IEEE 521-2002 pdf download IEEE Standard Letter Designations for Radar-Frequency Bands
1.Scope
Since World War ll. radar svstems engineers have used letter designations as a short notation for describingthe frequency band of operation. This usage has continued throughout the years and is now an acceptedpractice of radar engineers. Radar-frequency letter designations are used for the following reasons:
1They provide a convenient method for describing the band in which the radar operates without theneed for awkwardly stating the limits of the frequency in numerical terms. For example, it is moreconvenient to say an L-band radar than a 1215-1400 MHz radar. This is especially important in titlesof published papers on radar, in advertising of radar systems and components, or in any other situa-tion where a short notation is desired.
2In military radar systems, the exact frequency of operation cannot usually be disclosed, but it is permissible in many cases to describe the band in which it operates. The letter designations permit thisEach radar-frequency band has its own particular characteristics. Thus an X-band radar will be different from an S-band radar The letter designations are often used in this manner to indicate the par-ticular nature of the radar as it is influenced by its frequency. There are vast differences incharacteristics, applications, and environmental constraints that distinguish radars in the differentbands. lt is the need to communicate concisely the whole set of characteristics which are shared byS-band radar, as distinguished from L-band radar, C-band radar, and the others, which requires theestablished usage of letter designations.
2.Usage
The nomenclature of Table 1 shall be followed when letter designations are used to describe the frequency ofradar operation. When appropriate, it is suggested that the specific International Telecommunications Union(ITU) radiolocation numerical band limits be inserted parenthetically; for example, VHF (216-225 MHz) orL-band(1.215-1.4 GHz)
3. Relation to other nomenclature
The radar letter designations are consistent with the recommended nomenclature of the ITU. as shown inIable 2. Note that the high frequency (HF) and the very high frequency (VHF) definitions are identical in the two systems. The essence of the radar nomenclature is to subdivide the existing ITU bands, in accordancewith radar practice, without conflict or ambiguity.
The letter band designations should not be construed as being a substitute for the specific frequency limits ofthe frequency bands. The specific frequency limits should be used when appropriate, but when a letter designation of a radar-fiequency band is called for, those of Table I shall be used.
The letter designations described in this standard are designed for radar usage and are used in current prac-tice. They are not meant to be used for other radio or telecommunication purposes, unless they pertain toradar.
The letter desienations for clectronic countermcasure operations. as described in Air Force Regulation No55-44. Army Regulation No. 105-86. and Navy OPNAV Instruction 3430.9B, are not consistent with radarpractice and shall not be used to describe radar-frequency bands.
IEEE 521-2002 pdf download
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