Method for locating multiple angle sources using a monopulse radar
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-013/44
G01S-013/00
출원번호
US-0357455
(2006-02-09)
등록번호
US-7330149
(2008-02-12)
발명자
/ 주소
Weatherford,Shaun David
출원인 / 주소
The United States of America as represented by the Secretary of the Navy
대리인 / 주소
Kalmbaugh,David S.
인용정보
피인용 횟수 :
4인용 특허 :
5
초록▼
A monopulse radar tracking method which analyzes boresight error information provided a monopulse radar to determine a location for two targets. The monopulse radar tracking method analyzes the boresight error information to determine an angle of arrival for a dominant target and a secondary target
A monopulse radar tracking method which analyzes boresight error information provided a monopulse radar to determine a location for two targets. The monopulse radar tracking method analyzes the boresight error information to determine an angle of arrival for a dominant target and a secondary target.
대표청구항▼
What is claimed is: 1. A method for locating multiple angle sources using a monopulse radar comprising the steps of: (a) receiving a composite radio frequency (RF) signal which includes a first RF signal reflected from a dominant target and a second RF signal from a secondary target, wherein said m
What is claimed is: 1. A method for locating multiple angle sources using a monopulse radar comprising the steps of: (a) receiving a composite radio frequency (RF) signal which includes a first RF signal reflected from a dominant target and a second RF signal from a secondary target, wherein said monopulse radar receives said composite RF signal; (b) calculating a voltage amplitude S1 for said first RF signal across a sample size wherein said voltage amplitude S1 for said first RF signal is calculated by finding a maximum automatic gain control (AGC) power level across said sample size and a minimum AGC power level across said sample size, and then adding said maximum AGC power level to said minimum AGC power level to determine said voltage amplitude S1; (c) calculating a voltage amplitude S2 for said second RF signal across said sample size wherein said voltage amplitude S2 is calculated by subtracting said minimum AGC power level from said maximum AGC power level; (d) looping across a preset number of samples obtained from said sample size to find a beat pattern for said first and second RF signals which are competing with each other; (e) locating nulls in said beat pattern caused by a destructive interference between said first RF signal and said second RF signal; (f) calculating a pitch angle and a yaw angle for said first RF signal wherein said pitch angle and said yaw angle for said first RF signal are calculated within a beat period between adjacent nulls in said beat pattern; and (g) calculating a pitch angle and a yaw angle for said second RF signal wherein said pitch angle and said yaw angle for said second RF signal are calculated within the beat period between said adjacent nulls in said beat pattern. 2. The method of claim 1 wherein the voltage amplitude S1 for said first RF signal is calculated according to the following expression; description="In-line Formulae" end="lead"S1=��*sqrt(Max AGC Pwr)+��*sqrt(Min AGC Pwr)description="In-line Formulae" end="tail" where: Max AGC Pwr is the maximum AGC power level across said sample size; and Min AGC Pwr is the minimum AGC power level across said sample size. 3. The method of claim 1 wherein the voltage amplitude S2 for said second RF signal is calculated according to the following expression: description="In-line Formulae" end="lead"S2=��*sqrt(Max AGC Pwr)-��*sqrt(Min AGC Pwr)description="In-line Formulae" end="tail" where: Max AGC Pwr is the maximum AGC power level across said sample size; and Min AGC Pwr the minimum AGC power level across said sample size. 4. The method of claim 1 wherein said pitch angle and said yaw angle for said dominant target are calculated using averaged boresight error information which indicates an angle of arrival for said dominate target. 5. The method of claim 4 wherein said averaged boresight information is determined in accordance with the following expressions: description="In-line Formulae" end="lead"pbselrg=mean(pbse)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ybselrg=mean(ybse)description="In-line Formulae" end="tail" where: pbselrg is pitch bore sight error for said first RF signal, and ybselrg is yaw bore sight error for said second RF signal; and description="In-line Formulae" end="lead"pbselrgmean=average(pbselrg(1),pbselrg(2) . . . pbselrg(n))description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Pbselrgvar=variance(pbselrg(1),pbselrg(2) . . . pbselrg(n))description="In-line Formulae" end="tail" where: pbselrgmean is an average of the pitch bore sight error for the beat periods with said sample size; and Pbselrgvar is a variance for the beat periods with said sample size. 6. The method of claim 5 wherein said averaged boresight error information includes the following expressions: description="In-line Formulae" end="lead"ybselrgmean=average(ybselrg(1),ybselrg(2) . . . ybselrg(n))description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Ybselrgvar=variance(ybselrg(1),ybselrg(2) . . . ybselrg(n))description="In-line Formulae" end="tail" where: ybselrgmean is an average of the yaw bore sight error for the beat periods with said sample size; and Ybselrgvar is a variance of the yaw bore sight error for the beat periods within said sample size. 7. The method of claim 5 wherein said pitch angle and said yaw angle for said second RF signal are calculated in accordance with the following expressions: description="In-line Formulae" end="lead"pbsemldc=(1/S2)2*PDC-(S1/S 2)2*pbselrgdescription="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ybsemldc=(1/S2)2*YDC-(S1/S 2)2*ybselrgdescription="In-line Formulae" end="tail" where pbsemldc is the pitch angle for said second RF signal; ybsemldc is the yaw angle for said second RF signal; and PDC and YDC are defined by the following expressions: description="In-line Formulae" end="lead"PDC=mean(pbsesum2)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"YDC=mean(ybsesum2)description="In-line Formulae" end="tail" where pbsesum2 is linearized AGC power multiplied by the pitch bore sight error for said first RF signal and ybsesum2 is the linearized AGC power multiplied by the yaw bore sight error for said first RF signal. 8. A method for locating multiple angle sources using a monopulse radar comprising the steps of: (a) receiving a composite radio frequency (RF) signal which includes a first RF signal reflected from a dominant target and a second RF signal from a secondary target, wherein said monopulse radar receives said composite signal; (b) calculating a voltage amplitude S1 for said first RF signal across a sample size wherein the voltage amplitude S1 for said first RF signal is calculated by finding a maximum automatic gain control (AGC) power level across said sample size and a minimum AGC power level across said sample size, the voltage amplitude S1 for said first RF signal being calculated according to the following expression; description="In-line Formulae" end="lead"S1=��*sqrt(Max AGC Pwr)+��*sqrt(Min AGC Pwr)description="In-line Formulae" end="tail" where: Max AGC Pwr is the maximum AGC power level across said sample size; and Min AGC Pwr is the minimum AGC power level across said sample size; (c) calculating a voltage amplitude S2 for said second RF signal across said sample size, wherein the voltage amplitude S2 for said second RF signal is calculated according to the following expression; description="In-line Formulae" end="lead"S2=��*sqrt(Max AGC Pwr)-��*sqrt(Min AGC Pwr)description="In-line Formulae" end="tail" where: Max AGC Pwr is the maximum AGC power level across said sample size; and Min AGC Pwr the minimum AGC power level across said sample size; (d) looping across a preset number of samples obtained from said sample size to find a beat pattern for said first and second RF signals which are competing with each other; (e) locating nulls in said beat pattern caused by a destructive interference between said first RF signal and said second RF signal; (f) calculating a pitch angle and a yaw angle for said first RF signal wherein said pitch angle and said yaw angle for said first RF signal are calculated within a beat period between adjacent nulls in said beat pattern; and (g) calculating a pitch angle and a yaw angle for said second RF signal wherein said pitch angle and said yaw angle for said second RF signal are calculated within the beat period between said adjacent nulls in said beat pattern, said pitch angle and said yaw angle for said second RF signal being calculated in accordance with the following expressions: description="In-line Formulae" end="lead"pbsemldc=(1/S2)2*PDC-(S1/S 2)2*pbselrgdescription="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ybsemldc=(1/S2)2*YDC-(S1/S 2)2*ybselrgdescription="In-line Formulae" end="tail" where pbsemldc is the pitch angle for said second RF signal; ybsemldc is the yaw angle for said second RF signal; pbselrg is pitch bore sight error for said first RF signal; ybselrg is yaw bore sight error for said first RF signal; and PDC and YDC are defined by the following expressions: description="In-line Formulae" end="lead"PDC=mean(pbsesum2)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"YDC=mean(ybsesum2)description="In-line Formulae" end="tail" where pbsesum2 is linearized AGC power multiplied by the pitch bore sight error for said first RF signal and ybsesum2 is the linearized AGC power multiplied by the yaw bore sight error for said first RF signal. 9. The method of claim 8 wherein said pitch angle and said yaw angle for said dominant target are calculated using averaged boresight error information which indicates an angle of arrival for said dominate target. 10. The method of claim 9 wherein said averaged boresight information is determined in accordance with the following expressions: description="In-line Formulae" end="lead"pbselrg=mean(pbse)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ybselrg=mean(ybse)description="In-line Formulae" end="tail" where: pbselrg is pitch bore sight error for said first RF signal, and ybselrg is yaw bore sight error for said second RF signal; and description="In-line Formulae" end="lead"pbselrgmean=average(pbselrg(1),pbselrg(2) . . . pbselrg(n))description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Pbselrgvar=variance(pbselrg(1),pbselrg(2) . . . pbselrg(n))description="In-line Formulae" end="tail" where: pbselrgmean is an average of the pitch bore sight error for the beat periods with said sample size; and Pbselrgvar is a variance of the pitch bore sight error for the beat periods within said sample size. 11. The method of claim 10 wherein said averaged boresight error information includes the following expressions: description="In-line Formulae" end="lead"ybselrgmean=average(ybselrg(1),ybselrg(2) . . . ybselrg(n))description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Ybselrgvar=variance(ybselrg(1),ybselrg(2) . . . ybselrg(n))description="In-line Formulae" end="tail" where: ybselrgmean is an average of the yaw bore sight error for the beat periods with said sample size; and Ybselrgvar is a variance of the yaw bore sight error for the beat periods within said sample size. 12. The method of claim 8 wherein a user of said method selects said preset number of samples obtained from said sample size to find said beat pattern. 13. A method for locating multiple angle sources using a monopulse radar comprising the steps of: (a) receiving a composite radio frequency (RF) signal which includes a first RF signal reflected from a dominant target and a second RF signal from a secondary target, wherein said monopulse radar receives said composite signal; (b) calculating a voltage amplitude S1 for said first RF signal across a sample size wherein the voltage amplitude S1 for said first RF signal is calculated by finding a maximum automatic gain control (AGC) power level across said sample size and a minimum AGC power level across said sample size, the voltage amplitude S1 for said first RF signal being calculated according to the following expression; description="In-line Formulae" end="lead"S1=��*sqrt(Max AGC Pwr)+��*sqrt(Min AGC Pwr)description="In-line Formulae" end="tail" where: Max AGC Pwr is the maximum AGC power level across said sample size; and Min AGC Pwr is the minimum AGC power level across said sample size; (c) calculating a voltage amplitude S2 for said second RF signal across said sample size, wherein the voltage amplitude S2 for said second RF signal is calculated according to the following expression; description="In-line Formulae" end="lead"S2=��*sqrt(Max AGC Pwr)-��*sqrt(Min AGC Pwr)description="In-line Formulae" end="tail" where: Max AGC Pwr is the maximum AGC power level across said sample size; and Min AGC Pwr the minimum AGC power level across said sample size; (d) looping across a preset number of samples obtained from said sample size to find a beat pattern for said first and second RF signals which are competing with each other; (e) locating nulls in said beat pattern caused by a destructive interference between said first RF signal and said second RF signal; (f) calculating a pitch angle and a yaw angle for said first RF signal wherein said pitch angle and said yaw angle for said first RF signal are calculated within a beat period between adjacent nulls in said beat pattern; and (g) calculating a pitch angle and a yaw angle for said second RF signal, wherein said pitch angle and said yaw angle for said second RF signal are calculated within the beat period between said adjacent nulls in said beat pattern, said pitch angle and said yaw angle being calculated in accordance with the description="In-line Formulae" end="lead"pbsemlac=(1/S1*S2))*PAC-pbselrg description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ybsemlac=(1/S1*S2))*YAC-ybselrg description="In-line Formulae" end="tail" where pbsemlac is the pitch angle for said second RF signal; ybsemlac is the yaw angle for said second RF signal; pbselrg is pitch bore sight error for said first RF signal; ybselrg is yaw bore sight error for said first RF signal, PAC is an AC amplitude for a pitch sine wave and YAC is an AC amplitude for a yaw sine wave, wherein said pitch sine wave is represented by the following expression: description="In-line Formulae" end="lead"pbsesum2=pbse*Linear Powerdescription="In-line Formulae" end="tail" and said yaw sine wave is represented by the following expression: description="In-line Formulae" end="lead"ybsesum2=ybse*Linear Powerdescription="In-line Formulae" end="tail" and each of said pitch and yaw sine waves having a DC offset. 14. The method of claim 13 wherein the AC amplitude PAC for said pitch sine wave is determined by finding peak to peak values for said pitch sine wave and dividing by two and the AC amplitude YAC for said yaw sine wave is determined by finding peak to peak values for said yaw sine wave and dividing by two. 15. The method of claim 14 wherein the AC amplitude PAC for said pitch sine wave and the AC amplitude YAC for said yaw sine wave are represented by the following expressions: description="In-line Formulae" end="lead"PAC=(max(pbsesum2)-min(pbsesum2))/2description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"YAC=(max(ybsesum2)-min(ybsesum2))/2description="In-line Formulae" end="tail" where max(pbsesum2)-min(pbsesum2, and max(ybsesum2)-min(ybsesum2) are the peak to peak values for said pitch sine wave and said yaw sine wave, respectively. 16. The method of claim 13 wherein the AC amplitude PAC for said pitch sine wave and the AC amplitude YAC for said yaw sine wave are represented by the following expressions: description="In-line Formulae" end="lead"PAC=sqrt[2*mean(PACtmp*PACtmp)] description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"YAC=sqrt[2*mean(YACtmp*YACtmp)] description="In-line Formulae" end="tail" where description="In-line Formulae" end="lead"PACtmp=pbsesum2-PDC description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"YACtmp=pbsesum2-YDC description="In-line Formulae" end="tail" and PDC and YDC are DC components of said pitch sine wave and said yaw sine wave, respectively. 17. The method of claim 13 wherein said pitch angle and said yaw angle for said dominant target are calculated using averaged boresight error information which indicates an angle of arrival for said dominate target. 18. The method of claim 17 wherein said averaged boresight information is determined in accordance with the following expressions: description="In-line Formulae" end="lead"pbselrg=mean(pbse)description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"ybselrg=mean(ybse)description="In-line Formulae" end="tail" where: pbselrg is pitch bore sight error for said first RF signal, and ybselrg is yaw bore sight error for said second RF signal; and description="In-line Formulae" end="lead"pbselrgmean=average(pbselrg(1),pbselrg(2) . . . pbselrg(n))description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Pbselrgvar=variance(pbselrg(1),pbselrg(2) . . . pbselrg(n))description="In-line Formulae" end="tail" where: pbselrgmean is an average of the pitch bore sight error for the beat periods with said sample size; and Pbselrgvar is a variance of the pitch bore sight error for the beat periods within said sample size. 19. The method of claim 18 wherein said averaged boresight error information includes the following expressions: description="In-line Formulae" end="lead"ybselrgmean=average(ybselrg(1),ybselrg(2) . . . ybselrg(n))description="In-line Formulae" end="tail" description="In-line Formulae" end="lead"Ybselrgvar=variance(ybselrg(1),ybselrg(2) . . . ybselrg(n))description="In-line Formulae" end="tail" where: ybselrgmean is an average of the yaw bore sight error for the beat periods with said sample size; and Ybselrgvar is a variance of the yaw bore sight error for the beat periods within said sample size. 20. The method of claim 13 wherein a user of said method selects said preset number of samples obtained from said sample size to find said beat pattern.
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