MODULATING SIGNAL DESCRIPTION

0342-EX-PL-2009 Text Documents

ARTEMIS, Inc.

2009-09-21ELS_101289

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 # 0342-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-Ku,” which is an ARTEMIS, INC. internal designation for this project. This document describes the SlimSAR-Ku transmitted waveform. Transmitted Signal The SlimSAR-Ku 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=15780 MHz or f 0=16759.4 MHz and linearly increases to f 1=16540.6 MHz or f 1=17520 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-Ku transmitted signal. Illustration 1: Spectrogram of the SlimSAR-Ku transmitted signal.


Document Created: 2019-05-09 16:46:10
Document Modified: 2019-05-09 16:46:10
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