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<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;"><span style="font-size: 20px;">Dear</span> <span style="background-color: rgb(255, 255, 255); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols;">Xiongwen
He,</span></div>
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I have included both the SLP WG as well as the RF&Modulation WG for comment on your questions below.</div>
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The Physical Layer of Proximity-1 was originally part of one blue book which also incorporated the synchronization and channel coding aspects as well.</div>
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>From a historical perspective, I can answer your questions. However, for the physical layer issues/questions please contact Enrico Vassallo who is the RFM WG chairman. For synchronization and channel coding issues/questions please contact Massimo Bertinelli,
who is the Coding & Synchronization (C&S) WG chairman.</div>
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<span style="font-weight:bold">From: </span>he xiongwen <<a href="mailto:hexw501@hotmail.com">hexw501@hotmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Wednesday, September 28, 2016 at 7:20 AM<br>
<span style="font-weight:bold">To: </span>"Kazz, Greg J (313B)" <<a href="mailto:greg.j.kazz@jpl.nasa.gov">greg.j.kazz@jpl.nasa.gov</a>><br>
<span style="font-weight:bold">Subject: </span>µªÎ`: Questions about Proximity -1 space data link protocol<br>
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<p>Dear Mr. <span>Greg Kazz,</span></p>
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<p><span>I have some other questions about Proximity -1 space data link protocol-Physical layer. I hope you can help me.</span></p>
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<p><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">a) In </span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">3.2.1 Table3-1</span><br>
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<p><span><span><b>Why the modulation of E2d devices is different? What are microprobes¡H </b></span></span></p>
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<div>** From a historical perspective, the prototypical E2d device we had in mind was a micro-probe. NASA sent a micro-probe to Mars called Deep Space 2 (DS-2), deployed from the Mars Polar Lander in 2000, which unfortunately failed to communicate. **</div>
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<span>b) In <span>3.3.2.4.1 </span></span></p>
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<span><span>" The following three <span style="color: rgb(255, 0, 0);">additional</span> channels (fixed single forward and return frequency pairs) are defined for Proximity-1 operations: "</span></span></p>
<p><b><font face="Calibri,Arial,Helvetica,sans-serif"><span style="font-size: 12pt;">Why is "additional" used? ** The first channel, channel 1 defined in the specification is the hailing channel. Additional means after this first channel, </span><span style="font-size: 16px;">I</span><span style="font-size: 12pt;">.e.,
channels 0, 2, 3 in this case **</span></font></b></p>
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<b>What's the use case for channel 4~7 and channel 8~15¡H** It is the job of the program or project to define these. Currently, no agency has found a need to provide a frequency assignment for these channels yet **</b></p>
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<span>c) <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">In </span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">3.4.5.1</span></span></p>
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<span style="font-size:12pt"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"></span></span></span></span></span></div>
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<span style="font-size:12pt"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><span>NOTES 1 The Doppler
frequency rate does not include the Doppler rate required for tracking canister or worst-case spacecraft-to-spacecraft cases. </span><br>
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<div><b style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">Why doesn't </b><b style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">The
Doppler frequency rate </b><b><font face="Calibri,Arial,Helvetica,sans-serif,Apple Color Emoji,Segoe UI Emoji,NotoColorEmoji,Segoe UI Symbol,Android Emoji,EmojiSymbols"><span style="font-size: 16px;">include the two cases¡H** From a historical perspective,
the Doppler freq. rate requirement was very generic and was assumed to meet most of the user¡¦s use cases expect for very demanding performance cases such as tracking a canister or worst-case spacecraft-to-spacecraft tracking scenarios **</span></font></b></div>
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<span style="font-size:12pt"><span><span><span><span style="font-family:Calibri,Arial,Helvetica,sans-serif,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px"><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
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<span style="font-size:12pt"><span><span><span><span style="font-family:Calibri,Arial,Helvetica,sans-serif,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px"><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
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<span style="font-size:12pt"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">I would appreciated it if
you could reply and help me clarify the questions.</span></span></span></span></span></div>
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<span style="font-size:12pt"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
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<span style="font-size:12pt"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">Best Regards,</span></span></span></span></span></div>
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<span style="font-size:12pt"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">Xiongwen He</span></span></span></span></span></div>
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<span style="font-size:12pt"><span><span><span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;"><br>
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<span style="font-size:12pt"><span><span><span><span style="font-family:Calibri,Arial,Helvetica,sans-serif,"Apple Color Emoji","Segoe UI Emoji",NotoColorEmoji,"Segoe UI Symbol","Android Emoji",EmojiSymbols; font-size:16px"><span style="font-family: Calibri, Arial, Helvetica, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', NotoColorEmoji, 'Segoe UI Symbol', 'Android Emoji', EmojiSymbols; font-size: 16px;">China
Academy of Space Technology(CAST)</span></span></span></span></span></span></div>
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