The invention discloses a bistatic MIMO radar space maneuvering target tracking method capable of realizing accurate estimation and prediction of motion parameters such as the three-dimensional position and speed of space maneuvering targets. According to the method, a bistatic MIMO radar uniform circular array system is applied to space maneuvering target tracking, based on bistatic MIMO radar uniform circular array angle Doppler frequency estimation and the target state space, a measuring equation is established in a measuring right angle coordinate system for emitting and receiving uniform circular arrays according to a function relation between measuring elements and target motion state variables. A current statistics model applicable to maneuvering target tracking is employed to establish a state equation for describing the evolution of target motion parameters with time, the unscented Kalman filter algorithm applicable to nonlinear state filtering is employed to estimate the target motion parameters in real time, the target motion parameters can be predicted, and the tracking of the space maneuvering target is realized.

Bistatic MIMO radar space maneuvering target tracking method

A blind spot detection system for a motorcycle, which includes an accelerometer, a gyroscope, and a detection device for detecting the presence of a vehicle in at least one blind spot. The accelerometer detects a gravity force vector, and the gyroscope detects the position of the motorcycle relative to the gravity force vector such that a lean angle of the motorcycle is calculated. The detection device is then configured to maintain the same position of the motorcycle relative to the gravity force vector and compensate for the position of the motorcycle if the lean angle is greater or less than 90°, such that the detection device is able to detect the presence of the vehicle in the at least one blind spot, independent of the lean angle of the motorcycle.

Motorcycle blind spot detection system and rear collision alert using mechanically aligned radar

The invention discloses a MIMO radar space maneuvering object tracking method based on a receiving linear array. According to the method, constraints on slow motion or stillness of objects are removed, and at the same time, three angles and an object Doppler frequency are estimated; and the three angles and Doppler frequency information are fully utilized so as to improve the object tracking precision. A double-base MIMO radar is configured in such a way that an emission array is a uniform circular array and a receiving array is a uniform linear array, by use of an angle Doppler combined estimation method, an azimuth and a pitch angle of a radar object relative to the emission array, a receiving angle of the radar object relative to the receiving array and a normalization Doppler frequency of the radar object are estimated, then a measuring equation between the azimuth, the pitch angle, the receiving angle and a normalization Doppler frequency measuring element of the radar object and an object motion parameter are established, a state equation of the object is established by use of a "current" statistical model, motion parameters of the object are estimated and predicted by use of an unscented Kalman filtering algorithm, and thus the object is tracked.

MIMO radar space maneuvering object tracking method based on receiving linear array

FIELD: radar; data processing.SUBSTANCE: invention relates to secondary digital processing of radar signals and can be used in a radar station (RS) for generating, when an aerial target (AT) is accompanied from a class "aircraft with a turbojet engine", reliable identification of combined or separate effects of distance and speed withdrawing interference or their absence. Method consists in identification of combined or separate effect of distance and speed withdrawing interference or its absence with simultaneous formation of reliable unconditional estimates of range to AT and speed of approach of RS carrier to AT at integration of RS information and an indicator of the effect of withdrawing interference, taking into account the a priori data on the change of these versions and adaptation of the observation system to them based on the narrow-band Doppler filtration of the signal reflected from the target using a fast Fourier transformation procedure, generation of readings of Doppler frequencies caused by reflections of signal from airframe and blades of impeller of first stage of low pressure compressor of power plant AT, processing of generated Doppler frequency readings and output indications of the effect of withdrawing interference in multiturn filter of combined tracking of AT and first compressor component of signal spectrum, functioning in accordance with procedure of quasi-optimal combined filtration of phase coordinates and recognition of state of mark structure of linear stochastic dynamic system, operating on the basis of a priori data in the form of a mathematical model of the "AT – RS – indicator" system with a random step-like structure, including linear dynamics models of radial functionally related coordinates of mutual movement of the RS and AT carrier, their measurements in the radar station, changing the version of the effect of escaping noise, indicator of the effect of withdrawing noise, uncontrolled random disturbances and noise under initial conditions. At the output of the multichannel filter estimates of the version of the effect of withdrawing noise, unconditional mathematical expectation of functionally related coordinates of mutual movement of the AT and the RS carrier are formed with combined or separate effect of distance and speed withdrawing interference or in the absence of such action, and unconditional covariance matrix of their estimation errors.EFFECT: high reliability of identifying joint or separate interference of range-capturing interference and estimating range to AT and rate of convergence of carrier RS with AT.1 cl, 1 dwg

Method of tracking an aerial target in a radar station from a class of "aircraft with turbojet engine" under action of distance and speed withdrawing interference

The invention discloses a multi-aircraft collaborative defense penetration trajectory optimization design method, which comprises the steps of obtaining a single-aircraft three-degree-of-freedom kinetic model, and establishing a multi-aircraft three-degree-of-freedom kinetic model; acquiring RCS data of the single aircraft for the radar, and calculating a radar detection threat value of each single aircraft according to the distance between the single aircraft and the radar and the RCS data; obtaining radar detection threat values of multiple aircrafts according to the radar detection threat value of the single aircraft; and obtaining constraint conditions, and optimizing the multi-flight cooperative defense penetration trajectory according to the multi-aircraft three-degree-of-freedom kinetic model, the radar detection threat values of the multiple aircrafts and the constraint conditions. The method provided by the invention not only considers the influence of the distance factor between the aircraft and the radar, but also considers the relationship between the RCS and the attitude of the aircraft; meanwhile, the method does not need to carry out small-angle assumption and linearization processing on the equation, and the multi-aircraft cooperative trajectory error under the conditions of long distance, wide airspace and wide speed domain is small.

Multi-aircraft collaborative defense penetration trajectory optimization design method

A radar system for detecting and tracking at least one target utilizing a mechanically rotated two-dimensional radar antenna system with a fan-shaped beam arrangeable on a non-stable radar platform. The radar system includes a tracking filter configured to estimate an azimuth angle of the at least one target with respect to a fixed reference coordinate system based on: azimuth angle information of at least one target radar return signal measured utilizing the radar antenna system with respect to a local coordinate system of the radar platform, and radar platform relative orientation with respect to the fixed reference coordinate system at the time of the at least one target radar return signal, such that a software-based motion-compensation of the radar platform is provided.

Radar system and method for detecting and tracking a target

The invention relates to a method for operating a pulsed radar system, wherein the pulsed radar system comprises a transmitting antenna, configured to transmit transmission signals, a receiving antenna, configured to receive reflected signals and a signal generating means, configured to generate transmission signals. The method comprises the steps of generating a first transmission signal at a first centre frequency, generating a second transmission signal at a second centre frequency and transmitting the first and the second transmission signals during a predefined transmission time window. The first transmission signal is significantly longer than the second transmission signal. The transmission of the second transmission signal starts during or at the end of the transmission of the first transmission signal and ends essentially at the end of the transmission time window. When the first and/or second transmission signal hits a target a first reflected signal and/or a second reflected signal is generated, wherein the centre frequency of the first reflected signal correlate to the centre frequency of the first transmission signal and the centre frequency of the second reflected signal correlate to the centre frequency of the second transmission signal, and wherein the method further comprises the method step of receiving the first and/or second reflected signal.

Pulsed radar system and method of operating a pulsed radar system

본 발명은 펄스 레이더 시스템을 작동시키기 위한 방법에 관한 것으로, 상기 펄스 레이더 시스템은 전송 신호를 전송하도록 구성된 전송 안테나, 반사 신호를 수신하도록 구성된 수신 안테나 및 전송 신호를 생성하도록 구성된 신호 생성 수단을 포함한다. 상기 방법은 제1 중심 주파수에서 제1 전송 신호를 생성하는 단계, 제2 중심 주파수에서 제2 전송 신호를 생성하는 단계 및 예정된 전송 시간 윈도우 동안 제1 및 제2 전송 신호를 전송하는 단계를 포함한다. 상기 제1 전송 신호는 상기 제2 전송 신호보다 크게 길다. 상기 제2 전송 신호의 전송은 상기 제1 전송 신호의 전송 동안 또는 끝에서 시작되고, 상기 전송 시간 윈도우의 종료에서 본질적으로 종료된다. 상기 제1 및/또는 제2 전송 신호가 타겟을 맞히는 경우 제1 반사 신호 및/또는 제2 반사 신호가 생성되고, 상기 제1 반사 신호의 중심 주파수는 상기 제1 전송 신호의 중심 주파수와 서로 관련되고, 상기 제2 반사 신호의 중심 주파수는 상기 제2 전송 신호의 중심 주파수와 서로 관련되며, 상기 방법은 상기 제1 및/또는 제2 반사 신호를 수신한느 단계를 추가로 포함한다.

Anders Silander

Papers

Radar system and method for detecting and tracking a target

Pulsed radar system and method of operating a pulsed radar system

펄스 레이더 시스템 및 펄스 레이더 시스템의 작동 방법