TH4313B - Radar system operating in two frequency bands - Google Patents

Abstract

Radar systems for tracking low-level targets consist of first and second radar devices (7 and 50). Both devices operate at their own frequency, but use one and the same tracking antenna (1) the target being tracked in the range and The angle coordinates provided by the first (7) radar device can be tracked in the corner coordinates by the second radar device (50) and in the range by the first (7) radar device when the target arrives within the second radar device range (50). A better system numerical model was obtained using a coprocessor that included a matching filter circuit (91-98).

Claims (4)

1. a radar system that can automatically track targets that are low enough to produce resonance, which is reflected by the earth's surface. The radar system consists of a) an antenna system suitable for operation in the first and second frequency bands. The first frequency band corresponding to the long wavelength is very suitable. Than for long-range angular tracking And a second frequency band corresponding to the shorter wavelength is more suitable for short-range angular tracking; b) the directional direction of the antenna system for effective target tracking; c) the first radar device electrically coupled to the antenna system. And it works in the first frequency band to make angular tracing a long-range result. The first radar device that combines the first receiver to produce a signal showing the range and direction of the long-range target; d) a second radar device that is electrically coupled to the antenna system. And it works in the second frequency band to make angular tracing a near-range effect. Such a second radar device incorporates a second receiver to produce a signal that shows at least the near-range target's direction; e) the signal processing path to derive from the signal produced by the first radar device. One for long-distance targets and news of target range information. Such signal processing paths are also obtained from the signals produced by the second radar device. Line direction error signal Second air for near-range targets; g) a control path connected to the first and second radar equipment with signal processing paths and antenna directional control methods. Such a control path affects the timing of pulse transmission by the first and second radar devices, affects the use of switching from the first and second radar devices to the signal processing strategies, and affects the transmission of the pulse. Controls the direction of long-range and close targets in response to the first and second antenna direction error signals, respectively. 2. Radar systems according to claim 1, where signal processing strategies consist of: a) a number of sensitive phase detectors for detecting alternating phases of differential level signals. And the combined signal produced by the first and second radar equipment; and b) a matching filter that is electrically connected to the sensitivity detector for Detected phase signal Phase error indication value Value indication range error And total signal value 3. Radar system according to claim 2, where the filters fit together as a group of serial components, including a) an analog-digital converter circuit that is electrically connected to the sensitive phase detector. To produce a numerical signal; b) an electrically connected to analog-digital converter circuit to passively pass numeric signals in response to a signal from a control method; c) a buffer memory. The first place to keep the selected numeric signal that was correct. Through a range gate circuit and d) an amplitude generator to find the maximum total signal from that value corresponding to the set pulse transmitted by its radar device, where the combined signal is Built from it 4. Radar system according to claim 3, where the amplitude generator consists of a. The counting method is electrically connected to the first buffer memory to add sequentially, and then subtract the individual sample signal values. B) a second buffer memory to store, respectively, one of the total signal values stored first, and c) a comparator with one input, and The second is electrically connected to the output channel by a sequence of counter methods and the second buffer memory. And that has an output that is electrically connected to the input of the second buffer memory, the comparator selected for the pass to the second buffer memory. Received by counter tactics which is greater than the total signal value currently stored in that buffer memory.