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In Rostov started production of the most load-lifting rotary-wing car The Russian holding «Helicopt[...]
CADAC implementation of PN
For five-DoF CADAC implementations the guidance law is programmed in the Cl Guidance Module (see Fig. 9.23) and provided with the necessary input from the Seeker Module S1 (see Fig. 9.30) and the INS Module S4. The two components of the acceleration signal are converted to units in gs and sent as normal acceleration command а^с and lateral acceleration command du to the autopilot (see Autopilot Sec. 9.2.3.1). The third component parallel to the body 1 axis is not used.
The key design parameter is the navigation ratio N. It usually is a constant but could be made a function of the closing speed between target and missile. To determine its value, start with the number three and conduct sensitivity studies
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throughout the engagement envelopes. You will have to compromise and emphasize the more probable intercepts.
We have succeeded in modeling the PN guidance law, but only in its simplest form. The more complex form of thrust-corrected PN is reserved for Sec. 10.2.5.1. Let us now turn to a yet unpublished guidance law, which I have used for waypoint guidance and landing approaches of airplanes.
