Cellular position locating system
First Claim
1. A cellular position locating system for locating the geographical coordinates of a person at a remote location using a portable hand held remote unit and a cellular telephone system comprising:
- receiver means for receiving navigational signals from satellites in orbit about the earth;
signal processing means for demodulating the satellite navigationals signals;
means for generating a pseudo random code;
timing means connected to said signal processing means demodulating means and said signal processing means;
means for generating position information signals by comparing the time difference of the navigational signals and the pseudo random code signals;
means for converting said position information signals into cellular telephone signals;
cellular telephone signal transmitting means;
cellular telephone system for receiving and transmitting said transmitted cellular telephone signals;
base unit means coupled to said cellular telephone system for processing cellular telephone signals received from said cellular transmitter;
said base unit means including means for decoding the received signal for determining geographic location position data; and
a display means connected to said base unit for displaying the geographical coordinate information.
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Accused Products
Abstract
The invention comprises a portable locating unit useful both as a cellular telephone and portable global positioning system that provides latitude and longitude information remotely to a base unit display. The system includes a small hand held receiver that receives signals from a satellite global positioning system and timing and computing circuits to provide location information signals. The hand held unit also includes a modem and transmitter to a cellular telephone network which is connected to the base unit computational system and display. The location of an individual or object can thus be determined at the remote station through the use of the cellular telephone network.
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Citations
4 Claims
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1. A cellular position locating system for locating the geographical coordinates of a person at a remote location using a portable hand held remote unit and a cellular telephone system comprising:
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receiver means for receiving navigational signals from satellites in orbit about the earth; signal processing means for demodulating the satellite navigationals signals; means for generating a pseudo random code; timing means connected to said signal processing means demodulating means and said signal processing means; means for generating position information signals by comparing the time difference of the navigational signals and the pseudo random code signals; means for converting said position information signals into cellular telephone signals; cellular telephone signal transmitting means; cellular telephone system for receiving and transmitting said transmitted cellular telephone signals; base unit means coupled to said cellular telephone system for processing cellular telephone signals received from said cellular transmitter; said base unit means including means for decoding the received signal for determining geographic location position data; and a display means connected to said base unit for displaying the geographical coordinate information.
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2. A method for locating a person or object at a remote location from a base location comprising the steps of:
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(a) receiving navigational information signals from a satellite location at a remote location; (b) generating a pseudo random code at the remote location and comparing it to a known time signal relative to the satellite navigational signals; (c) providing cellular telephone modem signal processing means for transforming the navigational information into a cellular telephone signal; (d) transmitting the cellular telephone signal containing the navigational signal information to a cellular telephone network; (e) receiving the cellular telephone signal containing the navigational signal information through a cellular telephone to a central processing unit; (f) displaying the navigational signal information received at a base unit.
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3. A cellular position locating system to provide latitude and longitude information from a remote site to a base site comprising:
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a portable housing sized to be hand held; portable navigational satellite signal receiving means mounted in said housing; means for generating a pseudo random code mounted in said housing; timing means to provide time of day mounted in said housing; satellite signal and pseudo random code processing means having inputs connected to said navigational satellite signal receiving means, pseudo random code generating means and said timing means to provide an output signal representing the geographical location of said satellite signal receiving means; telephone modem means connected to the output of said satellite signal processing means for converting said geographical location output signal into a cellular telephone signal; cellular telephone signal transmitter connected to said modem and mounted in said housing; cellular telephone signal network for receiving and transmitting cellular telephone signals; and a base unit connected to said cellular telephone signal network for receiving said cellular telephone signals representing said geographical location and for providing a display that represents said geographical location of said navigational satellite signal receiving means. - View Dependent Claims (4)
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Specification