The pseudo range correction for certain satellite is split up in separate corrections for ephemeris error, the satellite clock arrow and the ionospheric error.

 

4                   

Each user receives only the pseudo range corrections for the satellites which are visible to user in order to keep the correction message as short as possible.

 

 

Вопрос 321

Signal reception is required from a minimum number of satellites that have adequate elevation and suitable geometry in order for a satellite assisted navigation system (GPS) to carry out independent three dimensional operation without the Receiver Autonomous Integrity Monitoring (RAIM) function. The number of satellites is:

 

 

Ответы

1                   

3

 

2              

4

 

3                   

5

 

4                   

6

 

 

Вопрос 322

How long does it take a GLONASS satellite to orbit the Earth?

 

 

Ответы

1                   

12 hours

 

2              

Hours 15 minutes

 

3                   

24 hours

 

4                   

1 hour 10 minutes

 

 

Вопрос 323

What is the procedure to be followed if, on a flight under IFR conditions using the NAVSTAR GPS satellite navigation system, the number of satellites required to maintain the RAIM (Receiver Autonomous Integrity Monitoring) function are not available?

 

 

Ответы

1                   

The flight may be continued as planned if at least 4 satellites are available and the pilot monitors the GPS manually.

 

2                   

The flight has to be continued under VFR conditions.

 

3                   

A constant heading and speed must be flown until the required number of satellites are again available.

 

4              

The flight may be continued using other certificated navigation systems.

 

Вопрос 324

Which of the following geometric satellite constellations provides the most accurate NAVSTAR GPS position fix?

 

 

Ответы

1                   

4 satellites with an azimuth of 90° from each other and a low elevation above the horizon.

 

2                   

4 satellites with an azimuth of 90° from each other and an elevation of 45° above the horizon.

 

3              

3 satellites with a low elevation above the horizon and an azimuth of 120° from each other together with a fourth directly overhead.

 

4                   

3 satellites with an azimuth of 120° from each other and an elevation of 45° above the horizon.

 

Вопрос 325

How many satellites form the nominal NAVSTAR GPS constellation?

 

 

Ответы

1              

24

 

2                   

12

 

3                   

36

 

4                   

6

 

 

Вопрос 326

The reason why the measured distance between a NAVSTAR GPS satellite navigation system satellite and a

 

receiver is called a pseudo range is because the:

 

 

Ответы

1                   

measured distance is based on the pseudo random noise code.

 

2              

Calculated range includes receiver clock error.

 

3                   

calculated range is based on an idealised Keplerian orbit.

 

4                   

movement of satellite and receiver during the distance calculation is not taken into account.

 

 

Вопрос 327

In the Nav message, the "ephemeris" refers to the exact:

 

 

Ответы

1                   

position and orbit of all the satellites in the constellation.

 

2                   

position and orbit of all the satellites in the same orbit.

 

3                   

the observed satellite clock corrections.

 

4              

Position and orbit of the observed satellite.

 

Вопрос 328

Minimum number of NAVSTAR GPS satellites required to obtain an accurate 3D fix

 

 

Ответы

1                   

6

 

2                   

5

 

3                   

3

 

4              

4

 

 

Вопрос 329

In relation to the NAVSTAR GPS satellite navigation system, what is involved in the differential technique (D-GPS)?

 

 

Ответы

1                   

Receivers from various manufacturers are operated in parallel to reduce the characteristical receiver noise error.

 

2                   

The difference between signals transmitted on the L1 and L2 frequencies are processed by the receiver to determine an error correction.

 

3              

Fixed ground stations compute position errors and transmit correction data to a suitable receiver on the aircraft.

 

4                   

Signals from satellites are received by 2 different antennas which are located a fixed distance apart. This enables a suitable receiver on the aircraft to recognise and correct for multipath errors.

 

 

Вопрос 330

Which statement is correct about GLOSSNASS/NAVSTAR GPS/GALILEO:

 

 

Ответы

1                   

for position fixing they are all based on the WGS84 ellipsoid.

 

2              

They all reach their degree of accuracy in polar areas.

 

3                   

all three system use time measurement to determine position.

 

4                   

they are all using the same frequencies to permit a single receiver to work all three systems.

 

 

Вопрос 331

One of the tasks of the GPS control segment

 

 

Ответы

1                   

to control continuously the motion of GPS-satellites.

 

2                   

to calculate the accuracy of GPS.

 

3                   

to calculate and transmit differential corrections to users.

 

4              

To detect the malfunctioning of satellites.

 

 

Вопрос 332

Which of the following is the datum for altitude information when conducting flights under IFR conditions on

 

airways using the NAVSTAR GPS satellite navigation system?

 

 

Ответы

1              

Barometric altitude.

 

2                   

GPS altitude if 4 or more satellites are received otherwise barometric altitude.

 

3                   

The average of GPS altitude and barometric altitude.

 

4                   

GPS altitude.

 

 

Вопрос 333

The control segment function of GPS NAVSTAR is

 

 

Ответы

1                   

To monitor and ensure that the transmitted signals are saved and processed to utilize WAAS.

 

2