In the mathematical optimization model, the position coordinates of the BSs are the variables, while the average GDOP of each trajectory segment is defined as the objective function.
The average GDOP is a function of the positions of the BSs and MS.
3) Take average of GDOP of each segment as the objective function, the multiple objective optimization model is formed.
3) Although both the proposed algorithm and the method in  adopt the GDOP as a BS placement criterion, they are rather different, because the proposed algorithm is able to cope with any type of trajectory, instead of a particular one.
Some officers alleged that, although the GDOP allocated sufficient budget for gasoline, part of the money went into private use.
Each prison has a Security Classification Committee, chaired by the warden, whose role is to classify prisoners into high, medium or low security categories (1988; GDOP, 2003, Procedure 2).
Prison procedures and the UN Standard Minimum Rules for the Treatment of Prisoners were not strictly adhered to and overcrowding appeared normal (1977; GDOP, 2003).
Esto conduce al concepto de GDOP (dilucion geometrica de la precision) que se define (Sturza, 1983) como
GDOP se puede dividir en las diluciones de precision en posicion y tiempo, PDOP y TDOP respectivamente: