IMSAR System Info

0676-EX-ST-2019 Text Documents

IMSAR LLC

2019-04-15ELS_227597

Company and Technology Background

         IMSAR LLC has radar technology that is able to track moving targets, image the surface of the earth, create digital
elevation maps, assist in search and rescue operations, and detect small changes in a scene, such as the movement of a
vehicle. Various branches of the US military, including the Navy, Army, and Air Force, as well as some commercial
businesses, have expressed interest in this technology. The size, weight, power, and cost of IMSAR’s Synthetic Aperture
Radar (SAR) system, known as NanoSAR, are an order of magnitude less than similar systems.

          IMSAR performs SAR tests from a small aircraft typically flying between 2,000 and 14,000 feet MSL Directional
transmit and receive antennas are nominally pointed toward the earth. Reflected signals are collected and processed to
create images of the ground. Transmission is a linear frequency modulated continuous wave (LFM-CW), or a "chirp," with
the frequency being swept from the minimum to the maximum frequency 1000 times per second. A chirp signal is
illustrated in Figure 1. Because the frequency sweeps are very rapid, the average power at any given frequency is
extremely low, as is the likelihood of detection by (i.e., interference to) ground based systems operating in the same
frequency range.




                              Figure 1. Example LFM chirp signal, increasing in frequency from left to right, then
                              repeating.


         The Ku-band system typically operates with a contiguous bandwidth of 1500 MHz, and can be programmed to
operate anywhere between 15.4 and 17.7 GHz. The system is not currently capable of notching in the middle of the 1500
MHz band. Therefore, if a potential conflict is present, the transmission frequencies must be moved to a different portion of
the 15.4-17.7 GHz band, or the bandwidth reduced. The system can operate with a reduced bandwidth (< 1500 MHz), but
the imaging capabilities are reduced proportionately. An example of the geometry of a SAR is shown in Figure 2.


         Figure 2. Example SAR geometry, from an airborne platform.



© 2013 IMSAR, LLC ∙ 940 South 2000 West, Suite 140 ∙ Springville, UT ∙ 84663 PH 801-798-
                      8440 ∙ FAX 801-798-2814 ∙ www.imsar.com



Document Created: 2017-12-07 13:16:14
Document Modified: 2017-12-07 13:16:14

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