Mobile phone newbie - part 2

In article , snipped-for-privacy@sabretechnology.co.uk wrote

Base station locations are precisely known. As you move from one place to another the phone 'registers' with the nearest BS for a service. You can see it do this if you watch the display.

All calls including registration are auto logged. By using the formulae Distance / Time = Speed where distance is the distance between BS and time is the interval between registration of the handset then the speed travelled between the two is known.

Call logs from Mobile Networks have been used in prosecutions to prove and disprove statements successfully. I have been told that there have been prosecutions for Traffic Offences using network logs but that is a rare occurance since it does cost a lot.

In article , snipped-for-privacy@sabretechnology.co.uk wrote

There are a number of BS along main routes such as motorways. You will have seen them and the logging center is by the side of the M62. As for accuracy - well that depends on the degree of accuracy you need. To show definate evidence of speeding all you need to do is show a value above the limit in excess of error. In a 70mph limit anything 75 - + would suffice given that it is impossible to get from A-B in less than say 5 minutes unless the speed was in excess of ???

In article , snipped-for-privacy@sabretechnology.co.uk wrote

In practise, inner cities and urban areas are not good for this purpose due to BS overlap. However, in rural areas and along the motorways where cover is at the limit specific to providing service along that route, it is easier.

If you cannot determine who is driving a vehicle registered to you at the time, then there are insurance issues to reflect on. Unless it is proven that the vehicle was being driven without the owners consent, you might have dificulty is disproving any responsibility.

Civilian GPS signals are deliberately hindered to produce a resolution of accuracy no better than 100 mts at best. GSM may - but not always - reduce that margin of error where there is additional information specifically relevent to the area of uncertainty. That is not always the case however, GSM requires only 2 independant signals whereas GPS needs 3 unles height is not an issue. [Terrain altitude]

In article , snipped-for-privacy@hall.nospam wrote

Did he? I was not aware of that.

In article , snipped-for-privacy@mailandnews.com wrote

If you have a closed user group selected. But not always efficient.

In article , snipped-for-privacy@nospam.yahooxxxx.co.uk wrote

Unless they are aware of the next camera location.

I think he means that you have to prove that the phone owner was driving. He could have been riding shotgun for an untraceable friend (sans mobile) who he is unwilling to dob in.

Christian.

In article , kqr writes

No, you couldn't do it that way. You are assuming that handover between base stations occurs at an exact position, but it will vary depending on reception conditions. Also you could be anywhere within the base station's "cell". You can't work anything out just from knowing which cell the phone is registered with. The only thing you can say is that the phone is somewhere within that cell area, and that information has been used in some cases.

If the base stations record tx/rx timing info, as some have suggested, this would give you the distance between the base station and the mobile which would allow you to triangulate a position if several base stations were in contact. I doubt this information is logged though.

snipped-for-privacy@NoSpamSwampieSpammer.Org.Uk wrote

I don't know the current status, but there was a case in the Court of Appeal recently: A driver identified himself to the police by filling in the form, but he hadn't signed it. Therefore it was not admissible as evidence in court and so the police couldn't prove he was driving. IYSWIM.

Neil

I think they have finally overturned that loophole in the courts.

Christian.

snipped-for-privacy@aol.comma wrote

I read somewhere that the position of a mobile can be logged even when it is switched off, but not if the battery is removed. Is this true and if so how is it done?

Peter Scott

The position cannot be monitored while the phone is off, but if you switch the phone off normally, it will send a signal to the base station first. If you pull the battery, it won't. I seem to remember something in the Huntley case that was mentioned this, which may be where you heard it.

kqr wrote in news: snipped-for-privacy@news.individual.net:

What about the 10% speedo inaccuracy? Surely that means 77+ - or is that not allowed now?

Here's the announcement.

.andy

To email, substitute .nospam with .gl

Not any more. See other post. Accuracy is now < 20m

.andy

To email, substitute .nospam with .gl

Yup, as recently shown by the desperate pleading of the Jag driver whose appeal was dismissed. Plus there also this: "a person?s refusal to provide:

- Particulars and information in accordance with a statutory requirement, eg under the Road Traffic Act 1988, may amount to an offence or may make the person liable to a further arrest"

No it is not true. Without any form of power there is no way for it to respond to questioning.