IMPACT OF THE CHOICE OF FREQUENCY AND MODULATION ON RADIO NAVIGATION SYSTEMS

The choice of frequency for radio navigation is a subject of considerable depth and is inextricably intertwined with requirements for range, accuracy, reliability, cost and impact on competitive services using radiowaves. The basic information for passing judgment on these items comprises the limitations imposed by nature on the system. These limitations are the laws of physics governing the propagation of radio waves. Great ranges and hence large coverage areas can be obtained at opposite ends of the spectrum in the OMEGA and SATELLITE systems. Great accuracy is accomplished with the ground wave propagation mechanism in the form of LORAN-C and LORAN-D. The choice of modulation is critical if high accuracy of position is an objective or requirement. It is concluded that the most important single subject bearing upon the choice of frequency concerns the propagation of the radio waves that the navigation systems utilize. The frequency ranges and other characteristics of present and proposed navigation systems are tabulated. Radio spectrum utilization is also considered.

Media Info

  • Features: References;
  • Pagination: p. 33-38

Subject/Index Terms

Filing Info

  • Accession Number: 00084557
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Proc Paper
  • Files: TRIS
  • Created Date: May 19 1975 12:00AM