DGPS is based on the concept that bias errors in the position of locations in a given local area, are same if their distances are within___________________?

Related Mcqs:

1. Which one of the following parameters is accurate for DGPS ?

   A. Positional accuracies ~ 1 – 2 m if rover is less than 1-2 km from the reference station
   B. Positional accuracies ~ 2 – 5m if rover is less than 2-5 fm from the reference station
   C. Positional accuracies ~ 5 – 10 m if rover is less than 5-10 km from reference station
   D. Positional accuracies ~ 5 – 10 m if rover is less than 25 km

2. A and B are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?

   A. Height displacement of A will be less than that of B
   B. Height displacement of B will be less than that of A
   C. Height displacement of A and B is equal
   D. Height displacement of A and B will be towards each other

3. Which one of the following errors is produced by platform characteristics of the sensor ?

   A. Altitude variation
   B. Altitude
   C. Orbit drift
   D. All of these

4. Which one of the following geometric errors of satellite sensors is random ?

   A. Scan skew
   B. Panoramic distortion
   C. Earth rotation
   D. Altitude variation

5. The code based GPS receivers are generally used for_________________?

   A. Vehicle tracking
   B. Land navigation
   C. Trans movement
   D. All of these

6. Geodimeter is based on_________________?

   A. Propagation of modulated light waves
   B. Propagation of infrared radiation
   C. The visible light as carrier with frequency of the order of 5 × 1014 Hz
   D. High frequency radio waves

7. If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by___________________?

   A. Cm = 1/
   B. Cm
   C. Cm
   D. None of these

8. In case of reflection and refraction of electromagnetic radiation ?

   A. Angle of incidence = angle of refraction
   B. Angle of incidence = angle of reflection
   C. Angle of refraction = sum of the angles of incidence and refraction
   D. All the above

9. Which one of the following quantities forms the basis of radiometry ?

   A. Radiant energy (Q)
   B. Radiant flux (Φe )
   C. Radiant intensity (I)
   D. All of these

10. The most widely used antenna in GPS is_______________?

    A. Parabolic antenna
    B. Microstrip antenna
    C. Horn antenna
    D. Slotted antenna