PPS+GPRMC #222

New Issue

2024-03-26T04:28:19+01:00

leomessi999 commented

2024-03-26 04:28:19 +01:00

(Migrated from github.com)

Currently, I am using GPS+PPS for radar time synchronization. I would like to ask what is the role of the PPS signal in the Horizon radar?

TokyoWarfare commented

2025-11-14 02:10:50 +01:00

(Migrated from github.com)

can you disconnect the pps signal from the livox converter 2.0 and see if still works?

If so, may be it would be possible not to use the livox converter 2.0 and instead use a cable like this:

https://es.aliexpress.com/item/1005010019740560.html?spm=a2g0o.productlist.main.5.1570HNuVHNuVWE&algo_pvid=39e04170-42cb-4fc5-b792-6342b5a94cf7&algo_exp_id=39e04170-42cb-4fc5-b792-6342b5a94cf7-4&pdp_ext_f=%7B%22order%22%3A%22-1%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21EUR%2129.14%2117.19%21%21%21234.61%21138.42%21%4021039a5b17630781258593613e8063%2112000050856566631%21sea%21ES%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aa3128444%3Bm03_new_user%3A-29895&curPageLogUid=EwDXctB0V1Kf&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005010019740560%7C_p_origin_prod%3A

Also if you could please share your GPS module and if you used a TTL to USB converter, tx.

can you disconnect the pps signal from the livox converter 2.0 and see if still works? If so, may be it would be possible not to use the livox converter 2.0 and instead use a cable like this: https://es.aliexpress.com/item/1005010019740560.html?spm=a2g0o.productlist.main.5.1570HNuVHNuVWE&algo_pvid=39e04170-42cb-4fc5-b792-6342b5a94cf7&algo_exp_id=39e04170-42cb-4fc5-b792-6342b5a94cf7-4&pdp_ext_f=%7B%22order%22%3A%22-1%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21EUR%2129.14%2117.19%21%21%21234.61%21138.42%21%4021039a5b17630781258593613e8063%2112000050856566631%21sea%21ES%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aa3128444%3Bm03_new_user%3A-29895&curPageLogUid=EwDXctB0V1Kf&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005010019740560%7C_p_origin_prod%3A Also if you could please share your GPS module and if you used a TTL to USB converter, tx.

TokyoWarfare commented

2026-01-16 11:23:12 +01:00

(Migrated from github.com)

I'm now at this stage of integrating the GPS.

The role of the PPS is to reset to 0 the value of the second of the internal clock. Keeping it as much in sync as possible with the clock of the satellite. Hence the timestamped coordinates will be as tightly coupled to the sensor's real world position as possible with whatever the current GPS accuracy is. In short, it is a mean to reduce time drift.

I'm now at this stage of integrating the GPS. The role of the PPS is to reset to 0 the value of the second of the internal clock. Keeping it as much in sync as possible with the clock of the satellite. Hence the timestamped coordinates will be as tightly coupled to the sensor's real world position as possible with whatever the current GPS accuracy is. In short, it is a mean to reduce time drift.

TokyoWarfare commented

2026-01-28 12:29:17 +01:00

(Migrated from github.com)

I've finished integrating the GPS. As I commented in my prior post the purpose of the PPS is to reset the internal clock every sec, setting the ongoing seccond to 0, minimizing the drift son that later the GNRMC/GPRMC timestamp matches the GPS data timestamp

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Reference: mmr/Livox-SDK#222