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<blockquote data-quote="BDF" data-source="post: 88620" data-attributes="member: 2764"><p>Some other known techniques are High Range Resolution (or HRR) and ISAR. This website shows some of this in surprising detail:</p><p></p><p>http://www.ottawa.drdc-rddc.gc.ca/html/rast_309_nctr-eng.html</p><p></p><p>These techniques benefit from better signal processing, precise beam control, and higher bandwidth radars that are available now in the form of AESAs. There just wasn't enough processing power (or perhaps beam control) in the APG-63/70 during the timeframe the MSIP II Eagles entered service during the late 80s to use these techniques. The newer APG-63(v)1 and 2 may have adequate signal processing but I'm not certain. JEM doesn't really "count" the blades, but looks for a specific "warble" pattern in the return. It can only be accomplished in STT as the beam needs to dwell on the target long enough to observe the modulation. Obviously it's aspect dependent and hence there's a requirement for other sources of ID (such as AWACS) as part of their EID matrix. </p><p></p><p>BDF</p></blockquote><p></p>
[QUOTE="BDF, post: 88620, member: 2764"] Some other known techniques are High Range Resolution (or HRR) and ISAR. This website shows some of this in surprising detail: http://www.ottawa.drdc-rddc.gc.ca/html/rast_309_nctr-eng.html These techniques benefit from better signal processing, precise beam control, and higher bandwidth radars that are available now in the form of AESAs. There just wasn't enough processing power (or perhaps beam control) in the APG-63/70 during the timeframe the MSIP II Eagles entered service during the late 80s to use these techniques. The newer APG-63(v)1 and 2 may have adequate signal processing but I'm not certain. JEM doesn't really "count" the blades, but looks for a specific "warble" pattern in the return. It can only be accomplished in STT as the beam needs to dwell on the target long enough to observe the modulation. Obviously it's aspect dependent and hence there's a requirement for other sources of ID (such as AWACS) as part of their EID matrix. BDF [/QUOTE]
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