Features of OFDM signals delay tracking for navigation and radio location

The orthogonal frequency multiplexing as a modulation technique for measuring signals of navigation and location systems is discussed. It is shown that the technique has several advantages in comparison on traditional BOC and BPSK. An OFDM with irregular subcarriers approach is proposed. Relatively to OFDM with uniform subcarriers the approach allows to increase the delay estimation accuracy. An anti-jam capability is increased proportionally to the number of beacons. It is possible to generate the signal with the constant envelope and to process signal components separately.