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Experimental Study of LoRa Modulation Immunity to Doppler Effect in CubeSat Radio Communications
Currently, LoRa technology is one of the most promising technologies in satellite Internet of Things. Particularly those based on satellite constellations in low Earth orbit, including the CubeSat nanosatellite constellations. However, the LoRa specification does not contain clear criteria for the a...
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Published in: | IEEE access 2019, Vol.7, p.75721-75731 |
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description | Currently, LoRa technology is one of the most promising technologies in satellite Internet of Things. Particularly those based on satellite constellations in low Earth orbit, including the CubeSat nanosatellite constellations. However, the LoRa specification does not contain clear criteria for the applicability of the LoRa modulation under strong Doppler effect conditions caused by the very high speed of satellites. This is especially true in the case of the dynamic Doppler effect when the Doppler frequency shift changes rapidly with time. This paper presents the results of laboratory testing and outdoor experiments conducted to determine the feasibility of the LoRa modulation in CubeSat radio communication systems. Additionally, possible restrictions associated with the Doppler effect were explored. The experiments showed that the LoRa modulation has very high immunity to the Doppler effect. This immunity allows for the use of LoRa modulation in satellite radio communications in orbits above 550 km without any restrictions associated with the Doppler effect. In lower orbits, the dynamic Doppler effect leads to the destruction of the satellite-to-Earth radio channel when using the LoRa modulation mode with a maximum spreading factor of \textit {SF} = 12 . This destruction occurs when the satellite is flying directly above the ground station, resulting in reduced duration of the radio communication session. The reduction in the duration of a communication session increases with decreasing orbit altitude and reaches about one minute in an ultra-low orbit 200 km high. |
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Particularly those based on satellite constellations in low Earth orbit, including the CubeSat nanosatellite constellations. However, the LoRa specification does not contain clear criteria for the applicability of the LoRa modulation under strong Doppler effect conditions caused by the very high speed of satellites. This is especially true in the case of the dynamic Doppler effect when the Doppler frequency shift changes rapidly with time. This paper presents the results of laboratory testing and outdoor experiments conducted to determine the feasibility of the LoRa modulation in CubeSat radio communication systems. Additionally, possible restrictions associated with the Doppler effect were explored. The experiments showed that the LoRa modulation has very high immunity to the Doppler effect. This immunity allows for the use of LoRa modulation in satellite radio communications in orbits above 550 km without any restrictions associated with the Doppler effect. In lower orbits, the dynamic Doppler effect leads to the destruction of the satellite-to-Earth radio channel when using the LoRa modulation mode with a maximum spreading factor of <inline-formula> <tex-math notation="LaTeX">\textit {SF} = 12 </tex-math></inline-formula>. This destruction occurs when the satellite is flying directly above the ground station, resulting in reduced duration of the radio communication session. The reduction in the duration of a communication session increases with decreasing orbit altitude and reaches about one minute in an ultra-low orbit 200 km high.</description><identifier>ISSN: 2169-3536</identifier><identifier>EISSN: 2169-3536</identifier><identifier>DOI: 10.1109/ACCESS.2019.2919274</identifier><identifier>CODEN: IAECCG</identifier><language>eng</language><publisher>Piscataway: IEEE</publisher><subject>Communications systems ; Cubesat ; CubeSat radio communication ; Destruction ; Doppler effect ; Doppler shift ; Frequency shift ; Ground stations ; Immunity ; Internet of Things ; laboratory testing ; Laboratory tests ; LoRa modulation ; Low earth orbits ; Modulation ; multipath propagation ; Nanosatellites ; Orbits ; outdoor experiments ; Radio communications ; Radio transmitters ; Receivers ; Satellite broadcasting ; Satellite constellations ; Satellites</subject><ispartof>IEEE access, 2019, Vol.7, p.75721-75731</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c474t-1989e66e3512f1e0096299996c78ee487789b3a160a2cb7f6f7c83d33b311f193</citedby><cites>FETCH-LOGICAL-c474t-1989e66e3512f1e0096299996c78ee487789b3a160a2cb7f6f7c83d33b311f193</cites><orcidid>0000-0001-8538-0599</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/8723123$$EHTML$$P50$$Gieee$$Hfree_for_read</linktohtml><link.rule.ids>314,780,784,4024,27633,27923,27924,27925,54933</link.rule.ids></links><search><creatorcontrib>Doroshkin, Alexander A.</creatorcontrib><creatorcontrib>Zadorozhny, Alexander M.</creatorcontrib><creatorcontrib>Kus, Oleg N.</creatorcontrib><creatorcontrib>Prokopyev, Vitaliy Yu</creatorcontrib><creatorcontrib>Prokopyev, Yuri M.</creatorcontrib><title>Experimental Study of LoRa Modulation Immunity to Doppler Effect in CubeSat Radio Communications</title><title>IEEE access</title><addtitle>Access</addtitle><description>Currently, LoRa technology is one of the most promising technologies in satellite Internet of Things. Particularly those based on satellite constellations in low Earth orbit, including the CubeSat nanosatellite constellations. However, the LoRa specification does not contain clear criteria for the applicability of the LoRa modulation under strong Doppler effect conditions caused by the very high speed of satellites. This is especially true in the case of the dynamic Doppler effect when the Doppler frequency shift changes rapidly with time. This paper presents the results of laboratory testing and outdoor experiments conducted to determine the feasibility of the LoRa modulation in CubeSat radio communication systems. Additionally, possible restrictions associated with the Doppler effect were explored. The experiments showed that the LoRa modulation has very high immunity to the Doppler effect. This immunity allows for the use of LoRa modulation in satellite radio communications in orbits above 550 km without any restrictions associated with the Doppler effect. In lower orbits, the dynamic Doppler effect leads to the destruction of the satellite-to-Earth radio channel when using the LoRa modulation mode with a maximum spreading factor of <inline-formula> <tex-math notation="LaTeX">\textit {SF} = 12 </tex-math></inline-formula>. This destruction occurs when the satellite is flying directly above the ground station, resulting in reduced duration of the radio communication session. The reduction in the duration of a communication session increases with decreasing orbit altitude and reaches about one minute in an ultra-low orbit 200 km high.</description><subject>Communications systems</subject><subject>Cubesat</subject><subject>CubeSat radio communication</subject><subject>Destruction</subject><subject>Doppler effect</subject><subject>Doppler shift</subject><subject>Frequency shift</subject><subject>Ground stations</subject><subject>Immunity</subject><subject>Internet of Things</subject><subject>laboratory testing</subject><subject>Laboratory tests</subject><subject>LoRa modulation</subject><subject>Low earth orbits</subject><subject>Modulation</subject><subject>multipath propagation</subject><subject>Nanosatellites</subject><subject>Orbits</subject><subject>outdoor experiments</subject><subject>Radio communications</subject><subject>Radio transmitters</subject><subject>Receivers</subject><subject>Satellite broadcasting</subject><subject>Satellite constellations</subject><subject>Satellites</subject><issn>2169-3536</issn><issn>2169-3536</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>ESBDL</sourceid><sourceid>DOA</sourceid><recordid>eNpNUV1L7DAQLeIFRf0FvgR83jWTtPl4lLrqwsoF997nmKYT6dJtapqC---tWxHnZYbDOWdmOFl2DXQJQPXtXVmuttslo6CXTINmMj_JzhkIveAFF6e_5rPsahh2dCo1QYU8z15XHz3GZo9dsi3ZprE-kODJJrxY8hzqsbWpCR1Z7_dj16QDSYHch75vMZKV9-gSaTpSjhVubSIvtm4CKcOR7I7K4TL742074NV3v8j-P6z-lU-Lzd_HdXm3Wbhc5mkBWmkUAnkBzANSqgXTUwknFWKupFS64hYEtcxV0gsvneI15xUH8KD5Rbaefetgd6afXrLxYIJtzBEI8c3YmBrXoqm1EpXmzin0ufOFciALJakFWXNXw-R1M3v1MbyPOCSzC2PspvMNy4tCQM5ATiw-s1wMwxDR_2wFar6SMXMy5isZ853MpLqeVQ0i_iiUZBwY559A1oje</recordid><startdate>2019</startdate><enddate>2019</enddate><creator>Doroshkin, Alexander A.</creator><creator>Zadorozhny, Alexander M.</creator><creator>Kus, Oleg N.</creator><creator>Prokopyev, Vitaliy Yu</creator><creator>Prokopyev, Yuri M.</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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Particularly those based on satellite constellations in low Earth orbit, including the CubeSat nanosatellite constellations. However, the LoRa specification does not contain clear criteria for the applicability of the LoRa modulation under strong Doppler effect conditions caused by the very high speed of satellites. This is especially true in the case of the dynamic Doppler effect when the Doppler frequency shift changes rapidly with time. This paper presents the results of laboratory testing and outdoor experiments conducted to determine the feasibility of the LoRa modulation in CubeSat radio communication systems. Additionally, possible restrictions associated with the Doppler effect were explored. The experiments showed that the LoRa modulation has very high immunity to the Doppler effect. This immunity allows for the use of LoRa modulation in satellite radio communications in orbits above 550 km without any restrictions associated with the Doppler effect. In lower orbits, the dynamic Doppler effect leads to the destruction of the satellite-to-Earth radio channel when using the LoRa modulation mode with a maximum spreading factor of <inline-formula> <tex-math notation="LaTeX">\textit {SF} = 12 </tex-math></inline-formula>. This destruction occurs when the satellite is flying directly above the ground station, resulting in reduced duration of the radio communication session. The reduction in the duration of a communication session increases with decreasing orbit altitude and reaches about one minute in an ultra-low orbit 200 km high.</abstract><cop>Piscataway</cop><pub>IEEE</pub><doi>10.1109/ACCESS.2019.2919274</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0001-8538-0599</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Communications systems Cubesat CubeSat radio communication Destruction Doppler effect Doppler shift Frequency shift Ground stations Immunity Internet of Things laboratory testing Laboratory tests LoRa modulation Low earth orbits Modulation multipath propagation Nanosatellites Orbits outdoor experiments Radio communications Radio transmitters Receivers Satellite broadcasting Satellite constellations Satellites |
title | Experimental Study of LoRa Modulation Immunity to Doppler Effect in CubeSat Radio Communications |
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