Patent ID: 9658321
Date: 2017-05-23
CPC Classifications: G01S

Claim:
1. A radar system for estimating range, range rate (velocity) and bearing angles of one or more targets or objects reflecting at least one transmitted RF signal, the radar system comprising: a transmitter for transmitting the at least one transmitted RF signal, the transmitted signal changing in frequency during each sweep made by the radar system, the transmitter making K sweeps per acquisition and each sweep having Q frequency shifts per sweep; an array of N antenna elements for receiving the at least one RF signal; an array of single bit modulators, each single bit modulator in said array of single bit modulators being coupled with a corresponding antenna element or with a corresponding subgroup of said antenna elements in said array of antenna elements for modulating signals from the corresponding antenna elements according to a multibit code, wherein the number unique codes from which said mutibit code is selected is equal to N, with N unique codes being repeated Q·K times during each acquisition; a mixer; a summation network for applying a summation of signals from the array of single bit modulators to said mixer, the mixer outputting in-phase and quadrature output signals; one or more analog to digital converters for detecting and converting in-phase and quadrature output signals from the mixer to corresponding digital signals; means for applying S signal masks to the corresponding digital signals to thereby generate S different masked versions of the corresponding digital signals; means for summing said S different masked versions of the corresponding digital signals to produced summed versions thereof; and means for performing a two dimensional FFT processing of the summed versions of the S different masked versions of the corresponding digital signals, to estimate the range, range rate (velocity) and bearing angles of said one or more targets or objects.