Download Understanding Radar Systems by Simon Kingsley PDF
By Simon Kingsley
What's radar? What platforms are presently in use? How do they paintings? knowing Radar platforms offers engineers and scientists with solutions to those serious questions, targeting genuine radar platforms in use this day. it is the ideal source for these simply coming into the sphere or a brief refresher for knowledgeable practitioners. The publication leads readers in the course of the really expert language and calculations that include the complicated global of contemporary radar engineering as visible in dozens of state of the art radar structures. The authors tension functional thoughts that follow to all radar, preserving math to a minimal. many of the ebook is predicated on genuine radar platforms instead of theoretical experiences. the result's a precious, easy-to-use advisor that makes the tough components of the sector more uncomplicated and is helping readers do functionality calculations quick and simply
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Two staggered PRFs are demonstrated in Fig. 2; when PRF (a) is used the target range is measured as 30, 180, or 330 km, but when PRF (b) is used the range is measured as 105 or 330 km. The true range of the target must therefore be 330 km. 30 UNDERSTANDING RADAR SYSTEMS (a) Target! (,-___~____~_. 2 The two PRFs (a) and (b) give ambiguous range information when used independently. In combination, only one range is possible. Historically, low-PRFradars, designed to avoid range ambiguity problems and often using MTI, have become known as MTI systems to distinguish them from high PRF radars.
As an example, suppose we developed a system that transmitted long pulses during which we swept the frequency of the oscillator deliberately to increase the bandwidth; could we achieve greater range accuracy this way? Radars using such modulation schemes are common, and are known as chirp systems when the frequency sweep during a pulse is linear. By careful processing chirp radars do indeed achieve high range accuracy. The other factor determining the accuracy of the range measurement is the signal-to-noise ratio, because of the effect that noise has on corrupting the shape of the pulse.
7 gives some insight into why there is this dependence on bandwidth. The system shown in Fig. 7a emits a single continuous tone and measures the phase of the echo to find a rough position for the target, but it is ambiguous every wavelength. In Fig. 7b a second frequency is added to the transmission to reduce ambiguities and sharpen the position of the target. Adding further frequencies (more bandwidth) eliminates the ambiguities and gives even greater accuracy to the range measurement (Fig. 1.