Avionics News August 2023 - 47

Artistic rendition of a
GPS Block III satellite.
automobiles and aircraft. With smartphones as examples,
we know the GPS receiver can be tiny. The small size of
GPS allows for a variety of configurations on aircraft. The
GPS can stand alone, be included as part of a nav/comm,
FMS, and even as part of an air data heading reference
system, or ADHRS.
For approach procedures and for ADS-B, the GPS
alone is not accurate enough. There are two types of
augmentation systems used in aviation to increase the
accuracy of the system. In both systems, a receiver on
the ground at a known, surveyed location monitors the
difference between the GPS navigation solution and the
receiver's actual location. Information about the difference
is then broadcast to the user.
capable of receiving all three frequencies are expected to
have accuracy specifications of less than 1 meter without
augmentation.
The control segment includes multiple tracking and
monitoring stations throughout the world. The master
control station is located at Schriever Space Force Base
in Colorado. An alternate master control is located at
Vandenberg Space Force Base in California.
All readers of this magazine are in the user segment
and are familiar with seeing GPS in phones, cameras,
The space-based augmentation system is known as
the wide area augmentation system. WAAS consists of
38 reference stations, three master stations, six uplink
stations, and three geostationary satellites. The correction
signals come into the user's GPS on the L1 frequency.
WAAS improves accuracy enough for category one type
approaches with decision heights as low as 200 feet.
For high-precision approaches, a ground-based
augmentation system is necessary. GBAS uses the local
area augmentation system. LAAS uses several reference
stations located around an airport. These reference
stations send correction information to a VHF data
broadcast transmitter located on or near the airport. The
VDB transmits correction data to the aircraft on the VHF
navigation band. The VDB frequencies are located in
Continued on following page
Examples of good and poor geometric dilution of precision.
avionics news * august 2023 47
Courtesy of Avionics: Beyond the AET
Courtesy of GPS.gov

http://www.GPS.gov

Avionics News August 2023

Table of Contents for the Digital Edition of Avionics News August 2023

Avionics News August 2023 - Intro
Avionics News August 2023 - Cover1
Avionics News August 2023 - Cover2
Avionics News August 2023 - 1
Avionics News August 2023 - 2
Avionics News August 2023 - 3
Avionics News August 2023 - 4
Avionics News August 2023 - 5
Avionics News August 2023 - 6
Avionics News August 2023 - 7
Avionics News August 2023 - 8
Avionics News August 2023 - 9
Avionics News August 2023 - 10
Avionics News August 2023 - 11
Avionics News August 2023 - 12
Avionics News August 2023 - 13
Avionics News August 2023 - 14
Avionics News August 2023 - 15
Avionics News August 2023 - 16
Avionics News August 2023 - 17
Avionics News August 2023 - 18
Avionics News August 2023 - 19
Avionics News August 2023 - 20
Avionics News August 2023 - 21
Avionics News August 2023 - 22
Avionics News August 2023 - 23
Avionics News August 2023 - 24
Avionics News August 2023 - 25
Avionics News August 2023 - 26
Avionics News August 2023 - 27
Avionics News August 2023 - 28
Avionics News August 2023 - 29
Avionics News August 2023 - 30
Avionics News August 2023 - 31
Avionics News August 2023 - 32
Avionics News August 2023 - 33
Avionics News August 2023 - 34
Avionics News August 2023 - 35
Avionics News August 2023 - 36
Avionics News August 2023 - 37
Avionics News August 2023 - 38
Avionics News August 2023 - 39
Avionics News August 2023 - 40
Avionics News August 2023 - 41
Avionics News August 2023 - 42
Avionics News August 2023 - 43
Avionics News August 2023 - 44
Avionics News August 2023 - 45
Avionics News August 2023 - 46
Avionics News August 2023 - 47
Avionics News August 2023 - 48
Avionics News August 2023 - 49
Avionics News August 2023 - 50
Avionics News August 2023 - 51
Avionics News August 2023 - 52
Avionics News August 2023 - 53
Avionics News August 2023 - 54
Avionics News August 2023 - 55
Avionics News August 2023 - 56
Avionics News August 2023 - 57
Avionics News August 2023 - 58
Avionics News August 2023 - 59
Avionics News August 2023 - 60
Avionics News August 2023 - 61
Avionics News August 2023 - 62
Avionics News August 2023 - 63
Avionics News August 2023 - 64
Avionics News August 2023 - Cover3
Avionics News August 2023 - Cover4
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