[특허]MSK phase acquisition and tracking method

MSK phase acquisition and tracking method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03D-003/00 H04L-027/14
출원번호	US-0098590 (1993-07-28)
발명자 / 주소	Mui Shou Y. (Cherry Hill NJ)
출원인 / 주소	Martin Marietta Corporation (Camden NJ 02)
인용정보	피인용 횟수 : 32 인용 특허 : 0

초록 ▼

An MSK receiver includes a downconverter for downconverting the received MSK signals. The phase drift or phase error per bit of the message preamble is determined. The reference carriers are generated, and the phase of the reference signals is adjusted during message demodulation under the control of the estimated rate of phase change across the preamble portion. In accordance with another aspect of the invention, the downconverted MSK signal burst is digitized and the digitized burst signal is stored in memory, following which it is read repeatedly so that bit timing, start-of-message timing, carrier phase, and carrier drift processing may be performed in a desired sequence, using all the available information for more accurate demodulation. According to a yet further aspect of the invention, a second order tracking loop is used to adjust the phase of the demodulation reference signals.

대표청구항 ▼

A method for demodulating a downconverted carrier signal MSK-modulated with a recurrent sequence of digital data words, each of which sequences is accompanied by a preamble, said preamble including a sequence of mutually identical bit/word sync words and a sequence of words together constituting message sync, where each of said words includes a plurality of bits, and said bits of said bit/word sync words are selected for low autocorrelation, said method comprising the steps of: converting said downconverted carrier signal into digital form at a sample rate which produces at least two samples per bit, to form received digital signals; storing in memory said received digital signals representing at least one of said sequences and its accompanying preamble to form stored received signals; reading from memory for a first time at least said bit/word sync words and said message sync words of said stored received signals to produce first-read received signals; correlating said first-read received signals with stored information relating to said preamble to produce information relating to bit and word timing; reading from memory for a second time at least one of said sequences of bit/word sync words and said sequences of message sync words of said stored received signals, to produce second-read signals; correlating said second-read signals with stored information relating to said preamble using said bit and word timing information to start said correlation, to produce information relating to the timing of said sequences of message sync words; determining the timing of said preamble from said information relating to the timing of said sequences of message sync words and the known durations of other portions of said preamble; reading from memory for a third time at least a portion of said preamble from said stored received signals, to produce third-read signals; correlating said third-read signals with stored information relating to MSK symbol characteristics, to thereby produce symbol correlations; storing said symbol correlations in memory to produce stored symbol correlations; reading from memory for a first time at least some of said stored symbol correlations to produce first-read symbol correlations; determining the phase of said first-read symbol correlations in each word, taking the difference in phase between a particular bit of each word and the corresponding particular bit of the following word to produce one-word phase differences, averaging said one-word phase differences over at least a portion of said preamble to produce an estimated phase change per word, and dividing said estimated phase change per word by the number of bits per word to produce estimated phase change per bit; reading from memory for a second time at least some of said stored symbol correlations to produce second-read symbol correlations; using said second-read symbol correlations and said estimated phase change per bit to produce an estimate of the carrier phase of the first bit of said sequence of digital data words; and using said estimate of the carder phase of the first bit of said sequence of digital data words and said estimated phase change per bit to aid said demodulator carrier phase to progress during demodulation of said sequence of digital data words.

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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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MSK phase acquisition and tracking method 원문보기

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