In this paper, we present the design considerations of an embedded signal processor for application in integrated radio navigation. The navigation receiver consists of four different subsystems: GPS, OMEGA, LORAN-C and MLS. Due to the complementary features of these subsystems, the combined receiver shows improved performance compared to the individual subsystems. We show how such a multi-function receiver can be built around a single high performance application-specific processor, which consists of both general-purpose and application-specific functional units. The processor customization into these functional units is accomplished through algorithm timing analysis using the MOVE processor development framework. A Loran-C baseband processor design is presented as a case-study. We present a new time-distributed FIR filter algorithm which reduces the computational complexity and hardware cost of the Loran-C subsystem.