EP0154338A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Precipitation loss compensation and disablement for avoidance of satellite transponder overloading
Assignee: NEC Corp
•
Filing: 1985-03-06
•
Granted: —
•
Expires: 2005-03-06
Abstract
Abstract A transmitting power control system is disclosed wherein a master earth station sends a pilot signal to a satellite which retransmits it to the master station as well as to slave earth stations. A beacon signal is also sent from the satellite to the master station which compares it with the received pilot signal and controls its own transmission power level according to the result of the comparison so that the power level of retransmitted pilot signal is maintained constant. A warning signal is sent from the master station to all the slave stations when the received pilot signal decreases below a prescribed value corresponding to a predetermined precipitation. Each slave station receives the pilot signal from the satellite and controls its own transmission power level according to the received pilot signal. A disabling circuit is provided in each slave station to disable the power control function of the own station in response to the warning signal to prevent the satellite from being overloaded by the information signals transmitted from the slave earth stations.
Inventors
- 👤 Satoru Ohno
- 👤 Yasuhisa Shimada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:32
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/38; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1851; H04B7/18513
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
237 words
A transmitting power control system for a satellite communication network, the network comprising a satellite for transmitting a beacon signal and receiving and retransmitting a pilot signal, a master earth station having uplinks and downlinks established through said satellite to the downlinks and uplinks of a plurality of slave earth stations, comprising: said master earth station comprising means for generating a pilot signal to be transmitted to said satellite, means for receiving the pilot signal retransmitted from the satellite, means for receiving said beacon signal, first variable gain amplifier means for providing amplification of uplink information signals and the generated pilot signal, means for comparing the received pilot and beacon signals and controlling the gain of said amplifier means in accordance with the result of the comparison so that the effective isotropically radiated power of the retransmitted pilot signal is maintained constant, and means for generating a warning signal when said pilot signal decreases below a prescribed value corresponding to a predetermined precipitation; and each of said slave earth stations comprising second variable gain amplifier means for providing amplification of an uplink information signal, means for receiving the pilot signal from said satellite, means for controlling the gain of said amplifier means in accordance with the received pilot signal, and means responsive to said warning signal for disabling said controlling means to prevent said satellite from being overloaded by the information signals transmitted from said slave stations.
Claim 2
Dependent Claim
237 words
A transmitting power control system for a satellite communication network, the network comprising a satellite for transmitting a beacon signal and receiving and retransmitting a pilot signal, a master earth station having uplinks and downlinks established through said satellite to the downlinks and uplinks of a plurality of slave earth stations, comprising: said master earth station comprising means for generating a pilot signal to be transmitted to said satellite, means for receiving the pilot signal retransmitted from the satellite, means for receiving said beacon signal, first variable gain amplifier means for providing amplification of uplink information signals and the generated pilot signal, means for comparing the received pilot and beacon signals and controlling the gain of said amplifier means in accordance with the result of the comparison so that the effective isotropically radiated power of the retransmitted pilot signal is maintained constant, and means for generating a warning signal when said pilot signal decreases below a prescribed value corresponding to a predetermined precipitation; and each of said slave earth stations comprising second variable gain amplifier means for providing amplification of an uplink information signal, means for receiving the pilot signal from said satellite, means for controlling the gain of said amplifier means in accordance with the received pilot signal, and means responsive to said warning signal for disabling said controlling means to prevent said satellite from being overloaded by the information signals transmitted from said slave stations.
Claim 3
Dependent Claim
35 words
A transmitting power control system as claimed in claim 1, wherein said warning signal generating means comprises means for disabling said pilot signal generating means when the received pilot signal decreases below said prescribed value.
Claim 4
Dependent Claim
50 words
A transmitting power control system as claimed in claim 2, wherein said warning signal responsive means comprises means for detecting when the received pilot signal is below a prescribed value corresponding to said predetermined precipitation for disabling said controlling means when the received pilot signal decreases below said prescribed value.
Claim 5
Dependent Claim
73 words
A transmitting power control system as claimed in claim 2 or 3, wherein said pilot signal generating means comprises an oscillator and a modulator for modulating a carrier with the output of said oscillator, the output of said modulator being coupled through said first variable gain amplifier means to one of the uplinks of said master earth station, said modulator being responsive to said detecting means to disable the modulation of the carrier.
Claim 6
Dependent Claim
44 words
A transmitting power control system as claimed in claim 3 or 4, wherein said detecting means in said slave earth station comprises a demodulator for demodulating the received pilot signal, the output of said demodulator being coupled to said controlling means to disable same.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.