MARK Resources has extensive experience in radar signal processing, with applications in detection, discrimination, target identification, and target motion and trajectory analysis. The firm's innovative work in this area began in the early 1970s with investigation into how radars could discriminate between targets and decoys. This effort led to the development of a new signal processing technology based on short-term moving-window Fourier transform analysis, which was named Target Motion Resolution (TMR) processing; it is also known as Phase Derived Range (PDR) and Doppler Time Intensity (DTI) processing. It has been applied with much success to the analysis of the target motion and signature when the targets are simple, such as missiles and projectiles. The firm has delivered operational TMR software to several test ranges, where it is used in production environments to extract accurate vehicle trajectories and flight dynamics measurements from raw radar signals. The firm has also developed innovative techniques for the analysis of more complicated targets. Examination of high-resolution SAR imagery showed that the concept of matched filtering is not valid for man-made targets when resolution is high; the phase of the processor output contains information that is essential for modern radar applications, and cannot be discarded. This realization led to the development of the firm's Complex-Image Analysis technology. Significant advances in detection and identification performance have been demonstrated in small-scale automated tests of the Complex-Image Analysis technology. MARK Resources has also performed pioneering work in the simulation of radar systems and signals. The firm has developed several computer based systems for simulating signals for real-time input into radar receivers under test, and over 30 large-scale programs for simulating all types of target and clutter environments. Several complete "turnkey" simulation sytems have been built and delivered to organizations involved in the testing of airborne radars. These systems inject signals into a selected radar component at real-time data rates and respond dynamically to the state of the radar and its simulated environment. A number of fast signal generation techniques have been invented to realistically emulate the returns from airborne targets, ground clutter, and chaff at the digitized video level or at analog IF or RF interfaces.
