[특허]Method and system for calibration of a radio direction finder

Elta Systems Ltd.

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특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Method and system for calibration of a radio direction finder

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-013/00 H04B-001/00 H04M-001/00
미국특허분류(USC)	342/159; 455/063; 455/001; 455/552; 375/134
출원번호	US-0113129 (2005-04-25)
등록번호	US-7312746 (2007-12-25)
발명자 / 주소	Yehudaie,Efraim
출원인 / 주소	Elta Systems Ltd.
대리인 / 주소	Browdy and Neimark, P.L.L.C.
인용정보	피인용 횟수 : 1 인용 특허 : 6

초록
▼

A calibration method and a system for providing calibration data for use with a direction finder are provided. The method comprises providing a relative motion of a calibration receiver in a circle manner with respect to calibration transmitter at a predetermined distance from each other. The method also includes preparing and transmitting a communication frequency signal employed for transmitting a certain frequency from a list of predetermined frequencies. The preparing comprises: (a) setting a value of the dwell time ranges of the communication frequency signal to a predetermined value; (b) synchronizing in time the dwell time ranges between the calibration transmitter and the calibration receiver by using clock signals of a common synchronization source; (c) providing a hop duration time interval within the dwell time range for transmitting the frequency; and (d) generating the communication frequency signal corresponding to the frequency during the hop duration interval. At the calibration receiver end, the method includes scanning the list of predetermined frequencies; intercepting a frequency signal transmitted during the hop duration time interval within the dwell time ranges; and rejecting all other frequency signals received within the dwell time ranges having duration different than the hop duration time interval by the receiver.

대표
청구항
▼

The invention claimed is: 1. A calibration system for providing calibration data for use with a direction finder, comprising: (a) a calibration transmitter including: (i) a transmitting antenna, (ii) a transmitter synchronization module configured for providing transmitter clock signals, (iii) a signal generator operable for transmitting communication frequency signals corresponding to a list of predetermined frequencies, (iv) a controller unit coupled to said transmitter synchronization module and said frequency signal generator, and configured for receiving said transmitter synchronization clock signals and producing controller signals required for triggering operation of the frequency signal generator to generate the communication frequency signals sequentially from said list of predetermined frequencies and to transmit said communication frequency signals only during hop duration intervals located within dwell time ranges of said communication frequency signals; and (b) a remote calibration receiver including: (i) an array of receiving antennas for receiving radio frequency transmissions from the calibration transmitter, (ii) a receiver synchronization module configured for providing receiver clock signals, (iii) an onboard direction finder sensor associated with said array of receiving antennas and coupled to the receiver synchronization module, the direction finder sensor being configured for scanning the list of predetermined frequencies, intercepting frequency signals transmitted during said hop duration time intervals located within the dwell time ranges, rejecting all other frequency signals received within the dwell time ranges having duration different than said hop duration time intervals, producing a Signal Descriptor based on the intercepted frequency signals and creating said calibration data based on said Signal Descriptor; and (c) at least one clock source coupled to the transmitter synchronization module and the receiver synchronization module, and being configured for synchronizing clock signals provided by the transmitter and receiver synchronization modules. 2. The calibration system of claim 1 wherein said synchronization source is selected from GPS and atomic clock. 3. The calibration system of claim 1 wherein said hop duration time intervals are located in the middle of the dwell time ranges. 4. The calibration system of claim 1 wherein the direction finder sensor further configured for rejecting all other frequency signals received within the dwell time ranges having location different than said hop duration time intervals. 5. The calibration system of claim 1 wherein the direction finder sensor is selected from COMINT system, ELINT system and radar direction finding systems employing an interferometer technique. 6. The calibration system of claim 1 wherein said calibration transmitter is arranged at a terrestrial calibration station. 7. The calibration system of claim 1 wherein said calibration transmitter is arranged at a non-terrestrial calibration station mounted on a mobile platform, selected from an aircraft, ship and satellite. 8. The calibration system of claim 1 wherein said calibration receiver is arranged at a terrestrial calibration station. 9. The calibration system of claim 1 wherein said calibration receiver is arranged at a nonterrestrial calibration station mounted on a mobile platform selected from an aircraft, ship and satellite. 10. A method for providing calibration data for use with a direction finder, comprising: (A) providing a relative motion of a calibration receiver with respect to calibration transmitter at a predetermined distance from each other, (B) setting a predetermined value of at least one dwell time range of a communication frequency signal employed for transmitting at least one frequency from a list of predetermined frequencies; (C) providing a hop duration time interval within said at least one dwell time range for transmitting said at least one frequency; (D) generating said communication frequency signal corresponding to said at least one frequency; (E) transmitting said communication frequency signal by the calibration transmitter towards said calibration receiver only during said hop duration time interval; (F) providing synchronization in time between the calibration transmitter and the calibration receiver for said at least one dwell time range by using clock signals of a synchronization source; (G) scanning the list of predetermined frequencies by the calibration receiver; (H) intercepting a frequency signal transmitted during the hop duration time interval within said at least one dwell time range by the calibration receiver; (I) rejecting all other frequency signals received within said at least one dwell time range having duration different than said hop duration time interval by the receiver; (J) producing a Signal Descriptor based on the frequency signal intercepted in step (H); (K) creating said calibration data based on said Signal Descriptor. 11. The method of claim 10 wherein said hop duration time interval is located in the middle of the dwell time range. 12. The method of claim 10 wherein said providing of the hop duration time interval within the dwell time range includes: defining a predetermined location of said hop duration interval within the dwell time range; calculating a time delay required for locating said hop duration interval at said predetermined location. 13. The method of claim 10 wherein a value of said time delay is calculated in accordance with an equation tD =(tDW-th)/2-S/c , where tDis the time delay; tDW is the dwell time range; th is the hop duration interval; S is the distance between the calibration transmitter and the calibration receiver; and c is the light velocity. 14. The method of claim 10 further comprising rejecting all other frequency signals received within said at least one dwell time range having location different than said hop duration time interval. 15. The method of claim 10 wherein the value of said at least one dwell time range is selected to be so short that a magnitude of a signal-to-noise ratio was in the limits of the magnitude required by the calibration receiver. 16. The method of claim 10 wherein the value of said at least one dwell time range is between 0.2 milliseconds and 100 milliseconds. 17. The method of claim 10 wherein said calibration data are built in a calibration table.

이 특허에 인용된 특허 (6)

이 특허를 인용한 특허 (1)

Lee, Jung Hoon; Lee, Kyu Song; Park, Beom Jun; Lee, Byeong Nam, System and method for removing channel phase error in a phase comparison direction finder.

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특허 상세정보

Method and system for calibration of a radio direction finder

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이 특허에 인용된 특허 (6)

이 특허를 인용한 특허 (1)

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특허 상세정보

Method and system for calibration of a radio direction finder

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이 특허에 인용된 특허 (6)

이 특허를 인용한 특허 (1)

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IPC 상세정보(version : 201201)

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