Diversity polarization modulation

Patent metadata

Field	Value
Publication number	US-2020412439-A1
Application number	US-201815993246-A
Country	US
Kind code	A1
Filing date	May 30, 2018
Priority date	May 30, 2018
Publication date	Dec 31, 2020
Grant date	—

Abstract

A method includes transmitting a digital code from a transmitter to a receiver. Information is transmitted via electromagnetic waves from the transmitter to the receiver. The transmission of the information includes transmitting a first portion of the information using electromagnetic waves with a first polarization in response to a first value of the digital code, and transmitting a second portion of the information using electromagnetic waves of a second polarization in response to a second value of the digital code. The first information may include a first navigational code and the second information may include a second navigational code.

First claim

1 . A method comprising:
transmitting a digital code that comprises a pseudo-random code from a transmitter to a receiver; transmitting information including a first navigational code and a second navigational code via electromagnetic waves from the transmitter to the receiver, wherein transmitting the information comprises:
transmitting the first navigational code using electromagnetic waves with a first polarization in response to a first value of the digital code; and
transmitting the second navigational code using electromagnetic waves of a second polarization in response to a second value of the digital code,
wherein the transmitting the first navigational code and the transmitting the second navigational code result in polarization hopping of the first polarization and the second polarization between different types of polarization over time according to a random pattern of the pseudo-random code.

2 . The method of claim 1 , wherein the first navigational code and the second navigational code are transmitted consecutively in time.

3 . (canceled)

4 . The method of claim 1 , wherein:
the first polarization comprises one of right hand circular polarization, left hand circular polarization, right hand elliptical polarization, left hand elliptical polarization, and/or linear polarization; and the second polarization comprises another of right hand circular polarization, left hand circular polarization, right hand elliptical polarization, left hand elliptical polarization, and/or linear polarization.

5 . The method of claim 1 , wherein transmitting the digital code from the transmitter to the receiver comprises transmitting the digital code encrypted with an encryption key known to the receiver.

6 . The method of claim 1 , wherein transmitting the information comprises transmitting the information using a crossed dipole antenna.

7 . The method of claim 1 , wherein transmitting the first navigational code comprises transmitting the first navigational code with a first helical antenna providing right hand circular polarized electromagnetic waves; and
wherein transmitting the second navigational code comprises transmitting the second navigational code with a second helical antenna providing left hand circular polarized electromagnetic waves.

8 . The method of claim 1 , wherein transmitting the first navigational code and transmitting the second navigational code comprises transmitting the first navigational code and the second navigational code at the same time as a combined linearly polarized signal.

9 . A method comprising:
receiving, at a receiver from a transmitter, a digital code comprising a pseudo-random code; receiving, at the receiver, first electromagnetic waves; decoding, using correlation, a first navigational code from the first electromagnetic waves corresponding to a first polarization in response to a first value of the digital code, wherein the first polarization includes polarization hopping between different types of the first polarization over time according to a random pattern of the pseudo-random code, and the decoding includes determining the different types of the first polarization using the pseudo-random code; receiving, at the receiver, second electromagnetic waves; and decoding, using correlation, a second navigational code from the second electromagnetic waves corresponding to a second polarization in response to a second value of the digital code, wherein the second polarization includes polarization hopping between different types of second polarization over time according to the random pattern of the pseudo-random code, and the decoding the second navigational code includes determining the different types of second polarization using the pseudo-random code.

10 . The method of claim 9 , wherein the first polarization comprises one of right hand circular polarization, left hand circular polarization, right hand elliptical polarization, left hand elliptical polarization, and/or linear polarization; and
the second polarization comprises another of right hand circular polarization, left hand circular polarization, right hand elliptical polarization, left hand elliptical polarization, and/or linear polarization.

11 . (canceled)

12 . The method of claim 9 , wherein receiving the digital code comprises receiving an encrypted code; and
further comprising decrypting the encrypted code with an encryption key stored at the receiver.

13 . The method of claim 9 , wherein the first polarization comprises right hand circular polarization; and
wherein the second polarization comprises left hand circular polarization.

14 . The method of claim 13 , further comprising determining a total power measurement of the first electromagnetic waves combined with the second electromagnetic waves; and
determining that a jammer signal is included in at least one of the first electromagnetic waves and/or the second electromagnetic waves in response to the total power measurement exceeding a predetermined threshold.

15 . The method of claim 14 , further comprising:
making a power measurement of a right hand circular polarized portion of the first and second electromagnetic waves; making a power measurement of a left hand circular polarized portion of the first and second electromagnetic waves; comparing the power measurement of the right hand circular polarized portion and the power measurement of the left hand circular polarized portion; and determining a polarization of the jammer signal in response to the comparing of the power measurement of the right hand circular polarized portion and the power measurement of the left hand circular polarized portion.

16 . The method of claim 15 , further comprising providing anti jamming processing in response to determining the polarization of the jamming signal.

17 . A method comprising encoding a first signal of a first channel of a transmitter with a first navigational code;
encoding a second signal of the first channel of the transmitter with a second navigational code; encoding a first signal of a second channel of the transmitter with the first navigational code; encoding a second signal of the second channel of the transmitter with the second navigational code; phase shifting the first signal of the first channel by 90 degrees relative to the first signal of the second channel; phase shifting the second signal of the second channel by 90 degrees relative to the second signal of the first channel; combining the first signal of the first channel with the second signal of the first channel to generate a first channel combined signal; combining the first signal of the second channel with the second signal of the second channel to generate a second channel combined signal; and transmitting the first channel combined signal and the second channel combined signal such that the first signal is transmitted with right hand elliptical polarization and the second signal is transmitted with left hand elliptical polarization.

18 . The method of claim 17 , wherein transmitting the first channel combined signal and the second channel combined signal comprises transmitting the first signal with right hand circular polarization and the second signal with left hand circular polarization.

19 . The method of claim 18 , wherein transmitting the first channel combined signal comprises transmitting the first channel combined signal via a first radiating element of a crossed dipole antenna; and
wherein transmitting the second channel combined signal comprises

Assignees

• Eagle Tech Llc

Inventors

• Kossin Philip
• Pigon Brett

Classifications

• H04B2201/70715

  with application-specific features · CPC title

• H04B7/10 Primary

  Polarisation diversity; Directional diversity · CPC title

• H04B1/69

  Spread spectrum techniques · CPC title

• H04B2001/6904

  using code hopping · CPC title

• H01Q15/244

  converting a linear polarised wave into a circular polarised wave (guided wave H01P1/17) · CPC title