MODULATING SIGNAL DESCRIPTION

0243-EX-PL-2009 Text Documents

ARTEMIS, Inc.

2009-07-08ELS_99697

EXHIBIT #3 as part of FCC FORM 442 – APPLICATION FOR NEW RADIO STATION UNDER PART 5 OF FCC RULES – EXPERIMENTAL RADIO SERVICE (OTHER THAN BROADCAST) submitted by ARTEMIS, INC. File # 0243-EX-PL-2009 This exhibit provides: MODULATING SIGNAL DESCRIPTION The proposed radiating device is a synthetic aperture radar (SAR) system being developed by ARTEMIS, INC. For the remainder of this document, it will be referred to as “SlimSAR-X,” which is an ARTEMIS, INC. internal designation for this project. This document describes the SlimSAR-X transmitted waveform. Transmitted Signal The SlimSAR-X transmits a continuous wave (CW) which is frequency modulated by a periodic “chirp” -- so called because the frequency increases linearly over the period of the modulating chirp. Mathematically, one period of the transmitted waveform may be expressed as kr 2 s t t= A0 cos [2 f 0 t t ] 2 where A0 is a constant amplitude, f 0 is the starting frequency of the chirp and k r is the chirp rate. The chirp rate is defined as the ratio of the bandwidth of the transmitted signal to the period of the chirp, or k r =B/T p . In other words, the transmitted signal is a sinusoid whose frequency begins at either f 0=8934 MHz or f 0=9913.4 MHz and linearly increases to f 1=9674 MHz or f 1=10500 MHz over a period of time T p , which is arbitrary. The signal is repeated with no break. Illustration 1 shows a frequency versus time spectrogram of the SlimSAR-X transmitted signal. Illustration 1: Spectrogram of the SlimSAR transmitted signal.


Document Created: 2019-04-26 17:58:07
Document Modified: 2019-04-26 17:58:07
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