# US 10,768,289 B2 · Pulsed radar system and method of operating a pulsed radar system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,768,289 B2 - Document ID: US10768289B2 - Status: Granted - Kind: B2 - Application number: 15/737,615 - Filed: 2015-06-18 - Published: 2018-06-07 - Granted: 2020-09-08 - Earliest claimed: 2015-06-18 - Assignees: Saab AB - Applicants: Saab AB - Inventors: Anders Silander - Web page: https://patentgrep.com/patent/US10768289B2 ## CPC - G01S 13/30: using more than one pulse per radar period - G01S 7/034: {Duplexers (switching devices for waveguides H01P1/10; transmit-receive switching in transceivers H04B1/44)} - G01S 13/106: {using transmission of pulses having some particular characteristics (G01S13/12, G01S13/22, G01S13/24, G01S13/26, G01S13/28 and G01S13/30 take precedence)} - G01S 13/286: {frequency shift keyed} - G01S 7/282: Transmitters - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract The invention relates to a method for operating a pulsed radar system, wherein the pulsed radar system comprises a transmitting antenna, configured to transmit transmission signals, a receiving antenna, configured to receive reflected signals and a signal generating means, configured to generate transmission signals. The method comprises the steps of generating a first transmission signal at a first centre frequency, generating a second transmission signal at a second centre frequency and transmitting the first and the second transmission signals during a predefined transmission time window. The first transmission signal is significantly longer than the second transmission signal. The transmission of the second transmission signal starts during or at the end of the transmission of the first transmission signal and ends essentially at the end of the transmission time window. When the first and/or second transmission signal hits a target a first reflected signal and/or a second reflected signal is generated, wherein the centre frequency of the first reflected signal correlate to the centre frequency of the first transmission signal and the centre frequency of the second reflected signal correlate to the centre frequency of the second transmission signal, and wherein the method further comprises the method step of receiving the first and/or second reflected signal. ## Claims ### Claim 1 A method for operating a pulsed radar system, wherein the pulsed radar system comprises: a transmitting antenna, configured to transmit transmission signals, a receiving antenna, configured to receive reflected signals, a signal generating means, configured to generate transmission signals, and wherein the method comprises the steps of: generating a first transmission signal at a first centre frequency, generating a second transmission signal at a second centre frequency, wherein the first centre frequency differs from the second centre frequency, and transmitting the first and the second signal during a predefined transmission time window, wherein the transmission time window extends from a start time t0 to an end time tmax, and wherein transmission of the first transmission signal is performed between the start time t0 and the end time tmax, and wherein transmission of the second transmission signal is performed during a first predefined period of time starting after the start time t0 and ending at the end time tmax, whereby the transmission of the first transmission signal and the transmission of the second transmission signal ends at the same time, wherein when the first transmission signal hits a target a first reflected signal is generated and when the second transmission signal hits a target a second reflected signal is generated, wherein the centre frequency of the first reflected signal correlate to the centre frequency of the first transmission signal and the centre frequency of the second reflected signal correlate to the centre frequency of the second transmission signal, and wherein the method further comprises the method steps of: receiving the first and/or second reflected signal, and separating the first and second reflected signals by means of their respective first and second centre frequency. ### Claim 2 (depends on 1) A method of operating a pulsed radar system according to claim 1, wherein the pulsed radar system additionally comprises a first and a second signal filter means, wherein a first signal filter means is matched to the first centre frequency and a second signal filter means is matched to the second centre frequency, wherein the first and second signal filter means are used to separate the first reflected signal from the second reflected signal by means of respective centre frequency. ### Claim 3 (depends on 1) A method for operating a pulsed radar system according to claim 1, wherein the second centre frequency is higher than the first centre frequency. ### Claim 4 (depends on 1) A pulsed radar system configured for transmitting and receiving pulsed radar signals comprising: a transmitting antenna, configured to transmit transmission signals, a receiving antenna, configured to receive reflected signals, and a signal generating means, configured to generate transmission signals, the pulsed radar system is operated by a method according to claim 1. ### Claim 5 (depends on 4) A pulsed radar system for transmitting and receiving pulsed radar signals according to claim 4, and wherein the pulsed radar system further comprises at least one: signal processing means, wherein the at least one signal processing means is configured to process received reflected signals. ### Claim 6 (depends on 4) A pulsed radar system for transmitting and receiving pulsed radar signals according to claim 4, wherein the transmitting antenna and the receiving antenna is the same antenna, and wherein the pulsed radar system yet further comprises: a duplexer, wherein the duplexer is arranged between the antenna and the signal generating means and between the antenna and the signal processing means, and wherein the duplexer is configured to be switchable between a transmission mode and a reception mode, and wherein the duplexer, when set in transmission mode: is configured to direct a transmission signal generated at the signal generating means to the antenna, for transmission by the antenna, and when set in reception mode: is configured to direct a reflected signal, received by the antenna, from the antenna to the signal processing means. ### Claim 7 (depends on 1) A non-transitory computer device readable medium carrying a program comprising program code for performing the method steps of claim 1 when the program is run on a computer device. ### Claim 8 (depends on 1) A control unit for controlling a method for operating a pulsed radar system, the control unit being configured to perform the method steps of the method according to claim 1.