tailieunhanh - MATHEMATICAL NOTATION

Tham khảo tài liệu 'mathematical notation', kỹ thuật - công nghệ, tự động hoá phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | MATHEMATICAL NOTATION The radar and Electronic Warfare communities generally accept some commonly used notation for the various parameters used in radar and EW calculations. For instance P is almost always power and G is almost always gain. Textbooks and reference handbooks will usually use this common notation in formulae and equations. A significant exception is the use of a for space loss. Most textbooks don t develop the radar equation to its most usable form as does this reference handbook therefore the concept of a just isn t covered. Subscripts are a different matter. Subscripts are often whatever seems to make sense in the context of the particular formula or equation. For instance power may be P PT Pt ormaybe P1 . In the following list generally accepted notation is given in the left hand column with no subscripts. Subscripted notation in the indented columns is the notation used in this handbook and the notation often but not always used in the EW community. a Space loss a i One way space loss transmitter to receiver a2 Two way space loss transmitter to target including radar cross section and back to the receiver a1t One way space loss radar transmitter to target bistatic a1r One way space loss target to radar receiver bistatic Other notation such as atm may be used to clarify specific losses in this case the space loss between a target and missile seeker which could also be identified as a1r . A Antenna aperture capture area Ae Effective antenna aperture A Angstrom B Bandwidth to 3dB points Bif 3 dB IF bandwidth of the receiver pre-detection Bj Bandwidth of the jamming spectrum BmHz 3 dB bandwidth in MHz Bn Equivalent noise bandwidth . B Bv 3 dB video bandwidth of the receiver post-detection Subscript V stands for video BF Bandwidth reduction factor jamming spectrum wider than the receiver bandwidth BW Beamwidth to 3 dB points c Speed of Light f Frequency radio frequency fc Footcandle SI unit of illuminance fD Doppler frequency fR Received .