By P. Lacomme, J.C. Marchais, J.P. Hardange, E. Normant
This new identify presents a complete account of the present kingdom of the most kinds of airborne and spaceborne radar structures. each one process is roofed by way of the fundamental radar rules, services and homes, in addition to the radar's function in the total method and challenge. Given altering operational standards, the authors additionally think of how radar may perhaps evolve into the long run. The e-book merits from the information of the writer workforce, who're operating in a firm thought of to be a centre of excellence for advertisement radar improvement.
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Additional info for Air and Spaceborne Radar Systems An Introduction
2 Thermal Noise As with any electronic receiver system, the ultimate limit on detection of a useful signal depends on the internal noise of the radar receiver. This is known as thermal noise, because of its thermal origin. This subject is more than adequately covered in specialist works on reception. We shall therefore limit ourselves to a reminder of its main characteristics. 1 The Characteristics of Thermal Noise Thermal noise is created by thermal agitation of the electrons in the various elements that make up the receiver.
Fixed targets like bridges or buildings can be designated in geographical coordinates (WGS 84) to the weapon at the Mission Preparation level with data supplied by Surveillance or Reconnaissance missions (if available with sufficient accuracy). In these cases, a weapon with GPS guidance can reach an acceptable accuracy (about 10 m). More and more, however, target recognition prior to weapon delivery is needed because targets of interest can be moved between the reconnaissance mission and the strike (Ballistic Missile Launchers or Sol-Air Defense for example).
In these cases the fighter relies on high-resolution radar (SAR modes—1 m resolution or less) to achieve this task at long range (up to 100 km) in all weather conditions. These high-resolution modes are also required for damage assessment (DA) to evaluate the results of the strike. In addition to high-resolution imaging modes needed for target classification, the radar has to supply an accurate localization of the targets. This requires a very good knowledge of the platform velocity, which is given either by a high- performance inertial unit (coupled to GPS) or by specific radar modes that give a high-accuracy measurement of the platform velocity from ground Doppler velocity estimation.