Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1990-01-18
1992-06-02
Kuntz, Curtis
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455254, H04B 116
Patent
active
051195089
ABSTRACT:
In a communication system having a time base for system synchronization, there is provided a method and apparatus for controlling the sensitivity of a receiver comprising the steps of (a) receiving a signal that was predeterminally transmitted by another relative to the time base (wherein signal reception is confirmed when the amplitude of the received signal exceeds a pre-established threshold), (b) determining signal transit time from the time difference between the instant of signal reception relative to the time base and the instant of signal transmission relative to the time base, (c) controlling the sensitivity of the receiver as a function of the transit time by: (1) increasing the gain of the receiver from a minimum sensitivity at the predetermined transmission instant to a maximum sensitivity at maximum range (maximum expected transit time) and (2) nominally maintaining the receiver's gain at the level prevailing at the instant the signal is received.
REFERENCES:
patent: 4619002 (1986-10-01), Thro
patent: 4691377 (1987-09-01), Yoshihara et al.
patent: 4696052 (1987-09-01), Breeden
patent: 4827511 (1989-05-01), Masuto
Section 4.2, Dynamic Range Problems--STC and IAGC, from "Radar Design Principles", by F. E. Nathanson.
Section 14--14 at p. 376 from "Microwave Receivers", Rad. Lab. 1948.
Kuntz Curtis
Motorola Inc.
Motsinger F. John
Sarli Anthony J.
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