Aeronautical Engineering

Phased-Array Radar Design - Application of Radar by Tom Jeffrey

By Tom Jeffrey

This ebook is a text-reference designed for electric engineering graduate scholars in addition to for company in-house education courses for radar layout engineers, particularly platforms engineers and analysts who wish to achieve hands-on, useful wisdom and talents in radar layout basics, complex radar recommendations, trade-offs for radar layout and radar functionality research. it is a concise but entire remedy of the connection among mission-level requisites and particular and software program requisites and features. It covers all levels of layout and improvement, together with the advance of preliminary options and total process requisites, method structure, and software program subsystem requisites, distinct algorithms and approach integration and attempt. instead of being a conception and derivations-type, this e-book is applications-oriented making it varied from different released works in this topic.

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39) 22 Chapter 1 Equivalently, for a Swerling I target fluctuation (slow fluctuation—scan-to-scan), the required SNR is given by: SNR REQ = n PFA − 1. 36) that do not have a closed-form solution, numerical integration can be used to evaluate PD. PD has been evaluated for many target models and is documented in texts such as references [6] and [7]. 38) is function of two parameters, PFA and σ2. 2. The noise power, σ2, is established by the receiver noise figure or system noise temperature (Ts) that appears in the denominator of the expression for the RRE.

33) 20 Chapter 1 When δR is ≥ target “length,” a single return occurs at the radar that is a sum of the complex-valued individual scattering components. RCS fluctuations arise due to constructive and destructive combination of individual scattering center components within the resolution-limited waveform bandwidth. However, when δR << target “length,” multiple scattering returns are resolved in range (resulting in little or no RCS fluctuation). , Swerling Models I-IV, log-normal) were developed to allow detection analysis to be performed without having actual RCS data versus viewing angle.

8 illustrates the PD waveform and its processing. , coherent target gain, mitigates nonzero Doppler clutter). However, the specific “post processing” associated with Doppler processing needs to be described. First, some form of automatic detection processing is desirable. A constant false alarm rate (CFAR) processor is usually employed for this purpose. 8 47 Pulse-Doppler Waveforms and Processing figuration typically used is a CFAR processor subsequent to each Doppler filter. Next, the filters dominated by clutter must be identified and ignored for subsequent targets return candidacy.

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