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Advanced Waveform Synthetics biography, Advanced Waveform Synthetics discography
Auto Kinetic and Armin Ascari produce 4 tracks that are worthy of any dance floor worldwide.Armin's distinctive Carinthia techno sound and Auto Kinetic's Midwest beats and sounds make this the most unique release on Analog to date.How Many Fingers Am I Holding Up?Option 125 simultaneously delivers 1.High sampling rates of either 1.MHz of modulation bandwidth (for the 625 MHz sampling rate).See a photo of the small modular size mounted in a rack.Option 330, direct digital synthesis, provides efficient compression of narrowband modulation on a carrier.Availability, pricing, quotes, service requests...Services to help solve your test and measurement problems.Subscribe now for instant product and application news!Subscribe now for instant product and application news!SAR) capability
Issued on: January 13, 1998
Inventor: Loiz, et al.Heretofore, the application of large pulse compression
ratio biphase codes for ultra high range resolution synthetic array radar
resulted in poor performance due to large range sidelobes.It would therefore be desirable to have a technique that uses very large
pulse compression ratio biphase codes to provide an advanced waveform used
in synthetic array radar systems.SUMMARY OF THE INVENTION
The present invention comprises a processing method for use in providing
improved SAR imagery at high duty factors that provides for enhanced radar
sensitivity.SAR waveform generated using a biphase code
with a predetermined high pulse compression ratio.Received radar returns
comprising a SAR map are Fourier transformed and multiplied by a stored
set of complex weights.The processing method achieves excellent performance
at high duty factors for enhanced radar sensitivity.Doppler mismatch for a 28561:1 compound Barker code.The resultant weighted radar signal is
then inverse Fourier transformed to obtain compressed range bins.For targets at different Doppler frequencies, the range sidelobes degrade
but additional rejection is achieved by pulse to pulse processing that
overcomes this problem.For the example
presented below, the entire SAR processing (with a 371293:1 pulse
compression ratio) requires a throughput of about 3 GCOPS.SAR waveform 10 in accordance with the
principles of the present invention employing a large pulse compression
ratio is shown in FIG.SAR waveform 10
generated using a biphase code with a predetermined high pulse compression
ratio.This produces n equalized spectrum of the scene.The interpolation reduces the
far pulse compression sidelobes and thus improves the integrated sidelobe
ratio (ISLR).The filtered SAR map is converted 28 to polar
format.Magnitude detection and post processing
32 of the azimuth and range compressed SAR map is then done to format the
data for display 33.B, there were 2 samples per chip, the size of
the FFT is 196.The performance with a Doppler mismatch corresponding to an azimuth shift
of a pixel is shown in FIG.B, there were 2 samples per chip, the size of the FFT is
196.As can be seen from FIGS.ISLR due to this
mismatch.Clearly, numerous and other arrangements can be readily devised by those
skilled in the art without departing from the scope of the invention.March 6, 1990
Mel Evenson received a design patent for the ornamental design for a paperclip holder.The method recited in claim 1 further comprising the step of processing received radar returns comprising the SAR map using motion compensation phase adjustment processing to provide a motion compensated SAR map.The method recited in claim 2 further comprising the step of resampling the motion compensated SAR map.The method recited in claim 1 further comprising the step of low pass filtering the Fourier transformed and complex weighted SAR map to reduce the number of range bins.The method recited in claim 1 further comprising the step of polar formatting the weighted transformed SAR map before the inverse Fourier transforming step.The method recited in claim 1 wherein the complex weights are optimized for range sidelobe performance, resolution and weighting loss.The method recited in claim 11 further comprising the step of resampling the motion compensated SAR map.The method recited in claim 11 further comprising the step of low pass filtering the Fourier transformed and complex weighted SAR map to reduce the number of range bins.The method recited in claim 11 further comprising the step of polar formatting the weighted transformed SAR map before the inverse Fourier transforming step.The present invention relates generally to synthetic array radar (SAR) systems, and more particularly, to a technique that uses very large pulse compression ratio biphase codes to provide an advanced waveform used in synthetic array radar systems.It would be desirable to improve the range sidelobes of long biphase codes at enhanced radar sensitivities to provide for improved overall system performance.The inverse Fourier transformed SAR map is then processed for display.The processing method allows implementation and processing of very large pulse compression ratio biphase codes for ultra high resolution synthetic array radar systems.The processing method greatly improves the range sidelobes of long biphase codes at enhanced radar sensitivities and overall system performance.In addition, the processing method provides for an efficient implementation of large pulse compression ratio biphase codes.The processing method achieves low peak range sidelobes and excellent integrated sidelobe ratio (ISLR) at a low weighting loss.The present invention may be used in synthetic array radar systems used for reconnaissance, for example.The present invention provides a high duty factor ultra high resolution biphase coded waveform for use with the synthetic array radar systems that produces improved sensitivity and image quality.Doppler mismatch for a 28561:1 compound Barker code.The present invention provides for a technique for processing large pulse compression ratio biphase codes for ultra high resolution synthetic array radar (SAR) applications.Barker codes of up to 135:1 (371293:1) pulse compression ratios.SAR waveform generated using a biphase code with a predetermined high pulse compression ratio is multiplied by a stored set of complex weights.The resultant weighted radar signal is then inverse Fourier transformed to obtain compressed range bins.For an actual high resolution SAR mode, polar formatting is performed on the weighted transformed radar signal before the inverse Fourier transform.These sidelobes apply to targets of the same Doppler frequency.For targets at different Doppler frequencies, the range sidelobes degrade but additional rejection is achieved by pulse to pulse processing that overcomes this problem.Only high speed moving ground objects with Doppler frequencies that are ambiguous relative to the PRF have higher range sidelobes that are not rejected by the pulse to pulse processing.SAR imagery to about 100 km at a PRF of 680 Hz.SAR waveform 10 generated using a biphase code with a predetermined high pulse compression ratio.Radar returns comprising a SAR map are digitized 22 by an analog to digital converter (ADC),which is performed at a 1.SAR map is resampled 24, by means of a finite impulse response filter (FIR), for example, using a pulse to pulse resampling ratio of about 30:1.The interpolation reduces the far pulse compression sidelobes and thus improves the integrated sidelobe ratio (ISLR).Intrapulse low pass filtering 27 is then performed on the Fourier transformed and complex weighted SAR map to reduce the number of range bins to a desired number.Range compression 29 is achieved by range weighting and inverse Fourier transforming (FFT) the SAR map.Optional autofocus processing 30 is performed the array time is 60 seconds for the exemplary processing scenario.Azimuth compression 31 is achieved by performing a weighted pulse to pulse FFT on the SAR map.Magnitude detection and post processing 32 of the azimuth and range compressed SAR map is then done to format the data for display 33.B, there were 2 samples per chip, the size of the FFT is 196.The length of the time domain weighting window was constrained to be twice the pulse length.The performance with a Doppler mismatch corresponding to an azimuth shift of a pixel is shown in FIG.B, there were 2 samples per chip, the size of the FFT is 196.ISLR due to this mismatch.Higher Doppler frequency offsets are rejected by pulse to pulse processing.Thus, a processing method that provides for very large pulse compression ratio biphase codes that may be used in synthetic array radar systems has been disclosed.Clearly, numerous and other arrangements can be readily devised by those skilled in the art without departing from the scope of the invention.Full 3D Tomography for the Crustal Structure of the Los Angeles Region
Po Chen, Li Zhao, and Thomas H.The original waveforms without perturbation.Correcting the
synthetic waveform using GSDF measurements made at one sampling
frequency 0.Correcting synthetic waveform using
GSDF measurements made at three sampling frequencies, 0.Correcting the synthetic waveform using GSDF
measurements made at five sampling frequencies 0.View larger version (19K)
Figure 2.Waveform misfit without time shifts and envelope misfit between the shifted synthetic data and the synthetics as a function of depth.Solution parameters are summarized in
Table 3.Shaded areas show the
time windows used for the inversion.Hz) was
applied to both observed and synthetic waveforms.An example of comparing waveforms using GSDF measurements.The P wave on the
SoCaL synthetic waveform (dashed line) is used as an isolation filter.Examples of waveforms measured by a grid array.The waveforms are
plotted in the order of measurement from left to right as marked by the
numbers for grid point for traverses from a to i as
indicated in Figure 1.The result by the proper parameter is indicated by an
arrow.Hz, except station 4601, for which raw data are shown.Amplitudes are
scaled to the maximum for each trace.LAF3D (red lines in second column).The observed seismograms are
shown in black lines in second column.In the third and fourth
columns, circles are GSDF measurements of LAF3D synthetics relative
to CVM3.Comparison for selected S waves.An Overview of the Damaging and Low Magnitude Mw 4.La Paca Earthquake on 29 January 2005: Context, Seismotectonics, and Seismic Risk Implications for Southeast Spain
B.View larger version (59K)
Figure 7.La Paca
mainshock and the 4 February aftershock.Granada moment tensor project
(www.View larger version (139K)
Figure 8.Waveforms are recorded
at station WA02 (vertical) and are aligned relative to their P onsets.Stacked
waveforms are shown in the bottom trace.Note: Text based on automatic Optical Character Recognition processes.BACKGROUND
The present invention relates generally to synthetic array radar (SAR) systems,
and more particularly, to a technique that uses very large pulse compression ratio
biphase codes to provide an advanced waveform used in synthetic array radar
systems.The assignee of the present invention designs and develops synthetic array
radar systems.It would also be desirable to have an efficient
implementation of large pulse compression ratio biphase codes for use in synthetic
array radar systems.It would therefore be desirable to have a technique that uses very large pulse
compression ratio biphase codes to provide an advanced waveform used in synthetic
array radar systems.SAR waveform generated using a biphase code with a predetermined high
pulse compression ratio.The
resultant radar signal (the Fourier transformed complex weighted SAR map) is then
inverse Fourier transformed to obtain compressed range bins that correspond to a
SAR map having enhanced sensitivity.The inverse Fourier transformed SAR map is
then processed for display.The processing method allows implementation and processing of very large
pulse compression ratio biphase codes for ultra high resolution synthetic array radar
systems.The processing method greatly improves the range
sidelobes of long biphase codes at enhanced radar sensitivities and overall system
performance.In addition, the processing method provides for an efficient
implementation of large pulse compression ratio biphase codes.The resultant
weighted radar signal is then inverse Fourier transformed to obtain compressed range
bins.For an actual high resolution SAR mode, polar formatting is performed on the
weighted transformed radar signal before the inverse Fourier transform.Doppler offset small enough to prevent pulse to pulse rejection.ADC), which is performed at a 1.The filtered SAR map is converted 28 to polar format.As can be seen, the weighting loss is 1.This function is triggered when the user clicks a menu item.I'm leaving it because it works!It features enhanced capability in terms of coverage, range of incidence angles, polarisation, and modes of operation.Technical Characteristics Accuracy Radiometric resolution in range: 1.Wide Swath mode: approx 150m x 150m.Global Monitoring mode: approx 1000m x 1000m.The Envisat data transmission via Artemis (ESA Data Relay Satellite) will be interrupted starting on 6 March 2008 as a consequence of the use of Artemis by the ESA first ATV (Automated Transfer Vehicle) mission.European polar acquisition stations (Svalbard and Kiruna).March 2008, and will allow acquisition of all Low Bit Rate data and partial acquisition of High Rate data (ASAR High Rate modes, MERIS Full Resolution mode).The European coverage of ASAR High Rate and MERIS Full Resolution data should be maintained.Outside Europe, priorities for High Rate data acquisition will be given to Category 2 use while maintaining collection of consistent datasets, in particular with MERIS Full Resolution data as well as with ASAR data for the International Polar Year.ESA stations will not be affected by the Artemis unavailability.The current baseline is to resume the nominal Envisat data transmission through Artemis in early April, shortly after ATV docking to ISS foreseen on 3 April 2008.
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