SYSTEM AND METHOD FOR DETERMINING THE POSITION OF A CONTROL AREA
First Claim
1. A method for determining the position and shape of closed control areas on a segment of road to which a usage charge is applicable, defining a probability pmd of failure to generate usage charges for a segment user and a probability pfa generating usage charges for a vehicle travelling along a road other than the segment of road to which the usage charge applies:
- characterised in that the method comprises the following steps;
a. Division of the segment of road selected into “
N”
segment sections, with each segment section having an associated closed control area;
b. Characterisation of the length of the N segment sections and the road half-width a, in the N segment sections;
c. Characterisation of the topology of the segments of road outside the N segment sections of road;
d. Characterisation of the GNSS errors inside of and around the N segment sections depending on the level of protection PLi(x) defining a curve of maximum GNSS error margins depending on the probability that a curve of margins is lower than the maximum margin curve;
e. Identification of the probability (pfa)i of detecting a vehicle assuming that these are all equal and the probability (pmd)i of failure to detect a vehicle also assuming that these are all equal and their values can be derived from probabilities pmd and pfa according to a distribution of the binomial type;
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Accused Products
Abstract
The invention relates to a method for determining the position and shape of a control area on a road on which a vehicle is travelling, and to which a usage charge applies. According to the invention, a segment of the road is divided into segment sections and the perimeter of geographical coordinates of the control area associated with each segment section is calculated. At at least two different moments, a GNSS receiver calculates the position of the vehicle, said calculated positions being inside the control area; a control area being provided that is defined by a perimeter of geographical coordinates, fulfilling the requirements in terms of charging availability being above a pre-determined threshold value and the probability of a charging error being below a threshold value.
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Citations
10 Claims
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1. A method for determining the position and shape of closed control areas on a segment of road to which a usage charge is applicable, defining a probability pmd of failure to generate usage charges for a segment user and a probability pfa generating usage charges for a vehicle travelling along a road other than the segment of road to which the usage charge applies:
- characterised in that the method comprises the following steps;
a. Division of the segment of road selected into “
N”
segment sections, with each segment section having an associated closed control area;b. Characterisation of the length of the N segment sections and the road half-width a, in the N segment sections; c. Characterisation of the topology of the segments of road outside the N segment sections of road; d. Characterisation of the GNSS errors inside of and around the N segment sections depending on the level of protection PLi(x) defining a curve of maximum GNSS error margins depending on the probability that a curve of margins is lower than the maximum margin curve; e. Identification of the probability (pfa)i of detecting a vehicle assuming that these are all equal and the probability (pmd)i of failure to detect a vehicle also assuming that these are all equal and their values can be derived from probabilities pmd and pfa according to a distribution of the binomial type; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- characterised in that the method comprises the following steps;
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10. A system for determining the position and shape of closed control areas on a segment of road to which a usage charge is applicable, defining a probability pmd of failure to generate usage charges for a segment user and a probability pfa generating usage charges for a vehicle travelling along a road other than the segment of road to which the usage charge applies;
- characterised in that the system comprises a transaction application server adapted to;
l. Dividing the segment of road selected into “
N”
segment sections, with each segment section having an associated closed control area;m. Characterising the length of the N segment sections and the road half-width ai in the N segment sections; n. Characterising the topology of the segments of road outside the N segment sections of road; o. Characterising the GNSS errors inside of and around the N segment sections depending on the level of protection PLi(x) defining a curve of maximum GNSS error margins depending on the probability that a curve of margins is lower than the maximum margin curve; p. Identifying the probability (pfa)i of detecting a vehicle assuming that these are all equal and the probability (pmd)i of failure to detect a vehicle also assuming that these are all equal and their values can be derived from probabilities pmd and pfa according to a distribution of the binomial type;
- characterised in that the system comprises a transaction application server adapted to;
Specification