Method and device for obtaining attitude under interference by a GSP receiver equipped with an array antenna
First Claim
1. A system for determining attitude relative a predefined coordinate frame using signals received from global positioning system satellites, said system comprising:
- an array antenna containing a plurality of antenna elements, wherein each of said antenna elements receives signals from the global positioning system satellites;
a GPS receiver coupled to said array antenna for determining the longitude, latitude and altitude of said array antenna from the received signals;
an angular measurement circuit coupled to said array antenna and said GPS receiver for determining the angles of arrival of the signals received by the array antenna; and
an attitude determination containing a Kalman filter that receives the angular offsets from said angular measurement circuit and calculates the attitude of the array antenna, relative the predefined coordinate frame, from the angles of the signals received.
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Abstract
A GPS receiver that determines its own attitude under jamming conditions is created by augmenting it with an array antenna and a novel signal processing system. The augmented signal processing system comprises a cascaded parallel architecture inserted between the array antenna and the GPS receiver. A blind adaptive nulling processor is cascaded ahead of the GPS receiver so that the GPS receiver can operate on the jamming-suppressed signals in a normal manner. A monopulse angular measurement unit in series with an attitude determination unit interacts in parallel with the blind adaptive nulling processor and the GPS receiver. Constrained beamforming adaptive monopulse is used to simultaneously place nulls in both the sum and difference beams toward jammers while maintaining the monopulse ratio for accurate angular measurement. In this way, the GPS receiver is capable of providing rotational information in addition to regular time and translation information.
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Citations
16 Claims
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1. A system for determining attitude relative a predefined coordinate frame using signals received from global positioning system satellites, said system comprising:
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an array antenna containing a plurality of antenna elements, wherein each of said antenna elements receives signals from the global positioning system satellites;
a GPS receiver coupled to said array antenna for determining the longitude, latitude and altitude of said array antenna from the received signals;
an angular measurement circuit coupled to said array antenna and said GPS receiver for determining the angles of arrival of the signals received by the array antenna; and
an attitude determination containing a Kalman filter that receives the angular offsets from said angular measurement circuit and calculates the attitude of the array antenna, relative the predefined coordinate frame, from the angles of the signals received. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of determining the attitude of an antenna array relative a predetermined coordinate frame using signals from global positioning system satellites, said method comprising the steps of:
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providing an array antenna that contains a plurality of antenna elements;
detecting the signals from the global positioning system satellites with the array antenna;
converting the signals received by the array antenna into corresponding digital signals;
calculating the angles of arrival of the signals received by the array antenna; and
calculating an attitude for the array antenna from the angles of arrival of the signals. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
determining the location of the array antenna from the GPS receiver;
reading the location of the global positioning system satellites from the GPS signals;
calculating line of sight vectors between said array antenna and the global positioning system satellites utilizing the location of the array antenna and location of the global positioning system satellites;
calculating a three axis vectors corresponding to the GPS signals; and
calculating attitude utilizing the three axis vectors converted from angles of arrival of GPS signals and line of sight vectors between said array antenna and the global positioning system satellites.
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16. A method of determining the attitude of an antenna array relative a predetermined coordinate frame using signals from global positioning system satellites, said method comprising the steps of:
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providing an array antenna that contains a plurality of antenna elements;
detecting the signals from the global positioning system satellites with the array antenna;
suppressing signals received by the array antenna other than the signals from the global positioning system satellites calculating the angles of arrival of the signals received by the array antenna; and
calculating an attitude for the array antenna from the angles of arrival of the signals.
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Specification