Interference Benefits of a Vector Delay Lock
Loop (VDLL) GPS Receiver
May 2007
Don Benson, The MITRE Corporation
ABSTRACT
The interference benefits of a vector delay lock loop
(VDLL) GPS receiver are compared by simulation over
those of a conventional receiver as a first step before
hardware implementation. Besides improvement to
interference performance, other benefits to the user
include: no additional hardware, no increase in power
requirements, no increase in weight, and no decrease in
reliability. In addition simulation results show a VDLL
receiver can implement different filter bandwidths to
accommodate differences that may be expected in vertical
and horizontal motions. A conventional receiver can not
do this. VDLL can be implemented as part of an ultratightly
coupled or a deeply integrated GPS receiver so
that if the inertial system degrades or fails, the receiver
has the interference benefits of VDLL.
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