Abstract: The personal computer based integrated radar acquisition (PIRAQ) system integrates a programmable timing generator, a digital Intermediate Frequency (IF) processor, and a digital signal processor on a standardized personal computer "add-on" electronic circuit module that accepts standard IF input and produces standard radar display outputs. The digital intermediate frequency processor includes an IF pre-processor, a programmable digital matched filter, and a wide dynamic range digital baseband converter. Implementing the PIRAQ system in digital components on a single electronic circuit module for use in a personal computer provides and efficient, low-cost, portable, and programmable high-performance radar acquisition system hardware base from which radar signals can be digitally processed.

Abstract: A multiple-Doppler radar network can be constructed using only one, traditional, transmitting pencil-beam radar and one or more passive, non-transmitting receiving sites. Radiation scattered from the pencil beam of the transmitting radar as it penetrates weather targets can be detected at the receive-only sites as well as at the transmitter. In a bistatic system, the location of targets in Cartesian space can be calculated from the pointing angle of the transmitting antenna and the time between transmission of a radar pulse from the transmitter and detection at a passive receiver site.

Abstract: This amplifier is equipped with a digital bias control apparatus to provide precise, dynamic control over the operating point of a plurality of amplifying elements in the ampliifer. A processor optimizes the operating point of each individual amplifying element as a function of the amplifying element characteristics, the operating environment and the applied input signal. The use of a processor also enables the user to remotely program the operating point of each individual amplifying element in the amplifier. The processor further enables dynamic changes in the operating characteristics of the amplifier as the operating environment of these amplifing elements changes. The processor also generates an alarm signal if any particular amplifying element is operating out of its nominal specifications. This digital bias control apparatus can function in class A, AB, B or C type of amplifiers whether they are tuned or untuned and whether the amplifier operates in a pulsed or continuous mode.