SBIR-STTR Award

An innovative, integrated analog and digital mitigation solution which will enable HF radio receivers to fully operate while in the presence of interference. The solution is centered on a nonlinear AJ technology patented by GIRD Systems’ staff that is directly applicable to the interference/jamming problem of interest, with an initial-design prototype available for a Phase I demonstration with HF radios. Simulations and initial laboratory prototypes have demonstrated up to 49 dB of wideband interference suppression while protecting the ADC by limiting impinging RF power. Use of this approach obviates the need for exotic GaN LNAs and high linearity ADCs. The proposed concept is well-suited for deployment both as a near-term external appliqué solution to existing HF radios (Figure 1), as well as integrated into future HF radios.

The Army is seeking through this STTR program to develop high-dynamic-range, high-power-handling, and high-survivability high frequency (HF) radio receivers with significant enhancement in intrinsic interference and jamming resistance. GIRD Systems is addressing this need with a novel interference mitigation (IM) technology which is inherently a wideband active device that 1) limits input power to the receiver, and 2) reduces or eliminates RFI power in the communication band. The device can perform IM on continuous wave (CW), frequency modulation (FM), and phase modulation (PM) interference, as well as mitigate interference in adjacent channels and even on interference spectra that completely overlap the signal of interest (SOI). It exhibits sub-nanosecond latency, zero tracking error with respect to frequency or phase, and zero tuning time between frequencies within the band of operation.