Signal modulation methods and apparatus

Details Signal modulation methods and apparatus Signal modulation methods and apparatus

1989-11-17

1995-07-18

Cain, David C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Utilizing correlation techniques

342382, G01S 316

Patent

active

054345774

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.

REFERENCES:
patent: 4060809 (1977-11-01), Baghdady
patent: 4088955 (1978-05-01), Baghdady
patent: 4106023 (1978-08-01), Baghdady
patent: 4203133 (1980-05-01), Baghdady
patent: 4298872 (1981-11-01), Rodgers
patent: 4313116 (1982-01-01), Powell et al.
patent: 4495502 (1985-01-01), Masak

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