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Generalized high performance navigation system

A technology of navigation signals and navigation devices, applied in the field of navigation, can solve problems such as lack of vertical

Active Publication Date: 2015-05-20
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, other navigation methods based on cell phone or television signals typically lack vertical navigation information

Method used

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  • Generalized high performance navigation system
  • Generalized high performance navigation system
  • Generalized high performance navigation system

Examples

Experimental program
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Effect test

Embodiment Construction

[0046] According to various embodiments discussed herein, a navigation system using low earth orbit (LEO) satellites may be used to implement various navigation signals to provide high integrity navigation. Passive ranging signals from LEO satellites and other non-LEO transmitters (eg, spaceborne and / or terrestrial) can be integrated into the system.

[0047] A reference network of monitoring stations can estimate clock bias, signal structure, and transmitter location or ephemeris of various platforms from which passive ranging signals are sent. This estimated information (also referred to as calibration information) can be communicated to various navigation devices through a data link utilizing the LEO satellites or other data link.

[0048] Navigation devices can be configured to mix broadcast information with several different types of signals to perform high-accuracy navigation. The broadcasted LEO signals can be implemented with military, commercial and civilian navigati...

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Abstract

Various approaches to localized jamming of navigation signals are provided. In one embodiment, a navigation signal comprises at least a portion of a low earth orbit (LEO) signal provided by a LEO satellite. A noise source is filtered to provide a plurality of filtered noise signals in a plurality of frequency bands. The navigation signal is spread over a plurality of channels of the LEO signal. The channels are distributed over the frequency bands and a plurality of time slots. A pseudo random noise (PRN) sequence is generated. The filtered noise signals are modulated using the PRN sequence to provide a plurality of modulated noise signals. The modulated noise signals are broadcast over an area of operations to provide a plurality of jamming bursts corresponding to the navigation signal. The jamming bursts are configured to substantially mask the navigation signal in the area of operations.

Description

technical field [0001] The present invention relates generally to navigation, and more particularly to satellite-based navigation techniques. Background technique [0002] The performance of a navigation system may be determined by the distribution of errors (eg, accuracy) in navigation measurements provided by the system. System performance may also depend on the system's ability (eg, integrity) to provide timely alerts to users when the system should not be used. Performance can also be measured by how long it takes the navigation system to obtain its first position fix (eg, time to first fix) from a cold start. Additionally, system performance may depend on the fraction of time or specific circumstances (eg, availability) during which specified performance parameters fall within specified limits. [0003] Unfortunately, the navigation signals provided by various existing navigation systems often do not provide satisfactory system performance. Specifically, the signal p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02G01S19/07G01S19/11G01S19/12G01S19/31
CPCG01S19/015G01S19/02G01S19/03G01S19/07G01S19/11G01S19/12G01S19/21G01S19/31G01S19/47H04K3/28H04K3/42H04K3/43H04K3/90
Inventor 克拉克·E·科恩戴维·A·惠伦罗伯特·W·布伦利巴顿·G·费雷尔格雷戈里·M·格特
Owner THE BOEING CO