https://secwww.jhuapl.edu/techdigest/Content/techdigest/pdf/V29-N01/29-01-Palumbo_Principles_Rev2018.pdf JOHNS HOPKINS APL TECHNICAL DIGEST, VOLUME 29, NUMBER 1 (2010)25
INTRODUCTION
The key objective of this article is to provide a broad
conceptual foundation with respect to homing guidance
but with sufficient depth to adequately support the arti-
cles that follow. During guidance analysis, it is typical to
assume that the missile is on a near-collision course with
the target. The implications of this and other assump-
tions are discussed in the first section, Handover Analysis.
The next section, Engagement Kinematics, establishes
a geometric foundation for analysis that is used in the
subsequent sections of this and the other guidance-
related articles in this issue. In particular, a line-of-
sight (LOS) coordinate frame is introduced upon which
the kinematic equations of motion are developed; this
coordinate frame supports the subsequent derivation of
his article provides a conceptual foundation with respect to homing guid -
ance upon which the next several articles are anchored. To this end, a basic
geometric and notational framework is first established. Then, the well-
known and often-used proportional navigation guidance concept is developed. The
mechanization of proportional navigation in guided missiles depends on several factors,
including the types of inertial and target sensors available on board the missile. Within
this context, the line-of-sight reconstruction process (the collection and orchestration of
the inertial and target sensor measurements necessary to support homing guidance) is
discussed. Also, guided missiles typically have no direct control over longitudinal accel -
eration, and they maneuver in the direction specified by the guidance law by producing
acceleration normal to the missile body. Therefore, we discuss a guidance command
preservation technique that addresses this lack of control. The key challenges associ -
ated with designing effective homing guidance systems are discussed, followed by a
cursory discussion of midcourse guidance for completeness’ sake.