Methods for detecting the flight path of projectiles
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-013/58
G01S-013/50
G01S-013/72
G01S-013/44
출원번호
US-0002618
(2012-02-29)
등록번호
US-9470786
(2016-10-18)
우선권정보
DE-10 2011 012 680 (2011-03-01)
국제출원번호
PCT/DE2012/000209
(2012-02-29)
§371/§102 date
20130920
(20130920)
국제공개번호
WO2012/116689
(2012-09-07)
발명자
/ 주소
Schneider, Robert
Weiss, Georg
Gruener, Wilhelm
출원인 / 주소
EADS Deutschland GmbH
대리인 / 주소
Crowell & Moring LLP
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
Methods for detecting the flight path of projectiles involve a sequence of N target detections that include detecting the measured velocities and azimuthal angle bearings of the projectile along the flight path of the projectile by Doppler radar at the times tn, wherein n=1 . . . N, and determining
Methods for detecting the flight path of projectiles involve a sequence of N target detections that include detecting the measured velocities and azimuthal angle bearings of the projectile along the flight path of the projectile by Doppler radar at the times tn, wherein n=1 . . . N, and determining the flight path and the direction of motion of the projectile are from these measurements. The measurements are adapted in a first nonlinear parameter fit to an analytical relationship of the time curve of the radial velocity of the projectile while the projectile passes through the detection range of the radar and so that the absolute projectile velocity, minimum distance of the project flight path from the radar, time at which the projectile passes the point having the minimum distance, flight path direction in azimuth, and flight path direction in elevation can be estimated.
대표청구항▼
1. A method for the detection of the trajectory of projectiles, comprising: recording, by a continuous wave Doppler radar that is configured for both bearing indication and speed measurement, a series of N target detections at points in time tn with n=1. . . N with measured speeds vrad(tn) and azimu
1. A method for the detection of the trajectory of projectiles, comprising: recording, by a continuous wave Doppler radar that is configured for both bearing indication and speed measurement, a series of N target detections at points in time tn with n=1. . . N with measured speeds vrad(tn) and azimuthal angle bearings α(tn) of the projectile along the trajectory of the projectile, wherein the continuous wave Doppler radar comprises a plurality of transmission/reception modules for different spatial angle sectors;determining a trajectory and direction of motion of the projectile based on the measured speeds vrad(tn) and azimuthal angle bearings α(tn) of the projectile along the trajectory of the projectile, wherein said determining the trajectory and direction of motion of the projectile comprises: estimating absolute projectile speed v0, minimum distance of projectile trajectory from the radar d, and estimated point in time td at which the projectile passes a point at a minimum distance d by adapting the speed measurements vrad(tn) in a first non-linear parameter fit to an analytical relationship of a time profile of the measured radial speed vrad(t) of the projectile when passing through the detection region of the radar,estimating a trajectory direction in azimuth α0by adapting, in a second non-linear parameter fit, the measured azimuthal angle bearings α(tn) to an analytical relationship of a time profile of the angular direction in azimuth α(t), anddetermining an azimuth direction of the point αd at the minimum distance of the projectile trajectory from the continuous wave Doppler radar by interpolating the series of the measured azimuthal angle bearings α(tn) at a point in time t=td wherein a transmission antenna of at least one of the plurality of transmission/reception modules includes two antennas having a vertical angular offset and transmitting simultaneously with different frequencies fTx1 and fTx2=fTx1+Δf, wherein the frequency difference Δf is from 100 Hz to 100 kHz. 2. The method as claimed in claim 1, wherein an additional series of N angular bearings of the projectile in elevation ε(tn) along the trajectory of the projectile is recorded, a trajectory direction in elevation ε0is estimated by adapting the measurements in a third non-linear parameter fit to an analytical relationship of the time profile of an angular direction in elevation ε(t), and determining the azimuth direction of a point εd at the minimum distance of the projectile trajectory from the continuous wave Doppler radar by interpolation of the series of measurement values ε(tn) at the point in time t=td. 3. The method as claimed in claim 1, wherein the azimuthal angle bearings are measured using a amplitude monopulse or phase monopulse. 4. The method as claimed in claim 1, wherein directionally selective antenna patterns are generated using digital beam forming. 5. The method as claimed in claim 1, a transmission signal of the continuous wave Doppler radar is subjected to a sinusoidal frequency modulation, wherein a frequency range is analyzed for a second harmonic of the modulation signal in a radar receiver. 6. The method as claimed in claim 1, further comprising: band pass sampling a received signal to digitize the received signal. 7. The method as claimed in claim 6, further comprising: integrating the received signal using FFT blocks with different lengths to extend coherent integration time in Doppler processing. 8. The method as claimed in claim 7, wherein prior to the integration of the received signal, a hypothetical correction of a profile of the received signal is performed by multiplication with a set of linear frequency chirps of different ramp gradient and time duration. 9. The method as claimed in claim 1, wherein a working frequency of the continuous wave Doppler radar is in a Ku band or K band. 10. The method as claimed in 1, wherein a working frequency of the continuous wave Doppler radar is in a S band or C band.
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이 특허에 인용된 특허 (4)
Gray Roger L. (King George VA), Method of guiding an in-flight vehicle to a desired flight path.
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