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hirokawa / cssrlib-data

Sample scripts and dataset for CSSRlib
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correction format #23

Closed peiyzhou closed 1 year ago

peiyzhou commented 1 year ago

Dear Dr Hirokawa,

I tried to decode septentrio sbf files using your decode_sbf.py. However, the obtained corrections have different format compared to the examples. It would greatly appreciated if you could provide some hints on how to generate the required correction file format.

The example corrections: 2274 511174 59 6 64 126a80490040011000440011000440011000440011000580f71000582f5e046c81de3fa98400110004806a10006801f1000680de2003c4001002c219bc000000

My decoded corrections: 2274 511174 59 34 124 ec00e6a4f48c4101eec3f825f969e2abe8cfe871ec180002180ce81d002d1241a751d671e78201c00012407470f5c175ea7952fad3fb0c7bee00003a0a0b08a11df2ad59b49097eea8633c2ffa35f2e76c348424217d36cf066c1b2f520c9e7f65e2d92653cc8d724a2988d2da632e127bbeeb0a0285bcda787f2100

Many thanks

hirokawa commented 1 year ago

Dear Peiyuan,

Thank you for the feedback. I think that you are trying to decode BDS prn 59, but not B2b signal because the data length is different. Please check that if you are decoding the correct channel.

Rui

From mobile

2023年10月16日(月) 16:07 Peiyuan Zhou @.***>:

Dear Dr Hirokawa,

I tried to decode septentrio sbf files using your decode_sbf.py. However, the obtained corrections have different format compared to the examples. It would greatly appreciated if you could provide some hints on how to generate the required correction file format.

The example corrections: 2274 511174 59 6 64 126a80490040011000440011000440011000440011000580f71000582f5e046c81de3fa98400110004806a10006801f1000680de2003c4001002c219bc000000

My decoded corrections: 2274 511174 59 34 124 ec00e6a4f48c4101eec3f825f969e2abe8cfe871ec180002180ce81d002d1241a751d671e78201c00012407470f5c175ea7952fad3fb0c7bee00003a0a0b08a11df2ad59b49097eea8633c2ffa35f2e76c348424217d36cf066c1b2f520c9e7f65e2d92653cc8d724a2988d2da632e127bbeeb0a0285bcda787f2100

Many thanks

— Reply to this email directly, view it on GitHub https://github.com/hirokawa/cssrlib-data/issues/23, or unsubscribe https://github.com/notifications/unsubscribe-auth/AADHSLXXXBC2CUPRUBMTDT3X7U5RFAVCNFSM6AAAAAA6CIIHK6VHI2DSMVQWIX3LMV43ASLTON2WKOZRHE2DKMZQGIZDANQ . You are receiving this because you are subscribed to this thread.Message ID: @.***>

peiyzhou commented 1 year ago

Dear Dr Hirokawa,

Thank you so much for the reply. Yes, I am using your decode_sbf.py for obtaining B2b corrections from the raw sbf files generated by Septentrio mosaic X5 receiver.

After doing some work, I guess that the decode_sbf.py and cssr_bds.py are not compatible. The decode_sbf.py only generates 984 symbols of a BDS B2b navigation frame, but the cssr_bds.py requires 486 bits data buff (referring to Figure 6-1 of the PPP-B2B ICD). The LDPC(162, 81) decoding to transfer symbols to bits therefore should be added. On the other hand, the example b2b data is already decoded into bits format, rather than symbols, so the PPP-B2b runs well.

Many thanks

Peiyuan

hirokawa commented 1 year ago

Hello Peiyuan,

Thank you for the feedback. Yes, you are correct, Septentrio receiver outputs undecided message, we should decode the message.

The original message is from Javad receiver which outputs decoded message.

Best regards, Rui Hirokawa

From mobile

2023年10月17日(火) 14:46 Peiyuan Zhou @.***>:

Dear Dr Hirokawa,

Thank you so much for the reply. Yes, I am using your decode_sbf.py for obtaining B2b corrections from the raw sbf files generated by Septentrio mosaic X5 receiver.

After doing some work, I guess that the decode_sbf.py and cssr_bds.py are not compatible. The decode_sbf.py only generates 984 symbols of a BDS B2b navigation frame, but the cssr_bds.py requires 486 bits data buff (referring to Figure 6-1 of the PPP-B2B ICD). The LDPC(162, 81) decoding to transfer symbols to bits therefore should be added. On the other hand, the example b2b data is already decoded into bits format, rather than symbols, so the PPP-B2b runs well.

Many thanks

Peiyuan

— Reply to this email directly, view it on GitHub https://github.com/hirokawa/cssrlib-data/issues/23#issuecomment-1766347889, or unsubscribe https://github.com/notifications/unsubscribe-auth/AADHSLWV5X3C4CXPIZGPUALX7Z42LAVCNFSM6AAAAAA6CIIHK6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTONRWGM2DOOBYHE . You are receiving this because you commented.Message ID: @.***>

peiyzhou commented 1 year ago

Thanks. I will close the issue for now.

NavSesne commented 1 year ago

Hello Peiyuan, Thank you for the feedback. Yes, you are correct, Septentrio receiver outputs undecided message, we should decode the message. The original message is from Javad receiver which outputs decoded message. Best regards, Rui Hirokawa From mobile 2023年10月17日(火) 14:46 Peiyuan Zhou @.>: … Dear Dr Hirokawa, Thank you so much for the reply. Yes, I am using your decode_sbf.py for obtaining B2b corrections from the raw sbf files generated by Septentrio mosaic X5 receiver. After doing some work, I guess that the decode_sbf.py and cssr_bds.py are not compatible. The decode_sbf.py only generates 984 symbols of a BDS B2b navigation frame, but the cssr_bds.py requires 486 bits data buff (referring to Figure 6-1 of the PPP-B2B ICD). The LDPC(162, 81) decoding to transfer symbols to bits therefore should be added. On the other hand, the example b2b data is already decoded into bits format, rather than symbols, so the PPP-B2b runs well. Many thanks Peiyuan — Reply to this email directly, view it on GitHub <#23 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AADHSLWV5X3C4CXPIZGPUALX7Z42LAVCNFSM6AAAAAA6CIIHK6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTONRWGM2DOOBYHE . You are receiving this because you commented.Message ID: @.>

Dear Dr Hirokawa,

Do you have any suggestions to convert the LDPC symbols of Septentrio mosaic X5 receiver sbf files?