[SystemSafety] COTS display certification

[Peter Bishop]

Haim

I am not sure how relevant this is, but there is some rail industry
technology that verifies the display output (for specific zones) against
the source data associated with that zone. See:

http://www.deuta.com/en/trust-technologies.aspx

Peter Bishop

On 26/07/2016 09:16, SPRIGGS, John J wrote:
> Hi Haim,
> I am surprised that it is necessary for the operator to be 100% sure
> that the symbol is exactly on the correct spot on the display.  In most
> applications there is an 'annulus of concern' around the 'true'
> position; if the displayed plot is in the hole in the middle, the error
> is not enough to matter and, if it is outside the ring, the error is so
> large that the operator will notice.  It is only on the annulus itself
> that the position error is large enough to matter, but small enough to
> be credible to an operator.
> Also, in some applications, e.g. where the operator has to maintain
> separation between things, it is relative accuracy that matters, not
> absolute.
> As for field data, have you consulted industrial process control
> companies, e.g. a power station?  What displays do they use?  Do they
> collect data from the operation using a robust process, so that failure
> rates can be confidently predicted for the displays (in that environment)?
>  
> John
> *_http://www.linkedin.com/in/johnspriggs_*
> -----Original Message-----
> From: systemsafety
> [mailto:systemsafety-bounces at lists.techfak.uni-bielefeld.de] On Behalf
> Of Haim Kuper
> Sent: 25 July 2016 17:05
> To: systemsafety at lists.techfak.uni-bielefeld.de
> Subject: [SystemSafety] COTS display certification
>  
> Dear System Safety List Members,
>  
> We need to develop and certify a Ground Control Station (GCS) that
> controls an avionic platform.
> The GCS contains an In-house-developed Control Computer (CC) and a COTS
> Display.
> Hazard's analyses of the GCS showed that we need to develop and certify
> to DAL-B.
> Regarding the display:
> 1 - It's usually a problem to verify World-coordinates to
> Display-coordinates conversion results-on-screen so that the operator
> will be 100% sure that the symbol is exactly on the correct spot (on the
> world map/screen).
> 2 - I've asked some famous companies (Acer, Samsung, HP, LG) for any
> supporting data, such as service history (as shown in DO-178C section
> 12.3.4 "Product Service History" )  of failure data, any measured or
> designed-to reliability figures: IMHO, I'll not get any assistance from
> them.
> 3 - We are checking some safety design mechanisms such as
>     a. monitoring using another display
>     b. develop some hardware/software/humanware based Built In Tests, and
>     c. still looking for a creative idea to tackle this subject
>  
> Per your experience, please advise how to certify the COTS display
> within the GCS development.
>  
> Thanks and Regards,
> Haim kuper
>  
>  
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Peter Bishop
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