Pulse radar detection system
First Claim
1. A transmitter for a high resolution radar system, comprising:
- a microwave oscillator for providing at an output a continuous wave signal at a predetermined frequency, a pulse-former having an input coupled to said output of said oscillator and a first and a second switchable output whereby said oscillator signal can be applied to either output according to a control signal applied to a control terminal of said pulse-former, a switch driver having an output coupled to said control terminal of said pulse-former and operative to selectively switch said output of said pulse-former between said first and second outputs to provide at said first output a pulse comprising a number of said oscillator cycles indicative of a desired pulse to pulse interval and selected according to a range gated time delay, a bi-phase modulator having an input coupled to said first output of said pulse-former to provide at an output a bi-phase modulated signal, and an antenna coupled to said output of said bi-phase modulator for transmitting said bi-phase modulated signal according to a selected object range.
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Accused Products
Abstract
A radar based sensor detection system comprises a microwave source operative to provide a continuous wave signal at an output. A pulse-former is coupled to the output of the source and is operative to provide at an output a variable length pulse that increases the transmitted energy of the radar system according to the range of object detection. A modulator is coupled to the output of the pulse-former for providing a modulated pulse signal. A transmit receive switch coupled to the output of the modulator is selectively operative between a first transmit position and a second receive position. A transmit channel coupled to the transmit receive switch transmits the pulse signal when the switch is operated in the transmit position. A receiving channel coupled to the transmit receive switch receives the modulator signal when the switch is operated in the receive position. First and second voltage multipliers each have a local oscillator input for receiving the modulator signal in the receive position, and each have an input signal port, and an output port. A receiver channel receives a reflected transmitted signal from an output and applies the received signal to the receive signal input ports of the voltage multipliers. An autocorrelator coupled to the output ports of the voltage multipliers correlates the received signal to produce an output signal indicating the detection and position of the object.
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Citations
20 Claims
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1. A transmitter for a high resolution radar system, comprising:
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a microwave oscillator for providing at an output a continuous wave signal at a predetermined frequency, a pulse-former having an input coupled to said output of said oscillator and a first and a second switchable output whereby said oscillator signal can be applied to either output according to a control signal applied to a control terminal of said pulse-former, a switch driver having an output coupled to said control terminal of said pulse-former and operative to selectively switch said output of said pulse-former between said first and second outputs to provide at said first output a pulse comprising a number of said oscillator cycles indicative of a desired pulse to pulse interval and selected according to a range gated time delay, a bi-phase modulator having an input coupled to said first output of said pulse-former to provide at an output a bi-phase modulated signal, and an antenna coupled to said output of said bi-phase modulator for transmitting said bi-phase modulated signal according to a selected object range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver for a high resolution radar of the type having a transmitter for transmitting a phase coded pulse compression signal, comprising:
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a receive antenna capable of receiving a reflected signal from an object positioned to interrupt said transmitted signal and intercept a portion of said signal to said receiver antenna to provide said signal at an output, first and second voltage multipliers, each having a local oscillator input port and a receive signal input port and each having an output port, said receive antenna output coupled to said receiver input port of said first and second multipliers, a microwave oscillator synchronized to said transmitter signal to provide at an output a continuous wave signal at a predetermined frequency, a pulse-former having an input coupled to said output of said oscillator and a first and a second switchable output whereby said oscillator signal can be applied to either output according to a control signal applied to a control terminal of said pulse-former, a switch driver having an output coupled to said control terminal of said pulse-former and operative to selectively switch said output of said pulse-former between said first and second outputs to provide at said first output a pulse comprising a number of said oscillator cycles indicative of a desired pulse to pulse interval and selected according to a range gated time delay, a bi-phase modulator having an input coupled to said first output of said pulse-former to provide at an output a bi-phase modulated signal, a phase shifter having an input coupled to said output of said bi-phase modulator to provide a phase shifted signal at an output, with said output of said phase shifter coupled to the local oscillator input port of said first voltage multiplier, with said output of said bi-phase modulator coupled directly to said local oscillator input port of said second voltage multiplier, said output port of said first modulator providing a quadrature output (Q) signal and said output port of said second voltage multiplier providing an in-phase (I) output signal, an autocorrelator responsive to said I and Q signals from said voltage multipliers to process said signals for providing a detection signal indicative of the presence and distance of said object. - View Dependent Claims (8)
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9. A radar based sensor detection system, comprising:
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a microwave source operative to provide a continuous wave signal at an output, a pulse-former coupled to said output of said source and operative to provide at an output a variable length pulse that increases the transmitted energy of said radar system according to the range of object detection, a modulator coupled to said output of said pulse-former for providing a modulated pulse signal at an output, a transmit receive switch coupled to the output of said modulator and selectively operative between a first transmit position and a second receive position, a transmit channel coupled to said transmit receive switch for transmitting said pulse signal when said switch is operated in said transmit position, a receiving channel coupled to said transmit receive switch for receiving said modulator signal when said switch is operated in said receive position, first and second voltage multipliers each having a local oscillator input for receiving said modulator signal in said receive position and each having an input signal port, and an output port, a receiver channel for receiving a reflected transmitted signal from an output and applying said received signal to said receive signal input ports of said voltage multipliers, an autocorrelator coupled to said output ports of said voltage multipliers for correlating said received signal to produce an output signal indicating the detection and position of said object. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification