IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0175758
(2011-07-01)
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등록번호 |
US-8508404
(2013-08-13)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
7 |
초록
▼
The present invention is directed to fuze system for munition that produces a height-of-burst (HOB) signal using two Global Positioning System (GPS) signals, the first signal being from a particular GPS satellite (the direct GPS signal) and the second signal being the GPS signal from the same GPS sa
The present invention is directed to fuze system for munition that produces a height-of-burst (HOB) signal using two Global Positioning System (GPS) signals, the first signal being from a particular GPS satellite (the direct GPS signal) and the second signal being the GPS signal from the same GPS satellite after the signal has been reflected from the surface adjacent to the target. In one embodiment, the HOB signal is generated when there is a substantial correlation between the reflected GPS signal and direct GPS delayed by an amount of time that is indicative of the desired HOB.
대표청구항
▼
1. A munition with a passive height-of-burst (HOB) fuze system comprising: a munition;a HOB system, operatively attached to the munition, for producing a HOB signal for the munition at a desired HOB, the system comprising: GPS signal acquisition and demodulation circuitry for acquiring direct and re
1. A munition with a passive height-of-burst (HOB) fuze system comprising: a munition;a HOB system, operatively attached to the munition, for producing a HOB signal for the munition at a desired HOB, the system comprising: GPS signal acquisition and demodulation circuitry for acquiring direct and reflected GPS signals for a particular GPS satellite and demodulating the direct and reflected GPS signals to respectively produce a direct pseudo-random code and a reflected pseudo-random code;correlation circuitry for producing a correlation signal indicative of the correlation between the direct pseudo-random code delayed by a period of time related to the desired HOB and the reflected pseudo-random code; andHOB detection circuitry for processing the correlation signal to determine when the munition is at or near a desired HOB and, if at or near the desired height, produce an HOB signal. 2. A munition, as claimed in claim 1, wherein the correlation circuitry comprises: a first delay line for the direct pseudo-random code, the first delay line having two or more direct taps each for providing a sample of the direct pseudo-random code delayed by the period of time relative to a corresponding sample of the reflected pseudo-random code;a second delay line for the reflected pseudo-random code, the second delay-line having two or more reflected taps each for providing a sample of the reflected pseudo-random code;an array of logic gates with each logic gate operatively connected to a direct tap and a corresponding reflected tap and producing an output signal indicative of the correlation of the sampled direct pseudo-random code and the sampled reflected pseudo random code; anda summer for summing the output signals from each of the logic gates to produce a correlation signal. 3. A munition, as claimed in claim 1, wherein the HOB detection circuitry comprises: a differentiator for determining a slope of a curve associated with the correlation signal; anda comparator for identifying a transition in the slope of the curve from a negative/positive slope to a non-negative/non-positive slope and producing the HOB signal after identifying the transition. 4. A munition, as claimed in claim 1, wherein the HOB detection circuitry comprises: a comparator for comparing the correlation signal to a predetermined value and generating the HOB signal if the correlation signal equals or exceeds the predetermined value. 5. A munition, as claimed in claim 1, wherein the HOB detection circuitry comprises: a first input for receiving the correlation signal; anda second input for receiving a another correlation signal that relates to a another GPS satellite that is different than the particular GPS satellite. 6. A munition, as claimed in claim 5, wherein the HOB detection circuitry comprises: a weighting circuit for weighing the correlation signal and the another correlation signal in determining whether to issue the HOB signal. 7. A munition, as claimed in claim 1, wherein the HOB detection circuitry comprises: at least three inputs, one input for receiving the correlation signal relating to the particular GPS satellite and the other inputs each for receiving a correlation signal associated with a different GPS satellite;a majority circuit for determining if a majority of the correlation signals indicate that the munition is at or about at the desired HOB. 8. A height-of-burst (HOB) fuze system for use with a munition, the system comprising: GPS signal acquisition and demodulation circuitry for acquiring a direct signal and reflected GPS signals for a particular GPS satellite and demodulating the direct and reflected GPS signal to respectively produce a direct pseudo-random code and a reflected pseudo-random code;correlation circuitry for producing a correlation signal indicative of the correlation between the direct pseudo-random code delayed by a period of time related to the desired HOB and the reflected pseudo-random code; andHOB detection circuitry for processing the correlation signal to determine when the munition is at or near a desired HOB and, if at or near the desired height, produce an HOB signal. 9. A height-of-burst (HOB) fuze system, as claimed in claim 8, wherein: the GPS signal acquisition and demodulation circuitry comprises: a first antenna for receiving the direct GPS signal; anda second antenna for receiving the reflected GPS signal. 10. A height-of-burst (HOB) fuze system, as claimed in claim 9, wherein: each of the first and second antennas is tuned to an L1 carrier frequency. 11. A height-of-burst (HOB) fuze system, as claimed in claim 9, wherein: the first antenna is tuned to one of an L1 carrier frequency and an L2 carrier frequency; andthe second antenna is tuned to one of an L1 carrier frequency and an L2 carrier frequency. 12. A height-of-burst (HOB) fuze system, as claimed in claim 9, wherein: the first antenna is a right-hand circularly polarized antenna; andthe second antenna is a left-hand circularly polarized antenna. 13. A height-of-burst (HOB) fuze system, as claimed in claim 8, wherein the correlation circuitry comprises: a first delay line for the direct pseudo-random code, the first delay line having two or more direct taps each for providing a sample of the direct pseudo-random code delayed by the period of time relative to a corresponding sample of the reflected pseudo-random code;a second delay line for the reflected pseudo-random code, the second delay-line having two or more reflected taps each for providing a sample of the reflected pseudo-random code;an array of logic gates with each logic gate operatively connected to a direct tap and a corresponding reflected tap and producing an output signal indicative of the correlation of the sampled direct pseudo-random code and the sampled reflected pseudo random code; anda summer for summing the output signals from each of the logic gates to produce a correlation signal. 14. A height-of-burst (HOB) fuze system, as claimed in claim 13, wherein the HOB detection circuitry comprises at least one of the following: a differentiator, a comparator, a weighting circuit, and a majority circuit. 15. A method for determining when a munition is at a desired height-of-burst comprising: providing a munition;receiving, at the munition, a direct GPS signal from a satellite;receiving, at the munition, a reflected GPS signal from the satellite;delaying the direct GPS signal by a time delay that is representative of the desired height-of-burst to produce a delayed GPS signal;assessing the correlation of the reflected GPS signal and the direct GPS signal delayed by the time delay; andproviding, at the munition, a HOB signal if there is a high degree of correlation between the reflected GPS signal and the direct GPS signal delayed by the time delay. 16. A method, as claimed in claim 15, further comprising: using a desired HOB and one of an angle α and θ, each associated with the direct and reflected GPS signals from the satellite, to determine the time delay. 17. A method, as claimed in claim 15, wherein: the step of delaying occurring at the munition. 18. A method, as claimed in claim 15, wherein: the step of assessing occurring at the munition.
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