FREQUENCY MODULATED CONTINUOUS WAVE RADIO ALTIMETER SPECTRAL MONITORING
First Claim
1. A radio altimeter tracking filter, the filter comprising:
- a wireless radio interface;
a processor coupled to the wireless radio interface;
a memory coupled to the wireless radio interface;
wherein the wireless radio interface is configured to wirelessly receive a radio altimeter signal and convert the radio altimeter signal to a baseband frequency signal, wherein the a radio altimeter signal sweeps across a first frequency spectrum between a first frequency and a second frequency;
wherein the processor is configured to pass the baseband frequency signal through a filter executed by the processor, the filter comprising a passband having a first bandwidth, and wherein the filter outputs a plurality of spectral chirps in response to the baseband frequency signal passing through the first bandwidth;
wherein the processor is configured to process the plurality of spectral chirps to output characteristic parameters that characterize the radio altimeter signal.
1 Assignment
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Accused Products
Abstract
In one embodiment, a radio altimeter tracking filter is provided. The filter comprises: a wireless radio interface; a processor coupled to the wireless radio interface; a memory coupled to the wireless radio interface; wherein the wireless radio interface is configured to wirelessly receive a radio altimeter signal and convert the radio altimeter signal to a baseband frequency signal, wherein the a radio altimeter signal sweeps across a first frequency spectrum between a first frequency and a second frequency; wherein the processor is configured to pass the baseband frequency signal through a filter executed by the processor, the filter comprising a passband having a first bandwidth, and wherein the filter outputs a plurality of spectral chirps in response to the baseband frequency signal passing through the first bandwidth; wherein the processor is configured to process the plurality of spectral chirps to output characteristic parameters that characterize the radio altimeter signal.
14 Citations
20 Claims
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1. A radio altimeter tracking filter, the filter comprising:
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a wireless radio interface; a processor coupled to the wireless radio interface; a memory coupled to the wireless radio interface; wherein the wireless radio interface is configured to wirelessly receive a radio altimeter signal and convert the radio altimeter signal to a baseband frequency signal, wherein the a radio altimeter signal sweeps across a first frequency spectrum between a first frequency and a second frequency; wherein the processor is configured to pass the baseband frequency signal through a filter executed by the processor, the filter comprising a passband having a first bandwidth, and wherein the filter outputs a plurality of spectral chirps in response to the baseband frequency signal passing through the first bandwidth; wherein the processor is configured to process the plurality of spectral chirps to output characteristic parameters that characterize the radio altimeter signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of monitoring radio altimeter spectrum in an avionics system, the method comprising:
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receiving a radio altimeter (RA) radio frequency (RF) signal; converting the RA RF signal, wherein the RA RF signal sweeps across a first frequency spectrum between a first frequency and a second frequency; filtering the down-converted signal by passing the down-converted signal through a passband having a first bandwidth to output a plurality of spectral chirps in response to passing the down-converted signal through the first bandwidth; and processing the plurality of spectral chirps to output characteristic parameters that characterize the RA RF signal. - View Dependent Claims (15, 16, 17, 18)
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14. The method of claim 14, wherein converting the RA RF signal further comprises converting the RA RF signal to a baseband frequency signal.
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19. A wireless communication system, the system comprising:
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a plurality of device nodes aboard an aircraft that share a radio frequency spectrum using time-division multiple access (TDMA); a radio altimeter tracking filter configured to output characteristic parameters characterizing a radio altimeter signal transmitted by a radio altimeter aboard the aircraft; a timeslot allocation function coupled to the radio altimeter tracking filter, wherein the timeslot allocation function allocates timeslots to channels within the radio frequency spectrum based on the characterization parameters; wherein the radio altimeter tracking filter is configured to wirelessly receive the radio altimeter signal and convert the radio altimeter signal to a baseband frequency signal, wherein the a radio altimeter signal sweeps across the radio frequency spectrum between a first frequency and a second frequency; wherein the radio altimeter tracking filter implements a filter comprising a passband having a first filter bandwidth, wherein the filter outputs a plurality of spectral chirps in response to the baseband frequency signal passing through the first bandwidth; wherein the radio altimeter tracking filter is configured to process the plurality of spectral chirps to output the characteristic parameters that characterize the radio altimeter signal. - View Dependent Claims (20)
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Specification