RADAR SYSTEM

• US 3,599,208 A
• Filed: 04/25/1969
• Issued: 08/10/1971
• Est. Priority Date: 04/25/1969
• Status: Expired due to Term

• Current Assignee: Robert P. Nelson
• Original Assignee: Robert P. Nelson
• Inventors: Nelson, Robert P.
• Application Number:
  US04/819,309
• Time in Patent Office: 837 Days
• US Class Current: 342/92
• CPC Class Codes: G01S 13/4445 amplitude comparisons monopulse, i.e. comparing the echo signals received by an antenna arrangement with overlapping squinted beams
• CPC Class Codes: G01S 7/414 Discriminating targets with respect to background clutter

Abstract

The invention relates to a radar system for enhancing the reception of desired echoes by the elimination of background clutter. The system comprises a monopulse radar system provided with a quadrature error detector wherein the magnitude of the quadrature error signal is used to control the gain or sensitivity of the monopulse receiver.

Claims

1. A radar system for enhancing the reception of desired echoes comprising input means for receiving both desired and undesired signals;

a microwave comparator coupled to the input means for establishing sum and difference signals;

a sum signal receiver connected to the comparator for amplifying the sum signal;

a difference signal receiver connected to the comparator for amplifying the difference signals;

a sum signal detector coupled to the sum signal receiver;

a quadrature difference phase detector connected to the sum signal receiver and to the difference receiver; and

a gate circuit coupled to the quadrature difference phase detector and to the sum signal detector.

2. The system of claim 1 wherein the sum signal receiver and the difference signal receiver contain mixer, preamp, variable attenuator and IF circuits.

3. The system of claim 2 further including a feedback circuit from the quadrature difference phase detector to both variable attenuators in both receivers.

4. The system of claim 3 further including a quadrature difference gate generator connected to the quadrature difference phase detector and the gate circuit to control the operation of the operation of the gate circuit.

5. The system of claim 4 further including a quadrature difference threshold coupled between the quadrature difference phase detector and the gate generator for setting the operating point of the generator and therefore the gate circuit.