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
This should get you pointed in the right direction regarding LORA satellites
cheers, Graham ve3gtc
On Sat, Oct 29, 2022 at 9:25 AM Ashhar Farhan farhanbox@gmail.com wrote:
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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You may also refer to https://tinygs.com/
Bob M. N6RFM
On Oct 29, 2022, at 09:26, Ashhar Farhan farhanbox@gmail.com wrote:
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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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 farhanbox@gmail.com Sent: Saturday, October 29, 2022 9:24:47 AM To: AMSAT BB amsat-bb@amsat.org 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
Slants depends on the antenna, not on protocol...
Pietro I2OIM
Il sab 29 ott 2022, 18:52 Samudra Haque [TTLLC] sehaque@tekterrain.com 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 Android https://aka.ms/AAb9ysg
*From:* Ashhar Farhan farhanbox@gmail.com *Sent:* Saturday, October 29, 2022 9:24:47 AM *To:* AMSAT BB amsat-bb@amsat.org *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
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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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 i2oim@arivigevano.net Sent: Saturday, October 29, 2022 1:27:02 PM To: Samudra Haque [TTLLC] sehaque@tekterrain.com Cc: Ashhar Farhan farhanbox@gmail.com; AMSAT BB amsat-bb@amsat.org 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] <sehaque@tekterrain.commailto:sehaque@tekterrain.com> 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 <farhanbox@gmail.commailto:farhanbox@gmail.com> Sent: Saturday, October 29, 2022 9:24:47 AM To: AMSAT BB <amsat-bb@amsat.orgmailto:amsat-bb@amsat.org> 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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View archives of this mailing list at https://mailman.amsat.org/hyperkitty/list/amsat-bb@amsat.org To unsubscribe send an email to amsat-bb-leave(a)amsat.orghttp://amsat.org Manage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org
On 10/29/22 08:24, Ashhar Farhan wrote:
Also, what is Amsat/IARU stand on use of Lora (a proprietory protocol) on ham bands?
Please consider not propagating the use of this patented, proprietary modulation/protocol combination.
The reasons to use a chirped spread-spectrum mode would be:
1) Interference avoidance -- not a factor when pointing out into space, I would think.
2) Multi-path resistant -- again, there isn't a multi-path fading (frequency-specific) issue to deal with. Coded and interleaved data can deal with burst noise and time-varying fading.
3) Doppler resistance -- Many modems (AX5043, for instance) have a PLL/FLL to track out much of this change, and inter-packet micro-steps of the tuned frequency can also be used.
What is your proposed link budget? Are you looking to hit a specific spec, or is your proposed use due to the fact that "it is easy to use"?
--- Zach N0ZGO
(Not a fan: AMBE, LoRA, etc.)
participants (6)
-
Ashhar Farhan -
Graham c -
I2OIM -
Robert Mattaliano -
Samudra Haque [TTLLC] -
Zach Metzinger