Slant range depends upon orbital mechanics, which depends on mission altitude which depends upon launcher and launch slot opportunities. Slant range is a fact of life. LoRa isn't. How many comm protocols and modulation schemes are there? Let's be clear to say what needs to be said. The latest whiz bang comm protocol or mod scheme, or whatever, still needs to present at the receiver an adequate signal level, and in the case of LoRa an additional constraint of a upper limit of round trip time. Also there is undoubtedly processing delay in the signal chain.
Compared to that, lower single carrier (not FHSS, or DSSS type which is LoRa) or analog waveforms are likely to have greater range and guaranteed levels of operation for the all important command stream.
How would LoRa work when and if the spacecraft is tumbling compared to analog AM/FM or BPSK? When stabilized.. for sure, other comm protocols can be used.
The original poster did not specify if the vehicle has attitude stabilization and control so that os also a big deal to consider .
Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone Get Outlook for Androidhttps://aka.ms/AAb9ysg ________________________________ From: I2OIM [email protected] Sent: Saturday, October 29, 2022 1:27:02 PM To: Samudra Haque [TTLLC] [email protected] Cc: Ashhar Farhan [email protected]; AMSAT BB [email protected] Subject: Re: [AMSAT-BB] Re: Any lora sats active?
Slants depends on the antenna, not on protocol...
Pietro I2OIM
Il sab 29 ott 2022, 18:52 Samudra Haque [TTLLC] <[email protected]mailto:[email protected]> ha scritto: What max slant range? LoRa has architecture constraints... it's purposely time constrained for link quality. Longest so far is terrestrial about 766km I believe
https://lora-alliance.org/lorawan-news/lorawanr-distance-world-record-broken...
But at altitude, your smallsat slant range to ground station will be an issue, should it not?
Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone Get Outlook for Androidhttps://aka.ms/AAb9ysg ________________________________ From: Ashhar Farhan <[email protected]mailto:[email protected]> Sent: Saturday, October 29, 2022 9:24:47 AM To: AMSAT BB <[email protected]mailto:[email protected]> Subject: [AMSAT-BB] Any lora sats active?
I planning a mission that could use lora modulation for telemetry/command. Does anyone know the status of fossasat and lorasat, etc? Also, what is Amsat/IARU stand on use of Lora (a proprietory protocol) on ham bands? I wish we had a standard weak signal protocol for amatuer sats that is doppler insensitive. - f
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