Determination of state vector, timing, and navigation quality metrics from reception of ADS-B transmissions
First Claim
1. A method of determining the position of a mobile device, comprising:
- receiving at the mobile device a plurality of Automatic Dependent Surveillance-Broadcast (ADS-B) messages from a respective plurality of mobile reference devices, each of the ADS-B messages being broadcast beginning at one of a plurality of ADS-B message start opportunity (MSO) times having known timings relative to a reference time, wherein each of the ADS-B messages contains position information for the mobile reference device transmitting the message and a MSO value indicating the MSO time at which transmission of the message started;
determining a time of reception of each of the ADS-B messages received at the mobile device;
using the MSO value to determine the time of transmission of each of the ADS-B messages received at the mobile device; and
determining a position of the mobile device via multi-lateration based on the time of transmission and the time of reception of the ADS-B messages and the position information for the mobile reference devices.
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Accused Products
Abstract
A technique for determining the position of a mobile device includes receiving messages from respective mobile reference devices. Each of the messages is broadcast beginning at one of several predetermined message start opportunity (MSO) times that have known timings relative to a reference time. Each of the messages contains a MSO value identifying the MSO time at which transmission of the message started. The MSO value is used to determine the time of transmission of each of the messages received at the mobile device, and the position of the mobile device is determined via multi-lateration. According to another approach, the mobile device receives a set of ADS-B messages from a respective set of mobile reference devices. The time of transmission of each of the ADS-B messages is supplied in the ADS-B message itself or in a subsequent message and used to determine the position of the mobile device.
20 Citations
20 Claims
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1. A method of determining the position of a mobile device, comprising:
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receiving at the mobile device a plurality of Automatic Dependent Surveillance-Broadcast (ADS-B) messages from a respective plurality of mobile reference devices, each of the ADS-B messages being broadcast beginning at one of a plurality of ADS-B message start opportunity (MSO) times having known timings relative to a reference time, wherein each of the ADS-B messages contains position information for the mobile reference device transmitting the message and a MSO value indicating the MSO time at which transmission of the message started; determining a time of reception of each of the ADS-B messages received at the mobile device; using the MSO value to determine the time of transmission of each of the ADS-B messages received at the mobile device; and determining a position of the mobile device via multi-lateration based on the time of transmission and the time of reception of the ADS-B messages and the position information for the mobile reference devices. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus, comprising:
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a mobile platform at which a plurality of Automatic Dependent Surveillance-Broadcast (ADS-B) messages is received from a respective plurality of mobile reference devices, each of the ADS-B messages being broadcast beginning at one of a plurality of message start opportunity (MSO) times having known timings relative to a reference time, wherein each of the ADS-B messages contains position information for the mobile reference device transmitting the ADS-B message and a MSO value indicating the MSO time at which transmission of the ADS-B message started; and a processor disposed on the mobile platform and configured to; determine a time of transmission of each of the ADS-B messages received at the mobile platform, the time of transmission being determined from the MSO value; and determine a position of the mobile platform via multi-lateration based on the time of transmission and a time of reception of each of the ADS-B messages and the position information for the mobile reference devices. - View Dependent Claims (7, 8, 9, 10)
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11. One or more non-transitory computer readable storage media encoded with software comprising computer executable instructions and, when the software is executed, operable to:
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determine a time of transmission of each of a plurality of Automatic Dependent Surveillance-Broadcast (ADS-B) messages received at a mobile platform from a respective plurality of mobile reference devices, each of the ADS-B messages being broadcast beginning at one of a plurality of message start opportunity (MSO) times having known timings relative to a reference time, wherein each of the ADS-B messages contains position information for the mobile reference device transmitting the message and a MSO value indicating the MSO time at which transmission of the message started; and determine a position of the mobile platform via multi-lateration based on the time of transmission and a time of reception of each of the ADS-B messages and the position information for the mobile reference devices. - View Dependent Claims (12, 13, 14, 15)
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16. A method of determining the position of a mobile device, comprising:
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receiving at the mobile device a plurality of Automatic Dependent Surveillance-Broadcast (ADS-B) messages from a respective plurality of mobile ADS-B broadcasting devices; determining a time of reception of each of the ADS-B messages received at the mobile device; determining a time of transmission of each of the ADS-B messages received at the mobile device from information contained in a field of each of the ADS-B messages or within a field of respective subsequent messages; and determining a position of the mobile device via multi-lateration based on the time of transmission and the time of reception of the ADS-B messages and position information for the mobile ADS-B broadcasting devices contained in the ADS-B messages received at the mobile device. - View Dependent Claims (17, 18, 19, 20)
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Specification