# ÜDVÖZLI ÖNÖKET A Budapesti Műszaki és Gazdaságtudományi Egyetem Általános és Felsőgeodézia Tanszéke.

## Presentation on theme: "ÜDVÖZLI ÖNÖKET A Budapesti Műszaki és Gazdaságtudományi Egyetem Általános és Felsőgeodézia Tanszéke."— Presentation transcript:

ÜDVÖZLI ÖNÖKET A Budapesti Műszaki és Gazdaságtudományi Egyetem Általános és Felsőgeodézia Tanszéke

BUDAPEST

TÉRINFORMATIKAI GPS ALKALMAZÁSOK Dr Graczka Gyula graczka@altgeod.agt.bme.hu

y Y XY Z r R e.ρ R= r - e.ρ

PRECISION AND ACCURACY PRECISION OF GPS ACCURACY OF GPS

ρ = c.τ Δρ = c. Δτ Δρ = 3.10 8 m/s. 10 -12 s Δρ = 0.3 mm PRECISION OF THE GPS SYSTEM

6om Tipical satellite path without S/A 0 11:54 U U= User equivalent range error

SPS USER EQUIVALENT ERROR [m] ACCURACY OF THE GPS SYSTEM SA AS C/A RT MAX YES NO YES NO YES NO 100(150) 40(60) 100(150) 24(36) 300(450) 120(180) 300(450) 40(60)

1oom Tipical satellite path with S/A 0 11:54 U= User equivalent range error U

1min10min 1hour 12hours1day 100 300 Pos. error Obs. time 1m 3m Postioning accuracy vs Observation time

3min 0 PRC RRC RTCM SC 104 Ver 2.0

DGPS Corrections I. C/A code PRC i = ρ’ i -| r - R | i RRC i = PRC i - PRC i-1 ρ i = | r - R | i + PRC i ρ i = ρ i-1 + RRC i-1 RTCM v2.0 True range PRC : Pseudorange correction RRC: Range rate correction r : satellite position R : reference position ρ’ : pseudorange ρ : corrected range BASE REC

DGPS Corrections II. Carrier phase CFC i = Φ ’ i - FRAC( ρ i /(N*λ)) N = INT (ρ i / λ) DFC i = CFC i - CFC i-1 Φ i = Φ ’ i + CFC i Φ i = Φ i -1 + RFC i -1 RTCM v2.1 True phase CFC : Carrier Phase Correction RPC: Rate of Phase Correction N : resolved ambiguity Φ ’ : raw phase ρ : corrected range Φ : correct phase BASE REC

DIFFERENTIAL CORRECTIONS DIFFERENTIAL CORRECTIONS for for REALTIME PRECISE NAVIGATION REALTIME PRECISE NAVIGATION Geostationary satellite Terrestrial radio Wide area coverage Contry to continentalWide area coverage Contry to continental Availabilty in high seas Availabilty in urbanareasAvailabilty in high seas Availabilty in urbanareas Accuracy 5 - 10 m Accuracy submeterAccuracy 5 - 10 m Accuracy submeter Latency  6 sec Latency  0.1 secLatency  6 sec Latency  0.1 sec Low elevation Topographic warmholesLow elevation Topographic warmholes Expensive antenna Inexpensive antennaExpensive antenna Inexpensive antenna Sophisticated receiver Simple pager receiverSophisticated receiver Simple pager receiver

COST ACCURACY 1σ 100m 10m1m10cm1cm 1mm 0.3mm POSITONING COST vs ACCURACY

Demand ACCURACY 1σ 100m 10m1m10cm1cm 1mm 0.3mm POSITONING COST vs ACCURACY DGPSRTKPOSTPROCESSING

75 50 0 19 57 76 Deviation (%) Frequency (KHz)

1999CEI Workshop,Trieste Prof. Dr. GRACZKA Gyula FM BROADCASTING SITES

NAVSAT VEHICLE CONSIGNMENT SENSOR TELECOMTELECOM MAP DISPATCHER ACC. PANIC NET INTELLIGENT TRANSPORT SECURITY SYSTEM

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