Inter satellite link (ISL) is an effective way for
the global navigation satellite system (GNSS) to reduce its
dependence on ground infrastructure, which guarantees constellation orbit determination and satellite communication. When
the number of onboard Ka-band ISL antennas is less than
that of visible satellites, the inter-satellite link assignment of
GNSS causes a problem. For the problem of inter-satellite link
scheduling, considering that the result of the allocated link
has a feedback effect on the subsequent link assignment as a
priori knowledge, an adaptive topology optimization algorithm
based on signed variance (ABSV) is proposed. In order to meet
the requirements of communication and ranging performance,
the time slot is divided into a communication time slot and
a ranging time slot. Taking the waiting delay time of satellite
communication and PDOP as measurement indexes, the proposed
strategy is simulated for 10080 min. The results show that the
ranging performance of this strategy is better than other recently
published methods, which verifies the effectiveness of signed
variance for adaptive link planning and is also beneficial to the
survivability of constellation.
An Adaptive Topology Optimization Strategy for GNSS Inter-satellite Network
