Hayden’s practice has evolved over the years to concentrate on challenging multidisciplinary projects.  These are a few recent examples:
 
Single-coax bidirectional multi-rate telemetry system for underwater sonar

Purpose: Characterize, equalize, and maximize bandwidth of ship-installed sonar tow cable system

Accommodates coaxial cable length up to 15km or data rate up to 15Mbps.

Performs full cable equalization and connection at maximum reliable data rate in two seconds.

Automatically assigns best uplink data rate over six-octave range.

Optimally packs maximum possible channel-oriented packets into available data rate.

Executes full acquisition system reconfiguration in two seconds.

Presents a la carte operator menu to optimally allocate available bandwidth.

Maintains acquisition system time reference within 100us of GPS at all times.

Requires no supervisory microprocessor at acquisition system end - permitting sample-synchronous data processing for clean signal acquisition.


Flexible, high performance underwater sonar data acquisition system

Extreme modularity and scalability, from 8 to 512 RX channels, 4 to 16 TX channels, copper or fiber telemetry uplink, individual 64-channel RX modules separable from system up to 100 meters while still
phase-coherent with the system, optional tow body attitude control, plus significant  uncommitted expansion capability.

The frequency of each digital-heterodyne receiver can be programmed individually or collectively, with up to four programmable frequency hops per ping.  Each channel also includes linear FM pulse compression.

Receivers exceed 120dB SNR in 24KHz bands from 100KHz to 900KHz.  This meets the theoretical maximum SNR of the ADC converters.

Entire system configured with sufficient signal isolation to permit kilowatt transmitters and thermal-noise-level receivers to run at the same time without crosstalk.

Systolic data compression algorithm operates at up to 8:1 compression ratio with fixed latency.

Built-in-test at every stage of signal path, plus end-to-end BIT with 100% coverage from acoustic receiver elements to user display.

 

Low-cost, low-power sonar system to provide industry-leading sonar capability in small UUVs

Parametric chirp-FM transmitter and receiver control for command-based reconfiguration at a variety of bandwidths at operating frequencies from 150KHz to 1800KHz.

Wide-band signal processing providing unprecedented image clarity and range in an inexpensive system.

Receiver channels are individually digitized, then processed in a single FPGA with command-configurable combinations of multi-rate decimating filters, pulse compression filters, and other filters to permit a single low-cost sonar “engine” to be used in numerous systems - from a minimum-cost single-frequency  side scan system, to dual-frequency-simultaneous side-scan systems with interferometric bathymery.

Complete system consumes less than 25 watts, facilitating extended missions despite limited battery capacity of small UUVs.