MIL-M-8555C
3.9.1.7 Jam to signal ratio. The performance of an electronic counter
countermeasures (ECCM) technique shall be specified in terms of how much
jamming to signal (J to S) ratio, expressed in decibels, shall be necessary to
defeat the ECCM.
3.9.1.8 Decision logic. The criteria for determining when the missile
sensor subsystem is in an electronic countermeasures environment shall be
specified. The criteria for determining the type of ECCM to utilize, and for
how long, shall be specified. Included shall be the criteria for switching to
and from home-on-jam mode of operation.
3.9.2 Stabilization subsystem. The stabilization subsystem is the
missile subsystem that controls the flight dynamics of the missile. The type
of stabilization subsystem used shall be specified. A block diagramof the
stabilization subsystem shall include each element, and shall be defined so
that the stabilization subsystem performance can be determined. Stability,
accuracy, margin, time constants, and limits of the stabilization system shall
be specified.
3.9.2.1 Steering. The maximum commands that each channel of the steering
system must be capable of executing shall be specified as a function of
velocity, altitude, missile roll, missile pitch and atmospheric conditions.
Logic modifying the steering commands (for example, the maximum qravity-force
under certain conditions) shall be specified in words and in flow-charts. The
input commands that the steering section shall respond to shall be defined.
Time constants for each steering command shall be specified, along with the
method of measurement and the definition (eg, time required for a Control
surface to travel 90 percent of the angular distance from its initial position
to its final position, given a step input). The accuracy of the damping
factor to which the system must repond shall be specified.
3.9.2.2 Roll. The type and characteristics of the roll system shall be
specified in detail. The maximum value of the controlled variable that can be
induced shall be specified as a function of velocity, altitute, and steering
transients. Input commands to the roll system and system reponse required
shall be defined. Time constants for the roll system shall be defined and
specified.
3.9.2.3 Roll-steering interactions. The three-dimensional stability
characteristics of the system shall be specified as a function of velicity
and altitude. The interactions between the roll system and the steering
system as a function of velocity and altitude shall be specified.
3.9.2.4 Control channels. The control channels to the actuators shall be
described, and their minimum sensitivity and maximum noise level shall be
specified. The minimum accuracy in encoding and decoding the command shall
also be specified. The amount of cross-coupling between each of the channels
shall be specified in such detail as to allow calculation of resultant command
for any set of Possible inputs.
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