Automatic dependant surveillance systems and methods
DCFirst Claim
1. A communications system including an automated dependent surveillance-broadcast system and a global positioning system integrated into a single unit comprising:
- a radio frequency receiver for receiving analog automated dependent surveillance-broadcast information at a selected transmission frequency and converting said information into digitized automatic dependent surveillance-broadcast information;
a global positioning system receiver for receiving global positioning information including timing information; and
a processing subsystem for decoding the digitized automated dependent surveillance-broadcast information in response to the timing information provided by the global positioning system receiver, wherein the radio frequency receiver comprises;
analog processing circuitry for receiving the analog automated dependent surveillance-broadcast information at a selected transmission frequency and down-converting said analog information to an intermediate center frequency;
circuitry for splitting the analog information into first and second sub-channels;
circuitry for up-shifting the first sub-channel from the intermediate center frequency by a selected amount and for down-shifting the second sub-channel from the intermediate frequency by the selected amount;
a first filter tuned to the frequency of the first sub-channel for generating a logic one output; and
a second filter tuned to the frequency of the second sub-channel for generating a logic zero output.
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Abstract
A communications system including an automated dependant surveillance-broadcast system and a global positioning system integrated into a single unit. A radio frequency receiver receives analog automated dependent surveillance-broadcast information at a selected transmission frequency and converts that information into digital form. A global positioning system receiver receives global positioning information including timing information. A processing subsystem decodes the digitized automated dependent surveillance-broadcast information in response to the timing information received by the global positioning system receiver.
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Citations
20 Claims
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1. A communications system including an automated dependent surveillance-broadcast system and a global positioning system integrated into a single unit comprising:
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a radio frequency receiver for receiving analog automated dependent surveillance-broadcast information at a selected transmission frequency and converting said information into digitized automatic dependent surveillance-broadcast information; a global positioning system receiver for receiving global positioning information including timing information; and a processing subsystem for decoding the digitized automated dependent surveillance-broadcast information in response to the timing information provided by the global positioning system receiver, wherein the radio frequency receiver comprises; analog processing circuitry for receiving the analog automated dependent surveillance-broadcast information at a selected transmission frequency and down-converting said analog information to an intermediate center frequency; circuitry for splitting the analog information into first and second sub-channels; circuitry for up-shifting the first sub-channel from the intermediate center frequency by a selected amount and for down-shifting the second sub-channel from the intermediate frequency by the selected amount; a first filter tuned to the frequency of the first sub-channel for generating a logic one output; and a second filter tuned to the frequency of the second sub-channel for generating a logic zero output. - View Dependent Claims (2, 18, 19, 20)
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3. An automated dependent surveillance-broadcast receiving system with an integral global positioning receiver comprising:
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a first radio frequency receiver for receiving first analog automated dependent surveillance-broadcast information at a first selected transmission frequency and converting said first analog information into first digitized automatic dependent surveillance-broadcast information; a second radio frequency receiver for receiving second analog automated dependent surveillance-broadcast information at a second selected transmission frequency and converting said second analog information into second digitized automatic dependent surveillance-broadcast information; a global positioning system receiver for receiving global positioning information including timing information; and a processing subsystem for decoding at least one the first and second digitized automated dependent surveillance-broadcast information in response to the timing information provided by the global positioning system receiver. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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12. An airborne communication and surveillance system, comprising:
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First means for receiving a first analog automated dependent surveillance-broadcast information at a first frequency and converting said analog information to a first digitized signal; Second means for receiving a second analog automated dependent surveillance-broadcast information at a second frequency and converting said second analog information to a second digitized signal; Third means for receiving global positioning information including timing information; and Fourth means for decoding at least one of the first digitized signal and the second digitized signal in response to the timing information. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification