Harxon Corporation

Shiwei Wu

Jie Zhang

Haijun Zhang

Wenping Wu

Juanjuan Xu

Xiaohui Wang

Xiaoming Yin

Guanghui Huang

A quadrifilar helical antenna includes a conical supporting medium, a feed network, and four sets of antenna composite elements. Each set of antenna composite element includes at least one short-circuit helical arm and at least one open-circuit helical arm. The short-circuit helical arm and the open-circuit helical arm in each set of antenna composite element are sequentially wound on an outer wall of the conical supporting medium in one winding direction. In an axial direction of the conical supporting medium, a projection length of the short-circuit helical arm is greater than that of the open-circuit helical arm in each set of antenna composite element. The four sets of antenna composite elements are respectively coupled to a feeding point of the feed network for feeding, and the short-circuit helical arms in the four sets of antenna composite elements are in short-circuit connection. The antenna provided by embodiments of the present disclosure can efficiently improve the gain and gain bandwidth of the antenna under the condition that total occupation space is limited.

Quadrifilar helical antenna

The present disclosure provides a method and device for frequency hopping synchronization, a receiver, and a transmitter. The method comprises: when a synchronous frame, which is sent by the transmitter and comprises a transmitter frequency hopping starting count value corresponding to a preset clock, is received, determining a first count value, corresponding to the preset clock, of the received synchronous frame; acquiring the transmitter frequency hopping starting count value, corresponding to the preset clock, in the synchronous frame and the number of relevant transmission bytes of the synchronous frame; based on the received first count value and the received number of relevant transmission bytes of the synchronous frame, determining a predicted transmitter frequency hopping count value corresponding to the preset clock; and based on the predicted transmitter frequency hopping count value and the transmitter frequency hopping starting count value, determining a receiver frequency hopping starting count value. By applying the present technical solution, the frequency hopping of the receiver can be synchronized with the frequency hopping of the transmitter according to the receiver frequency hopping starting count value, and the precision of frequency hopping synchronization is greatly improved as the frequency hopping synchronization is implemented by controlling the receiver frequency hopping starting count value.

Method and device for frequency hopping synchronization, receiver and transmitter

Disclosed is an antenna mounting base and an antenna, the antenna mounting base comprising: an antenna substrate, a fixing plate and an annular reflective plate, wherein the antenna substrate is of a bowl-shaped structure, and an edge of an opening of the bowl-shaped structure is fixed to the fixing plate; the annular reflective plate stands on the fixing plate and is fixed to the fixing plate; the annular reflective plate and the antenna substrate are located on the same side of the fixing plate; and a feed support base is provided inside the bowl-shaped structure. In comparison with existing product technology, this antenna is simple to assemble, and has stronger structural consistency, and furthermore, the low pitch angle gain of the antenna is higher.

Antenna mounting base and antenna

A method for TDMA slot synchronization and calibration of a master and a slave includes: receiving a synchronizing frame from the master by the slave, wherein the synchronizing frame includes a first count value of a timing counter of the master; analysing the synchronizing frame by the slave to acquire the first count value; and adjusting a TDMA slot of the slave according to the first count value and a second count value of a timing counter of the slave to synchronize the TDMA slot of the slave with a TDMA slot of the master.

Method and apparatus for TDMA slot synchronization and calibration of master and slave

The present disclosure provides a method for controlling frequency hopping, a transmitter and a receiver, the method comprising: switching a synchronization frequency to any pre-configured synchronization frequency value when a time slot for sending a synchronization frame is reached, and sending the synchronization frame; after the previous synchronization frame is sent, switching the synchronization frequency from the previous pre-configured synchronization frequency value to any pre-configured synchronization frequency value, and sending the synchronization frame; after a total time slot for sending a synchronization frame is complete, switching a data frequency to any pre-configured data frequency value, and sending the data frame when the time slot for sending a data frame is reached; or, receiving a data frame when a time slot for receiving a data frame is reached; after the previous data frame is sent or received, and sending a data frame, switching the data frequency from a previous pre-configured data frequency value to any pre-configured frequency value; or, receiving the data frame. By applying the technical solution of the present disclosure, the operating state of a frequency hopping system may be accurately controlled, thereby improving the controllability of the frequency hopping system.

Method and device for controlling frequency hopping, transmitter and receiver

A multifunctional GNSS antenna includes a PCB and first and second dielectric plates arranged in a stacked manner. The PCB has a lower surface with a circuit network, which is covered by a metal shield cover. The first dielectric plate has an upper surface with a first metal layer and a lower surface attached to an upper surface of the PCB. A first feed probe penetrates the first metal layer and the first dielectric plate and is coupled with the circuit network. A third metal layer is embedded in an edge and a lateral surface of the first dielectric plate, and is coupled by a third feed probe with the circuit network while a first short-circuit probe shorts the third metal layer to ground. The second dielectric plate has an upper surface with a second metal layer coupled by a second feed probe with the circuit network.

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Guangdong, China

Shiwei Wu