Method and apparatus for slope creep monitoring

• US 5,950,140 A
• Filed: 07/05/1996
• Issued: 09/07/1999
• Est. Priority Date: 07/05/1996
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Smith, Derek Steve
• Primary Examiner(s): McElheny, Jr., Donald E.
• Application Number:
  US08/675,946
• Time in Patent Office: 1,159 Days
• Field of Search: 364/420, 364/421, 364/422, 702/2, 702/5, 702/14, 702/15
• US Class Current: 702/2
• CPC Class Codes: G01S 19/14 specially adapted for specific applications
• CPC Class Codes: G01S 19/39 the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO

Abstract

According to one embodiment, a slope of a land mass is precisely monitored. Remote sensors are placed in selected positions on the slope. The remote sensors are configured to provide real time position information. A virtual model of the slope is created using positioning information generated by the remote sensors and is stored in a computer memory. The position of each remote sensor is also recorded in the computer memory so that the virtual model accurately reflects the real world situation. A threshold value is set to establish a permissible deviation of each remote sensor location. Real time positioning information produced by the remote sensors is monitored at a base station and is used to update the virtual model. If the position of a remote sensor deviates beyond its associated threshold value, an alarm message is flashed. The information so obtained can also be displayed to a user as a graphical and textual representation of the current state of the slope. Reports can be generated once an alarm message is given.

Claims

1. A method of monitoring a land mass comprising the steps of:

positioning remote sensors in selected positions on a slope of the land mass, the remote sensors configured to provide real time positioning information;

establishing a virtual model of a land mass based on the positioning information from the remote sensors, the virtual model being stored in a memory;

associating digital representations of the positions of the remote sensors with the virtual model in a data structure in the memory;

monitoring the real time location information provided by the remote sensors; and

modifying the remote sensor location within the virtual model so as to generate a real-time virtual model which corresponds to a current location of the remote sensors on the land mass.

2. The method of claim 1 wherein at least one of the remote sensors comprises a GPS sensor, and wherein the step of positioning comprises the steps of:

locating at least one GPS sensor on the slope such that an antenna associated with the GPS sensor is located at a strategic point on the slope so as to provide real-time positioning information concerning the strategic point.

3. The method of claim 1 wherein the remote sensors are coupled to a communication device and wherein the step of monitoring comprises the steps of:

providing the real-time location information produced by the remote sensors to the communication device;

modulating a communication signal with the real-time location information in the communication device and transmitting the communication signal over a communication link to a base station;

receiving the communication signal at the base station and demodulating the communication signal to extract the real-time location information; and

processing the real-time location at the base station to produce update information for the virtual model.

4. The method of claim 3 wherein the step of modifying comprises the steps of:

updating the virtual model using the update information so that the virtual model corresponds to the actual location of the remote sensors.

5. The method of claim 1 further comprising the steps of:

setting a threshold value for a tolerable deviation in position for each remote sensor;

using the real time location information provided by each remote sensor to determine whether the threshold value has been exceeded; and

displaying an alarm message upon a distance deviation of a real time remote sensor from the predefined coordinate system location greater than the threshold value.

6. A precise monitoring apparatus comprising:

a base station;

a remote sensor configured to provide real time positioning information and further configured to communicate with the base station; and

a communication system coupling the remote sensor and the base station, the communication system providing a link for transmitting the real time positioning information between the remote sensor and the base station.

7. The precise monitoring apparatus of claim 6 wherein the remote sensor further comprises:

an internal bus;

a GPS receiver configured to communicate with the internal bus;

the GPS receiver, further configured to generate the real time positioning information;

memory configured to communicate with the internal bus;

a microprocessor configured to communicate with the internal bus, the microprocessor configured to receive the real time positioning information from the GPS receiver and configured to provide the real time positioning information to the communication system for transmission to the base station.

8. The precise monitoring apparatus of claim 6 wherein the base station further comprises:

a system bus;

a memory configured to communicate with the system bus;

a display configured to communicate with the system bus;

a microprocessor configured to communicate with the system bus, the microprocessor configured to receive the real time positioning information from the communication system and configured to generate display information based on the real time positioning information, the microprocessor configured to transmit the display information to the display,

wherein the display information is displayed on the display such that a user is provided with information regarding the position of the remote sensor.

9. A precise monitoring apparatus as in claim 6 wherein the communication system comprises a two-way radio communication system.

10. A precise monitoring apparatus as in claim 6 wherein the communication system comprises an optical communication system.

11. A method of generating a report regarding deviations of a slope, the method comprising the steps of:

positioning remote receivers in selected positions on the slope, the remote receivers configured to provide real-time position information regarding the slope;

monitoring the real-time location information provided by the remote receivers and using the information to create a virtual representation of the slope, the virtual representation being stored in a memory of a computer system;

terminating the monitoring of the information and generating a report regarding the position of the slope using the virtual representation.