Question 1

Selective availability describes which of the following?&#10;A)Incorrect data deliberately transmitted from GPS satellites&#10;B)Why GPS does not function underground&#10;C)&#34;Dead zones&#34; where GPS cannot function at all&#10;D)Using a U.S.Coast Guard Beacon to get a better position determination

Accepted Answer

Selective availability refers to the intentional degradation of GPS signal by the US government. This was done to ensure that the military had an advantage over civilians in terms of accuracy. In May 2000, this degradation was turned off, making GPS accessible to all with a high degree of accuracy.

Question 2

Ephemeris error can result in what level of error in GPS accuracy?&#10;A)About 2 meters&#10;B)About a few centimeters&#10;C)About 100 meters&#10;D)About 5 millimeters

Accepted Answer

A

Question 3

Which of the following statements is correct concerning GPS signals and codes?&#10;A)The C/A and P codes are both transmitted on both L1 and L2.&#10;B)The C/A code is transmitted on L1 and the P code is transmitted on L2.&#10;C)The C/A code is transmitted on L1 and the P code is transmitted on L1 and L2.&#10;D)The C/A code is transmitted on L1 and L2 while the P code is transmitted on L2.

Accepted Answer

The C/A (Coarse/Acquisition) code is transmitted on the L1 frequency, and the P (Precise) code is transmitted on both L1 and L2 frequencies. This allows for dual-frequency GPS receivers to correct for ionospheric delay, improving accuracy.

Question 4

When the GPS signals bounce off objects to arrive later than anticipated,which of the following types of errors is occurring?&#10;A)Almanac&#10;B)PDOP&#10;C)Multipath&#10;D)Tropospheric

Accepted Answer

This type of error is called "multipath error," which occurs when GPS signals bounce off objects before reaching the receiver. This can cause the receiver to calculate an incorrect position.

Question 5

The Russian equivalent of GPS is&#10;A)Comrade.&#10;B)Glonass.&#10;C)Rodina.&#10;D)Compass.

Accepted Answer

Glonass is a Russian satellite navigation system that functions similarly to GPS. It was developed by the Russian Aerospace Defense Forces and is used for both civilian and military purposes. A and C are not related to satellite navigation systems, and D refers to a type of navigational instrument rather than a specific system.

Question 6

Explain why a minimum of three satellites is necessary to determine a receiver's position using GPS.Also,describe why a fourth satellite is used in position determination.

Accepted Answer

The answer of Explain why a minimum of three satellites...

Question 7

When the correct satellite position is not being sent,what type of error is being encounted?&#10;A)PDOP&#10;B)Selective availability&#10;C)Multipath&#10;D)Ephemeris

Accepted Answer

The correct satellite position is contained in the satellite's ephemeris data, which is sent to the receiver as part of the broadcast message. If the receiver is not receiving or interpreting this data correctly, it may result in errors in the calculated position.

Question 8

The Master Control station for the U.S.GPS is located in&#10;A)Hawaii.&#10;B)Colorado.&#10;C)Washington,D.c.&#10;D)South Dakota.

Accepted Answer

The Master Control station for the U.S. GPS (Global Positioning System) is located at Schriever Air Force Base in Colorado.

Question 9

Which of the following receivers can pick up the military P-code?&#10;A)Dual frequency&#10;B)Single frequency&#10;C)Covert frequency&#10;D)Biaxial frequency

Accepted Answer

Only a dual frequency receiver can pick up the military P-code, which requires both L1 and L2 frequencies. Single frequency receivers can only pick up the civilian C/A code. Covert and biaxial frequencies are irrelevant to this question.

Question 10

EGNOS is the European equivalent of&#10;A)GPS.&#10;B)WAAS.&#10;C)PDOP.&#10;D)Compass.

Accepted Answer

EGNOS is the European Geostationary Navigation Overlay Service, which is the European augmentation system for GPS. It is used to enhance the accuracy and reliability of GPS signals in Europe. WAAS (Wide Area Augmentation System) is the American augmentation system for GPS, serving a similar purpose in North America. PDOP (Position Dilution of Precision) is a measure of the geometric quality of a GPS satellite constellation, and compass is a magnetic navigation tool.

Question 11

High-tech &#34;treasure hunting&#34; that is assisted with GPS is referred to as&#10;A)geofencing.&#10;B)geocaching.&#10;C)geosearching.&#10;D)geostationing.

Accepted Answer

The answer of High-tech &#34;treasure hunting&#34; that is assisted with...

Question 12

The U.S.GPS is called&#10;A)NAVSTAR.&#10;B)GNSS.&#10;C)Galileo.&#10;D)Transit.

Accepted Answer

The answer of The U.S.GPS is called&#10;A)NAVSTAR.&#10;B)GNSS.&#10;C)Galileo.&#10;D)Transit....

Question 13

The distance between a receiver and one satellite is referred to as&#10;A)the almanac.&#10;B)the pseudorange.&#10;C)one-way ranging.&#10;D)the ephemeris.

Accepted Answer

The answer of The distance between a receiver and one...

Question 14

The use of a base station or other Earth-bound source to transmit a correction signal to a GPS receiver refers to&#10;A)CORS.&#10;B)DGPS.&#10;C)WAAS.&#10;D)MSAS.

Accepted Answer

The answer of The use of a base station or...

Question 15

Describe the basic operation of an SBAS in increasing the accuracy of GPS.

Accepted Answer

The answer of Describe the basic operation of an SBAS...

Question 16

The datum used by GPS is&#10;A)NAD27.&#10;B)NAD83.&#10;C)WGS84.&#10;D)NADCON.

Accepted Answer

The answer of The datum used by GPS is&#10;A)NAD27.&#10;B)NAD83.&#10;C)WGS84.&#10;D)NADCON....

Question 17

The European equivalent of GPS is&#10;A)Merlin.&#10;B)Galileo.&#10;C)Copernicus.&#10;D)Timation.

Accepted Answer

The answer of The European equivalent of GPS is&#10;A)Merlin.&#10;B)Galileo.&#10;C)Copernicus.&#10;D)Timation....

Question 18

Use of WAAS can reduce position error to within&#10;A)30 meters.&#10;B)15 meters.&#10;C)3 meters.&#10;D)1 meter.

Accepted Answer

The answer of Use of WAAS can reduce position error...

Question 19

The encrypted version of the P code is the&#10;A)C/A code.&#10;B)Y code.&#10;C)X code.&#10;D)E code.

Accepted Answer

The answer of The encrypted version of the P code...

Question 20

Which of the following systems is designed to operate in Japan?&#10;A)Gagan&#10;B)Beidou&#10;C)IRNSS&#10;D)QZSS

Accepted Answer

The answer of Which of the following systems is designed...

Deck 4: Finding Your Location With the Global Positioning System