1 edition of High radar resolution with the step frequency waveform found in the catalog.
High radar resolution with the step frequency waveform
Abraham Thomas Paulose
by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va
Written in English
High range resolution can be obtained using a number of methods including ultra-wideband radar, intrapulse pulse compression, and super- resolution techniques. This thesis investigates the achievement of high radar range resolution by means of the step frequency waveform. The key advantage of the step frequency approach compared to other methods is the wide total bandwidth resulting in high range resolution while still maintaining a narrow instantaneous bandwidth which eases A/D sampling requirements. The effects of various waveform parameters on the high resolution range profile are determined for both noise and clutter limited environments. A novel technique is developed which enhances the resolution of moving targets in clutter and estimates the target velocity. This method consists of clutter cancellation followed by successive velocity compensations. Finally, design methods are developed to optimize system performance in a low PRF mode for both noise and clutter limited environments.
|Statement||Abraham Thomas Paulose|
|The Physical Object|
|Pagination||97 p. ;|
|Number of Pages||97|
Radar Bands Radar Band Frequency HF 3 – 30 MHz VHF 30 – MHz UHF – MHz L 1 – 2 GHz allow high power. Radar has no blind ranges. Radar has blind ranges between range resolution and waveform energy. Pulse Compression Range response is the auto-correlation of the. An unmodulated continuous wave radar has no range resolution, but can resolve targets on the basis of different velocity, while a modulated or pulsed radar can resolve echoes from different ranges. The radar waveform plays a very important role in radar theory (Plant and Shuler, ).
waveform does have a feature that is required to make its operation permissible in the United States. With this waveform the frequency sidelobes can be suppressed to the degree that HF radar is an acceptable occupant of the HF spectrum. This is in contrast with the waveforms used by radars radiating from the former Soviet by: The present state of the U.S. national high-frequency (HF) radar network has resulted from nearly 40 years of research and applications. HF radar observations of the ocean surface truly began with Crombie’s () experimental discovery of the mechanism behind .
The use of stepped-frequency waveforms to obtain high range resolution is well documented [8, 10]. An advantage of the stepped-frequency approach for obtaining high range resolution is the reduction of the instantaneous bandwidth and sampling rate requirements of the radar system. To satisfy the accuracy and the short measurement time without increasing the RF front-end loading, the three-segment waveform with different slopes shown in Fig. 3 is adopted, where the chirp frequency bandwidth is B, (a) the Segment 1 is the up ramp with ramp time T 1, (b) the Segment 2 is the down ramp with ramp time T 1, and (c) the Segment 3 is the check ramp with ramp time T by:
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High range resolution can be obtained using a number of methods including ultra-wideband radar, intrapulse pulse compression, High radar resolution with the step frequency waveform book super- resolution techniques.
This thesis investigates the achievement of high radar range resolution by means of the step frequency : Full text of "High radar resolution with the step frequency waveform" See other formats — qV 0V30i «oo\ ^ Approved for public release, distribution is unlimited HIGH RADAR RANGE RESOLUTION WITH THE STEP FREQUENCY WAVEFORM by Abraham Thomas Paulose Lieutenant, United States Navy B.S., University of California, Berkeley, Submitted in partial fulfillment of the requirements.
Step Frequency High PRF Waveform Design [Paulo A. Soares, G. Gill] on *FREE* shipping on qualifying offers. This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEE RING report procured by the Pentagon and made available for public release.
It has been reproduced in the best form available to the Pentagon. Instead of a single pulse modulated over MHz, we can step say, 10MHz per pulse for pulses and get the same result. The advantage comes from incrementing transmit frequency in sync with the LO, creating the same IF from pulse to pulse.
Hence, no wideband receiver, no high ADC sample by: The radar system required about 80 hours to collect one complete aperture of high-resolution, fully polarimetric data.
Its peak power was at kW with a pulse repetition frequency of 40 Hz, and the average transmitted power was about 20 mW. Creating the radar image required the railSAR to limit the Fourier processing to very small patches. HIGH-RESOLUTION RADAR (HRR) WAVEFORMS Waveform 0 Spectrum 1 dB -5amplitude Impulse amplitude 0 0 dB -5 1amplitude Monocycle 0 frequency, MHz 0 -1 dB -5 1 Ricker wavelet 0 time, nsFig.
Impulse waveforms with their. Here, a new approach to the pulse compression techniques by means of phase modulating the stepped frequency waveform (SFW) with constant and varying step sizes is advanced. In order to make the signal less detectable, phase modulation techniques such as Barker codes and polyphase codes have been employed in : R.
Vignesh, G. Shanmugha Sundaram, R. Gandhiraj. Step-frequency is a radar waveform consisting of a series of sine waves with linearly increasing frequency.
The radar measures the phase and amplitude on each frequency and used an inverse Fourier transform of these data to build a time domain profile (A-scan). SF radar is known as a technique to achieve high range resolution profile by using SRP processing. The basic concept of this radar is that the several narrow bandwidth pulses of which center frequency is changed step by step during each pulses are synthesized.
The mechanism of SF radar is firstlyFile Size: KB. The radar signals of the compound pulsed radar modulation type are considered here, with the combination of stepped frequency waveform (SFW) and a four-level pulse amplitude modulation (PAM4).
The SFW is capable of high range resolution (HRR), while PAM4 can provide a lower : K. Keerthana, G. Shanmugha Sundaram. Stepped frequency radar technology, where the transmit waveform consists of a sequence of tones, has long been suggested for cost-effective and high-resolution applications.
Ultra-wideband (also known as UWB, ultra-wide band and ultraband) is a radio technology that can use a very low energy level for short-range, high-bandwidth communications over a large portion of the radio spectrum. UWB has traditional applications in non-cooperative radar recent applications target sensor data collection, precision locating and tracking applications.
A step-frequency is a radar waveform consisting of a train of sine waves whose frequency increases linearly in discrete steps. The transmitted signal can be represented by a staircase function in a frequency versus time plot, as shown in Fig.
1, where each step of the staircase corresponds to a sine wave with a specific frequency f n of the nth sine wave is given by (1) f n = f 0 Author: Egil Eide, Neil Linford, Raffaele Persico, Jacopo Sala.
In the Step-Frequency (SF) waveform the frequencies are transmitted one by one after each other. A general rule for UWB radars is that all of the different waveform techniques have different methods to reduce the sampling requirement. In this radar a multi bit high resolution ADC can be used.
Figure 5. The step frequency radar does this Cited by: 9. the high-resolution mapping of thin coal seam structures in open-cut coal mines.
The GHz frequency band is selected to meet the performance requirements of one metre penetration and five centimetre resolution in coal. A novel technique is presented which corrects the broadband quadrature receiver errors in the stepped-frequency radar by: High Frequency Radar Surface Currents What is High Frequency (HF) Radar.
An HF Radar antenna (courtesy of Jim Pettigrew) HF radar systems utilize high frequency radio waves to measure the surface currents in the coastal ocean.
Radar antennas (typically in pairs) are positioned on shore and can measure surface currents (the top m of the water column) up to km away with resolutions.
resolution is possible but very costly energy and money wise. This has been solved in the impulse waveform only taking one receive samp le for each transmitted pulse. In the Step-Frequency (SF) waveform the frequencies are transmitted one by one after each other. A Source: Radar Technology, Book edited by: Dr.
Guy Kouemou. geophysical surfaces. The radar operates from GHz and is capable of being operated in either monostatic and bistatic mode. The radar has the high resolution of a step-frequency radar and the range-gating capability of the FMCW radar.
The radar has a wide range of applications including high-resolution probing of geophysical. Range resolution of m is provided by a stepped-frequency waveform with MHz of bandwidth.
The maximum transmitted power from the feed antenna is 30 mW. The received signals are down-converted to the intermediate frequency and sent via the umbilical cable to the radar electronics box and recorded by the computer.
The purpose of this thesis is to design and test a waveform which requires low power, has high resolution, rejects ambiguous targets and detects moving targets with a high carrier to noise ratio. The proposed waveform and processing is implemented on sensor interfaces built by D-TA Systems.
Waveform Design and ProcessingFile Size: 5MB. Continuous-Wave Stepped-Frequency Radar for Target this is known as stepped-frequency (SF) radar. In Doppler radar, the change in frequency between the transmitted and returns signal is used to For a frequency step size of 10MHz, the maximum unambiguous range is m ft m f c R 15 50File Size: KB.equation .
This provides an indication as to the sensitivity of the system and is the first step in any radar design. Range resolution is also a most important parameter in any radar system and this is determined by the nature of the waveform. Typically range resolution needs to be high enough toFile Size: KB.Radar Functions • Normal radar functions: 1.
range (from pulse delay) 2. velocity (from Doppler frequency shift) 3. angular direction (from antenna pointing) • Signature analysis and inverse scattering: 4. target size (from magnitude of return) 5. target shape and components (return as a function of direction) 6.
moving parts (modulation of.