Bistatic radar system专利检索-阵列波导光栅电子零件及设备专利检索查询-专利查询网

Bistatic radar system

阅读：48发布：2022-02-19

专利汇可以提供Bistatic radar system专利检索，专利查询，专利分析的服务。并且A bistatic radar system using separate antennas for transmit and receive and taking advantage of the fact that the net radar resolution depends on the product of the two gain patterns. In one illustrated system of the invention, a low resolution transmitter pattern is combined with an ambiguous high resolution receiver pattern formed of a thinned array of phase controlled radiating elements. The elements are separated by a distance greater than the wavelength of the RF signal. In this thinned array approach, the suppressed receive grating lobes may be placed at alternate nulls of the transmit pattern by spacing the receiver array elements to be approximately one-half the transmitted antenna width. The transmit radar forms a conventional sector scanning antenna pattern that illuminates the forward area and the receiving antenna has elements spaced so they form a multilobe pattern that contains selected spacing of grating lobes. In operation only one of these grating lobes is illuminated by the transmit pattern. The transmit and receive antennas are scanned in synchronism either sequentially or in some jump scan sequence to provide the sector scan display. The system is operable substantially without microwave waveguides along the thinned array by providing a local oscillator signal that is phase shifted to control the antenna pointing.，下面是Bistatic radar system专利的具体信息内容。

权利要求

1. A bistatic radar system comprising: a transmit antenna having a single main lobe; an extended receive antenna having a plurality of receive antenna elements so as to form a thinned array with spacing between said antenna elements such that the grating lobes thus derived appear substantially at the nulls of said transmit antenna pattern; a plurality of radar receiver mixers each responsive to signals received by one of said plurality of antenna elements; a plurality of phase shifters each supplying a phase shifted local oscillator signal to each of said radar receiver mixers; a plurality of intermediate frequency preamplifiers each responsive to signals from said plurality of radar receiver mixers; a corporate feed supplying said local oscillator signal to each of said phase shifters; and means coupled between said transmit and receive antenna for synchronizing the pointing directions thereof.

2. The combination of claim 1 wherein said corporate feed supplying said local oscillator signal to each of said phase shifters is constructed of coaxial cable.

3. The combination of claim 1 including local oscillator means and a plurality of phase shifters and mixers with a mixer coupled to each antenna element and a phase shifter coupled between said local oscillator means and each mixer, and including means to control the phase of saiD plurality of phase shifters.

4. A bistatic radar system comprising: a transmit antenna having a single main lobe; a thinned array receive antenna including a plurality of sub groups of equal numbers of antenna elements; a plurality of radar receiver mixers each coupled to one of said antenna elements; a plurality of intermediate frequency preamplifiers each coupled between one of said radar receiver mixers and a line common to one of said sub groups; a plurality of phase shifters each coupled to one of said radar receiver mixers; a corporate feed supplying a singal from a local oscillator to each of said plurality of phase shifters; and a plurality of time delay circuits each responsive to signals appearing on a line common to one of said sub groups and the antenna scan angle.

5. The combination of claim 4 wherein said corporate feed supplying a signal from a local oscillator to each of said plurality of phase shifters is constructed of coaxial cable.

6. The combination of claim 4 wherein said time delay circuits include a plurality of time delay elements coupled through a plurality of switches, said switches being energized as a function of the scan angle of the antenna.

7. A bistatic radar system comprising: a phase scanned receive array having a plurality of spaced radiating elements; a mechanical scan transmit antenna formed of a parabolic dish having a diameter greater than the spacing between any adjacent two of said plurality of spaced radiating elements; and transmitting and receiving means coupled to said receive array and said transmit antenna including means for synchronizing the pointing of said receive array and transmit antenna.

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