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By Paul Hare

The Army's Balloon manufacturing unit relocated to Farnborough in 1904 and was once renamed the Royal airplane manufacturing facility in 1912, turning into a fix facility for broken aeroplanes. this can be a background of the manufacturing unit, from the early ballooning and kite experiments to the ambitious SE5.

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Extra info for Aeroplanes of the Royal Aircraft Factory (Crowood Aviation Series)

Sample text

In many systems, the declaration of detection and the institution of tracking has been taken out of the hands of the operator and made the responsibility of the computer. 2 Continuous Wave Radars The simplest type of radar, and the type first demonstrated by Hulsmeyer in 1903, is the CW radar. As noted earlier, an unmodulated CW radar has the significant limitation of providing no range information. Nevertheless CW radars are of historical importance, and they probably still represent the most widely used type of system in their application as speed measuring devices.

Modern radars are generally computer controlled and do their signal processing digitally. Analog-to-digital (AfD) convertors are used to provide the digital signal required for further processing. Some details about typical processing schemes employed are covered in discussing examples of radar systems. The final components of the radar are the indicator and operator. Although simple plan position indicator (PPI) scopes depicting signals that have been subjected to little other than amplification and detection are still in use, modern radars typically present the operator a highly processed display.

Current applications of FM-CW include altimeters, tracking radars, and high-resolution instrumentation systems. Another method of providing a timing mark is by phase coding the CW signal. Either a binary or a polyphase code can be used. In binary coding the signal is divided into segments, with a +1 represented by 0° phase and a zero represented by a 180° phase shift with respect to the carrier. The return signal can then be correlated with a delayed version of the transmitted code to produce range discrimination approximately equal to half the bit length.

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