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Signal generator for radio navigation system

  • US 4,642,647 A
  • Filed: 08/29/1983
  • Issued: 02/10/1987
  • Est. Priority Date: 08/29/1983
  • Status: Expired due to Term
First Claim
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1. A multiple code generator for use in a radio navigation system of the type wherein location is determined in accordance with multiple spatially-distributed radio frequency signal fixings, each of said signal fixings comprising a radio frequency signal of preselected coding, said code generator comprising, in combination:

  • a. a read only memory for storing a plurality of bit sequences, each of said sequences comprising a predetermined code of said navigation system;

    b. means coupled to said read only memory for accessing preselected bit sequences;

    c. means for applying a predetermined bit rate and phase shift to said sequences, said means including a counter; and

    d. means for outputting said preselected bit sequences.

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