyclopedia (188 words) In telecommunication and radio science, an ionospheric sounding is a technique that provides real-time data on high-frequency ionospheric-dependent radio propagation, using a basic system consisting of a synchronized transmitter and receiver. The time delay between transmission and reception is translated into effective ionospheric layer altitude. Vertical incident sounding uses a collocated transmitter and receiver and involves directing a range of frequencies vertically to the ionosphere and measuring the values of the reflected returned signals to determine the effective ionosphere layer altitude.
 Ionospheric sounding - Patent 5230076 (6586 words) An ionospheric sounding system according to claim 2 wherein the code is selectable from a plurality of codes and the receiver is capable of receiving and distinguishing the codes whereby information can be transmitted by means of the code selection. An ionospheric sounding system according to claim 7 wherein there is included means to measure the mean noise level in the receiver prior to a measurement interval when the peak impulse response is measured. An ionospheric sounding system according to claim 28 wherein there is included means to measure the mean noise level in the receiver prior to a measurement interval or window when the peak impulse response is measured.
More results at FactBites »

Share your thoughts, questions and commentary here