公开(公告)号：US3470479A

公开(公告)日：1969-09-30

申请号：US3470479D

申请日：1966-01-12

Applicant: MOTOROLA INC

Inventor： JANC ROBERT V

IPC: H04B1/16 ,  H04W88/02 ,  H04B1/06 ,  H04B1/10

CPC classification number: H04W88/027 ,  H04B1/1638

公开(公告)号：CA1165841A

公开(公告)日：1984-04-17

申请号：CA391505

申请日：1981-12-04

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  JANC ROBERT V ,  ROBINS DAVID S ,  RETZER MICHAEL H

IPC: H04B1/10 ,  G01S1/24 ,  G01S5/10 ,  H04B1/12

Abstract: A method and apparatus for attenuating an interfering signal corrupting a desired Loran C signal is provided. An interfering signal sample is determined which occurs at the peak of the autocorrelation function of the interfering signal such that the period of the interferer is known. The sample occurring at the peak of the autocorrelation function is added to or subtracted from the desired Loran C signal sample taken at a predetermined reference point during the pulses thereof such that the interfering signal is cancelled or substantially attenuated.

公开(公告)号：CA1260120A

公开(公告)日：1989-09-26

申请号：CA517172

申请日：1986-08-29

Applicant: MOTOROLA INC

Inventor： JANC ROBERT V ,  JASPER STEVEN C

IPC: G01S1/00 ,  G01S11/10 ,  G01S19/29 ,  G01S19/30 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

Abstract: A digital receiver (100) for GPS C/A-code signals is described. The GPS receiver (100) of the present invention provides reception and tracking a plurality of satellites simultaneously, using four separate receiver channels. The GPS receiver (100) of the present invention includes an analog front-end (104) for selecting and frequency translating the received GPS signal. The GPS receiver (100) further includes a highspeed digital signal processor (110) for recovering the despread data of the GPS signal. The baseband signal is further processed by a genertal purpose digital signal processor (112) for signal search, tracking, and data recovery operations, and a microprocessor (114) provides overall receiver control, and interface with the operator of the GPS receiver (100).

公开(公告)号：CA1318358C

公开(公告)日：1993-05-25

申请号：CA616314

申请日：1992-02-19

Applicant: MOTOROLA INC

Inventor： JANC ROBERT V ,  JASPER STEVEN C ,  LONGLEY LESTER A ,  LAMBERT KATHERINE H ,  TURNEY WILLIAM J ,  LILLIE ROSS J

IPC: H03D1/24 ,  H04B1/10 ,  H04L7/00 ,  H04L23/02

Abstract: DIGITAL RADIO FREQUENCY RECEIVER A digital radio receiver is described. The digital receiver (100) of the present invention contemplates a digital radio receiver which operates on a received analog signal which has been converter to a digital form after preselection at the output of the antenna. The digital receiver (100) of the present invention comprises a preselector (106), a high-speed analog-to-digital (A/D) converter (108), a digitally implemented intermediate-frequency (IF) selectivity section (110) having an output signal at substantially baseband frequencies, and digital signal processor (DSP)circuit (120) performing demodulation and audio filtering. The radio architecture of the present invention is programmably adaptable to virtually every known modulation scheme and is particularly suitable for implementation on integrated circuits.

公开(公告)号：CA1304786C

公开(公告)日：1992-07-07

申请号：CA517169

申请日：1986-08-29

Applicant: MOTOROLA INC

Inventor： JANC ROBERT V ,  JASPER STEVEN C ,  LONGLEY LESTER A ,  LAMBERT KATHERINE H ,  TURNEY WILLIAM J ,  LILLIE ROSS J

IPC: H03H17/02 ,  H03D1/22 ,  H03D3/00 ,  H04B1/26 ,  H04B14/04 ,  H03D1/24 ,  H04L7/00 ,  H04L23/02 ,  H04B1/10

Abstract: DIGITAL RADIO FREQUENCY RECEIVER A digital radio receiver is described. The digital receiver (100) of the present invention contemplates a digital radio receiver which operates on a received analog signal which has been converted to a digital form after preselection at the output of the antenna. The digital receiver (100) of the present invention comprises a preselector (106), a high-speed analog-to-digital (A/D) converter (108), a digitally implemented intermediate-frequency (IF) selectivity section (110) having an output signal at substantially baseband frequencies, and digital signal processor (DSP)circuit (120) performing demodulation and audio filtering. The radio architecture of the present invention is programmably adaptable to virtually every known modulation scheme and is particularly suitable for implementation on integrated circuits.

公开(公告)号：CA1165840A

公开(公告)日：1984-04-17

申请号：CA391489

申请日：1981-12-04

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  JANC ROBERT V ,  ROBINS DAVID S ,  RETZER MICHAEL H

IPC: H04B1/10 ,  C30B29/62 ,  G01R23/02 ,  G01S1/24 ,  G01S5/10 ,  G01R23/00

Abstract: An apparatus and method for determining the period and frequency of a signal interfering with a desired Loran C signal are provided. A sample of the interfering signal is generated at a time corresponding to the peak of the autocorrelation function of the interfering signal with respect to the predetermined pulse tracking reference point of the Loran C signal. Indicia of the period and frequency of the interferer is obtained from the timing of the sample generated at the autocorrelation function peak.