CHAPTER 7:  AIDING OPTIONS FOR A GPS RECEIVER

7.1  TYPES OF AIDING

Aiding a GPS receiver is done by incorporating inputs from external sources and is

performed to enhance the following operations:

a. Acquisition of initial satellite signals,

b. Translate the navigation solution to a position in the HV other than the GPS

antenna,

c. Replace a satellite measurement in case of limited visibility or bad satellite

geometry,

d. Maintain satellite tracking by increasing the tolerance of the GPS receiver to

interference, jamming or high HV dynamics.

Figure 7 1 illustrates some options.  It should be noted that these are options and that not

all GPS receivers presently have the capabilities described.

EXAMPLE DISCRETE INTERFACE

MISSION COMPUTER

ARINC 429

CDU

HV CDU

DATA LOADER

RS 422

HV DATA LOADER

GPS

INS/AHRS

ARINC 575

RECEIVER

INS

PTTI

AHRS

ARINC 572

MEMORY

ALTIMETER

DOPPLER

CADC

EXAMPLE MUX BUS

OTHER SYSTEMS

Figure 7 1.  Aiding Options for a GPS Receiver

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