Miniaturized GPS Antenna Array using High Dialectric Materials

Period of Performance: 04/27/1998 - 04/26/2000


Phase 2 SBIR

Recipient Firm

Navsys Corp.
14960 Woodcarver Road Array
Colorado Springs, CO 80921
Principal Investigator

Research Topics


The low power of the GPS satellite makes transmitted signals particularly susceptible to jamming. The best anti-jamming (A/J) performance demonstrated with a GPS receiver to date has been through the use of beam steering and null forming. Adaptive nulling electronics have been designed that can support J/S margins of up to 98 dB. Further jamming resistance can be obtained with a high grain antenna, as achieved with an antenna array with a large number of elements. Because of physical size limitations, the use of antenna arrays has been restricted, to date, to large vehicles such as aircraft. There is widespread interest in using GPS on small "smart" munitions, which have been demonstrated to be highly effective in programs such as JDAM and LOCAAS. In this proposal, an innovative high-grain antenna array is proposed that will reduce the array size using high-dielectric materials. Under a previous Phase I contract, a miniaturized 4-element (planar 2x2) antenna array was designed, developed, and tested that could be packaged in a 6"x6" form factor. Under the proposed Phase II contract work, a 5-element cross array that can be packaged in the same space factor will be designed, developed and tested. This miniaturized array will be designed to be suitable for integration with existing beam steering and null forming A/J electronics. The proposed research effort will respond to the overall objectives of ONR by providing a small GPS antenna array suitable for use on miniature munitions to provide A/J protection.