Considering the drivers mobile and the cars 911 modem brings a confusing RF connection situation. The mobile may connects through windows or roof glass toward roadside. The 911 modem is wired to the roof shark fin antenna as a direct airinterface the two signals travel at different speeds and heights. Our roadside RF testing shows 5 connection types
a) mobile to Ant1/2, modem no
b) mobile to Ant1, modem to Ant2 (equals vice versa, therefore skipped)
c) mobile to Ant1, modem to Ant1 (equals both to Ant2, therefore skipped)
d) mobile no, modem to Ant1/2
e) mobile no, modem no
so
a) 1 connection 'leftside'
b) 2 connections nonparallel
c) 2 connections pseudo-parallel
d) 1 connection 'rightside'
e) no connections, but may probe requests/responses
This assumption is not complete. There are many other connection types e.g. V2V, V2P, V2B. To get evidence for any RF connection you have two sides, client-side and Ant-side. We for our testroad got the CSPs CSA logs and logged the Car WiFis to RF identify together with ALPR. To sum we had to decide if we focus on Single Proof SP or Double Proof DP. DP related by speed is hard as the RF environment is changing by clients and Ants as some clients carry Ants. SP was definded for now. As other countries have other LTE bands in use, we wonder what they experience.
Who globally in LEO runs a similar project? We search for collaboration -)
@jaclaz pls spell-check
@jaclaz pls spell-check
The good news ) are that the number of s's in the following sentence is correct.
The mobile may connects through windows or roof glas towards roadside.
The bad news ( are that one s needs to be moved.
jaclaz
Rolf,
Good Day to you Sir. As the end of 2017 draws to a close I hope you have found it to be healthy and profitable. I have many colleagues in the LEO community that would love nothing more than to collaborate on the subject of eSIM Car Accident Forensics. I was wondering if you might share, or PM me the Law Enforcement Only website/forum you are a member of?
After the governing law enforcement association for the website/forum properly vets my colleagues for their current employment with a law enforcement agency we can direct the LEO community to that site and begin the collaboration. With great anticipation I look forward to the exchange of information.
Respectfully!
I was accused multiple times in this forum to unnecessary move content in a walled garden domain. If an issue is not critical that crime can learn off I try to share and collaborate as much as transparent and open as I can (W2L? serie).
For this I on purpose posted the issue openly here.
We only win the crime-LEO battle by getting faster learning openly - on a No-Trust-Basis.