When an aircraft moves under a low
carrier-to-noise ratio (CNR) or at a high speed, increasing the
sensitivity of global navigation satellite system (GNSS) receiver is
a goal quite hard to achieve. A novel acquisition scheme assisted
with micro-electro-mechanical-sensor (MEMS) inertial navigation
system (INS) is presented to estimate the Doppler caused by user
dynamics relative to each satellite ahead of time. Based on tightly
coupled GNSS/INS estimation algorithm, MEMS INS Doppler error that
can be achieved is first described. Then, by analyzing the mean
acquisition time and signal detection probability, the MEMS
INS-assisted acquisition capabilities in cold, warm and hot starts
are quantitatively determined and compared with the standard GNSS
acquisition capability. The simulations and comparisons have shown
that: the acquisition time in cold start can be shortened by at
least 23 s, the time in warm start can be shortened to 1 s and the
acquisition capability is improved 95%, and the reacquisition
time in hot start can be shortened by around 0.090 s and the
capability can be enhanced 40%. The results demonstrate the
validity of the novel method.
YE Ping (叶 萍), ZHAN Xing-qun (战兴群), ZHANG Yan-hua (张炎华)
. Micro-Electro-Mechanical-Sensor Inertial Navigation System-Assisted Global Navigation Satellite System Receiver Acquisition Scheme and Performance
Evaluation[J]. Journal of Shanghai Jiaotong University(Science), 2011
, 16(6)
: 728
-733
.
DOI: 10.1007/s12204-011-1217-1
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