module 3 geodetic positioning

1.

1 point

what is the difference between precise rapid orbits and precise final ephemeris?

the latency is different, rapid orbits is calculated within 17 hours while precise final thats approximately 13 days to calculate.

the updates vary between the two rapid gets updates daily while final gets updates weekly.

I don't know

2.

1 point

a source of error in BROADCAST ephemeris r

gravitational pull of the sun and moon

3.

1 point

Which of theses things are characteristics of Rinex files

The final output is position, speed or other related physical quantities.

The calculations are based on a series of measurements from 1 or more satellite constellations.

Is an ASCII format which is able to store Pseudo range and Carrier Phase, & doppler system measurements for GPS, Glonass and GNSS

The ASCII format has 3 types of files Observation file, Navigation file and Meterological file

Observation files can be stationary or kinematic

4.

1 point

The following messages can appear in differential phase rtcm 2.1

GPS partial correction set fixed

RTK uncorrected carrier phase

RTK uncorrected pseudo range phase

5.

1 point

NGS relative calibration- all antenna and phase centre variables are computed with respect to AOAD/M antenna. only 1 type exist ANTINFO(ITRF 1997 or NAD 2002 EPOCH)

True

False

6.

1 point

NGS absolute calibration calculated is mainly intended for IGS analysis centres by combining absolute antenna calibration with BLKIIAz offsets.
it has 2 types
IGS ANTEX format and
NGS ANTINFO

True

False

7.

1 point

RTCM characteristics are

is an international organization that has formulated data and message format and user interface for GNSS and DGNSS.

Data message and format contain the message elements that make up the corrections , the status messages , station parameters and ancillary data

it's in binary format

has 2 current versions 3.1 RTK & 2.0 DGPS or 2.3 RTK (old version)

8.

1 point

a choke ring antenna provides what advantages

highest geodetic position in GNSS

there notable for there ability for rejecting multipath singals

9.

1 point

what is transmitted by precise ephemeris ?

current and exact location.

relative location and orbits as well as the health of the satellite.

10.

1 point

NMEA allow to interface between various peices of marine electronic equipment it allows GNSS receivers to communicate w/ marine equipment such as a echo sounder.

True

False

11.

1 point

from the rinex navigation file what type of data was recorded gps glonass?

2.10 N: GPS NAV DATA RINEX VERSION / TYPE
teqc 2010Oct21 WCDA Operator 20120202 00:12:53UTCPGM / RUN BY / DATE
15 LEAP SECONDS
Solaris x86 5.10|AMD64|cc SC5.8 -xarch=amd64|=+|=+ COMMENT
1.2107D-08 -7.4506D-09 -5.9605D-08 5.9605D-08 ION ALPHA
1.1469D+05 -1.3107D+05 -2.6214D+05 7.2090D+05 ION BETA
-9.313225746155D-10-4.440892098501D-15 405504 1673 DELTA-UTC: A0,A1,T,W
END OF HEADER

gps and glonass

glonass nav data only

gps nav data only

12.

1 point

these messages appear for differential code and beacon rctm 2.0

differential GPS corrections (fixed)

delta differential GPS corrections (fixed)

gps reference station parameters (fixed)

GPS partial correction set (fixed)

13.

1 point

RTCM uses binary format

true it uses binary format

false it uses ASCII like rinex

14.

1 point

Precise ephemeris has 2 advantages what are they

better accuracy when paired with broadcast ephemeris

better repeatability when paired with broadcast ephemeris

15.

1 point

which the following information below tell me the L1 and L2 phase center as well as any offset for the phase center in height , easting and northing

2.11 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE
teqc 2010Oct21 WCDA Operator 20120202 00:13:08UTCPGM / RUN BY / DATE
Solaris x86 5.10|AMD64|cc SC5.8 -xarch=amd64|=+|=+ COMMENT
teqc 2010Oct21 WCDA Operator 20120202 00:12:53UTCCOMMENT
BIT 2 OF LLI FLAGS DATA COLLECTED UNDER A/S CONDITION COMMENT
Stainless steel-pipe pedestal monument COMMENT
CONTACT gps@pgc.nrcan.gc.ca FOR ADDITIONAL INFORMATION COMMENT
SNR is mapped to RINEX snr flag value [0-9] COMMENT
L1 & L2: min(max(int(snr_dBHz/6), 0), 9) COMMENT
teqc windowed: start @ 2012 Feb 1 00:00:00.000 COMMENT
teqc windowed: end @ 2012 Feb 1 23:59:30.000 COMMENT
chwk WCDA-ACP 987020 Chilliwack BC Canada MARKER NAME
40142M001 MARKER NUMBER
PGC-WCDA GEOL. SURV. CANADA OBSERVER / AGENCY
4641123492 TRIMBLE NETRS 1.3-0 REC # / TYPE / VERS
0220365587 TRM29659.00 SCIS ANT # / TYPE
-2215259.7300 -3543996.8300 4802098.7700 APPROX POSITION XYZ
0.0000 0.0000 0.0000 ANTENNA: DELTA H/E/N
L1 0.0000 0.0000 0.0644 ANTENNA: PHASE CENTER
L2 0.0000 0.0000 0.0640 ANTENNA: PHASE CENTER
1 1 WAVELENGTH FACT L1/2
8 C1 C2 P1 P2 L1 L2 S1 S2 # / TYPES OF OBSERV
teqc windowed: start @ 2012 Feb 1 00:00:00.000 COMMENT
teqc windowed: end @ 2012 Feb 1 23:59:30.000 COMMENT
2012 2 1 0 0 0.0000000 GPS TIME OF FIRST OBS
END OF HEADER

L1 PHASE CENTRE 0.0644, L2 PHASE CENTRE 0.0640, NO OFFSET FOR THE PHASE CENTRE

L1 PHASE CENTER 0.0640, L2 PHASE CENTRE 0.0644 PHASE CENTRE OFF SET 0.5M IN THE HEIGHT

16.

1 point

NMEA stands for

National Marine Electronics Association

17.

1 point

__________ is an ASCII RINEX format which consists of satellite ephermis inforamtion of all satellites recorded in the Observation file.

Meteorological file

Navigation File

Observation file

18.

1 point

Intermixing different antenna types..
what is ARP

the surface where L1 and L2 phase centre offsets are reference to

automatic relative positioning

american relative positioning

19.

1 point

what is the accuracy , latency of broadcast ephemeris?

accuracy 200 cm, Latency in Real Time

accuracy <5cm latency in 3hrs

accuracy 10 cm, Latency in real time

accuracy <5cm latency 17 hrs

20.

1 point

____________ is an ASCII rinex format that contains station id, coordinates, receiver type and and GNSS observation data.

Observation file

Navigation file

Meteorological file

21.

1 point

how many types of code was observed in this example of a rinex file

2.11 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE
teqc 2010Oct21 WCDA Operator 20120202 00:13:08UTCPGM / RUN BY / DATE
Solaris x86 5.10|AMD64|cc SC5.8 -xarch=amd64|=+|=+ COMMENT
teqc 2010Oct21 WCDA Operator 20120202 00:12:53UTCCOMMENT
BIT 2 OF LLI FLAGS DATA COLLECTED UNDER A/S CONDITION COMMENT
Stainless steel-pipe pedestal monument COMMENT
CONTACT gps@pgc.nrcan.gc.ca FOR ADDITIONAL INFORMATION COMMENT
SNR is mapped to RINEX snr flag value [0-9] COMMENT
L1 & L2: min(max(int(snr_dBHz/6), 0), 9) COMMENT
teqc windowed: start @ 2012 Feb 1 00:00:00.000 COMMENT
teqc windowed: end @ 2012 Feb 1 23:59:30.000 COMMENT
chwk WCDA-ACP 987020 Chilliwack BC Canada MARKER NAME
40142M001 MARKER NUMBER
PGC-WCDA GEOL. SURV. CANADA OBSERVER / AGENCY
4641123492 TRIMBLE NETRS 1.3-0 REC # / TYPE / VERS
0220365587 TRM29659.00 SCIS ANT # / TYPE
-2215259.7300 -3543996.8300 4802098.7700 APPROX POSITION XYZ
0.0000 0.0000 0.0000 ANTENNA: DELTA H/E/N
L1 0.0000 0.0000 0.0644 ANTENNA: PHASE CENTER
L2 0.0000 0.0000 0.0640 ANTENNA: PHASE CENTER
1 1 WAVELENGTH FACT L1/2
8 C1 C2 P1 P2 L1 L2 S1 S2 # / TYPES OF OBSERV
teqc windowed: start @ 2012 Feb 1 00:00:00.000 COMMENT
teqc windowed: end @ 2012 Feb 1 23:59:30.000 COMMENT
2012 2 1 0 0 0.0000000 GPS TIME OF FIRST OBS
END OF HEADER

4, 2 p codes, 2 codes

8 total (2 c codes, 2 p codes L1, L2, S1 ,S2)

8 total( 2 codes , 2 pcodes L1, L2 ,L5, S2)

22.

1 point

what is the prescise ultra rapid PREDICTED half ephemeris accuracy, speed, latency and how often does it update

10 cm, every 0.1 nano seconds,REAL TIME, 4 times a day it updates

23.

1 point

in an antenna file the phase centre labeled in a gps system is ?
what is the phase centre labeled for GLONASS?

G-GPS R-GLONASS

U-GPS GRS-GLONASS

24.

1 point

this is known as a Receiver Independent exchange Format file. It is data interchange format for raw satellite navigation system data.It allows user to post process the receiver data to get more accurate results usually with other data unknown to the reciever such as better models and atmosphere conditions @ the time of observations.

Rinex

Broad Cast Ephermis

Intermixing different GPS antenna types

25.

1 point

The following messages are sent by NMEA

GGA - GPS FIX DATA

GGL - GEO POS IN LAT & LONG

GNS -GNNS FIX DATA

VTG- COURSE OVER GROUND & GROUND SPEED

ZDA-TIME AND DATE

GSV- GPS SATELLITEWS IN VIEW

GSA- GPS DOP AND ACTIVE STATUS

GGK- REAL TIME POS W/DOP

GGL- REALTIME POSITION WITH COORDINATE QUALITY

26.

1 point

RTCM 2.3 is known as RTCM 10402.3
RTCM 3.1 is known as RTCM 10403.1
both of these versions above are standards developed by the special community .
RTCm 10410.0 is standard for networked transport of RTCM via internet protocol (HINT check the RTCM fact page in module 2)

True

False

27.

1 point

RTCM stands 4?

radio transmission commission for martime

radio technical commission for martime

28.

1 point

__________ is a rinex ascii file format which has information about the weather and other meteorological data of the station over the observation window

Observation FIle

Weather File

Meteorological FIle

Navigation file

29.

1 point

FROM THE FOLLOWING INFORMATION TELL ME THE TYPE OF ANTENNA THAT WAS USED IN THE OBSERVATION FILE
2.11 OBSERVATION DATA G (GPS) RINEX VERSION / TYPE
teqc 2010Oct21 WCDA Operator 20120202 00:13:08UTCPGM / RUN BY / DATE
Solaris x86 5.10|AMD64|cc SC5.8 -xarch=amd64|=+|=+ COMMENT
teqc 2010Oct21 WCDA Operator 20120202 00:12:53UTCCOMMENT
BIT 2 OF LLI FLAGS DATA COLLECTED UNDER A/S CONDITION COMMENT
Stainless steel-pipe pedestal monument COMMENT
CONTACT gps@pgc.nrcan.gc.ca FOR ADDITIONAL INFORMATION COMMENT
SNR is mapped to RINEX snr flag value [0-9] COMMENT
L1 & L2: min(max(int(snr_dBHz/6), 0), 9) COMMENT
teqc windowed: start @ 2012 Feb 1 00:00:00.000 COMMENT
teqc windowed: end @ 2012 Feb 1 23:59:30.000 COMMENT
chwk WCDA-ACP 987020 Chilliwack BC Canada MARKER NAME
40142M001 MARKER NUMBER
PGC-WCDA GEOL. SURV. CANADA OBSERVER / AGENCY
4641123492 TRIMBLE NETRS 1.3-0 REC # / TYPE / VERS
0220365587 TRM29659.00 SCIS ANT # / TYPE
-2215259.7300 -3543996.8300 4802098.7700 APPROX POSITION XYZ
0.0000 0.0000 0.0000 ANTENNA: DELTA H/E/N
L1 0.0000 0.0000 0.0644 ANTENNA: PHASE CENTER
L2 0.0000 0.0000 0.0640 ANTENNA: PHASE CENTER
1 1 WAVELENGTH FACT L1/2
8 C1 C2 P1 P2 L1 L2 S1 S2 # / TYPES OF OBSERV
teqc windowed: start @ 2012 Feb 1 00:00:00.000 COMMENT
teqc windowed: end @ 2012 Feb 1 23:59:30.000 COMMENT
2012 2 1 0 0 0.0000000 GPS TIME OF FIRST OBS
END OF HEADER

TRM29659.00

TRIMBLE NETRS

Leica 860.00

30.

1 point

Antenna calibration files are available in 2 file formats absolute and relative

True

False

31.

1 point

NMEA's has 2 versions, NMEA 2000 which is 50's faster than the other version (NMEA0183 )

True

False

32.

1 point

RTCM 2.2/2.3 has the following messages

rtk uncorrected pseudorange

rtk carrier phase corrections (tentative/fixed )

RTK/High accuracy Pseudo range correction (tentative/fixed)

33.

1 point

what is the prescise ultra rapid observed half ephemeris accuracy, speed, latency and how often does it update

<5 cm, every 0.1 nano seconds, 3 hrs latency, 4 times a day it updates

34.

1 point

what is the precise ephermis (ultra rapid predicted half) accuracy latency and how often does it update

10 cm accuracy, latency in real time, gets updated 4 times aday

accuracy 2000cm, latency real time, doesn't update

35.

1 point

theses RCTM messages are part of Differential cod RTCM

differential GPS corrections (fixed)

delta differential GPS corrections (fixed)

gps reference station parameters (fixed)

36.

1 point

for post processing which Precise ephemeris should be used

precise ephemeris rapid orbits and final

broadcast ephemeris and rinex

rtk and rinex

37.

1 point

THERE ARE 5 MAJOR CONCEPTS OF HIGH PRECISION COVERED IN MODULE 3 FOR GEODETIC POSITIONING 2 THEY R?

Rinex

Intermixing different GPS antenna types

RTCM

NMEA

Precise Ephermis