04797677 is referenced by 103 patents and cites 14 patents.

The invention permits a user to derive his pseudo range from earth-orbiting, signal-transmitting satellites without knowledge of the code sequence of modulation carried by the signal, if any. A modulated radio frequency signal having a component at a given frequency, which is transmitted from a satellite is intercepted at a user position. The component is recovered from the intercepted signal. The phase and frequency of the component are measured. From these measurements and similar measurements from other such satellites, the pseudo range of the satellite can be derived. Specifically, a fractional phase is derived from the measured phase and frequency of the intercepted signal. A Doppler range value is also derived from the measured frequencies of the satellites. The Doppler range value is divided by the wavelength of the given frequency to produce an integer and a remainder. The integer is added to the fractional phase to produce a value proportional to the pseudo range.

Title
Method and apparatus for deriving pseudo range from earth-orbiting satellites
Application Number
437819
Publication Number
4797677
Application Date
May 19, 1986
Publication Date
January 10, 1989
Inventor
Donovan J Spitzmesser
La Crescenta
CA, US
Peter F MacDoran
Pasadena
CA, US
Agent
Christie Parker & Hale
Assignee
Istac Incorporated
CA, US
IPC
H04B 7/185
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