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公开(公告)号：EP0079689B1
公开(公告)日：1987-01-14
申请号：EP82305569.4
申请日：1982-10-20
申请人： SPERRY CORPORATION
发明人： Maine, Reuben Edwin
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公开(公告)号：EP0115152A3
公开(公告)日：1985-09-11
申请号：EP83307707
申请日：1983-12-19
申请人： SPERRY CORPORATION
发明人： Maine, Reuben Edwin
摘要： A receiver accurately measures the Doppler shift of a radio signal from a transmitter having a known frequency and moving with respect to the receiver by using the signal from another transmitter of known frequency as a reference. The signals from the two transmitters are received by a single antenna (1), separated, and processed in separate channels. In a typical application using Global Positioning System satellite signals, each signal is discretely extracted by auto-correlation with its own pseudorandum noise signal, filtered, amplified, and applied to second mixers (17, 17') in phase locked loops in the respective channels. The two resulting second IF signals are applied to an output mixer (31) whereupon the resulting difference output signal represents the difference in frequency between the two Doppler signals.
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公开(公告)号：EP0115151A3
公开(公告)日：1985-08-28
申请号：EP83307706
申请日：1983-12-19
申请人： SPERRY CORPORATION
发明人： Maine, Reuben Edwin
摘要： @ A phase differential determining apparatus generates low frequency output signals from a multiple channel receiver and extracts relative phase angles of the receiver RF signals therefrom. The same local oscillator signals, which are phase locked to one of the received RF signals, are utilised for all channels thus preserving the phase difference of the RF signals during the heterodyning process so that phase angle differences between the low frequency output signals is the same as the phase angle differences between the received RF signals. The relative phase angles are determined at the low frequency signals from the local oscillator (27) which is phase locked to a reference channel, and varying the phase shift applied thereto until the phase difference between this low frequency local oscillator signal and the low frequency output signal of the selected channel is zero. The phase shift introduced to the low frequency local oscillator signal is equal to the difference in phase between the two RF signals.
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公开(公告)号：EP0079689A3
公开(公告)日：1983-07-27
申请号：EP82305569
申请日：1982-10-20
申请人： SPERRY CORPORATION
发明人： Maine, Reuben Edwin
摘要： In a Global Positioning System type of navigation system, a biphase modulated radio frequency input signal is applied to the "front end" (11) of a double heterodyne receiver having a second intermediate frequency stage which operates in the audio frequency range. The audio output signal is phase locked to a 1 KHz reference signal and is applied to a microprocessor (24) for processing via an interface circuit which includes a relatively simple amplitude detector (51) and a biphase detector (54). The microprocessor (24) also controls the phase shifting of a pseudorandom noise code generator (70) whose output is modulated with the output of the first intermediate frequency stage of the receiver.
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公开(公告)号：EP0079689A2
公开(公告)日：1983-05-25
申请号：EP82305569.4
申请日：1982-10-20
申请人： SPERRY CORPORATION
发明人： Maine, Reuben Edwin
摘要： In a Global Positioning System type of navigation system, a biphase modulated radio frequency input signal is applied to the "front end" (11) of a double heterodyne receiver having a second intermediate frequency stage which operates in the audio frequency range. The audio output signal is phase locked to a 1 KHz reference signal and is applied to a microprocessor (24) for processing via an interface circuit which includes a relatively simple amplitude detector (51) and a biphase detector (54). The microprocessor (24) also controls the phase shifting of a pseudorandom noise code generator (70) whose output is modulated with the output of the first intermediate frequency stage of the receiver.
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