Personal digital location assistant including a memory cartridge, a GPS smart antenna and a personal computing device

• US 5,528,248 A
• Filed: 08/19/1994
• Issued: 06/18/1996
• Est. Priority Date: 08/19/1994
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Steiner, Glenn C., Trask, Matthew M., Banta, Lloyd H.
• Primary Examiner(s): Issing, Gregory C.
• Application Number:
  US08/293,048
• Time in Patent Office: 669 Days
• Field of Search: 342/357, 342/385, 342/386, 364/705.05, 364/705.01, 364/231-231.31
• US Class Current: 342/357.31
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence
• CPC Class Codes: G01S 19/35 Constructional details or hardware or software details of the signal processing chain
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles

Abstract

A Personal Digital Location Apparatus for displaying a geographical location as an icon on a map. The apparatus includes a GPS Smart Antenna for determining the geographical location, a personal computing device including a display, a processing system including a standard software operating system such as DOS, Windows, Macintosh, or Geoworks, and a map application program capable of running in the operating system. The GPS Smart Antenna includes an internal battery and a power sensor for sensing the connection of an external power source. The GPS Smart Antenna receives power from the external power source when the power sensor senses that the external power source is connected and receives power from the internal battery when the power sensor senses that the external power source is not connected. An input select switch controlled by a Request to Send signal from the personal computing device enables the GPS Smart Antenna to use a single UART chip for receiving a command/control signal from the personal computing device and a differential GPS (DGPS) signal from a DGPS radiowave receiver.

Claims

1. A Personal Digital Location Assistant comprising:

processing means, including a standard software operating system and an application program for processing global positioning system (GPS) location information according to said application program and providing navigation information based upon said application program, and including means for issuing a mode control signal and a command control signal; and

a GPS Smart Antenna including input select switch means coupled to a DGPS radiowave receiver for receiving a DGPS signal including DGPS error corrections and coupled to the processing means for receiving said command control signal, said input select means for selecting one of said DGPS signal and said command control signal according to said mode control signal;

wherein the GPS Smart Antenna includes means for receiving GPS satellite signals from one or more GPS Satellites where each GPS satellite issues a distinct GPS satellite signal, and for providing said GPS location information.

2. The Personal Digital Location Assistant in claim 1, wherein:

the processing means includes said operating system including one of (i) DOS, (ii) Windows, (iii) Macintosh, and (iv) Geoworks.

3. The Personal Digital Location Assistant in claim 1, further including:

a memory cartridge, coupled to the processing means, for storing map information for processing by said application program, including a PCMCIA card built according to a PCMCIA standard having;

a length of about 85.6 mm by a width of about 54 mm, 68 electrical pin and socket connections arranged in 2 rows of 34 each row of about 1.27 mm on center, 8 or 16 data electrical connections for data, up to 26 electrical lines for addresses, electrical lines authorized for power, ground, enable, protect, ready/busy, and interrupt request, and a thickness of one of about 3.3 mm and about 5 mm.

4. The Personal Digital Location Assistant in claim 1, further including:

a memory cartridge, coupled to the processing means, for storing map information for processing by said application program, including a PCMCIA card built according to a PCMCIA standard having;

a length of about 85.6 mm by a width of about 54 mm, 68 electrical pin and socket connections arranged in 2 rows of 34 each row of about 1.27 mm on center, 8 or 16 data electrical connections for data, up to 26 electrical lines for addresses, electrical lines authorized for power, ground, enable, protect, ready/busy, and interrupt request; and

having a thickness of about 10 mm.

5. The Personal Digital Location Assistant in claim 1, wherein:

the GPS Smart Antenna includes a GPS antenna for receiving said GPS satellite signals and for issuing a responsive GPS antenna output signal;

a GPS frequency downconverter connected to the GPS antenna for receiving said GPS antenna output signal and issuing a conducted GPS signal at a selected lower frequency;

a GPS processor connected to the GPS frequency downconverter for receiving said GPS signal at said lower frequency and issuing a data signal including said location data to the processing system means;

an internal battery;

an external power connector; and

a GPS power supply, including a power sensor for sensing when an external power source is connected to said external power connector, for receiving source power from said internal battery when said power sensor senses that said external power source is not connected, for receiving said source power from said external power source when said power sensor senses that said external power source is connected, and for supplying said source power for operating at least one of said GPS antenna, said GPS frequency downconverter, and said GPS processor.

6. The Personal Digital Location Assistant in claim 1, further including:

a memory storage means, coupled to the processing means, for storing map data representative of a geographical location of a map feature and a representation of an attribute of said map feature; and

a display, coupled to the processing means, for receiving a display signal including map information including said map feature and said attribute when said geographical location of said map feature is proximate to said geographical location of the GPS Smart Antenna and displaying said map information in a graphical form visually perceptible by a human user; and

wherein the PDA processing system means further includes said application program for selecting said map feature when said geographical location of said map feature is proximate to said geographical location of said GPS Smart Antenna and for providing said display signal.

7. The Personal Digital Location Assistant in claim 6, wherein:

said memory storage means includes said map feature drawn from the class of topographic features consisting of elevations, land areas, and water areas.

8. The Personal Digital Location Assistant in claim 6, wherein:

said memory storage means includes said map feature drawn from the class of transportation aids consisting of road maps marine charts, aviation charts, trail maps, walking path maps, and bicycling maps.

9. The Personal Digital Location Assistant in claim 6, wherein:

said memory storage means includes said map feature drawn from the class of utility lines consisting of electrical lines, water lines, and gas lines.

10. The Personal Digital Location Assistant in claim 6, wherein:

said memory storage means includes said map feature drawn from the class of boundary maps consisting of property ownership boundaries, jurisdictions of government organizations, and building zoning.

11. The Personal Digital Location Assistant in claim 6, wherein:

said said memory storage means includes said map feature drawn from the class of natural science zones consisting of animal life, vegetation, mineral deposits, and soil types.

12. The Personal Digital Location Assistant in claim 6, wherein:

said said memory storage means includes said map feature drawn from the class of safety zones consisting of hazardous wastes, fire dangers, marine hazards, and military zones.

13. The Personal Digital Location Assistant in claim 1, wherein:

the processing means includes said application program where said application program includes program code written in C language.

14. The Personal Digital Location Assistant in claim 6, wherein:

said memory storage means includes said map feature including an airport including said attribute of at least one of (i) an alphanumeric identifier, (ii) a runway length, (iii) a signal frequency, (iv) an inner control ring, and (v) an outer control ring.

15. The Personal Digital Location Assistant in claim 1, wherein:

said mode control signal is Request to Send (RTS).