Einzeltreffer — DigiBib

Passive radar system and method of detection of low-profile low altitude targets based on application of Low Earth Orbit (LEO) and Very Low Earth Orbit (VLEO) satellites signals. Staring array of directional antennas cover entire sky and provide continuous illumination (receiving reflected satellite signals) from multiple targets for fast detection, recognition and targets tracking and increasing detection range. Coupling of each directional antenna with separate receiver cannel allows fast continuous process of information from all targets simultaneously. Monopulse processing of signals from reference sub-set of antennas with overlap antenna patterns provides highest directing accuracy and better clutter/noise and media influence suppression. Directional antenna array does not need beam forming module. System has small weight, size, may be portable or mounted on light vehicle or small drone because small size and weight.

Titel:	PASSIVE RADAR SYSTEM FOR DETECTION OF LOW-PROFILE LOW ALTITUDE TARGETS
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2024
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20240134027 Publication Date: April 25, 2024 Appl. No: 17/971582 Application Filed: October 21, 2022 Claim: 1. Passive radar system based on application of Low Earth Orbit (LEO) and Very Low Earth Orbit (VLEO) satellites signals for detection of low-profile low altitude targets wherein the radar receiver comprising at least one array of antenna elements and at least one processing stage adapted to process signals received via each antenna element of said array wherein: each directional antenna coupled with separate processing stage providing fast continuous parallel processing of information from all targets simultaneously; antenna patterns of said directional antennas overlap in one or more said array of antenna elements arranged as staring array of directional antennas covering entire sky or area of observation and provide simultaneous continuous illumination (receiving reflected satellite signals) of multiple targets; directions for creating monopulse subarrays, where signals from reference antennas providing highest directing accuracy and better clutter/noise and media influence suppression; each said processing stage comprising receiving chain with signal conditioning circuit including voltage or current limiters, anti-aliasing circuits, Automatic Gain Control (AGC) means, analog-to-digital converter and connected by digital interface to signal processor and feed network; each said monopulse subarray comprising of monopulse processor for simultaneous one or multi-axis processing of all signals in receiving chains as ratio of amplitudes and/or phase shift of signals for direction finding and one-iteration adapting for clutter suppressing or decrease transferring media influence to receiving chain parameters by phase shift in subarray of neighboring directional antennas with overlap antenna patterns; feed network connected by digital interface arranged as universal serial bus (USB) or microwave and/or fiber optic waveguides to signal processor with memory for storing executable instructions and for separate processing of amplitudes, phases, frequency components shift of signals in receiving chains; all said processing stages comprising receiving chains, monopulse processors and signal processor connected with synchronization means by digital interface. Claim: 2. Passive radar system of claim 1, wherein said array of antenna elements arranged as concave, convex, cylindric full/hemi sphere modules consisting of plurality of antenna elements which forming directional antennas. Claim: 3. Passive radar system of claim 1, wherein said directional antennas arranged as separate antennas or formed as subarray of antenna elements arranged on substrate surface, in volume of substrate or combined. Claim: 4. Passive radar system of claim 1, wherein said processing stages consisting receiving circuits and signal processor are arranged for simultaneous transmitting, receiving, and processing signals on a few different frequencies (multi-frequency signals) and comprising corresponding arranged directional antennas, anti-aliasing circuits and filtering means in each transmitter and receiving chain. Claim: 5. Passive radar system of claim 1, wherein said processing stages consisting receiving circuits and signal processor are arranged for simultaneous transmitting, receiving, and processing different modes signals, such as communication, navigation, control (multi-mode, multi-function signals) and comprising corresponding arranged directional antennas, anti-aliasing circuits and filtering means in each transmitter and receiving chain. Claim: 6. Passive radar system of claim 1, wherein said processing stages consisting receiving circuits and signal processor are arranged for simultaneous processing received signals for detection direction of arriving for jam and/or spoof signals and comprising corresponding arranged analog and digital filtering means in each receiving chain and signal processor. Claim: 7. Passive radar system based on application of Low Earth Orbit (LEO) and Very Low Earth Orbit (VLEO) satellites signals for detection of low-profile low altitude targets wherein the radar receiver comprising at least one array of antenna elements and at least one processing stage adapted to process signals received via each antenna element of said array wherein: said array of antenna elements arranged as staring array of directional antennas covering entire sky and provide simultaneous continuous illumination (receiving reflected satellite signals) of multiple targets; each directional antenna coupled with separate processing stage providing fast continuous parallel process of information from all targets simultaneously; antenna patterns of said directional antennas overlap in one or more directions for creating monopulse subarrays, where signals from reference antennas providing highest directing accuracy and better clutter/noise and media influence suppression; each said processing stage comprising receiving chain with separate software defined radio (SDR) via signal conditioning circuit including voltage or current limiters, anti-aliasing circuits, Automatic Gain Control (AGC) means and connected by digital interface to signal processor and feed network; said signal processor comprising of monopulse processor for simultaneous multi-axis processing of all signals in receiving chains as ratio of amplitudes and/or phase shift of signals relative to signals in reference antenna sub-array coupled with receiving chain for direction finding and one-iteration adapting to decrease transferring media influence to receiving chain parameters by phase shift in subarray of neighboring directional antennas with overlap antenna patterns; feed network connected by digital interface arranged as universal serial bus (USB) or microwave and/or fiber optic waveguides to signal processor with memory for storing executable instructions and for separate processing of amplitudes, phases, frequency components shift of signals in receiving chains; all said processing stages comprising receiving chains, monopulse processor and signal processor connected with synchronization means by digital interface. Claim: 8. Passive radar system based on application of Low Earth Orbit (LEO) and Very Low Earth Orbit (VLEO) satellites signals for detection of low-profile low altitude targets wherein the radar receiver comprising at least one array of antenna elements and at least one processing stage adapted to process signals received via each antenna element of said array wherein for fast targets signals processing: said array of antenna elements arranged as staring array of directional antennas covering entire sky and provide simultaneous continuous illumination (receiving reflected satellite signals) of multiple targets; each directional antenna coupled with separate processing stage providing fast continuous parallel process of information from all targets simultaneously; antenna patterns of said directional antennas overlap in one or more directions for creating monopulse subarrays, where signals from reference antennas providing highest directing accuracy and better clutter/noise and media influence suppression; each said processing stage comprising receiving chain with signal conditioning circuit including voltage or current limiters, anti-aliasing circuits, Automatic Gain Control (AGC) means and connected to Field-Programmable Gate Array (FPGA) and to actuator control; each said monopulse subarray comprising of FPGA for simultaneous one or multi-axis processing of all signals in receiving chains as ratio of amplitudes and/or phase shift of signals for direction finding and one-iteration adapting for clutter suppressing or decrease transferring media influence to receiving chain parameters by phase shift in subarray of neighboring directional antennas with overlap antenna patterns; each said monopulse subarray connected by digital interface arranged as universal serial bus (USB) or microwave and/or fiber optic waveguides directly to actuator control for fast control of alarm, display, communication or executive means; all said processing stages comprising receiving chains, monopulse processor and signal processor connected with synchronization means. Current International Class: 01; 01

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PASSIVE RADAR SYSTEM FOR DETECTION OF LOW-PROFILE LOW ALTITUDE TARGETS