[특허]Global Positioning System telecommand link

Global Positioning System telecommand link 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/185
출원번호	US-0765680 (1991-09-26)
발명자 / 주소	Alves Jr. Daniel F. (896 Blake St. Santa Maria CA 93455)
인용정보	피인용 횟수 : 81 인용 특허 : 0

초록 ▼

An improvement to the present system of Global Positioning System of satellites and ground stations, adding the capability of transmitting and receiving telecommand information, when required, to the current Navigation information. Three alternate embodiments are proposed. The first approach utilizes a spread-spectrum transmission of the command message, requiring few added components to the transmitter, and additional despread components to the receiver to extract the telecommand message. The second approach is simpler. Here the telecommand message is transmitted on a single frequency signal which is not modulated by a spreading code. The additional hardware in the receiver is a simple detector and demodulator. The third approach is based on redefining portions of the present GPS Navigation message to include telecommand information bits. No additional transmitter components are required, and only a command demultiplexer is added to the receiver. Advantages of the invention include a great reduction in required power, volume and weight of satellites and unmanned vehicles, as well as greater control and security of command signals.

대표청구항 ▼

An improvement to the present Global Positioning System (GPS) of transmitters and receivers, to incorporate a capability of transmitting and receiving telecommand messages; the improvement comprising: (a) telecommand processing components added to a GPS receiver; said components comprising a correlator, a single code track delay-lock loop, a doppler measure and a BPSK demodulator; said correlator and delay-lock loop being connected to the output of the wide band IF amplifier in said GPS receiver, for performing a despreading function on the received telecommand message; said doppler measure being connected to the clock source of said GPS receiver and having its output carrier reference signal connected input to said correlator; said correlator despreading the received spread-spectrum telecommand message and outputting a digitized, filtered telecommand message to the BPSK demodulator; said BPSK demodulator demodulating the telecommand message for use; and (b) telecommand processing components added to a GPS transmitter; said components comprising a digitizer circuit means, a spreader circuit means, an RF oscillatator and a mixer; said digitizer, digitizing an input telecommand message and presenting a digitized command signal connected to said mixer; said RF oscillator, operating at one of three selected frequencies: L1: 1575.42 MHz, L2: 1227.6 MHz, or L3: 1381.05 MHz; said spreader circuit means being connected and synchronized with the clock in said GPS transmitter and also to said RF oscillator, and presenting a spread-spectrum signal at a selected oscillator frequency to said mixer; said mixer operating on its input digitized telecommand message and spread-spectrum signal to produce a spread-spectrum telecommand message signal for connection to said GPS transmitter circuit wide band amplifier; said amplifier, amplifying said spread spectrum telecommand signal together with its normal input spread GPS NAV information message signal, and transmitting the combined telecommand and GPS NAV signals by antenna.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Global Positioning System telecommand link 원문보기

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Global Positioning System telecommand link 원문보기

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