Continuous-wave range measurement apparatus

Details Continuous-wave range measurement apparatus Continuous-wave range measurement apparatus

1977-11-07

1979-07-31

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 65R, G01S 937, G01S 956

Patent

active

041632338

ABSTRACT:
Distance is measured with a tone modulated AM radio system by making a signal at the ranging tone frequency phase coherent with respect to the modulation on the RF signal at the input to the receiver by means of a product detector located ahead of the receiver of the transponder. In this way, a ranging tone phase is established which is a direct and accurate measure of the modulation phase (delayed by the propagation time) and is independent of any modulation phase shifts experienced in the receiver.

REFERENCES:
patent: 3769589 (1973-10-01), Buntschuh et al.
patent: 3790940 (1974-02-01), Becker

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