By Scott O’Neill

Contains complete colour and black and white illustrations, This guide is designed to assist digital war and radar structures engineers in making normal estimations concerning features of structures. This guide is subsidized by way of the NAVAIR Director of digital war / strive against structures. Chapters comprise: basics; Antennas; Radar Equations; Radar and Receiver features and try out; Microwave / RF elements; Electro-optics an IR; plane Dynamics issues; Date move Busses; thesaurus; Abbreviations and Acronyms. contains CD with extra reference and path fabrics fabrics

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This explains why efficiency also gets lower for wider beamwidth antennas. EFFECTIVE CAPTURE AREA Effective capture area (Ae) is the product of the physical aperture area (A) and the aperture efficiency (0) or: Ae ' 0 A ' 82G 4B [11] GAIN AS A FUNCTION OF APERTURE EFFICIENCY The Gain of an antenna with losses is given by: G ' 4B0A 82 Where 0 ' Aperture Efficiency A ' Physical aperture area 8 ' wavelength [12] Note that the gain is proportional to the aperture area and inversely proportional to the square of the wavelength.

The amplitude of the power level follows a Carrier Amplitude Modulated by a Square Wave sine x / x type distribution. Detected Signal Figure 4. 1 Figure 5 shows the pulse width (PW) in the time domain which defines the lobe width in the frequency domain (Figure 6). The width of the main lobe is 2/PW, whereas the width of a side lobe is 1/PW. Figure 5 also shows the pulse repetition interval (PRI) or its reciprocal, pulse repetition frequency (PRF), in the time domain. In the frequency domain, the spectral lines inside the lobes are separated by the PRF or 1/PRI, as shown in Figures 7 and 8.

A single spectral line. The spacing of the lobes remains constant with constant PW. RF Measurements - If the receiver bandwidth is smaller than the PRF, the receiver will respond to one spectral line at a time. If the receiver bandwidth is wider than the PRF but narrower than the reciprocal of the PW, the receiver will respond to one spectral envelope at a time. Jet Engine Modulation (JEM) Section 2-6 addresses the Doppler shift in a transmitted radar signal caused by a moving target. The amount of Doppler shift is a function of radar carrier frequency and the speed of the radar and target.

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