Signal modulation methods and apparatus
First Claim
1. A method of eliminating a first selected frequency modulation component of a first signal wave carrying at least first and second frequency modulation components, comprising the steps of:
- Channeling said first signal wave through two receiver branches, designated Branch A and Branch B;
Constituting said Branch A to pass said first signal wave with said first and second frequency modulation components;
Constituting said Branch B to convert said first signal wave to a second signal wave that carries as frequency modulation only one of said first or second frequency modulation components of said first signal wave;
Multiplying outputs of said Branches A and B in a multiplier/mixer means to provide an output with an instantaneous frequency difference component; and
Selecting from the output of said multiplying a frequency component that carries the instantaneous frequency difference component.
0 Assignments
0 Petitions
Accused Products
Abstract
The disclosure relates to methods and apparatus for facilitating the accurate measurement of Doppler frequency shift induced on a one-way-propagated signal wave either by deliberate on-platform controlled actual or simulated motion of a receiving antenna means, or by relative motion between transmitting and receiving platforms, or by both. The methods and apparatus of this invention are directed to the suppression of identifiable components of a composite modulation process on a sinusoidal carrier, for the purpose of retaining, for separate detection, measurement or transmission, the result of any of the aforementioned frequency-shift inducing processes.
16 Citations
10 Claims
-
1. A method of eliminating a first selected frequency modulation component of a first signal wave carrying at least first and second frequency modulation components, comprising the steps of:
-
Channeling said first signal wave through two receiver branches, designated Branch A and Branch B; Constituting said Branch A to pass said first signal wave with said first and second frequency modulation components; Constituting said Branch B to convert said first signal wave to a second signal wave that carries as frequency modulation only one of said first or second frequency modulation components of said first signal wave; Multiplying outputs of said Branches A and B in a multiplier/mixer means to provide an output with an instantaneous frequency difference component; and Selecting from the output of said multiplying a frequency component that carries the instantaneous frequency difference component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification