Methods, systems, and computer readable media for mitigation of in-band interference of global positioning system (GPS) signals
First Claim
1. A method of enhanced GPS receiving by mitigating interference in reception of global positioning system (GPS) signals, the method comprising:
- receiving, from a first antenna, a first signal comprising a desired signal component S1 and a jammer signal component J1;
receiving, from a second antenna, a second signal comprising a desired signal component S2 and a jammer signal component J2;
introducing a test phase shift into one of the first and second signals;
combining, by a modifier circuit, the first and second signals after introducing the test phase shift to create a third signal; and
measuring an amplitude of the third signal at a first time after introducing the test phase shift;
deterministically calculating a phase shift based on the amplitude of the third signal at the first time and amplitudes of the first and second signals;
at a second time later than the first time;
modifying, using the modifier circuit, the second signal so that jammer signal component J2 is substantially anti-phase with respect to jammer signal component J1 by applying the calculated phase shift to the second signal; and
combining, by the modifier circuit, the modified second signal and the first signal to create the third signal so that, after the second time, the third signal contains desired signal components S1 and S2 and jammer signal component J2 substantially cancels jammer signal component J1.
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Accused Products
Abstract
Methods, systems, and computer readable media for mitigation of interference of GPS signals are disclosed providing selective mitigation of in-band interference implementing deterministic phase control. In one embodiment, a system for mitigating interference of GPS signals includes a pair of antennas, each receiving GPS signals that include both a desired signal component and a jammer signal component. The signal from one antenna is phase-shifted as needed to make it anti-phase with the signal from the other antenna, so that when the two signals are combined, the jammer signal components substantially cancel each other, leaving the desired signal components. Determining the phase shift required involves deterministically calculating the phase shift based on the amplitudes of the two input signals and the amplitude of the combined signal instead of the iterative techniques used in conventional systems.
78 Citations
39 Claims
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1. A method of enhanced GPS receiving by mitigating interference in reception of global positioning system (GPS) signals, the method comprising:
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receiving, from a first antenna, a first signal comprising a desired signal component S1 and a jammer signal component J1; receiving, from a second antenna, a second signal comprising a desired signal component S2 and a jammer signal component J2; introducing a test phase shift into one of the first and second signals; combining, by a modifier circuit, the first and second signals after introducing the test phase shift to create a third signal; and measuring an amplitude of the third signal at a first time after introducing the test phase shift; deterministically calculating a phase shift based on the amplitude of the third signal at the first time and amplitudes of the first and second signals; at a second time later than the first time; modifying, using the modifier circuit, the second signal so that jammer signal component J2 is substantially anti-phase with respect to jammer signal component J1 by applying the calculated phase shift to the second signal; and combining, by the modifier circuit, the modified second signal and the first signal to create the third signal so that, after the second time, the third signal contains desired signal components S1 and S2 and jammer signal component J2 substantially cancels jammer signal component J1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 29)
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19. A system for enhanced GPS receiving by mitigating interference in reception of global positioning system (GPS) signals, the system comprising:
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a first antenna for receiving a first GPS signal comprising a desired signal component S1 and a jammer signal component J1; a second antenna for receiving a second GPS signal comprising a desired signal component S2 and a jammer signal component J2; and a modifier circuit configured for; introducing a test phase shift into one of the first and second signals, combining the first and second signals after introducing the test phase shift to create a third signal, measuring an amplitude of the third signal at a first time after introducing the test phase shift, and deterministically calculating a phase shift based on the amplitude of the third signal at the first time and amplitudes of the first and second signals; at a second time later than the first time, modifying the second signal so that jammer signal component J2 is substantially anti-phase with respect to jammer signal component J1, by applying the calculated phase shift to the second signal, and using the modified second signal to modify the first signal to create the third signal so that, after the second time, the third signal contains desired signal components S1 and S2 and jammer signal component J2 substantially cancels jammer signal component J1. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification