FIS_SMP1: Fuzzy Inference System 2 (FIS2)

In ngort01/fuzzyMM: Map Matching Using Fuzzy Logic

Description

Fuzzy Inference System used in the Subsequent Map Matching Process along a link (SMP-1).

Format

frbs object

Details

SMP-1 checks if the vehicle has already crossed a junction or is about to cross one and matches subsequent positions to the link identified by the IMP if that is not the case. Here you can see the input variables, fuzzy subsets and fuzzy rules used in FIS2. It is usefull to know the variables and how they affect the rule outputs in case you plan to change the range of the fuzzy subsets.

Input variables to this FIS are:

• speed of the vehicle, v (m/s)

• horizontal dilution of precision (HDOP)

• Δ d (m), the difference between the distance from the last matched position to the downstream junction and the distance travelled by the vehicle since the last position fix

• heading increment, HI (degrees)

• α and β (degrees), location of the current position fix, relative to the link, seen from the last matched position and from the downstream junction respectively

The fuzzy subsets of the input variables are:

• high, low, zero

• good, bad

• positiv, negativ

• small, large, 180

• below90, above90

The corresponding fuzzy rules used in this FIS are:

• If (α is below 90 ) and (β is below 90 degrees) then ( L2 is high)

• If (Δ d is positive) and (α is above 90 degrees) then ( L2 is low)

• If (Δ d is positive) and (β is above 90 degrees) then ( L2 is low)

• If (HI is small) and (α is below 90 degrees) and (β is below 90 degrees) then (L2 is high)

• If (HI is small) and (Δd is positive) and (α is above 90 degrees) then (L2 is low)

• If (HI is small) and (Δd is positive) and (β is above 90 degrees) then (L2 is low)

• If (HI is large) and (α is below 90 degrees) and (β is below 90 degrees) then (L2 is low)

• If (HDOP is good) and (v is zero) then (L2 is high)

• If (HDOP is good) and (Δd is negative) then (L2 is average)

• If (HDOP is good) and (Δd is positive) then (L2 is low)

• If (v is high) and (HI is small) then (L2 is average)

• If (HDOP is good) and (v is high) and (HI is 180 degrees) then (L2 is high)

See Also

get_var_bounds, set_var_bounds

Examples

fis_smp1 <- get_fis("SMP1")
fis_smp1
# Plot membership functions
plotMF(fis_smp1)

ngort01/fuzzyMM documentation built on May 23, 2019, 4:43 p.m.