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Dynamic spectrum allocation is becoming a means of allocating spectrum based on users and available frequencies in surrounding geographic regions. Presently, spectral masks are applied to radar transmission based on specifications from governmental regulatory agencies. This paper describes a concept for dynamic spectral mask determination based on the location and acceptable interference power levels...
Digital array radars (DAR) with element-level digital transmission and reception present new opportunities for more advanced radar functionality and performance. In order to reduce RF front-end complexity while also reducing the need for high sample rates, the analog IQ demodulation receiver, or homodyne, is proposed so that only a single local oscillator (LO) is needed per element. An important homodyne...
In a preceding paper a multi-channel test signal generator for UHF radar applications was presented. The present contribution shows the application of this generator to test the performance of multi-channel receivers in selected scenarios. Exemplary measurement results are presented showing the usable dynamic range and the maximum packet reception rate for a secondary surveillance radar receiver and...
Quality of detection systems using matching Altering particularly depends on signals correlation characteristics. Resolution, maximum range and noise characteristic of radar based on such characteristics of correlation function as main lobe width, main lobe level and side-lobe level. It is necessary to research the influence of receiver non-linear amplifier mode to BPSK signal correlation characteristics...
This paper presents a waveform selection criterion for the purpose of low probability of interception (LPI). As various signal processing methods can be employed by channelized receivers, here we use the obtained amount of information from a specific transmitted waveform in interceptors to describe the LPI performance of the transmitted waveform. In this paper, the Shannon entropies of the received...
Waveform parameter agility is one of the effective approaches in improving the low probability of identification (LPID) performance for airborne radar. In this paper, we employ the identification capacity theory to investigate the design criterion of a set of available hopping frequencies with uniform distribution, including the designment of optimal frequency number and frequency interval. Firstly,...
A fully integrated 35GHz linearly Frequency Modulated Continuous Wave (FMCW) single-chip radar transceiver is successfully implemented in 65nm standard CMOS process. The single-chip transceiver is configured in one transmitter and two receivers and includes a wideband process-oriented optimized QVCO, a mm-Wave power amplifier, low noise amplifiers, low noise passive mixers, IF amplifiers as well as...
Utilizing the time differences of arrival of a signal, impinging on a distributed sensor network, is a well known approach for the location estimation of a radio wave emitter. The high sampling rate necessary for a precise positioning implies a huge amount of data exchange between the sensor nodes. Contrary, the absence of high data rate enabled backbone links, connecting the nodes, restricts the...
We introduce a novel sparse signal detection algorithm, whose goal is to localize an unknown number of fluctuating targets in a sparse scenario, for example composed by N target sites. Rather than probing each cell with standard detection techniques, we employ an adaptive, step-by-step, tree-structured algorithm, that iteratively narrows the set of possible candidate locations. More specifically,...
Noise power and noise figure are detailedly analysed and deduced in theory for mult-port network in active electrically scanned array(AESA) radar, especially in AESA radar. Mathematical expressions of output noise power and total noise figure of network are given out under various conditions. Accordingly, this provides a basis of theories for multi-port network and radar receiver system design, the...
Resolving radar signal ambiguities in digital radio frequency receivers using traditional identification (ID) techniques remains challenging. Parametric comparison of common received signal features such as radio frequency, pulse width, pulse repetition interval and angle-of-arrival can lead to either 1) multiple emitters producing a single ID, or 2) a single emitter producing multiple IDs. This work...
This paper describes a 24 GHz CMOS RF transceiver for radar sensor applications. The transceiver is composed of four receivers, one transmitter with a power amplifier, a VCO, LDOs and an digital controller. The transceiver is fabricated in 0.13-um RF CMOS process, occupying 2.4 mm × 2.4 mm. The measured receiver gain is 35 dB and noise figure is 5.3 dB. The measured VCO phase noise is −108dBc/Hz at...
Array radar interchannel mismatch may seriously degrade the performance of the array signal processing unless some form of compensation is employed. The compensation can be achieved by means of equalizer. Coefficients of equalizer can be solved by the least-squares theory. This paper introduces convex optimization to enhance the performance of equalizer. Simulation results show that convex optimization...
In Electronic Support, a receiver must monitor a wide frequency spectrum in which threatening emitters operate. A common approach is to use sensors with high sensitivity but a narrow bandwidth. To maintain surveillance over the whole spectrum, the sensor has to sweep between frequency bands but requires a scanning strategy. Search strategies are usually designed prior to the mission using an approximate...
A K-band UWB quadrature receiver with a precision rectifier for non-coherent detection of pulses is implemented in 90 nm CMOS. The LNA topology is a Common Gate - Common Source topology followed by a double-balanced Gilbert mixer for down conversion. Without the rectifier the measured peak conversion gain is 10 dB with a –3 dB bandwidth of 4.4 GHz and a NF of 15 dB consuming 50 mA. To rectify the...
We present the realization of a cooperative radar system for ranging applications with integrated data-transmission capability. The simultaneous transmission is performed by the radar-hardware without the necessity of additional components or an auxiliary data-link. Therefore the data is directly embedded in the transmitted chirp of a frequency-modulated continuous-wave radar-sensor. A second station,...
In this paper, a zero-IF radar architecture is presented. An agile prototyping environment is shown, based on the capabilities of modern instrumentation complemented by COTS components and minimal custom circuitry. Receiver sensitivity improvements based on the oversampling and antipodal modulation techniques are described.
We discuss sparse and compact phased array antenna architectures based on the use of multiple transmit antennas in order to reduce the number of needed receiver channels. We also present the design of a sparse and compact phased array antenna together with measurement results of a scene containing a car and some corner reflectors to verify the theoretical study. The sparse and compact array architectures...
Radar and radio receivers must be capable of surviving high power incident signals without incurring damage to power sensitive components while allowing the receiver to function under normal operating conditions. In this investigation a FET based two stage limiter with a threshold detector was designed and manufactured on a 0.5 um pHEMT GaAs process. The electrical requirements over a 4 GHz to 11...
Due to the diverse and complex tasks for the formation, many different radio communication equipment are densely deployed on board, leading to the coexistence among different equipment a big problem. Therefore, this paper has proposed an interference analysis algorithm for communication and radar systems and developed a link level simulation system to solve the coexistence problem between radar and...
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