GPS Question & AnswersJuly 7, 2021 By WatElectronics In 1970, a navigation system based on satellites developed by the U.S DoD (Department of Defense) known as the Global Positioning System. This system is initially developed for the fulfillment of the military needs of the U.S armed forces. Later on, it was made accessible for both civilian and military users.The purpose of GPS is to provide information about time as well as the position of the object and this is a continuous phenomenon. Nowadays unlimited users are accessing this system. It is passive by nature. Obstacles such as mountains and trees block the weak GPS signals so that the accuracy and the performance get affected. GPS can be accessed for free. 1). GNSS systems are _______________.GPSGLONASSGalileoAll the aboveHintGNSS includes GPS, GLONASS, Galileo, and Compass 2). During which year the project on GPS was launched?1970197119721973Hint GPS was introduced in 1973 3). Who are the members involved in the success of GPS invention?Roger L. EastonIvan A. GettingBradford ParkinsonAll the aboveHintMembers involved in the invention of GPS 4). A test on General Relativity was proposed by ____________.Roger L. EastonIvan A. GettingBradford ParkinsonFriedwardt WinterbergHintFriedwardt Winterberg in the year 1955 5). Global Positioning System (GPS) is operated by _______?Russian Space ForceChina Space ForceUnited States Space ForceFrench Air and Space ForceHintGPS is set up by the people in the U.S. 6). A receiver at GPS calculates the self time and position basing on the received data from the different ___________.SatellitesRadio wavesAtomic clocksNone of the aboveHintSatellites carry the exact information record of time and position 7). ___________ is present on the satellites of GPS to contribute the accurate time information.AntennaTransponderAtomic clockAll the aboveHintMultiple atomic clocks present on the satellites 8). How many minimum satellites are operational in the constellation of GPS?24252627Hint24 operational satellites 9). The degradation in the quality of GPS by the government of the U.S. discontinued by whom?Ivan A. GettingBradford ParkinsonFriedwardt WinterbergBill ClintonHintBill Clinton was the president of the U.S. 10). Which country developed GLONASS in contemporary with the GPS?ChinaIndiaNepalRussiaHintRussia suffered from the coverage issues across the globe by mid-2000 11). Galileo system for Navigation is operated by ________.ChinaIndiaEuropeRussiaHintGalileo systems offer higher rates of accuracy 12). Compass satellite system of navigation is operated under __________ government.ChineseIndianEuropeanRussianHintChinese system GPS developed offering wide coverage 13). The GPS operated by Indians is ____________.CompassGLONASSGalileoNavICHintRegional GPS NavIC 14). Once the Selective Availability got lifted the accuracy of GPS was for __________ meters.3456HintProvides an accuracy of about 30 centimetre 15). The mathematical principle involved in GPS is _________?Graphical ResectionAnalytical ResectionTrilaterationTriangulationHintTrilateration is the phenomenon of collecting the signals from the satellites and applying the geometry of spheres, triangles, and circles 16). The services offered by GPS ________?Positioning, Navigation and TimingPollution, Navigation and TemperaturePosition, Navigation and TemperaturePosition, Network and TimingHintPositioning is to determine the location 17). The satellites placed in the constellation of GPS arranged into _______ orbital are surrounded to Earth?FiveSixSevenEightHintEach orbital in the constellation consists of four satellites 18). The term ‘Epoch’ in GPS is a coded sequence of _________.Time of DepartureTime of ClosureTime of Arrival (TOA)None of the aboveHintEncodes the week numbers per each timing message of GPS 19). The two satellites and its extensions connecting line forming the axis of _______.ParabolaHyperboloidEllipseNone of the aboveHintThree hyperboloids are useful in the detection of one intersecting point 20). Based on ___________ a receiver of GPS indicates how far the satellite located is.Time DifferenceTime of ArrivalTime of DepartureBoth b & cHintGPS compares the timing when a signal is transmitted through satellite and the timing the signal is received 21). The satellites meant for GPS orbits in _______________.Low Earth Orbit (LEO)Medium Earth Orbit (MEO)Geosynchronous Orbit (GSO)Geostationary Equatorial Orbit (GEO)HintSatellite takes in MEO 22). How many satellites on the surface of Earth are used so that the location can be produced?ThreeFourFiveSixHintThree are required to produce the location 23). A device altitude can be measured using __________ satellite.FirstSecondThirdFourthHintFourth satellite is useful in gathering the information 24). How many satellites are required to measure 2-D position i.e., the longitude and the latitude?OneTwoThreeFourHintMinimum of three satellite signals are required 25). The components partitioned in GPS are known as ______.SegmentsFramesPartitionsPacketsHintThree sub-parts known as segmentsGPS Interview Questions & Answers 26). The current GPS consists of ______ major segments.TwoThreeFourFiveHintSegments are utilized for gathering information 27). The segments present in GPS are __________.SpaceGround controlUser equipmentAll the aboveHintSpace includes satellites, Ground control possesses the stations to monitor and the user equipment 28). The US Space Forces maintains, develops and operates _______ segments.Space and UserControl and UserSpace and ControlSpace and UserHintSpace and the control segments are operated by U.S forces 29). The space segment consists of _________ number of satellites.16 to 3224 to 3216 to 2424 to 48HintOperational satellites 30). How many ground antennas are present in the control segment?ThreeFourFiveSixHintGround antenna's purpose is to track and monitor distinct satellites 31). _____________ tracks the satellites as they are passed over.Master Control StationsMonitor stationsGround AntennasNone of the aboveHintMonitoring stations are the part of control segment 32). The observations collected by the monitor stations are fed to ________.Master Control StationsMonitor stationsGround AntennasNone of the aboveHintMaster Control station provides control and command 33). Global monitoring station is used in _____________.Master Control StationsMonitor stationsGround AntennasNone of the aboveHint Global monitoring stations are preferred in master control stations 34). An alternate Master Control station is present in ________.Space segmentControl segmentUser segmentBoth a & cHintAlternate master control station is present in the control segment 35). How many AFSCN’s are present in the ground antennas category?FiveSixSevenEightHintAFSCNs is the remote stations 36). AFSCN stands for _______.Air Force Satellite Control NetworkAir Force Satellite Communication for NavigationAir Force Social Communication NetworkNone of the aboveHintAFSCNs installed with GPS helps in tracking 37).Telemetry is collected by ________.Master Control StationsMonitor stationsGround AntennasNone of the aboveHintGPS combined with telemetry is useful for collecting the data 38). How many types of observable are present in GPS?OneTwoThreeFourHintObservable is the term used in the literature of GPS 39). How many methods used by the surveyors in the measurement of GPS?OneTwoThreeFourHintComprises of three methods 40). ______________ method is used in finding the exact coordinates for the surveying points.Static GPS BaselineReal-Time Kinematic ObservationsContinuously Operating Reference StationsAll the aboveHintObservations of GPS are recorded over time and the data 41). Static GPS Baseline technique makes use of ________ receivers of GPS.OneTwoThreeFourHintTwo receivers are placed from one horizon to the other 42). The distance between base station and the second receiver is calculated by using ________ technique.Static GPS BaselineReal-Time Kinematic Observations (RTK)Continuously Operating Reference StationsAll the aboveHint RTK observations consist of a base station that is static 43). ___________ technique uses the multiple numbers of points during the period of measurement and used as the surveyed data.Static GPS BaselineContinuously Operating Reference StationReal-Time Kinematic (RTK) ObservationsNone of the aboveHintRover station is in the movement to record data of multiple points 44). RTK observations technique limited to ____________ (Kms) range.10203040HintCollection of data simultaneously at the base station as well as the Rover station 45). For the smaller areas ________ technique is used in gathering the surveying data quickly.Static GPS BaselineReal-Time Kinematic (RTK) ObservationsContinuously Operating Reference StationsAll the aboveHintRTK observation technique requires real-time monitoring 46). CORS stands for ______________.Continuously Operating Reference StationConnection-Oriented Reference StationContinuously Operating Reference SwitchingNone of the aboveHintContinuously Operating Reference Station (CORS) 47). ________ technique offers installation of a base station in the location known and that is permanent.Static GPS BaselineReal-Time Kinematic (RTK) ObservationsContinuously Operating Reference StationsAll the aboveHintInstalled base station allows the measurements from any locality 48). The Engineering projects which require surveying continuously over a longer duration prefer which technique?Static GPS BaselineReal-Time Kinematic (RTK) ObservationsContinuously Operating Reference StationsAll the aboveHintCORS technique is used in longer monitoring projects 49). The benefits of using GPS in surveying are ___________.FlexibilityMobilitySpeedAll the aboveHintCommercial companies choose to survey with GPS 50). In _____________ the constellation of GPS expanded from 24-slots to 27.May 2011June 2011July 2011August 2011HintExpansion of 27-slots GPS Question & Answers 51). A group formed with four of the satellites is known as __________.ConstellationSegmentFrameEpochHintEach constellation on its adjacent side is separated by 60 degrees 52). The orbital period for every satellite is on average about ___________ hours.12131424HintThe satellites revolve every two times around the planet Earth 53). The codes used in GPS are ________.Coarse Acquisition codePrecise codeBoth a & bNone of the aboveHintTwo different codes used in the GPS 54). The satellite transmitting signals are modulated with _____________ bit sequences.Pseudo random CodePrecise CodeCoarse Acquisition CodeY CodeHintDistinct pseudorandom sequences 55). The L1 signal modulated by _________ Mbps Pseudorandom sequence.1.0121.0221.0211.023HintCoarse Acquisition code 56). The L2 signal modulated by ___________Mbps sequence of pseudorandom.10.2310.2410.2510.26HintPrecise code 57). Which GPS code is utilized by public?Pseudo random CodePrecise CodeCoarse Acquisition CodeY CodeHintCoarse Acquisition code is less accurate 58). Which code is preferred in Military applications?Pseudo random CodePrecise CodeCoarse Acquisition CodeHamming CodeHint Y-code 59). The services offered by GPS are _________.Precise Positioning Service (PPS)Standard Positioning Service (SPS)Both a and bNone of the aboveHintTo keep track of the received coded signals 60). Which receivers keep track of both the GPS codes?Precise Positioning Service (PPS)Standard Positioning Service (SPS)Both a and bNone of the aboveHintThe encrypted code generated by the precise code 61). Which receivers track only Coarse Acquisition codes?Precise Positioning Service (PPS)Standard Positioning Service (SPS)Both a and bNone of the aboveHintThe receivers of SPS keeps track only of the L1 signals 62). Satellites are provided with a unique sequence of binary code known as _________.Pseudo random CodePrecise CodeCoarse Acquisition CodeGold CodeHintGold codes 63). Which antennas are used in the receivers of GPS?PatchQuad helixBoth a & bModularHintBased on minimizing the interference and the field requirements antennas are selected 64). ____________ antennas are known for amplifying the signals before transmitting it to GPS receiver.ActivePassiveBoth a & bNone of the aboveHintActive antennas is to compensate for the signal losses 65). Less power is utilized by GPS because of _______ antennas.ActivePassiveBoth a & bNone of the aboveHintCable length is limited in the passive antennas 66). A message of navigation broadcasted on L1and the L2 frequencies at ___________ bit rate.50 bits/sec40 bits/sec30 bits/sec10 bits/secHintTime taken by the message to complete is 750 sec 67). The basic message format consists of ________ bits.1000125015001750HintThe message format is in the form of frames 68). Each frame consists of ______ sub frames.3456HintEach sub-frame consists of 300 bits 69). Week number and the timings are encoded in _____ sub frame.FirstSecondThirdFourthHintThe satellite's health is encoded in the first subframe 70). What does second & third sub frame consists of?Week numberTimingsAlmanacEphemerisHintThe precise or the required orbit for the satellite information 71). What information do the fourth and the fifth sub frames hold?Week numberTimingsAlmanacEphemerisHint Information about status, data about error correction of 32 satellites is present in Almanac 72). The time taken by the Almanac to update is _________.24 hrs36 hrs48 hrs72 hrsHintInformation of the satellites, Timing correction, and the delay parameters 73). GPS is accurate within ___________ meters.4567HintPositioning of the satellites 74). DOP stands for __________.Dilution of PerformanceDedication over PrecisionDilution of PrecisionNone of the AboveHintDegradation in the position accuracy of GPS 75). If the satellites used in tracking are evenly spread then the accuracy of position gets _________.DecreasedIncreasedBalancedUnbalancedHintAccuracy values depend upon the positioning of the satellites GPS Quiz Questions 76). If the strength of the signal is high the reception of signal status is __________.StableUnstableUpgradedDegradedHintThe strength of signals and system stability are directly proportional 77). Location caching done in detection of GPS increases ________ of the system.AccuracyFlexibilitySpeedCapacityHintThe previous memorized location can help in determining quickly which satellites are made available for the next duration 78). _________ is the lock of GPS in which previous info used to calculate the newer position.Hot startWarm startCold startSemi startHintSatellites viewed, the last position calculated, and the Almanac 79). Which is the quickest lock of GPS?Semi startWarm startCold startHot startHintIt works only when the device remains in the same position 80). Which lock doesn’t keep the satellites viewing information?Semi startWarm startCold startHot startHintHot and warm starts is the satellites viewing information 81). The lock in which all the information dumped is______.Semi startWarm startCold startHot startHintFirstly satellites are located then the lock of GPS is calculated 82). Which is the longest lock?Semi startWarm startCold startHot startHintCold start is the longest lock among the three locks 83). The principle of Doppler shift used in GPS to measure ________.AccuracyFlexibilitySpeedCapacityHintSpeed between the satellite and the receiver 84). What are the sources of errors in GPS?Signal Multi pathOrbital errorsShadingAll the aboveHintFactors affect the signals of GPS and degrade the accuracy 85). What is GPS-ICD-200?Only satellites informationOnly user informationInterfacing information of user and satellitesNone of the aboveHintInterfacing information 86). ICD is an acronym for _______.Interface Control DocumentInter Communication DilutionInter Control DocumentInternational Classification of DiseaseHintICD holds the technical info about user and satellite interfacing 87). ____________ category GPS receivers are used in the vehicles to achieve address to address information of navigation to the drivers.Recreation GradeMap GradeSurvey GradeBoth a & bHintIdentify the remaining distance required to reach the destination 88). _______________ category receivers offer the users accuracy in position.Recreation GradeMap GradeSurvey GradeBoth a & bHintType of receiver selected 89). __________ type receiver requires ‘Post Processing Software’.Recreation GradeMap GradeSurvey GradeBoth a & bHintReceivers require ‘GPS Data Administration Services’ 90). __________ tells the receiver at what time the satellite should be at what place?HyperboloidEllipseEphemerisDOPHintEphemeris indicates the predicted and the current location of the satellites 91). The accuracy of DGPS is ____cm.10203040HintStatic base station and the dynamic Rover station 92). DGPS stands for _________.Differential Global Positioning SystemDifferential Global Positioning SurveyDigital Global Partitioning SystemDifferential Global Partitioning SystemHintAny two receivers that are kept close to each other will have similar errors 93). Modified version of GPS used to approach precision in the military applications is known as ____________.GPSCGPSPGPSDGPSHintDGPS consists of a receiver set up at a known location in a precise manner 94). In the year 2021 by January 9th how many satellites were operational?28293031HintSatellites that are made operational is to increase the coverage capacity 95). In mapmaking the presence of GPS is to verify _________.TownsRoadsBoundariesNone of the aboveHintMapmakers and surveyors 96). Which country has the accurate GPS in comparison to all the regional GPS launched?U.SIndiaChinaRussiaHintTwo frequencies are used in the U.S system that is pinged between the receiver and the satellites. 97). The handset with the integration of GPS was launched in _________.1990s1980s1970s1960sHintEnhancing security applications 98). Cell phones with the receivers of GPS will communicate with ______________ GPS satellites.30332422HintUsage of GPS in cell phones is dependent on the type of phone used 99). LPS stands for__________.Land Positioning SystemLocal Positioning SystemLimited Purchasing SchemeNone of the AboveHintTo determine the location of the unavailable satellite connections 100). In LPS to determine the location, signals are collected from __________.Cell towersTownsRoadsBoundariesHintGPS is not preferred for indoor uses Read More About Wireless Communication Technologies Time is Up!