US 11,698,461 B1 · GPS denial detection and reporting and mitigation

Abstract

A system and method of identifying and responding to a GPS denial of service includes: configuring a mode S transponder for transmitting a GPS time-of-day message as a downlink format message using a BDS register, and configuring an aircraft surveillance system for receiving one or more GPS time-of-day messages transmitted as a downlink format message. The surveillance system compares the received time-of-day message(s) from the aircraft to a comparison time of day, and validates reception of authentic GPS signals by the aircraft when the received time-of-day message is within a threshold amount of the comparison time of day. The comparison time of day may be the GPS time of day of one of a plurality of aircraft in the surveillance volume or may be the GPS time of day determined by the aircraft surveillance system. An indicator on the transponder indicates counterfeit GPS signals, permitting mitigation od induced navigation error.

Claims14

Dependent claims

A method of identifying and responding to a global positioning system (GPS) denial of service, said method comprising the steps of:

equipping an aircraft with a mode S airborne transponder;
configuring the aircraft's mode S transponder for transmitting a GPS-derived time-of-day as a message;
transmitting the aircraft's time-of-day message as a downlink format message using an available binary data storage (BDS) register;
configuring an aircraft surveillance system for receiving a GPS time-of-day message transmitted as a downlink format message;
receiving, by the aircraft surveillance system, the time-of-day message from the aircraft;
configuring the aircraft surveillance system for comparing the received time-of-day message from the aircraft to a comparison time of day;
validating reception of authentic GPS signals by the aircraft when the received time-of-day message is within a threshold amount of the comparison time of day;
indicating when the received time-of-day message is beyond the threshold amount of the comparison time of day;
and
mitigating erroneous aircraft navigation when the received time-of-day message is beyond the threshold amount of the comparison time of day.

7 more elements

A system configured to identify and mitigate a denial of authentic global positioning system (GPS) signals to one or more aircraft, said system comprising:

a mode S transponder on a first aircraft, said mode S transponder configured to transmit a GPS-derived time-of-day message as a downlink format message;
an aircraft surveillance system, said aircraft surveillance system configured to receive the GPS-derived time-of-day message transmitted as a downlink format message from said mode S transponder of the first aircraft;
wherein said aircraft surveillance system is further configured to compare the received time-of-day message from said mode S transponder of the first aircraft to a comparison time of day;
wherein said aircraft surveillance system is further configured to validate the GPS reception of the mode S transponder on the first aircraft when the received time-of-day message from the first aircraft is within a threshold amount of said comparison time of day;
and
a hardware indicator, said hardware indicator configured to indicate when the received time-of-day message from the first aircraft is greater than said threshold amount from said comparison time of day to permit mitigation of erroneous aircraft navigation based on the denial of authentic GPS signals.

3 more elements

Dependencies are inferred from the claim text.

GPS denial detection and reporting and mitigation

Life of this patent

GPS denial detection and reporting and mitigation

Life of this patent

Abstract

Claims14